Added some methods for tiling.

gfx/public/nsRenderingContextImpl.h

@@ -32,9 +32,38 @@ public:
   nsRenderingContextImpl();
 
 
+
+  /** ---------------------------------------------------
+   *  See documentation in nsIRenderingContext.h
+   *	@update 03/29/00 dwc
+   */
+  NS_IMETHOD DrawTile(nsIImage *aImage,nscoord aX0,nscoord aY0,nscoord aX1,nscoord aY1,nscoord aWidth,nscoord aHeight);
+
+
 protected:
   virtual ~nsRenderingContextImpl();
 
+  /** ---------------------------------------------------
+   *  Check to see if the given size of tile can be imaged by the RenderingContext
+   *	@update 03/29/00 dwc
+   *  @param aWidth The width of the tile
+   *  @param aHeight The height of the tile
+   *  @return PR_TRUE the RenderingContext can handle this tile
+   */
+  virtual PRBool CanTile(nscoord aWidth,nscoord aHeight) { return PR_FALSE; }
+
+  
+  /** ---------------------------------------------------
+   *  A bit blitter to tile images to the background recursively
+   *	@update 3/29/00 dwc
+   *  @param aDS -- Target drawing surface for the rendering context
+   *  @param aSrcRect -- Rectangle we are build with the image
+   *  @param aHeight -- height of the tile
+   *  @param aWidth -- width of the tile
+   */
+  void  TileImage(nsDrawingSurface  aDS,nsRect &aSrcRect,PRInt16 aWidth,PRInt16 aHeight);
+
+
 public:
 
 };