[v2,06/37] libcamera: MappedFrameBuffer: Add MappedFrameBuffer::getPlaneFD()
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Message ID 20250824-b4-v0-5-2-gpuisp-v2-a-v2-6-96f4576c814e@linaro.org
State New
Headers show
Series
  • Add GLES 2.0 GPUISP to libcamera
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Commit Message

Bryan O'Donoghue Aug. 24, 2025, 12:48 a.m. UTC 
Add MappedFrameBuffer::getPlaneFD() which takes a plane index and returns
the file descriptor associated with it.

This fd will be used to feed into eglCreateImageKHR for both texture
creation on upload and directly render-to-texture where the texture buffer
comes from the fd given to eglCreateImageKHR.

Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 include/libcamera/internal/mapped_framebuffer.h |  4 ++++
 src/libcamera/mapped_framebuffer.cpp            | 10 ++++++++++
 2 files changed, 14 insertions(+)

Patch
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diff --git a/include/libcamera/internal/mapped_framebuffer.h b/include/libcamera/internal/mapped_framebuffer.h
index 6aaabf5086b4658363e4e2ed02242248bfffdcbc..f7a6870764c4d035f77544354aa46a70095952a0 100644
--- a/include/libcamera/internal/mapped_framebuffer.h
+++ b/include/libcamera/internal/mapped_framebuffer.h
@@ -55,6 +55,10 @@  public:
 	using MapFlags = Flags<MapFlag>;
 
 	MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags);
+	int getPlaneFD(unsigned int plane);
+
+private:
+	const FrameBuffer *buffer_;
 };
 
 LIBCAMERA_FLAGS_ENABLE_OPERATORS(MappedFrameBuffer::MapFlag)
diff --git a/src/libcamera/mapped_framebuffer.cpp b/src/libcamera/mapped_framebuffer.cpp
index f54bbf21f10987aecdf02c0a946edbb4931dd4c0..e85030d904ffaa5cd8cfae7b02d4b1b7010452a5 100644
--- a/src/libcamera/mapped_framebuffer.cpp
+++ b/src/libcamera/mapped_framebuffer.cpp
@@ -238,6 +238,16 @@  MappedFrameBuffer::MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags)
 
 		planes_.emplace_back(info.address + plane.offset, plane.length);
 	}
+
+	buffer_ = buffer;
+}
+
+int MappedFrameBuffer::getPlaneFD(unsigned int plane)
+{
+	if (plane > buffer_->planes().size())
+		return -EINVAL;
+
+	return buffer_->planes()[plane].fd.get();
 }
 
 } /* namespace libcamera */