/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
Copyright (C) 2007 Lubos Lunak <l.lunak@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_TASKBARTHUMBNAIL_H
#define KWIN_TASKBARTHUMBNAIL_H

#include <kwineffects.h>
#include <QObject>
#include <QBasicTimer>
#include <QVector>
#include <QVector2D>
#include <QVector4D>

namespace KWin
{

class TaskbarThumbnailEffect
    : public QObject, public Effect
    {
    public:
        TaskbarThumbnailEffect();
        virtual ~TaskbarThumbnailEffect();
        virtual void prePaintScreen( ScreenPrePaintData& data, int time );
        virtual void prePaintWindow( EffectWindow* w, WindowPrePaintData& data, int time );
        virtual void paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data );
        virtual void windowDamaged( EffectWindow* w, const QRect& damage );
        virtual void windowAdded( EffectWindow* w );
        virtual void windowDeleted( EffectWindow* w );
        virtual void propertyNotify( EffectWindow* w, long atom );
    protected:
        virtual void timerEvent(QTimerEvent*);
    private:
        void updateOffscreenSurfaces();
        QVector<QVector4D> createKernel(float delta);
        QVector<QVector2D> createOffsets(int count, float width, Qt::Orientation direction);
        struct Data
            {
            Window window; // thumbnail of this window
            QRect rect;
            };
        long atom;
        GLTexture *offscreenTex;
        GLRenderTarget *offscreenTarget;
        GLShader *shader;
        QMultiHash< EffectWindow*, Data > thumbnails;
        EffectWindowList damagedWindows;
        QBasicTimer timer;
        int uTexUnit;
        int uOffsets;
        int uKernel;
        int uKernelSize;
        bool alphaWindowsOnly;
    };

} // namespace

#endif