blob: a92edf7a26b49329ce6bb851bab2efea4f667d75
| 1 | /* |
| 2 | * RLE encoder |
| 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 AVCODEC_RLE_H |
| 22 | #define AVCODEC_RLE_H |
| 23 | |
| 24 | #include <stdint.h> |
| 25 | |
| 26 | /** |
| 27 | * Count up to 127 consecutive pixels which are either all the same or |
| 28 | * all differ from the previous and next pixels. |
| 29 | * @param start Pointer to the first pixel |
| 30 | * @param len Maximum number of pixels |
| 31 | * @param bpp Bytes per pixel |
| 32 | * @param same 1 if searching for identical pixel values, 0 for differing |
| 33 | * @return Number of matching consecutive pixels found |
| 34 | */ |
| 35 | int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same); |
| 36 | |
| 37 | /** |
| 38 | * RLE compress the row, with maximum size of out_size. |
| 39 | * Value before repeated bytes is (count ^ xor_rep) + add_rep. |
| 40 | * Value before raw bytes is (count ^ xor_raw) + add_raw. |
| 41 | * @param outbuf Output buffer |
| 42 | * @param out_size Maximum output size |
| 43 | * @param inbuf Input buffer |
| 44 | * @param bpp Bytes per pixel |
| 45 | * @param w Image width |
| 46 | * @return Size of output in bytes, or -1 if larger than out_size |
| 47 | */ |
| 48 | int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp, |
| 49 | int w, int add_rep, int xor_rep, int add_raw, int xor_raw); |
| 50 | |
| 51 | #endif /* AVCODEC_RLE_H */ |
| 52 |