85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
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/*
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* Copyright 2020 Collabora, Ltd.
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* Copyright 2021 Advanced Micro Devices, Inc.
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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 "color_util.h"
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#include <assert.h>
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static float
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sRGB_EOTF(float e)
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{
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assert(e >= 0.0f);
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assert(e <= 1.0f);
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if (e <= 0.04045)
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return e / 12.92;
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else
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return pow((e + 0.055) / 1.055, 2.4);
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}
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static float
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sRGB_EOTF_inv(float o)
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{
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assert(o >= 0.0f);
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assert(o <= 1.0f);
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if (o <= 0.04045 / 12.92)
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return o * 12.92;
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else
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return pow(o, 1.0 / 2.4) * 1.055 - 0.055;
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}
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void
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sRGB_linearize(struct color_float *cf)
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{
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cf->r = sRGB_EOTF(cf->r);
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cf->g = sRGB_EOTF(cf->g);
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cf->b = sRGB_EOTF(cf->b);
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}
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void
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sRGB_delinearize(struct color_float *cf)
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{
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cf->r = sRGB_EOTF_inv(cf->r);
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cf->g = sRGB_EOTF_inv(cf->g);
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cf->b = sRGB_EOTF_inv(cf->b);
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}
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struct color_float
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a8r8g8b8_to_float(uint32_t v)
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{
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struct color_float cf;
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cf.a = ((v >> 24) & 0xff) / 255.f;
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cf.r = ((v >> 16) & 0xff) / 255.f;
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cf.g = ((v >> 8) & 0xff) / 255.f;
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cf.b = ((v >> 0) & 0xff) / 255.f;
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return cf;
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}
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