android: camera_buffer: Implement libcamera::Extensible

In order to prepare to support more memory backends, make the
CameraBuffer class implement the PIMPL (pointer-to-implementation)
pattern by inheriting from the libcamera::Extensible class.

Temporary maintain libcamera::MappedBuffer as the CameraBuffer base
class to maintain compatibility of the CameraStream::process() interface
that requires a MappedBuffer * as second argument and will be converted
to use a CameraBuffer in the next patch.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/android/camera_buffer.h b/src/android/camera_buffer.h
index 0590cd84..ca4f4527 100644
--- a/src/android/camera_buffer.h
+++ b/src/android/camera_buffer.h
@@ -9,13 +9,25 @@
 
 #include <hardware/camera3.h>
 
+#include <libcamera/class.h>
 #include <libcamera/internal/buffer.h>
+#include <libcamera/span.h>
 
-class CameraBuffer : public libcamera::MappedBuffer
+class CameraBuffer final : public libcamera::Extensible,
+			   public libcamera::MappedBuffer
 {
+	LIBCAMERA_DECLARE_PRIVATE(CameraBuffer)
+
 public:
 	CameraBuffer(buffer_handle_t camera3Buffer, int flags);
 	~CameraBuffer();
+
+	bool isValid() const;
+
+	unsigned int numPlanes() const;
+
+	libcamera::Span<const uint8_t> plane(unsigned int plane) const;
+	libcamera::Span<uint8_t> plane(unsigned int plane);
 };
 
 #endif /* __ANDROID_CAMERA_BUFFER_H__ */