| Message ID | 20260807075935.2553938-1-stefan.klug@ideasonboard.com |
|---|---|
| State | Accepted |
| Headers | show |
| Series |
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| Related | show |
2026. 08. 07. 9:59 keltezéssel, Stefan Klug írta: > CameraSensorLegacy and CameraSensorRaw support flipping on the sensor > side only if the driver supports both, V4L2_CID_HFLIP and > V4L2_CID_VFLIP. In cases where a driver only supports a single flip > mode, flipping support gets disabled completely. This is unexpected and > annoying when validating sensor drivers. > > Fix that by handling vertical and horizontal flips separately. > > Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> > Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com> > > --- Looks ok to me. Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> > > Changes in v4: > - Fixed bug that used V4L2_CID_HFLIP instead of V4L2_CID_VFLIP > introduced in v2 > - Collected tag > > Changes in v3: > - Swapped if and replaced ternary operator by || in support logic > - Improved description in sensor_driver_requirements > > Changes in v2: > - Replaced duplicate query flip code with lambda > - Reworked apply flip code to call setControls only once > - Replaced a & by && > - Applied the change to CameraSensorRaw as well > - Small comment/logging changes > --- > > Hi all, > > I had this patch somewhere in my tree for a long time. Now I stumbled > over this issue again and had to manually rebase the changes. So maybe > it is time to upstream :-) > > Version 4 fixes a copy paste bug introduced in v2. > > Best regards, > Stefan > > Documentation/sensor_driver_requirements.rst | 2 + > src/libcamera/sensor/camera_sensor_legacy.cpp | 76 ++++++++++-------- > src/libcamera/sensor/camera_sensor_raw.cpp | 79 +++++++++++-------- > 3 files changed, 90 insertions(+), 67 deletions(-) > > diff --git a/Documentation/sensor_driver_requirements.rst b/Documentation/sensor_driver_requirements.rst > index 0e516b34a215..1caa2f96d682 100644 > --- a/Documentation/sensor_driver_requirements.rst > +++ b/Documentation/sensor_driver_requirements.rst > @@ -73,6 +73,8 @@ In order to support rotating the image the sensor driver should support > The controls must be writable from userspace. In case of a RAW Bayer sensors, > drivers should correctly report if vertical/horizontal flips modify the Bayer > pattern ordering by reporting the `V4L2_CTRL_FLAG_MODIFY_LAYOUT` control flag. > +If the flag is set for one of the two controls, it shall be set for the other > +one as well. > > The sensor driver should implement support for the V4L2 Selection API, > specifically it should implement support for the > diff --git a/src/libcamera/sensor/camera_sensor_legacy.cpp b/src/libcamera/sensor/camera_sensor_legacy.cpp > index 6a683821f219..4338abc523a8 100644 > --- a/src/libcamera/sensor/camera_sensor_legacy.cpp > +++ b/src/libcamera/sensor/camera_sensor_legacy.cpp > @@ -133,7 +133,8 @@ private: > Size pixelArraySize_; > Rectangle activeArea_; > const BayerFormat *bayerFormat_; > - bool supportFlips_; > + bool supportHFlips_; > + bool supportVFlips_; > bool flipsAlterBayerOrder_; > Orientation mountingOrientation_; > > @@ -153,7 +154,7 @@ private: > > CameraSensorLegacy::CameraSensorLegacy(const MediaEntity *entity) > : entity_(entity), pad_(UINT_MAX), staticProps_(nullptr), > - bayerFormat_(nullptr), supportFlips_(false), > + bayerFormat_(nullptr), supportHFlips_(false), supportVFlips_(false), > flipsAlterBayerOrder_(false), properties_(properties::properties) > { > } > @@ -359,26 +360,31 @@ int CameraSensorLegacy::validateSensorDriver() > } > } > > - /* > - * Verify if sensor supports horizontal/vertical flips > - * > - * \todo Handle horizontal and vertical flips independently. > - */ > - const struct v4l2_query_ext_ctrl *hflipInfo = subdev_->controlInfo(V4L2_CID_HFLIP); > - const struct v4l2_query_ext_ctrl *vflipInfo = subdev_->controlInfo(V4L2_CID_VFLIP); > - if (hflipInfo && !(hflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) && > - vflipInfo && !(vflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY)) { > - supportFlips_ = true; > + /* Verify if sensor supports horizontal/vertical flips. */ > + auto queryFlip = [&](uint32_t id, const char *name) -> std::pair<bool, bool> { > + const struct v4l2_query_ext_ctrl *flipInfo = subdev_->controlInfo(id); > + if (!flipInfo || flipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) { > + LOG(CameraSensor, Debug) > + << "Camera sensor does not support " << name << " flip"; > + return { false, false }; > + } > > - if (hflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT || > - vflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT) > - flipsAlterBayerOrder_ = true; > + return { true, flipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT }; > + }; > + > + auto hflip = queryFlip(V4L2_CID_HFLIP, "horizontal"); > + auto vflip = queryFlip(V4L2_CID_VFLIP, "vertical"); > + > + if (hflip.first && vflip.first && (hflip.second != vflip.second)) { > + LOG(CameraSensor, Error) > + << "Flips with differing alter bayer order properties" > + << " are unsupported. Disabling flipping."; > + } else { > + supportHFlips_ = hflip.first; > + supportVFlips_ = vflip.first; > + flipsAlterBayerOrder_ = hflip.second || vflip.second; > } > > - if (!supportFlips_) > - LOG(CameraSensor, Debug) > - << "Camera sensor does not support horizontal/vertical flip"; > - > /* > * Make sure the required selection targets are supported. > * > @@ -759,14 +765,16 @@ CameraSensorLegacy::getFormat(Span<const unsigned int> mbusCodes, > int CameraSensorLegacy::setFormat(V4L2SubdeviceFormat *format, Transform transform) > { > /* Configure flips if the sensor supports that. */ > - if (supportFlips_) { > - ControlList flipCtrls(subdev_->controls()); > - > + ControlList flipCtrls(subdev_->controls()); > + if (supportHFlips_) > flipCtrls.set(V4L2_CID_HFLIP, > static_cast<int32_t>(!!(transform & Transform::HFlip))); > + > + if (supportVFlips_) > flipCtrls.set(V4L2_CID_VFLIP, > static_cast<int32_t>(!!(transform & Transform::VFlip))); > > + if (!flipCtrls.empty()) { > int ret = subdev_->setControls(&flipCtrls); > if (ret) > return ret; > @@ -937,17 +945,8 @@ int CameraSensorLegacy::sensorInfo(IPACameraSensorInfo *info) const > Transform CameraSensorLegacy::computeTransform(Orientation *orientation) const > { > /* > - * If we cannot do any flips we cannot change the native camera mounting > - * orientation. > - */ > - if (!supportFlips_) { > - *orientation = mountingOrientation_; > - return Transform::Identity; > - } > - > - /* > - * Now compute the required transform to obtain 'orientation' starting > - * from the mounting rotation. > + * Compute the required transform to obtain 'orientation' starting from > + * the mounting rotation. > * > * As a note: > * orientation / mountingOrientation_ = transform > @@ -955,6 +954,17 @@ Transform CameraSensorLegacy::computeTransform(Orientation *orientation) const > */ > Transform transform = *orientation / mountingOrientation_; > > + /* If we cannot do the required flips, fall back to identity. */ > + if (!supportHFlips_ && !!(transform & Transform::HFlip)) { > + *orientation = mountingOrientation_; > + return Transform::Identity; > + } > + > + if (!supportVFlips_ && !!(transform & Transform::VFlip)) { > + *orientation = mountingOrientation_; > + return Transform::Identity; > + } > + > /* > * If transform contains any Transpose we cannot do it, so adjust > * 'orientation' to report the image native orientation and return Identity. > diff --git a/src/libcamera/sensor/camera_sensor_raw.cpp b/src/libcamera/sensor/camera_sensor_raw.cpp > index 10eba0331fe8..849423dd20cf 100644 > --- a/src/libcamera/sensor/camera_sensor_raw.cpp > +++ b/src/libcamera/sensor/camera_sensor_raw.cpp > @@ -144,7 +144,8 @@ private: > Size pixelArraySize_; > Rectangle activeArea_; > BayerFormat::Order cfaPattern_; > - bool supportFlips_; > + bool supportHFlips_; > + bool supportVFlips_; > bool flipsAlterBayerOrder_; > Orientation mountingOrientation_; > > @@ -162,8 +163,9 @@ private: > */ > > CameraSensorRaw::CameraSensorRaw(const MediaEntity *entity) > - : entity_(entity), staticProps_(nullptr), supportFlips_(false), > - flipsAlterBayerOrder_(false), properties_(properties::properties) > + : entity_(entity), staticProps_(nullptr), supportHFlips_(false), > + supportVFlips_(false), flipsAlterBayerOrder_(false), > + properties_(properties::properties) > { > } > > @@ -479,26 +481,31 @@ std::optional<int> CameraSensorRaw::init() > return { ret }; > } > > - /* > - * Verify if sensor supports horizontal/vertical flips > - * > - * \todo Handle horizontal and vertical flips independently. > - */ > - const struct v4l2_query_ext_ctrl *hflipInfo = subdev_->controlInfo(V4L2_CID_HFLIP); > - const struct v4l2_query_ext_ctrl *vflipInfo = subdev_->controlInfo(V4L2_CID_VFLIP); > - if (hflipInfo && !(hflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) && > - vflipInfo && !(vflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY)) { > - supportFlips_ = true; > + /* Verify if sensor supports horizontal/vertical flips. */ > + auto queryFlip = [&](uint32_t id, const char *name) -> std::pair<bool, bool> { > + const struct v4l2_query_ext_ctrl *flipInfo = subdev_->controlInfo(id); > + if (!flipInfo || flipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) { > + LOG(CameraSensor, Debug) > + << "Camera sensor does not support " << name << " flip"; > + return { false, false }; > + } > > - if (hflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT || > - vflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT) > - flipsAlterBayerOrder_ = true; > + return { true, flipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT }; > + }; > + > + auto hflip = queryFlip(V4L2_CID_HFLIP, "horizontal"); > + auto vflip = queryFlip(V4L2_CID_VFLIP, "vertical"); > + > + if (hflip.first && vflip.first && (hflip.second != vflip.second)) { > + LOG(CameraSensor, Error) > + << "Flips with differing alter bayer order properties" > + << " are unsupported. Disabling flipping."; > + } else { > + supportHFlips_ = hflip.first; > + supportVFlips_ = vflip.first; > + flipsAlterBayerOrder_ = hflip.second || vflip.second; > } > > - if (!supportFlips_) > - LOG(CameraSensor, Debug) > - << "Camera sensor does not support horizontal/vertical flip"; > - > /* > * 5. Discover ancillary devices. > * > @@ -819,14 +826,16 @@ CameraSensorRaw::getFormat(Span<const unsigned int> mbusCodes, > int CameraSensorRaw::setFormat(V4L2SubdeviceFormat *format, Transform transform) > { > /* Configure flips if the sensor supports that. */ > - if (supportFlips_) { > - ControlList flipCtrls(subdev_->controls()); > - > + ControlList flipCtrls(subdev_->controls()); > + if (supportHFlips_) > flipCtrls.set(V4L2_CID_HFLIP, > static_cast<int32_t>(!!(transform & Transform::HFlip))); > + > + if (supportVFlips_) > flipCtrls.set(V4L2_CID_VFLIP, > static_cast<int32_t>(!!(transform & Transform::VFlip))); > > + if (!flipCtrls.empty()) { > int ret = subdev_->setControls(&flipCtrls); > if (ret) > return ret; > @@ -1054,17 +1063,8 @@ int CameraSensorRaw::sensorInfo(IPACameraSensorInfo *info) const > Transform CameraSensorRaw::computeTransform(Orientation *orientation) const > { > /* > - * If we cannot do any flips we cannot change the native camera mounting > - * orientation. > - */ > - if (!supportFlips_) { > - *orientation = mountingOrientation_; > - return Transform::Identity; > - } > - > - /* > - * Now compute the required transform to obtain 'orientation' starting > - * from the mounting rotation. > + * Compute the required transform to obtain 'orientation' starting from > + * the mounting rotation. > * > * As a note: > * orientation / mountingOrientation_ = transform > @@ -1072,6 +1072,17 @@ Transform CameraSensorRaw::computeTransform(Orientation *orientation) const > */ > Transform transform = *orientation / mountingOrientation_; > > + /* If we cannot do the required flips, fall back to identity. */ > + if (!supportHFlips_ && !!(transform & Transform::HFlip)) { > + *orientation = mountingOrientation_; > + return Transform::Identity; > + } > + > + if (!supportVFlips_ && !!(transform & Transform::VFlip)) { > + *orientation = mountingOrientation_; > + return Transform::Identity; > + } > + > /* > * If transform contains any Transpose we cannot do it, so adjust > * 'orientation' to report the image native orientation and return Identity.
diff --git a/Documentation/sensor_driver_requirements.rst b/Documentation/sensor_driver_requirements.rst index 0e516b34a215..1caa2f96d682 100644 --- a/Documentation/sensor_driver_requirements.rst +++ b/Documentation/sensor_driver_requirements.rst @@ -73,6 +73,8 @@ In order to support rotating the image the sensor driver should support The controls must be writable from userspace. In case of a RAW Bayer sensors, drivers should correctly report if vertical/horizontal flips modify the Bayer pattern ordering by reporting the `V4L2_CTRL_FLAG_MODIFY_LAYOUT` control flag. +If the flag is set for one of the two controls, it shall be set for the other +one as well. The sensor driver should implement support for the V4L2 Selection API, specifically it should implement support for the diff --git a/src/libcamera/sensor/camera_sensor_legacy.cpp b/src/libcamera/sensor/camera_sensor_legacy.cpp index 6a683821f219..4338abc523a8 100644 --- a/src/libcamera/sensor/camera_sensor_legacy.cpp +++ b/src/libcamera/sensor/camera_sensor_legacy.cpp @@ -133,7 +133,8 @@ private: Size pixelArraySize_; Rectangle activeArea_; const BayerFormat *bayerFormat_; - bool supportFlips_; + bool supportHFlips_; + bool supportVFlips_; bool flipsAlterBayerOrder_; Orientation mountingOrientation_; @@ -153,7 +154,7 @@ private: CameraSensorLegacy::CameraSensorLegacy(const MediaEntity *entity) : entity_(entity), pad_(UINT_MAX), staticProps_(nullptr), - bayerFormat_(nullptr), supportFlips_(false), + bayerFormat_(nullptr), supportHFlips_(false), supportVFlips_(false), flipsAlterBayerOrder_(false), properties_(properties::properties) { } @@ -359,26 +360,31 @@ int CameraSensorLegacy::validateSensorDriver() } } - /* - * Verify if sensor supports horizontal/vertical flips - * - * \todo Handle horizontal and vertical flips independently. - */ - const struct v4l2_query_ext_ctrl *hflipInfo = subdev_->controlInfo(V4L2_CID_HFLIP); - const struct v4l2_query_ext_ctrl *vflipInfo = subdev_->controlInfo(V4L2_CID_VFLIP); - if (hflipInfo && !(hflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) && - vflipInfo && !(vflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY)) { - supportFlips_ = true; + /* Verify if sensor supports horizontal/vertical flips. */ + auto queryFlip = [&](uint32_t id, const char *name) -> std::pair<bool, bool> { + const struct v4l2_query_ext_ctrl *flipInfo = subdev_->controlInfo(id); + if (!flipInfo || flipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) { + LOG(CameraSensor, Debug) + << "Camera sensor does not support " << name << " flip"; + return { false, false }; + } - if (hflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT || - vflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT) - flipsAlterBayerOrder_ = true; + return { true, flipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT }; + }; + + auto hflip = queryFlip(V4L2_CID_HFLIP, "horizontal"); + auto vflip = queryFlip(V4L2_CID_VFLIP, "vertical"); + + if (hflip.first && vflip.first && (hflip.second != vflip.second)) { + LOG(CameraSensor, Error) + << "Flips with differing alter bayer order properties" + << " are unsupported. Disabling flipping."; + } else { + supportHFlips_ = hflip.first; + supportVFlips_ = vflip.first; + flipsAlterBayerOrder_ = hflip.second || vflip.second; } - if (!supportFlips_) - LOG(CameraSensor, Debug) - << "Camera sensor does not support horizontal/vertical flip"; - /* * Make sure the required selection targets are supported. * @@ -759,14 +765,16 @@ CameraSensorLegacy::getFormat(Span<const unsigned int> mbusCodes, int CameraSensorLegacy::setFormat(V4L2SubdeviceFormat *format, Transform transform) { /* Configure flips if the sensor supports that. */ - if (supportFlips_) { - ControlList flipCtrls(subdev_->controls()); - + ControlList flipCtrls(subdev_->controls()); + if (supportHFlips_) flipCtrls.set(V4L2_CID_HFLIP, static_cast<int32_t>(!!(transform & Transform::HFlip))); + + if (supportVFlips_) flipCtrls.set(V4L2_CID_VFLIP, static_cast<int32_t>(!!(transform & Transform::VFlip))); + if (!flipCtrls.empty()) { int ret = subdev_->setControls(&flipCtrls); if (ret) return ret; @@ -937,17 +945,8 @@ int CameraSensorLegacy::sensorInfo(IPACameraSensorInfo *info) const Transform CameraSensorLegacy::computeTransform(Orientation *orientation) const { /* - * If we cannot do any flips we cannot change the native camera mounting - * orientation. - */ - if (!supportFlips_) { - *orientation = mountingOrientation_; - return Transform::Identity; - } - - /* - * Now compute the required transform to obtain 'orientation' starting - * from the mounting rotation. + * Compute the required transform to obtain 'orientation' starting from + * the mounting rotation. * * As a note: * orientation / mountingOrientation_ = transform @@ -955,6 +954,17 @@ Transform CameraSensorLegacy::computeTransform(Orientation *orientation) const */ Transform transform = *orientation / mountingOrientation_; + /* If we cannot do the required flips, fall back to identity. */ + if (!supportHFlips_ && !!(transform & Transform::HFlip)) { + *orientation = mountingOrientation_; + return Transform::Identity; + } + + if (!supportVFlips_ && !!(transform & Transform::VFlip)) { + *orientation = mountingOrientation_; + return Transform::Identity; + } + /* * If transform contains any Transpose we cannot do it, so adjust * 'orientation' to report the image native orientation and return Identity. diff --git a/src/libcamera/sensor/camera_sensor_raw.cpp b/src/libcamera/sensor/camera_sensor_raw.cpp index 10eba0331fe8..849423dd20cf 100644 --- a/src/libcamera/sensor/camera_sensor_raw.cpp +++ b/src/libcamera/sensor/camera_sensor_raw.cpp @@ -144,7 +144,8 @@ private: Size pixelArraySize_; Rectangle activeArea_; BayerFormat::Order cfaPattern_; - bool supportFlips_; + bool supportHFlips_; + bool supportVFlips_; bool flipsAlterBayerOrder_; Orientation mountingOrientation_; @@ -162,8 +163,9 @@ private: */ CameraSensorRaw::CameraSensorRaw(const MediaEntity *entity) - : entity_(entity), staticProps_(nullptr), supportFlips_(false), - flipsAlterBayerOrder_(false), properties_(properties::properties) + : entity_(entity), staticProps_(nullptr), supportHFlips_(false), + supportVFlips_(false), flipsAlterBayerOrder_(false), + properties_(properties::properties) { } @@ -479,26 +481,31 @@ std::optional<int> CameraSensorRaw::init() return { ret }; } - /* - * Verify if sensor supports horizontal/vertical flips - * - * \todo Handle horizontal and vertical flips independently. - */ - const struct v4l2_query_ext_ctrl *hflipInfo = subdev_->controlInfo(V4L2_CID_HFLIP); - const struct v4l2_query_ext_ctrl *vflipInfo = subdev_->controlInfo(V4L2_CID_VFLIP); - if (hflipInfo && !(hflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) && - vflipInfo && !(vflipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY)) { - supportFlips_ = true; + /* Verify if sensor supports horizontal/vertical flips. */ + auto queryFlip = [&](uint32_t id, const char *name) -> std::pair<bool, bool> { + const struct v4l2_query_ext_ctrl *flipInfo = subdev_->controlInfo(id); + if (!flipInfo || flipInfo->flags & V4L2_CTRL_FLAG_READ_ONLY) { + LOG(CameraSensor, Debug) + << "Camera sensor does not support " << name << " flip"; + return { false, false }; + } - if (hflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT || - vflipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT) - flipsAlterBayerOrder_ = true; + return { true, flipInfo->flags & V4L2_CTRL_FLAG_MODIFY_LAYOUT }; + }; + + auto hflip = queryFlip(V4L2_CID_HFLIP, "horizontal"); + auto vflip = queryFlip(V4L2_CID_VFLIP, "vertical"); + + if (hflip.first && vflip.first && (hflip.second != vflip.second)) { + LOG(CameraSensor, Error) + << "Flips with differing alter bayer order properties" + << " are unsupported. Disabling flipping."; + } else { + supportHFlips_ = hflip.first; + supportVFlips_ = vflip.first; + flipsAlterBayerOrder_ = hflip.second || vflip.second; } - if (!supportFlips_) - LOG(CameraSensor, Debug) - << "Camera sensor does not support horizontal/vertical flip"; - /* * 5. Discover ancillary devices. * @@ -819,14 +826,16 @@ CameraSensorRaw::getFormat(Span<const unsigned int> mbusCodes, int CameraSensorRaw::setFormat(V4L2SubdeviceFormat *format, Transform transform) { /* Configure flips if the sensor supports that. */ - if (supportFlips_) { - ControlList flipCtrls(subdev_->controls()); - + ControlList flipCtrls(subdev_->controls()); + if (supportHFlips_) flipCtrls.set(V4L2_CID_HFLIP, static_cast<int32_t>(!!(transform & Transform::HFlip))); + + if (supportVFlips_) flipCtrls.set(V4L2_CID_VFLIP, static_cast<int32_t>(!!(transform & Transform::VFlip))); + if (!flipCtrls.empty()) { int ret = subdev_->setControls(&flipCtrls); if (ret) return ret; @@ -1054,17 +1063,8 @@ int CameraSensorRaw::sensorInfo(IPACameraSensorInfo *info) const Transform CameraSensorRaw::computeTransform(Orientation *orientation) const { /* - * If we cannot do any flips we cannot change the native camera mounting - * orientation. - */ - if (!supportFlips_) { - *orientation = mountingOrientation_; - return Transform::Identity; - } - - /* - * Now compute the required transform to obtain 'orientation' starting - * from the mounting rotation. + * Compute the required transform to obtain 'orientation' starting from + * the mounting rotation. * * As a note: * orientation / mountingOrientation_ = transform @@ -1072,6 +1072,17 @@ Transform CameraSensorRaw::computeTransform(Orientation *orientation) const */ Transform transform = *orientation / mountingOrientation_; + /* If we cannot do the required flips, fall back to identity. */ + if (!supportHFlips_ && !!(transform & Transform::HFlip)) { + *orientation = mountingOrientation_; + return Transform::Identity; + } + + if (!supportVFlips_ && !!(transform & Transform::VFlip)) { + *orientation = mountingOrientation_; + return Transform::Identity; + } + /* * If transform contains any Transpose we cannot do it, so adjust * 'orientation' to report the image native orientation and return Identity.