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render/color: introduce COLOR_TRANSFORM_LUT_3X1D

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This will be useful to apply LUTs applied via wlr_gamma_control_v1,
and to add wlr_color_transform support to wlr_output.
This commit is contained in:
Simon Ser 2025-05-24 11:19:32 +02:00 • committed by Kenny Levinsen
parent 3665b53e29
commit 74217a4d93
4 changed files with 116 additions and 5 deletions
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57
render/color.c
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@ -38,6 +38,28 @@ struct wlr_color_transform *wlr_color_transform_init_srgb(void) {
return tx;
}
struct wlr_color_transform *wlr_color_transform_init_lut_3x1d(size_t dim,
const uint16_t *r, const uint16_t *g, const uint16_t *b) {
uint16_t *lut_3x1d = malloc(3 * dim * sizeof(lut_3x1d[0]));
if (lut_3x1d == NULL) {
return NULL;
}
memcpy(&lut_3x1d[0 * dim], r, dim * sizeof(lut_3x1d[0]));
memcpy(&lut_3x1d[1 * dim], g, dim * sizeof(lut_3x1d[0]));
memcpy(&lut_3x1d[2 * dim], b, dim * sizeof(lut_3x1d[0]));
struct wlr_color_transform_lut_3x1d *tx = calloc(1, sizeof(*tx));
if (!tx) {
free(lut_3x1d);
return NULL;
}
wlr_color_transform_init(&tx->base, COLOR_TRANSFORM_LUT_3X1D);
tx->lut_3x1d = lut_3x1d;
tx->dim = dim;
return &tx->base;
}
static void color_transform_destroy(struct wlr_color_transform *tr) {
switch (tr->type) {
case COLOR_TRANSFORM_SRGB:
@ -45,6 +67,10 @@ static void color_transform_destroy(struct wlr_color_transform *tr) {
case COLOR_TRANSFORM_LCMS2:
color_transform_lcms2_finish(color_transform_lcms2_from_base(tr));
break;
case COLOR_TRANSFORM_LUT_3X1D:;
struct wlr_color_transform_lut_3x1d *lut_3x1d = color_transform_lut_3x1d_from_base(tr);
free(lut_3x1d->lut_3x1d);
break;
}
wlr_addon_set_finish(&tr->addons);
free(tr);
@ -66,6 +92,37 @@ void wlr_color_transform_unref(struct wlr_color_transform *tr) {
}
}
struct wlr_color_transform_lut_3x1d *color_transform_lut_3x1d_from_base(
struct wlr_color_transform *tr) {
assert(tr->type == COLOR_TRANSFORM_LUT_3X1D);
struct wlr_color_transform_lut_3x1d *lut_3x1d = wl_container_of(tr, lut_3x1d, base);
return lut_3x1d;
}
static float lut_1d_get(const uint16_t *lut, size_t len, size_t i) {
if (i > len) {
i = len - 1;
}
return (float) lut[i] / UINT16_MAX;
}
static float lut_1d_eval(const uint16_t *lut, size_t len, float x) {
double pos = x * (len - 1);
double int_part;
double frac_part = modf(pos, &int_part);
size_t i = (size_t) int_part;
double a = lut_1d_get(lut, len, i);
double b = lut_1d_get(lut, len, i + 1);
return a * (1 - frac_part) + b * frac_part;
}
void color_transform_lut_3x1d_eval(struct wlr_color_transform_lut_3x1d *tr,
float out[static 3], const float in[static 3]) {
for (size_t i = 0; i < 3; i++) {
out[i] = lut_1d_eval(&tr->lut_3x1d[tr->dim * i], tr->dim, in[i]);
}
}
void wlr_color_primaries_from_named(struct wlr_color_primaries *out,
enum wlr_color_named_primaries named) {
switch (named) {