aboutsummaryrefslogtreecommitdiff
path: root/graphics/decoders/jpeg.h
blob: 8fd03ca86b4516e4396c6aca822c15a917df9b4f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

/**
 * @file
 * Image decoder used in engines:
 *  - groovie
 *  - mohawk
 *  - wintermute
 */

#ifndef GRAPHICS_JPEG_H
#define GRAPHICS_JPEG_H

#include "graphics/surface.h"
#include "graphics/decoders/image_decoder.h"

namespace Common {
class SeekableReadStream;
}

namespace Graphics {

class JPEGDecoder : public ImageDecoder {
public:
	JPEGDecoder();
	~JPEGDecoder();

	// ImageDecoder API
	virtual void destroy();
	virtual bool loadStream(Common::SeekableReadStream &str);
	virtual const Surface *getSurface() const;

	// Special API for JPEG
	enum ColorSpace {
		/**
		 * Output 32bit RGBA data.
		 *
		 * This is the default output.
		 */
		kColorSpaceRGBA,

		/**
		 * Output (interleaved) YUV data.
		 *
		 * Be aware that some images cannot be output in YUV mode.
		 * These are (non-standard) JPEG images which are in RGB colorspace.
		 *
		 * The resulting Surface will have a PixelFormat with 3 bytes per
		 * pixel and the remaining entries are completely zeroed. This works
		 * around the fact that PixelFormat can only describe RGB formats.
		 *
		 * You should only use this when you are really aware of what you are
		 * doing!
		 */
		kColorSpaceYUV
	};

	/**
	 * Request the output color space. This can be used to obtain raw YUV
	 * data from the JPEG file. But this might not work for all files!
	 *
	 * The decoder itself defaults to RGBA.
	 *
	 * @param outSpace The color space to output.
	 */
	void setOutputColorSpace(ColorSpace outSpace) { _colorSpace = outSpace; }

private:
	Graphics::Surface _surface;
	ColorSpace _colorSpace;
};

} // End of Graphics namespace

#endif // GRAPHICS_JPEG_H