libkwineffects: Introduce windowExpandedGeometryChanged()

This signal can be useful if you want to know when the visible geometry
has changed to update cached repaint region during an animation.

src/effects.cpp

@@ -354,6 +354,9 @@ void EffectsHandlerImpl::setupClientConnections(AbstractClient* c)
             emit windowFullScreenChanged(c->effectWindow());
         }
     );
+    connect(c, &AbstractClient::visibleGeometryChanged, this, [this, c]() {
+        emit windowExpandedGeometryChanged(c->effectWindow());
+    });
 }
 
 void EffectsHandlerImpl::setupUnmanagedConnections(Unmanaged* u)
@@ -364,6 +367,9 @@ void EffectsHandlerImpl::setupUnmanagedConnections(Unmanaged* u)
     connect(u, &Unmanaged::frameGeometryChanged, this, &EffectsHandlerImpl::slotFrameGeometryChanged);
     connect(u, &Unmanaged::paddingChanged,       this, &EffectsHandlerImpl::slotPaddingChanged);
     connect(u, &Unmanaged::damaged,              this, &EffectsHandlerImpl::slotWindowDamaged);
+    connect(u, &Unmanaged::visibleGeometryChanged, this, [this, u]() {
+        emit windowExpandedGeometryChanged(u->effectWindow());
+    });
 }
 
 void EffectsHandlerImpl::reconfigure()

src/libkwineffects/kwinanimationeffect.cpp

@@ -213,12 +213,8 @@ quint64 AnimationEffect::p_animate( EffectWindow *w, Attribute a, uint meta, int
     if (!d->m_isInitialized)
         init(); // needs to ensure the window gets removed if deleted in the same event cycle
     if (d->m_animations.isEmpty()) {
-        connect(effects, &EffectsHandler::windowGeometryShapeChanged,
-            this, &AnimationEffect::_expandedGeometryChanged);
-        connect(effects, &EffectsHandler::windowStepUserMovedResized,
-            this, &AnimationEffect::_expandedGeometryChanged);
-        connect(effects, &EffectsHandler::windowPaddingChanged,
-            this, &AnimationEffect::_expandedGeometryChanged);
+        connect(effects, &EffectsHandler::windowExpandedGeometryChanged,
+                this, &AnimationEffect::_windowExpandedGeometryChanged);
     }
     AniMap::iterator it = d->m_animations.find(w);
     if (it == d->m_animations.end())
@@ -555,12 +551,8 @@ void AnimationEffect::clipWindow(const EffectWindow *w, const AniData &anim, Win
 
 void AnimationEffect::disconnectGeometryChanges()
 {
-    disconnect(effects, &EffectsHandler::windowGeometryShapeChanged,
-        this, &AnimationEffect::_expandedGeometryChanged);
-    disconnect(effects, &EffectsHandler::windowStepUserMovedResized,
-        this, &AnimationEffect::_expandedGeometryChanged);
-    disconnect(effects, &EffectsHandler::windowPaddingChanged,
-        this, &AnimationEffect::_expandedGeometryChanged);
+    disconnect(effects, &EffectsHandler::windowExpandedGeometryChanged,
+               this, &AnimationEffect::_windowExpandedGeometryChanged);
 }
 
 
@@ -970,9 +962,8 @@ region_creation:
     d->m_damageDirty = false;
 }
 
-void AnimationEffect::_expandedGeometryChanged(KWin::EffectWindow *w, const QRect &old)
+void AnimationEffect::_windowExpandedGeometryChanged(KWin::EffectWindow *w)
 {
-    Q_UNUSED(old)
     Q_D(AnimationEffect);
     AniMap::const_iterator entry = d->m_animations.constFind(w);
     if (entry != d->m_animations.constEnd()) {

src/libkwineffects/kwinanimationeffect.h

@@ -389,7 +389,7 @@ private Q_SLOTS:
     void triggerRepaint();
     void _windowClosed( KWin::EffectWindow* w );
     void _windowDeleted( KWin::EffectWindow* w );
-    void _expandedGeometryChanged(KWin::EffectWindow *w, const QRect &old);
+    void _windowExpandedGeometryChanged(KWin::EffectWindow *w);
 
 private:
     static QElapsedTimer s_clock;

src/libkwineffects/kwineffects.h

@@ -1845,6 +1845,11 @@ Q_SIGNALS:
      */
     void sessionStateChanged();
 
+    /**
+     * This signal is emitted when the visible geometry of a window changed.
+     */
+    void windowExpandedGeometryChanged(KWin::EffectWindow *window);
+
 protected:
     QVector< EffectPair > loaded_effects;
     //QHash< QString, EffectFactory* > effect_factories;

src/toplevel.cpp

@@ -50,6 +50,10 @@ Toplevel::Toplevel()
     setupCheckScreenConnection();
     connect(this, &Toplevel::bufferGeometryChanged, this, &Toplevel::inputTransformationChanged);
 
+    connect(this, &Toplevel::paddingChanged, this, &Toplevel::visibleGeometryChanged);
+    connect(this, &Toplevel::bufferGeometryChanged, this, &Toplevel::visibleGeometryChanged);
+    connect(this, &Toplevel::frameGeometryChanged, this, &Toplevel::visibleGeometryChanged);
+
     // Only for compatibility reasons, drop in the next major release.
     connect(this, &Toplevel::frameGeometryChanged, this, &Toplevel::geometryChanged);
 }

src/toplevel.h

@@ -665,6 +665,11 @@ Q_SIGNALS:
      */
     void clientGeometryChanged(KWin::Toplevel *toplevel, const QRect &oldGeometry);
 
+    /**
+     * This signal is emitted when the visible geometry has changed.
+     */
+    void visibleGeometryChanged();
+
 protected Q_SLOTS:
     /**
      * Checks whether the screen number for this Toplevel changed and updates if needed.