lanczosfilter.h [kde-workspace/kwin/lanczosfilter.h]

1	/********************************************************************
2	KWin - the KDE window manager
3	This file is part of the KDE project.
4
5	Copyright (C) 2010 by Fredrik Höglund <fredrik@kde.org>
6	Copyright (C) 2010 Martin Gräßlin <mgraesslin@kde.org>
7
8	This program is free software; you can redistribute it and/or modify
9	it under the terms of the GNU General Public License as published by
10	the Free Software Foundation; either version 2 of the License, or
11	(at your option) any later version.
12
13	This program is distributed in the hope that it will be useful,
14	but WITHOUT ANY WARRANTY; without even the implied warranty of
15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	GNU General Public License for more details.
17
18	You should have received a copy of the GNU General Public License
19	along with this program. If not, see <http://www.gnu.org/licenses/>.
20	*********************************************************************/
21
22	#ifndef KWIN_LANCZOSFILTER_P_H
23	#define KWIN_LANCZOSFILTER_P_H
24
25	#include <QObject>
26	#include <QBasicTimer>
27	#include <QVector>
28	#include <QVector2D>
29	#include <QVector4D>
30
31	#include <kwinconfig.h>
32
33	namespace KWin
34	{
35
36	class EffectWindow;
37	class EffectWindowImpl;
38	class WindowPaintData;
39	class GLTexture;
40	class GLRenderTarget;
41	class GLShader;
42
43	class LanczosFilter
44	: public QObject
45	{
46	Q_OBJECT
47
48	public:
49	explicit LanczosFilter(QObject* parent = `0`);
50	~LanczosFilter();
51	void performPaint(EffectWindowImpl* w, int mask, QRegion region, WindowPaintData& data);
52
53	protected:
54	virtual void timerEvent(QTimerEvent*);
55	private:
56	void init();
57	void updateOffscreenSurfaces();
58	void setUniforms();
59	void discardCacheTexture(EffectWindow *w);
60
61	void createKernel(float delta, int *kernelSize);
62	void createOffsets(int count, float width, Qt::Orientation direction);
63	GLTexture *m_offscreenTex;
64	GLRenderTarget *m_offscreenTarget;
65	QBasicTimer m_timer;
66	bool m_inited;
67	QScopedPointer<GLShader> m_shader;
68	int m_uTexUnit;
69	int m_uOffsets;
70	int m_uKernel;
71	QVector2D m_offsets[`16`];
72	QVector4D m_kernel[`16`];
73	};
74
75	} // namespace
76
77	#endif // KWIN_LANCZOSFILTER_P_H
78