3e689ff201
This provides a significant performance improvement especially for Present Windows. Whenever a lanczos resampling is done the resulted texture is cached, till the window is damaged or a texture of different size is required. This means that for a taskbar thumbnail the resampling only occurs once unless the window is damaged and for present windows it only occurs when the windows are resized and then only after the windows have already been moved. Highlighting windows does not cause a resampling any more. See review request http://svn.reviewboard.kde.org/r/5708/ svn path=/trunk/KDE/kdebase/workspace/; revision=1191874
76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2010 by Fredrik Höglund <fredrik@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#ifndef KWIN_LANCZOSFILTER_P_H
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#define KWIN_LANCZOSFILTER_P_H
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#include <QObject>
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#include <QBasicTimer>
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#include <QVector>
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#include <QVector2D>
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#include <QVector4D>
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#include <kwinconfig.h>
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namespace KWin
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{
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class EffectWindowImpl;
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class WindowPaintData;
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class GLTexture;
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class GLRenderTarget;
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class GLShader;
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class LanczosFilter
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: public QObject
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{
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Q_OBJECT
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public:
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LanczosFilter(QObject* parent = 0);
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~LanczosFilter();
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void performPaint( EffectWindowImpl* w, int mask, QRegion region, WindowPaintData& data );
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protected:
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virtual void timerEvent(QTimerEvent*);
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private:
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void init();
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void updateOffscreenSurfaces();
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void createKernel(float delta, int *kernelSize);
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void createOffsets(int count, float width, Qt::Orientation direction);
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#ifdef KWIN_HAVE_OPENGL_COMPOSITING
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void prepareRenderStates( GLTexture* tex, double opacity, double brightness, double saturation );
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void restoreRenderStates( GLTexture* tex, double opacity, double brightness, double saturation );
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GLTexture *m_offscreenTex;
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GLRenderTarget *m_offscreenTarget;
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GLShader *m_shader;
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#endif
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QBasicTimer m_timer;
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QVector2D m_offsets[25];
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QVector4D m_kernel[25];
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bool m_inited;
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int m_uTexUnit;
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int m_uOffsets;
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int m_uKernel;
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};
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} // namespace
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#endif // KWIN_LANCZOSFILTER_P_H
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