libcamera: geometry: Rename Rectangle's top-left corner

21346 diff mbox series

The libcamera::Rectangle class should allow defining rectangles
regardless of the reference system where an instance is used in.

However the class documentation assumes the reference system origin
point to be in the visual top-left side and that rectangles are
constructed by specifying the top-left corner position and sizes.

However this is ambiguous when using a different reference system as,
in example, constructing a rectangle (x, y, w, h) in the following
scenario, with the origin corner in the top-left position, would require
a negative decrement along the y-axis.

         ^
         |
        y|      o------------------
         |      |                 | h
         |      |                 |
         |      -------------------
         |               w
          ------------------------------->
         (0,0)  x

To remove ambiguities, drop references to the visual top-left corner and
define the rectangle's origin corner as the corner closer to the
reference system origin point, and specify the horizontal and vertical
dimensions always increment along their respective axis, as in the
following example.

         ^
         |
         |      -------------------
         |      ^                 | h
         |      |                 |
        y|      o---->-------------
         |               w
          ------------------------------->
         (0,0)  x

         (0,0)  x
           ------------------------------>
          |              w
         y|     o---->-------------
          |     |                 | h
          |     v                 |
          |     -------------------
          |
          V

Also rename for consistency the Rectangle::topLeft() function to
Rectangle::origin() and update its in-tree users.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 include/libcamera/geometry.h                  |  2 +-
 src/ipa/ipu3/algorithms/af.cpp                |  2 +-
 src/libcamera/geometry.cpp                    | 85 ++++++++++++++-----
 .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
 src/py/libcamera/py_geometry.cpp              |  2 +-
 test/geometry.cpp                             |  8 +-
 6 files changed, 75 insertions(+), 28 deletions(-)

--
2.46.1

Hi Jacopo

Thank you for the patch

On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> The libcamera::Rectangle class should allow defining rectangles
> regardless of the reference system where an instance is used in.
>
> However the class documentation assumes the reference system origin
> point to be in the visual top-left side and that rectangles are
> constructed by specifying the top-left corner position and sizes.
>
> However this is ambiguous when using a different reference system as,
> in example, constructing a rectangle (x, y, w, h) in the following
> scenario, with the origin corner in the top-left position, would require
> a negative decrement along the y-axis.
>
>           ^
>           |
>          y|      o------------------
>           |      |                 | h
>           |      |                 |
>           |      -------------------
>           |               w
>            ------------------------------->
>           (0,0)  x
>
> To remove ambiguities, drop references to the visual top-left corner and
> define the rectangle's origin corner as the corner closer to the
> reference system origin point, and specify the horizontal and vertical
> dimensions always increment along their respective axis, as in the
> following example.
>
>           ^
>           |
>           |      -------------------
>           |      ^                 | h
>           |      |                 |
>          y|      o---->-------------
>           |               w
>            ------------------------------->
>           (0,0)  x
>
>           (0,0)  x
>             ------------------------------>
>            |              w
>           y|     o---->-------------
>            |     |                 | h
>            |     v                 |
>            |     -------------------
>            |
>            V
>
> Also rename for consistency the Rectangle::topLeft() function to
> Rectangle::origin() and update its in-tree users.
>
> Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> ---
>   include/libcamera/geometry.h                  |  2 +-
>   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
>   src/libcamera/geometry.cpp                    | 85 ++++++++++++++-----
>   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
>   src/py/libcamera/py_geometry.cpp              |  2 +-
>   test/geometry.cpp                             |  8 +-
>   6 files changed, 75 insertions(+), 28 deletions(-)
>
> diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
> index 3e6f0f5d7fab..07cb0a7866fe 100644
> --- a/include/libcamera/geometry.h
> +++ b/include/libcamera/geometry.h
> @@ -277,7 +277,7 @@ public:
>   		return { width, height };
>   	}
>
> -	Point topLeft() const
> +	Point origin() const
>   	{
>   		return { x, y };
>   	}
> diff --git a/src/ipa/ipu3/algorithms/af.cpp b/src/ipa/ipu3/algorithms/af.cpp
> index cf68fb59c49b..1b707e9dd9ab 100644
> --- a/src/ipa/ipu3/algorithms/af.cpp
> +++ b/src/ipa/ipu3/algorithms/af.cpp
> @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const IPAConfigInfo &configInfo)
>   	 * - Return the AF ROI as metadata in the Request
>   	 */
>   	Rectangle roi = gridSize.centeredTo(bds.center());
> -	Point start = roi.topLeft();
> +	Point start = roi.origin();
>
>   	/* x_start and y_start should be even */
>   	grid.x_start = utils::alignDown(start.x, 2);
> diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
> index 000151364c7f..45ba81a99920 100644
> --- a/src/libcamera/geometry.cpp
> +++ b/src/libcamera/geometry.cpp
> @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
>    * \brief Describe a rectangle's position and dimensions
>    *
>    * Rectangles are used to identify an area of an image. They are specified by
> - * the coordinates of top-left corner and their horizontal and vertical size.
> + * the coordinates of the corner closer to the reference system's origin point
> + * and by horizontal and vertical increments from there.
>    *
> - * The measure unit of the rectangle coordinates and size, as well as the
> - * reference point from which the Rectangle::x and Rectangle::y displacements
> - * refers to, are defined by the context were rectangle is used.
> + * The corner closer to the reference system's origin point is the rectangle's
> + * origin corner.
> + *
> + * \verbatim
> +
> +  o = origin corner
> +
> +         ^
> +         |
> +         |      -------------------
> +         |      ^                 |
> +         |      |                 |
> +         |      o---->-------------
> +         |
> +          ------------------------------->
> +         (0,0)
> +
> +         (0,0)
> +           ------------------------------->
> +          |
> +          |      o---->-------------
> +          |      |                 |
> +          |      v                 |
> +          |      -------------------
> +          |
> +          V
> +   \endverbatim
> + *
> + * The measure unit of the rectangle coordinates and size are defined by the
> + * context were the rectangle is used.
>    */
>
>   /**
> @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
>   /**
>    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
>    * \brief Construct a Rectangle with the given position and size
> - * \param[in] x The horizontal coordinate of the top-left corner
> - * \param[in] y The vertical coordinate of the top-left corner
> + * \param[in] x The horizontal coordinate of the origin corner
> + * \param[in] y The vertical coordinate of the origin corner
>    * \param[in] size The size
> + *
> + * The rectangle's origin corner is the corner closer to the reference system
> + * origin point (0, 0).
>    */
>
>   /**
>    * \fn Rectangle::Rectangle(int x, int y, unsigned int width, unsigned int height)
>    * \brief Construct a Rectangle with the given position and size
> - * \param[in] x The horizontal coordinate of the top-left corner
> - * \param[in] y The vertical coordinate of the top-left corner
> + * \param[in] x The horizontal coordinate of the origin corner
> + * \param[in] y The vertical coordinate of the origin corner
>    * \param[in] width The width
>    * \param[in] height The height
> + *
> + * The rectangle's origin corner is the corner closer to the reference system
> + * origin point (0, 0).
>    */
>
>   /**
>    * \fn Rectangle::Rectangle(const Size &size)
> - * \brief Construct a Rectangle of \a size with its top left corner located
> + * \brief Construct a Rectangle of \a size with its origin corner located
>    * at (0,0)
>    * \param[in] size The desired Rectangle size
> + *
> + * The rectangle's origin corner is the corner closer to the reference system
> + * origin point (0, 0).
>    */
>
>   /**
>    * \var Rectangle::x
> - * \brief The horizontal coordinate of the rectangle's top-left corner
> + * \brief The horizontal coordinate of the rectangle's origin corner
> + *
> + * The rectangle's origin corner is the corner closer to the reference system
> + * origin point (0, 0).
>    */
>
>   /**
>    * \var Rectangle::y
> - * \brief The vertical coordinate of the rectangle's top-left corner
> + * \brief The vertical coordinate of the rectangle's origin corner
> + *
> + * The rectangle's origin corner is the corner closer to the reference system
> + * origin point (0, 0).
>    */
>
>   /**
> @@ -683,9 +726,13 @@ Point Rectangle::center() const
>    */
>
>   /**
> - * \fn Point Rectangle::topLeft() const
> - * \brief Retrieve the coordinates of the top left corner of this Rectangle
> - * \return The Rectangle's top left corner
> + * \fn Point Rectangle::origin() const
> + * \brief Retrieve the coordinates of the origin corner of this Rectangle
> + *
> + * The rectangle's origin corner is the corner closer to the reference system
> + * origin point (0, 0).
> + *
> + * \return The Rectangle's origin corner

I think you can drop "corner" from "origin corner"

Probably throughout the patch:
     s/origin corner/origin/

Otherwise, LGTM

Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
>    */
>
>   /**
> @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const Point &point)
>    */
>   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
>   {
> -	int topLeftX = std::max(x, bound.x);
> -	int topLeftY = std::max(y, bound.y);
> +	int originX = std::max(x, bound.x);
> +	int originY = std::max(y, bound.y);
>   	int bottomRightX = std::min<int>(x + width, bound.x + bound.width);
>   	int bottomRightY = std::min<int>(y + height, bound.y + bound.height);
>
> -	unsigned int newWidth = std::max(bottomRightX - topLeftX, 0);
> -	unsigned int newHeight = std::max(bottomRightY - topLeftY, 0);
> +	unsigned int newWidth = std::max(bottomRightX - originX, 0);
> +	unsigned int newHeight = std::max(bottomRightY - originY, 0);
>
> -	return { topLeftX, topLeftY, newWidth, newHeight };
> +	return { originX, originY, newWidth, newHeight };
>   }
>
>   /**
> diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> index 3041fd1ed9fd..8d2440026689 100644
> --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const Rectangle &ispCrop) const
>   	 */
>   	Rectangle nativeCrop = ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
>   						sensorInfo_.outputSize);
> -	nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> +	nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
>   	return nativeCrop;
>   }
>
> @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const ControlList &controls)
>   			nativeCrop = { 0, 0, 1, 1 };
>
>   		/* Create a version of the crop scaled to ISP (camera mode) pixels. */
> -		Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> +		Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
>   		ispCrop.scaleBy(sensorInfo_.outputSize, sensorInfo_.analogCrop.size());
>
>   		/*
> diff --git a/src/py/libcamera/py_geometry.cpp b/src/py/libcamera/py_geometry.cpp
> index c7e303609427..8dee365b25dd 100644
> --- a/src/py/libcamera/py_geometry.cpp
> +++ b/src/py/libcamera/py_geometry.cpp
> @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
>   		.def_property_readonly("is_null", &Rectangle::isNull)
>   		.def_property_readonly("center", &Rectangle::center)
>   		.def_property_readonly("size", &Rectangle::size)
> -		.def_property_readonly("topLeft", &Rectangle::topLeft)
> +		.def_property_readonly("origin", &Rectangle::origin)
>   		.def("scale_by", &Rectangle::scaleBy)
>   		.def("translate_by", &Rectangle::translateBy)
>   		.def("bounded_to", &Rectangle::boundedTo)
> diff --git a/test/geometry.cpp b/test/geometry.cpp
> index 64169206ad16..a4ee6f6e167a 100644
> --- a/test/geometry.cpp
> +++ b/test/geometry.cpp
> @@ -363,16 +363,16 @@ protected:
>   			return TestFail;
>   		}
>
> -		/* Rectangle::size(), Rectangle::topLeft() and Rectangle::center() tests */
> +		/* Rectangle::size(), Rectangle::origin() and Rectangle::center() tests */
>   		if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
>   		    Rectangle(0, 0, 100000, 200000).size() != Size(100000, 200000)) {
>   			cout << "Rectangle::size() test failed" << endl;
>   			return TestFail;
>   		}
>
> -		if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2) ||
> -		    Rectangle(-1, -2, 3, 4).topLeft() != Point(-1, -2)) {
> -			cout << "Rectangle::topLeft() test failed" << endl;
> +		if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2) ||
> +		    Rectangle(-1, -2, 3, 4).origin() != Point(-1, -2)) {
> +			cout << "Rectangle::origin() test failed" << endl;
>   			return TestFail;
>   		}
>
> --
> 2.46.1
>

Hi Jacopo,

Thank you for the patch.

On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <umang.jain@ideasonboard.com> wrote:
>
> Hi Jacopo
>
> Thank you for the patch
>
> On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > The libcamera::Rectangle class should allow defining rectangles
> > regardless of the reference system where an instance is used in.
> >
> > However the class documentation assumes the reference system origin
> > point to be in the visual top-left side and that rectangles are
> > constructed by specifying the top-left corner position and sizes.
> >
> > However this is ambiguous when using a different reference system as,
> > in example, constructing a rectangle (x, y, w, h) in the following
> > scenario, with the origin corner in the top-left position, would require
> > a negative decrement along the y-axis.
> >
> >           ^
> >           |
> >          y|      o------------------
> >           |      |                 | h
> >           |      |                 |
> >           |      -------------------
> >           |               w
> >            ------------------------------->
> >           (0,0)  x
> >
> > To remove ambiguities, drop references to the visual top-left corner and
> > define the rectangle's origin corner as the corner closer to the
> > reference system origin point, and specify the horizontal and vertical
> > dimensions always increment along their respective axis, as in the
> > following example.
> >
> >           ^
> >           |
> >           |      -------------------
> >           |      ^                 | h
> >           |      |                 |
> >          y|      o---->-------------
> >           |               w
> >            ------------------------------->
> >           (0,0)  x
> >
> >           (0,0)  x
> >             ------------------------------>
> >            |              w
> >           y|     o---->-------------
> >            |     |                 | h
> >            |     v                 |
> >            |     -------------------
> >            |
> >            V
> >
> > Also rename for consistency the Rectangle::topLeft() function to
> > Rectangle::origin() and update its in-tree users.
> >
> > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > ---
> >   include/libcamera/geometry.h                  |  2 +-
> >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> >   src/libcamera/geometry.cpp                    | 85 ++++++++++++++-----
> >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> >   src/py/libcamera/py_geometry.cpp              |  2 +-
> >   test/geometry.cpp                             |  8 +-
> >   6 files changed, 75 insertions(+), 28 deletions(-)
> >
> > diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
> > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > --- a/include/libcamera/geometry.h
> > +++ b/include/libcamera/geometry.h
> > @@ -277,7 +277,7 @@ public:
> >               return { width, height };
> >       }
> >
> > -     Point topLeft() const
> > +     Point origin() const
> >       {
> >               return { x, y };
> >       }
> > diff --git a/src/ipa/ipu3/algorithms/af.cpp b/src/ipa/ipu3/algorithms/af.cpp
> > index cf68fb59c49b..1b707e9dd9ab 100644
> > --- a/src/ipa/ipu3/algorithms/af.cpp
> > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const IPAConfigInfo &configInfo)
> >        * - Return the AF ROI as metadata in the Request
> >        */
> >       Rectangle roi = gridSize.centeredTo(bds.center());
> > -     Point start = roi.topLeft();
> > +     Point start = roi.origin();
> >
> >       /* x_start and y_start should be even */
> >       grid.x_start = utils::alignDown(start.x, 2);
> > diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
> > index 000151364c7f..45ba81a99920 100644
> > --- a/src/libcamera/geometry.cpp
> > +++ b/src/libcamera/geometry.cpp
> > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
> >    * \brief Describe a rectangle's position and dimensions
> >    *
> >    * Rectangles are used to identify an area of an image. They are specified by
> > - * the coordinates of top-left corner and their horizontal and vertical size.
> > + * the coordinates of the corner closer to the reference system's origin point
> > + * and by horizontal and vertical increments from there.
> >    *
> > - * The measure unit of the rectangle coordinates and size, as well as the
> > - * reference point from which the Rectangle::x and Rectangle::y displacements
> > - * refers to, are defined by the context were rectangle is used.
> > + * The corner closer to the reference system's origin point is the rectangle's
> > + * origin corner.
> > + *
> > + * \verbatim
> > +
> > +  o = origin corner
> > +
> > +         ^
> > +         |
> > +         |      -------------------
> > +         |      ^                 |
> > +         |      |                 |
> > +         |      o---->-------------
> > +         |
> > +          ------------------------------->
> > +         (0,0)
> > +
> > +         (0,0)
> > +           ------------------------------->
> > +          |
> > +          |      o---->-------------
> > +          |      |                 |
> > +          |      v                 |
> > +          |      -------------------
> > +          |
> > +          V
> > +   \endverbatim
> > + *
> > + * The measure unit of the rectangle coordinates and size are defined by the
> > + * context were the rectangle is used.
> >    */
> >
> >   /**
> > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
> >   /**
> >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> >    * \brief Construct a Rectangle with the given position and size
> > - * \param[in] x The horizontal coordinate of the top-left corner
> > - * \param[in] y The vertical coordinate of the top-left corner
> > + * \param[in] x The horizontal coordinate of the origin corner
> > + * \param[in] y The vertical coordinate of the origin corner
> >    * \param[in] size The size
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).

I think we should stick to the previous description:
`"origin" point defined as the point with the lower x and
lower y of the rectangle`, as `x` and `y` are signed integers.

If we only support coordinates that are positive or 0, which
I'm not sure if it's the case, how about making the type to be
`unsigned int`?

BR,
Harvey


> >    */
> >
> >   /**
> >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width, unsigned int height)
> >    * \brief Construct a Rectangle with the given position and size
> > - * \param[in] x The horizontal coordinate of the top-left corner
> > - * \param[in] y The vertical coordinate of the top-left corner
> > + * \param[in] x The horizontal coordinate of the origin corner
> > + * \param[in] y The vertical coordinate of the origin corner
> >    * \param[in] width The width
> >    * \param[in] height The height
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> >    * \fn Rectangle::Rectangle(const Size &size)
> > - * \brief Construct a Rectangle of \a size with its top left corner located
> > + * \brief Construct a Rectangle of \a size with its origin corner located
> >    * at (0,0)
> >    * \param[in] size The desired Rectangle size
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> >    * \var Rectangle::x
> > - * \brief The horizontal coordinate of the rectangle's top-left corner
> > + * \brief The horizontal coordinate of the rectangle's origin corner
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> >    * \var Rectangle::y
> > - * \brief The vertical coordinate of the rectangle's top-left corner
> > + * \brief The vertical coordinate of the rectangle's origin corner
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> >    */
> >
> >   /**
> > - * \fn Point Rectangle::topLeft() const
> > - * \brief Retrieve the coordinates of the top left corner of this Rectangle
> > - * \return The Rectangle's top left corner
> > + * \fn Point Rectangle::origin() const
> > + * \brief Retrieve the coordinates of the origin corner of this Rectangle
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> > + *
> > + * \return The Rectangle's origin corner
>
> I think you can drop "corner" from "origin corner"
>
> Probably throughout the patch:
>      s/origin corner/origin/
>
> Otherwise, LGTM
>
> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> >    */
> >
> >   /**
> > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const Point &point)
> >    */
> >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> >   {
> > -     int topLeftX = std::max(x, bound.x);
> > -     int topLeftY = std::max(y, bound.y);
> > +     int originX = std::max(x, bound.x);
> > +     int originY = std::max(y, bound.y);
> >       int bottomRightX = std::min<int>(x + width, bound.x + bound.width);
> >       int bottomRightY = std::min<int>(y + height, bound.y + bound.height);
> >
> > -     unsigned int newWidth = std::max(bottomRightX - topLeftX, 0);
> > -     unsigned int newHeight = std::max(bottomRightY - topLeftY, 0);
> > +     unsigned int newWidth = std::max(bottomRightX - originX, 0);
> > +     unsigned int newHeight = std::max(bottomRightY - originY, 0);
> >
> > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > +     return { originX, originY, newWidth, newHeight };
> >   }
> >
> >   /**
> > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > index 3041fd1ed9fd..8d2440026689 100644
> > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const Rectangle &ispCrop) const
> >        */
> >       Rectangle nativeCrop = ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> >                                               sensorInfo_.outputSize);
> > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> >       return nativeCrop;
> >   }
> >
> > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const ControlList &controls)
> >                       nativeCrop = { 0, 0, 1, 1 };
> >
> >               /* Create a version of the crop scaled to ISP (camera mode) pixels. */
> > -             Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > +             Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> >               ispCrop.scaleBy(sensorInfo_.outputSize, sensorInfo_.analogCrop.size());
> >
> >               /*
> > diff --git a/src/py/libcamera/py_geometry.cpp b/src/py/libcamera/py_geometry.cpp
> > index c7e303609427..8dee365b25dd 100644
> > --- a/src/py/libcamera/py_geometry.cpp
> > +++ b/src/py/libcamera/py_geometry.cpp
> > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> >               .def_property_readonly("is_null", &Rectangle::isNull)
> >               .def_property_readonly("center", &Rectangle::center)
> >               .def_property_readonly("size", &Rectangle::size)
> > -             .def_property_readonly("topLeft", &Rectangle::topLeft)
> > +             .def_property_readonly("origin", &Rectangle::origin)
> >               .def("scale_by", &Rectangle::scaleBy)
> >               .def("translate_by", &Rectangle::translateBy)
> >               .def("bounded_to", &Rectangle::boundedTo)
> > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > index 64169206ad16..a4ee6f6e167a 100644
> > --- a/test/geometry.cpp
> > +++ b/test/geometry.cpp
> > @@ -363,16 +363,16 @@ protected:
> >                       return TestFail;
> >               }
> >
> > -             /* Rectangle::size(), Rectangle::topLeft() and Rectangle::center() tests */
> > +             /* Rectangle::size(), Rectangle::origin() and Rectangle::center() tests */
> >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> >                   Rectangle(0, 0, 100000, 200000).size() != Size(100000, 200000)) {
> >                       cout << "Rectangle::size() test failed" << endl;
> >                       return TestFail;
> >               }
> >
> > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2) ||
> > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1, -2)) {
> > -                     cout << "Rectangle::topLeft() test failed" << endl;
> > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2) ||
> > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1, -2)) {
> > +                     cout << "Rectangle::origin() test failed" << endl;
> >                       return TestFail;
> >               }
> >
> > --
> > 2.46.1
> >
>

Hi Umang

On Wed, Sep 25, 2024 at 12:06:05PM GMT, Umang Jain wrote:
> Hi Jacopo
>
> Thank you for the patch
>
> On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > The libcamera::Rectangle class should allow defining rectangles
> > regardless of the reference system where an instance is used in.
> >
> > However the class documentation assumes the reference system origin
> > point to be in the visual top-left side and that rectangles are
> > constructed by specifying the top-left corner position and sizes.
> >
> > However this is ambiguous when using a different reference system as,
> > in example, constructing a rectangle (x, y, w, h) in the following
> > scenario, with the origin corner in the top-left position, would require
> > a negative decrement along the y-axis.
> >
> >           ^
> >           |
> >          y|      o------------------
> >           |      |                 | h
> >           |      |                 |
> >           |      -------------------
> >           |               w
> >            ------------------------------->
> >           (0,0)  x
> >
> > To remove ambiguities, drop references to the visual top-left corner and
> > define the rectangle's origin corner as the corner closer to the
> > reference system origin point, and specify the horizontal and vertical
> > dimensions always increment along their respective axis, as in the
> > following example.
> >
> >           ^
> >           |
> >           |      -------------------
> >           |      ^                 | h
> >           |      |                 |
> >          y|      o---->-------------
> >           |               w
> >            ------------------------------->
> >           (0,0)  x
> >
> >           (0,0)  x
> >             ------------------------------>
> >            |              w
> >           y|     o---->-------------
> >            |     |                 | h
> >            |     v                 |
> >            |     -------------------
> >            |
> >            V
> >
> > Also rename for consistency the Rectangle::topLeft() function to
> > Rectangle::origin() and update its in-tree users.
> >
> > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > ---
> >   include/libcamera/geometry.h                  |  2 +-
> >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> >   src/libcamera/geometry.cpp                    | 85 ++++++++++++++-----
> >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> >   src/py/libcamera/py_geometry.cpp              |  2 +-
> >   test/geometry.cpp                             |  8 +-
> >   6 files changed, 75 insertions(+), 28 deletions(-)
> >
> > diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
> > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > --- a/include/libcamera/geometry.h
> > +++ b/include/libcamera/geometry.h
> > @@ -277,7 +277,7 @@ public:
> >   		return { width, height };
> >   	}
> >
> > -	Point topLeft() const
> > +	Point origin() const
> >   	{
> >   		return { x, y };
> >   	}
> > diff --git a/src/ipa/ipu3/algorithms/af.cpp b/src/ipa/ipu3/algorithms/af.cpp
> > index cf68fb59c49b..1b707e9dd9ab 100644
> > --- a/src/ipa/ipu3/algorithms/af.cpp
> > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const IPAConfigInfo &configInfo)
> >   	 * - Return the AF ROI as metadata in the Request
> >   	 */
> >   	Rectangle roi = gridSize.centeredTo(bds.center());
> > -	Point start = roi.topLeft();
> > +	Point start = roi.origin();
> >
> >   	/* x_start and y_start should be even */
> >   	grid.x_start = utils::alignDown(start.x, 2);
> > diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
> > index 000151364c7f..45ba81a99920 100644
> > --- a/src/libcamera/geometry.cpp
> > +++ b/src/libcamera/geometry.cpp
> > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
> >    * \brief Describe a rectangle's position and dimensions
> >    *
> >    * Rectangles are used to identify an area of an image. They are specified by
> > - * the coordinates of top-left corner and their horizontal and vertical size.
> > + * the coordinates of the corner closer to the reference system's origin point
> > + * and by horizontal and vertical increments from there.
> >    *
> > - * The measure unit of the rectangle coordinates and size, as well as the
> > - * reference point from which the Rectangle::x and Rectangle::y displacements
> > - * refers to, are defined by the context were rectangle is used.
> > + * The corner closer to the reference system's origin point is the rectangle's
> > + * origin corner.
> > + *
> > + * \verbatim
> > +
> > +  o = origin corner
> > +
> > +         ^
> > +         |
> > +         |      -------------------
> > +         |      ^                 |
> > +         |      |                 |
> > +         |      o---->-------------
> > +         |
> > +          ------------------------------->
> > +         (0,0)
> > +
> > +         (0,0)
> > +           ------------------------------->
> > +          |
> > +          |      o---->-------------
> > +          |      |                 |
> > +          |      v                 |
> > +          |      -------------------
> > +          |
> > +          V
> > +   \endverbatim
> > + *
> > + * The measure unit of the rectangle coordinates and size are defined by the
> > + * context were the rectangle is used.
> >    */
> >
> >   /**
> > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
> >   /**
> >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> >    * \brief Construct a Rectangle with the given position and size
> > - * \param[in] x The horizontal coordinate of the top-left corner
> > - * \param[in] y The vertical coordinate of the top-left corner
> > + * \param[in] x The horizontal coordinate of the origin corner
> > + * \param[in] y The vertical coordinate of the origin corner
> >    * \param[in] size The size
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width, unsigned int height)
> >    * \brief Construct a Rectangle with the given position and size
> > - * \param[in] x The horizontal coordinate of the top-left corner
> > - * \param[in] y The vertical coordinate of the top-left corner
> > + * \param[in] x The horizontal coordinate of the origin corner
> > + * \param[in] y The vertical coordinate of the origin corner
> >    * \param[in] width The width
> >    * \param[in] height The height
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> >    * \fn Rectangle::Rectangle(const Size &size)
> > - * \brief Construct a Rectangle of \a size with its top left corner located
> > + * \brief Construct a Rectangle of \a size with its origin corner located
> >    * at (0,0)
> >    * \param[in] size The desired Rectangle size
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> >    * \var Rectangle::x
> > - * \brief The horizontal coordinate of the rectangle's top-left corner
> > + * \brief The horizontal coordinate of the rectangle's origin corner
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> >    * \var Rectangle::y
> > - * \brief The vertical coordinate of the rectangle's top-left corner
> > + * \brief The vertical coordinate of the rectangle's origin corner
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> >    */
> >
> >   /**
> > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> >    */
> >
> >   /**
> > - * \fn Point Rectangle::topLeft() const
> > - * \brief Retrieve the coordinates of the top left corner of this Rectangle
> > - * \return The Rectangle's top left corner
> > + * \fn Point Rectangle::origin() const
> > + * \brief Retrieve the coordinates of the origin corner of this Rectangle
> > + *
> > + * The rectangle's origin corner is the corner closer to the reference system
> > + * origin point (0, 0).
> > + *
> > + * \return The Rectangle's origin corner
>
> I think you can drop "corner" from "origin corner"
>
> Probably throughout the patch:
>     s/origin corner/origin/
>

I considered that, but as a "rectangle origin" is not a well-defined
term in geometry I prefer to specify it's a corner. Is this ok ?

> Otherwise, LGTM
>
> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

Thanks
  j

> >    */
> >
> >   /**
> > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const Point &point)
> >    */
> >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> >   {
> > -	int topLeftX = std::max(x, bound.x);
> > -	int topLeftY = std::max(y, bound.y);
> > +	int originX = std::max(x, bound.x);
> > +	int originY = std::max(y, bound.y);
> >   	int bottomRightX = std::min<int>(x + width, bound.x + bound.width);
> >   	int bottomRightY = std::min<int>(y + height, bound.y + bound.height);
> >
> > -	unsigned int newWidth = std::max(bottomRightX - topLeftX, 0);
> > -	unsigned int newHeight = std::max(bottomRightY - topLeftY, 0);
> > +	unsigned int newWidth = std::max(bottomRightX - originX, 0);
> > +	unsigned int newHeight = std::max(bottomRightY - originY, 0);
> >
> > -	return { topLeftX, topLeftY, newWidth, newHeight };
> > +	return { originX, originY, newWidth, newHeight };
> >   }
> >
> >   /**
> > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > index 3041fd1ed9fd..8d2440026689 100644
> > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const Rectangle &ispCrop) const
> >   	 */
> >   	Rectangle nativeCrop = ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> >   						sensorInfo_.outputSize);
> > -	nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > +	nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> >   	return nativeCrop;
> >   }
> >
> > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const ControlList &controls)
> >   			nativeCrop = { 0, 0, 1, 1 };
> >
> >   		/* Create a version of the crop scaled to ISP (camera mode) pixels. */
> > -		Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > +		Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> >   		ispCrop.scaleBy(sensorInfo_.outputSize, sensorInfo_.analogCrop.size());
> >
> >   		/*
> > diff --git a/src/py/libcamera/py_geometry.cpp b/src/py/libcamera/py_geometry.cpp
> > index c7e303609427..8dee365b25dd 100644
> > --- a/src/py/libcamera/py_geometry.cpp
> > +++ b/src/py/libcamera/py_geometry.cpp
> > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> >   		.def_property_readonly("is_null", &Rectangle::isNull)
> >   		.def_property_readonly("center", &Rectangle::center)
> >   		.def_property_readonly("size", &Rectangle::size)
> > -		.def_property_readonly("topLeft", &Rectangle::topLeft)
> > +		.def_property_readonly("origin", &Rectangle::origin)
> >   		.def("scale_by", &Rectangle::scaleBy)
> >   		.def("translate_by", &Rectangle::translateBy)
> >   		.def("bounded_to", &Rectangle::boundedTo)
> > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > index 64169206ad16..a4ee6f6e167a 100644
> > --- a/test/geometry.cpp
> > +++ b/test/geometry.cpp
> > @@ -363,16 +363,16 @@ protected:
> >   			return TestFail;
> >   		}
> >
> > -		/* Rectangle::size(), Rectangle::topLeft() and Rectangle::center() tests */
> > +		/* Rectangle::size(), Rectangle::origin() and Rectangle::center() tests */
> >   		if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> >   		    Rectangle(0, 0, 100000, 200000).size() != Size(100000, 200000)) {
> >   			cout << "Rectangle::size() test failed" << endl;
> >   			return TestFail;
> >   		}
> >
> > -		if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2) ||
> > -		    Rectangle(-1, -2, 3, 4).topLeft() != Point(-1, -2)) {
> > -			cout << "Rectangle::topLeft() test failed" << endl;
> > +		if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2) ||
> > +		    Rectangle(-1, -2, 3, 4).origin() != Point(-1, -2)) {
> > +			cout << "Rectangle::origin() test failed" << endl;
> >   			return TestFail;
> >   		}
> >
> > --
> > 2.46.1
> >
>

Hi Harvey

On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <umang.jain@ideasonboard.com> wrote:
> >
> > Hi Jacopo
> >
> > Thank you for the patch
> >
> > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > The libcamera::Rectangle class should allow defining rectangles
> > > regardless of the reference system where an instance is used in.
> > >
> > > However the class documentation assumes the reference system origin
> > > point to be in the visual top-left side and that rectangles are
> > > constructed by specifying the top-left corner position and sizes.
> > >
> > > However this is ambiguous when using a different reference system as,
> > > in example, constructing a rectangle (x, y, w, h) in the following
> > > scenario, with the origin corner in the top-left position, would require
> > > a negative decrement along the y-axis.
> > >
> > >           ^
> > >           |
> > >          y|      o------------------
> > >           |      |                 | h
> > >           |      |                 |
> > >           |      -------------------
> > >           |               w
> > >            ------------------------------->
> > >           (0,0)  x
> > >
> > > To remove ambiguities, drop references to the visual top-left corner and
> > > define the rectangle's origin corner as the corner closer to the
> > > reference system origin point, and specify the horizontal and vertical
> > > dimensions always increment along their respective axis, as in the
> > > following example.
> > >
> > >           ^
> > >           |
> > >           |      -------------------
> > >           |      ^                 | h
> > >           |      |                 |
> > >          y|      o---->-------------
> > >           |               w
> > >            ------------------------------->
> > >           (0,0)  x
> > >
> > >           (0,0)  x
> > >             ------------------------------>
> > >            |              w
> > >           y|     o---->-------------
> > >            |     |                 | h
> > >            |     v                 |
> > >            |     -------------------
> > >            |
> > >            V
> > >
> > > Also rename for consistency the Rectangle::topLeft() function to
> > > Rectangle::origin() and update its in-tree users.
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > ---
> > >   include/libcamera/geometry.h                  |  2 +-
> > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > >   src/libcamera/geometry.cpp                    | 85 ++++++++++++++-----
> > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > >   test/geometry.cpp                             |  8 +-
> > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > >
> > > diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
> > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > --- a/include/libcamera/geometry.h
> > > +++ b/include/libcamera/geometry.h
> > > @@ -277,7 +277,7 @@ public:
> > >               return { width, height };
> > >       }
> > >
> > > -     Point topLeft() const
> > > +     Point origin() const
> > >       {
> > >               return { x, y };
> > >       }
> > > diff --git a/src/ipa/ipu3/algorithms/af.cpp b/src/ipa/ipu3/algorithms/af.cpp
> > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const IPAConfigInfo &configInfo)
> > >        * - Return the AF ROI as metadata in the Request
> > >        */
> > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > -     Point start = roi.topLeft();
> > > +     Point start = roi.origin();
> > >
> > >       /* x_start and y_start should be even */
> > >       grid.x_start = utils::alignDown(start.x, 2);
> > > diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
> > > index 000151364c7f..45ba81a99920 100644
> > > --- a/src/libcamera/geometry.cpp
> > > +++ b/src/libcamera/geometry.cpp
> > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
> > >    * \brief Describe a rectangle's position and dimensions
> > >    *
> > >    * Rectangles are used to identify an area of an image. They are specified by
> > > - * the coordinates of top-left corner and their horizontal and vertical size.
> > > + * the coordinates of the corner closer to the reference system's origin point
> > > + * and by horizontal and vertical increments from there.
> > >    *
> > > - * The measure unit of the rectangle coordinates and size, as well as the
> > > - * reference point from which the Rectangle::x and Rectangle::y displacements
> > > - * refers to, are defined by the context were rectangle is used.
> > > + * The corner closer to the reference system's origin point is the rectangle's
> > > + * origin corner.
> > > + *
> > > + * \verbatim
> > > +
> > > +  o = origin corner
> > > +
> > > +         ^
> > > +         |
> > > +         |      -------------------
> > > +         |      ^                 |
> > > +         |      |                 |
> > > +         |      o---->-------------
> > > +         |
> > > +          ------------------------------->
> > > +         (0,0)
> > > +
> > > +         (0,0)
> > > +           ------------------------------->
> > > +          |
> > > +          |      o---->-------------
> > > +          |      |                 |
> > > +          |      v                 |
> > > +          |      -------------------
> > > +          |
> > > +          V
> > > +   \endverbatim
> > > + *
> > > + * The measure unit of the rectangle coordinates and size are defined by the
> > > + * context were the rectangle is used.
> > >    */
> > >
> > >   /**
> > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
> > >   /**
> > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > >    * \brief Construct a Rectangle with the given position and size
> > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > - * \param[in] y The vertical coordinate of the top-left corner
> > > + * \param[in] x The horizontal coordinate of the origin corner
> > > + * \param[in] y The vertical coordinate of the origin corner
> > >    * \param[in] size The size
> > > + *
> > > + * The rectangle's origin corner is the corner closer to the reference system
> > > + * origin point (0, 0).
>
> I think we should stick to the previous description:
> `"origin" point defined as the point with the lower x and
> lower y of the rectangle`, as `x` and `y` are signed integers.
>
> If we only support coordinates that are positive or 0, which
> I'm not sure if it's the case, how about making the type to be
> `unsigned int`?
>

To be honest I would rather make width and heigh signed to allow
constructing (x, y, -w, -h)




               -------------------
               |                 ^
               |            ------------->
               |           |     |
               ------<-----|-----o
                           |
                           |
                           V

Not sure if it's useful or not though


> BR,
> Harvey
>
>
> > >    */
> > >
> > >   /**
> > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width, unsigned int height)
> > >    * \brief Construct a Rectangle with the given position and size
> > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > - * \param[in] y The vertical coordinate of the top-left corner
> > > + * \param[in] x The horizontal coordinate of the origin corner
> > > + * \param[in] y The vertical coordinate of the origin corner
> > >    * \param[in] width The width
> > >    * \param[in] height The height
> > > + *
> > > + * The rectangle's origin corner is the corner closer to the reference system
> > > + * origin point (0, 0).
> > >    */
> > >
> > >   /**
> > >    * \fn Rectangle::Rectangle(const Size &size)
> > > - * \brief Construct a Rectangle of \a size with its top left corner located
> > > + * \brief Construct a Rectangle of \a size with its origin corner located
> > >    * at (0,0)
> > >    * \param[in] size The desired Rectangle size
> > > + *
> > > + * The rectangle's origin corner is the corner closer to the reference system
> > > + * origin point (0, 0).
> > >    */
> > >
> > >   /**
> > >    * \var Rectangle::x
> > > - * \brief The horizontal coordinate of the rectangle's top-left corner
> > > + * \brief The horizontal coordinate of the rectangle's origin corner
> > > + *
> > > + * The rectangle's origin corner is the corner closer to the reference system
> > > + * origin point (0, 0).
> > >    */
> > >
> > >   /**
> > >    * \var Rectangle::y
> > > - * \brief The vertical coordinate of the rectangle's top-left corner
> > > + * \brief The vertical coordinate of the rectangle's origin corner
> > > + *
> > > + * The rectangle's origin corner is the corner closer to the reference system
> > > + * origin point (0, 0).
> > >    */
> > >
> > >   /**
> > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > >    */
> > >
> > >   /**
> > > - * \fn Point Rectangle::topLeft() const
> > > - * \brief Retrieve the coordinates of the top left corner of this Rectangle
> > > - * \return The Rectangle's top left corner
> > > + * \fn Point Rectangle::origin() const
> > > + * \brief Retrieve the coordinates of the origin corner of this Rectangle
> > > + *
> > > + * The rectangle's origin corner is the corner closer to the reference system
> > > + * origin point (0, 0).
> > > + *
> > > + * \return The Rectangle's origin corner
> >
> > I think you can drop "corner" from "origin corner"
> >
> > Probably throughout the patch:
> >      s/origin corner/origin/
> >
> > Otherwise, LGTM
> >
> > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > >    */
> > >
> > >   /**
> > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const Point &point)
> > >    */
> > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > >   {
> > > -     int topLeftX = std::max(x, bound.x);
> > > -     int topLeftY = std::max(y, bound.y);
> > > +     int originX = std::max(x, bound.x);
> > > +     int originY = std::max(y, bound.y);
> > >       int bottomRightX = std::min<int>(x + width, bound.x + bound.width);
> > >       int bottomRightY = std::min<int>(y + height, bound.y + bound.height);
> > >
> > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX, 0);
> > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY, 0);
> > > +     unsigned int newWidth = std::max(bottomRightX - originX, 0);
> > > +     unsigned int newHeight = std::max(bottomRightY - originY, 0);
> > >
> > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > +     return { originX, originY, newWidth, newHeight };
> > >   }
> > >
> > >   /**
> > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > index 3041fd1ed9fd..8d2440026689 100644
> > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const Rectangle &ispCrop) const
> > >        */
> > >       Rectangle nativeCrop = ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > >                                               sensorInfo_.outputSize);
> > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > >       return nativeCrop;
> > >   }
> > >
> > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const ControlList &controls)
> > >                       nativeCrop = { 0, 0, 1, 1 };
> > >
> > >               /* Create a version of the crop scaled to ISP (camera mode) pixels. */
> > > -             Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > +             Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > >               ispCrop.scaleBy(sensorInfo_.outputSize, sensorInfo_.analogCrop.size());
> > >
> > >               /*
> > > diff --git a/src/py/libcamera/py_geometry.cpp b/src/py/libcamera/py_geometry.cpp
> > > index c7e303609427..8dee365b25dd 100644
> > > --- a/src/py/libcamera/py_geometry.cpp
> > > +++ b/src/py/libcamera/py_geometry.cpp
> > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > >               .def_property_readonly("is_null", &Rectangle::isNull)
> > >               .def_property_readonly("center", &Rectangle::center)
> > >               .def_property_readonly("size", &Rectangle::size)
> > > -             .def_property_readonly("topLeft", &Rectangle::topLeft)
> > > +             .def_property_readonly("origin", &Rectangle::origin)
> > >               .def("scale_by", &Rectangle::scaleBy)
> > >               .def("translate_by", &Rectangle::translateBy)
> > >               .def("bounded_to", &Rectangle::boundedTo)
> > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > index 64169206ad16..a4ee6f6e167a 100644
> > > --- a/test/geometry.cpp
> > > +++ b/test/geometry.cpp
> > > @@ -363,16 +363,16 @@ protected:
> > >                       return TestFail;
> > >               }
> > >
> > > -             /* Rectangle::size(), Rectangle::topLeft() and Rectangle::center() tests */
> > > +             /* Rectangle::size(), Rectangle::origin() and Rectangle::center() tests */
> > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > >                   Rectangle(0, 0, 100000, 200000).size() != Size(100000, 200000)) {
> > >                       cout << "Rectangle::size() test failed" << endl;
> > >                       return TestFail;
> > >               }
> > >
> > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2) ||
> > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1, -2)) {
> > > -                     cout << "Rectangle::topLeft() test failed" << endl;
> > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2) ||
> > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1, -2)) {
> > > +                     cout << "Rectangle::origin() test failed" << endl;
> > >                       return TestFail;
> > >               }
> > >
> > > --
> > > 2.46.1
> > >
> >
>
>
> --
> BR,
> Harvey Yang

Hi Jacopo,

On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
wrote:

> Hi Harvey
>
> On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > Hi Jacopo,
> >
> > Thank you for the patch.
> >
> > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <umang.jain@ideasonboard.com>
> wrote:
> > >
> > > Hi Jacopo
> > >
> > > Thank you for the patch
> > >
> > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > The libcamera::Rectangle class should allow defining rectangles
> > > > regardless of the reference system where an instance is used in.
> > > >
> > > > However the class documentation assumes the reference system origin
> > > > point to be in the visual top-left side and that rectangles are
> > > > constructed by specifying the top-left corner position and sizes.
> > > >
> > > > However this is ambiguous when using a different reference system as,
> > > > in example, constructing a rectangle (x, y, w, h) in the following
> > > > scenario, with the origin corner in the top-left position, would
> require
> > > > a negative decrement along the y-axis.
> > > >
> > > >           ^
> > > >           |
> > > >          y|      o------------------
> > > >           |      |                 | h
> > > >           |      |                 |
> > > >           |      -------------------
> > > >           |               w
> > > >            ------------------------------->
> > > >           (0,0)  x
> > > >
> > > > To remove ambiguities, drop references to the visual top-left corner
> and
> > > > define the rectangle's origin corner as the corner closer to the
> > > > reference system origin point, and specify the horizontal and
> vertical
> > > > dimensions always increment along their respective axis, as in the
> > > > following example.
> > > >
> > > >           ^
> > > >           |
> > > >           |      -------------------
> > > >           |      ^                 | h
> > > >           |      |                 |
> > > >          y|      o---->-------------
> > > >           |               w
> > > >            ------------------------------->
> > > >           (0,0)  x
> > > >
> > > >           (0,0)  x
> > > >             ------------------------------>
> > > >            |              w
> > > >           y|     o---->-------------
> > > >            |     |                 | h
> > > >            |     v                 |
> > > >            |     -------------------
> > > >            |
> > > >            V
> > > >
> > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > Rectangle::origin() and update its in-tree users.
> > > >
> > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > ---
> > > >   include/libcamera/geometry.h                  |  2 +-
> > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > >   src/libcamera/geometry.cpp                    | 85
> ++++++++++++++-----
> > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > >   test/geometry.cpp                             |  8 +-
> > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > >
> > > > diff --git a/include/libcamera/geometry.h
> b/include/libcamera/geometry.h
> > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > --- a/include/libcamera/geometry.h
> > > > +++ b/include/libcamera/geometry.h
> > > > @@ -277,7 +277,7 @@ public:
> > > >               return { width, height };
> > > >       }
> > > >
> > > > -     Point topLeft() const
> > > > +     Point origin() const
> > > >       {
> > > >               return { x, y };
> > > >       }
> > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> b/src/ipa/ipu3/algorithms/af.cpp
> > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> IPAConfigInfo &configInfo)
> > > >        * - Return the AF ROI as metadata in the Request
> > > >        */
> > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > -     Point start = roi.topLeft();
> > > > +     Point start = roi.origin();
> > > >
> > > >       /* x_start and y_start should be even */
> > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
> > > > index 000151364c7f..45ba81a99920 100644
> > > > --- a/src/libcamera/geometry.cpp
> > > > +++ b/src/libcamera/geometry.cpp
> > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> const SizeRange &sr)
> > > >    * \brief Describe a rectangle's position and dimensions
> > > >    *
> > > >    * Rectangles are used to identify an area of an image. They are
> specified by
> > > > - * the coordinates of top-left corner and their horizontal and
> vertical size.
> > > > + * the coordinates of the corner closer to the reference system's
> origin point
> > > > + * and by horizontal and vertical increments from there.
> > > >    *
> > > > - * The measure unit of the rectangle coordinates and size, as well
> as the
> > > > - * reference point from which the Rectangle::x and Rectangle::y
> displacements
> > > > - * refers to, are defined by the context were rectangle is used.
> > > > + * The corner closer to the reference system's origin point is the
> rectangle's
> > > > + * origin corner.
> > > > + *
> > > > + * \verbatim
> > > > +
> > > > +  o = origin corner
> > > > +
> > > > +         ^
> > > > +         |
> > > > +         |      -------------------
> > > > +         |      ^                 |
> > > > +         |      |                 |
> > > > +         |      o---->-------------
> > > > +         |
> > > > +          ------------------------------->
> > > > +         (0,0)
> > > > +
> > > > +         (0,0)
> > > > +           ------------------------------->
> > > > +          |
> > > > +          |      o---->-------------
> > > > +          |      |                 |
> > > > +          |      v                 |
> > > > +          |      -------------------
> > > > +          |
> > > > +          V
> > > > +   \endverbatim
> > > > + *
> > > > + * The measure unit of the rectangle coordinates and size are
> defined by the
> > > > + * context were the rectangle is used.
> > > >    */
> > > >
> > > >   /**
> > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> const SizeRange &sr)
> > > >   /**
> > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > >    * \brief Construct a Rectangle with the given position and size
> > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > + * \param[in] y The vertical coordinate of the origin corner
> > > >    * \param[in] size The size
> > > > + *
> > > > + * The rectangle's origin corner is the corner closer to the
> reference system
> > > > + * origin point (0, 0).
> >
> > I think we should stick to the previous description:
> > `"origin" point defined as the point with the lower x and
> > lower y of the rectangle`, as `x` and `y` are signed integers.
> >
> > If we only support coordinates that are positive or 0, which
> > I'm not sure if it's the case, how about making the type to be
> > `unsigned int`?
> >
>
> To be honest I would rather make width and heigh signed to allow
> constructing (x, y, -w, -h)
>
>
>
>
>                -------------------
>                |                 ^
>                |            ------------->
>                |           |     |
>                ------<-----|-----o
>                            |
>                            |
>                            V
>
> Not sure if it's useful or not though
>

Hmm... I find it pretty weird. What if all four corners have all negative
coordinates?




>
> > BR,
> > Harvey
> >
> >
> > > >    */
> > > >
> > > >   /**
> > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> unsigned int height)
> > > >    * \brief Construct a Rectangle with the given position and size
> > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > + * \param[in] y The vertical coordinate of the origin corner
> > > >    * \param[in] width The width
> > > >    * \param[in] height The height
> > > > + *
> > > > + * The rectangle's origin corner is the corner closer to the
> reference system
> > > > + * origin point (0, 0).
> > > >    */
> > > >
> > > >   /**
> > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > - * \brief Construct a Rectangle of \a size with its top left corner
> located
> > > > + * \brief Construct a Rectangle of \a size with its origin corner
> located
> > > >    * at (0,0)
> > > >    * \param[in] size The desired Rectangle size
> > > > + *
> > > > + * The rectangle's origin corner is the corner closer to the
> reference system
> > > > + * origin point (0, 0).
> > > >    */
> > > >
> > > >   /**
> > > >    * \var Rectangle::x
> > > > - * \brief The horizontal coordinate of the rectangle's top-left
> corner
> > > > + * \brief The horizontal coordinate of the rectangle's origin corner
> > > > + *
> > > > + * The rectangle's origin corner is the corner closer to the
> reference system
> > > > + * origin point (0, 0).
> > > >    */
> > > >
> > > >   /**
> > > >    * \var Rectangle::y
> > > > - * \brief The vertical coordinate of the rectangle's top-left corner
> > > > + * \brief The vertical coordinate of the rectangle's origin corner
> > > > + *
> > > > + * The rectangle's origin corner is the corner closer to the
> reference system
> > > > + * origin point (0, 0).
> > > >    */
> > > >
> > > >   /**
> > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > >    */
> > > >
> > > >   /**
> > > > - * \fn Point Rectangle::topLeft() const
> > > > - * \brief Retrieve the coordinates of the top left corner of this
> Rectangle
> > > > - * \return The Rectangle's top left corner
> > > > + * \fn Point Rectangle::origin() const
> > > > + * \brief Retrieve the coordinates of the origin corner of this
> Rectangle
> > > > + *
> > > > + * The rectangle's origin corner is the corner closer to the
> reference system
> > > > + * origin point (0, 0).
> > > > + *
> > > > + * \return The Rectangle's origin corner
> > >
> > > I think you can drop "corner" from "origin corner"
> > >
> > > Probably throughout the patch:
> > >      s/origin corner/origin/
> > >
> > > Otherwise, LGTM
> > >
> > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > >    */
> > > >
> > > >   /**
> > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const Point
> &point)
> > > >    */
> > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > >   {
> > > > -     int topLeftX = std::max(x, bound.x);
> > > > -     int topLeftY = std::max(y, bound.y);
> > > > +     int originX = std::max(x, bound.x);
> > > > +     int originY = std::max(y, bound.y);
> > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> bound.width);
> > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> bound.height);
> > > >
> > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX, 0);
> > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY, 0);
> > > > +     unsigned int newWidth = std::max(bottomRightX - originX, 0);
> > > > +     unsigned int newHeight = std::max(bottomRightY - originY, 0);
> > > >
> > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > +     return { originX, originY, newWidth, newHeight };
> > > >   }
> > > >
> > > >   /**
> > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> Rectangle &ispCrop) const
> > > >        */
> > > >       Rectangle nativeCrop =
> ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > >
>  sensorInfo_.outputSize);
> > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > >       return nativeCrop;
> > > >   }
> > > >
> > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> ControlList &controls)
> > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > >
> > > >               /* Create a version of the crop scaled to ISP (camera
> mode) pixels. */
> > > > -             Rectangle ispCrop =
> nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > +             Rectangle ispCrop =
> nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> sensorInfo_.analogCrop.size());
> > > >
> > > >               /*
> > > > diff --git a/src/py/libcamera/py_geometry.cpp
> b/src/py/libcamera/py_geometry.cpp
> > > > index c7e303609427..8dee365b25dd 100644
> > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > >               .def_property_readonly("is_null", &Rectangle::isNull)
> > > >               .def_property_readonly("center", &Rectangle::center)
> > > >               .def_property_readonly("size", &Rectangle::size)
> > > > -             .def_property_readonly("topLeft", &Rectangle::topLeft)
> > > > +             .def_property_readonly("origin", &Rectangle::origin)
> > > >               .def("scale_by", &Rectangle::scaleBy)
> > > >               .def("translate_by", &Rectangle::translateBy)
> > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > --- a/test/geometry.cpp
> > > > +++ b/test/geometry.cpp
> > > > @@ -363,16 +363,16 @@ protected:
> > > >                       return TestFail;
> > > >               }
> > > >
> > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> Rectangle::center() tests */
> > > > +             /* Rectangle::size(), Rectangle::origin() and
> Rectangle::center() tests */
> > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> Size(100000, 200000)) {
> > > >                       cout << "Rectangle::size() test failed" <<
> endl;
> > > >                       return TestFail;
> > > >               }
> > > >
> > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2) ||
> > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> -2)) {
> > > > -                     cout << "Rectangle::topLeft() test failed" <<
> endl;
> > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2) ||
> > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1, -2))
> {
> > > > +                     cout << "Rectangle::origin() test failed" <<
> endl;
> > > >                       return TestFail;
> > > >               }
> > > >
> > > > --
> > > > 2.46.1
> > > >
> > >
> >
> >
> > --
> > BR,
> > Harvey Yang
>

Hi Harvey

On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> Hi Jacopo,
>
> On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> wrote:
>
> > Hi Harvey
> >
> > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > Hi Jacopo,
> > >
> > > Thank you for the patch.
> > >
> > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <umang.jain@ideasonboard.com>
> > wrote:
> > > >
> > > > Hi Jacopo
> > > >
> > > > Thank you for the patch
> > > >
> > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > regardless of the reference system where an instance is used in.
> > > > >
> > > > > However the class documentation assumes the reference system origin
> > > > > point to be in the visual top-left side and that rectangles are
> > > > > constructed by specifying the top-left corner position and sizes.
> > > > >
> > > > > However this is ambiguous when using a different reference system as,
> > > > > in example, constructing a rectangle (x, y, w, h) in the following
> > > > > scenario, with the origin corner in the top-left position, would
> > require
> > > > > a negative decrement along the y-axis.
> > > > >
> > > > >           ^
> > > > >           |
> > > > >          y|      o------------------
> > > > >           |      |                 | h
> > > > >           |      |                 |
> > > > >           |      -------------------
> > > > >           |               w
> > > > >            ------------------------------->
> > > > >           (0,0)  x
> > > > >
> > > > > To remove ambiguities, drop references to the visual top-left corner
> > and
> > > > > define the rectangle's origin corner as the corner closer to the
> > > > > reference system origin point, and specify the horizontal and
> > vertical
> > > > > dimensions always increment along their respective axis, as in the
> > > > > following example.
> > > > >
> > > > >           ^
> > > > >           |
> > > > >           |      -------------------
> > > > >           |      ^                 | h
> > > > >           |      |                 |
> > > > >          y|      o---->-------------
> > > > >           |               w
> > > > >            ------------------------------->
> > > > >           (0,0)  x
> > > > >
> > > > >           (0,0)  x
> > > > >             ------------------------------>
> > > > >            |              w
> > > > >           y|     o---->-------------
> > > > >            |     |                 | h
> > > > >            |     v                 |
> > > > >            |     -------------------
> > > > >            |
> > > > >            V
> > > > >
> > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > Rectangle::origin() and update its in-tree users.
> > > > >
> > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > ---
> > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > >   src/libcamera/geometry.cpp                    | 85
> > ++++++++++++++-----
> > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > >   test/geometry.cpp                             |  8 +-
> > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > >
> > > > > diff --git a/include/libcamera/geometry.h
> > b/include/libcamera/geometry.h
> > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > --- a/include/libcamera/geometry.h
> > > > > +++ b/include/libcamera/geometry.h
> > > > > @@ -277,7 +277,7 @@ public:
> > > > >               return { width, height };
> > > > >       }
> > > > >
> > > > > -     Point topLeft() const
> > > > > +     Point origin() const
> > > > >       {
> > > > >               return { x, y };
> > > > >       }
> > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > IPAConfigInfo &configInfo)
> > > > >        * - Return the AF ROI as metadata in the Request
> > > > >        */
> > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > -     Point start = roi.topLeft();
> > > > > +     Point start = roi.origin();
> > > > >
> > > > >       /* x_start and y_start should be even */
> > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
> > > > > index 000151364c7f..45ba81a99920 100644
> > > > > --- a/src/libcamera/geometry.cpp
> > > > > +++ b/src/libcamera/geometry.cpp
> > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > const SizeRange &sr)
> > > > >    * \brief Describe a rectangle's position and dimensions
> > > > >    *
> > > > >    * Rectangles are used to identify an area of an image. They are
> > specified by
> > > > > - * the coordinates of top-left corner and their horizontal and
> > vertical size.
> > > > > + * the coordinates of the corner closer to the reference system's
> > origin point
> > > > > + * and by horizontal and vertical increments from there.
> > > > >    *
> > > > > - * The measure unit of the rectangle coordinates and size, as well
> > as the
> > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > displacements
> > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > + * The corner closer to the reference system's origin point is the
> > rectangle's
> > > > > + * origin corner.
> > > > > + *
> > > > > + * \verbatim
> > > > > +
> > > > > +  o = origin corner
> > > > > +
> > > > > +         ^
> > > > > +         |
> > > > > +         |      -------------------
> > > > > +         |      ^                 |
> > > > > +         |      |                 |
> > > > > +         |      o---->-------------
> > > > > +         |
> > > > > +          ------------------------------->
> > > > > +         (0,0)
> > > > > +
> > > > > +         (0,0)
> > > > > +           ------------------------------->
> > > > > +          |
> > > > > +          |      o---->-------------
> > > > > +          |      |                 |
> > > > > +          |      v                 |
> > > > > +          |      -------------------
> > > > > +          |
> > > > > +          V
> > > > > +   \endverbatim
> > > > > + *
> > > > > + * The measure unit of the rectangle coordinates and size are
> > defined by the
> > > > > + * context were the rectangle is used.
> > > > >    */
> > > > >
> > > > >   /**
> > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > const SizeRange &sr)
> > > > >   /**
> > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > >    * \brief Construct a Rectangle with the given position and size
> > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > >    * \param[in] size The size
> > > > > + *
> > > > > + * The rectangle's origin corner is the corner closer to the
> > reference system
> > > > > + * origin point (0, 0).
> > >
> > > I think we should stick to the previous description:
> > > `"origin" point defined as the point with the lower x and
> > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > >
> > > If we only support coordinates that are positive or 0, which
> > > I'm not sure if it's the case, how about making the type to be
> > > `unsigned int`?
> > >
> >
> > To be honest I would rather make width and heigh signed to allow
> > constructing (x, y, -w, -h)
> >
> >
> >
> >
> >                -------------------
> >                |                 ^
> >                |            ------------->
> >                |           |     |
> >                ------<-----|-----o
> >                            |
> >                            |
> >                            V
> >
> > Not sure if it's useful or not though
> >
>
> Hmm... I find it pretty weird. What if all four corners have all negative
> coordinates?
>
>

Don't know, maybe if the reference system where the rectangle is used
into has 4 planes and so an all-negative rectangle makes sense.

My point is that we should allow users of this class to express
Rectangle in any context they plan to use them. Not sure if I'm going
overboard here or it makes sense.

>
>
> >
> > > BR,
> > > Harvey
> > >
> > >
> > > > >    */
> > > > >
> > > > >   /**
> > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > unsigned int height)
> > > > >    * \brief Construct a Rectangle with the given position and size
> > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > >    * \param[in] width The width
> > > > >    * \param[in] height The height
> > > > > + *
> > > > > + * The rectangle's origin corner is the corner closer to the
> > reference system
> > > > > + * origin point (0, 0).
> > > > >    */
> > > > >
> > > > >   /**
> > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > - * \brief Construct a Rectangle of \a size with its top left corner
> > located
> > > > > + * \brief Construct a Rectangle of \a size with its origin corner
> > located
> > > > >    * at (0,0)
> > > > >    * \param[in] size The desired Rectangle size
> > > > > + *
> > > > > + * The rectangle's origin corner is the corner closer to the
> > reference system
> > > > > + * origin point (0, 0).
> > > > >    */
> > > > >
> > > > >   /**
> > > > >    * \var Rectangle::x
> > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > corner
> > > > > + * \brief The horizontal coordinate of the rectangle's origin corner
> > > > > + *
> > > > > + * The rectangle's origin corner is the corner closer to the
> > reference system
> > > > > + * origin point (0, 0).
> > > > >    */
> > > > >
> > > > >   /**
> > > > >    * \var Rectangle::y
> > > > > - * \brief The vertical coordinate of the rectangle's top-left corner
> > > > > + * \brief The vertical coordinate of the rectangle's origin corner
> > > > > + *
> > > > > + * The rectangle's origin corner is the corner closer to the
> > reference system
> > > > > + * origin point (0, 0).
> > > > >    */
> > > > >
> > > > >   /**
> > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > >    */
> > > > >
> > > > >   /**
> > > > > - * \fn Point Rectangle::topLeft() const
> > > > > - * \brief Retrieve the coordinates of the top left corner of this
> > Rectangle
> > > > > - * \return The Rectangle's top left corner
> > > > > + * \fn Point Rectangle::origin() const
> > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > Rectangle
> > > > > + *
> > > > > + * The rectangle's origin corner is the corner closer to the
> > reference system
> > > > > + * origin point (0, 0).
> > > > > + *
> > > > > + * \return The Rectangle's origin corner
> > > >
> > > > I think you can drop "corner" from "origin corner"
> > > >
> > > > Probably throughout the patch:
> > > >      s/origin corner/origin/
> > > >
> > > > Otherwise, LGTM
> > > >
> > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > >    */
> > > > >
> > > > >   /**
> > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const Point
> > &point)
> > > > >    */
> > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > >   {
> > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > +     int originX = std::max(x, bound.x);
> > > > > +     int originY = std::max(y, bound.y);
> > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > bound.width);
> > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > bound.height);
> > > > >
> > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX, 0);
> > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY, 0);
> > > > > +     unsigned int newWidth = std::max(bottomRightX - originX, 0);
> > > > > +     unsigned int newHeight = std::max(bottomRightY - originY, 0);
> > > > >
> > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > +     return { originX, originY, newWidth, newHeight };
> > > > >   }
> > > > >
> > > > >   /**
> > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > Rectangle &ispCrop) const
> > > > >        */
> > > > >       Rectangle nativeCrop =
> > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > >
> >  sensorInfo_.outputSize);
> > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > >       return nativeCrop;
> > > > >   }
> > > > >
> > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > ControlList &controls)
> > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > >
> > > > >               /* Create a version of the crop scaled to ISP (camera
> > mode) pixels. */
> > > > > -             Rectangle ispCrop =
> > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > +             Rectangle ispCrop =
> > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > sensorInfo_.analogCrop.size());
> > > > >
> > > > >               /*
> > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > b/src/py/libcamera/py_geometry.cpp
> > > > > index c7e303609427..8dee365b25dd 100644
> > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > >               .def_property_readonly("is_null", &Rectangle::isNull)
> > > > >               .def_property_readonly("center", &Rectangle::center)
> > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > -             .def_property_readonly("topLeft", &Rectangle::topLeft)
> > > > > +             .def_property_readonly("origin", &Rectangle::origin)
> > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > --- a/test/geometry.cpp
> > > > > +++ b/test/geometry.cpp
> > > > > @@ -363,16 +363,16 @@ protected:
> > > > >                       return TestFail;
> > > > >               }
> > > > >
> > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > Rectangle::center() tests */
> > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > Rectangle::center() tests */
> > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > Size(100000, 200000)) {
> > > > >                       cout << "Rectangle::size() test failed" <<
> > endl;
> > > > >                       return TestFail;
> > > > >               }
> > > > >
> > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2) ||
> > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > -2)) {
> > > > > -                     cout << "Rectangle::topLeft() test failed" <<
> > endl;
> > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2) ||
> > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1, -2))
> > {
> > > > > +                     cout << "Rectangle::origin() test failed" <<
> > endl;
> > > > >                       return TestFail;
> > > > >               }
> > > > >
> > > > > --
> > > > > 2.46.1
> > > > >
> > > >
> > >
> > >
> > > --
> > > BR,
> > > Harvey Yang
> >

Hi Jacopo

On 26/09/24 1:25 pm, Jacopo Mondi wrote:
> Hi Umang
>
> On Wed, Sep 25, 2024 at 12:06:05PM GMT, Umang Jain wrote:
>> Hi Jacopo
>>
>> Thank you for the patch
>>
>> On 24/09/24 6:15 pm, Jacopo Mondi wrote:
>>> The libcamera::Rectangle class should allow defining rectangles
>>> regardless of the reference system where an instance is used in.
>>>
>>> However the class documentation assumes the reference system origin
>>> point to be in the visual top-left side and that rectangles are
>>> constructed by specifying the top-left corner position and sizes.
>>>
>>> However this is ambiguous when using a different reference system as,
>>> in example, constructing a rectangle (x, y, w, h) in the following
>>> scenario, with the origin corner in the top-left position, would require
>>> a negative decrement along the y-axis.
>>>
>>>            ^
>>>            |
>>>           y|      o------------------
>>>            |      |                 | h
>>>            |      |                 |
>>>            |      -------------------
>>>            |               w
>>>             ------------------------------->
>>>            (0,0)  x
>>>
>>> To remove ambiguities, drop references to the visual top-left corner and
>>> define the rectangle's origin corner as the corner closer to the
>>> reference system origin point, and specify the horizontal and vertical
>>> dimensions always increment along their respective axis, as in the
>>> following example.
>>>
>>>            ^
>>>            |
>>>            |      -------------------
>>>            |      ^                 | h
>>>            |      |                 |
>>>           y|      o---->-------------
>>>            |               w
>>>             ------------------------------->
>>>            (0,0)  x
>>>
>>>            (0,0)  x
>>>              ------------------------------>
>>>             |              w
>>>            y|     o---->-------------
>>>             |     |                 | h
>>>             |     v                 |
>>>             |     -------------------
>>>             |
>>>             V
>>>
>>> Also rename for consistency the Rectangle::topLeft() function to
>>> Rectangle::origin() and update its in-tree users.
>>>
>>> Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
>>> ---
>>>    include/libcamera/geometry.h                  |  2 +-
>>>    src/ipa/ipu3/algorithms/af.cpp                |  2 +-
>>>    src/libcamera/geometry.cpp                    | 85 ++++++++++++++-----
>>>    .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
>>>    src/py/libcamera/py_geometry.cpp              |  2 +-
>>>    test/geometry.cpp                             |  8 +-
>>>    6 files changed, 75 insertions(+), 28 deletions(-)
>>>
>>> diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
>>> index 3e6f0f5d7fab..07cb0a7866fe 100644
>>> --- a/include/libcamera/geometry.h
>>> +++ b/include/libcamera/geometry.h
>>> @@ -277,7 +277,7 @@ public:
>>>    		return { width, height };
>>>    	}
>>>
>>> -	Point topLeft() const
>>> +	Point origin() const
>>>    	{
>>>    		return { x, y };
>>>    	}
>>> diff --git a/src/ipa/ipu3/algorithms/af.cpp b/src/ipa/ipu3/algorithms/af.cpp
>>> index cf68fb59c49b..1b707e9dd9ab 100644
>>> --- a/src/ipa/ipu3/algorithms/af.cpp
>>> +++ b/src/ipa/ipu3/algorithms/af.cpp
>>> @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const IPAConfigInfo &configInfo)
>>>    	 * - Return the AF ROI as metadata in the Request
>>>    	 */
>>>    	Rectangle roi = gridSize.centeredTo(bds.center());
>>> -	Point start = roi.topLeft();
>>> +	Point start = roi.origin();
>>>
>>>    	/* x_start and y_start should be even */
>>>    	grid.x_start = utils::alignDown(start.x, 2);
>>> diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
>>> index 000151364c7f..45ba81a99920 100644
>>> --- a/src/libcamera/geometry.cpp
>>> +++ b/src/libcamera/geometry.cpp
>>> @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
>>>     * \brief Describe a rectangle's position and dimensions
>>>     *
>>>     * Rectangles are used to identify an area of an image. They are specified by
>>> - * the coordinates of top-left corner and their horizontal and vertical size.
>>> + * the coordinates of the corner closer to the reference system's origin point
>>> + * and by horizontal and vertical increments from there.
>>>     *
>>> - * The measure unit of the rectangle coordinates and size, as well as the
>>> - * reference point from which the Rectangle::x and Rectangle::y displacements
>>> - * refers to, are defined by the context were rectangle is used.
>>> + * The corner closer to the reference system's origin point is the rectangle's
>>> + * origin corner.
>>> + *
>>> + * \verbatim
>>> +
>>> +  o = origin corner
>>> +
>>> +         ^
>>> +         |
>>> +         |      -------------------
>>> +         |      ^                 |
>>> +         |      |                 |
>>> +         |      o---->-------------
>>> +         |
>>> +          ------------------------------->
>>> +         (0,0)
>>> +
>>> +         (0,0)
>>> +           ------------------------------->
>>> +          |
>>> +          |      o---->-------------
>>> +          |      |                 |
>>> +          |      v                 |
>>> +          |      -------------------
>>> +          |
>>> +          V
>>> +   \endverbatim
>>> + *
>>> + * The measure unit of the rectangle coordinates and size are defined by the
>>> + * context were the rectangle is used.
>>>     */
>>>
>>>    /**
>>> @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out, const SizeRange &sr)
>>>    /**
>>>     * \fn Rectangle::Rectangle(int x, int y, const Size &size)
>>>     * \brief Construct a Rectangle with the given position and size
>>> - * \param[in] x The horizontal coordinate of the top-left corner
>>> - * \param[in] y The vertical coordinate of the top-left corner
>>> + * \param[in] x The horizontal coordinate of the origin corner
>>> + * \param[in] y The vertical coordinate of the origin corner
>>>     * \param[in] size The size
>>> + *
>>> + * The rectangle's origin corner is the corner closer to the reference system
>>> + * origin point (0, 0).
>>>     */
>>>
>>>    /**
>>>     * \fn Rectangle::Rectangle(int x, int y, unsigned int width, unsigned int height)
>>>     * \brief Construct a Rectangle with the given position and size
>>> - * \param[in] x The horizontal coordinate of the top-left corner
>>> - * \param[in] y The vertical coordinate of the top-left corner
>>> + * \param[in] x The horizontal coordinate of the origin corner
>>> + * \param[in] y The vertical coordinate of the origin corner
>>>     * \param[in] width The width
>>>     * \param[in] height The height
>>> + *
>>> + * The rectangle's origin corner is the corner closer to the reference system
>>> + * origin point (0, 0).
>>>     */
>>>
>>>    /**
>>>     * \fn Rectangle::Rectangle(const Size &size)
>>> - * \brief Construct a Rectangle of \a size with its top left corner located
>>> + * \brief Construct a Rectangle of \a size with its origin corner located
>>>     * at (0,0)
>>>     * \param[in] size The desired Rectangle size
>>> + *
>>> + * The rectangle's origin corner is the corner closer to the reference system
>>> + * origin point (0, 0).
>>>     */
>>>
>>>    /**
>>>     * \var Rectangle::x
>>> - * \brief The horizontal coordinate of the rectangle's top-left corner
>>> + * \brief The horizontal coordinate of the rectangle's origin corner
>>> + *
>>> + * The rectangle's origin corner is the corner closer to the reference system
>>> + * origin point (0, 0).
>>>     */
>>>
>>>    /**
>>>     * \var Rectangle::y
>>> - * \brief The vertical coordinate of the rectangle's top-left corner
>>> + * \brief The vertical coordinate of the rectangle's origin corner
>>> + *
>>> + * The rectangle's origin corner is the corner closer to the reference system
>>> + * origin point (0, 0).
>>>     */
>>>
>>>    /**
>>> @@ -683,9 +726,13 @@ Point Rectangle::center() const
>>>     */
>>>
>>>    /**
>>> - * \fn Point Rectangle::topLeft() const
>>> - * \brief Retrieve the coordinates of the top left corner of this Rectangle
>>> - * \return The Rectangle's top left corner
>>> + * \fn Point Rectangle::origin() const
>>> + * \brief Retrieve the coordinates of the origin corner of this Rectangle
>>> + *
>>> + * The rectangle's origin corner is the corner closer to the reference system
>>> + * origin point (0, 0).
>>> + *
>>> + * \return The Rectangle's origin corner
>> I think you can drop "corner" from "origin corner"
>>
>> Probably throughout the patch:
>>      s/origin corner/origin/
>>
> I considered that, but as a "rectangle origin" is not a well-defined
> term in geometry I prefer to specify it's a corner. Is this ok ?

Maybe "rectangle origin vertex"  ?

Just a suggestion. Keep what you think is best!

>
>> Otherwise, LGTM
>>
>> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> Thanks
>    j
>
>>>     */
>>>
>>>    /**
>>> @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const Point &point)
>>>     */
>>>    Rectangle Rectangle::boundedTo(const Rectangle &bound) const
>>>    {
>>> -	int topLeftX = std::max(x, bound.x);
>>> -	int topLeftY = std::max(y, bound.y);
>>> +	int originX = std::max(x, bound.x);
>>> +	int originY = std::max(y, bound.y);
>>>    	int bottomRightX = std::min<int>(x + width, bound.x + bound.width);
>>>    	int bottomRightY = std::min<int>(y + height, bound.y + bound.height);
>>>
>>> -	unsigned int newWidth = std::max(bottomRightX - topLeftX, 0);
>>> -	unsigned int newHeight = std::max(bottomRightY - topLeftY, 0);
>>> +	unsigned int newWidth = std::max(bottomRightX - originX, 0);
>>> +	unsigned int newHeight = std::max(bottomRightY - originY, 0);
>>>
>>> -	return { topLeftX, topLeftY, newWidth, newHeight };
>>> +	return { originX, originY, newWidth, newHeight };
>>>    }
>>>
>>>    /**
>>> diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
>>> index 3041fd1ed9fd..8d2440026689 100644
>>> --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
>>> +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
>>> @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const Rectangle &ispCrop) const
>>>    	 */
>>>    	Rectangle nativeCrop = ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
>>>    						sensorInfo_.outputSize);
>>> -	nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
>>> +	nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
>>>    	return nativeCrop;
>>>    }
>>>
>>> @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const ControlList &controls)
>>>    			nativeCrop = { 0, 0, 1, 1 };
>>>
>>>    		/* Create a version of the crop scaled to ISP (camera mode) pixels. */
>>> -		Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
>>> +		Rectangle ispCrop = nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
>>>    		ispCrop.scaleBy(sensorInfo_.outputSize, sensorInfo_.analogCrop.size());
>>>
>>>    		/*
>>> diff --git a/src/py/libcamera/py_geometry.cpp b/src/py/libcamera/py_geometry.cpp
>>> index c7e303609427..8dee365b25dd 100644
>>> --- a/src/py/libcamera/py_geometry.cpp
>>> +++ b/src/py/libcamera/py_geometry.cpp
>>> @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
>>>    		.def_property_readonly("is_null", &Rectangle::isNull)
>>>    		.def_property_readonly("center", &Rectangle::center)
>>>    		.def_property_readonly("size", &Rectangle::size)
>>> -		.def_property_readonly("topLeft", &Rectangle::topLeft)
>>> +		.def_property_readonly("origin", &Rectangle::origin)
>>>    		.def("scale_by", &Rectangle::scaleBy)
>>>    		.def("translate_by", &Rectangle::translateBy)
>>>    		.def("bounded_to", &Rectangle::boundedTo)
>>> diff --git a/test/geometry.cpp b/test/geometry.cpp
>>> index 64169206ad16..a4ee6f6e167a 100644
>>> --- a/test/geometry.cpp
>>> +++ b/test/geometry.cpp
>>> @@ -363,16 +363,16 @@ protected:
>>>    			return TestFail;
>>>    		}
>>>
>>> -		/* Rectangle::size(), Rectangle::topLeft() and Rectangle::center() tests */
>>> +		/* Rectangle::size(), Rectangle::origin() and Rectangle::center() tests */
>>>    		if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
>>>    		    Rectangle(0, 0, 100000, 200000).size() != Size(100000, 200000)) {
>>>    			cout << "Rectangle::size() test failed" << endl;
>>>    			return TestFail;
>>>    		}
>>>
>>> -		if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2) ||
>>> -		    Rectangle(-1, -2, 3, 4).topLeft() != Point(-1, -2)) {
>>> -			cout << "Rectangle::topLeft() test failed" << endl;
>>> +		if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2) ||
>>> +		    Rectangle(-1, -2, 3, 4).origin() != Point(-1, -2)) {
>>> +			cout << "Rectangle::origin() test failed" << endl;
>>>    			return TestFail;
>>>    		}
>>>
>>> --
>>> 2.46.1
>>>

Hi Jacopo,



On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
wrote:

> Hi Harvey
>
> On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > Hi Jacopo,
> >
> > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> jacopo.mondi@ideasonboard.com>
> > wrote:
> >
> > > Hi Harvey
> > >
> > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > Hi Jacopo,
> > > >
> > > > Thank you for the patch.
> > > >
> > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> umang.jain@ideasonboard.com>
> > > wrote:
> > > > >
> > > > > Hi Jacopo
> > > > >
> > > > > Thank you for the patch
> > > > >
> > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > regardless of the reference system where an instance is used in.
> > > > > >
> > > > > > However the class documentation assumes the reference system
> origin
> > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > >
> > > > > > However this is ambiguous when using a different reference
> system as,
> > > > > > in example, constructing a rectangle (x, y, w, h) in the
> following
> > > > > > scenario, with the origin corner in the top-left position, would
> > > require
> > > > > > a negative decrement along the y-axis.
> > > > > >
> > > > > >           ^
> > > > > >           |
> > > > > >          y|      o------------------
> > > > > >           |      |                 | h
> > > > > >           |      |                 |
> > > > > >           |      -------------------
> > > > > >           |               w
> > > > > >            ------------------------------->
> > > > > >           (0,0)  x
> > > > > >
> > > > > > To remove ambiguities, drop references to the visual top-left
> corner
> > > and
> > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > reference system origin point, and specify the horizontal and
> > > vertical
> > > > > > dimensions always increment along their respective axis, as in
> the
> > > > > > following example.
> > > > > >
> > > > > >           ^
> > > > > >           |
> > > > > >           |      -------------------
> > > > > >           |      ^                 | h
> > > > > >           |      |                 |
> > > > > >          y|      o---->-------------
> > > > > >           |               w
> > > > > >            ------------------------------->
> > > > > >           (0,0)  x
> > > > > >
> > > > > >           (0,0)  x
> > > > > >             ------------------------------>
> > > > > >            |              w
> > > > > >           y|     o---->-------------
> > > > > >            |     |                 | h
> > > > > >            |     v                 |
> > > > > >            |     -------------------
> > > > > >            |
> > > > > >            V
> > > > > >
> > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > Rectangle::origin() and update its in-tree users.
> > > > > >
> > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > ---
> > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > >   src/libcamera/geometry.cpp                    | 85
> > > ++++++++++++++-----
> > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > >   test/geometry.cpp                             |  8 +-
> > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > >
> > > > > > diff --git a/include/libcamera/geometry.h
> > > b/include/libcamera/geometry.h
> > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > --- a/include/libcamera/geometry.h
> > > > > > +++ b/include/libcamera/geometry.h
> > > > > > @@ -277,7 +277,7 @@ public:
> > > > > >               return { width, height };
> > > > > >       }
> > > > > >
> > > > > > -     Point topLeft() const
> > > > > > +     Point origin() const
> > > > > >       {
> > > > > >               return { x, y };
> > > > > >       }
> > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > IPAConfigInfo &configInfo)
> > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > >        */
> > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > -     Point start = roi.topLeft();
> > > > > > +     Point start = roi.origin();
> > > > > >
> > > > > >       /* x_start and y_start should be even */
> > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > diff --git a/src/libcamera/geometry.cpp
> b/src/libcamera/geometry.cpp
> > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > const SizeRange &sr)
> > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > >    *
> > > > > >    * Rectangles are used to identify an area of an image. They
> are
> > > specified by
> > > > > > - * the coordinates of top-left corner and their horizontal and
> > > vertical size.
> > > > > > + * the coordinates of the corner closer to the reference
> system's
> > > origin point
> > > > > > + * and by horizontal and vertical increments from there.
> > > > > >    *
> > > > > > - * The measure unit of the rectangle coordinates and size, as
> well
> > > as the
> > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > displacements
> > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > + * The corner closer to the reference system's origin point is
> the
> > > rectangle's
> > > > > > + * origin corner.
> > > > > > + *
> > > > > > + * \verbatim
> > > > > > +
> > > > > > +  o = origin corner
> > > > > > +
> > > > > > +         ^
> > > > > > +         |
> > > > > > +         |      -------------------
> > > > > > +         |      ^                 |
> > > > > > +         |      |                 |
> > > > > > +         |      o---->-------------
> > > > > > +         |
> > > > > > +          ------------------------------->
> > > > > > +         (0,0)
> > > > > > +
> > > > > > +         (0,0)
> > > > > > +           ------------------------------->
> > > > > > +          |
> > > > > > +          |      o---->-------------
> > > > > > +          |      |                 |
> > > > > > +          |      v                 |
> > > > > > +          |      -------------------
> > > > > > +          |
> > > > > > +          V
> > > > > > +   \endverbatim
> > > > > > + *
> > > > > > + * The measure unit of the rectangle coordinates and size are
> > > defined by the
> > > > > > + * context were the rectangle is used.
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > const SizeRange &sr)
> > > > > >   /**
> > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > >    * \brief Construct a Rectangle with the given position and
> size
> > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > >    * \param[in] size The size
> > > > > > + *
> > > > > > + * The rectangle's origin corner is the corner closer to the
> > > reference system
> > > > > > + * origin point (0, 0).
> > > >
> > > > I think we should stick to the previous description:
> > > > `"origin" point defined as the point with the lower x and
> > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > >
> > > > If we only support coordinates that are positive or 0, which
> > > > I'm not sure if it's the case, how about making the type to be
> > > > `unsigned int`?
> > > >
> > >
> > > To be honest I would rather make width and heigh signed to allow
> > > constructing (x, y, -w, -h)
> > >
> > >
> > >
> > >
> > >                -------------------
> > >                |                 ^
> > >                |            ------------->
> > >                |           |     |
> > >                ------<-----|-----o
> > >                            |
> > >                            |
> > >                            V
> > >
> > > Not sure if it's useful or not though
> > >
> >
> > Hmm... I find it pretty weird. What if all four corners have all negative
> > coordinates?
> >
> >
>
> Don't know, maybe if the reference system where the rectangle is used
> into has 4 planes and so an all-negative rectangle makes sense.
>
> My point is that we should allow users of this class to express
> Rectangle in any context they plan to use them. Not sure if I'm going
> overboard here or it makes sense.
>

Yeah I agree, while doesn't that mean the description doesn't fit all
cases, like the corner closer to the reference system origin point of a
rectangle that has all negative coordinates is actually the "bottom-right"
corner, and currently libcamera::Size only allows non-negative width and
height [1].

[1]:
https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65


> >
> >
> > >
> > > > BR,
> > > > Harvey
> > > >
> > > >
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > unsigned int height)
> > > > > >    * \brief Construct a Rectangle with the given position and
> size
> > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > >    * \param[in] width The width
> > > > > >    * \param[in] height The height
> > > > > > + *
> > > > > > + * The rectangle's origin corner is the corner closer to the
> > > reference system
> > > > > > + * origin point (0, 0).
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > - * \brief Construct a Rectangle of \a size with its top left
> corner
> > > located
> > > > > > + * \brief Construct a Rectangle of \a size with its origin
> corner
> > > located
> > > > > >    * at (0,0)
> > > > > >    * \param[in] size The desired Rectangle size
> > > > > > + *
> > > > > > + * The rectangle's origin corner is the corner closer to the
> > > reference system
> > > > > > + * origin point (0, 0).
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > >    * \var Rectangle::x
> > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > corner
> > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> corner
> > > > > > + *
> > > > > > + * The rectangle's origin corner is the corner closer to the
> > > reference system
> > > > > > + * origin point (0, 0).
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > >    * \var Rectangle::y
> > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> corner
> > > > > > + * \brief The vertical coordinate of the rectangle's origin
> corner
> > > > > > + *
> > > > > > + * The rectangle's origin corner is the corner closer to the
> > > reference system
> > > > > > + * origin point (0, 0).
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > - * \brief Retrieve the coordinates of the top left corner of
> this
> > > Rectangle
> > > > > > - * \return The Rectangle's top left corner
> > > > > > + * \fn Point Rectangle::origin() const
> > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > Rectangle
> > > > > > + *
> > > > > > + * The rectangle's origin corner is the corner closer to the
> > > reference system
> > > > > > + * origin point (0, 0).
> > > > > > + *
> > > > > > + * \return The Rectangle's origin corner
> > > > >
> > > > > I think you can drop "corner" from "origin corner"
> > > > >
> > > > > Probably throughout the patch:
> > > > >      s/origin corner/origin/
> > > > >
> > > > > Otherwise, LGTM
> > > > >
> > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > >    */
> > > > > >
> > > > > >   /**
> > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> Point
> > > &point)
> > > > > >    */
> > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > >   {
> > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > +     int originX = std::max(x, bound.x);
> > > > > > +     int originY = std::max(y, bound.y);
> > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > bound.width);
> > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > bound.height);
> > > > > >
> > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> 0);
> > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> 0);
> > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> 0);
> > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> 0);
> > > > > >
> > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > >   }
> > > > > >
> > > > > >   /**
> > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > Rectangle &ispCrop) const
> > > > > >        */
> > > > > >       Rectangle nativeCrop =
> > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > >
> > >  sensorInfo_.outputSize);
> > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > >       return nativeCrop;
> > > > > >   }
> > > > > >
> > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > ControlList &controls)
> > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > >
> > > > > >               /* Create a version of the crop scaled to ISP
> (camera
> > > mode) pixels. */
> > > > > > -             Rectangle ispCrop =
> > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > +             Rectangle ispCrop =
> > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > sensorInfo_.analogCrop.size());
> > > > > >
> > > > > >               /*
> > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > b/src/py/libcamera/py_geometry.cpp
> > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > >               .def_property_readonly("is_null",
> &Rectangle::isNull)
> > > > > >               .def_property_readonly("center",
> &Rectangle::center)
> > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > -             .def_property_readonly("topLeft",
> &Rectangle::topLeft)
> > > > > > +             .def_property_readonly("origin",
> &Rectangle::origin)
> > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > --- a/test/geometry.cpp
> > > > > > +++ b/test/geometry.cpp
> > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > >                       return TestFail;
> > > > > >               }
> > > > > >
> > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > Rectangle::center() tests */
> > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > Rectangle::center() tests */
> > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > Size(100000, 200000)) {
> > > > > >                       cout << "Rectangle::size() test failed" <<
> > > endl;
> > > > > >                       return TestFail;
> > > > > >               }
> > > > > >
> > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> ||
> > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > -2)) {
> > > > > > -                     cout << "Rectangle::topLeft() test failed"
> <<
> > > endl;
> > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> ||
> > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> -2))
> > > {
> > > > > > +                     cout << "Rectangle::origin() test failed"
> <<
> > > endl;
> > > > > >                       return TestFail;
> > > > > >               }
> > > > > >
> > > > > > --
> > > > > > 2.46.1
> > > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > BR,
> > > > Harvey Yang
> > >
>

Hi Harvey

On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> Hi Jacopo,
>
>
>
> On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> wrote:
>
> > Hi Harvey
> >
> > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > Hi Jacopo,
> > >
> > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > jacopo.mondi@ideasonboard.com>
> > > wrote:
> > >
> > > > Hi Harvey
> > > >
> > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > Hi Jacopo,
> > > > >
> > > > > Thank you for the patch.
> > > > >
> > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > umang.jain@ideasonboard.com>
> > > > wrote:
> > > > > >
> > > > > > Hi Jacopo
> > > > > >
> > > > > > Thank you for the patch
> > > > > >
> > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > regardless of the reference system where an instance is used in.
> > > > > > >
> > > > > > > However the class documentation assumes the reference system
> > origin
> > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > >
> > > > > > > However this is ambiguous when using a different reference
> > system as,
> > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > following
> > > > > > > scenario, with the origin corner in the top-left position, would
> > > > require
> > > > > > > a negative decrement along the y-axis.
> > > > > > >
> > > > > > >           ^
> > > > > > >           |
> > > > > > >          y|      o------------------
> > > > > > >           |      |                 | h
> > > > > > >           |      |                 |
> > > > > > >           |      -------------------
> > > > > > >           |               w
> > > > > > >            ------------------------------->
> > > > > > >           (0,0)  x
> > > > > > >
> > > > > > > To remove ambiguities, drop references to the visual top-left
> > corner
> > > > and
> > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > reference system origin point, and specify the horizontal and
> > > > vertical
> > > > > > > dimensions always increment along their respective axis, as in
> > the
> > > > > > > following example.
> > > > > > >
> > > > > > >           ^
> > > > > > >           |
> > > > > > >           |      -------------------
> > > > > > >           |      ^                 | h
> > > > > > >           |      |                 |
> > > > > > >          y|      o---->-------------
> > > > > > >           |               w
> > > > > > >            ------------------------------->
> > > > > > >           (0,0)  x
> > > > > > >
> > > > > > >           (0,0)  x
> > > > > > >             ------------------------------>
> > > > > > >            |              w
> > > > > > >           y|     o---->-------------
> > > > > > >            |     |                 | h
> > > > > > >            |     v                 |
> > > > > > >            |     -------------------
> > > > > > >            |
> > > > > > >            V
> > > > > > >
> > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > >
> > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > ---
> > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > ++++++++++++++-----
> > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > >
> > > > > > > diff --git a/include/libcamera/geometry.h
> > > > b/include/libcamera/geometry.h
> > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > >               return { width, height };
> > > > > > >       }
> > > > > > >
> > > > > > > -     Point topLeft() const
> > > > > > > +     Point origin() const
> > > > > > >       {
> > > > > > >               return { x, y };
> > > > > > >       }
> > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > IPAConfigInfo &configInfo)
> > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > >        */
> > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > -     Point start = roi.topLeft();
> > > > > > > +     Point start = roi.origin();
> > > > > > >
> > > > > > >       /* x_start and y_start should be even */
> > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > diff --git a/src/libcamera/geometry.cpp
> > b/src/libcamera/geometry.cpp
> > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > const SizeRange &sr)
> > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > >    *
> > > > > > >    * Rectangles are used to identify an area of an image. They
> > are
> > > > specified by
> > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > vertical size.
> > > > > > > + * the coordinates of the corner closer to the reference
> > system's
> > > > origin point
> > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > >    *
> > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > well
> > > > as the
> > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > displacements
> > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > + * The corner closer to the reference system's origin point is
> > the
> > > > rectangle's
> > > > > > > + * origin corner.
> > > > > > > + *
> > > > > > > + * \verbatim
> > > > > > > +
> > > > > > > +  o = origin corner
> > > > > > > +
> > > > > > > +         ^
> > > > > > > +         |
> > > > > > > +         |      -------------------
> > > > > > > +         |      ^                 |
> > > > > > > +         |      |                 |
> > > > > > > +         |      o---->-------------
> > > > > > > +         |
> > > > > > > +          ------------------------------->
> > > > > > > +         (0,0)
> > > > > > > +
> > > > > > > +         (0,0)
> > > > > > > +           ------------------------------->
> > > > > > > +          |
> > > > > > > +          |      o---->-------------
> > > > > > > +          |      |                 |
> > > > > > > +          |      v                 |
> > > > > > > +          |      -------------------
> > > > > > > +          |
> > > > > > > +          V
> > > > > > > +   \endverbatim
> > > > > > > + *
> > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > defined by the
> > > > > > > + * context were the rectangle is used.
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > const SizeRange &sr)
> > > > > > >   /**
> > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > >    * \brief Construct a Rectangle with the given position and
> > size
> > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > >    * \param[in] size The size
> > > > > > > + *
> > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > reference system
> > > > > > > + * origin point (0, 0).
> > > > >
> > > > > I think we should stick to the previous description:
> > > > > `"origin" point defined as the point with the lower x and
> > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > >
> > > > > If we only support coordinates that are positive or 0, which
> > > > > I'm not sure if it's the case, how about making the type to be
> > > > > `unsigned int`?
> > > > >
> > > >
> > > > To be honest I would rather make width and heigh signed to allow
> > > > constructing (x, y, -w, -h)
> > > >
> > > >
> > > >
> > > >
> > > >                -------------------
> > > >                |                 ^
> > > >                |            ------------->
> > > >                |           |     |
> > > >                ------<-----|-----o
> > > >                            |
> > > >                            |
> > > >                            V
> > > >
> > > > Not sure if it's useful or not though
> > > >
> > >
> > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > coordinates?
> > >
> > >
> >
> > Don't know, maybe if the reference system where the rectangle is used
> > into has 4 planes and so an all-negative rectangle makes sense.
> >
> > My point is that we should allow users of this class to express
> > Rectangle in any context they plan to use them. Not sure if I'm going
> > overboard here or it makes sense.
> >
>
> Yeah I agree, while doesn't that mean the description doesn't fit all
> cases, like the corner closer to the reference system origin point of a
> rectangle that has all negative coordinates is actually the "bottom-right"

This patch aims to remove all references to "top-left" or in general
to any visual reference exactly for that purpose. Or have I forgot any
?

> corner, and currently libcamera::Size only allows non-negative width and
> height [1].

True, Size uses unsigned int. I don't think it's a big deal and I'm
not proposing to introduce a new constructor with signed width and
height now, but my point is that if the need arises we can now do
that.

>
> [1]:
> https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
>
>
> > >
> > >
> > > >
> > > > > BR,
> > > > > Harvey
> > > > >
> > > > >
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > unsigned int height)
> > > > > > >    * \brief Construct a Rectangle with the given position and
> > size
> > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > >    * \param[in] width The width
> > > > > > >    * \param[in] height The height
> > > > > > > + *
> > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > reference system
> > > > > > > + * origin point (0, 0).
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > corner
> > > > located
> > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > corner
> > > > located
> > > > > > >    * at (0,0)
> > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > + *
> > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > reference system
> > > > > > > + * origin point (0, 0).
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > >    * \var Rectangle::x
> > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > corner
> > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > corner
> > > > > > > + *
> > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > reference system
> > > > > > > + * origin point (0, 0).
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > >    * \var Rectangle::y
> > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > corner
> > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > corner
> > > > > > > + *
> > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > reference system
> > > > > > > + * origin point (0, 0).
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > this
> > > > Rectangle
> > > > > > > - * \return The Rectangle's top left corner
> > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > Rectangle
> > > > > > > + *
> > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > reference system
> > > > > > > + * origin point (0, 0).
> > > > > > > + *
> > > > > > > + * \return The Rectangle's origin corner
> > > > > >
> > > > > > I think you can drop "corner" from "origin corner"
> > > > > >
> > > > > > Probably throughout the patch:
> > > > > >      s/origin corner/origin/
> > > > > >
> > > > > > Otherwise, LGTM
> > > > > >
> > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > >    */
> > > > > > >
> > > > > > >   /**
> > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > Point
> > > > &point)
> > > > > > >    */
> > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > >   {
> > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > bound.width);
> > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > bound.height);
> > > > > > >
> > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > 0);
> > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > 0);
> > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > 0);
> > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > 0);
> > > > > > >
> > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > >   }
> > > > > > >
> > > > > > >   /**
> > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > Rectangle &ispCrop) const
> > > > > > >        */
> > > > > > >       Rectangle nativeCrop =
> > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > >
> > > >  sensorInfo_.outputSize);
> > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > >       return nativeCrop;
> > > > > > >   }
> > > > > > >
> > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > ControlList &controls)
> > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > >
> > > > > > >               /* Create a version of the crop scaled to ISP
> > (camera
> > > > mode) pixels. */
> > > > > > > -             Rectangle ispCrop =
> > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > +             Rectangle ispCrop =
> > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > sensorInfo_.analogCrop.size());
> > > > > > >
> > > > > > >               /*
> > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > >               .def_property_readonly("is_null",
> > &Rectangle::isNull)
> > > > > > >               .def_property_readonly("center",
> > &Rectangle::center)
> > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > -             .def_property_readonly("topLeft",
> > &Rectangle::topLeft)
> > > > > > > +             .def_property_readonly("origin",
> > &Rectangle::origin)
> > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > --- a/test/geometry.cpp
> > > > > > > +++ b/test/geometry.cpp
> > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > >                       return TestFail;
> > > > > > >               }
> > > > > > >
> > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > Rectangle::center() tests */
> > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > Rectangle::center() tests */
> > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > Size(100000, 200000)) {
> > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > endl;
> > > > > > >                       return TestFail;
> > > > > > >               }
> > > > > > >
> > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > ||
> > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > -2)) {
> > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > <<
> > > > endl;
> > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > ||
> > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > -2))
> > > > {
> > > > > > > +                     cout << "Rectangle::origin() test failed"
> > <<
> > > > endl;
> > > > > > >                       return TestFail;
> > > > > > >               }
> > > > > > >
> > > > > > > --
> > > > > > > 2.46.1
> > > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > --
> > > > > BR,
> > > > > Harvey Yang
> > > >
> >

Hi Jacopo,

On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
<jacopo.mondi@ideasonboard.com> wrote:
>
> Hi Harvey
>
> On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > Hi Jacopo,
> >
> >
> >
> > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > wrote:
> >
> > > Hi Harvey
> > >
> > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > Hi Jacopo,
> > > >
> > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > jacopo.mondi@ideasonboard.com>
> > > > wrote:
> > > >
> > > > > Hi Harvey
> > > > >
> > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > Hi Jacopo,
> > > > > >
> > > > > > Thank you for the patch.
> > > > > >
> > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > umang.jain@ideasonboard.com>
> > > > > wrote:
> > > > > > >
> > > > > > > Hi Jacopo
> > > > > > >
> > > > > > > Thank you for the patch
> > > > > > >
> > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > >
> > > > > > > > However the class documentation assumes the reference system
> > > origin
> > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > >
> > > > > > > > However this is ambiguous when using a different reference
> > > system as,
> > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > following
> > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > require
> > > > > > > > a negative decrement along the y-axis.
> > > > > > > >
> > > > > > > >           ^
> > > > > > > >           |
> > > > > > > >          y|      o------------------
> > > > > > > >           |      |                 | h
> > > > > > > >           |      |                 |
> > > > > > > >           |      -------------------
> > > > > > > >           |               w
> > > > > > > >            ------------------------------->
> > > > > > > >           (0,0)  x
> > > > > > > >
> > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > corner
> > > > > and
> > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > reference system origin point, and specify the horizontal and
> > > > > vertical
> > > > > > > > dimensions always increment along their respective axis, as in
> > > the
> > > > > > > > following example.
> > > > > > > >
> > > > > > > >           ^
> > > > > > > >           |
> > > > > > > >           |      -------------------
> > > > > > > >           |      ^                 | h
> > > > > > > >           |      |                 |
> > > > > > > >          y|      o---->-------------
> > > > > > > >           |               w
> > > > > > > >            ------------------------------->
> > > > > > > >           (0,0)  x
> > > > > > > >
> > > > > > > >           (0,0)  x
> > > > > > > >             ------------------------------>
> > > > > > > >            |              w
> > > > > > > >           y|     o---->-------------
> > > > > > > >            |     |                 | h
> > > > > > > >            |     v                 |
> > > > > > > >            |     -------------------
> > > > > > > >            |
> > > > > > > >            V
> > > > > > > >
> > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > >
> > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > ---
> > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > ++++++++++++++-----
> > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > >
> > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > b/include/libcamera/geometry.h
> > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > >               return { width, height };
> > > > > > > >       }
> > > > > > > >
> > > > > > > > -     Point topLeft() const
> > > > > > > > +     Point origin() const
> > > > > > > >       {
> > > > > > > >               return { x, y };
> > > > > > > >       }
> > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > IPAConfigInfo &configInfo)
> > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > >        */
> > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > +     Point start = roi.origin();
> > > > > > > >
> > > > > > > >       /* x_start and y_start should be even */
> > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > b/src/libcamera/geometry.cpp
> > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > const SizeRange &sr)
> > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > >    *
> > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > are
> > > > > specified by
> > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > vertical size.
> > > > > > > > + * the coordinates of the corner closer to the reference
> > > system's
> > > > > origin point
> > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > >    *
> > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > well
> > > > > as the
> > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > displacements
> > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > + * The corner closer to the reference system's origin point is
> > > the
> > > > > rectangle's
> > > > > > > > + * origin corner.
> > > > > > > > + *
> > > > > > > > + * \verbatim
> > > > > > > > +
> > > > > > > > +  o = origin corner
> > > > > > > > +
> > > > > > > > +         ^
> > > > > > > > +         |
> > > > > > > > +         |      -------------------
> > > > > > > > +         |      ^                 |
> > > > > > > > +         |      |                 |
> > > > > > > > +         |      o---->-------------
> > > > > > > > +         |
> > > > > > > > +          ------------------------------->
> > > > > > > > +         (0,0)
> > > > > > > > +
> > > > > > > > +         (0,0)
> > > > > > > > +           ------------------------------->
> > > > > > > > +          |
> > > > > > > > +          |      o---->-------------
> > > > > > > > +          |      |                 |
> > > > > > > > +          |      v                 |
> > > > > > > > +          |      -------------------
> > > > > > > > +          |
> > > > > > > > +          V
> > > > > > > > +   \endverbatim
> > > > > > > > + *
> > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > defined by the
> > > > > > > > + * context were the rectangle is used.
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > const SizeRange &sr)
> > > > > > > >   /**
> > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > size
> > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > >    * \param[in] size The size
> > > > > > > > + *
> > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > reference system
> > > > > > > > + * origin point (0, 0).
> > > > > >
> > > > > > I think we should stick to the previous description:
> > > > > > `"origin" point defined as the point with the lower x and
> > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > >
> > > > > > If we only support coordinates that are positive or 0, which
> > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > `unsigned int`?
> > > > > >
> > > > >
> > > > > To be honest I would rather make width and heigh signed to allow
> > > > > constructing (x, y, -w, -h)
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >                -------------------
> > > > >                |                 ^
> > > > >                |            ------------->
> > > > >                |           |     |
> > > > >                ------<-----|-----o
> > > > >                            |
> > > > >                            |
> > > > >                            V
> > > > >
> > > > > Not sure if it's useful or not though
> > > > >
> > > >
> > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > coordinates?
> > > >
> > > >
> > >
> > > Don't know, maybe if the reference system where the rectangle is used
> > > into has 4 planes and so an all-negative rectangle makes sense.
> > >
> > > My point is that we should allow users of this class to express
> > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > overboard here or it makes sense.
> > >
> >
> > Yeah I agree, while doesn't that mean the description doesn't fit all
> > cases, like the corner closer to the reference system origin point of a
> > rectangle that has all negative coordinates is actually the "bottom-right"
>
> This patch aims to remove all references to "top-left" or in general
> to any visual reference exactly for that purpose. Or have I forgot any
> ?

In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
the description of `x` and `y` are updated to "coordinates of the origin
corner", where the origin corner is "the corner closer to the reference
system origin point (0, 0)."

As currently libcamera::Size takes only non-negative width and height,
take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
can find that the only valid way to construct this rectangle as
libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
doesn't fit with your updated description, as the corner closer to the
reference system origin point (0, 0) is actually (-1, -1), instead of
(-3, -3).

>
> > corner, and currently libcamera::Size only allows non-negative width and
> > height [1].
>
> True, Size uses unsigned int. I don't think it's a big deal and I'm
> not proposing to introduce a new constructor with signed width and
> height now, but my point is that if the need arises we can now do
> that.
>
> >
> > [1]:
> > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> >
> >
> > > >
> > > >
> > > > >
> > > > > > BR,
> > > > > > Harvey
> > > > > >
> > > > > >
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > unsigned int height)
> > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > size
> > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > >    * \param[in] width The width
> > > > > > > >    * \param[in] height The height
> > > > > > > > + *
> > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > reference system
> > > > > > > > + * origin point (0, 0).
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > corner
> > > > > located
> > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > corner
> > > > > located
> > > > > > > >    * at (0,0)
> > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > + *
> > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > reference system
> > > > > > > > + * origin point (0, 0).
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > >    * \var Rectangle::x
> > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > corner
> > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > corner
> > > > > > > > + *
> > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > reference system
> > > > > > > > + * origin point (0, 0).
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > >    * \var Rectangle::y
> > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > corner
> > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > corner
> > > > > > > > + *
> > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > reference system
> > > > > > > > + * origin point (0, 0).
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > this
> > > > > Rectangle
> > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > Rectangle
> > > > > > > > + *
> > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > reference system
> > > > > > > > + * origin point (0, 0).
> > > > > > > > + *
> > > > > > > > + * \return The Rectangle's origin corner
> > > > > > >
> > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > >
> > > > > > > Probably throughout the patch:
> > > > > > >      s/origin corner/origin/
> > > > > > >
> > > > > > > Otherwise, LGTM
> > > > > > >
> > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > >    */
> > > > > > > >
> > > > > > > >   /**
> > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > Point
> > > > > &point)
> > > > > > > >    */
> > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > >   {
> > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > bound.width);
> > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > bound.height);
> > > > > > > >
> > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > 0);
> > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > 0);
> > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > 0);
> > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > 0);
> > > > > > > >
> > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > >   }
> > > > > > > >
> > > > > > > >   /**
> > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > Rectangle &ispCrop) const
> > > > > > > >        */
> > > > > > > >       Rectangle nativeCrop =
> > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > >
> > > > >  sensorInfo_.outputSize);
> > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > >       return nativeCrop;
> > > > > > > >   }
> > > > > > > >
> > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > ControlList &controls)
> > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > >
> > > > > > > >               /* Create a version of the crop scaled to ISP
> > > (camera
> > > > > mode) pixels. */
> > > > > > > > -             Rectangle ispCrop =
> > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > +             Rectangle ispCrop =
> > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > sensorInfo_.analogCrop.size());
> > > > > > > >
> > > > > > > >               /*
> > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > >               .def_property_readonly("is_null",
> > > &Rectangle::isNull)
> > > > > > > >               .def_property_readonly("center",
> > > &Rectangle::center)
> > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > -             .def_property_readonly("topLeft",
> > > &Rectangle::topLeft)
> > > > > > > > +             .def_property_readonly("origin",
> > > &Rectangle::origin)
> > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > --- a/test/geometry.cpp
> > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > >                       return TestFail;
> > > > > > > >               }
> > > > > > > >
> > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > Rectangle::center() tests */
> > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > Rectangle::center() tests */
> > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > Size(100000, 200000)) {
> > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > endl;
> > > > > > > >                       return TestFail;
> > > > > > > >               }
> > > > > > > >
> > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > ||
> > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > -2)) {
> > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > <<
> > > > > endl;
> > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > ||
> > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > -2))
> > > > > {
> > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > <<
> > > > > endl;
> > > > > > > >                       return TestFail;
> > > > > > > >               }
> > > > > > > >
> > > > > > > > --
> > > > > > > > 2.46.1
> > > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > BR,
> > > > > > Harvey Yang
> > > > >
> > >

Hi Harvey

On Thu, Sep 26, 2024 at 10:03:55PM GMT, Cheng-Hao Yang wrote:
> Hi Jacopo,
>
> On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
> <jacopo.mondi@ideasonboard.com> wrote:
> >
> > Hi Harvey
> >
> > On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > > Hi Jacopo,
> > >
> > >
> > >
> > > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > wrote:
> > >
> > > > Hi Harvey
> > > >
> > > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > > Hi Jacopo,
> > > > >
> > > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > > jacopo.mondi@ideasonboard.com>
> > > > > wrote:
> > > > >
> > > > > > Hi Harvey
> > > > > >
> > > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > > Hi Jacopo,
> > > > > > >
> > > > > > > Thank you for the patch.
> > > > > > >
> > > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > > umang.jain@ideasonboard.com>
> > > > > > wrote:
> > > > > > > >
> > > > > > > > Hi Jacopo
> > > > > > > >
> > > > > > > > Thank you for the patch
> > > > > > > >
> > > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > > >
> > > > > > > > > However the class documentation assumes the reference system
> > > > origin
> > > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > > >
> > > > > > > > > However this is ambiguous when using a different reference
> > > > system as,
> > > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > > following
> > > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > > require
> > > > > > > > > a negative decrement along the y-axis.
> > > > > > > > >
> > > > > > > > >           ^
> > > > > > > > >           |
> > > > > > > > >          y|      o------------------
> > > > > > > > >           |      |                 | h
> > > > > > > > >           |      |                 |
> > > > > > > > >           |      -------------------
> > > > > > > > >           |               w
> > > > > > > > >            ------------------------------->
> > > > > > > > >           (0,0)  x
> > > > > > > > >
> > > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > > corner
> > > > > > and
> > > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > > reference system origin point, and specify the horizontal and
> > > > > > vertical
> > > > > > > > > dimensions always increment along their respective axis, as in
> > > > the
> > > > > > > > > following example.
> > > > > > > > >
> > > > > > > > >           ^
> > > > > > > > >           |
> > > > > > > > >           |      -------------------
> > > > > > > > >           |      ^                 | h
> > > > > > > > >           |      |                 |
> > > > > > > > >          y|      o---->-------------
> > > > > > > > >           |               w
> > > > > > > > >            ------------------------------->
> > > > > > > > >           (0,0)  x
> > > > > > > > >
> > > > > > > > >           (0,0)  x
> > > > > > > > >             ------------------------------>
> > > > > > > > >            |              w
> > > > > > > > >           y|     o---->-------------
> > > > > > > > >            |     |                 | h
> > > > > > > > >            |     v                 |
> > > > > > > > >            |     -------------------
> > > > > > > > >            |
> > > > > > > > >            V
> > > > > > > > >
> > > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > > >
> > > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > ---
> > > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > > ++++++++++++++-----
> > > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > > >
> > > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > > b/include/libcamera/geometry.h
> > > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > > >               return { width, height };
> > > > > > > > >       }
> > > > > > > > >
> > > > > > > > > -     Point topLeft() const
> > > > > > > > > +     Point origin() const
> > > > > > > > >       {
> > > > > > > > >               return { x, y };
> > > > > > > > >       }
> > > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > > IPAConfigInfo &configInfo)
> > > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > > >        */
> > > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > > +     Point start = roi.origin();
> > > > > > > > >
> > > > > > > > >       /* x_start and y_start should be even */
> > > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > > b/src/libcamera/geometry.cpp
> > > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > const SizeRange &sr)
> > > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > > >    *
> > > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > > are
> > > > > > specified by
> > > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > > vertical size.
> > > > > > > > > + * the coordinates of the corner closer to the reference
> > > > system's
> > > > > > origin point
> > > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > > >    *
> > > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > > well
> > > > > > as the
> > > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > > displacements
> > > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > > + * The corner closer to the reference system's origin point is
> > > > the
> > > > > > rectangle's
> > > > > > > > > + * origin corner.
> > > > > > > > > + *
> > > > > > > > > + * \verbatim
> > > > > > > > > +
> > > > > > > > > +  o = origin corner
> > > > > > > > > +
> > > > > > > > > +         ^
> > > > > > > > > +         |
> > > > > > > > > +         |      -------------------
> > > > > > > > > +         |      ^                 |
> > > > > > > > > +         |      |                 |
> > > > > > > > > +         |      o---->-------------
> > > > > > > > > +         |
> > > > > > > > > +          ------------------------------->
> > > > > > > > > +         (0,0)
> > > > > > > > > +
> > > > > > > > > +         (0,0)
> > > > > > > > > +           ------------------------------->
> > > > > > > > > +          |
> > > > > > > > > +          |      o---->-------------
> > > > > > > > > +          |      |                 |
> > > > > > > > > +          |      v                 |
> > > > > > > > > +          |      -------------------
> > > > > > > > > +          |
> > > > > > > > > +          V
> > > > > > > > > +   \endverbatim
> > > > > > > > > + *
> > > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > > defined by the
> > > > > > > > > + * context were the rectangle is used.
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > const SizeRange &sr)
> > > > > > > > >   /**
> > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > size
> > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > >    * \param[in] size The size
> > > > > > > > > + *
> > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > reference system
> > > > > > > > > + * origin point (0, 0).
> > > > > > >
> > > > > > > I think we should stick to the previous description:
> > > > > > > `"origin" point defined as the point with the lower x and
> > > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > > >
> > > > > > > If we only support coordinates that are positive or 0, which
> > > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > > `unsigned int`?
> > > > > > >
> > > > > >
> > > > > > To be honest I would rather make width and heigh signed to allow
> > > > > > constructing (x, y, -w, -h)
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >                -------------------
> > > > > >                |                 ^
> > > > > >                |            ------------->
> > > > > >                |           |     |
> > > > > >                ------<-----|-----o
> > > > > >                            |
> > > > > >                            |
> > > > > >                            V
> > > > > >
> > > > > > Not sure if it's useful or not though
> > > > > >
> > > > >
> > > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > > coordinates?
> > > > >
> > > > >
> > > >
> > > > Don't know, maybe if the reference system where the rectangle is used
> > > > into has 4 planes and so an all-negative rectangle makes sense.
> > > >
> > > > My point is that we should allow users of this class to express
> > > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > > overboard here or it makes sense.
> > > >
> > >
> > > Yeah I agree, while doesn't that mean the description doesn't fit all
> > > cases, like the corner closer to the reference system origin point of a
> > > rectangle that has all negative coordinates is actually the "bottom-right"
> >
> > This patch aims to remove all references to "top-left" or in general
> > to any visual reference exactly for that purpose. Or have I forgot any
> > ?
>
> In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
> the description of `x` and `y` are updated to "coordinates of the origin
> corner", where the origin corner is "the corner closer to the reference
> system origin point (0, 0)."
>
> As currently libcamera::Size takes only non-negative width and height,
> take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
> can find that the only valid way to construct this rectangle as
> libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
> doesn't fit with your updated description, as the corner closer to the
> reference system origin point (0, 0) is actually (-1, -1), instead of
> (-3, -3).
>

You're right. Let's take a step back though. If we have a 4 planes reference
system, we always have a visual top-left indeed. As the 4 planes have
negative and positive coordinates, we can describe with absolute
positions the rectangle and all points in the system.

The problem at hands now is relevant for 1-planes reference systems,
that can be oriented differently, in example with the origin point
being in top-left or bottom-left positions, as per the examples above.
In this case I think we agree that "top-left" is ambiguous. The x and
y coordinates are always positive in the case with a single plane.

I think we should also be concerned with 1 plane reference systems and
move forward with this patch that removes references to the visual
"top-left" and assumes increments in width and height are always
positive.

> >
> > > corner, and currently libcamera::Size only allows non-negative width and
> > > height [1].
> >
> > True, Size uses unsigned int. I don't think it's a big deal and I'm
> > not proposing to introduce a new constructor with signed width and
> > height now, but my point is that if the need arises we can now do
> > that.
> >
> > >
> > > [1]:
> > > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> > >
> > >
> > > > >
> > > > >
> > > > > >
> > > > > > > BR,
> > > > > > > Harvey
> > > > > > >
> > > > > > >
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > > unsigned int height)
> > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > size
> > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > >    * \param[in] width The width
> > > > > > > > >    * \param[in] height The height
> > > > > > > > > + *
> > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > reference system
> > > > > > > > > + * origin point (0, 0).
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > > corner
> > > > > > located
> > > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > > corner
> > > > > > located
> > > > > > > > >    * at (0,0)
> > > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > > + *
> > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > reference system
> > > > > > > > > + * origin point (0, 0).
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > >    * \var Rectangle::x
> > > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > > corner
> > > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > > corner
> > > > > > > > > + *
> > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > reference system
> > > > > > > > > + * origin point (0, 0).
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > >    * \var Rectangle::y
> > > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > > corner
> > > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > > corner
> > > > > > > > > + *
> > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > reference system
> > > > > > > > > + * origin point (0, 0).
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > > this
> > > > > > Rectangle
> > > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > > Rectangle
> > > > > > > > > + *
> > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > reference system
> > > > > > > > > + * origin point (0, 0).
> > > > > > > > > + *
> > > > > > > > > + * \return The Rectangle's origin corner
> > > > > > > >
> > > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > > >
> > > > > > > > Probably throughout the patch:
> > > > > > > >      s/origin corner/origin/
> > > > > > > >
> > > > > > > > Otherwise, LGTM
> > > > > > > >
> > > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > > >    */
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > > Point
> > > > > > &point)
> > > > > > > > >    */
> > > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > > >   {
> > > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > > bound.width);
> > > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > > bound.height);
> > > > > > > > >
> > > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > > 0);
> > > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > > 0);
> > > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > > 0);
> > > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > > 0);
> > > > > > > > >
> > > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > > >   }
> > > > > > > > >
> > > > > > > > >   /**
> > > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > > Rectangle &ispCrop) const
> > > > > > > > >        */
> > > > > > > > >       Rectangle nativeCrop =
> > > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > > >
> > > > > >  sensorInfo_.outputSize);
> > > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > > >       return nativeCrop;
> > > > > > > > >   }
> > > > > > > > >
> > > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > > ControlList &controls)
> > > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > > >
> > > > > > > > >               /* Create a version of the crop scaled to ISP
> > > > (camera
> > > > > > mode) pixels. */
> > > > > > > > > -             Rectangle ispCrop =
> > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > > +             Rectangle ispCrop =
> > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > > sensorInfo_.analogCrop.size());
> > > > > > > > >
> > > > > > > > >               /*
> > > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > > >               .def_property_readonly("is_null",
> > > > &Rectangle::isNull)
> > > > > > > > >               .def_property_readonly("center",
> > > > &Rectangle::center)
> > > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > > -             .def_property_readonly("topLeft",
> > > > &Rectangle::topLeft)
> > > > > > > > > +             .def_property_readonly("origin",
> > > > &Rectangle::origin)
> > > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > > --- a/test/geometry.cpp
> > > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > > >                       return TestFail;
> > > > > > > > >               }
> > > > > > > > >
> > > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > > Rectangle::center() tests */
> > > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > > Rectangle::center() tests */
> > > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > > Size(100000, 200000)) {
> > > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > > endl;
> > > > > > > > >                       return TestFail;
> > > > > > > > >               }
> > > > > > > > >
> > > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > > ||
> > > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > > -2)) {
> > > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > > <<
> > > > > > endl;
> > > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > > ||
> > > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > > -2))
> > > > > > {
> > > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > > <<
> > > > > > endl;
> > > > > > > > >                       return TestFail;
> > > > > > > > >               }
> > > > > > > > >
> > > > > > > > > --
> > > > > > > > > 2.46.1
> > > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > --
> > > > > > > BR,
> > > > > > > Harvey Yang
> > > > > >
> > > >
>
>
>
> --
> BR,
> Harvey Yang

Hi Jacopo,

On Thu, Sep 26, 2024 at 10:35 PM Jacopo Mondi
<jacopo.mondi@ideasonboard.com> wrote:
>
> Hi Harvey
>
> On Thu, Sep 26, 2024 at 10:03:55PM GMT, Cheng-Hao Yang wrote:
> > Hi Jacopo,
> >
> > On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
> > <jacopo.mondi@ideasonboard.com> wrote:
> > >
> > > Hi Harvey
> > >
> > > On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > > > Hi Jacopo,
> > > >
> > > >
> > > >
> > > > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > wrote:
> > > >
> > > > > Hi Harvey
> > > > >
> > > > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > > > Hi Jacopo,
> > > > > >
> > > > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > > > jacopo.mondi@ideasonboard.com>
> > > > > > wrote:
> > > > > >
> > > > > > > Hi Harvey
> > > > > > >
> > > > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > Hi Jacopo,
> > > > > > > >
> > > > > > > > Thank you for the patch.
> > > > > > > >
> > > > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > > > umang.jain@ideasonboard.com>
> > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > Hi Jacopo
> > > > > > > > >
> > > > > > > > > Thank you for the patch
> > > > > > > > >
> > > > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > > > >
> > > > > > > > > > However the class documentation assumes the reference system
> > > > > origin
> > > > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > > > >
> > > > > > > > > > However this is ambiguous when using a different reference
> > > > > system as,
> > > > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > > > following
> > > > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > > > require
> > > > > > > > > > a negative decrement along the y-axis.
> > > > > > > > > >
> > > > > > > > > >           ^
> > > > > > > > > >           |
> > > > > > > > > >          y|      o------------------
> > > > > > > > > >           |      |                 | h
> > > > > > > > > >           |      |                 |
> > > > > > > > > >           |      -------------------
> > > > > > > > > >           |               w
> > > > > > > > > >            ------------------------------->
> > > > > > > > > >           (0,0)  x
> > > > > > > > > >
> > > > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > > > corner
> > > > > > > and
> > > > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > > > reference system origin point, and specify the horizontal and
> > > > > > > vertical
> > > > > > > > > > dimensions always increment along their respective axis, as in
> > > > > the
> > > > > > > > > > following example.
> > > > > > > > > >
> > > > > > > > > >           ^
> > > > > > > > > >           |
> > > > > > > > > >           |      -------------------
> > > > > > > > > >           |      ^                 | h
> > > > > > > > > >           |      |                 |
> > > > > > > > > >          y|      o---->-------------
> > > > > > > > > >           |               w
> > > > > > > > > >            ------------------------------->
> > > > > > > > > >           (0,0)  x
> > > > > > > > > >
> > > > > > > > > >           (0,0)  x
> > > > > > > > > >             ------------------------------>
> > > > > > > > > >            |              w
> > > > > > > > > >           y|     o---->-------------
> > > > > > > > > >            |     |                 | h
> > > > > > > > > >            |     v                 |
> > > > > > > > > >            |     -------------------
> > > > > > > > > >            |
> > > > > > > > > >            V
> > > > > > > > > >
> > > > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > > > >
> > > > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > > ---
> > > > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > > > ++++++++++++++-----
> > > > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > > > >
> > > > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > > > b/include/libcamera/geometry.h
> > > > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > > > >               return { width, height };
> > > > > > > > > >       }
> > > > > > > > > >
> > > > > > > > > > -     Point topLeft() const
> > > > > > > > > > +     Point origin() const
> > > > > > > > > >       {
> > > > > > > > > >               return { x, y };
> > > > > > > > > >       }
> > > > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > > > IPAConfigInfo &configInfo)
> > > > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > > > >        */
> > > > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > > > +     Point start = roi.origin();
> > > > > > > > > >
> > > > > > > > > >       /* x_start and y_start should be even */
> > > > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > > > b/src/libcamera/geometry.cpp
> > > > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > const SizeRange &sr)
> > > > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > > > >    *
> > > > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > > > are
> > > > > > > specified by
> > > > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > > > vertical size.
> > > > > > > > > > + * the coordinates of the corner closer to the reference
> > > > > system's
> > > > > > > origin point
> > > > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > > > >    *
> > > > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > > > well
> > > > > > > as the
> > > > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > > > displacements
> > > > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > > > + * The corner closer to the reference system's origin point is
> > > > > the
> > > > > > > rectangle's
> > > > > > > > > > + * origin corner.
> > > > > > > > > > + *
> > > > > > > > > > + * \verbatim
> > > > > > > > > > +
> > > > > > > > > > +  o = origin corner
> > > > > > > > > > +
> > > > > > > > > > +         ^
> > > > > > > > > > +         |
> > > > > > > > > > +         |      -------------------
> > > > > > > > > > +         |      ^                 |
> > > > > > > > > > +         |      |                 |
> > > > > > > > > > +         |      o---->-------------
> > > > > > > > > > +         |
> > > > > > > > > > +          ------------------------------->
> > > > > > > > > > +         (0,0)
> > > > > > > > > > +
> > > > > > > > > > +         (0,0)
> > > > > > > > > > +           ------------------------------->
> > > > > > > > > > +          |
> > > > > > > > > > +          |      o---->-------------
> > > > > > > > > > +          |      |                 |
> > > > > > > > > > +          |      v                 |
> > > > > > > > > > +          |      -------------------
> > > > > > > > > > +          |
> > > > > > > > > > +          V
> > > > > > > > > > +   \endverbatim
> > > > > > > > > > + *
> > > > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > > > defined by the
> > > > > > > > > > + * context were the rectangle is used.
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > const SizeRange &sr)
> > > > > > > > > >   /**
> > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > size
> > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > >    * \param[in] size The size
> > > > > > > > > > + *
> > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > reference system
> > > > > > > > > > + * origin point (0, 0).
> > > > > > > >
> > > > > > > > I think we should stick to the previous description:
> > > > > > > > `"origin" point defined as the point with the lower x and
> > > > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > > > >
> > > > > > > > If we only support coordinates that are positive or 0, which
> > > > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > > > `unsigned int`?
> > > > > > > >
> > > > > > >
> > > > > > > To be honest I would rather make width and heigh signed to allow
> > > > > > > constructing (x, y, -w, -h)
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >                -------------------
> > > > > > >                |                 ^
> > > > > > >                |            ------------->
> > > > > > >                |           |     |
> > > > > > >                ------<-----|-----o
> > > > > > >                            |
> > > > > > >                            |
> > > > > > >                            V
> > > > > > >
> > > > > > > Not sure if it's useful or not though
> > > > > > >
> > > > > >
> > > > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > > > coordinates?
> > > > > >
> > > > > >
> > > > >
> > > > > Don't know, maybe if the reference system where the rectangle is used
> > > > > into has 4 planes and so an all-negative rectangle makes sense.
> > > > >
> > > > > My point is that we should allow users of this class to express
> > > > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > > > overboard here or it makes sense.
> > > > >
> > > >
> > > > Yeah I agree, while doesn't that mean the description doesn't fit all
> > > > cases, like the corner closer to the reference system origin point of a
> > > > rectangle that has all negative coordinates is actually the "bottom-right"
> > >
> > > This patch aims to remove all references to "top-left" or in general
> > > to any visual reference exactly for that purpose. Or have I forgot any
> > > ?
> >
> > In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
> > the description of `x` and `y` are updated to "coordinates of the origin
> > corner", where the origin corner is "the corner closer to the reference
> > system origin point (0, 0)."
> >
> > As currently libcamera::Size takes only non-negative width and height,
> > take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
> > can find that the only valid way to construct this rectangle as
> > libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
> > doesn't fit with your updated description, as the corner closer to the
> > reference system origin point (0, 0) is actually (-1, -1), instead of
> > (-3, -3).
> >
>
> You're right. Let's take a step back though. If we have a 4 planes reference
> system, we always have a visual top-left indeed. As the 4 planes have
> negative and positive coordinates, we can describe with absolute
> positions the rectangle and all points in the system.

Sorry, I still don't get your point...

Do you mean that the new description, like
`The horizontal coordinate of the rectangle's origin corner`,
only fits with the 1-plane reference system? I thought it should fit all
2D reference systems.

>
> The problem at hands now is relevant for 1-planes reference systems,
> that can be oriented differently, in example with the origin point
> being in top-left or bottom-left positions, as per the examples above.
> In this case I think we agree that "top-left" is ambiguous. The x and
> y coordinates are always positive in the case with a single plane.
>
> I think we should also be concerned with 1 plane reference systems and
> move forward with this patch that removes references to the visual
> "top-left" and assumes increments in width and height are always
> positive.
>
> > >
> > > > corner, and currently libcamera::Size only allows non-negative width and
> > > > height [1].
> > >
> > > True, Size uses unsigned int. I don't think it's a big deal and I'm
> > > not proposing to introduce a new constructor with signed width and
> > > height now, but my point is that if the need arises we can now do
> > > that.
> > >
> > > >
> > > > [1]:
> > > > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> > > >
> > > >
> > > > > >
> > > > > >
> > > > > > >
> > > > > > > > BR,
> > > > > > > > Harvey
> > > > > > > >
> > > > > > > >
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > > > unsigned int height)
> > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > size
> > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > >    * \param[in] width The width
> > > > > > > > > >    * \param[in] height The height
> > > > > > > > > > + *
> > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > reference system
> > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > > > corner
> > > > > > > located
> > > > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > > > corner
> > > > > > > located
> > > > > > > > > >    * at (0,0)
> > > > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > > > + *
> > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > reference system
> > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > >    * \var Rectangle::x
> > > > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > > > corner
> > > > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > > > corner
> > > > > > > > > > + *
> > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > reference system
> > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > >    * \var Rectangle::y
> > > > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > > > corner
> > > > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > > > corner
> > > > > > > > > > + *
> > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > reference system
> > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > > > this
> > > > > > > Rectangle
> > > > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > > > Rectangle
> > > > > > > > > > + *
> > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > reference system
> > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > + *
> > > > > > > > > > + * \return The Rectangle's origin corner
> > > > > > > > >
> > > > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > > > >
> > > > > > > > > Probably throughout the patch:
> > > > > > > > >      s/origin corner/origin/
> > > > > > > > >
> > > > > > > > > Otherwise, LGTM
> > > > > > > > >
> > > > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > > > >    */
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > > > Point
> > > > > > > &point)
> > > > > > > > > >    */
> > > > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > > > >   {
> > > > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > > > bound.width);
> > > > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > > > bound.height);
> > > > > > > > > >
> > > > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > > > 0);
> > > > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > > > 0);
> > > > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > > > 0);
> > > > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > > > 0);
> > > > > > > > > >
> > > > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > > > >   }
> > > > > > > > > >
> > > > > > > > > >   /**
> > > > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > > > Rectangle &ispCrop) const
> > > > > > > > > >        */
> > > > > > > > > >       Rectangle nativeCrop =
> > > > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > > > >
> > > > > > >  sensorInfo_.outputSize);
> > > > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > > > >       return nativeCrop;
> > > > > > > > > >   }
> > > > > > > > > >
> > > > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > > > ControlList &controls)
> > > > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > > > >
> > > > > > > > > >               /* Create a version of the crop scaled to ISP
> > > > > (camera
> > > > > > > mode) pixels. */
> > > > > > > > > > -             Rectangle ispCrop =
> > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > +             Rectangle ispCrop =
> > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > > > sensorInfo_.analogCrop.size());
> > > > > > > > > >
> > > > > > > > > >               /*
> > > > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > > > >               .def_property_readonly("is_null",
> > > > > &Rectangle::isNull)
> > > > > > > > > >               .def_property_readonly("center",
> > > > > &Rectangle::center)
> > > > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > > > -             .def_property_readonly("topLeft",
> > > > > &Rectangle::topLeft)
> > > > > > > > > > +             .def_property_readonly("origin",
> > > > > &Rectangle::origin)
> > > > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > > > --- a/test/geometry.cpp
> > > > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > > > >                       return TestFail;
> > > > > > > > > >               }
> > > > > > > > > >
> > > > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > > > Rectangle::center() tests */
> > > > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > > > Rectangle::center() tests */
> > > > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > > > Size(100000, 200000)) {
> > > > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > > > endl;
> > > > > > > > > >                       return TestFail;
> > > > > > > > > >               }
> > > > > > > > > >
> > > > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > > > ||
> > > > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > > > -2)) {
> > > > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > > > <<
> > > > > > > endl;
> > > > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > > > ||
> > > > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > > > -2))
> > > > > > > {
> > > > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > > > <<
> > > > > > > endl;
> > > > > > > > > >                       return TestFail;
> > > > > > > > > >               }
> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > 2.46.1
> > > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > --
> > > > > > > > BR,
> > > > > > > > Harvey Yang
> > > > > > >
> > > > >
> >
> >
> >
> > --
> > BR,
> > Harvey Yang

Hi Harvey

On Thu, Sep 26, 2024 at 11:22:58PM GMT, Cheng-Hao Yang wrote:
> Hi Jacopo,
>
> On Thu, Sep 26, 2024 at 10:35 PM Jacopo Mondi
> <jacopo.mondi@ideasonboard.com> wrote:
> >
> > Hi Harvey
> >
> > On Thu, Sep 26, 2024 at 10:03:55PM GMT, Cheng-Hao Yang wrote:
> > > Hi Jacopo,
> > >
> > > On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
> > > <jacopo.mondi@ideasonboard.com> wrote:
> > > >
> > > > Hi Harvey
> > > >
> > > > On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > > > > Hi Jacopo,
> > > > >
> > > > >
> > > > >
> > > > > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > wrote:
> > > > >
> > > > > > Hi Harvey
> > > > > >
> > > > > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > > > > Hi Jacopo,
> > > > > > >
> > > > > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > > > > jacopo.mondi@ideasonboard.com>
> > > > > > > wrote:
> > > > > > >
> > > > > > > > Hi Harvey
> > > > > > > >
> > > > > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > Hi Jacopo,
> > > > > > > > >
> > > > > > > > > Thank you for the patch.
> > > > > > > > >
> > > > > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > > > > umang.jain@ideasonboard.com>
> > > > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > Hi Jacopo
> > > > > > > > > >
> > > > > > > > > > Thank you for the patch
> > > > > > > > > >
> > > > > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > > > > >
> > > > > > > > > > > However the class documentation assumes the reference system
> > > > > > origin
> > > > > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > > > > >
> > > > > > > > > > > However this is ambiguous when using a different reference
> > > > > > system as,
> > > > > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > > > > following
> > > > > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > > > > require
> > > > > > > > > > > a negative decrement along the y-axis.
> > > > > > > > > > >
> > > > > > > > > > >           ^
> > > > > > > > > > >           |
> > > > > > > > > > >          y|      o------------------
> > > > > > > > > > >           |      |                 | h
> > > > > > > > > > >           |      |                 |
> > > > > > > > > > >           |      -------------------
> > > > > > > > > > >           |               w
> > > > > > > > > > >            ------------------------------->
> > > > > > > > > > >           (0,0)  x
> > > > > > > > > > >
> > > > > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > > > > corner
> > > > > > > > and
> > > > > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > > > > reference system origin point, and specify the horizontal and
> > > > > > > > vertical
> > > > > > > > > > > dimensions always increment along their respective axis, as in
> > > > > > the
> > > > > > > > > > > following example.
> > > > > > > > > > >
> > > > > > > > > > >           ^
> > > > > > > > > > >           |
> > > > > > > > > > >           |      -------------------
> > > > > > > > > > >           |      ^                 | h
> > > > > > > > > > >           |      |                 |
> > > > > > > > > > >          y|      o---->-------------
> > > > > > > > > > >           |               w
> > > > > > > > > > >            ------------------------------->
> > > > > > > > > > >           (0,0)  x
> > > > > > > > > > >
> > > > > > > > > > >           (0,0)  x
> > > > > > > > > > >             ------------------------------>
> > > > > > > > > > >            |              w
> > > > > > > > > > >           y|     o---->-------------
> > > > > > > > > > >            |     |                 | h
> > > > > > > > > > >            |     v                 |
> > > > > > > > > > >            |     -------------------
> > > > > > > > > > >            |
> > > > > > > > > > >            V
> > > > > > > > > > >
> > > > > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > > > > >
> > > > > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > > > ---
> > > > > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > > > > ++++++++++++++-----
> > > > > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > > > > >
> > > > > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > > > > b/include/libcamera/geometry.h
> > > > > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > > > > >               return { width, height };
> > > > > > > > > > >       }
> > > > > > > > > > >
> > > > > > > > > > > -     Point topLeft() const
> > > > > > > > > > > +     Point origin() const
> > > > > > > > > > >       {
> > > > > > > > > > >               return { x, y };
> > > > > > > > > > >       }
> > > > > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > > > > IPAConfigInfo &configInfo)
> > > > > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > > > > >        */
> > > > > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > > > > +     Point start = roi.origin();
> > > > > > > > > > >
> > > > > > > > > > >       /* x_start and y_start should be even */
> > > > > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > > > > b/src/libcamera/geometry.cpp
> > > > > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > const SizeRange &sr)
> > > > > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > > > > >    *
> > > > > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > > > > are
> > > > > > > > specified by
> > > > > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > > > > vertical size.
> > > > > > > > > > > + * the coordinates of the corner closer to the reference
> > > > > > system's
> > > > > > > > origin point
> > > > > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > > > > >    *
> > > > > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > > > > well
> > > > > > > > as the
> > > > > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > > > > displacements
> > > > > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > > > > + * The corner closer to the reference system's origin point is
> > > > > > the
> > > > > > > > rectangle's
> > > > > > > > > > > + * origin corner.
> > > > > > > > > > > + *
> > > > > > > > > > > + * \verbatim
> > > > > > > > > > > +
> > > > > > > > > > > +  o = origin corner
> > > > > > > > > > > +
> > > > > > > > > > > +         ^
> > > > > > > > > > > +         |
> > > > > > > > > > > +         |      -------------------
> > > > > > > > > > > +         |      ^                 |
> > > > > > > > > > > +         |      |                 |
> > > > > > > > > > > +         |      o---->-------------
> > > > > > > > > > > +         |
> > > > > > > > > > > +          ------------------------------->
> > > > > > > > > > > +         (0,0)
> > > > > > > > > > > +
> > > > > > > > > > > +         (0,0)
> > > > > > > > > > > +           ------------------------------->
> > > > > > > > > > > +          |
> > > > > > > > > > > +          |      o---->-------------
> > > > > > > > > > > +          |      |                 |
> > > > > > > > > > > +          |      v                 |
> > > > > > > > > > > +          |      -------------------
> > > > > > > > > > > +          |
> > > > > > > > > > > +          V
> > > > > > > > > > > +   \endverbatim
> > > > > > > > > > > + *
> > > > > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > > > > defined by the
> > > > > > > > > > > + * context were the rectangle is used.
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > const SizeRange &sr)
> > > > > > > > > > >   /**
> > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > size
> > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > >    * \param[in] size The size
> > > > > > > > > > > + *
> > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > reference system
> > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > >
> > > > > > > > > I think we should stick to the previous description:
> > > > > > > > > `"origin" point defined as the point with the lower x and
> > > > > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > > > > >
> > > > > > > > > If we only support coordinates that are positive or 0, which
> > > > > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > > > > `unsigned int`?
> > > > > > > > >
> > > > > > > >
> > > > > > > > To be honest I would rather make width and heigh signed to allow
> > > > > > > > constructing (x, y, -w, -h)
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >                -------------------
> > > > > > > >                |                 ^
> > > > > > > >                |            ------------->
> > > > > > > >                |           |     |
> > > > > > > >                ------<-----|-----o
> > > > > > > >                            |
> > > > > > > >                            |
> > > > > > > >                            V
> > > > > > > >
> > > > > > > > Not sure if it's useful or not though
> > > > > > > >
> > > > > > >
> > > > > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > > > > coordinates?
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > Don't know, maybe if the reference system where the rectangle is used
> > > > > > into has 4 planes and so an all-negative rectangle makes sense.
> > > > > >
> > > > > > My point is that we should allow users of this class to express
> > > > > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > > > > overboard here or it makes sense.
> > > > > >
> > > > >
> > > > > Yeah I agree, while doesn't that mean the description doesn't fit all
> > > > > cases, like the corner closer to the reference system origin point of a
> > > > > rectangle that has all negative coordinates is actually the "bottom-right"
> > > >
> > > > This patch aims to remove all references to "top-left" or in general
> > > > to any visual reference exactly for that purpose. Or have I forgot any
> > > > ?
> > >
> > > In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
> > > the description of `x` and `y` are updated to "coordinates of the origin
> > > corner", where the origin corner is "the corner closer to the reference
> > > system origin point (0, 0)."
> > >
> > > As currently libcamera::Size takes only non-negative width and height,
> > > take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
> > > can find that the only valid way to construct this rectangle as
> > > libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
> > > doesn't fit with your updated description, as the corner closer to the
> > > reference system origin point (0, 0) is actually (-1, -1), instead of
> > > (-3, -3).
> > >
> >
> > You're right. Let's take a step back though. If we have a 4 planes reference
> > system, we always have a visual top-left indeed. As the 4 planes have
> > negative and positive coordinates, we can describe with absolute
> > positions the rectangle and all points in the system.
>
> Sorry, I still don't get your point...
>

If you have a 4 planes system

                      ^
                      |
                      |
                      |
                      |
        <--------------------------->
                      |
                      |
                      |
                      |
                      V

Then you always have a top, a left, and bottom and a right, you can
describe width and height as negative or positive increments and your
rectangle is always well defined as the reference system cannot be
ambiguous. The very concept of "reference system orientation" doesn't
make sense, as a 4-planes system describes the full 2-d space.

The ambiguity I'm trying to solve is about using a 1 plane reference
system, as depending on how the system is oriented the definition of
the "top-left" point might change, as well as the definition of the
horizontal and vertical increments change as well.

In example:

                      ^
                      |
                      |
                      |  o-------
                      |  |      |
                      |  --------
                      |
                      ------------------------>

        top-left: Smaller x and higher y
        width: positive increment
        height: negative increment




                      ------------------------>
                      |  o-------
                      |  |      |
                      |  --------
                      |
                      |
                      V

        top-left: Smaller x and smaller y
        width: positive increment
        height: positive increment


I thought our Rectangle definition didn't make assumptions on the
reference's system orientation and in fact that's what part of the
documentation says, but indeed the usage of "top-left" is, as shown,
ambiguous.

So I went and changed that to be the "corner closer to the origin
point" and specified in documentation that vertical and horizontal
increments are always positive and I thought I was done with this, but
then I made the mistake of talking about negative increments and
4-plane systems and here we are.


> Do you mean that the new description, like
> `The horizontal coordinate of the rectangle's origin corner`,
> only fits with the 1-plane reference system? I thought it should fit all
> 2D reference systems.

I don't think that has never been the case, but indeed we have a
constructor that takes "signed" x and y.

To be honest I would not be concerned about 4-planes systems, we're
talking about imaging and what is relevant here is that we should be
allowed to express rectangles on reference systems that can be
oriented differently, think of a sensor's pixel array that might be
represented with the (0, 0) position in the top-left corner compared
to a plane 2-d image that usually has its origin in the bottom-left
corner.

I have an hard time finding a use case for expressing negative
coordinates in this usage context. Furthermore that if we introduce 4
planes we lose the ability to describe systems with different
orientation, as this:

                      ------------------------>
                      |  o-------
                      |  |      |
                      |  --------
                      |
                      |
                      V

when expressed in a 4-planes system becomes

                      ^
                      |
                      |
                      |
                      |
        <--------------------------->
                      |/////////////
                      |/////////////
                      |// this /////
                      |/////////////
                      |/////////////
                      V

And would require you to express y and height in negative coordinates.
Sincerely, I would not go there.

I can specify that the Rectangle class reference system is always a
2-d plane with positively increasing x and y axes instead.

>
> >
> > The problem at hands now is relevant for 1-planes reference systems,
> > that can be oriented differently, in example with the origin point
> > being in top-left or bottom-left positions, as per the examples above.
> > In this case I think we agree that "top-left" is ambiguous. The x and
> > y coordinates are always positive in the case with a single plane.
> >
> > I think we should also be concerned with 1 plane reference systems and
> > move forward with this patch that removes references to the visual
> > "top-left" and assumes increments in width and height are always
> > positive.
> >
> > > >
> > > > > corner, and currently libcamera::Size only allows non-negative width and
> > > > > height [1].
> > > >
> > > > True, Size uses unsigned int. I don't think it's a big deal and I'm
> > > > not proposing to introduce a new constructor with signed width and
> > > > height now, but my point is that if the need arises we can now do
> > > > that.
> > > >
> > > > >
> > > > > [1]:
> > > > > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> > > > >
> > > > >
> > > > > > >
> > > > > > >
> > > > > > > >
> > > > > > > > > BR,
> > > > > > > > > Harvey
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > > > > unsigned int height)
> > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > size
> > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > >    * \param[in] width The width
> > > > > > > > > > >    * \param[in] height The height
> > > > > > > > > > > + *
> > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > reference system
> > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > > > > corner
> > > > > > > > located
> > > > > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > > > > corner
> > > > > > > > located
> > > > > > > > > > >    * at (0,0)
> > > > > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > > > > + *
> > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > reference system
> > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > >    * \var Rectangle::x
> > > > > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > > > > corner
> > > > > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > > > > corner
> > > > > > > > > > > + *
> > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > reference system
> > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > >    * \var Rectangle::y
> > > > > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > > > > corner
> > > > > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > > > > corner
> > > > > > > > > > > + *
> > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > reference system
> > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > > > > this
> > > > > > > > Rectangle
> > > > > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > > > > Rectangle
> > > > > > > > > > > + *
> > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > reference system
> > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > + *
> > > > > > > > > > > + * \return The Rectangle's origin corner
> > > > > > > > > >
> > > > > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > > > > >
> > > > > > > > > > Probably throughout the patch:
> > > > > > > > > >      s/origin corner/origin/
> > > > > > > > > >
> > > > > > > > > > Otherwise, LGTM
> > > > > > > > > >
> > > > > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > > > > >    */
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > > > > Point
> > > > > > > > &point)
> > > > > > > > > > >    */
> > > > > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > > > > >   {
> > > > > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > > > > bound.width);
> > > > > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > > > > bound.height);
> > > > > > > > > > >
> > > > > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > > > > 0);
> > > > > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > > > > 0);
> > > > > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > > > > 0);
> > > > > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > > > > 0);
> > > > > > > > > > >
> > > > > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > > > > >   }
> > > > > > > > > > >
> > > > > > > > > > >   /**
> > > > > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > > > > Rectangle &ispCrop) const
> > > > > > > > > > >        */
> > > > > > > > > > >       Rectangle nativeCrop =
> > > > > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > > > > >
> > > > > > > >  sensorInfo_.outputSize);
> > > > > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > > > > >       return nativeCrop;
> > > > > > > > > > >   }
> > > > > > > > > > >
> > > > > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > > > > ControlList &controls)
> > > > > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > > > > >
> > > > > > > > > > >               /* Create a version of the crop scaled to ISP
> > > > > > (camera
> > > > > > > > mode) pixels. */
> > > > > > > > > > > -             Rectangle ispCrop =
> > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > +             Rectangle ispCrop =
> > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > > > > sensorInfo_.analogCrop.size());
> > > > > > > > > > >
> > > > > > > > > > >               /*
> > > > > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > > > > >               .def_property_readonly("is_null",
> > > > > > &Rectangle::isNull)
> > > > > > > > > > >               .def_property_readonly("center",
> > > > > > &Rectangle::center)
> > > > > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > > > > -             .def_property_readonly("topLeft",
> > > > > > &Rectangle::topLeft)
> > > > > > > > > > > +             .def_property_readonly("origin",
> > > > > > &Rectangle::origin)
> > > > > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > > > > --- a/test/geometry.cpp
> > > > > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > > > > >                       return TestFail;
> > > > > > > > > > >               }
> > > > > > > > > > >
> > > > > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > > > > Rectangle::center() tests */
> > > > > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > > > > Size(100000, 200000)) {
> > > > > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > > > > endl;
> > > > > > > > > > >                       return TestFail;
> > > > > > > > > > >               }
> > > > > > > > > > >
> > > > > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > > > > ||
> > > > > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > > > > -2)) {
> > > > > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > > > > <<
> > > > > > > > endl;
> > > > > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > > > > ||
> > > > > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > > > > -2))
> > > > > > > > {
> > > > > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > > > > <<
> > > > > > > > endl;
> > > > > > > > > > >                       return TestFail;
> > > > > > > > > > >               }
> > > > > > > > > > >
> > > > > > > > > > > --
> > > > > > > > > > > 2.46.1
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > --
> > > > > > > > > BR,
> > > > > > > > > Harvey Yang
> > > > > > > >
> > > > > >
> > >
> > >
> > >
> > > --
> > > BR,
> > > Harvey Yang
>
>
>
> --
> BR,
> Harvey Yang

Hi Jacopo,

On Fri, Sep 27, 2024 at 4:05 PM Jacopo Mondi
<jacopo.mondi@ideasonboard.com> wrote:
>
> Hi Harvey
>
> On Thu, Sep 26, 2024 at 11:22:58PM GMT, Cheng-Hao Yang wrote:
> > Hi Jacopo,
> >
> > On Thu, Sep 26, 2024 at 10:35 PM Jacopo Mondi
> > <jacopo.mondi@ideasonboard.com> wrote:
> > >
> > > Hi Harvey
> > >
> > > On Thu, Sep 26, 2024 at 10:03:55PM GMT, Cheng-Hao Yang wrote:
> > > > Hi Jacopo,
> > > >
> > > > On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
> > > > <jacopo.mondi@ideasonboard.com> wrote:
> > > > >
> > > > > Hi Harvey
> > > > >
> > > > > On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > > > > > Hi Jacopo,
> > > > > >
> > > > > >
> > > > > >
> > > > > > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > wrote:
> > > > > >
> > > > > > > Hi Harvey
> > > > > > >
> > > > > > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > Hi Jacopo,
> > > > > > > >
> > > > > > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > > > > > jacopo.mondi@ideasonboard.com>
> > > > > > > > wrote:
> > > > > > > >
> > > > > > > > > Hi Harvey
> > > > > > > > >
> > > > > > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > > Hi Jacopo,
> > > > > > > > > >
> > > > > > > > > > Thank you for the patch.
> > > > > > > > > >
> > > > > > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > > > > > umang.jain@ideasonboard.com>
> > > > > > > > > wrote:
> > > > > > > > > > >
> > > > > > > > > > > Hi Jacopo
> > > > > > > > > > >
> > > > > > > > > > > Thank you for the patch
> > > > > > > > > > >
> > > > > > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > > > > > >
> > > > > > > > > > > > However the class documentation assumes the reference system
> > > > > > > origin
> > > > > > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > > > > > >
> > > > > > > > > > > > However this is ambiguous when using a different reference
> > > > > > > system as,
> > > > > > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > > > > > following
> > > > > > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > > > > > require
> > > > > > > > > > > > a negative decrement along the y-axis.
> > > > > > > > > > > >
> > > > > > > > > > > >           ^
> > > > > > > > > > > >           |
> > > > > > > > > > > >          y|      o------------------
> > > > > > > > > > > >           |      |                 | h
> > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > >           |               w
> > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > >
> > > > > > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > > > > > corner
> > > > > > > > > and
> > > > > > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > > > > > reference system origin point, and specify the horizontal and
> > > > > > > > > vertical
> > > > > > > > > > > > dimensions always increment along their respective axis, as in
> > > > > > > the
> > > > > > > > > > > > following example.
> > > > > > > > > > > >
> > > > > > > > > > > >           ^
> > > > > > > > > > > >           |
> > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > >           |      ^                 | h
> > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > >          y|      o---->-------------
> > > > > > > > > > > >           |               w
> > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > >
> > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > >             ------------------------------>
> > > > > > > > > > > >            |              w
> > > > > > > > > > > >           y|     o---->-------------
> > > > > > > > > > > >            |     |                 | h
> > > > > > > > > > > >            |     v                 |
> > > > > > > > > > > >            |     -------------------
> > > > > > > > > > > >            |
> > > > > > > > > > > >            V
> > > > > > > > > > > >
> > > > > > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > > > > > >
> > > > > > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > > > > ---
> > > > > > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > > > > > ++++++++++++++-----
> > > > > > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > > > > > >
> > > > > > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > > > > > b/include/libcamera/geometry.h
> > > > > > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > > > > > >               return { width, height };
> > > > > > > > > > > >       }
> > > > > > > > > > > >
> > > > > > > > > > > > -     Point topLeft() const
> > > > > > > > > > > > +     Point origin() const
> > > > > > > > > > > >       {
> > > > > > > > > > > >               return { x, y };
> > > > > > > > > > > >       }
> > > > > > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > > > > > IPAConfigInfo &configInfo)
> > > > > > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > > > > > >        */
> > > > > > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > > > > > +     Point start = roi.origin();
> > > > > > > > > > > >
> > > > > > > > > > > >       /* x_start and y_start should be even */
> > > > > > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > > > > > b/src/libcamera/geometry.cpp
> > > > > > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > > > > > >    *
> > > > > > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > > > > > are
> > > > > > > > > specified by
> > > > > > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > > > > > vertical size.
> > > > > > > > > > > > + * the coordinates of the corner closer to the reference
> > > > > > > system's
> > > > > > > > > origin point
> > > > > > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > > > > > >    *
> > > > > > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > > > > > well
> > > > > > > > > as the
> > > > > > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > > > > > displacements
> > > > > > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > > > > > + * The corner closer to the reference system's origin point is
> > > > > > > the
> > > > > > > > > rectangle's
> > > > > > > > > > > > + * origin corner.
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * \verbatim
> > > > > > > > > > > > +
> > > > > > > > > > > > +  o = origin corner
> > > > > > > > > > > > +
> > > > > > > > > > > > +         ^
> > > > > > > > > > > > +         |
> > > > > > > > > > > > +         |      -------------------
> > > > > > > > > > > > +         |      ^                 |
> > > > > > > > > > > > +         |      |                 |
> > > > > > > > > > > > +         |      o---->-------------
> > > > > > > > > > > > +         |
> > > > > > > > > > > > +          ------------------------------->
> > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > +
> > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > +           ------------------------------->
> > > > > > > > > > > > +          |
> > > > > > > > > > > > +          |      o---->-------------
> > > > > > > > > > > > +          |      |                 |
> > > > > > > > > > > > +          |      v                 |
> > > > > > > > > > > > +          |      -------------------
> > > > > > > > > > > > +          |
> > > > > > > > > > > > +          V
> > > > > > > > > > > > +   \endverbatim
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > > > > > defined by the
> > > > > > > > > > > > + * context were the rectangle is used.
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > >   /**
> > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > size
> > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > >    * \param[in] size The size
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > reference system
> > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > >
> > > > > > > > > > I think we should stick to the previous description:
> > > > > > > > > > `"origin" point defined as the point with the lower x and
> > > > > > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > > > > > >
> > > > > > > > > > If we only support coordinates that are positive or 0, which
> > > > > > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > > > > > `unsigned int`?
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > > To be honest I would rather make width and heigh signed to allow
> > > > > > > > > constructing (x, y, -w, -h)
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >                -------------------
> > > > > > > > >                |                 ^
> > > > > > > > >                |            ------------->
> > > > > > > > >                |           |     |
> > > > > > > > >                ------<-----|-----o
> > > > > > > > >                            |
> > > > > > > > >                            |
> > > > > > > > >                            V
> > > > > > > > >
> > > > > > > > > Not sure if it's useful or not though
> > > > > > > > >
> > > > > > > >
> > > > > > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > > > > > coordinates?
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > > Don't know, maybe if the reference system where the rectangle is used
> > > > > > > into has 4 planes and so an all-negative rectangle makes sense.
> > > > > > >
> > > > > > > My point is that we should allow users of this class to express
> > > > > > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > > > > > overboard here or it makes sense.
> > > > > > >
> > > > > >
> > > > > > Yeah I agree, while doesn't that mean the description doesn't fit all
> > > > > > cases, like the corner closer to the reference system origin point of a
> > > > > > rectangle that has all negative coordinates is actually the "bottom-right"
> > > > >
> > > > > This patch aims to remove all references to "top-left" or in general
> > > > > to any visual reference exactly for that purpose. Or have I forgot any
> > > > > ?
> > > >
> > > > In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
> > > > the description of `x` and `y` are updated to "coordinates of the origin
> > > > corner", where the origin corner is "the corner closer to the reference
> > > > system origin point (0, 0)."
> > > >
> > > > As currently libcamera::Size takes only non-negative width and height,
> > > > take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
> > > > can find that the only valid way to construct this rectangle as
> > > > libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
> > > > doesn't fit with your updated description, as the corner closer to the
> > > > reference system origin point (0, 0) is actually (-1, -1), instead of
> > > > (-3, -3).
> > > >
> > >
> > > You're right. Let's take a step back though. If we have a 4 planes reference
> > > system, we always have a visual top-left indeed. As the 4 planes have
> > > negative and positive coordinates, we can describe with absolute
> > > positions the rectangle and all points in the system.
> >
> > Sorry, I still don't get your point...
> >
>
> If you have a 4 planes system
>
>                       ^
>                       |
>                       |
>                       |
>                       |
>         <--------------------------->
>                       |
>                       |
>                       |
>                       |
>                       V
>
> Then you always have a top, a left, and bottom and a right, you can
> describe width and height as negative or positive increments and your
> rectangle is always well defined as the reference system cannot be
> ambiguous. The very concept of "reference system orientation" doesn't
> make sense, as a 4-planes system describes the full 2-d space.
>
> The ambiguity I'm trying to solve is about using a 1 plane reference
> system, as depending on how the system is oriented the definition of
> the "top-left" point might change, as well as the definition of the
> horizontal and vertical increments change as well.
>
> In example:
>
>                       ^
>                       |
>                       |
>                       |  o-------
>                       |  |      |
>                       |  --------
>                       |
>                       ------------------------>
>
>         top-left: Smaller x and higher y
>         width: positive increment
>         height: negative increment
>
>
>
>
>                       ------------------------>
>                       |  o-------
>                       |  |      |
>                       |  --------
>                       |
>                       |
>                       V
>
>         top-left: Smaller x and smaller y
>         width: positive increment
>         height: positive increment
>
>
> I thought our Rectangle definition didn't make assumptions on the
> reference's system orientation and in fact that's what part of the
> documentation says, but indeed the usage of "top-left" is, as shown,
> ambiguous.
>
> So I went and changed that to be the "corner closer to the origin
> point" and specified in documentation that vertical and horizontal
> increments are always positive and I thought I was done with this, but
> then I made the mistake of talking about negative increments and
> 4-plane systems and here we are.
>
>
> > Do you mean that the new description, like
> > `The horizontal coordinate of the rectangle's origin corner`,
> > only fits with the 1-plane reference system? I thought it should fit all
> > 2D reference systems.
>
> I don't think that has never been the case, but indeed we have a
> constructor that takes "signed" x and y.

IIUC, you mean `you don't think that has ever been the case`, right?

>
> To be honest I would not be concerned about 4-planes systems, we're
> talking about imaging and what is relevant here is that we should be
> allowed to express rectangles on reference systems that can be
> oriented differently, think of a sensor's pixel array that might be
> represented with the (0, 0) position in the top-left corner compared
> to a plane 2-d image that usually has its origin in the bottom-left
> corner.
>
> I have an hard time finding a use case for expressing negative
> coordinates in this usage context. Furthermore that if we introduce 4
> planes we lose the ability to describe systems with different
> orientation, as this:
>
>                       ------------------------>
>                       |  o-------
>                       |  |      |
>                       |  --------
>                       |
>                       |
>                       V
>
> when expressed in a 4-planes system becomes
>
>                       ^
>                       |
>                       |
>                       |
>                       |
>         <--------------------------->
>                       |/////////////
>                       |/////////////
>                       |// this /////
>                       |/////////////
>                       |/////////////
>                       V
>
> And would require you to express y and height in negative coordinates.
> Sincerely, I would not go there.
>
> I can specify that the Rectangle class reference system is always a
> 2-d plane with positively increasing x and y axes instead.

Yeah I think specifying that is a great idea, and maybe a TODO to
set `x` and `y` to be unsigned int.
I hope no pipeline handlers is using signed coordinates when we
make the change in the API.

Sorry for the chaos.

>
> >
> > >
> > > The problem at hands now is relevant for 1-planes reference systems,
> > > that can be oriented differently, in example with the origin point
> > > being in top-left or bottom-left positions, as per the examples above.
> > > In this case I think we agree that "top-left" is ambiguous. The x and
> > > y coordinates are always positive in the case with a single plane.
> > >
> > > I think we should also be concerned with 1 plane reference systems and
> > > move forward with this patch that removes references to the visual
> > > "top-left" and assumes increments in width and height are always
> > > positive.
> > >
> > > > >
> > > > > > corner, and currently libcamera::Size only allows non-negative width and
> > > > > > height [1].
> > > > >
> > > > > True, Size uses unsigned int. I don't think it's a big deal and I'm
> > > > > not proposing to introduce a new constructor with signed width and
> > > > > height now, but my point is that if the need arises we can now do
> > > > > that.
> > > > >
> > > > > >
> > > > > > [1]:
> > > > > > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> > > > > >
> > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > >
> > > > > > > > > > BR,
> > > > > > > > > > Harvey
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > > > > > unsigned int height)
> > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > size
> > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > >    * \param[in] width The width
> > > > > > > > > > > >    * \param[in] height The height
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > reference system
> > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > > > > > corner
> > > > > > > > > located
> > > > > > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > > > > > corner
> > > > > > > > > located
> > > > > > > > > > > >    * at (0,0)
> > > > > > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > reference system
> > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > >    * \var Rectangle::x
> > > > > > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > > > > > corner
> > > > > > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > > > > > corner
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > reference system
> > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > >    * \var Rectangle::y
> > > > > > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > > > > > corner
> > > > > > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > > > > > corner
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > reference system
> > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > > > > > this
> > > > > > > > > Rectangle
> > > > > > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > > > > > Rectangle
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > reference system
> > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > + *
> > > > > > > > > > > > + * \return The Rectangle's origin corner
> > > > > > > > > > >
> > > > > > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > > > > > >
> > > > > > > > > > > Probably throughout the patch:
> > > > > > > > > > >      s/origin corner/origin/
> > > > > > > > > > >
> > > > > > > > > > > Otherwise, LGTM
> > > > > > > > > > >
> > > > > > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > > > > > >    */
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > > > > > Point
> > > > > > > > > &point)
> > > > > > > > > > > >    */
> > > > > > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > > > > > >   {
> > > > > > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > > > > > bound.width);
> > > > > > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > > > > > bound.height);
> > > > > > > > > > > >
> > > > > > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > > > > > 0);
> > > > > > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > > > > > 0);
> > > > > > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > > > > > 0);
> > > > > > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > > > > > 0);
> > > > > > > > > > > >
> > > > > > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > > > > > >   }
> > > > > > > > > > > >
> > > > > > > > > > > >   /**
> > > > > > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > > > > > Rectangle &ispCrop) const
> > > > > > > > > > > >        */
> > > > > > > > > > > >       Rectangle nativeCrop =
> > > > > > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > > > > > >
> > > > > > > > >  sensorInfo_.outputSize);
> > > > > > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > > > > > >       return nativeCrop;
> > > > > > > > > > > >   }
> > > > > > > > > > > >
> > > > > > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > > > > > ControlList &controls)
> > > > > > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > > > > > >
> > > > > > > > > > > >               /* Create a version of the crop scaled to ISP
> > > > > > > (camera
> > > > > > > > > mode) pixels. */
> > > > > > > > > > > > -             Rectangle ispCrop =
> > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > +             Rectangle ispCrop =
> > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > > > > > sensorInfo_.analogCrop.size());
> > > > > > > > > > > >
> > > > > > > > > > > >               /*
> > > > > > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > > > > > >               .def_property_readonly("is_null",
> > > > > > > &Rectangle::isNull)
> > > > > > > > > > > >               .def_property_readonly("center",
> > > > > > > &Rectangle::center)
> > > > > > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > > > > > -             .def_property_readonly("topLeft",
> > > > > > > &Rectangle::topLeft)
> > > > > > > > > > > > +             .def_property_readonly("origin",
> > > > > > > &Rectangle::origin)
> > > > > > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > > > > > --- a/test/geometry.cpp
> > > > > > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > >               }
> > > > > > > > > > > >
> > > > > > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > > > > > Size(100000, 200000)) {
> > > > > > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > > > > > endl;
> > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > >               }
> > > > > > > > > > > >
> > > > > > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > > > > > ||
> > > > > > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > > > > > -2)) {
> > > > > > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > > > > > <<
> > > > > > > > > endl;
> > > > > > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > > > > > ||
> > > > > > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > > > > > -2))
> > > > > > > > > {
> > > > > > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > > > > > <<
> > > > > > > > > endl;
> > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > >               }
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > 2.46.1
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > BR,
> > > > > > > > > > Harvey Yang
> > > > > > > > >
> > > > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > BR,
> > > > Harvey Yang
> >
> >
> >
> > --
> > BR,
> > Harvey Yang

Hi Harvey

On Fri, Sep 27, 2024 at 04:46:06PM GMT, Cheng-Hao Yang wrote:
> Hi Jacopo,
>
> On Fri, Sep 27, 2024 at 4:05 PM Jacopo Mondi
> <jacopo.mondi@ideasonboard.com> wrote:
> >
> > Hi Harvey
> >
> > On Thu, Sep 26, 2024 at 11:22:58PM GMT, Cheng-Hao Yang wrote:
> > > Hi Jacopo,
> > >
> > > On Thu, Sep 26, 2024 at 10:35 PM Jacopo Mondi
> > > <jacopo.mondi@ideasonboard.com> wrote:
> > > >
> > > > Hi Harvey
> > > >
> > > > On Thu, Sep 26, 2024 at 10:03:55PM GMT, Cheng-Hao Yang wrote:
> > > > > Hi Jacopo,
> > > > >
> > > > > On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
> > > > > <jacopo.mondi@ideasonboard.com> wrote:
> > > > > >
> > > > > > Hi Harvey
> > > > > >
> > > > > > On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > > > > > > Hi Jacopo,
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > wrote:
> > > > > > >
> > > > > > > > Hi Harvey
> > > > > > > >
> > > > > > > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > Hi Jacopo,
> > > > > > > > >
> > > > > > > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > > > > > > jacopo.mondi@ideasonboard.com>
> > > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > > Hi Harvey
> > > > > > > > > >
> > > > > > > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > > > Hi Jacopo,
> > > > > > > > > > >
> > > > > > > > > > > Thank you for the patch.
> > > > > > > > > > >
> > > > > > > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > > > > > > umang.jain@ideasonboard.com>
> > > > > > > > > > wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > Hi Jacopo
> > > > > > > > > > > >
> > > > > > > > > > > > Thank you for the patch
> > > > > > > > > > > >
> > > > > > > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > > > > > > >
> > > > > > > > > > > > > However the class documentation assumes the reference system
> > > > > > > > origin
> > > > > > > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > > > > > > >
> > > > > > > > > > > > > However this is ambiguous when using a different reference
> > > > > > > > system as,
> > > > > > > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > > > > > > following
> > > > > > > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > > > > > > require
> > > > > > > > > > > > > a negative decrement along the y-axis.
> > > > > > > > > > > > >
> > > > > > > > > > > > >           ^
> > > > > > > > > > > > >           |
> > > > > > > > > > > > >          y|      o------------------
> > > > > > > > > > > > >           |      |                 | h
> > > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > > >           |               w
> > > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > >
> > > > > > > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > > > > > > corner
> > > > > > > > > > and
> > > > > > > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > > > > > > reference system origin point, and specify the horizontal and
> > > > > > > > > > vertical
> > > > > > > > > > > > > dimensions always increment along their respective axis, as in
> > > > > > > > the
> > > > > > > > > > > > > following example.
> > > > > > > > > > > > >
> > > > > > > > > > > > >           ^
> > > > > > > > > > > > >           |
> > > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > > >           |      ^                 | h
> > > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > > >          y|      o---->-------------
> > > > > > > > > > > > >           |               w
> > > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > >
> > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > >             ------------------------------>
> > > > > > > > > > > > >            |              w
> > > > > > > > > > > > >           y|     o---->-------------
> > > > > > > > > > > > >            |     |                 | h
> > > > > > > > > > > > >            |     v                 |
> > > > > > > > > > > > >            |     -------------------
> > > > > > > > > > > > >            |
> > > > > > > > > > > > >            V
> > > > > > > > > > > > >
> > > > > > > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > > > > > ---
> > > > > > > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > > > > > > ++++++++++++++-----
> > > > > > > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > > > > > > >
> > > > > > > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > > > > > > b/include/libcamera/geometry.h
> > > > > > > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > > > > > > >               return { width, height };
> > > > > > > > > > > > >       }
> > > > > > > > > > > > >
> > > > > > > > > > > > > -     Point topLeft() const
> > > > > > > > > > > > > +     Point origin() const
> > > > > > > > > > > > >       {
> > > > > > > > > > > > >               return { x, y };
> > > > > > > > > > > > >       }
> > > > > > > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > > > > > > IPAConfigInfo &configInfo)
> > > > > > > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > > > > > > >        */
> > > > > > > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > > > > > > +     Point start = roi.origin();
> > > > > > > > > > > > >
> > > > > > > > > > > > >       /* x_start and y_start should be even */
> > > > > > > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > > > > > > b/src/libcamera/geometry.cpp
> > > > > > > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > > > > > > >    *
> > > > > > > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > > > > > > are
> > > > > > > > > > specified by
> > > > > > > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > > > > > > vertical size.
> > > > > > > > > > > > > + * the coordinates of the corner closer to the reference
> > > > > > > > system's
> > > > > > > > > > origin point
> > > > > > > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > > > > > > >    *
> > > > > > > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > > > > > > well
> > > > > > > > > > as the
> > > > > > > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > > > > > > displacements
> > > > > > > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > > > > > > + * The corner closer to the reference system's origin point is
> > > > > > > > the
> > > > > > > > > > rectangle's
> > > > > > > > > > > > > + * origin corner.
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * \verbatim
> > > > > > > > > > > > > +
> > > > > > > > > > > > > +  o = origin corner
> > > > > > > > > > > > > +
> > > > > > > > > > > > > +         ^
> > > > > > > > > > > > > +         |
> > > > > > > > > > > > > +         |      -------------------
> > > > > > > > > > > > > +         |      ^                 |
> > > > > > > > > > > > > +         |      |                 |
> > > > > > > > > > > > > +         |      o---->-------------
> > > > > > > > > > > > > +         |
> > > > > > > > > > > > > +          ------------------------------->
> > > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > > +
> > > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > > +           ------------------------------->
> > > > > > > > > > > > > +          |
> > > > > > > > > > > > > +          |      o---->-------------
> > > > > > > > > > > > > +          |      |                 |
> > > > > > > > > > > > > +          |      v                 |
> > > > > > > > > > > > > +          |      -------------------
> > > > > > > > > > > > > +          |
> > > > > > > > > > > > > +          V
> > > > > > > > > > > > > +   \endverbatim
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > > > > > > defined by the
> > > > > > > > > > > > > + * context were the rectangle is used.
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > > size
> > > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > > >    * \param[in] size The size
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > reference system
> > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > >
> > > > > > > > > > > I think we should stick to the previous description:
> > > > > > > > > > > `"origin" point defined as the point with the lower x and
> > > > > > > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > > > > > > >
> > > > > > > > > > > If we only support coordinates that are positive or 0, which
> > > > > > > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > > > > > > `unsigned int`?
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > To be honest I would rather make width and heigh signed to allow
> > > > > > > > > > constructing (x, y, -w, -h)
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >                -------------------
> > > > > > > > > >                |                 ^
> > > > > > > > > >                |            ------------->
> > > > > > > > > >                |           |     |
> > > > > > > > > >                ------<-----|-----o
> > > > > > > > > >                            |
> > > > > > > > > >                            |
> > > > > > > > > >                            V
> > > > > > > > > >
> > > > > > > > > > Not sure if it's useful or not though
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > > > > > > coordinates?
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > > Don't know, maybe if the reference system where the rectangle is used
> > > > > > > > into has 4 planes and so an all-negative rectangle makes sense.
> > > > > > > >
> > > > > > > > My point is that we should allow users of this class to express
> > > > > > > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > > > > > > overboard here or it makes sense.
> > > > > > > >
> > > > > > >
> > > > > > > Yeah I agree, while doesn't that mean the description doesn't fit all
> > > > > > > cases, like the corner closer to the reference system origin point of a
> > > > > > > rectangle that has all negative coordinates is actually the "bottom-right"
> > > > > >
> > > > > > This patch aims to remove all references to "top-left" or in general
> > > > > > to any visual reference exactly for that purpose. Or have I forgot any
> > > > > > ?
> > > > >
> > > > > In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
> > > > > the description of `x` and `y` are updated to "coordinates of the origin
> > > > > corner", where the origin corner is "the corner closer to the reference
> > > > > system origin point (0, 0)."
> > > > >
> > > > > As currently libcamera::Size takes only non-negative width and height,
> > > > > take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
> > > > > can find that the only valid way to construct this rectangle as
> > > > > libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
> > > > > doesn't fit with your updated description, as the corner closer to the
> > > > > reference system origin point (0, 0) is actually (-1, -1), instead of
> > > > > (-3, -3).
> > > > >
> > > >
> > > > You're right. Let's take a step back though. If we have a 4 planes reference
> > > > system, we always have a visual top-left indeed. As the 4 planes have
> > > > negative and positive coordinates, we can describe with absolute
> > > > positions the rectangle and all points in the system.
> > >
> > > Sorry, I still don't get your point...
> > >
> >
> > If you have a 4 planes system
> >
> >                       ^
> >                       |
> >                       |
> >                       |
> >                       |
> >         <--------------------------->
> >                       |
> >                       |
> >                       |
> >                       |
> >                       V
> >
> > Then you always have a top, a left, and bottom and a right, you can
> > describe width and height as negative or positive increments and your
> > rectangle is always well defined as the reference system cannot be
> > ambiguous. The very concept of "reference system orientation" doesn't
> > make sense, as a 4-planes system describes the full 2-d space.
> >
> > The ambiguity I'm trying to solve is about using a 1 plane reference
> > system, as depending on how the system is oriented the definition of
> > the "top-left" point might change, as well as the definition of the
> > horizontal and vertical increments change as well.
> >
> > In example:
> >
> >                       ^
> >                       |
> >                       |
> >                       |  o-------
> >                       |  |      |
> >                       |  --------
> >                       |
> >                       ------------------------>
> >
> >         top-left: Smaller x and higher y
> >         width: positive increment
> >         height: negative increment
> >
> >
> >
> >
> >                       ------------------------>
> >                       |  o-------
> >                       |  |      |
> >                       |  --------
> >                       |
> >                       |
> >                       V
> >
> >         top-left: Smaller x and smaller y
> >         width: positive increment
> >         height: positive increment
> >
> >
> > I thought our Rectangle definition didn't make assumptions on the
> > reference's system orientation and in fact that's what part of the
> > documentation says, but indeed the usage of "top-left" is, as shown,
> > ambiguous.
> >
> > So I went and changed that to be the "corner closer to the origin
> > point" and specified in documentation that vertical and horizontal
> > increments are always positive and I thought I was done with this, but
> > then I made the mistake of talking about negative increments and
> > 4-plane systems and here we are.
> >
> >
> > > Do you mean that the new description, like
> > > `The horizontal coordinate of the rectangle's origin corner`,
> > > only fits with the 1-plane reference system? I thought it should fit all
> > > 2D reference systems.
> >
> > I don't think that has never been the case, but indeed we have a
> > constructor that takes "signed" x and y.
>
> IIUC, you mean `you don't think that has ever been the case`, right?
>


No, I meant "I don't think the Rectangle class has been designed
to fit all 2D reference systems".

> >
> > To be honest I would not be concerned about 4-planes systems, we're
> > talking about imaging and what is relevant here is that we should be
> > allowed to express rectangles on reference systems that can be
> > oriented differently, think of a sensor's pixel array that might be
> > represented with the (0, 0) position in the top-left corner compared
> > to a plane 2-d image that usually has its origin in the bottom-left
> > corner.
> >
> > I have an hard time finding a use case for expressing negative
> > coordinates in this usage context. Furthermore that if we introduce 4
> > planes we lose the ability to describe systems with different
> > orientation, as this:
> >
> >                       ------------------------>
> >                       |  o-------
> >                       |  |      |
> >                       |  --------
> >                       |
> >                       |
> >                       V
> >
> > when expressed in a 4-planes system becomes
> >
> >                       ^
> >                       |
> >                       |
> >                       |
> >                       |
> >         <--------------------------->
> >                       |/////////////
> >                       |/////////////
> >                       |// this /////
> >                       |/////////////
> >                       |/////////////
> >                       V
> >
> > And would require you to express y and height in negative coordinates.
> > Sincerely, I would not go there.
> >
> > I can specify that the Rectangle class reference system is always a
> > 2-d plane with positively increasing x and y axes instead.
>
> Yeah I think specifying that is a great idea, and maybe a TODO to
> set `x` and `y` to be unsigned int.

I can try to do this right away and see if any compiler complains
about that.

> I hope no pipeline handlers is using signed coordinates when we
> make the change in the API.

However, geometry.h is public API, some applications might be affected
by this change.

>
> Sorry for the chaos.
>

np, if it helps to make the final result better chaos is welcome.

> >
> > >
> > > >
> > > > The problem at hands now is relevant for 1-planes reference systems,
> > > > that can be oriented differently, in example with the origin point
> > > > being in top-left or bottom-left positions, as per the examples above.
> > > > In this case I think we agree that "top-left" is ambiguous. The x and
> > > > y coordinates are always positive in the case with a single plane.
> > > >
> > > > I think we should also be concerned with 1 plane reference systems and
> > > > move forward with this patch that removes references to the visual
> > > > "top-left" and assumes increments in width and height are always
> > > > positive.
> > > >
> > > > > >
> > > > > > > corner, and currently libcamera::Size only allows non-negative width and
> > > > > > > height [1].
> > > > > >
> > > > > > True, Size uses unsigned int. I don't think it's a big deal and I'm
> > > > > > not proposing to introduce a new constructor with signed width and
> > > > > > height now, but my point is that if the need arises we can now do
> > > > > > that.
> > > > > >
> > > > > > >
> > > > > > > [1]:
> > > > > > > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> > > > > > >
> > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > > BR,
> > > > > > > > > > > Harvey
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > > > > > > unsigned int height)
> > > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > > size
> > > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > > >    * \param[in] width The width
> > > > > > > > > > > > >    * \param[in] height The height
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > reference system
> > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > > > > > > corner
> > > > > > > > > > located
> > > > > > > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > > > > > > corner
> > > > > > > > > > located
> > > > > > > > > > > > >    * at (0,0)
> > > > > > > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > reference system
> > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > >    * \var Rectangle::x
> > > > > > > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > > > > > > corner
> > > > > > > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > > > > > > corner
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > reference system
> > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > >    * \var Rectangle::y
> > > > > > > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > > > > > > corner
> > > > > > > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > > > > > > corner
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > reference system
> > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > > > > > > this
> > > > > > > > > > Rectangle
> > > > > > > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > > > > > > Rectangle
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > reference system
> > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > + *
> > > > > > > > > > > > > + * \return The Rectangle's origin corner
> > > > > > > > > > > >
> > > > > > > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > > > > > > >
> > > > > > > > > > > > Probably throughout the patch:
> > > > > > > > > > > >      s/origin corner/origin/
> > > > > > > > > > > >
> > > > > > > > > > > > Otherwise, LGTM
> > > > > > > > > > > >
> > > > > > > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > > > > > > Point
> > > > > > > > > > &point)
> > > > > > > > > > > > >    */
> > > > > > > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > > > > > > >   {
> > > > > > > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > > > > > > bound.width);
> > > > > > > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > > > > > > bound.height);
> > > > > > > > > > > > >
> > > > > > > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > > > > > > 0);
> > > > > > > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > > > > > > 0);
> > > > > > > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > > > > > > 0);
> > > > > > > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > > > > > > 0);
> > > > > > > > > > > > >
> > > > > > > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > > > > > > >   }
> > > > > > > > > > > > >
> > > > > > > > > > > > >   /**
> > > > > > > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > > > > > > Rectangle &ispCrop) const
> > > > > > > > > > > > >        */
> > > > > > > > > > > > >       Rectangle nativeCrop =
> > > > > > > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > > > > > > >
> > > > > > > > > >  sensorInfo_.outputSize);
> > > > > > > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > > > > > > >       return nativeCrop;
> > > > > > > > > > > > >   }
> > > > > > > > > > > > >
> > > > > > > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > > > > > > ControlList &controls)
> > > > > > > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > > > > > > >
> > > > > > > > > > > > >               /* Create a version of the crop scaled to ISP
> > > > > > > > (camera
> > > > > > > > > > mode) pixels. */
> > > > > > > > > > > > > -             Rectangle ispCrop =
> > > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > > +             Rectangle ispCrop =
> > > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > > > > > > sensorInfo_.analogCrop.size());
> > > > > > > > > > > > >
> > > > > > > > > > > > >               /*
> > > > > > > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > > > > > > >               .def_property_readonly("is_null",
> > > > > > > > &Rectangle::isNull)
> > > > > > > > > > > > >               .def_property_readonly("center",
> > > > > > > > &Rectangle::center)
> > > > > > > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > > > > > > -             .def_property_readonly("topLeft",
> > > > > > > > &Rectangle::topLeft)
> > > > > > > > > > > > > +             .def_property_readonly("origin",
> > > > > > > > &Rectangle::origin)
> > > > > > > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > > > > > > --- a/test/geometry.cpp
> > > > > > > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > >               }
> > > > > > > > > > > > >
> > > > > > > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > > > > > > Size(100000, 200000)) {
> > > > > > > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > > > > > > endl;
> > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > >               }
> > > > > > > > > > > > >
> > > > > > > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > > > > > > ||
> > > > > > > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > > > > > > -2)) {
> > > > > > > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > > > > > > <<
> > > > > > > > > > endl;
> > > > > > > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > > > > > > ||
> > > > > > > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > > > > > > -2))
> > > > > > > > > > {
> > > > > > > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > > > > > > <<
> > > > > > > > > > endl;
> > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > >               }
> > > > > > > > > > > > >
> > > > > > > > > > > > > --
> > > > > > > > > > > > > 2.46.1
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > --
> > > > > > > > > > > BR,
> > > > > > > > > > > Harvey Yang
> > > > > > > > > >
> > > > > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > BR,
> > > > > Harvey Yang
> > >
> > >
> > >
> > > --
> > > BR,
> > > Harvey Yang
>
>
>
> --
> BR,
> Harvey Yang

Hi again

On Fri, Sep 27, 2024 at 10:54:20AM GMT, Jacopo Mondi wrote:
> Hi Harvey
>
> On Fri, Sep 27, 2024 at 04:46:06PM GMT, Cheng-Hao Yang wrote:
> > Hi Jacopo,
> >
> > On Fri, Sep 27, 2024 at 4:05 PM Jacopo Mondi
> > <jacopo.mondi@ideasonboard.com> wrote:
> > >
> > > Hi Harvey
> > >
> > > On Thu, Sep 26, 2024 at 11:22:58PM GMT, Cheng-Hao Yang wrote:
> > > > Hi Jacopo,
> > > >
> > > > On Thu, Sep 26, 2024 at 10:35 PM Jacopo Mondi
> > > > <jacopo.mondi@ideasonboard.com> wrote:
> > > > >
> > > > > Hi Harvey
> > > > >
> > > > > On Thu, Sep 26, 2024 at 10:03:55PM GMT, Cheng-Hao Yang wrote:
> > > > > > Hi Jacopo,
> > > > > >
> > > > > > On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
> > > > > > <jacopo.mondi@ideasonboard.com> wrote:
> > > > > > >
> > > > > > > Hi Harvey
> > > > > > >
> > > > > > > On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > Hi Jacopo,
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > wrote:
> > > > > > > >
> > > > > > > > > Hi Harvey
> > > > > > > > >
> > > > > > > > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > > Hi Jacopo,
> > > > > > > > > >
> > > > > > > > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > > > > > > > jacopo.mondi@ideasonboard.com>
> > > > > > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > > Hi Harvey
> > > > > > > > > > >
> > > > > > > > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > > > > Hi Jacopo,
> > > > > > > > > > > >
> > > > > > > > > > > > Thank you for the patch.
> > > > > > > > > > > >
> > > > > > > > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > > > > > > > umang.jain@ideasonboard.com>
> > > > > > > > > > > wrote:
> > > > > > > > > > > > >
> > > > > > > > > > > > > Hi Jacopo
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thank you for the patch
> > > > > > > > > > > > >
> > > > > > > > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > However the class documentation assumes the reference system
> > > > > > > > > origin
> > > > > > > > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > However this is ambiguous when using a different reference
> > > > > > > > > system as,
> > > > > > > > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > > > > > > > following
> > > > > > > > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > > > > > > > require
> > > > > > > > > > > > > > a negative decrement along the y-axis.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >           ^
> > > > > > > > > > > > > >           |
> > > > > > > > > > > > > >          y|      o------------------
> > > > > > > > > > > > > >           |      |                 | h
> > > > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > > > >           |               w
> > > > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > > > > > > > corner
> > > > > > > > > > > and
> > > > > > > > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > > > > > > > reference system origin point, and specify the horizontal and
> > > > > > > > > > > vertical
> > > > > > > > > > > > > > dimensions always increment along their respective axis, as in
> > > > > > > > > the
> > > > > > > > > > > > > > following example.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >           ^
> > > > > > > > > > > > > >           |
> > > > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > > > >           |      ^                 | h
> > > > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > > > >          y|      o---->-------------
> > > > > > > > > > > > > >           |               w
> > > > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > > >             ------------------------------>
> > > > > > > > > > > > > >            |              w
> > > > > > > > > > > > > >           y|     o---->-------------
> > > > > > > > > > > > > >            |     |                 | h
> > > > > > > > > > > > > >            |     v                 |
> > > > > > > > > > > > > >            |     -------------------
> > > > > > > > > > > > > >            |
> > > > > > > > > > > > > >            V
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > > > > > > ---
> > > > > > > > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > > > > > > > ++++++++++++++-----
> > > > > > > > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > > > > > > > b/include/libcamera/geometry.h
> > > > > > > > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > > > > > > > >               return { width, height };
> > > > > > > > > > > > > >       }
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > -     Point topLeft() const
> > > > > > > > > > > > > > +     Point origin() const
> > > > > > > > > > > > > >       {
> > > > > > > > > > > > > >               return { x, y };
> > > > > > > > > > > > > >       }
> > > > > > > > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > > > > > > > IPAConfigInfo &configInfo)
> > > > > > > > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > > > > > > > >        */
> > > > > > > > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > > > > > > > +     Point start = roi.origin();
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >       /* x_start and y_start should be even */
> > > > > > > > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > > > > > > > b/src/libcamera/geometry.cpp
> > > > > > > > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > > > > > > > >    *
> > > > > > > > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > > > > > > > are
> > > > > > > > > > > specified by
> > > > > > > > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > > > > > > > vertical size.
> > > > > > > > > > > > > > + * the coordinates of the corner closer to the reference
> > > > > > > > > system's
> > > > > > > > > > > origin point
> > > > > > > > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > > > > > > > >    *
> > > > > > > > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > > > > > > > well
> > > > > > > > > > > as the
> > > > > > > > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > > > > > > > displacements
> > > > > > > > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > > > > > > > + * The corner closer to the reference system's origin point is
> > > > > > > > > the
> > > > > > > > > > > rectangle's
> > > > > > > > > > > > > > + * origin corner.
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * \verbatim
> > > > > > > > > > > > > > +
> > > > > > > > > > > > > > +  o = origin corner
> > > > > > > > > > > > > > +
> > > > > > > > > > > > > > +         ^
> > > > > > > > > > > > > > +         |
> > > > > > > > > > > > > > +         |      -------------------
> > > > > > > > > > > > > > +         |      ^                 |
> > > > > > > > > > > > > > +         |      |                 |
> > > > > > > > > > > > > > +         |      o---->-------------
> > > > > > > > > > > > > > +         |
> > > > > > > > > > > > > > +          ------------------------------->
> > > > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > > > +
> > > > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > > > +           ------------------------------->
> > > > > > > > > > > > > > +          |
> > > > > > > > > > > > > > +          |      o---->-------------
> > > > > > > > > > > > > > +          |      |                 |
> > > > > > > > > > > > > > +          |      v                 |
> > > > > > > > > > > > > > +          |      -------------------
> > > > > > > > > > > > > > +          |
> > > > > > > > > > > > > > +          V
> > > > > > > > > > > > > > +   \endverbatim
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > > > > > > > defined by the
> > > > > > > > > > > > > > + * context were the rectangle is used.
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > > > size
> > > > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > > > >    * \param[in] size The size
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > reference system
> > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > >
> > > > > > > > > > > > I think we should stick to the previous description:
> > > > > > > > > > > > `"origin" point defined as the point with the lower x and
> > > > > > > > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > > > > > > > >
> > > > > > > > > > > > If we only support coordinates that are positive or 0, which
> > > > > > > > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > > > > > > > `unsigned int`?
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > To be honest I would rather make width and heigh signed to allow
> > > > > > > > > > > constructing (x, y, -w, -h)
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >                -------------------
> > > > > > > > > > >                |                 ^
> > > > > > > > > > >                |            ------------->
> > > > > > > > > > >                |           |     |
> > > > > > > > > > >                ------<-----|-----o
> > > > > > > > > > >                            |
> > > > > > > > > > >                            |
> > > > > > > > > > >                            V
> > > > > > > > > > >
> > > > > > > > > > > Not sure if it's useful or not though
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > > > > > > > coordinates?
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > > Don't know, maybe if the reference system where the rectangle is used
> > > > > > > > > into has 4 planes and so an all-negative rectangle makes sense.
> > > > > > > > >
> > > > > > > > > My point is that we should allow users of this class to express
> > > > > > > > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > > > > > > > overboard here or it makes sense.
> > > > > > > > >
> > > > > > > >
> > > > > > > > Yeah I agree, while doesn't that mean the description doesn't fit all
> > > > > > > > cases, like the corner closer to the reference system origin point of a
> > > > > > > > rectangle that has all negative coordinates is actually the "bottom-right"
> > > > > > >
> > > > > > > This patch aims to remove all references to "top-left" or in general
> > > > > > > to any visual reference exactly for that purpose. Or have I forgot any
> > > > > > > ?
> > > > > >
> > > > > > In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
> > > > > > the description of `x` and `y` are updated to "coordinates of the origin
> > > > > > corner", where the origin corner is "the corner closer to the reference
> > > > > > system origin point (0, 0)."
> > > > > >
> > > > > > As currently libcamera::Size takes only non-negative width and height,
> > > > > > take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
> > > > > > can find that the only valid way to construct this rectangle as
> > > > > > libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
> > > > > > doesn't fit with your updated description, as the corner closer to the
> > > > > > reference system origin point (0, 0) is actually (-1, -1), instead of
> > > > > > (-3, -3).
> > > > > >
> > > > >
> > > > > You're right. Let's take a step back though. If we have a 4 planes reference
> > > > > system, we always have a visual top-left indeed. As the 4 planes have
> > > > > negative and positive coordinates, we can describe with absolute
> > > > > positions the rectangle and all points in the system.
> > > >
> > > > Sorry, I still don't get your point...
> > > >
> > >
> > > If you have a 4 planes system
> > >
> > >                       ^
> > >                       |
> > >                       |
> > >                       |
> > >                       |
> > >         <--------------------------->
> > >                       |
> > >                       |
> > >                       |
> > >                       |
> > >                       V
> > >
> > > Then you always have a top, a left, and bottom and a right, you can
> > > describe width and height as negative or positive increments and your
> > > rectangle is always well defined as the reference system cannot be
> > > ambiguous. The very concept of "reference system orientation" doesn't
> > > make sense, as a 4-planes system describes the full 2-d space.
> > >
> > > The ambiguity I'm trying to solve is about using a 1 plane reference
> > > system, as depending on how the system is oriented the definition of
> > > the "top-left" point might change, as well as the definition of the
> > > horizontal and vertical increments change as well.
> > >
> > > In example:
> > >
> > >                       ^
> > >                       |
> > >                       |
> > >                       |  o-------
> > >                       |  |      |
> > >                       |  --------
> > >                       |
> > >                       ------------------------>
> > >
> > >         top-left: Smaller x and higher y
> > >         width: positive increment
> > >         height: negative increment
> > >
> > >
> > >
> > >
> > >                       ------------------------>
> > >                       |  o-------
> > >                       |  |      |
> > >                       |  --------
> > >                       |
> > >                       |
> > >                       V
> > >
> > >         top-left: Smaller x and smaller y
> > >         width: positive increment
> > >         height: positive increment
> > >
> > >
> > > I thought our Rectangle definition didn't make assumptions on the
> > > reference's system orientation and in fact that's what part of the
> > > documentation says, but indeed the usage of "top-left" is, as shown,
> > > ambiguous.
> > >
> > > So I went and changed that to be the "corner closer to the origin
> > > point" and specified in documentation that vertical and horizontal
> > > increments are always positive and I thought I was done with this, but
> > > then I made the mistake of talking about negative increments and
> > > 4-plane systems and here we are.
> > >
> > >
> > > > Do you mean that the new description, like
> > > > `The horizontal coordinate of the rectangle's origin corner`,
> > > > only fits with the 1-plane reference system? I thought it should fit all
> > > > 2D reference systems.
> > >
> > > I don't think that has never been the case, but indeed we have a
> > > constructor that takes "signed" x and y.
> >
> > IIUC, you mean `you don't think that has ever been the case`, right?
> >
>
>
> No, I meant "I don't think the Rectangle class has been designed
> to fit all 2D reference systems".
>
> > >
> > > To be honest I would not be concerned about 4-planes systems, we're
> > > talking about imaging and what is relevant here is that we should be
> > > allowed to express rectangles on reference systems that can be
> > > oriented differently, think of a sensor's pixel array that might be
> > > represented with the (0, 0) position in the top-left corner compared
> > > to a plane 2-d image that usually has its origin in the bottom-left
> > > corner.
> > >
> > > I have an hard time finding a use case for expressing negative
> > > coordinates in this usage context. Furthermore that if we introduce 4
> > > planes we lose the ability to describe systems with different
> > > orientation, as this:
> > >
> > >                       ------------------------>
> > >                       |  o-------
> > >                       |  |      |
> > >                       |  --------
> > >                       |
> > >                       |
> > >                       V
> > >
> > > when expressed in a 4-planes system becomes
> > >
> > >                       ^
> > >                       |
> > >                       |
> > >                       |
> > >                       |
> > >         <--------------------------->
> > >                       |/////////////
> > >                       |/////////////
> > >                       |// this /////
> > >                       |/////////////
> > >                       |/////////////
> > >                       V
> > >
> > > And would require you to express y and height in negative coordinates.
> > > Sincerely, I would not go there.
> > >
> > > I can specify that the Rectangle class reference system is always a
> > > 2-d plane with positively increasing x and y axes instead.
> >
> > Yeah I think specifying that is a great idea, and maybe a TODO to
> > set `x` and `y` to be unsigned int.
>
> I can try to do this right away and see if any compiler complains
> about that.
>
> > I hope no pipeline handlers is using signed coordinates when we
> > make the change in the API.
>
> However, geometry.h is public API, some applications might be affected
> by this change.
>
> >
> > Sorry for the chaos.
> >
>
> np, if it helps to make the final result better chaos is welcome.

Seems like I made even more chaos

I tried to standardize the gemotry library to work with a single
quadrant (what I called 'plane' in the previous email is actually a
'quadrant') but it's a mess, we translate and move rectangles and
defining the behaviour when it happens to get into negative
coordinates is tricky and I don't like the result.

I also have gone through the issue with Laurent and it's probably
better to take a step back

1) let's define top-left as the point with smallest x and smallest y
(even if it's not actually top-left), I'll send a patch to update the doc
2) You 2 points constructors could be re-implemented on this by taking
the min(p1.x, p2.x) and min(p1.y, p2.y), this shouldn't be ambiguous
anymore if we always take the "smallest" point
4) with your ack I'll rebase your series on my patch and will send out
a new version

once reviewed I'll merge them

Thanks and sorry for this long thread

>
> > >
> > > >
> > > > >
> > > > > The problem at hands now is relevant for 1-planes reference systems,
> > > > > that can be oriented differently, in example with the origin point
> > > > > being in top-left or bottom-left positions, as per the examples above.
> > > > > In this case I think we agree that "top-left" is ambiguous. The x and
> > > > > y coordinates are always positive in the case with a single plane.
> > > > >
> > > > > I think we should also be concerned with 1 plane reference systems and
> > > > > move forward with this patch that removes references to the visual
> > > > > "top-left" and assumes increments in width and height are always
> > > > > positive.
> > > > >
> > > > > > >
> > > > > > > > corner, and currently libcamera::Size only allows non-negative width and
> > > > > > > > height [1].
> > > > > > >
> > > > > > > True, Size uses unsigned int. I don't think it's a big deal and I'm
> > > > > > > not proposing to introduce a new constructor with signed width and
> > > > > > > height now, but my point is that if the need arises we can now do
> > > > > > > that.
> > > > > > >
> > > > > > > >
> > > > > > > > [1]:
> > > > > > > > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> > > > > > > >
> > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > > BR,
> > > > > > > > > > > > Harvey
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > > > > > > > unsigned int height)
> > > > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > > > size
> > > > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > > > >    * \param[in] width The width
> > > > > > > > > > > > > >    * \param[in] height The height
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > reference system
> > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > > > > > > > corner
> > > > > > > > > > > located
> > > > > > > > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > > > > > > > corner
> > > > > > > > > > > located
> > > > > > > > > > > > > >    * at (0,0)
> > > > > > > > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > reference system
> > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > >    * \var Rectangle::x
> > > > > > > > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > > > > > > > corner
> > > > > > > > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > > > > > > > corner
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > reference system
> > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > >    * \var Rectangle::y
> > > > > > > > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > > > > > > > corner
> > > > > > > > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > > > > > > > corner
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > reference system
> > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > > > > > > > this
> > > > > > > > > > > Rectangle
> > > > > > > > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > > > > > > > Rectangle
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > reference system
> > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > + * \return The Rectangle's origin corner
> > > > > > > > > > > > >
> > > > > > > > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > > > > > > > >
> > > > > > > > > > > > > Probably throughout the patch:
> > > > > > > > > > > > >      s/origin corner/origin/
> > > > > > > > > > > > >
> > > > > > > > > > > > > Otherwise, LGTM
> > > > > > > > > > > > >
> > > > > > > > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > > > > > > > Point
> > > > > > > > > > > &point)
> > > > > > > > > > > > > >    */
> > > > > > > > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > > > > > > > >   {
> > > > > > > > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > > > > > > > bound.width);
> > > > > > > > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > > > > > > > bound.height);
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > > > > > > > 0);
> > > > > > > > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > > > > > > > 0);
> > > > > > > > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > > > > > > > 0);
> > > > > > > > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > > > > > > > 0);
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > > > > > > > >   }
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > > > > > > > Rectangle &ispCrop) const
> > > > > > > > > > > > > >        */
> > > > > > > > > > > > > >       Rectangle nativeCrop =
> > > > > > > > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > > > > > > > >
> > > > > > > > > > >  sensorInfo_.outputSize);
> > > > > > > > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > > > > > > > >       return nativeCrop;
> > > > > > > > > > > > > >   }
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > > > > > > > ControlList &controls)
> > > > > > > > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >               /* Create a version of the crop scaled to ISP
> > > > > > > > > (camera
> > > > > > > > > > > mode) pixels. */
> > > > > > > > > > > > > > -             Rectangle ispCrop =
> > > > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > > > +             Rectangle ispCrop =
> > > > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > > > > > > > sensorInfo_.analogCrop.size());
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >               /*
> > > > > > > > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > > > > > > > >               .def_property_readonly("is_null",
> > > > > > > > > &Rectangle::isNull)
> > > > > > > > > > > > > >               .def_property_readonly("center",
> > > > > > > > > &Rectangle::center)
> > > > > > > > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > > > > > > > -             .def_property_readonly("topLeft",
> > > > > > > > > &Rectangle::topLeft)
> > > > > > > > > > > > > > +             .def_property_readonly("origin",
> > > > > > > > > &Rectangle::origin)
> > > > > > > > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > > > > > > > --- a/test/geometry.cpp
> > > > > > > > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > > >               }
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > > > > > > > Size(100000, 200000)) {
> > > > > > > > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > > > > > > > endl;
> > > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > > >               }
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > > > > > > > ||
> > > > > > > > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > > > > > > > -2)) {
> > > > > > > > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > > > > > > > <<
> > > > > > > > > > > endl;
> > > > > > > > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > > > > > > > ||
> > > > > > > > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > > > > > > > -2))
> > > > > > > > > > > {
> > > > > > > > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > > > > > > > <<
> > > > > > > > > > > endl;
> > > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > > >               }
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > --
> > > > > > > > > > > > > > 2.46.1
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > BR,
> > > > > > > > > > > > Harvey Yang
> > > > > > > > > > >
> > > > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > BR,
> > > > > > Harvey Yang
> > > >
> > > >
> > > >
> > > > --
> > > > BR,
> > > > Harvey Yang
> >
> >
> >
> > --
> > BR,
> > Harvey Yang

Hi Jacopo,

On Fri, Sep 27, 2024 at 10:51 PM Jacopo Mondi
<jacopo.mondi@ideasonboard.com> wrote:
>
> Hi again
>
> On Fri, Sep 27, 2024 at 10:54:20AM GMT, Jacopo Mondi wrote:
> > Hi Harvey
> >
> > On Fri, Sep 27, 2024 at 04:46:06PM GMT, Cheng-Hao Yang wrote:
> > > Hi Jacopo,
> > >
> > > On Fri, Sep 27, 2024 at 4:05 PM Jacopo Mondi
> > > <jacopo.mondi@ideasonboard.com> wrote:
> > > >
> > > > Hi Harvey
> > > >
> > > > On Thu, Sep 26, 2024 at 11:22:58PM GMT, Cheng-Hao Yang wrote:
> > > > > Hi Jacopo,
> > > > >
> > > > > On Thu, Sep 26, 2024 at 10:35 PM Jacopo Mondi
> > > > > <jacopo.mondi@ideasonboard.com> wrote:
> > > > > >
> > > > > > Hi Harvey
> > > > > >
> > > > > > On Thu, Sep 26, 2024 at 10:03:55PM GMT, Cheng-Hao Yang wrote:
> > > > > > > Hi Jacopo,
> > > > > > >
> > > > > > > On Thu, Sep 26, 2024 at 5:36 PM Jacopo Mondi
> > > > > > > <jacopo.mondi@ideasonboard.com> wrote:
> > > > > > > >
> > > > > > > > Hi Harvey
> > > > > > > >
> > > > > > > > On Thu, Sep 26, 2024 at 05:28:13PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > Hi Jacopo,
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On Thu, Sep 26, 2024, 4:38 PM Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > > Hi Harvey
> > > > > > > > > >
> > > > > > > > > > On Thu, Sep 26, 2024 at 04:29:50PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > > > Hi Jacopo,
> > > > > > > > > > >
> > > > > > > > > > > On Thu, Sep 26, 2024, 4:03 PM Jacopo Mondi <
> > > > > > > > > > jacopo.mondi@ideasonboard.com>
> > > > > > > > > > > wrote:
> > > > > > > > > > >
> > > > > > > > > > > > Hi Harvey
> > > > > > > > > > > >
> > > > > > > > > > > > On Wed, Sep 25, 2024 at 03:09:38PM GMT, Cheng-Hao Yang wrote:
> > > > > > > > > > > > > Hi Jacopo,
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thank you for the patch.
> > > > > > > > > > > > >
> > > > > > > > > > > > > On Wed, Sep 25, 2024 at 2:36 PM Umang Jain <
> > > > > > > > > > umang.jain@ideasonboard.com>
> > > > > > > > > > > > wrote:
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Hi Jacopo
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Thank you for the patch
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > On 24/09/24 6:15 pm, Jacopo Mondi wrote:
> > > > > > > > > > > > > > > The libcamera::Rectangle class should allow defining rectangles
> > > > > > > > > > > > > > > regardless of the reference system where an instance is used in.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > However the class documentation assumes the reference system
> > > > > > > > > > origin
> > > > > > > > > > > > > > > point to be in the visual top-left side and that rectangles are
> > > > > > > > > > > > > > > constructed by specifying the top-left corner position and sizes.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > However this is ambiguous when using a different reference
> > > > > > > > > > system as,
> > > > > > > > > > > > > > > in example, constructing a rectangle (x, y, w, h) in the
> > > > > > > > > > following
> > > > > > > > > > > > > > > scenario, with the origin corner in the top-left position, would
> > > > > > > > > > > > require
> > > > > > > > > > > > > > > a negative decrement along the y-axis.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >           ^
> > > > > > > > > > > > > > >           |
> > > > > > > > > > > > > > >          y|      o------------------
> > > > > > > > > > > > > > >           |      |                 | h
> > > > > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > > > > >           |               w
> > > > > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > To remove ambiguities, drop references to the visual top-left
> > > > > > > > > > corner
> > > > > > > > > > > > and
> > > > > > > > > > > > > > > define the rectangle's origin corner as the corner closer to the
> > > > > > > > > > > > > > > reference system origin point, and specify the horizontal and
> > > > > > > > > > > > vertical
> > > > > > > > > > > > > > > dimensions always increment along their respective axis, as in
> > > > > > > > > > the
> > > > > > > > > > > > > > > following example.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >           ^
> > > > > > > > > > > > > > >           |
> > > > > > > > > > > > > > >           |      -------------------
> > > > > > > > > > > > > > >           |      ^                 | h
> > > > > > > > > > > > > > >           |      |                 |
> > > > > > > > > > > > > > >          y|      o---->-------------
> > > > > > > > > > > > > > >           |               w
> > > > > > > > > > > > > > >            ------------------------------->
> > > > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >           (0,0)  x
> > > > > > > > > > > > > > >             ------------------------------>
> > > > > > > > > > > > > > >            |              w
> > > > > > > > > > > > > > >           y|     o---->-------------
> > > > > > > > > > > > > > >            |     |                 | h
> > > > > > > > > > > > > > >            |     v                 |
> > > > > > > > > > > > > > >            |     -------------------
> > > > > > > > > > > > > > >            |
> > > > > > > > > > > > > > >            V
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Also rename for consistency the Rectangle::topLeft() function to
> > > > > > > > > > > > > > > Rectangle::origin() and update its in-tree users.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > > > > > > > > > > > > > > ---
> > > > > > > > > > > > > > >   include/libcamera/geometry.h                  |  2 +-
> > > > > > > > > > > > > > >   src/ipa/ipu3/algorithms/af.cpp                |  2 +-
> > > > > > > > > > > > > > >   src/libcamera/geometry.cpp                    | 85
> > > > > > > > > > > > ++++++++++++++-----
> > > > > > > > > > > > > > >   .../pipeline/rpi/common/pipeline_base.cpp     |  4 +-
> > > > > > > > > > > > > > >   src/py/libcamera/py_geometry.cpp              |  2 +-
> > > > > > > > > > > > > > >   test/geometry.cpp                             |  8 +-
> > > > > > > > > > > > > > >   6 files changed, 75 insertions(+), 28 deletions(-)
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > diff --git a/include/libcamera/geometry.h
> > > > > > > > > > > > b/include/libcamera/geometry.h
> > > > > > > > > > > > > > > index 3e6f0f5d7fab..07cb0a7866fe 100644
> > > > > > > > > > > > > > > --- a/include/libcamera/geometry.h
> > > > > > > > > > > > > > > +++ b/include/libcamera/geometry.h
> > > > > > > > > > > > > > > @@ -277,7 +277,7 @@ public:
> > > > > > > > > > > > > > >               return { width, height };
> > > > > > > > > > > > > > >       }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > -     Point topLeft() const
> > > > > > > > > > > > > > > +     Point origin() const
> > > > > > > > > > > > > > >       {
> > > > > > > > > > > > > > >               return { x, y };
> > > > > > > > > > > > > > >       }
> > > > > > > > > > > > > > > diff --git a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > > > index cf68fb59c49b..1b707e9dd9ab 100644
> > > > > > > > > > > > > > > --- a/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > > > +++ b/src/ipa/ipu3/algorithms/af.cpp
> > > > > > > > > > > > > > > @@ -155,7 +155,7 @@ int Af::configure(IPAContext &context, const
> > > > > > > > > > > > IPAConfigInfo &configInfo)
> > > > > > > > > > > > > > >        * - Return the AF ROI as metadata in the Request
> > > > > > > > > > > > > > >        */
> > > > > > > > > > > > > > >       Rectangle roi = gridSize.centeredTo(bds.center());
> > > > > > > > > > > > > > > -     Point start = roi.topLeft();
> > > > > > > > > > > > > > > +     Point start = roi.origin();
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >       /* x_start and y_start should be even */
> > > > > > > > > > > > > > >       grid.x_start = utils::alignDown(start.x, 2);
> > > > > > > > > > > > > > > diff --git a/src/libcamera/geometry.cpp
> > > > > > > > > > b/src/libcamera/geometry.cpp
> > > > > > > > > > > > > > > index 000151364c7f..45ba81a99920 100644
> > > > > > > > > > > > > > > --- a/src/libcamera/geometry.cpp
> > > > > > > > > > > > > > > +++ b/src/libcamera/geometry.cpp
> > > > > > > > > > > > > > > @@ -593,11 +593,39 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > > > > >    * \brief Describe a rectangle's position and dimensions
> > > > > > > > > > > > > > >    *
> > > > > > > > > > > > > > >    * Rectangles are used to identify an area of an image. They
> > > > > > > > > > are
> > > > > > > > > > > > specified by
> > > > > > > > > > > > > > > - * the coordinates of top-left corner and their horizontal and
> > > > > > > > > > > > vertical size.
> > > > > > > > > > > > > > > + * the coordinates of the corner closer to the reference
> > > > > > > > > > system's
> > > > > > > > > > > > origin point
> > > > > > > > > > > > > > > + * and by horizontal and vertical increments from there.
> > > > > > > > > > > > > > >    *
> > > > > > > > > > > > > > > - * The measure unit of the rectangle coordinates and size, as
> > > > > > > > > > well
> > > > > > > > > > > > as the
> > > > > > > > > > > > > > > - * reference point from which the Rectangle::x and Rectangle::y
> > > > > > > > > > > > displacements
> > > > > > > > > > > > > > > - * refers to, are defined by the context were rectangle is used.
> > > > > > > > > > > > > > > + * The corner closer to the reference system's origin point is
> > > > > > > > > > the
> > > > > > > > > > > > rectangle's
> > > > > > > > > > > > > > > + * origin corner.
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * \verbatim
> > > > > > > > > > > > > > > +
> > > > > > > > > > > > > > > +  o = origin corner
> > > > > > > > > > > > > > > +
> > > > > > > > > > > > > > > +         ^
> > > > > > > > > > > > > > > +         |
> > > > > > > > > > > > > > > +         |      -------------------
> > > > > > > > > > > > > > > +         |      ^                 |
> > > > > > > > > > > > > > > +         |      |                 |
> > > > > > > > > > > > > > > +         |      o---->-------------
> > > > > > > > > > > > > > > +         |
> > > > > > > > > > > > > > > +          ------------------------------->
> > > > > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > > > > +
> > > > > > > > > > > > > > > +         (0,0)
> > > > > > > > > > > > > > > +           ------------------------------->
> > > > > > > > > > > > > > > +          |
> > > > > > > > > > > > > > > +          |      o---->-------------
> > > > > > > > > > > > > > > +          |      |                 |
> > > > > > > > > > > > > > > +          |      v                 |
> > > > > > > > > > > > > > > +          |      -------------------
> > > > > > > > > > > > > > > +          |
> > > > > > > > > > > > > > > +          V
> > > > > > > > > > > > > > > +   \endverbatim
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * The measure unit of the rectangle coordinates and size are
> > > > > > > > > > > > defined by the
> > > > > > > > > > > > > > > + * context were the rectangle is used.
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > > @@ -608,35 +636,50 @@ std::ostream &operator<<(std::ostream &out,
> > > > > > > > > > > > const SizeRange &sr)
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, const Size &size)
> > > > > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > > > > size
> > > > > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > > > > >    * \param[in] size The size
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > > reference system
> > > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > >
> > > > > > > > > > > > > I think we should stick to the previous description:
> > > > > > > > > > > > > `"origin" point defined as the point with the lower x and
> > > > > > > > > > > > > lower y of the rectangle`, as `x` and `y` are signed integers.
> > > > > > > > > > > > >
> > > > > > > > > > > > > If we only support coordinates that are positive or 0, which
> > > > > > > > > > > > > I'm not sure if it's the case, how about making the type to be
> > > > > > > > > > > > > `unsigned int`?
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > To be honest I would rather make width and heigh signed to allow
> > > > > > > > > > > > constructing (x, y, -w, -h)
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >                -------------------
> > > > > > > > > > > >                |                 ^
> > > > > > > > > > > >                |            ------------->
> > > > > > > > > > > >                |           |     |
> > > > > > > > > > > >                ------<-----|-----o
> > > > > > > > > > > >                            |
> > > > > > > > > > > >                            |
> > > > > > > > > > > >                            V
> > > > > > > > > > > >
> > > > > > > > > > > > Not sure if it's useful or not though
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > Hmm... I find it pretty weird. What if all four corners have all negative
> > > > > > > > > > > coordinates?
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Don't know, maybe if the reference system where the rectangle is used
> > > > > > > > > > into has 4 planes and so an all-negative rectangle makes sense.
> > > > > > > > > >
> > > > > > > > > > My point is that we should allow users of this class to express
> > > > > > > > > > Rectangle in any context they plan to use them. Not sure if I'm going
> > > > > > > > > > overboard here or it makes sense.
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > > Yeah I agree, while doesn't that mean the description doesn't fit all
> > > > > > > > > cases, like the corner closer to the reference system origin point of a
> > > > > > > > > rectangle that has all negative coordinates is actually the "bottom-right"
> > > > > > > >
> > > > > > > > This patch aims to remove all references to "top-left" or in general
> > > > > > > > to any visual reference exactly for that purpose. Or have I forgot any
> > > > > > > > ?
> > > > > > >
> > > > > > > In this c'tor `\fn Rectangle::Rectangle(int x, int y, const Size &size)`,
> > > > > > > the description of `x` and `y` are updated to "coordinates of the origin
> > > > > > > corner", where the origin corner is "the corner closer to the reference
> > > > > > > system origin point (0, 0)."
> > > > > > >
> > > > > > > As currently libcamera::Size takes only non-negative width and height,
> > > > > > > take rectangle [(-3, -3), (-3, -1), (-1, -3), (-1, -1)] as the example, you
> > > > > > > can find that the only valid way to construct this rectangle as
> > > > > > > libcamera::Rectangle is `{x = -3, y = -3, size = {2, 2}}`. However, this
> > > > > > > doesn't fit with your updated description, as the corner closer to the
> > > > > > > reference system origin point (0, 0) is actually (-1, -1), instead of
> > > > > > > (-3, -3).
> > > > > > >
> > > > > >
> > > > > > You're right. Let's take a step back though. If we have a 4 planes reference
> > > > > > system, we always have a visual top-left indeed. As the 4 planes have
> > > > > > negative and positive coordinates, we can describe with absolute
> > > > > > positions the rectangle and all points in the system.
> > > > >
> > > > > Sorry, I still don't get your point...
> > > > >
> > > >
> > > > If you have a 4 planes system
> > > >
> > > >                       ^
> > > >                       |
> > > >                       |
> > > >                       |
> > > >                       |
> > > >         <--------------------------->
> > > >                       |
> > > >                       |
> > > >                       |
> > > >                       |
> > > >                       V
> > > >
> > > > Then you always have a top, a left, and bottom and a right, you can
> > > > describe width and height as negative or positive increments and your
> > > > rectangle is always well defined as the reference system cannot be
> > > > ambiguous. The very concept of "reference system orientation" doesn't
> > > > make sense, as a 4-planes system describes the full 2-d space.
> > > >
> > > > The ambiguity I'm trying to solve is about using a 1 plane reference
> > > > system, as depending on how the system is oriented the definition of
> > > > the "top-left" point might change, as well as the definition of the
> > > > horizontal and vertical increments change as well.
> > > >
> > > > In example:
> > > >
> > > >                       ^
> > > >                       |
> > > >                       |
> > > >                       |  o-------
> > > >                       |  |      |
> > > >                       |  --------
> > > >                       |
> > > >                       ------------------------>
> > > >
> > > >         top-left: Smaller x and higher y
> > > >         width: positive increment
> > > >         height: negative increment
> > > >
> > > >
> > > >
> > > >
> > > >                       ------------------------>
> > > >                       |  o-------
> > > >                       |  |      |
> > > >                       |  --------
> > > >                       |
> > > >                       |
> > > >                       V
> > > >
> > > >         top-left: Smaller x and smaller y
> > > >         width: positive increment
> > > >         height: positive increment
> > > >
> > > >
> > > > I thought our Rectangle definition didn't make assumptions on the
> > > > reference's system orientation and in fact that's what part of the
> > > > documentation says, but indeed the usage of "top-left" is, as shown,
> > > > ambiguous.
> > > >
> > > > So I went and changed that to be the "corner closer to the origin
> > > > point" and specified in documentation that vertical and horizontal
> > > > increments are always positive and I thought I was done with this, but
> > > > then I made the mistake of talking about negative increments and
> > > > 4-plane systems and here we are.
> > > >
> > > >
> > > > > Do you mean that the new description, like
> > > > > `The horizontal coordinate of the rectangle's origin corner`,
> > > > > only fits with the 1-plane reference system? I thought it should fit all
> > > > > 2D reference systems.
> > > >
> > > > I don't think that has never been the case, but indeed we have a
> > > > constructor that takes "signed" x and y.
> > >
> > > IIUC, you mean `you don't think that has ever been the case`, right?
> > >
> >
> >
> > No, I meant "I don't think the Rectangle class has been designed
> > to fit all 2D reference systems".
> >
> > > >
> > > > To be honest I would not be concerned about 4-planes systems, we're
> > > > talking about imaging and what is relevant here is that we should be
> > > > allowed to express rectangles on reference systems that can be
> > > > oriented differently, think of a sensor's pixel array that might be
> > > > represented with the (0, 0) position in the top-left corner compared
> > > > to a plane 2-d image that usually has its origin in the bottom-left
> > > > corner.
> > > >
> > > > I have an hard time finding a use case for expressing negative
> > > > coordinates in this usage context. Furthermore that if we introduce 4
> > > > planes we lose the ability to describe systems with different
> > > > orientation, as this:
> > > >
> > > >                       ------------------------>
> > > >                       |  o-------
> > > >                       |  |      |
> > > >                       |  --------
> > > >                       |
> > > >                       |
> > > >                       V
> > > >
> > > > when expressed in a 4-planes system becomes
> > > >
> > > >                       ^
> > > >                       |
> > > >                       |
> > > >                       |
> > > >                       |
> > > >         <--------------------------->
> > > >                       |/////////////
> > > >                       |/////////////
> > > >                       |// this /////
> > > >                       |/////////////
> > > >                       |/////////////
> > > >                       V
> > > >
> > > > And would require you to express y and height in negative coordinates.
> > > > Sincerely, I would not go there.
> > > >
> > > > I can specify that the Rectangle class reference system is always a
> > > > 2-d plane with positively increasing x and y axes instead.
> > >
> > > Yeah I think specifying that is a great idea, and maybe a TODO to
> > > set `x` and `y` to be unsigned int.
> >
> > I can try to do this right away and see if any compiler complains
> > about that.
> >
> > > I hope no pipeline handlers is using signed coordinates when we
> > > make the change in the API.
> >
> > However, geometry.h is public API, some applications might be affected
> > by this change.
> >
> > >
> > > Sorry for the chaos.
> > >
> >
> > np, if it helps to make the final result better chaos is welcome.
>
> Seems like I made even more chaos
>
> I tried to standardize the gemotry library to work with a single
> quadrant (what I called 'plane' in the previous email is actually a
> 'quadrant') but it's a mess, we translate and move rectangles and
> defining the behaviour when it happens to get into negative
> coordinates is tricky and I don't like the result.
>
> I also have gone through the issue with Laurent and it's probably
> better to take a step back
>
> 1) let's define top-left as the point with smallest x and smallest y
> (even if it's not actually top-left), I'll send a patch to update the doc

Yes, this is more ideal in my opinion, and it's what I expected :)

> 2) You 2 points constructors could be re-implemented on this by taking
> the min(p1.x, p2.x) and min(p1.y, p2.y), this shouldn't be ambiguous
> anymore if we always take the "smallest" point
> 4) with your ack I'll rebase your series on my patch and will send out
> a new version

Sure, thanks for the effort!

>
> once reviewed I'll merge them
>
> Thanks and sorry for this long thread

No worries. It's nice to discuss and find the best way to go with
together!

>
> >
> > > >
> > > > >
> > > > > >
> > > > > > The problem at hands now is relevant for 1-planes reference systems,
> > > > > > that can be oriented differently, in example with the origin point
> > > > > > being in top-left or bottom-left positions, as per the examples above.
> > > > > > In this case I think we agree that "top-left" is ambiguous. The x and
> > > > > > y coordinates are always positive in the case with a single plane.
> > > > > >
> > > > > > I think we should also be concerned with 1 plane reference systems and
> > > > > > move forward with this patch that removes references to the visual
> > > > > > "top-left" and assumes increments in width and height are always
> > > > > > positive.
> > > > > >
> > > > > > > >
> > > > > > > > > corner, and currently libcamera::Size only allows non-negative width and
> > > > > > > > > height [1].
> > > > > > > >
> > > > > > > > True, Size uses unsigned int. I don't think it's a big deal and I'm
> > > > > > > > not proposing to introduce a new constructor with signed width and
> > > > > > > > height now, but my point is that if the need arises we can now do
> > > > > > > > that.
> > > > > > > >
> > > > > > > > >
> > > > > > > > > [1]:
> > > > > > > > > https://git.libcamera.org/libcamera/libcamera.git/tree/include/libcamera/geometry.h#n65
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > > BR,
> > > > > > > > > > > > > Harvey
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > >    * \fn Rectangle::Rectangle(int x, int y, unsigned int width,
> > > > > > > > > > > > unsigned int height)
> > > > > > > > > > > > > > >    * \brief Construct a Rectangle with the given position and
> > > > > > > > > > size
> > > > > > > > > > > > > > > - * \param[in] x The horizontal coordinate of the top-left corner
> > > > > > > > > > > > > > > - * \param[in] y The vertical coordinate of the top-left corner
> > > > > > > > > > > > > > > + * \param[in] x The horizontal coordinate of the origin corner
> > > > > > > > > > > > > > > + * \param[in] y The vertical coordinate of the origin corner
> > > > > > > > > > > > > > >    * \param[in] width The width
> > > > > > > > > > > > > > >    * \param[in] height The height
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > > reference system
> > > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > >    * \fn Rectangle::Rectangle(const Size &size)
> > > > > > > > > > > > > > > - * \brief Construct a Rectangle of \a size with its top left
> > > > > > > > > > corner
> > > > > > > > > > > > located
> > > > > > > > > > > > > > > + * \brief Construct a Rectangle of \a size with its origin
> > > > > > > > > > corner
> > > > > > > > > > > > located
> > > > > > > > > > > > > > >    * at (0,0)
> > > > > > > > > > > > > > >    * \param[in] size The desired Rectangle size
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > > reference system
> > > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > >    * \var Rectangle::x
> > > > > > > > > > > > > > > - * \brief The horizontal coordinate of the rectangle's top-left
> > > > > > > > > > > > corner
> > > > > > > > > > > > > > > + * \brief The horizontal coordinate of the rectangle's origin
> > > > > > > > > > corner
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > > reference system
> > > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > >    * \var Rectangle::y
> > > > > > > > > > > > > > > - * \brief The vertical coordinate of the rectangle's top-left
> > > > > > > > > > corner
> > > > > > > > > > > > > > > + * \brief The vertical coordinate of the rectangle's origin
> > > > > > > > > > corner
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > > reference system
> > > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > > @@ -683,9 +726,13 @@ Point Rectangle::center() const
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > > - * \fn Point Rectangle::topLeft() const
> > > > > > > > > > > > > > > - * \brief Retrieve the coordinates of the top left corner of
> > > > > > > > > > this
> > > > > > > > > > > > Rectangle
> > > > > > > > > > > > > > > - * \return The Rectangle's top left corner
> > > > > > > > > > > > > > > + * \fn Point Rectangle::origin() const
> > > > > > > > > > > > > > > + * \brief Retrieve the coordinates of the origin corner of this
> > > > > > > > > > > > Rectangle
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * The rectangle's origin corner is the corner closer to the
> > > > > > > > > > > > reference system
> > > > > > > > > > > > > > > + * origin point (0, 0).
> > > > > > > > > > > > > > > + *
> > > > > > > > > > > > > > > + * \return The Rectangle's origin corner
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > I think you can drop "corner" from "origin corner"
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Probably throughout the patch:
> > > > > > > > > > > > > >      s/origin corner/origin/
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Otherwise, LGTM
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > > @@ -740,15 +787,15 @@ Rectangle &Rectangle::translateBy(const
> > > > > > > > > > Point
> > > > > > > > > > > > &point)
> > > > > > > > > > > > > > >    */
> > > > > > > > > > > > > > >   Rectangle Rectangle::boundedTo(const Rectangle &bound) const
> > > > > > > > > > > > > > >   {
> > > > > > > > > > > > > > > -     int topLeftX = std::max(x, bound.x);
> > > > > > > > > > > > > > > -     int topLeftY = std::max(y, bound.y);
> > > > > > > > > > > > > > > +     int originX = std::max(x, bound.x);
> > > > > > > > > > > > > > > +     int originY = std::max(y, bound.y);
> > > > > > > > > > > > > > >       int bottomRightX = std::min<int>(x + width, bound.x +
> > > > > > > > > > > > bound.width);
> > > > > > > > > > > > > > >       int bottomRightY = std::min<int>(y + height, bound.y +
> > > > > > > > > > > > bound.height);
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > -     unsigned int newWidth = std::max(bottomRightX - topLeftX,
> > > > > > > > > > 0);
> > > > > > > > > > > > > > > -     unsigned int newHeight = std::max(bottomRightY - topLeftY,
> > > > > > > > > > 0);
> > > > > > > > > > > > > > > +     unsigned int newWidth = std::max(bottomRightX - originX,
> > > > > > > > > > 0);
> > > > > > > > > > > > > > > +     unsigned int newHeight = std::max(bottomRightY - originY,
> > > > > > > > > > 0);
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > -     return { topLeftX, topLeftY, newWidth, newHeight };
> > > > > > > > > > > > > > > +     return { originX, originY, newWidth, newHeight };
> > > > > > > > > > > > > > >   }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >   /**
> > > > > > > > > > > > > > > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > > > index 3041fd1ed9fd..8d2440026689 100644
> > > > > > > > > > > > > > > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > > > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > > > > > > > > > > > > > > @@ -1289,7 +1289,7 @@ Rectangle CameraData::scaleIspCrop(const
> > > > > > > > > > > > Rectangle &ispCrop) const
> > > > > > > > > > > > > > >        */
> > > > > > > > > > > > > > >       Rectangle nativeCrop =
> > > > > > > > > > > > ispCrop.scaledBy(sensorInfo_.analogCrop.size(),
> > > > > > > > > > > > > > >
> > > > > > > > > > > >  sensorInfo_.outputSize);
> > > > > > > > > > > > > > > -     nativeCrop.translateBy(sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > > > > +     nativeCrop.translateBy(sensorInfo_.analogCrop.origin());
> > > > > > > > > > > > > > >       return nativeCrop;
> > > > > > > > > > > > > > >   }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > @@ -1303,7 +1303,7 @@ void CameraData::applyScalerCrop(const
> > > > > > > > > > > > ControlList &controls)
> > > > > > > > > > > > > > >                       nativeCrop = { 0, 0, 1, 1 };
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >               /* Create a version of the crop scaled to ISP
> > > > > > > > > > (camera
> > > > > > > > > > > > mode) pixels. */
> > > > > > > > > > > > > > > -             Rectangle ispCrop =
> > > > > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.topLeft());
> > > > > > > > > > > > > > > +             Rectangle ispCrop =
> > > > > > > > > > > > nativeCrop.translatedBy(-sensorInfo_.analogCrop.origin());
> > > > > > > > > > > > > > >               ispCrop.scaleBy(sensorInfo_.outputSize,
> > > > > > > > > > > > sensorInfo_.analogCrop.size());
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >               /*
> > > > > > > > > > > > > > > diff --git a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > > > index c7e303609427..8dee365b25dd 100644
> > > > > > > > > > > > > > > --- a/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > > > +++ b/src/py/libcamera/py_geometry.cpp
> > > > > > > > > > > > > > > @@ -105,7 +105,7 @@ void init_py_geometry(py::module &m)
> > > > > > > > > > > > > > >               .def_property_readonly("is_null",
> > > > > > > > > > &Rectangle::isNull)
> > > > > > > > > > > > > > >               .def_property_readonly("center",
> > > > > > > > > > &Rectangle::center)
> > > > > > > > > > > > > > >               .def_property_readonly("size", &Rectangle::size)
> > > > > > > > > > > > > > > -             .def_property_readonly("topLeft",
> > > > > > > > > > &Rectangle::topLeft)
> > > > > > > > > > > > > > > +             .def_property_readonly("origin",
> > > > > > > > > > &Rectangle::origin)
> > > > > > > > > > > > > > >               .def("scale_by", &Rectangle::scaleBy)
> > > > > > > > > > > > > > >               .def("translate_by", &Rectangle::translateBy)
> > > > > > > > > > > > > > >               .def("bounded_to", &Rectangle::boundedTo)
> > > > > > > > > > > > > > > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > > > > > > > > > > > > > > index 64169206ad16..a4ee6f6e167a 100644
> > > > > > > > > > > > > > > --- a/test/geometry.cpp
> > > > > > > > > > > > > > > +++ b/test/geometry.cpp
> > > > > > > > > > > > > > > @@ -363,16 +363,16 @@ protected:
> > > > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > > > >               }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > -             /* Rectangle::size(), Rectangle::topLeft() and
> > > > > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > > > > > +             /* Rectangle::size(), Rectangle::origin() and
> > > > > > > > > > > > Rectangle::center() tests */
> > > > > > > > > > > > > > >               if (Rectangle(-1, -2, 3, 4).size() != Size(3, 4) ||
> > > > > > > > > > > > > > >                   Rectangle(0, 0, 100000, 200000).size() !=
> > > > > > > > > > > > Size(100000, 200000)) {
> > > > > > > > > > > > > > >                       cout << "Rectangle::size() test failed" <<
> > > > > > > > > > > > endl;
> > > > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > > > >               }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > -             if (Rectangle(1, 2, 3, 4).topLeft() != Point(1, 2)
> > > > > > > > > > ||
> > > > > > > > > > > > > > > -                 Rectangle(-1, -2, 3, 4).topLeft() != Point(-1,
> > > > > > > > > > > > -2)) {
> > > > > > > > > > > > > > > -                     cout << "Rectangle::topLeft() test failed"
> > > > > > > > > > <<
> > > > > > > > > > > > endl;
> > > > > > > > > > > > > > > +             if (Rectangle(1, 2, 3, 4).origin() != Point(1, 2)
> > > > > > > > > > ||
> > > > > > > > > > > > > > > +                 Rectangle(-1, -2, 3, 4).origin() != Point(-1,
> > > > > > > > > > -2))
> > > > > > > > > > > > {
> > > > > > > > > > > > > > > +                     cout << "Rectangle::origin() test failed"
> > > > > > > > > > <<
> > > > > > > > > > > > endl;
> > > > > > > > > > > > > > >                       return TestFail;
> > > > > > > > > > > > > > >               }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > --
> > > > > > > > > > > > > > > 2.46.1
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > --
> > > > > > > > > > > > > BR,
> > > > > > > > > > > > > Harvey Yang
> > > > > > > > > > > >
> > > > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > --
> > > > > > > BR,
> > > > > > > Harvey Yang
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > BR,
> > > > > Harvey Yang
> > >
> > >
> > >
> > > --
> > > BR,
> > > Harvey Yang



--
BR,
Harvey Yang