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drm/vkms: Document pixel_argb_u16

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The meaning of each member of the structure was not specified. To clarify
the format used and the reason behind those choices, add some
documentation.

Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Link: https://lore.kernel.org/r/20250415-yuv-v18-1-f2918f71ec4b@bootlin.com
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
This commit is contained in:
Louis Chauvet
2025-04-15 15:55:32 +02:00
parent 6c8e8a1c43
commit c76e2c78bc
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/vkms/vkms_drv.h
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@@ -45,6 +45,23 @@ struct vkms_frame_info {
unsigned int rotation;
};
/**
* struct pixel_argb_u16 - Internal representation of a pixel color.
* @a: Alpha component value, stored in 16 bits, without padding, using
* machine endianness
* @r: Red component value, stored in 16 bits, without padding, using
* machine endianness
* @g: Green component value, stored in 16 bits, without padding, using
* machine endianness
* @b: Blue component value, stored in 16 bits, without padding, using
* machine endianness
*
* The goal of this structure is to keep enough precision to ensure
* correct composition results in VKMS and simplifying color
* manipulation by splitting each component into its own field.
* Caution: the byte ordering of this structure is machine-dependent,
* you can't cast it directly to AR48 or xR48.
*/
struct pixel_argb_u16 {
u16 a, r, g, b;
};