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backend/drm: add support for CTM

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This commit is contained in:
Simon Ser 2025-11-13 14:31:14 +01:00
parent 92ba6ffdf8
commit 2db00a9872
8 changed files with 96 additions and 12 deletions
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44
backend/drm/color.c
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@ -3,6 +3,12 @@
#include "backend/drm/color.h"
#include "backend/drm/drm.h"
#include "render/color.h"
#include "util/matrix.h"
enum wlr_drm_crtc_color_transform_stage {
WLR_DRM_CRTC_COLOR_TRANSFORM_MATRIX,
WLR_DRM_CRTC_COLOR_TRANSFORM_LUT_3X1D,
};
static struct wlr_color_transform_lut_3x1d *create_identity_3x1dlut(size_t dim) {
if (dim == 0) {
@ -21,8 +27,21 @@ static struct wlr_color_transform_lut_3x1d *create_identity_3x1dlut(size_t dim)
return color_transform_lut_3x1d_from_base(out);
}
static bool set_stage(enum wlr_drm_crtc_color_transform_stage *current,
enum wlr_drm_crtc_color_transform_stage next) {
// Enforce that we fill the pipeline in order: first CTM then GAMMA_LUT
if (*current > next) {
return false;
}
*current = next;
return true;
}
static bool drm_crtc_color_transform_init_lut_3x1d(struct wlr_drm_crtc_color_transform *out,
size_t dim) {
enum wlr_drm_crtc_color_transform_stage *stage, size_t dim) {
if (!set_stage(stage, WLR_DRM_CRTC_COLOR_TRANSFORM_LUT_3X1D)) {
return false;
}
if (out->lut_3x1d != NULL) {
return true;
}
@ -31,13 +50,14 @@ static bool drm_crtc_color_transform_init_lut_3x1d(struct wlr_drm_crtc_color_tra
}
static bool drm_crtc_color_transform_convert(struct wlr_drm_crtc_color_transform *out,
struct wlr_color_transform *in, size_t lut_3x1d_dim) {
struct wlr_color_transform *in, enum wlr_drm_crtc_color_transform_stage *stage,
size_t lut_3x1d_dim) {
switch (in->type) {
case COLOR_TRANSFORM_INVERSE_EOTF:;
struct wlr_color_transform_inverse_eotf *inv_eotf =
wlr_color_transform_inverse_eotf_from_base(in);
if (!drm_crtc_color_transform_init_lut_3x1d(out, lut_3x1d_dim)) {
if (!drm_crtc_color_transform_init_lut_3x1d(out, stage, lut_3x1d_dim)) {
return false;
}
@ -58,7 +78,7 @@ static bool drm_crtc_color_transform_convert(struct wlr_drm_crtc_color_transform
return false;
}
if (!drm_crtc_color_transform_init_lut_3x1d(out, lut_3x1d_dim)) {
if (!drm_crtc_color_transform_init_lut_3x1d(out, stage, lut_3x1d_dim)) {
return false;
}
@ -68,15 +88,21 @@ static bool drm_crtc_color_transform_convert(struct wlr_drm_crtc_color_transform
}
return true;
case COLOR_TRANSFORM_MATRIX:
return false; // TODO: add support for CTM
case COLOR_TRANSFORM_MATRIX:;
struct wlr_color_transform_matrix *matrix = wl_container_of(in, matrix, base);
if (!set_stage(stage, WLR_DRM_CRTC_COLOR_TRANSFORM_MATRIX)) {
return false;
}
wlr_matrix_multiply(out->matrix, matrix->matrix, out->matrix);
out->has_matrix = true;
return true;
case COLOR_TRANSFORM_LCMS2:
return false; // unsupported
case COLOR_TRANSFORM_PIPELINE:;
struct wlr_color_transform_pipeline *pipeline = wl_container_of(in, pipeline, base);
for (size_t i = 0; i < pipeline->len; i++) {
if (!drm_crtc_color_transform_convert(out, pipeline->transforms[i], lut_3x1d_dim)) {
if (!drm_crtc_color_transform_convert(out, pipeline->transforms[i], stage, lut_3x1d_dim)) {
return false;
}
}
@ -109,9 +135,11 @@ static struct wlr_drm_crtc_color_transform *drm_crtc_color_transform_create(
tr->base = base;
wlr_addon_init(&tr->addon, &base->addons, crtc, &addon_impl);
wlr_matrix_identity(tr->matrix);
size_t lut_3x1d_dim = drm_crtc_get_gamma_lut_size(backend, crtc);
tr->failed = !drm_crtc_color_transform_convert(tr, base, lut_3x1d_dim);
enum wlr_drm_crtc_color_transform_stage stage = WLR_DRM_CRTC_COLOR_TRANSFORM_MATRIX;
tr->failed = !drm_crtc_color_transform_convert(tr, base, &stage, lut_3x1d_dim);
return tr;
}