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/*
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* Copyright (c) 2020 Björn Ottosson
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* Copyright (c) 2022 Clément Bœsch <u pkh me>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_PALETTE_H
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#define AVFILTER_PALETTE_H
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#include <math.h>
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#include <stdint.h>
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#include "libavutil/attributes.h"
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struct Lab {
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int32_t L, a, b;
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};
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/**
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* Map sRGB 8-bit color component to a 16-bit linear value (gamma
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* expand from electrical to optical value).
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*/
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int32_t ff_srgb_u8_to_linear_int(uint8_t x);
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/**
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* Map a 16-bit linear value to a sRGB 8-bit color component (gamma
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* compressed from optical to electrical value).
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*/
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uint8_t ff_linear_int_to_srgb_u8(int32_t x);
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/**
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* sRGB (non-linear) to OkLab conversion
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* @see https://bottosson.github.io/posts/oklab/
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*/
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struct Lab ff_srgb_u8_to_oklab_int(uint32_t srgb);
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/**
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* OkLab to sRGB (non-linear) conversion
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* @see https://bottosson.github.io/posts/oklab/
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*/
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uint32_t ff_oklab_int_to_srgb_u8(struct Lab c);
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/*
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* lowbias32 hashing from https://nullprogram.com/blog/2018/07/31/
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*/
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uint32_t ff_lowbias32(uint32_t x);
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#endif /* AVFILTER_PALETTE_H */
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