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/*
* Copyright (c) 2022 Niklas Haas
* 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
*/
/**
* @file
* Various functions for dealing with ICC profiles
*/
#ifndef AVFILTER_FFLCMS2_H
#define AVFILTER_FFLCMS2_H
#include "libavutil/frame.h"
#include "libavutil/pixfmt.h"
#include "colorspace.h"
#include <lcms2.h>
typedef struct FFIccContext {
void *avctx;
cmsContext ctx;
cmsToneCurve *curves[AVCOL_TRC_NB]; /* tone curve cache */
} FFIccContext;
/**
* Initializes an FFIccContext. This must be done prior to using it.
*
* Returns 0 on success, or a negative error code.
*/
int ff_icc_context_init(FFIccContext *s, void *avctx);
void ff_icc_context_uninit(FFIccContext *s);
/**
* Generate an ICC profile for a given combination of color primaries and
* transfer function. Both values must be set to valid entries (not
* "undefined") for this function to work.
*
* Returns 0 on success, or a negative error code.
*/
int ff_icc_profile_generate(FFIccContext *s,
enum AVColorPrimaries color_prim,
enum AVColorTransferCharacteristic color_trc,
cmsHPROFILE *out_profile);
/**
* Attach an ICC profile to a frame. Helper wrapper around cmsSaveProfileToMem
* and av_frame_new_side_data_from_buf.
*
* Returns 0 on success, or a negative error code.
*/
int ff_icc_profile_attach(FFIccContext *s, cmsHPROFILE profile, AVFrame *frame);
/**
* Read the color primaries and white point coefficients encoded by an ICC
* profile, and return the raw values in `out_primaries`.
*
* Returns 0 on success, or a negative error code.
*/
int ff_icc_profile_read_primaries(FFIccContext *s, cmsHPROFILE profile,
struct ColorPrimaries *out_primaries);
/**
* Attempt detecting the transfer characteristic that best approximates the
* transfer function encoded by an ICC profile. Sets `out_trc` to
* AVCOL_TRC_UNSPECIFIED if no clear match can be identified.
*
* Returns 0 on success (including no match), or a negative error code.
*/
int ff_icc_profile_detect_transfer(FFIccContext *s, cmsHPROFILE profile,
enum AVColorTransferCharacteristic *out_trc);
#endif /* AVFILTER_FFLCMS2_H */
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