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image_decoder.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_IMAGEDECODER_H
00024 #define IMAGE_IMAGEDECODER_H
00025 
00026 #include "common/scummsys.h"
00027 #include "common/str.h"
00028 
00029 namespace Common {
00030 class SeekableReadStream;
00031 }
00032 
00033 namespace Graphics {
00034 struct Surface;
00035 }
00036 
00037 namespace Image {
00038 
00045 class ImageDecoder {
00046 public:
00047     virtual ~ImageDecoder() {}
00048 
00060     virtual bool loadStream(Common::SeekableReadStream &stream) = 0;
00061 
00068     virtual void destroy() = 0;
00069 
00079     virtual const Graphics::Surface *getSurface() const = 0;
00080 
00093     virtual const byte *getPalette() const { return 0; }
00094 
00098     virtual bool hasPalette() const { return getPaletteColorCount() != 0; }
00099 
00101     virtual byte getPaletteStartIndex() const { return 0; }
00103     virtual uint16 getPaletteColorCount() const { return 0; }
00104 };
00105 
00106 } // End of namespace Image
00107 
00108 #endif


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