diff --git a/effects/demo_shakymove.cpp b/effects/demo_shakymove.cpp
index 090bc24cbc..a3a7a2e15e 100644
--- a/effects/demo_shakymove.cpp
+++ b/effects/demo_shakymove.cpp
@@ -33,7 +33,7 @@ void ShakyMoveEffect::prePaintScreen( ScreenPrePaintData& data, int time )
 void ShakyMoveEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data, int time )
     {
     if( windows.contains( w ))
-        data.mask |= PAINT_WINDOW_TRANSFORMED;
+        data.setTransformed();
     effects->prePaintWindow( w, data, time );
     }
 
diff --git a/effects/demo_wavywindows.cpp b/effects/demo_wavywindows.cpp
index d6813978d3..774af8f3f3 100644
--- a/effects/demo_wavywindows.cpp
+++ b/effects/demo_wavywindows.cpp
@@ -39,7 +39,7 @@ void WavyWindowsEffect::prePaintScreen( ScreenPrePaintData& data, int time )
 void WavyWindowsEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data, int time )
     {
     // This window will be transformed by the effect
-    data.mask |= PAINT_WINDOW_TRANSFORMED;
+    data.setTransformed();
     // Check if OpenGL compositing is used
     // Request the window to be divided into cells which are at most 30x30
     //  pixels big
diff --git a/effects/desktopgrid.cpp b/effects/desktopgrid.cpp
index 6a233a4456..66652c1303 100644
--- a/effects/desktopgrid.cpp
+++ b/effects/desktopgrid.cpp
@@ -87,7 +87,7 @@ void DesktopGridEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& dat
         if( w->isOnAllDesktops())
             {
             if( slide_painting_sticky )
-                data.mask |= PAINT_WINDOW_TRANSFORMED;
+                data.setTransformed();
             else
                 w->disablePainting( EffectWindow::PAINT_DISABLED_BY_DESKTOP );
             }
@@ -104,7 +104,7 @@ void DesktopGridEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& dat
             w->disablePainting( EffectWindow::PAINT_DISABLED_BY_DESKTOP );
         if( w == window_move )
             {
-            data.mask |= PAINT_WINDOW_TRANSFORMED;
+            data.setTransformed();
             if( w->isOnAllDesktops() && painting_desktop != posToDesktop( window_move_pos - window_move_diff ))
                 w->disablePainting( EffectWindow::PAINT_DISABLED_BY_DESKTOP );
             }
diff --git a/effects/drunken.cpp b/effects/drunken.cpp
index cb8ef6ebdc..05287e9ab5 100644
--- a/effects/drunken.cpp
+++ b/effects/drunken.cpp
@@ -30,7 +30,7 @@ void DrunkenEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data, i
         {
         windows[ w ] += time / 1000.;
         if( windows[ w ] < 1 )
-            data.mask |= PAINT_WINDOW_TRANSFORMED;
+            data.setTransformed();
         else
             windows.remove( w );
         }
diff --git a/effects/explosioneffect.cpp b/effects/explosioneffect.cpp
index 6a647688d0..5751b01234 100644
--- a/effects/explosioneffect.cpp
+++ b/effects/explosioneffect.cpp
@@ -122,7 +122,7 @@ void ExplosionEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data,
             if( mWindows[ w  ] < 1 )
                 {
                 data.setTranslucent();
-                data.mask |= PAINT_WINDOW_TRANSFORMED;
+                data.setTransformed();
                 w->enablePainting( EffectWindow::PAINT_DISABLED_BY_DELETE );
                 }
             else
diff --git a/effects/fallapart.cpp b/effects/fallapart.cpp
index 2e1e09e10f..beee4717af 100644
--- a/effects/fallapart.cpp
+++ b/effects/fallapart.cpp
@@ -32,7 +32,7 @@ void FallApartEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data,
         if( windows[ w ] < 1 )
             {
             windows[ w ] += time / 1000.;
-            data.mask |= PAINT_WINDOW_TRANSFORMED;
+            data.setTransformed();
             w->enablePainting( EffectWindow::PAINT_DISABLED_BY_DELETE );
             // Request the window to be divided into cells
             data.quads = data.quads.makeGrid( 40 );
diff --git a/effects/flame.cpp b/effects/flame.cpp
index d875123bd6..5e2da48cc5 100644
--- a/effects/flame.cpp
+++ b/effects/flame.cpp
@@ -32,7 +32,7 @@ void FlameEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data, int
         if( windows[ w ] < 1 )
             {
             windows[ w ] += time / 500.;
-            data.mask |= PAINT_WINDOW_TRANSFORMED;
+            data.setTransformed();
             w->enablePainting( EffectWindow::PAINT_DISABLED_BY_DELETE );
             data.quads = data.quads.splitAtY( windows[ w ] * w->height());
             }
diff --git a/effects/minimizeanimation.cpp b/effects/minimizeanimation.cpp
index d9365597a2..0862e4fab3 100644
--- a/effects/minimizeanimation.cpp
+++ b/effects/minimizeanimation.cpp
@@ -55,7 +55,7 @@ void MinimizeAnimationEffect::prePaintWindow( EffectWindow* w, WindowPrePaintDat
         if( mAnimationProgress.contains( w ))
             {
             // We'll transform this window
-            data.mask |= PAINT_WINDOW_TRANSFORMED;
+            data.setTransformed();
             w->enablePainting( EffectWindow::PAINT_DISABLED_BY_MINIMIZE );
             }
         else
diff --git a/effects/presentwindows.cpp b/effects/presentwindows.cpp
index 63abbc0592..199d4c5243 100644
--- a/effects/presentwindows.cpp
+++ b/effects/presentwindows.cpp
@@ -101,7 +101,7 @@ void PresentWindowsEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData&
         if( mWindowData.contains(w) )
             {
             // This window will be transformed by the effect
-            data.mask |= Effect::PAINT_WINDOW_TRANSFORMED;
+            data.setTransformed();
             w->enablePainting( EffectWindow::PAINT_DISABLED_BY_MINIMIZE );
             w->enablePainting( EffectWindow::PAINT_DISABLED_BY_DESKTOP );
             // If it's minimized window or on another desktop and effect is not
diff --git a/effects/scalein.cpp b/effects/scalein.cpp
index 4572ec439f..c8ebbf42db 100644
--- a/effects/scalein.cpp
+++ b/effects/scalein.cpp
@@ -28,7 +28,7 @@ void ScaleInEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data, i
         {
         windows[ w ] += time / 500.; // complete change in 500ms
         if( windows[ w ] < 1 )
-            data.mask |= PAINT_WINDOW_TRANSFORMED;
+            data.setTransformed();
         else
             windows.remove( w );
         }
diff --git a/lib/kwineffects.cpp b/lib/kwineffects.cpp
index 2ae9b86892..29d0bb6eea 100644
--- a/lib/kwineffects.cpp
+++ b/lib/kwineffects.cpp
@@ -29,6 +29,12 @@ void WindowPrePaintData::setTranslucent()
     clip = QRegion(); // cannot clip, will be transparent
     }
 
+void WindowPrePaintData::setTransformed()
+    {
+    mask |= Effect::PAINT_WINDOW_TRANSFORMED;
+    }
+
+
 WindowPaintData::WindowPaintData()
     : opacity( 1.0 )
     , contents_opacity( 1.0 )
diff --git a/lib/kwineffects.h b/lib/kwineffects.h
index 91e7b0e5aa..85b0b7dcd4 100644
--- a/lib/kwineffects.h
+++ b/lib/kwineffects.h
@@ -434,10 +434,14 @@ class KWIN_EXPORT WindowPrePaintData
         QRegion clip;
         WindowQuadList quads;
         /**
-         * Simple helper than sets data to say the window will be painted as non-opaque.
+         * Simple helper that sets data to say the window will be painted as non-opaque.
          * Takes also care of changing the regions.
          */
         void setTranslucent();
+        /**
+         * Helper to mark that this window will be transformed
+         **/
+        void setTransformed();
     };
 
 class KWIN_EXPORT WindowPaintData