No longer invalidates the view when an overlay bitmap is updated.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17319 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/ServerWindow.cpp

@@ -1514,13 +1514,23 @@ ServerWindow::_DispatchViewMessage(int32 code,
 			if (status == B_OK) {
 				ServerBitmap* bitmap = fServerApp->FindBitmap(bitmapToken);
 				if (bitmapToken == -1 || bitmap != NULL) {
+					bool wasOverlay = fCurrentLayer->ViewBitmap() != NULL
+						&& fCurrentLayer->ViewBitmap()->Overlay() != NULL;
+
 					// TODO: this is a race condition: the bitmap could have been
 					//	deleted in the mean time!!
 					fCurrentLayer->SetViewBitmap(bitmap, srcRect, dstRect,
 						resizingMode, options);
 
+					// TODO: if we revert the view color overlay handling
+					//	in ViewLayer::Draw() to the R5 version, we never
+					//	need to invalidate the view for overlays.
+
+					// invalidate view - but only if this is a non-overlay switch
+					if (bitmap == NULL || bitmap->Overlay() == NULL || !wasOverlay) {
 						BRegion dirty(fCurrentLayer->Bounds());
 						fWindowLayer->InvalidateView(fCurrentLayer, dirty);
+					}
 
 					if (bitmap != NULL && bitmap->Overlay() != NULL)
 						colorKey = bitmap->Overlay()->Color().GetColor32();

src/servers/app/ViewLayer.h

@@ -141,6 +141,9 @@ class ViewLayer {
 								{ return fViewColor; }
 			void			SetViewColor(const RGBColor& color)
 								{ fViewColor = color; }
+
+			ServerBitmap*	ViewBitmap() const
+								{ return fViewBitmap; }
 			void			SetViewBitmap(ServerBitmap* bitmap, BRect sourceRect,
 								BRect destRect, int32 resizingMode, int32 options);