1 /* ScummVM - Graphic Adventure Engine
2  *
3  * ScummVM is the legal property of its developers, whose names
4  * are too numerous to list here. Please refer to the COPYRIGHT
5  * file distributed with this source distribution.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20  *
21  */
22 
23 /*
24  * PNG decoder used in engines:
25  *  - sword25
26  *  - wintermute
27  * Dependencies:
28  *  - libpng
29  */
30 
31 #ifndef IMAGE_PNG_H
32 #define IMAGE_PNG_H
33 
34 #include "common/scummsys.h"
35 #include "common/textconsole.h"
36 #include "image/image_decoder.h"
37 
38 namespace Common {
39 class SeekableReadStream;
40 class WriteStream;
41 }
42 
43 namespace Graphics {
44 struct Surface;
45 }
46 
47 namespace Image {
48 
49 class PNGDecoder : public ImageDecoder {
50 public:
51 	PNGDecoder();
52 	~PNGDecoder();
53 
54 	bool loadStream(Common::SeekableReadStream &stream);
55 	void destroy();
getSurface()56 	const Graphics::Surface *getSurface() const { return _outputSurface; }
getPalette()57 	const byte *getPalette() const { return _palette; }
getPaletteColorCount()58 	uint16 getPaletteColorCount() const { return _paletteColorCount; }
setSkipSignature(bool skip)59 	void setSkipSignature(bool skip) { _skipSignature = skip; }
60 private:
61 	byte *_palette;
62 	uint16 _paletteColorCount;
63 
64 	// flag to skip the png signature check for headless png files
65 	bool _skipSignature;
66 
67 	Graphics::Surface *_outputSurface;
68 };
69 
70 /**
71  * Outputs a compressed PNG stream of the given input surface.
72  *
73  * @param bottomUp Flip the vertical axis so pixel data is drawn from the
74  * bottom up, instead of from the top down.
75  */
76 bool writePNG(Common::WriteStream &out, const Graphics::Surface &input, const bool bottomUp = false);
77 
78 } // End of namespace Image
79 
80 #endif
81