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3665b53e29
Converting the LCMS2 transform to a 3D LUT early causes issues: - It's a lossy process, the consumer will not be able to pick a 3D LUT size on their own. - It requires unnecessary conversions and allocations: an intermediate 3D LUT is allocated, but the renderer already allocates one. - It makes it harder to support arbitrary color transforms in the renderer, because each type needs to be handled differently. Instead, expose a function to evaluate a color transform, and use that to build the 3D LUT in the renderer.
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
#include <assert.h>
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#include <lcms2.h>
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#include <stdlib.h>
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#include <wlr/util/log.h>
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#include <wlr/render/color.h>
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#include "render/color.h"
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struct wlr_color_transform_lcms2 {
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struct wlr_color_transform base;
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cmsContext ctx;
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cmsHTRANSFORM lcms;
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};
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static const cmsCIExyY srgb_whitepoint = { 0.3127, 0.3291, 1 };
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static const cmsCIExyYTRIPLE srgb_primaries = {
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.Red = { 0.64, 0.33, 1 },
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.Green = { 0.3, 0.6, 1 },
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.Blue = { 0.15, 0.06, 1},
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};
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static void handle_lcms_error(cmsContext ctx, cmsUInt32Number code, const char *text) {
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wlr_log(WLR_ERROR, "[lcms] %s", text);
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}
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struct wlr_color_transform *wlr_color_transform_init_linear_to_icc(
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const void *data, size_t size) {
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struct wlr_color_transform_lcms2 *tx = NULL;
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cmsContext ctx = cmsCreateContext(NULL, NULL);
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if (ctx == NULL) {
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wlr_log(WLR_ERROR, "cmsCreateContext failed");
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return NULL;
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}
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cmsSetLogErrorHandlerTHR(ctx, handle_lcms_error);
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cmsHPROFILE icc_profile = cmsOpenProfileFromMemTHR(ctx, data, size);
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if (icc_profile == NULL) {
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wlr_log(WLR_ERROR, "cmsOpenProfileFromMemTHR failed");
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goto error_ctx;
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}
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if (cmsGetDeviceClass(icc_profile) != cmsSigDisplayClass) {
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wlr_log(WLR_ERROR, "ICC profile must have the Display device class");
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goto error_icc_profile;
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}
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cmsToneCurve *linear_tone_curve = cmsBuildGamma(ctx, 1);
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if (linear_tone_curve == NULL) {
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wlr_log(WLR_ERROR, "cmsBuildGamma failed");
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goto error_icc_profile;
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}
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cmsToneCurve *linear_tf[] = {
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linear_tone_curve,
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linear_tone_curve,
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linear_tone_curve,
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};
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cmsHPROFILE srgb_profile = cmsCreateRGBProfileTHR(ctx, &srgb_whitepoint,
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&srgb_primaries, linear_tf);
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cmsFreeToneCurve(linear_tone_curve);
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if (srgb_profile == NULL) {
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wlr_log(WLR_ERROR, "cmsCreateRGBProfileTHR failed");
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goto error_icc_profile;
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}
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cmsHTRANSFORM lcms_tr = cmsCreateTransformTHR(ctx,
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srgb_profile, TYPE_RGB_FLT, icc_profile, TYPE_RGB_FLT,
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INTENT_RELATIVE_COLORIMETRIC, 0);
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cmsCloseProfile(srgb_profile);
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cmsCloseProfile(icc_profile);
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if (lcms_tr == NULL) {
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wlr_log(WLR_ERROR, "cmsCreateTransformTHR failed");
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goto error_ctx;
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}
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tx = calloc(1, sizeof(*tx));
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if (!tx) {
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cmsDeleteTransform(lcms_tr);
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goto error_ctx;
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}
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wlr_color_transform_init(&tx->base, COLOR_TRANSFORM_LCMS2);
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tx->ctx = ctx;
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tx->lcms = lcms_tr;
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return &tx->base;
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error_icc_profile:
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cmsCloseProfile(icc_profile);
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error_ctx:
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cmsDeleteContext(ctx);
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return NULL;
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}
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void color_transform_lcms2_finish(struct wlr_color_transform_lcms2 *tr) {
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cmsDeleteTransform(tr->lcms);
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cmsDeleteContext(tr->ctx);
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}
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struct wlr_color_transform_lcms2 *color_transform_lcms2_from_base(
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struct wlr_color_transform *tr) {
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assert(tr->type == COLOR_TRANSFORM_LCMS2);
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struct wlr_color_transform_lcms2 *lcms2 = wl_container_of(tr, lcms2, base);
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return lcms2;
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}
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void color_transform_lcms2_eval(struct wlr_color_transform_lcms2 *tr,
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float out[static 3], const float in[static 3]) {
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cmsDoTransform(tr->lcms, in, out, 1);
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}
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