mirror of
https://github.com/libretro/scummvm.git
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f242266f6d
svn-id: r44634
178 lines
4.5 KiB
C++
178 lines
4.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*/
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#include "graphics/imagedec.h"
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#include "common/file.h"
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namespace Graphics {
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//
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// BMP Decoder
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//
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class BMPDecoder : public ImageDecoder {
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public:
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BMPDecoder() {}
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virtual ~BMPDecoder() {}
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bool decodeable(Common::SeekableReadStream &stream);
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Surface *decodeImage(Common::SeekableReadStream &stream, const PixelFormat &format);
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struct BitmapHeader {
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uint16 type;
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uint32 size;
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uint16 res1;
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uint16 res2;
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uint32 imageOffset;
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};
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struct InfoHeader {
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uint32 size;
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uint32 width;
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uint32 height;
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uint16 planes;
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uint16 bitsPerPixel;
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uint32 compression;
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uint32 imageSize;
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uint32 pixelsPerMeterX;
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uint32 pixelsPerMeterY;
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uint32 colorsUsed;
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uint32 colorsImportant;
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};
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};
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bool BMPDecoder::decodeable(Common::SeekableReadStream &stream) {
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BitmapHeader header;
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stream.seek(0);
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header.type = stream.readUint16BE();
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header.size = stream.readUint32LE();
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// TODO: maybe improve this detection
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if (header.size == 0 || header.type != 'BM')
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return false;
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return true;
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}
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Surface *BMPDecoder::decodeImage(Common::SeekableReadStream &stream, const PixelFormat &format) {
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if (!decodeable(stream)) {
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return 0;
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}
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BitmapHeader header;
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InfoHeader info;
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stream.seek(0);
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header.type = stream.readUint16BE();
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header.size = stream.readUint32LE();
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header.res1 = stream.readUint16LE();
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header.res2 = stream.readUint16LE();
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header.imageOffset = stream.readUint32LE();
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if (header.size == 0 || header.type != 'BM') {
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stream.seek(0);
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return 0;
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}
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info.size = stream.readUint32LE();
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info.width = stream.readUint32LE();
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info.height = stream.readUint32LE();
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info.planes = stream.readUint16LE();
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info.bitsPerPixel = stream.readUint16LE();
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info.compression = stream.readUint32LE();
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info.imageSize = stream.readUint32LE();
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info.pixelsPerMeterX = stream.readUint32LE();
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info.pixelsPerMeterY = stream.readUint32LE();
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info.colorsUsed = stream.readUint32LE();
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info.colorsImportant = stream.readUint32LE();
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stream.seek(header.imageOffset);
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if (info.bitsPerPixel != 24) {
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stream.seek(0);
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return 0;
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}
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uint8 r = 0, g = 0, b = 0;
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Surface *newSurf = new Surface;
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assert(newSurf);
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newSurf->create(info.width, info.height, sizeof(OverlayColor));
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assert(newSurf->pixels);
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OverlayColor *curPixel = (OverlayColor*)newSurf->pixels + (newSurf->h-1) * newSurf->w;
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int pitchAdd = info.width % 4;
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for (int i = 0; i < newSurf->h; ++i) {
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for (int i2 = 0; i2 < newSurf->w; ++i2) {
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b = stream.readByte();
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g = stream.readByte();
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r = stream.readByte();
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*curPixel = format.RGBToColor(r, g, b);
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++curPixel;
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}
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stream.seek(pitchAdd, SEEK_CUR);
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curPixel -= newSurf->w*2;
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}
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stream.seek(0);
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return newSurf;
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}
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#pragma mark -
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Surface *ImageDecoder::loadFile(const Common::String &name, const PixelFormat &format) {
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Surface *newSurf = 0;
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Common::File imageFile;
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if (imageFile.open(name)) {
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newSurf = loadFile(imageFile, format);
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}
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return newSurf;
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}
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Surface *ImageDecoder::loadFile(Common::SeekableReadStream &stream, const PixelFormat &format) {
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// TODO: implement support for bzipped memory
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// FIXME: this is not a very nice solution but it should work
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// for the moment, we should use a different way to get all
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// decoders
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static BMPDecoder bmpDecoder;
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static ImageDecoder *decoderList[] = {
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&bmpDecoder, // for uncompressed .BMP files
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0
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};
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ImageDecoder *decoder = 0;
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for (int i = 0; decoderList[i] != 0; ++i) {
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if (decoderList[i]->decodeable(stream)) {
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decoder = decoderList[i];
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break;
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}
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}
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if (!decoder)
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return 0;
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return decoder->decodeImage(stream, format);
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}
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} // End of namespace Graphics
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