diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2025-03-28 15:15:01 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2025-04-01 15:35:22 +0200 |
| commit | a376dcf49c391d06dad31a87e3cdfdf67fecc98d (patch) | |
| tree | 6f139f71f4480b234c56e9a321d37f5256330f11 /drivers/gpu/drm/drm_format_internal.h | |
| parent | b39e5ba0ccb4014d94058eda21aec800c647863d (diff) | |
drm/format-helper: Add generic conversion to 8-bit formats
Add drm_fb_xfrm_line_32to8() to implement conversion from 32-bit
pixels to 8-bit pixels. The pixel-conversion is specified by the
given callback parameter. Mark the helper as always_inline to avoid
overhead from function calls.
Then implement all existing line-conversion functions with the new
generic call and the respective pixel-conversion helper.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250328141709.217283-6-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/drm_format_internal.h')
| -rw-r--r-- | drivers/gpu/drm/drm_format_internal.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_format_internal.h b/drivers/gpu/drm/drm_format_internal.h index 4f20b63cb6f6..9f857bfa368d 100644 --- a/drivers/gpu/drm/drm_format_internal.h +++ b/drivers/gpu/drm/drm_format_internal.h @@ -35,6 +35,23 @@ * Conversions from XRGB8888 */ +static inline u32 drm_pixel_xrgb8888_to_r8_bt601(u32 pix) +{ + u32 r = (pix & 0x00ff0000) >> 16; + u32 g = (pix & 0x0000ff00) >> 8; + u32 b = pix & 0x000000ff; + + /* ITU-R BT.601: Y = 0.299 R + 0.587 G + 0.114 B */ + return (3 * r + 6 * g + b) / 10; +} + +static inline u32 drm_pixel_xrgb8888_to_rgb332(u32 pix) +{ + return ((pix & 0x00e00000) >> 16) | + ((pix & 0x0000e000) >> 11) | + ((pix & 0x000000c0) >> 6); +} + static inline u32 drm_pixel_xrgb8888_to_rgb565(u32 pix) { return ((pix & 0x00f80000) >> 8) | |