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