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drm/format-helper: Add generic conversion to 8-bit formats

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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
This commit is contained in:
Thomas Zimmermann
2025-03-28 15:15:01 +01:00
parent b39e5ba0cc
commit a376dcf49c
2 changed files with 31 additions and 24 deletions
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17
drivers/gpu/drm/drm_format_internal.h
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@@ -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) |