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color_utils.h
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1 /*
2  * Copyright (c) 2015 Kevin Wheatley <kevin.j.wheatley@gmail.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVUTIL_COLOR_UTILS_H
22 #define AVUTIL_COLOR_UTILS_H
23 
24 
25 #include "libavutil/pixfmt.h"
26 
27 /**
28  * Determine a suitable 'gamma' value to match the supplied
29  * AVColorTransferCharacteristic.
30  *
31  * See Apple Technical Note TN2257 (https://developer.apple.com/library/mac/technotes/tn2257/_index.html)
32  *
33  * @return Will return an approximation to the simple gamma function matching
34  * the supplied Transfer Characteristic, Will return 0.0 for any
35  * we cannot reasonably match against.
36  */
38 
39 #endif