mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-21 06:50:44 +00:00
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef AVFILTER_PALETTE_H
|
|
#define AVFILTER_PALETTE_H
|
|
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/attributes.h"
|
|
|
|
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);
|
|
|
|
#endif /* AVFILTER_PALETTE_H */
|