The official excuse for this effect is that I wanted to try

drawing a window several times.


svn path=/branches/work/kwin_composite/; revision=642577

CMakeLists.txt

@@ -76,6 +76,7 @@ set(kwin_KDEINIT_SRCS
    effects/desktopchangeslide.cpp
    effects/boxswitch.cpp
    effects/fallapart.cpp
+   effects/drunken.cpp
    effects/test_input.cpp
    effects/test_thumbnail.cpp
    )

effects.cpp

@@ -18,6 +18,7 @@ License. See the file "COPYING" for the exact licensing terms.
 #include "effects/boxswitch.h"
 #include "effects/desktopchangeslide.h"
 #include "effects/dialogparent.h"
+#include "effects/drunken.h"
 #include "effects/fade.h"
 #include "effects/howto.h"
 #include "effects/maketransparent.h"
@@ -194,6 +195,7 @@ EffectsHandler::EffectsHandler()
     registerEffect("DialogParent", new GenericEffectFactory<DialogParentEffect>);
     registerEffect("DesktopChangeSlide", new GenericEffectFactory<DesktopChangeSlideEffect>);
     registerEffect("BoxSwitch", new GenericEffectFactory<BoxSwitchEffect>);
+    registerEffect("Drunken", new GenericEffectFactory<DrunkenEffect>);
 
     registerEffect("TestInput", new GenericEffectFactory<TestInputEffect>);
     registerEffect("TestThumbnail", new GenericEffectFactory<TestThumbnailEffect>);

effects/drunken.cpp

@@ -0,0 +1,75 @@
+/*****************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
+
+You can Freely distribute this program under the GNU General Public
+License. See the file "COPYING" for the exact licensing terms.
+******************************************************************/
+
+#include "drunken.h"
+
+#include <math.h>
+
+namespace KWinInternal
+{
+
+void DrunkenEffect::prePaintScreen( int* mask, QRegion* region, int time )
+    {
+    if( !windows.isEmpty())
+        *mask |= Scene::PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
+    effects->prePaintScreen( mask, region, time );
+    }
+
+void DrunkenEffect::prePaintWindow( EffectWindow* w, int* mask, QRegion* region, int time )
+    {
+    if( windows.contains( w ))
+        {
+        windows[ w ] += time / 1000.;
+        if( windows[ w ] < 1 )
+            *mask |= Scene::PAINT_WINDOW_TRANSFORMED;
+        else
+            windows.remove( w );
+        }
+    effects->prePaintWindow( w, mask, region, time );
+    }
+
+void DrunkenEffect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
+    {
+    if( !windows.contains( w ))
+        {
+        effects->paintWindow( w, mask, region, data );
+        return;
+        }
+    WindowPaintData d1 = data;
+    // 4 cycles, decreasing amplitude
+    int diff = int( sin( windows[ w ] * 8 * M_PI ) * ( 1 - windows[ w ] ) * 10 );
+    d1.xTranslate -= diff;
+    d1.opacity *= 0.5;
+    effects->paintWindow( w, mask, region, d1 );
+    WindowPaintData d2 = data;
+    d2.xTranslate += diff;
+    d2.opacity *= 0.5;
+    effects->paintWindow( w, mask, region, d2 );
+    }
+
+void DrunkenEffect::postPaintWindow( EffectWindow* w )
+    {
+    if( windows.contains( w ))
+        w->window()->addRepaintFull();
+    effects->postPaintWindow( w );
+    }
+
+void DrunkenEffect::windowAdded( EffectWindow* w )
+    {
+    windows[ w ] = 0;
+    w->window()->addRepaintFull();
+    }
+
+void DrunkenEffect::windowClosed( EffectWindow* w )
+    {
+    windows.remove( w );
+    }
+
+} // namespace

effects/drunken.h

@@ -0,0 +1,35 @@
+/*****************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
+
+You can Freely distribute this program under the GNU General Public
+License. See the file "COPYING" for the exact licensing terms.
+******************************************************************/
+
+#ifndef KWIN_DRUNKEN_H
+#define KWIN_DRUNKEN_H
+
+#include <effects.h>
+
+namespace KWinInternal
+{
+
+class DrunkenEffect
+    : public Effect
+    {
+    public:
+        virtual void prePaintScreen( int* mask, QRegion* region, int time );
+        virtual void prePaintWindow( EffectWindow* w, int* mask, QRegion* region, int time );
+        virtual void paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data );
+        virtual void postPaintWindow( EffectWindow* w );
+        virtual void windowAdded( EffectWindow* w );
+        virtual void windowClosed( EffectWindow* w );
+    private:
+        QHash< EffectWindow*, double > windows; // progress
+    };
+
+} // namespace
+
+#endif