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63 lines
1.8 KiB
63 lines
1.8 KiB
/* |
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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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