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color: export weston_CIExy_to_XYZ()

Browse source 
This will be needed by color-lcms.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2025-11-18 14:52:43 +02:00
parent 6a2ddee844
commit 6db55fe7e4
2 changed files with 8 additions and 5 deletions
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10
libweston/color.c
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@ -984,8 +984,8 @@ CIExy_to_z(struct weston_CIExy c)
return 1.0f - (c.x + c.y); return 1.0f - (c.x + c.y);
} }
static struct weston_vec3f WL_EXPORT struct weston_vec3f
CIExy_to_XYZ(struct weston_CIExy c) weston_CIExy_to_XYZ(struct weston_CIExy c)
{ {
return WESTON_VEC3F(c.x / c.y, 1.0f, CIExy_to_z(c) / c.y); return WESTON_VEC3F(c.x / c.y, 1.0f, CIExy_to_z(c) / c.y);
} }
@ -1024,7 +1024,7 @@ weston_normalized_primary_matrix_init(struct weston_mat3f *npm,
if (!weston_m3f_invert(&Pinv, P)) if (!weston_m3f_invert(&Pinv, P))
return false; return false;
struct weston_vec3f c = weston_m3f_mul_v3f(Pinv, CIExy_to_XYZ(w)); struct weston_vec3f c = weston_m3f_mul_v3f(Pinv, weston_CIExy_to_XYZ(w));
switch (dir) { switch (dir) {
case WESTON_NPM_FORWARD: case WESTON_NPM_FORWARD:
@ -1064,8 +1064,8 @@ weston_bradford_adaptation(struct weston_CIExy from, struct weston_CIExy to)
struct weston_mat3f tmp; struct weston_mat3f tmp;
weston_m3f_invert(&inv, bradford); weston_m3f_invert(&inv, bradford);
from_cr = weston_m3f_mul_v3f(bradford, CIExy_to_XYZ(from)); from_cr = weston_m3f_mul_v3f(bradford, weston_CIExy_to_XYZ(from));
to_cr = weston_m3f_mul_v3f(bradford, CIExy_to_XYZ(to)); to_cr = weston_m3f_mul_v3f(bradford, weston_CIExy_to_XYZ(to));
r = WESTON_VEC3F(to_cr.x / from_cr.x, r = WESTON_VEC3F(to_cr.x / from_cr.x,
to_cr.y / from_cr.y, to_cr.y / from_cr.y,
to_cr.z / from_cr.z); to_cr.z / from_cr.z);

3
libweston/color.h
View file

@ -756,4 +756,7 @@ weston_color_format_to_str(enum weston_color_format c);
char * char *
weston_color_format_mask_to_str(uint32_t color_format_mask); weston_color_format_mask_to_str(uint32_t color_format_mask);
struct weston_vec3f
weston_CIExy_to_XYZ(struct weston_CIExy c);
#endif /* WESTON_COLOR_H */ #endif /* WESTON_COLOR_H */