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render: make wlr_render_pass_add_texture() take a general color_transform

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Mirrors the previous changes to wlr_renderer_begin_buffer_pass(), moving
color-management decisions to wlr_scene
This commit is contained in:
Félix Poisot 2026-01-31 21:30:55 +00:00
parent 42cf99a037
commit 03d3041fba
7 changed files with 148 additions and 54 deletions
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81
types/scene/wlr_scene.c
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@ -20,6 +20,7 @@
#include "types/wlr_scene.h"
#include "util/array.h"
#include "util/env.h"
#include "util/matrix.h"
#include "util/time.h"
#include <wlr/config.h>
@ -1411,6 +1412,63 @@ static float get_luminance_multiplier(const struct wlr_color_luminances *src_lum
return (dst_lum->reference / src_lum->reference) * (src_lum->max / dst_lum->max);
}
static struct wlr_color_transform *scene_texture_to_blend_space(
struct wlr_scene_buffer *source, enum wlr_color_named_primaries dest_primaries,
const struct wlr_color_luminances *dest_luminance) {
struct wlr_color_transform *color_matrix = NULL;
struct wlr_color_transform *eotf = NULL;
struct wlr_color_transform *combined = NULL;
enum wlr_color_transfer_function source_tf = WLR_COLOR_TRANSFER_FUNCTION_GAMMA22;
if (source->transfer_function != 0) {
source_tf = source->transfer_function;
}
eotf = wlr_color_transform_init_eotf_to_linear(source_tf);
if (eotf == NULL) {
goto cleanup_transforms;
}
struct wlr_color_luminances source_lum;
wlr_color_transfer_function_get_default_luminance(source_tf, &source_lum);
float luminance_multiplier = get_luminance_multiplier(&source_lum, dest_luminance);
float matrix[9];
enum wlr_color_named_primaries source_primaries = WLR_COLOR_NAMED_PRIMARIES_SRGB;
if (source->primaries != 0) {
source_primaries = source->primaries;
}
if (source_primaries != dest_primaries) {
struct wlr_color_primaries primaries;
wlr_color_primaries_from_named(&primaries, source_primaries);
struct wlr_color_primaries primaries_blend;
wlr_color_primaries_from_named(&primaries_blend, dest_primaries);
wlr_color_primaries_transform_absolute_colorimetric(&primaries, &primaries_blend, matrix);
} else {
wlr_matrix_identity(matrix);
}
for (int i = 0; i < 9; ++i) {
matrix[i] *= luminance_multiplier;
}
color_matrix = wlr_color_transform_init_matrix(matrix);
if (color_matrix == NULL) {
goto cleanup_transforms;
}
struct wlr_color_transform *transforms[] = {
eotf,
color_matrix,
};
const size_t transforms_len = sizeof(transforms) / sizeof(transforms[0]);
color_transform_compose(&combined, transforms, transforms_len);
cleanup_transforms:
wlr_color_transform_unref(eotf);
wlr_color_transform_unref(color_matrix);
return combined;
}
static void scene_entry_render(struct render_list_entry *entry, const struct render_data *data) {
struct wlr_scene_node *node = entry->node;
@ -1489,17 +1547,14 @@ static void scene_entry_render(struct render_list_entry *entry, const struct ren
wlr_output_transform_invert(scene_buffer->transform);
transform = wlr_output_transform_compose(transform, data->transform);
struct wlr_color_primaries primaries = {0};
if (scene_buffer->primaries != 0) {
wlr_color_primaries_from_named(&primaries, scene_buffer->primaries);
}
struct wlr_color_transform *source_to_blend = NULL;
if (data->output->output->renderer->features.input_color_transform) {
struct wlr_color_luminances srgb_lum;
wlr_color_transfer_function_get_default_luminance(WLR_COLOR_TRANSFER_FUNCTION_SRGB, &srgb_lum);
struct wlr_color_luminances src_lum, srgb_lum;
wlr_color_transfer_function_get_default_luminance(
scene_buffer->transfer_function, &src_lum);
wlr_color_transfer_function_get_default_luminance(
WLR_COLOR_TRANSFER_FUNCTION_SRGB, &srgb_lum);
float luminance_multiplier = get_luminance_multiplier(&src_lum, &srgb_lum);
source_to_blend = scene_texture_to_blend_space(
scene_buffer, WLR_COLOR_NAMED_PRIMARIES_SRGB, &srgb_lum);
}
wlr_render_pass_add_texture(data->render_pass, &(struct wlr_render_texture_options) {
.texture = texture,
@ -1512,15 +1567,15 @@ static void scene_entry_render(struct render_list_entry *entry, const struct ren
.blend_mode = !data->output->scene->calculate_visibility ||
!pixman_region32_empty(&opaque) ?
WLR_RENDER_BLEND_MODE_PREMULTIPLIED : WLR_RENDER_BLEND_MODE_NONE,
.transfer_function = scene_buffer->transfer_function,
.primaries = scene_buffer->primaries != 0 ? &primaries : NULL,
.color_transform = source_to_blend,
.color_encoding = scene_buffer->color_encoding,
.color_range = scene_buffer->color_range,
.luminance_multiplier = &luminance_multiplier,
.wait_timeline = scene_buffer->wait_timeline,
.wait_point = scene_buffer->wait_point,
});
wlr_color_transform_unref(source_to_blend);
struct wlr_scene_output_sample_event sample_event = {
.output = data->output,
.direct_scanout = false,