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>
37 lines
1.3 KiB
C
37 lines
1.3 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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#pragma once
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#include <lcms2.h>
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#include "color_util.h"
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cmsToneCurve *
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build_MPE_curve(cmsContext ctx, enum transfer_fn fn);
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cmsStage *
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build_MPE_curve_stage(cmsContext context_id, enum transfer_fn fn);
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