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video: pixel_format: Add compare helpers

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Add helpers that compare two pixel-format descriptions against
each other.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250714151513.309475-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-07-14 17:13:01 +02:00
parent cbdd16b818
commit cff5fb8273
1 changed files with 58 additions and 0 deletions
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58
include/video/pixel_format.h
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@ -38,4 +38,62 @@ struct pixel_format {
#define PIXEL_FORMAT_XRGB2101010 \
{ 32, false, { .alpha = {0, 0}, .red = {20, 10}, .green = {10, 10}, .blue = {0, 10} } }
#define __pixel_format_cmp_field(lhs, rhs, name) \
{ \
int ret = ((lhs)->name) - ((rhs)->name); \
if (ret) \
return ret; \
}
#define __pixel_format_cmp_bitfield(lhs, rhs, name) \
{ \
__pixel_format_cmp_field(lhs, rhs, name.offset); \
__pixel_format_cmp_field(lhs, rhs, name.length); \
}
/**
* pixel_format_cmp - Compares two pixel-format descriptions
*
* @lhs: a pixel-format description
* @rhs: a pixel-format description
*
* Compares two pixel-format descriptions for their order. The semantics
* are equivalent to memcmp().
*
* Returns:
* 0 if both arguments describe the same pixel format, less-than-zero if lhs < rhs,
* or greater-than-zero if lhs > rhs.
*/
static inline int pixel_format_cmp(const struct pixel_format *lhs, const struct pixel_format *rhs)
{
__pixel_format_cmp_field(lhs, rhs, bits_per_pixel);
__pixel_format_cmp_field(lhs, rhs, indexed);
if (lhs->indexed) {
__pixel_format_cmp_bitfield(lhs, rhs, index);
} else {
__pixel_format_cmp_bitfield(lhs, rhs, alpha);
__pixel_format_cmp_bitfield(lhs, rhs, red);
__pixel_format_cmp_bitfield(lhs, rhs, green);
__pixel_format_cmp_bitfield(lhs, rhs, blue);
}
return 0;
}
/**
* pixel_format_equal - Compares two pixel-format descriptions for equality
*
* @lhs: a pixel-format description
* @rhs: a pixel-format description
*
* Returns:
* True if both arguments describe the same pixel format, or false otherwise.
*/
static inline bool pixel_format_equal(const struct pixel_format *lhs,
const struct pixel_format *rhs)
{
return !pixel_format_cmp(lhs, rhs);
}
#endif