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png.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 /*
00024  * PNG decoder used in engines:
00025  *  - sword25
00026  *  - wintermute
00027  * Dependencies:
00028  *  - libpng
00029  */
00030 
00031 #ifndef IMAGE_PNG_H
00032 #define IMAGE_PNG_H
00033 
00034 #include "common/scummsys.h"
00035 #include "common/textconsole.h"
00036 #include "graphics/pixelformat.h"
00037 #include "image/image_decoder.h"
00038 
00039 namespace Common {
00040 class SeekableReadStream;
00041 class WriteStream;
00042 }
00043 
00044 namespace Graphics {
00045 struct Surface;
00046 }
00047 
00048 namespace Image {
00049 
00050 class PNGDecoder : public ImageDecoder {
00051 public:
00052     PNGDecoder();
00053     ~PNGDecoder();
00054 
00055     bool loadStream(Common::SeekableReadStream &stream);
00056     void destroy();
00057     const Graphics::Surface *getSurface() const { return _outputSurface; }
00058     const byte *getPalette() const { return _palette; }
00059     uint16 getPaletteColorCount() const { return _paletteColorCount; }
00060     void setSkipSignature(bool skip) { _skipSignature = skip; }
00061 
00062 private:
00063     Graphics::PixelFormat getByteOrderRgbaPixelFormat() const;
00064 
00065     byte *_palette;
00066     uint16 _paletteColorCount;
00067 
00068     // flag to skip the png signature check for headless png files
00069     bool _skipSignature;
00070 
00071     Graphics::Surface *_outputSurface;
00072 };
00073 
00080 bool writePNG(Common::WriteStream &out, const Graphics::Surface &input, const bool bottomUp = false);
00081 
00082 } // End of namespace Image
00083 
00084 #endif


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