fixes origin and scale handling, it behaves mostly like R5 now (it is used for drawing only, yes not mouse coords or anything else). Also fixes offscreen layers clipping rebuilding when the user defined clipping is added or changed

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15040 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/servers/app/DrawState.h

@@ -59,6 +59,16 @@ class DrawState {
 		float				Scale() const
 								{ return fScale; }
 
+							// coordinate transformations
+				void		Transform(float* x, float* y) const;
+				void		InverseTransform(float* x, float* y) const;
+
+				void		Transform(BPoint* point) const;
+				void		Transform(BRect* rect) const;
+				void		Transform(BRegion* region) const;
+
+				void		InverseTransform(BPoint* point) const;
+
 							// additional clipping as requested by client
 		void				SetClippingRegion(const BRegion& region);
 		const BRegion*		ClippingRegion() const
@@ -124,8 +134,6 @@ class DrawState {
 								{ return fMiterLimit; }
 
 							// convenience functions
-		inline BPoint		Transform(const BPoint& point) const;
-		inline BRect		Transform(const BRect& rect) const;
 		void				PrintToStream() const;
 
 		void				SetSubPixelPrecise(bool precise);
@@ -177,24 +185,6 @@ class DrawState {
 
 // inline implementations
 
-// Transform
-BPoint
-DrawState::Transform(const BPoint& point) const
-{
-	BPoint p(point);
-	p += fOrigin;
-	p.x *= fScale;
-	p.y *= fScale;
-	return p;
-}
-
-// Transform
-BRect
-DrawState::Transform(const BRect& rect) const
-{
-	return BRect(Transform(rect.LeftTop()),
-				 Transform(rect.LeftBottom()));
-}
 /*
 // ClippingRectAt
 BRect