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