libcamera: Add support for RGB565 format

Add support for RGB565 format.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/formats.cpp

@@ -233,6 +233,16 @@ const PixelFormatInfo pixelFormatInfoInvalid{};
 
 const std::map<PixelFormat, PixelFormatInfo> pixelFormatInfo{
 	/* RGB formats. */
+	{ formats::RGB565, {
+		.name = "RGB565",
+		.format = formats::RGB565,
+		.v4l2Format = V4L2PixelFormat(V4L2_PIX_FMT_RGB565),
+		.bitsPerPixel = 16,
+		.colourEncoding = PixelFormatInfo::ColourEncodingRGB,
+		.packed = false,
+		.pixelsPerGroup = 1,
+		.planes = {{ { 3, 1 }, { 0, 0 }, { 0, 0 } }},
+	} },
 	{ formats::BGR888, {
 		.name = "BGR888",
 		.format = formats::BGR888,

src/libcamera/formats.yaml

@@ -8,6 +8,9 @@ formats:
   - R8:
       fourcc: DRM_FORMAT_R8
 
+  - RGB565:
+      fourcc: DRM_FORMAT_RGB565
+
   - RGB888:
       fourcc: DRM_FORMAT_RGB888
   - BGR888:

src/libcamera/v4l2_pixelformat.cpp

@@ -45,6 +45,7 @@ namespace {
 
 const std::map<V4L2PixelFormat, PixelFormat> vpf2pf{
 	/* RGB formats. */
+	{ V4L2PixelFormat(V4L2_PIX_FMT_RGB565), formats::RGB565 },
 	{ V4L2PixelFormat(V4L2_PIX_FMT_RGB24), formats::BGR888 },
 	{ V4L2PixelFormat(V4L2_PIX_FMT_BGR24), formats::RGB888 },
 	{ V4L2PixelFormat(V4L2_PIX_FMT_RGBA32), formats::ABGR8888 },