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| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2022-07-08 20:20:50 +0200 |
|---|---|---|
| committer | Sam Ravnborg <sam@ravnborg.org> | 2022-07-09 15:02:50 +0200 |
| commit | e5bd7e3e4a68f0befe53f59954b25eec9a792d60 (patch) | |
| tree | 4f8908bd38992564ef4fdaa20f394c28e988c42b /include/uapi/drm | |
| parent | 4c59b0805e9bf873fd3f5dca4fc53d8c220e39b4 (diff) | |
| download | linux-e5bd7e3e4a68f0befe53f59954b25eec9a792d60.tar.bz2 | |
drm/fourcc: Add DRM_FORMAT_C[124]
Introduce fourcc codes for color-indexed frame buffer formats with two,
four, and sixteen colors, and provide a mapping from bits per pixel and
depth to fourcc codes.
As the number of bits per pixel is less than eight, these rely on proper
block handling for the calculation of bits per pixel and pitch.
The fill order (the order in which multiple pixels are packed in a byte)
is the same order as used for indexed-color (2, 4, and 16 colors) images
in the PNG specification, Version 1.2.
This order is also the recommended and default order (FillOrder = 1) for
palette-color (16 colors) images in the TIFF 6.0 Specification, and is
also used for 16-color Linux frame buffer logos.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/3d88ca7ad32ff3ff3469c10f0b36c312ea233a33.1657294931.git.geert@linux-m68k.org
Diffstat (limited to 'include/uapi/drm')
| -rw-r--r-- | include/uapi/drm/drm_fourcc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index c1b4cfda7507..b9c746c3ebbc 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -99,6 +99,9 @@ extern "C" { #define DRM_FORMAT_INVALID 0 /* color index */ +#define DRM_FORMAT_C1 fourcc_code('C', '1', ' ', ' ') /* [7:0] C0:C1:C2:C3:C4:C5:C6:C7 1:1:1:1:1:1:1:1 eight pixels/byte */ +#define DRM_FORMAT_C2 fourcc_code('C', '2', ' ', ' ') /* [7:0] C0:C1:C2:C3 2:2:2:2 four pixels/byte */ +#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 bpp Red */ |