drm/color-mgmt: Prepare for RGB332 palettes

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Add helper drm_crtc_fill_palette_332(), which fills palettes with
RGB332 color data. Each color in RGB332 format serves as an index
into an 8-bit palette that stores the corresponding component-based
colors.

Vesadrm will use the new helper to emulate RGB formats on top of
framebuffers in C8 format.

v2:
- add comments on bit operations (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250714151513.309475-6-tzimmermann@suse.de

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Thomas Zimmermann 2025-07-14 17:13:05 +02:00

parent 061963cd9e

commit 7ff61177b7

2 changed files with 35 additions and 0 deletions

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34

drivers/gpu/drm/drm_color_mgmt.c

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1

include/drm/drm_color_mgmt.h

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