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render/color: move inverse EOTF eval helper to private header

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This will be used by the DRM backend in the next commit.
This commit is contained in:
Simon Ser 2025-06-21 12:50:46 +02:00
parent 0d24cdb822
commit f9a27c5b6f
2 changed files with 7 additions and 2 deletions
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5
include/render/color.h
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@ -97,4 +97,9 @@ void wlr_color_primaries_to_xyz(const struct wlr_color_primaries *primaries, flo
void wlr_color_transfer_function_get_default_luminance(enum wlr_color_transfer_function tf, void wlr_color_transfer_function_get_default_luminance(enum wlr_color_transfer_function tf,
struct wlr_color_luminances *lum); struct wlr_color_luminances *lum);
/**
* Apply a color transfer function's EOTF⁻¹ operation.
*/
float wlr_color_transfer_function_eval_inverse_eotf(enum wlr_color_transfer_function tf, float x);
#endif #endif

4
render/color.c
View file

@ -177,7 +177,7 @@ static float bt1886_eval_inverse_eotf(float x) {
return powf(x / a, 1.0 / 2.4) - b; return powf(x / a, 1.0 / 2.4) - b;
} }
static float transfer_function_eval_inverse_eotf( float wlr_color_transfer_function_eval_inverse_eotf(
enum wlr_color_transfer_function tf, float x) { enum wlr_color_transfer_function tf, float x) {
switch (tf) { switch (tf) {
case WLR_COLOR_TRANSFER_FUNCTION_SRGB: case WLR_COLOR_TRANSFER_FUNCTION_SRGB:
@ -198,7 +198,7 @@ static void color_transform_inverse_eotf_eval(
struct wlr_color_transform_inverse_eotf *tr, struct wlr_color_transform_inverse_eotf *tr,
float out[static 3], const float in[static 3]) { float out[static 3], const float in[static 3]) {
for (size_t i = 0; i < 3; i++) { for (size_t i = 0; i < 3; i++) {
out[i] = transfer_function_eval_inverse_eotf(tr->tf, in[i]); out[i] = wlr_color_transfer_function_eval_inverse_eotf(tr->tf, in[i]);
} }
} }