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qtrle.h

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #ifndef IMAGE_CODECS_QTRLE_H
00024 #define IMAGE_CODECS_QTRLE_H
00025 
00026 #include "graphics/pixelformat.h"
00027 #include "image/codecs/codec.h"
00028 
00029 namespace Image {
00030 
00036 class QTRLEDecoder : public Codec {
00037 public:
00038     QTRLEDecoder(uint16 width, uint16 height, byte bitsPerPixel);
00039     ~QTRLEDecoder();
00040 
00041     const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream);
00042     Graphics::PixelFormat getPixelFormat() const;
00043 
00044     bool containsPalette() const { return _ditherPalette != 0; }
00045     const byte *getPalette() { _dirtyPalette = false; return _ditherPalette; }
00046     bool hasDirtyPalette() const { return _dirtyPalette; }
00047     bool canDither(DitherType type) const;
00048     void setDither(DitherType type, const byte *palette);
00049 
00050 private:
00051     byte _bitsPerPixel;
00052     Graphics::Surface *_surface;
00053     uint16 _width, _height;
00054     uint32 _paddedWidth;
00055     byte *_ditherPalette;
00056     bool _dirtyPalette;
00057     byte *_colorMap;
00058 
00059     void createSurface();
00060 
00061     void decode1(Common::SeekableReadStream &stream, uint32 rowPtr, uint32 linesToChange);
00062     void decode2_4(Common::SeekableReadStream &stream, uint32 rowPtr, uint32 linesToChange, byte bpp);
00063     void decode8(Common::SeekableReadStream &stream, uint32 rowPtr, uint32 linesToChange);
00064     void decode16(Common::SeekableReadStream &stream, uint32 rowPtr, uint32 linesToChange);
00065     void decode24(Common::SeekableReadStream &stream, uint32 rowPtr, uint32 linesToChange);
00066     void dither24(Common::SeekableReadStream &stream, uint32 rowPtr, uint32 linesToChange);
00067     void decode32(Common::SeekableReadStream &stream, uint32 rowPtr, uint32 linesToChange);
00068 };
00069 
00070 } // End of namespace Image
00071 
00072 #endif


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