| /* |
| * Copyright (c) 2015 Kevin Wheatley <kevin.j.wheatley@gmail.com> |
| * |
| * 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 AVUTIL_COLOR_UTILS_H |
| #define AVUTIL_COLOR_UTILS_H |
| |
| |
| #include "libavutil/pixfmt.h" |
| |
| /** |
| * Determine a suitable 'gamma' value to match the supplied |
| * AVColorTransferCharacteristic. |
| * |
| * See Apple Technical Note TN2257 (https://developer.apple.com/library/mac/technotes/tn2257/_index.html) |
| * |
| * @return Will return an approximation to the simple gamma function matching |
| * the supplied Transfer Characteristic, Will return 0.0 for any |
| * we cannot reasonably match against. |
| */ |
| double avpriv_get_gamma_from_trc(enum AVColorTransferCharacteristic trc); |
| |
| #endif |