On Thu May 21 00:44:09 2026 +0200, Sven Püschel wrote:
> Add a has_alpha value to the v4l2_format_info struct to indicate if the
> format contains an alpha component. This information can currently not
> be queried in a generic way, but might be useful for potential drivers
> to properly setup alpha blending to copy or set the alpha value.
> The implementation is based on the drm_format_info implementation.
>
> Reviewed-by: Nicolas Dufresne <[email protected]>
> Signed-off-by: Sven Püschel <[email protected]>
> Signed-off-by: Nicolas Dufresne <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/v4l2-core/v4l2-common.c | 32 ++++++++++++++++----------------
include/media/v4l2-common.h | 2 ++
2 files changed, 18 insertions(+), 16 deletions(-)
---
diff --git a/drivers/media/v4l2-core/v4l2-common.c
b/drivers/media/v4l2-core/v4l2-common.c
index b55ab72958ea..3cc8b04e1ea6 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -248,26 +248,26 @@ const struct v4l2_format_info *v4l2_format_info(u32
format)
/* RGB formats (1 or 2 bytes per pixel) */
{ .format = V4L2_PIX_FMT_RGB332, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ARGB444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ARGB444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_XRGB444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_RGBA444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_RGBA444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_RGBX444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ABGR444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ABGR444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_XBGR444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_BGRA444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_BGRA444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_BGRX444, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ARGB555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ARGB555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_XRGB555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_RGBA555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_RGBA555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_RGBX555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ABGR555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ABGR555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_XBGR555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_BGRA555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_BGRA555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_BGRX555, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB565, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB555X, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ARGB555X, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ARGB555X, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_XRGB555X, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB565X, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
@@ -276,24 +276,24 @@ const struct v4l2_format_info *v4l2_format_info(u32
format)
{ .format = V4L2_PIX_FMT_BGR24, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 3, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB24, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 3, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_BGR32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ABGR32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ABGR32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_XBGR32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_BGRA32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_BGRA32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_BGRX32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_RGBA32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_RGBA32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_RGBX32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ARGB32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ARGB32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
{ .format = V4L2_PIX_FMT_XRGB32, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGBX1010102, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_RGBA1010102, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ARGB2101010, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_RGBA1010102, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
+ { .format = V4L2_PIX_FMT_ARGB2101010, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
/* RGB formats (6 or 8 bytes per pixel) */
{ .format = V4L2_PIX_FMT_BGR48_12, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 6, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_BGR48, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 6, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_RGB48, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 6, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
- { .format = V4L2_PIX_FMT_ABGR64_12, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 8, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
+ { .format = V4L2_PIX_FMT_ABGR64_12, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 8, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1, .has_alpha = true },
/* HSV formats */
{ .format = V4L2_PIX_FMT_HSV24, .pixel_enc =
V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 3, 0, 0, 0 },
.bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 },
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index f8b1faced79c..401d8506c24b 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -520,6 +520,7 @@ enum v4l2_pixel_encoding {
* @vdiv: Vertical chroma subsampling factor
* @block_w: Per-plane macroblock pixel width (optional)
* @block_h: Per-plane macroblock pixel height (optional)
+ * @has_alpha: Does the format embeds an alpha component?
*/
struct v4l2_format_info {
u32 format;
@@ -532,6 +533,7 @@ struct v4l2_format_info {
u8 vdiv;
u8 block_w[4];
u8 block_h[4];
+ bool has_alpha;
};
static inline bool v4l2_is_format_rgb(const struct v4l2_format_info *f)
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