weston/tests/lcms-util-test.c

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/*
* Copyright 2022 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <math.h>
#include <lcms2.h>
#include "weston-test-client-helper.h"
#include "color_util.h"
#include "lcms_util.h"
static void
compare_pipeline_to_transfer_fn(cmsPipeline *pipeline, enum transfer_fn fn,
struct scalar_stat *stat)
{
const unsigned N = 100000;
unsigned i;
for (i = 0; i < N; i++) {
float x = (double)i / N;
float ref = apply_tone_curve(fn, x);
float y;
cmsPipelineEvalFloat(&x, &y, pipeline);
scalar_stat_update(stat, y - ref, &(struct color_float){ .r = x });
}
}
static const enum transfer_fn build_MPE_curves_test_set[] = {
TRANSFER_FN_SRGB_EOTF,
TRANSFER_FN_SRGB_EOTF_INVERSE,
TRANSFER_FN_ADOBE_RGB_EOTF,
TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE,
TRANSFER_FN_POWER2_4_EOTF,
TRANSFER_FN_POWER2_4_EOTF_INVERSE,
};
TEST_P(build_MPE_curves, build_MPE_curves_test_set)
{
const enum transfer_fn *fn = data;
const cmsContext ctx = 0;
cmsToneCurve *curve;
cmsStage *stage;
cmsPipeline *pipeline;
struct scalar_stat stat = {};
curve = build_MPE_curve(ctx, *fn);
stage = cmsStageAllocToneCurves(ctx, 1, &curve);
cmsFreeToneCurve(curve);
pipeline = cmsPipelineAlloc(ctx, 1, 1);
cmsPipelineInsertStage(pipeline, cmsAT_END, stage);
compare_pipeline_to_transfer_fn(pipeline, *fn, &stat);
testlog("Transfer function %s as a segmented curve element, error:\n",
transfer_fn_name(*fn));
scalar_stat_print_float(&stat);
assert(fabs(stat.max) < 1e-7);
assert(fabs(stat.min) < 1e-7);
cmsPipelineFree(pipeline);
}