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palette.cpp

/* ScummVM - Kyrandia Interpreter
 * Copyright (C) 2003-2004 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/kyra/palette.cpp,v 1.4 2004/11/14 20:11:22 sev Exp $
 *
 */

#include "stdafx.h"
#include "resource.h"

#include "common/stream.h"
#include "codecs.h"

namespace Kyra {

Palette::Palette(uint8* data, uint32 size) {
      if (!data) {
            error("resource created without data");
      }
      
      if (size != 768) {
            Common::MemoryReadStream datastream(data, size);
            
            datastream.readSint32LE();
            int imageSize = datastream.readSint16LE();
            
            if (imageSize != 768) {
                  error("decompresed palette is not 768 byte long!");
            }
            
            // lets uncompress this palette :)
            _palette = new uint8[imageSize];
            assert(_palette);
            
            // made decompression
            if (Compression::decode80(data + 10, _palette) != 768) {
                  error("decode80 decompressesize != 768 bytes");
            }
            
            delete [] data;
            data = _palette;
      }
            
      // hmm.. common/system.h Docu is wrong or SDL Backend has a bug :)
      // a palette should have this order:
      // R1-G1-B1-A1-R2-G2-B2-A2-...
      // so we need 4 bytes per color
      _palette = new uint8[256 * 4];
            
      uint8* currentpossrc = &data[0];
      uint8* currentposdst = &_palette[0];
            
      // creates the original pallette (only first 6 bits are used)
      for (uint32 i = 0; i < 256; i++) {
            currentposdst[0] = currentpossrc[0] << 2;
            currentposdst[1] = currentpossrc[1] << 2;
            currentposdst[2] = currentpossrc[2] << 2;
            currentpossrc += 3;
            currentposdst += 4;
      }
            
      delete [] data;
}

} // end of namespace Kyra


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