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thumbnail.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2005 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 file 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/thumbnail.cpp,v 1.9.2.1 2005/10/18 02:11:25 sev Exp $
 *
 */

#include "common/stdafx.h"
#include "common/system.h"
#include "common/savefile.h"
#include "common/scaler.h"
#include "scumm/scumm.h"

namespace Scumm {

#define THMB_VERSION 1

#if !defined(__GNUC__)
      #pragma START_PACK_STRUCTS
#endif

struct ThumbnailHeader {
      uint32 type;
      uint32 size;
      byte version;
      uint16 width, height;
      byte bpp;
} GCC_PACK;

#if !defined(__GNUC__)
      #pragma END_PACK_STRUCTS
#endif


inline void colorToRGB(uint16 color, uint8 &r, uint8 &g, uint8 &b) {
      r = (((color >> 11) & 0x1F) << 3);
      g = (((color >> 5) & 0x3F) << 2);
      b = ((color&0x1F) << 3);
}

Graphics::Surface *ScummEngine::loadThumbnail(Common::InSaveFile *file) {
      ThumbnailHeader header;
      file->read(&header.type, 4);
      // We also accept the bad 'BMHT' header here, for the sake of compatibility
      // with some older savegames which were written incorrectly due to a bug in
      // ScummVM which wrote the thumb header type incorrectly on LE systems.
      if (header.type != MKID('THMB') && header.type != MKID('BMHT'))
            return 0;

      header.size = file->readUint32BE();
      header.version = file->readByte();

      if (header.version > THMB_VERSION) {
            file->skip(header.size - 9);
            warning("Loading a newer thumbnail version");
            return 0;
      }

      header.width = file->readUint16BE();
      header.height = file->readUint16BE();
      header.bpp = file->readByte();

      // TODO: support other bpp values than 2
      if (header.bpp != 2) {
            file->skip(header.size - 14);
            return 0;
      }

      Graphics::Surface *thumb = new Graphics::Surface();
      thumb->create(header.width, header.height, sizeof(uint16));

      uint16* pixels = (uint16 *)thumb->pixels;

      for (int y = 0; y < thumb->h; ++y) {
            for (int x = 0; x < thumb->w; ++x) {
                  uint8 r, g, b;
                  colorToRGB(file->readUint16BE(), r, g, b);

                  // converting to current OSystem Color
                  *pixels++ = _system->RGBToColor(r, g, b);
            }
      }

      return thumb;
}

void ScummEngine::saveThumbnail(Common::OutSaveFile *file) {
      Graphics::Surface thumb;

#ifndef PALMOS_68K
      if (!createThumbnailFromScreen(&thumb))
#endif
            thumb.create(kThumbnailWidth, kThumbnailHeight2, sizeof(uint16));

      ThumbnailHeader header;
      header.type = MKID('THMB');
#ifdef PALMOS_ARM
      // sizeof(header) is hardcoded here, because the compiler add padding to
      // have a 4byte aligned struct and there is no easy way to pack it.
      header.size = 14 + thumb.w*thumb.h*thumb.bytesPerPixel;
#else
      header.size = sizeof(header) + thumb.w*thumb.h*thumb.bytesPerPixel;
#endif
      header.version = THMB_VERSION;
      header.width = thumb.w;
      header.height = thumb.h;
      header.bpp = thumb.bytesPerPixel;

      file->write(&header.type, 4);
      file->writeUint32BE(header.size);
      file->writeByte(header.version);
      file->writeUint16BE(header.width);
      file->writeUint16BE(header.height);
      file->writeByte(header.bpp);

      // TODO: for later this shouldn't be casted to uint16...
      uint16* pixels = (uint16 *)thumb.pixels;
      for (uint16 p = 0; p < thumb.w*thumb.h; ++p, ++pixels)
            file->writeUint16BE(*pixels);

      thumb.free();
}

} // end of namespace Scumm

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