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drm/format-helper: Normalize BT.601 factors to 256

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BT.601 weights RGB components by certain factors to convert the
color to grayscale. Normalize the constants to 256 instead of 10.
Allows for slightly more precise rounding. The division by 256 can
be compiled as an 8-bit shift, which might be faster on some hardware.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250603161158.423962-1-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-06-03 18:11:50 +02:00
parent e2944dc658
commit a979a54165
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_format_internal.h
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@ -42,7 +42,7 @@ static inline u32 drm_pixel_xrgb8888_to_r8_bt601(u32 pix)
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;
return (77 * r + 150 * g + 29 * b) / 256;
}
static inline u32 drm_pixel_xrgb8888_to_rgb332(u32 pix)