Shortcut for temporarily suspending compositing. Useful when

one wants to run something graphically intensive like a game
or when compositing goes awry and one wants to see the checkbox
that turns it off.
FEATURE: 155581


svn path=/trunk/KDE/kdebase/workspace/; revision=810031

composite.cpp

@@ -87,6 +87,11 @@ void Workspace::setupCompositing()
         kDebug( 1212 ) << "Compositing is turned off in options";
         return;
         }
+    else if( compositingSuspended )
+        {
+        kDebug( 1212 ) << "Compositing is suspended";
+        return;
+        }
     else if( !CompositingPrefs::compositingPossible() )
         {
         kError( 1212 ) << "Compositing is not possible";
@@ -257,6 +262,14 @@ void Workspace::lostCMSelection()
     finishCompositing();
     }
 
+// for the shortcut
+void Workspace::slotToggleCompositing()
+    {
+    compositingSuspended = !compositingSuspended;
+    finishCompositing();
+    setupCompositing(); // will do nothing if suspended
+    }
+
 void Workspace::addRepaint( int x, int y, int w, int h )
     {
     if( !compositing())

kwinbindings.cpp

@@ -195,6 +195,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 	DEF( I18N_NOOP("Window Screenshot to Clipboard"),     Qt::ALT+Qt::Key_Print, slotGrabWindow() );
 	DEF( I18N_NOOP("Desktop Screenshot to Clipboard"),    Qt::CTRL+Qt::Key_Print, slotGrabDesktop() );
         DEF( I18N_NOOP("Block Global Shortcuts"),           0, slotDisableGlobalShortcuts());
+        DEF( I18N_NOOP("Suspend Compositing"),               Qt::SHIFT+Qt::ALT+Qt::Key_F12, slotToggleCompositing());
 
 #undef DEF
 #undef DEF2

workspace.cpp

@@ -134,6 +134,7 @@ Workspace::Workspace( bool restore )
     block_stacking_updates( 0 ),
     forced_global_mouse_grab( false ),
     cm_selection( NULL ),
+    compositingSuspended( false ),
     compositeRate( 0 ),
     overlay( None ),
     overlay_visible( true ),
@@ -1034,7 +1035,7 @@ void Workspace::slotReconfigure()
         updateCurrentTopMenu();
         }
 
-    if( options->useCompositing )
+    if( options->useCompositing && !compositingSuspended )
     {
         setupCompositing();
         if( effects ) // setupCompositing() may fail

workspace.h

@@ -456,6 +456,7 @@ class Workspace : public QObject, public KDecorationDefines
 
         void slotSetupWindowShortcut();
         void setupWindowShortcutDone( bool );
+        void slotToggleCompositing();
 
         void updateClientArea();
 
@@ -718,6 +719,7 @@ class Workspace : public QObject, public KDecorationDefines
         friend class StackingUpdatesBlocker;
 
         KSelectionOwner* cm_selection;
+        bool compositingSuspended;
         QTimer compositeTimer;
         QTime lastCompositePaint;
         int compositeRate;