Got scrolling to work properly

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12722 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/servers/app/newClipping/Layer.cpp

@@ -281,8 +281,7 @@ void Layer::MoveBy(float dx, float dy)
 
 		// offset back and instruct the HW to do the actual copying.
 		oldFullVisible.OffsetBy(-dx, -dy);
-// TODO: HACK this!
+		GetRootLayer()->CopyRegion(&oldFullVisible, dx, dy);
-//		GetDisplayDriver()->CopyRegion(&oldFullVisible, dx, dy);
 
 		// add redrawReg to our RootLayer's redraw region.
 		GetRootLayer()->fRedrawReg.Include(&redrawReg);
@@ -313,16 +312,14 @@ void Layer::ScrollBy(float dx, float dy)
 		// offset old region so that we can start comparing.
 		invalid.OffsetBy(dx, dy);
 
-		// no need to redraw common regions. redraw only what's needed.
-		redrawReg.Exclude(&invalid);
-
 		// compute the common region. we'll use HW acc to copy this to the new location.
 		invalid.IntersectWith(&fFullVisible);
+		GetRootLayer()->CopyRegion(&invalid, -dx, -dy);
 
-		// offset back and instruct the driver to do the actual copying.
+		// common region goes back to its original location. then, by excluding
+		// it from curent fullVisible we'll obtain the region that needs to be redrawn.
 		invalid.OffsetBy(-dx, -dy);
-// TODO: HACK this!
+		redrawReg.Exclude(&invalid);
-//		GetDisplayDriver()->CopyRegion(&invalid, dx, dy);
 
 		GetRootLayer()->fRedrawReg.Include(&redrawReg);
 		GetRootLayer()->RequestRedraw(); // TODO: what if we pass (fParent, startFromTHIS, &redrawReg)?
@@ -337,7 +334,6 @@ void Layer::set_user_regions(BRegion &reg)
 // OPT: maybe we should have all these cached in a 'fFull' member
 
 	// 1) set to frame in screen coords
-//	BRect			screenFrame(fFrame);
 	BRect			screenFrame(Bounds());
 	ConvertToScreen2(&screenFrame);
 	reg.Set(screenFrame);

src/tests/servers/app/newClipping/MyView.cpp

@@ -20,8 +20,8 @@ MyView::MyView(BRect frame, const char *name, uint32 resizingMode, uint32 flags)
 	topLayer = new Layer(Bounds(), "topLayer", B_FOLLOW_ALL, col);
 	topLayer->SetRootLayer(this);
 
-//	topLayer->RebuildVisibleRegions(BRegion(Bounds()), NULL);
 	topLayer->rebuild_visible_regions(BRegion(Bounds()), BRegion(Bounds()), NULL);
+	fRedrawReg.Set(Bounds());
 }
 
 MyView::~MyView()
@@ -48,9 +48,20 @@ Layer* MyView::FindLayer(Layer *lay, const char *bytes) const
 	return NULL;
 }
 
+void MyView::CopyRegion(BRegion *reg, float dx, float dy)
+{
+wind->Lock();
+//	ConstrainClippingRegion(&r);
+//	CopyBits(Bounds(), Bounds().OffsetByCopy(dx, dy));
+	// TODO: properly do that!
+	// LAME, I know!
+	CopyBits(reg->Frame(), reg->Frame().OffsetByCopy(dx, dy));
+//	ConstrainClippingRegion(NULL);
+wind->Unlock();
+}
+
 void MyView::RequestRedraw()
 {
-	// TODO: implement
 	wind->Lock();
 	Invalidate();
 	wind->Unlock();
@@ -58,14 +69,19 @@ void MyView::RequestRedraw()
 
 void MyView::Draw(BRect area)
 {
+	ConstrainClippingRegion(&fRedrawReg);
+	PushState();
 	DrawSubTree(topLayer);
+	PopState();
+	ConstrainClippingRegion(NULL);
+	fRedrawReg.MakeEmpty();
 }
 
 void MyView::DrawSubTree(Layer* lay)
 {
-printf("======== %s =======\n", lay->Name());
+//printf("======== %s =======\n", lay->Name());
-	lay->Visible()->PrintToStream();
+//	lay->Visible()->PrintToStream();
-	lay->FullVisible()->PrintToStream();
+//	lay->FullVisible()->PrintToStream();
 	Layer *child = lay->VirtualBottomChild();
 	while(child)
 	{

src/tests/servers/app/newClipping/MyView.h

@@ -12,6 +12,7 @@ public:
 
 	virtual	void		Draw(BRect area);
 
+			void		CopyRegion(BRegion *reg, float dx, float dy);
 			void		RequestRedraw();			
 
 			Layer*		FindLayer(Layer *lay, const char *bytes) const;