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59e3f4e598
SGI RLE encoding is slighlty different than the one provided by rle module (especially at high bit depth). The pixel count function however does not change, so it is simply made library-public.
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/*
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* RLE encoder
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_RLE_H
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#define AVCODEC_RLE_H
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#include <stdint.h>
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/**
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* Count up to 127 consecutive pixels which are either all the same or
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* all differ from the previous and next pixels.
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* @param start Pointer to the first pixel
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* @param len Maximum number of pixels
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* @param bpp Bytes per pixel
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* @param same 1 if searching for identical pixel values, 0 for differing
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* @return Number of matching consecutive pixels found
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*/
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int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same);
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/**
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* RLE compress the row, with maximum size of out_size. Value before repeated bytes is (count ^ xor_rep) + add_rep.
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* Value before raw bytes is (count ^ xor_raw) + add_raw.
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* @param outbuf Output buffer
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* @param out_size Maximum output size
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* @param inbuf Input buffer
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* @param bpp Bytes per pixel
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* @param w Image width
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* @return Size of output in bytes, or -1 if larger than out_size
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*/
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int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp, int w,
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int add_rep, int xor_rep, int add_raw, int xor_raw);
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#endif /* AVCODEC_RLE_H */
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