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/* 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 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.
*
* $URL$
* $Id$
*
*/
#include "common/system.h"
#include "common/savefile.h"
#include "graphics/scaler.h"
#include "scumm/scumm.h"
namespace Scumm {
#define THMB_VERSION 1
struct ThumbnailHeader {
uint32 type;
uint32 size;
byte version;
uint16 width, height;
byte bpp;
};
#define ThumbnailHeaderSize (4+4+1+2+2+1)
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::SeekableReadStream *file) {
ThumbnailHeader header;
header.type = file->readUint32BE();
// 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_BE('THMB') && header.type != MKID_BE('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(OverlayColor));
OverlayColor* pixels = (OverlayColor *)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;
#if !defined(__DS__)
if (!createThumbnailFromScreen(&thumb))
#endif
thumb.create(kThumbnailWidth, kThumbnailHeight2, sizeof(uint16));
ThumbnailHeader header;
header.type = MKID_BE('THMB');
header.size = ThumbnailHeaderSize + thumb.w*thumb.h*thumb.bytesPerPixel;
header.version = THMB_VERSION;
header.width = thumb.w;
header.height = thumb.h;
header.bpp = thumb.bytesPerPixel;
file->writeUint32BE(header.type);
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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