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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2010 by Fredrik Höglund <fredrik@kde.org>
Copyright (C) 2010 Martin Gräßlin <mgraesslin@kde.org>
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, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#ifndef KWIN_LANCZOSFILTER_P_H
#define KWIN_LANCZOSFILTER_P_H
#include <QObject>
#include <QBasicTimer>
#include <QVector>
#include <QVector2D>
#include <QVector4D>
#include <kwinconfig.h>
#include <kwin_export.h>
namespace KWin
{
class EffectWindow;
class EffectWindowImpl;
class WindowPaintData;
class GLTexture;
class GLRenderTarget;
class GLShader;
class KWIN_EXPORT LanczosFilter
: public QObject
{
Q_OBJECT
public:
explicit LanczosFilter(QObject* parent = 0);
~LanczosFilter();
void performPaint(EffectWindowImpl* w, int mask, QRegion region, WindowPaintData& data);
protected:
virtual void timerEvent(QTimerEvent*);
private:
void init();
void updateOffscreenSurfaces();
void setUniforms();
void discardCacheTexture(EffectWindow *w);
void createKernel(float delta, int *kernelSize);
void createOffsets(int count, float width, Qt::Orientation direction);
GLTexture *m_offscreenTex;
GLRenderTarget *m_offscreenTarget;
QBasicTimer m_timer;
bool m_inited;
QScopedPointer<GLShader> m_shader;
int m_uOffsets;
int m_uKernel;
QVector2D m_offsets[16];
QVector4D m_kernel[16];
};
} // namespace
#endif // KWIN_LANCZOSFILTER_P_H
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