Introduce fourcc codes for color-indexed frame buffer formats with two, four, and sixteen colors. 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@xxxxxxxxxxxxxx> --- Marked RFC, as this patch should be replaced by a proper sync with Linux' include/drm/drm_fourcc.h, once accepted. https://gitlab.freedesktop.org/mesa/drm/-/blob/main/include/drm/README section "When and how to update these files". v2: - Split off changes to include/drm/drm_fourcc.h, - Improve description. --- include/drm/drm_fourcc.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h index c668ffb877f1b777..789c7a180cf559af 100644 --- a/include/drm/drm_fourcc.h +++ b/include/drm/drm_fourcc.h @@ -99,7 +99,10 @@ extern "C" { #define DRM_FORMAT_INVALID 0 /* color index */ -#define DRM_FORMAT_C8 fourcc_code('C', '8', ' ', ' ') /* [7:0] C */ +#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 one pixel/byte */ /* 8 bpp Red */ #define DRM_FORMAT_R8 fourcc_code('R', '8', ' ', ' ') /* [7:0] R */ -- 2.25.1
