| Message ID | 585dc03acb4016bba910e7d15fec3ef4f0aec5b0.1646683502.git.geert@linux-m68k.org |
|---|---|
| State | New |
| Headers | show |
| Series | drm: Add support for low-color frame buffer formats | expand |
On 3/7/22 21:52, Geert Uytterhoeven wrote: > Traditionally, the first channel has been called the "red" channel, but > the fourcc values for single-channel "red" formats can also be used for > other light-on-dark displays, like grayscale. > > Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> > --- Yes, I learned that "Red" actually meant just a color channel that may not be red in one of the thread about fourcc formats. So I agree that would be good to have a comment about this. Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index 457ed39cc48f08e1..f0187cf20e4619d2 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -104,16 +104,16 @@ extern "C" { #define DRM_FORMAT_C4 fourcc_code('C', '4', ' ', ' ') /* [7:0] C0:C1 4:4 two pixels/byte */ #define DRM_FORMAT_C8 fourcc_code('C', '8', ' ', ' ') /* [7:0] C 8 one pixel/byte */ -/* 8 bpp Red */ +/* 8 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R8 fourcc_code('R', '8', ' ', ' ') /* [7:0] R */ -/* 10 bpp Red */ +/* 10 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R10 fourcc_code('R', '1', '0', ' ') /* [15:0] x:R 6:10 little endian */ -/* 12 bpp Red */ +/* 12 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R12 fourcc_code('R', '1', '2', ' ') /* [15:0] x:R 4:12 little endian */ -/* 16 bpp Red */ +/* 16 bpp Red (or generic light-on-dark) */ #define DRM_FORMAT_R16 fourcc_code('R', '1', '6', ' ') /* [15:0] R little endian */ /* 16 bpp RG */
Traditionally, the first channel has been called the "red" channel, but the fourcc values for single-channel "red" formats can also be used for other light-on-dark displays, like grayscale. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> --- RFC, as I have no immediate need for these formats. v2: - New. --- include/uapi/drm/drm_fourcc.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)