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https://gitlab.freedesktop.org/wayland/weston
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44c3079567
This adds a new test helper library that depends on LittleCMS 2. For starters, the library implements conversion from enum transfer_fn to ICC multiProcessingElements compatible LittleCMS curve object. That conversion allows encoding transfer funtions in ICC files and LittleCMS pipelines with full float32 precision instead of forcing a conversion to a 1D LUT which for power-type curves is surprisingly imprecise. This also adds CI tests to make sure the conversion matches our hand-coded transfer functions. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
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* Copyright 2022 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "config.h"
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#include <math.h>
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#include <lcms2.h>
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#include "weston-test-client-helper.h"
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#include "color_util.h"
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#include "lcms_util.h"
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static void
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compare_pipeline_to_transfer_fn(cmsPipeline *pipeline, enum transfer_fn fn,
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struct scalar_stat *stat)
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{
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const unsigned N = 100000;
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unsigned i;
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for (i = 0; i < N; i++) {
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float x = (double)i / N;
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float ref = apply_tone_curve(fn, x);
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float y;
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cmsPipelineEvalFloat(&x, &y, pipeline);
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scalar_stat_update(stat, y - ref, &(struct color_float){ .r = x });
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}
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}
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static const enum transfer_fn build_MPE_curves_test_set[] = {
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TRANSFER_FN_SRGB_EOTF,
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TRANSFER_FN_SRGB_EOTF_INVERSE,
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TRANSFER_FN_ADOBE_RGB_EOTF,
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TRANSFER_FN_ADOBE_RGB_EOTF_INVERSE,
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TRANSFER_FN_POWER2_4_EOTF,
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TRANSFER_FN_POWER2_4_EOTF_INVERSE,
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};
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TEST_P(build_MPE_curves, build_MPE_curves_test_set)
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{
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const enum transfer_fn *fn = data;
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const cmsContext ctx = 0;
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cmsToneCurve *curve;
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cmsStage *stage;
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cmsPipeline *pipeline;
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struct scalar_stat stat = {};
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curve = build_MPE_curve(ctx, *fn);
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stage = cmsStageAllocToneCurves(ctx, 1, &curve);
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cmsFreeToneCurve(curve);
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pipeline = cmsPipelineAlloc(ctx, 1, 1);
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cmsPipelineInsertStage(pipeline, cmsAT_END, stage);
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compare_pipeline_to_transfer_fn(pipeline, *fn, &stat);
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testlog("Transfer function %s as a segmented curve element, error:\n",
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transfer_fn_name(*fn));
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scalar_stat_print_float(&stat);
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assert(fabs(stat.max) < 1e-7);
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assert(fabs(stat.min) < 1e-7);
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cmsPipelineFree(pipeline);
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}
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