Add post-painting pass to be used for triggering

repaints with animations.


svn path=/branches/work/kwin_composite/; revision=600156

COMPOSITE_TODO

@@ -115,8 +115,6 @@ TODO:
             be created, but the old animation should be stopped - compare window id's?
     ? maybe just keep the object around in a special list
 
-* add a postpaint pass
-    - needed for animations to trigger next repaint, currently window damage is reset after
-        the painting pass, meaning the damage cannot be added from there
-    - current workaround is to damage the whole screen, as there's a for resetting that damage
-        in advance
+* don't add workspace damage in Toplevel::addDamage()
+    - instead add damage of windows to the screen only before doing the painting
+    - this should prevent repaints because of obscured windows

composite.cpp

@@ -156,13 +156,12 @@ void Workspace::compositeTimeout()
         else if( Unmanaged* c = findUnmanaged( HandleMatchPredicate( children[ i ] )))
             windows.append( c );
         }
-    effects->startPaint();
-    // TODO when effects cause damage, it should be only enqueued for next repaint
-    QRegion r = damage_region;
+    scene->prePaint();
+    scene->paint( damage_region, windows );
     damage_region = QRegion();
-    scene->paint( r, windows );
     foreach( Toplevel* c, windows )
         c->resetDamage();
+    scene->postPaint();
     lastCompositePaint.start();
     }
 

effects.cpp

@@ -46,6 +46,11 @@ void Effect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
     {
     effects->paintScreen( mask, region, data );
     }
+    
+void Effect::postPaintScreen()
+    {
+    effects->postPaintScreen();
+    }
 
 void Effect::prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int time )
     {
@@ -57,6 +62,11 @@ void Effect::paintWindow( Scene::Window* w, int mask, QRegion region, WindowPain
     effects->paintWindow( w, mask, region, data );
     }
 
+void Effect::postPaintWindow( Scene::Window* w )
+    {
+    effects->postPaintWindow( w );
+    }
+
 void MakeHalfTransparent::prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int time )
     {
     const Client* c = dynamic_cast< const Client* >( w->window());
@@ -188,17 +198,9 @@ ShiftWorkspaceUp::ShiftWorkspaceUp( Workspace* ws )
 void ShiftWorkspaceUp::prePaintScreen( int* mask, QRegion* region, int time )
     {
     if( up && diff < 1000 )
-        {
         diff = qBound( 0, diff + time, 1000 ); // KDE3: note this differs from KCLAMP
-        if( diff < 1000 )
-            wspace->addDamageFull(); // affects next redraw
-        }
     if( !up && diff > 0 )
-        {
         diff = qBound( 0, diff - time, 1000 );
-        if( diff > 0 )
-            wspace->addDamageFull(); // affects next redraw
-        }
     if( diff != 0 )
         *mask |= Scene::PAINT_SCREEN_TRANSFORMED;
     effects->prePaintScreen( mask, region, time );
@@ -211,6 +213,13 @@ void ShiftWorkspaceUp::paintScreen( int mask, QRegion region, ScreenPaintData& d
     effects->paintScreen( mask, region, data );
     }
 
+void ShiftWorkspaceUp::postPaintScreen()
+    {
+    if( up ? diff < 1000 : diff > 0 )
+        wspace->addDamageFull(); // trigger next animation repaint
+    effects->postPaintScreen();
+    }
+
 void ShiftWorkspaceUp::tick()
     {
     up = !up;
@@ -227,9 +236,6 @@ void FadeIn::prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int t
             {
             *mask |= Scene::PAINT_WINDOW_TRANSLUCENT;
             *mask &= ~Scene::PAINT_WINDOW_OPAQUE;
-            // TODO this should just damage the window, but right now window
-            // damage is cleared after the painting pass - a postpaint pass is needed
-            w->window()->workspace()->addDamageFull();
             }
         else
             windows.remove( w->window());
@@ -246,6 +252,13 @@ void FadeIn::paintWindow( Scene::Window* w, int mask, QRegion region, WindowPain
     effects->paintWindow( w, mask, region, data );
     }
 
+void FadeIn::postPaintWindow( Scene::Window* w )
+    {
+    if( windows.contains( w->window()))
+        w->window()->addDamageFull(); // trigger next animation repaint
+    effects->postPaintWindow( w );
+    }
+
 void FadeIn::windowAdded( Toplevel* c )
     {
     Client* cc = dynamic_cast< Client* >( c );
@@ -268,12 +281,7 @@ void ScaleIn::prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int
         {
         windows[ w->window() ] += time / 500.; // complete change in 500ms
         if( windows[ w->window() ] < 1 )
-            {
             *mask |= Scene::PAINT_WINDOW_TRANSFORMED;
-            // TODO this should just damage the window, but right now window
-            // damage is cleared after the painting pass - a postpaint pass is needed
-            w->window()->workspace()->addDamageFull();
-            }
         else
             windows.remove( w->window());
         }
@@ -286,12 +294,19 @@ void ScaleIn::paintWindow( Scene::Window* w, int mask, QRegion region, WindowPai
         {
         data.xScale *= windows[ w->window()];
         data.yScale *= windows[ w->window()];
-        data.xTranslate += w->window()->width() / 2 * ( 1 - windows[ w->window()] );
-        data.yTranslate += w->window()->height() / 2 * ( 1 - windows[ w->window()] );
+        data.xTranslate += int( w->window()->width() / 2 * ( 1 - windows[ w->window()] ));
+        data.yTranslate += int( w->window()->height() / 2 * ( 1 - windows[ w->window()] ));
         }
     effects->paintWindow( w, mask, region, data );
     }
 
+void ScaleIn::postPaintWindow( Scene::Window* w )
+    {
+    if( windows.contains( w->window()))
+        w->window()->addDamageFull(); // trigger next animation repaint
+    effects->postPaintWindow( w );
+    }
+
 void ScaleIn::windowAdded( Toplevel* c )
     {
     Client* cc = dynamic_cast< Client* >( c );
@@ -359,7 +374,7 @@ void EffectsHandler::startPaint()
 // the idea is that effects call this function again which calls the next one
 void EffectsHandler::prePaintScreen( int* mask, QRegion* region, int time )
     {
-    if( current_paint_screen < effects.size() - 1 )
+    if( current_paint_screen < effects.size())
         {
         effects[ current_paint_screen++ ]->prePaintScreen( mask, region, time );
         --current_paint_screen;
@@ -369,7 +384,7 @@ void EffectsHandler::prePaintScreen( int* mask, QRegion* region, int time )
 
 void EffectsHandler::paintScreen( int mask, QRegion region, ScreenPaintData& data )
     {
-    if( current_paint_screen < effects.size() - 1 )
+    if( current_paint_screen < effects.size())
         {
         effects[ current_paint_screen++ ]->paintScreen( mask, region, data );
         --current_paint_screen;
@@ -378,9 +393,19 @@ void EffectsHandler::paintScreen( int mask, QRegion region, ScreenPaintData& dat
         scene->finalPaintScreen( mask, region, data );
     }
 
+void EffectsHandler::postPaintScreen()
+    {
+    if( current_paint_screen < effects.size())
+        {
+        effects[ current_paint_screen++ ]->postPaintScreen();
+        --current_paint_screen;
+        }
+    // no special final code
+    }
+
 void EffectsHandler::prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int time )
     {
-    if( current_paint_window < effects.size() - 1 )
+    if( current_paint_window < effects.size())
         {
         effects[ current_paint_window++ ]->prePaintWindow( w, mask, region, time );
         --current_paint_window;
@@ -390,7 +415,7 @@ void EffectsHandler::prePaintWindow( Scene::Window* w, int* mask, QRegion* regio
 
 void EffectsHandler::paintWindow( Scene::Window* w, int mask, QRegion region, WindowPaintData& data )
     {
-    if( current_paint_window < effects.size() - 1 )
+    if( current_paint_window < effects.size())
         {
         effects[ current_paint_window++ ]->paintWindow( w, mask, region, data );
         --current_paint_window;
@@ -399,6 +424,16 @@ void EffectsHandler::paintWindow( Scene::Window* w, int mask, QRegion region, Wi
         scene->finalPaintWindow( w, mask, region, data );
     }
 
+void EffectsHandler::postPaintWindow( Scene::Window* w )
+    {
+    if( current_paint_window < effects.size())
+        {
+        effects[ current_paint_window++ ]->postPaintWindow( w );
+        --current_paint_window;
+        }
+    // no special final code
+    }
+
 EffectsHandler* effects;
 
 } // namespace

effects.h

@@ -50,8 +50,10 @@ class Effect
         virtual ~Effect();
         virtual void prePaintScreen( int* mask, QRegion* region, int time );
         virtual void paintScreen( int mask, QRegion region, ScreenPaintData& data );
+        virtual void postPaintScreen();
         virtual void prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int time );
         virtual void paintWindow( Scene::Window* w, int mask, QRegion region, WindowPaintData& data );
+        virtual void postPaintWindow( Scene::Window* w );
         // called when moved/resized or once after it's finished
         virtual void windowUserMovedResized( Toplevel* c, bool first, bool last );
         virtual void windowAdded( Toplevel* c );
@@ -66,8 +68,10 @@ class EffectsHandler
         // for use by effects
         void prePaintScreen( int* mask, QRegion* region, int time );
         void paintScreen( int mask, QRegion region, ScreenPaintData& data );
+        void postPaintScreen();
         void prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int time );
         void paintWindow( Scene::Window* w, int mask, QRegion region, WindowPaintData& data );
+        void postPaintWindow( Scene::Window* w );
         // internal (used by kwin core or compositing code)
         void startPaint();
         void windowUserMovedResized( Toplevel* c, bool first, bool last );
@@ -126,6 +130,7 @@ class ShiftWorkspaceUp
         ShiftWorkspaceUp( Workspace* ws );
         virtual void prePaintScreen( int* mask, QRegion* region, int time );
         virtual void paintScreen( int mask, QRegion region, ScreenPaintData& data );
+        virtual void postPaintScreen();
     private slots:
         void tick();
     private:
@@ -141,6 +146,7 @@ class FadeIn
     public:
         virtual void prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int time );
         virtual void paintWindow( Scene::Window* w, int mask, QRegion region, WindowPaintData& data );
+        virtual void postPaintWindow( Scene::Window* w );
         // TODO react also on virtual desktop changes
         virtual void windowAdded( Toplevel* c );
         virtual void windowDeleted( Toplevel* c );
@@ -154,6 +160,7 @@ class ScaleIn
     public:
         virtual void prePaintWindow( Scene::Window* w, int* mask, QRegion* region, int time );
         virtual void paintWindow( Scene::Window* w, int mask, QRegion region, WindowPaintData& data );
+        virtual void postPaintWindow( Scene::Window* w );
         // TODO react also on virtual desktop changes
         virtual void windowAdded( Toplevel* c );
         virtual void windowDeleted( Toplevel* c );

scene.cpp

@@ -33,6 +33,12 @@ Scene::~Scene()
     {
     }
 
+void Scene::prePaint()
+    {
+    effects->startPaint();
+    // do the rest of prepaint pass together with paint pass
+    }
+
 // returns mask and possibly modified region
 void Scene::paintScreen( int* mask, QRegion* region )
     {
@@ -148,6 +154,14 @@ void Scene::finalPaintWindow( Scene::Window* w, int mask, QRegion region, Window
     w->performPaint( mask, region, data );
     }
 
+void Scene::postPaint()
+    {
+    effects->postPaintScreen();
+    foreach( Window* w, stacking_order )
+        effects->postPaintWindow( w );
+    stacking_order.clear();
+    }
+
 void Scene::windowGeometryShapeChanged( Toplevel* )
     {
     }

scene.h

@@ -29,8 +29,10 @@ class Scene
         Scene( Workspace* ws );
         virtual ~Scene() = 0;
         class Window;
+        virtual void prePaint();
         // repaints the given screen areas, windows provides the stacking order
         virtual void paint( QRegion damage, ToplevelList windows ) = 0;
+        virtual void postPaint();
         // shape/size of a window changed
         virtual void windowGeometryShapeChanged( Toplevel* );
         // opacity of a window changed
@@ -84,7 +86,7 @@ class Scene::Window
         int y() const;
         int width() const;
         int height() const;
-        const Toplevel* window() const;
+        Toplevel* window();
         bool isVisible() const;
         bool isOpaque() const;
         QRegion shape() const;
@@ -130,7 +132,7 @@ int Scene::Window::height() const
     }
 
 inline
-const Toplevel* Scene::Window::window() const
+Toplevel* Scene::Window::window()
     {
     return toplevel;
     }

scene_opengl.cpp

@@ -279,7 +279,6 @@ void SceneOpenGL::paint( QRegion damage, ToplevelList toplevels )
     glTranslatef( 0, -displayHeight(), 0 );
     int mask = 0;
     paintScreen( &mask, &damage );
-    stacking_order.clear();
     glPopMatrix();
     // TODO only partial repaint for mask & PAINT_SCREEN_REGION
     if( root_db )
@@ -292,7 +291,6 @@ void SceneOpenGL::paint( QRegion damage, ToplevelList toplevels )
         XFlush( display());
         }
     ungrabXServer();
-    checkGLError( "PostPaint" );
     }
 
 void SceneOpenGL::paintGenericScreen( int mask, ScreenPaintData data )
@@ -320,6 +318,12 @@ void SceneOpenGL::paintBackground( QRegion )
 // TODO?
     }
 
+void SceneOpenGL::postPaint()
+    {
+    checkGLError( "PostPaint" );
+    Scene::postPaint();
+    }
+
 void SceneOpenGL::windowAdded( Toplevel* c )
     {
     assert( !windows.contains( c ));

scene_opengl.h

@@ -26,6 +26,7 @@ class SceneOpenGL
         SceneOpenGL( Workspace* ws );
         virtual ~SceneOpenGL();
         virtual void paint( QRegion damage, ToplevelList windows );
+        virtual void postPaint();
         virtual void windowGeometryShapeChanged( Toplevel* );
         virtual void windowOpacityChanged( Toplevel* );
         virtual void windowAdded( Toplevel* );

scene_xrender.cpp

@@ -86,7 +86,6 @@ void SceneXrender::paint( QRegion damage, ToplevelList toplevels )
         }
     int mask = 0;
     paintScreen( &mask, &damage );
-    stacking_order.clear();
     if( mask & PAINT_SCREEN_REGION )
         {
         // Use the damage region as the clip region for the root window