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image/codecs/codec.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_CODEC_H
00024 #define IMAGE_CODECS_CODEC_H
00025 
00026 #include "graphics/surface.h"
00027 #include "graphics/pixelformat.h"
00028 
00029 namespace Common {
00030 class SeekableReadStream;
00031 }
00032 
00033 namespace Image {
00034 
00056 class Codec {
00057 public:
00058     Codec() {}
00059     virtual ~Codec() {}
00060 
00064     enum DitherType {
00066         kDitherTypeUnknown,
00067 
00069         kDitherTypeVFW,
00070 
00072         kDitherTypeQT
00073     };
00074 
00081     virtual const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) = 0;
00082 
00087     virtual Graphics::PixelFormat getPixelFormat() const = 0;
00088 
00092     virtual bool containsPalette() const { return false; }
00093 
00097     virtual const byte *getPalette() { return 0; }
00098 
00102     virtual bool hasDirtyPalette() const { return false; }
00103 
00107     virtual bool canDither(DitherType type) const { return false; }
00108 
00112     virtual void setDither(DitherType type, const byte *palette) {}
00113 
00117     static byte *createQuickTimeDitherTable(const byte *palette, uint colorCount);
00118 };
00119 
00123 Codec *createBitmapCodec(uint32 tag, int width, int height, int bitsPerPixel);
00124 
00128 Codec *createQuickTimeCodec(uint32 tag, int width, int height, int bitsPerPixel);
00129 
00130 } // End of namespace Image
00131 
00132 #endif


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