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codec1.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2005 The ScummVM project
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/scumm/smush/codec1.cpp,v 1.17.2.1 2005/10/18 02:11:25 sev Exp $
 *
 */

#include "common/stdafx.h"
#include "common/scummsys.h"

namespace Scumm {

void smush_decode_codec1(byte *dst, const byte *src, int left, int top, int width, int height, int pitch) {
      byte val, code;
      int32 length;
      int h = height, size_line;

      dst += top * pitch;
      for (h = 0; h < height; h++) {
            size_line = READ_LE_UINT16(src);
            src += 2;
            dst += left;
            while (size_line > 0) {
                  code = *src++;
                  size_line--;
                  length = (code >> 1) + 1;
                  if (code & 1) {
                        val = *src++;
                        size_line--;
                        if (val)
                              memset(dst, val, length);
                        dst += length;
                  } else {
                        size_line -= length;
                        while (length--) {
                              val = *src++;
                              if (val)
                                    *dst = val;
                              dst++;
                        }
                  }
            }
            dst += pitch - left - width;
      }
}

} // End of namespace Scumm

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