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/* ScummVM - Scumm Interpreter
* Copyright (C) 2006 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.
*
* $URL$
* $Id$
*/
#include "graphics/imagedec.h"
#include "common/system.h"
#include "common/file.h"
namespace Graphics {
//
// BMP Decoder
//
class BMPDecoder : public ImageDecoder {
public:
BMPDecoder() {}
virtual ~BMPDecoder() {}
bool decodeable(Common::SeekableReadStream &stream);
Surface *decodeImage(Common::SeekableReadStream &stream);
struct BitmapHeader {
uint16 type;
uint32 size;
uint16 res1;
uint16 res2;
uint32 imageOffset;
};
struct InfoHeader {
uint32 size;
uint32 width;
uint32 height;
uint16 planes;
uint16 bitsPerPixel;
uint32 compression;
uint32 imageSize;
uint32 pixelsPerMeterX;
uint32 pixelsPerMeterY;
uint32 colorsUsed;
uint32 colorsImportant;
};
};
bool BMPDecoder::decodeable(Common::SeekableReadStream &stream) {
BitmapHeader header;
stream.seek(0);
header.type = stream.readUint16BE();
header.size = stream.readUint32LE();
// TODO: maybe improve this detection
if (header.size == 0 || header.type != 'BM')
return false;
return true;
}
Surface *BMPDecoder::decodeImage(Common::SeekableReadStream &stream) {
if (!decodeable(stream)) {
return 0;
}
BitmapHeader header;
InfoHeader info;
stream.seek(0);
header.type = stream.readUint16BE();
header.size = stream.readUint32LE();
header.res1 = stream.readUint16LE();
header.res2 = stream.readUint16LE();
header.imageOffset = stream.readUint32LE();
if (header.size == 0 || header.type != 'BM') {
stream.seek(0);
return 0;
}
info.size = stream.readUint32LE();
info.width = stream.readUint32LE();
info.height = stream.readUint32LE();
info.planes = stream.readUint16LE();
info.bitsPerPixel = stream.readUint16LE();
info.compression = stream.readUint32LE();
info.imageSize = stream.readUint32LE();
info.pixelsPerMeterX = stream.readUint32LE();
info.pixelsPerMeterY = stream.readUint32LE();
info.colorsUsed = stream.readUint32LE();
info.colorsImportant = stream.readUint32LE();
stream.seek(header.imageOffset);
if (info.bitsPerPixel != 24) {
stream.seek(0);
return 0;
}
uint8 r = 0, g = 0, b = 0;
Surface *newSurf = new Surface;
assert(newSurf);
newSurf->create(info.width, info.height, sizeof(OverlayColor));
assert(newSurf->pixels);
OverlayColor *curPixel = (OverlayColor*)newSurf->pixels + (newSurf->h-1) * newSurf->w;
int pitchAdd = info.width % 4;
for (int i = 0; i < newSurf->h; ++i) {
for (int i2 = 0; i2 < newSurf->w; ++i2) {
b = stream.readByte();
g = stream.readByte();
r = stream.readByte();
*curPixel = g_system->RGBToColor(r, g, b);
++curPixel;
}
stream.seek(pitchAdd, SEEK_CUR);
curPixel -= newSurf->w*2;
}
stream.seek(0);
return newSurf;
}
#pragma mark -
Surface *ImageDecoder::loadFile(const Common::String &name) {
Surface *newSurf = 0;
Common::File imageFile;
if (imageFile.open(name)) {
newSurf = loadFile(imageFile);
}
return newSurf;
}
Surface *ImageDecoder::loadFile(Common::SeekableReadStream &stream) {
// TODO: implement support for bzipped memory
// FIXME: this is not a very nice solution but it should work
// for the moment, we should use a different way to get all
// decoders
static BMPDecoder bmpDecoder;
static ImageDecoder *decoderList[] = {
&bmpDecoder, // for uncompressed .BMP files
0
};
ImageDecoder *decoder = 0;
for (int i = 0; decoderList[i] != 0; ++i) {
if (decoderList[i]->decodeable(stream)) {
decoder = decoderList[i];
break;
}
}
if (!decoder)
return 0;
return decoder->decodeImage(stream);
}
} // end of namespace Graphics
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