still buggy but less buggy than before, more caching and less overhead

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15160 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/servers/app/newerClipping/ClientLooper.cpp

@@ -38,7 +38,7 @@ ClientLooper::MessageReceived(BMessage* message)
 
 			for (int32 i = 0; i < fViewCount; i++) {
 				// the client is slow
-				snooze(1000L);
+//				snooze(20000L);
 				// send the command to redraw a view
 				BMessage command(MSG_DRAWING_COMMAND);
 				command.AddInt32("token", i);

src/tests/servers/app/newerClipping/ViewLayer.cpp

@@ -116,7 +116,19 @@ ViewLayer::AddChild(ViewLayer* layer)
 
 	if (fWindow) {
 		layer->AttachedToWindow(fWindow);
-		fWindow->MarkDirty(&layer->ScreenClipping());
+
+		// TODO: not correct... need something like
+		// ViewLayer::ClipToParent(BRect frame)
+		// {
+		//     	frame = frame & Bounds();
+		//      ConvertToParent(&frame);
+		//      fParent->ClipToParent(&frame);
+		// }
+		BRect dirty(layer->Frame());
+		dirty = dirty & Bounds();
+		ConvertToTop(&dirty);
+		BRegion dirtyRegion(dirty);
+		fWindow->MarkContentDirty(&dirtyRegion);
 	}
 }
 
@@ -155,6 +167,7 @@ ViewLayer::RemoveChild(ViewLayer* layer)
 	}
 	if (fWindow) {
 		layer->DetachedFromWindow();
+		// TODO: handle exposed area
 	}
 
 	return true;
@@ -290,16 +303,14 @@ ViewLayer::SetName(const char* string)
 	fName.SetTo(string);
 }
 
-#define HW_MOVE 0
-
+#if 0
 // MoveBy
 void
-ViewLayer::MoveBy(int32 x, int32 y)
+ViewLayer::MoveBy(int32 x, int32 y, BRegion* dirtyRegion)
 {
 	if (x == 0 && y == 0)
 		return;
 
-#if HW_MOVE
 	if (!fIsTopLayer && fWindow) {
 		// blit to new location (children as well)
 		BRect screenRect;
@@ -355,21 +366,46 @@ if (fParent) {
 		fFrame.OffsetBy(x, y);
 		_MoveScreenClipping(x, y, true);
 	}
-#else // HW_MOVE
 	fFrame.OffsetBy(x, y);
-
-	_MoveScreenClipping(x, y, true);
-
-	if (!fIsTopLayer && fWindow) {
-		BRect screenRect(Bounds());
-		ConvertToTop(&screenRect);
-		screenRect = screenRect | screenRect.OffsetByCopy(-x, -y);
-		BRegion dirty(screenRect);
-
-		fWindow->MarkDirty(&dirty);
-	}
-#endif // !HW_MOVE
 }
+#else // 0
+
+// MoveBy
+void
+ViewLayer::MoveBy(int32 x, int32 y, BRegion* dirtyRegion)
+{
+	if (x == 0 && y == 0)
+		return;
+
+	fFrame.OffsetBy(x, y);
+	InvalidateScreenClipping(true);
+
+	if (!fIsTopLayer && dirtyRegion) {
+		if (fParent) {
+			// clip to parent
+			BRect oldScreenRect(Bounds());
+			oldScreenRect.OffsetByCopy(-x, -y);
+			ConvertToParent(&oldScreenRect);
+
+			BRect screenRect(Bounds());
+			ConvertToParent(&screenRect);
+
+			// TODO: see AddLayer
+			BRect dirty = oldScreenRect | screenRect;
+			dirty = dirty & fParent->Bounds();
+			fParent->ConvertToTop(&dirty);
+			
+			dirtyRegion->Include(dirty);
+		} else {
+			BRect screenRect(Bounds());
+			screenRect = screenRect | screenRect.OffsetByCopy(-x, -y);
+			ConvertToTop(&screenRect);
+
+			dirtyRegion->Include(screenRect);
+		}
+	}
+}
+#endif // 0
 
 // ResizeBy
 void
@@ -391,7 +427,7 @@ ViewLayer::ResizeBy(int32 x, int32 y, BRegion* dirtyRegion)
 		dirty.Exclude(oldBounds & Bounds());
 	}
 
-	_InvalidateScreenClipping(true);
+	InvalidateScreenClipping(true);
 
 	if (dirty.CountRects() > 0) {
 		// exclude children, they are expected to
@@ -418,14 +454,14 @@ ViewLayer::ResizeBy(int32 x, int32 y, BRegion* dirtyRegion)
 
 // ScrollBy
 void
-ViewLayer::ScrollBy(int32 x, int32 y)
+ViewLayer::ScrollBy(int32 x, int32 y, BRegion* dirtyRegion)
 {
 	fScrollingOffset.x += x;
 	fScrollingOffset.y += y;
 	// TODO: CopyRegion...
 	// TODO: ...
 
-	_InvalidateScreenClipping(true);
+	InvalidateScreenClipping(true);
 }
 
 // ParentResized
@@ -463,7 +499,7 @@ ViewLayer::ParentResized(int32 x, int32 y, BRegion* dirtyRegion)
 		// MoveBy will change fFrame, so cache it
 		BRect oldFrame = fFrame;
 		MoveBy(newFrame.left - oldFrame.left,
-			   newFrame.top - oldFrame.top);
+			   newFrame.top - oldFrame.top, dirtyRegion);
 
 		ResizeBy(newFrame.Width() - oldFrame.Width(),
 				 newFrame.Height() - oldFrame.Height(), dirtyRegion);
@@ -472,10 +508,11 @@ ViewLayer::ParentResized(int32 x, int32 y, BRegion* dirtyRegion)
 
 // Draw
 void
-ViewLayer::Draw(DrawingEngine* drawingEngine, BRegion* effectiveClipping, bool deep)
+ViewLayer::Draw(DrawingEngine* drawingEngine, BRegion* effectiveClipping,
+				BRegion* windowContentClipping,bool deep)
 {
 	// we can only draw within our own area
-	BRegion redraw(ScreenClipping());
+	BRegion redraw(ScreenClipping(windowContentClipping));
 	// add the current clipping
 	redraw.IntersectWith(effectiveClipping);
 
@@ -494,10 +531,11 @@ ViewLayer::Draw(DrawingEngine* drawingEngine, BRegion* effectiveClipping, bool d
 	if (deep) {
 		// before passing the clipping on to children, exclude our
 		// own region from the available clipping
-		effectiveClipping->Exclude(&ScreenClipping());
+		effectiveClipping->Exclude(&ScreenClipping(windowContentClipping));
 
 		for (ViewLayer* child = FirstChild(); child; child = NextChild()) {
-			child->Draw(drawingEngine, effectiveClipping, deep);
+			child->Draw(drawingEngine, effectiveClipping,
+						windowContentClipping, deep);
 		}
 	}
 }
@@ -587,25 +625,26 @@ ViewLayer::RebuildClipping(bool deep)
 
 // ScreenClipping
 BRegion&
-ViewLayer::ScreenClipping() const
+ViewLayer::ScreenClipping(BRegion* windowContentClipping, bool force) const
 {
-	if (!fScreenClippingValid) {
+	if (!fScreenClippingValid || force) {
 		fScreenClipping = fLocalClipping;
 		ConvertToTop(&fScreenClipping);
+		fScreenClipping.IntersectWith(windowContentClipping);
 		fScreenClippingValid = true;
 	}
 	return fScreenClipping;
 }
 
-// _InvalidateScreenClipping
+// InvalidateScreenClipping
 void
-ViewLayer::_InvalidateScreenClipping(bool deep)
+ViewLayer::InvalidateScreenClipping(bool deep)
 {
 	fScreenClippingValid = false;
 	if (deep) {
 		// invalidate the childrens screen clipping as well
 		for (ViewLayer* child = FirstChild(); child; child = NextChild()) {
-			child->_InvalidateScreenClipping(deep);
+			child->InvalidateScreenClipping(deep);
 		}
 	}
 }
@@ -618,7 +657,7 @@ ViewLayer::_MoveScreenClipping(int32 x, int32 y, bool deep)
 		fScreenClipping.OffsetBy(x, y);
 
 	if (deep) {
-		// invalidate the childrens screen clipping as well
+		// move the childrens screen clipping as well
 		for (ViewLayer* child = FirstChild(); child; child = NextChild()) {
 			child->_MoveScreenClipping(x, y, deep);
 		}

src/tests/servers/app/newerClipping/ViewLayer.h

@@ -62,21 +62,27 @@ class ViewLayer {
 	inline	const char*		Name() const
 								{ return fName.String(); }
 
-			void			MoveBy(int32 dx, int32 dy);
-			void			ResizeBy(int32 dx, int32 dy, BRegion* dirtyRegion);
-			void			ScrollBy(int32 dx, int32 dy);
+			void			MoveBy(			int32 dx, int32 dy,
+											BRegion* dirtyRegion);
 
-			void			ParentResized(int32 dx, int32 dy,
-										  BRegion* dirtyRegion);
+			void			ResizeBy(		int32 dx, int32 dy,
+											BRegion* dirtyRegion);
+
+			void			ScrollBy(		int32 dx, int32 dy,
+											BRegion* dirtyRegion);
+
+			void			ParentResized(	int32 dx, int32 dy,
+											BRegion* dirtyRegion);
 
 			// for background clearing
-			void			Draw(DrawingEngine* drawingEngine,
-								 BRegion* effectiveClipping,
-								 bool deep = false);
+			void			Draw(			DrawingEngine* drawingEngine,
+											BRegion* effectiveClipping,
+											BRegion* windowContentClipping,
+											bool deep = false);
 
-			// to simulate drawing done from client side
-			void			ClientDraw(DrawingEngine* drawingEngine,
-									   BRegion* effectiveClipping);
+			// to simulate drawing triggered from client side
+			void			ClientDraw(		DrawingEngine* drawingEngine,
+											BRegion* effectiveClipping);
 
 			bool			IsHidden() const;
 			void			Hide();
@@ -84,13 +90,15 @@ class ViewLayer {
 
 			// clipping
 			void			RebuildClipping(bool deep);
-			BRegion&		ScreenClipping() const;
+			BRegion&		ScreenClipping(BRegion* windowContentClipping,
+										   bool force = false) const;
 
 			// debugging
 			void			PrintToStream() const;
 
+			void			InvalidateScreenClipping(bool deep);
+
 private:
-			void			_InvalidateScreenClipping(bool deep);
 			void			_MoveScreenClipping(int32 x, int32 y,
 												bool deep);
 

src/tests/servers/app/newerClipping/WindowLayer.cpp

@@ -18,12 +18,16 @@ WindowLayer::WindowLayer(BRect frame, const char* name,
 						 DrawingEngine* drawingEngine, Desktop* desktop)
 	: BLooper(name),
 	  fFrame(frame),
+
 	  fVisibleRegion(),
+	  fVisibleContentRegion(),
 
 	  fBorderRegion(),
 	  fBorderRegionValid(false),
 	  fContentRegion(),
 	  fContentRegionValid(false),
+	  fEffectiveDrawingRegion(),
+	  fEffectiveDrawingRegionValid(false),
 
 	  fFocus(false),
 
@@ -103,10 +107,18 @@ WindowLayer::MessageReceived(BMessage* message)
 void
 WindowLayer::SetClipping(BRegion* stillAvailableOnScreen)
 {
+	// this function is only called from the Desktop thread
+
 	// start from full region (as if the window was fully visible)
 	GetFullRegion(&fVisibleRegion);
 	// clip to region still available on screen
 	fVisibleRegion.IntersectWith(stillAvailableOnScreen);
+
+	GetContentRegion(&fVisibleContentRegion);
+	fVisibleContentRegion.IntersectWith(&fVisibleRegion);
+
+	fEffectiveDrawingRegionValid = false;
+	fTopLayer->InvalidateScreenClipping(true);
 }
 
 // GetFullRegion
@@ -123,45 +135,48 @@ WindowLayer::GetFullRegion(BRegion* region) const
 
 // GetBorderRegion
 void
-WindowLayer::GetBorderRegion(BRegion* region) const
+WindowLayer::GetBorderRegion(BRegion* region)
 {
-	if (fBorderRegionValid) {
-		*region = fBorderRegion;
+	if (!fBorderRegionValid) {
+		// TODO: speed up by avoiding "Exclude()"
+		// start from the frame, extend to include decorator border
+		fBorderRegion.Set(BRect(fFrame.left - 4, fFrame.top - 4,
+						  fFrame.right + 4, fFrame.bottom + 4));
+	
+		fBorderRegion.Exclude(fFrame);
+	
+		// add the title tab
+		fBorderRegion.Include(BRect(fFrame.left - 4, fFrame.top - 20,
+							  (fFrame.left + fFrame.right) / 2, fFrame.top - 5));
+	
+		// resize handle
+		// if (B_DOCUMENT_WINDOW_LOOK)
+			fBorderRegion.Include(BRect(fFrame.right - 10, fFrame.bottom - 10,
+								  fFrame.right, fFrame.bottom));
+		fBorderRegionValid = true;
 	}
 
-	// TODO: speed up by avoiding "Exclude()"
-	// start from the frame, extend to include decorator border
-	region->Set(BRect(fFrame.left - 4, fFrame.top - 4,
-					  fFrame.right + 4, fFrame.bottom + 4));
-
-	region->Exclude(fFrame);
-
-	// add the title tab
-	region->Include(BRect(fFrame.left - 4, fFrame.top - 20,
-						  (fFrame.left + fFrame.right) / 2, fFrame.top - 5));
-
-	// resize handle
-	// if (B_DOCUMENT_WINDOW_LOOK)
-		region->Include(BRect(fFrame.right - 10, fFrame.bottom - 10,
-							  fFrame.right, fFrame.bottom));
+	*region = fBorderRegion;
 }
 
 // GetContentRegion
 void
-WindowLayer::GetContentRegion(BRegion* region) const
+WindowLayer::GetContentRegion(BRegion* region)
 {
-	if (fContentRegionValid) {
-		*region = fContentRegion;
+	if (!fContentRegionValid) {
+		// TODO: speed up by avoiding "Exclude()"
+		// start from the frame, extend to include decorator border
+		fContentRegion.Set(fFrame);
+	
+		// resize handle
+		// if (B_DOCUMENT_WINDOW_LOOK)
+			fContentRegion.Exclude(BRect(fFrame.right - 10, fFrame.bottom - 10,
+								   fFrame.right, fFrame.bottom));
+
+		fContentRegionValid = true;
 	}
 
-	// TODO: speed up by avoiding "Exclude()"
-	// start from the frame, extend to include decorator border
-	region->Set(fFrame);
-
-	// resize handle
-	// if (B_DOCUMENT_WINDOW_LOOK)
-		region->Exclude(BRect(fFrame.right - 10, fFrame.bottom - 10,
-							  fFrame.right, fFrame.bottom));
+	*region = fContentRegion;
 }
 
 // SetFocus
@@ -189,6 +204,8 @@ WindowLayer::SetFocus(bool focus)
 void
 WindowLayer::MoveBy(int32 x, int32 y)
 {
+	// this function is only called from the desktop thread
+
 	if (x == 0 && y == 0)
 		return;
 
@@ -204,9 +221,11 @@ WindowLayer::MoveBy(int32 x, int32 y)
 	if (fPendingUpdateSession)
 		fPendingUpdateSession->MoveBy(x, y);
 
-	fTopLayer->MoveBy(x, y);
+	fEffectiveDrawingRegionValid = false;
 
-	// TODO: move a local dirty region!
+	fTopLayer->MoveBy(x, y, NULL);
+
+	// the desktop will take care of dirty regions
 }
 
 // ResizeBy
@@ -219,18 +238,21 @@ WindowLayer::ResizeBy(int32 x, int32 y, BRegion* dirtyRegion)
 	fFrame.right += x;
 	fFrame.bottom += y;
 
+	// put the previous border region into the dirty region as well
+	// to handle the part that was overlapping a layer
+	dirtyRegion->Include(&fBorderRegion);
+
 	fBorderRegionValid = false;
 	fContentRegionValid = false;
+	fEffectiveDrawingRegionValid = false;
 
 	// the border is dirty, put it into
 	// dirtyRegion for a start
-	GetBorderRegion(dirtyRegion);
-
-	// put the previous border region into the dirty region as well
-	// to handle the part that was overlapping a layer
-//	if B_DOCUMENT_WINDOW_LOOK
-		dirtyRegion->Include(&fBorderRegion);
+	BRegion newBorderRegion;
+	GetBorderRegion(&newBorderRegion);
+	dirtyRegion->Include(&newBorderRegion);
 
+	// TODO: should this be clipped to the content region?
 	fTopLayer->ResizeBy(x, y, dirtyRegion);
 }
 
@@ -259,6 +281,19 @@ WindowLayer::MarkDirty(BRegion* regionOnScreen)
 		fDesktop->MarkDirty(regionOnScreen);
 }
 
+// MarkDirty
+void
+WindowLayer::MarkContentDirty(BRegion* regionOnScreen)
+{
+	if (fDesktop && fDesktop->LockClipping()) {
+
+		regionOnScreen->IntersectWith(&fVisibleContentRegion);
+		fDesktop->MarkDirty(regionOnScreen);
+
+		fDesktop->UnlockClipping();
+	}
+}
+/*
 // DirtyRegion
 BRegion
 WindowLayer::DirtyRegion()
@@ -270,7 +305,7 @@ WindowLayer::DirtyRegion()
 	}
 	return dirty;
 }
-
+*/
 # pragma mark -
 
 // _DrawContents
@@ -285,30 +320,23 @@ WindowLayer::_DrawContents(ViewLayer* layer)
 	if (!layer)
 		layer = fTopLayer;
 
-	if (!fContentRegionValid) {
-		GetContentRegion(&fContentRegion);
-		fContentRegionValid = true;
+	if (fDesktop->ReadLockClipping()) {
+	
+		BRegion effectiveWindowClipping(fVisibleContentRegion);
+		effectiveWindowClipping.IntersectWith(fDesktop->DirtyRegion());
+
+		if (effectiveWindowClipping.Frame().IsValid()) {
+			// send UPDATE message to the client
+			_MarkContentDirty(&effectiveWindowClipping);
+	
+			layer->Draw(fDrawingEngine, &effectiveWindowClipping,
+						&fVisibleContentRegion, true);
+	
+			fDesktop->MarkClean(&fContentRegion);
+		}
+
+		fDesktop->ReadUnlockClipping();
 	}
-
-	BRegion effectiveWindowClipping(fContentRegion);
-	// TODO: simplify
-	// ideally, there would only be a local fDirtyRegion,
-	// that we need to intersect with. fDirtyRegion would
-	// already only include fVisibleRegion
-	effectiveWindowClipping.IntersectWith(&fVisibleRegion);
-	effectiveWindowClipping.IntersectWith(fDesktop->DirtyRegion());
-	if (effectiveWindowClipping.Frame().IsValid()) {
-		// send UPDATE message to the client here
-		_MarkContentDirty(&effectiveWindowClipping);
-
-		layer->Draw(fDrawingEngine, &effectiveWindowClipping, true);
-
-		fDesktop->MarkClean(&fContentRegion);
-	}
-//else {
-//printf("  nothing to do\n");
-//}
-
 }
 
 // _DrawClient
@@ -319,22 +347,25 @@ WindowLayer::_DrawClient(int32 token)
 	if (!layer)
 		return;
 
-	BRegion effectiveClipping(layer->ScreenClipping());
-	if (fInUpdate) {
-		// enforce the dirty region of the update session
-		effectiveClipping.IntersectWith(&fCurrentUpdateSession->DirtyRegion());
-	} else {
-printf("%s - _DrawClient(token: %ld) - not in update\n", Name(), token);
-	}
+	if (fDesktop->ReadLockClipping()) {
 
-	if (effectiveClipping.CountRects() > 0 && fDesktop->ReadLockClipping()) {
-		effectiveClipping.IntersectWith(&fVisibleRegion);
-		// TODO: This step seems too much
-		BRegion contentRegion;
-		GetContentRegion(&contentRegion);
-		effectiveClipping.IntersectWith(&contentRegion);
+		if (!fEffectiveDrawingRegionValid) {
+			fEffectiveDrawingRegion = fVisibleContentRegion;
+			if (fInUpdate) {
+				// enforce the dirty region of the update session
+				fEffectiveDrawingRegion.IntersectWith(&fCurrentUpdateSession->DirtyRegion());
+			} else {
+				printf("%s - _DrawClient(token: %ld) - not in update\n", Name(), token);
+			}
+			fEffectiveDrawingRegionValid = true;
+		}
 
-		layer->ClientDraw(fDrawingEngine, &effectiveClipping);
+		BRegion effectiveClipping(fEffectiveDrawingRegion);
+		effectiveClipping.IntersectWith(&layer->ScreenClipping(&fVisibleContentRegion));
+		
+		if (effectiveClipping.CountRects() > 0) {
+			layer->ClientDraw(fDrawingEngine, &effectiveClipping);
+		}
 
 		fDesktop->ReadUnlockClipping();
 	}
@@ -348,34 +379,31 @@ WindowLayer::_DrawBorder()
 #if SLOW_DRAWING
 	snooze(10000);
 #endif
-
-	if (!fBorderRegionValid) {
-		GetBorderRegion(&fBorderRegion);
-		fBorderRegionValid = true;
-	}
-
-	// construct the region of the border that needs redrawing
-	BRegion dirtyBorderRegion(fBorderRegion);
-	// intersect with our visible region
-	dirtyBorderRegion.IntersectWith(&fVisibleRegion);
-	// intersect with the Desktop's dirty region
-	dirtyBorderRegion.IntersectWith(fDesktop->DirtyRegion());
-
-	if (dirtyBorderRegion.Frame().IsValid()) {
-		if (fDrawingEngine->Lock()) {
-			if (fFocus)
-				fDrawingEngine->SetHighColor(255, 203, 0, 255);
-			else
-				fDrawingEngine->SetHighColor(216, 216, 216, 0);
-			fDrawingEngine->FillRegion(&dirtyBorderRegion);
-			fDrawingEngine->MarkDirty(&dirtyBorderRegion);
-			fDrawingEngine->Unlock();
+	if (fDesktop->ReadLockClipping()) {
+	
+		// construct the region of the border that needs redrawing
+		BRegion dirtyBorderRegion;
+		GetBorderRegion(&dirtyBorderRegion);
+		// intersect with our visible region
+		dirtyBorderRegion.IntersectWith(&fVisibleRegion);
+		// intersect with the Desktop's dirty region
+		dirtyBorderRegion.IntersectWith(fDesktop->DirtyRegion());
+	
+		if (dirtyBorderRegion.Frame().IsValid()) {
+			if (fDrawingEngine->Lock()) {
+				if (fFocus)
+					fDrawingEngine->SetHighColor(255, 203, 0, 255);
+				else
+					fDrawingEngine->SetHighColor(216, 216, 216, 0);
+				fDrawingEngine->FillRegion(&dirtyBorderRegion);
+				fDrawingEngine->MarkDirty(&dirtyBorderRegion);
+				fDrawingEngine->Unlock();
+			}
+			fDesktop->MarkClean(&dirtyBorderRegion);
 		}
-		fDesktop->MarkClean(&dirtyBorderRegion);
+
+		fDesktop->ReadUnlockClipping();
 	}
-//else {
-//printf("  nothing to do\n");
-//}
 }
 
 // _MarkContentDirty

src/tests/servers/app/newerClipping/WindowLayer.h

@@ -52,8 +52,8 @@ class WindowLayer : public BLooper {
 	inline	BRegion&				VisibleRegion()
 										{ return fVisibleRegion; }
 			void					GetFullRegion(BRegion* region) const;
-			void					GetBorderRegion(BRegion* region) const;
-			void					GetContentRegion(BRegion* region) const;
+			void					GetBorderRegion(BRegion* region);
+			void					GetContentRegion(BRegion* region);
 
 			void					SetFocus(bool focus);
 
@@ -63,11 +63,12 @@ class WindowLayer : public BLooper {
 			void					AddChild(ViewLayer* layer);
 
 			void					MarkDirty(BRegion* regionOnScreen);
+			void					MarkContentDirty(BRegion* regionOnScreen);
 
 			DrawingEngine*			GetDrawingEngine() const
 										{ return fDrawingEngine; }
 
-			BRegion					DirtyRegion();
+//			BRegion					DirtyRegion();
 
  private:
 			void					_DrawContents(ViewLayer* layer = NULL);
@@ -84,12 +85,15 @@ class WindowLayer : public BLooper {
 			// Desktop thread, when using it, Desktop::LockClipping()
 			// has to be called
 			BRegion					fVisibleRegion;
+			BRegion					fVisibleContentRegion;
 
 			// caching local regions
 			BRegion					fBorderRegion;
 			bool					fBorderRegionValid;
 			BRegion					fContentRegion;
 			bool					fContentRegionValid;
+			BRegion					fEffectiveDrawingRegion;
+			bool					fEffectiveDrawingRegionValid;
 
 			bool					fFocus;