rle_compress.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef QDENGINE_SYSTEM_GRAPHICS_RLE_COMPRESS_H
#define QDENGINE_SYSTEM_GRAPHICS_RLE_COMPRESS_H


namespace QDEngine {

class RLEBuffer {
public:
    RLEBuffer();
    RLEBuffer(const RLEBuffer &buf);
    ~RLEBuffer();

    RLEBuffer &operator = (const RLEBuffer &buf);

    bool encode(int sx, int sy, const byte *buf);

    bool decode_line(int y, byte *out_buf) const;

    bool decode_line(int y, int buffer_id = 0) const;

    bool decode_pixel(int x, int y, uint32 &pixel);

    static const byte *get_buffer(int buffer_id);

    void resize_buffers();

    uint32 size();
    int line_length();
    int line_header_length(int line_num) const;

    uint32 header_size() const {
        return _header.size();
    }
    uint32 data_size() const {
        return _data.size();
    }

    const int8 *header_ptr(int y = 0) const {
        return &*(_header.begin() + _header_offset[y]);
    }
    const uint32 *data_ptr(int y = 0) const {
        return &*(_data.begin() + _data_offset[y]);
    }

    bool load(Common::SeekableReadStream *fh);

    bool convert_data(int bits_per_pixel = 16);

    static void releaseBuffers();

private:
    Std::vector<uint32> _header_offset;
    Std::vector<uint32> _data_offset;

    Std::vector<int8> _header;
    Std::vector<uint32> _data;

    int _bits_per_pixel;

    friend bool operator == (const RLEBuffer &buf1, const RLEBuffer &buf2);
};

} // namespace QDEngine

#endif // QDENGINE_SYSTEM_GRAPHICS_RLE_COMPRESS_H