Decouple Canvas from DisplayList and map Picture and PictureRecorder more directly to their Skia co…

sky/examples/game/lib/sprite_box.dart

 part of sprites;
 
 enum SpriteBoxTransformMode {
   nativePoints,
   letterbox,
   stretch,
   scaleToFit,
   fixedWidth,
   fixedHeight,
 }
@@ skipping 212 matching lines @@
     _transformMatrix.scale(scaleX, scaleY);
 
     return _transformMatrix;
   }
 
   void _invalidateTransformMatrix() {
     _transformMatrix = null;
     _rootNode._invalidateToBoxTransformMatrix();
   }
 
-  void paint(RenderObjectDisplayList canvas) {
+  void paint(RenderCanvas canvas) {
     canvas.save();
 
     // Move to correct coordinate space before drawing
     canvas.concat(transformMatrix.storage);
 
     // Draw the sprite tree
     _rootNode._visit(canvas);
 
     canvas.restore();
   }
@@ skipping 72 matching lines @@
   SpriteBoxHitTestEntry(RenderBox target, Point localPosition) : super(target, localPosition);
 }
 
 class SpriteBoxEvent {
   Point boxPosition;
   String type;
   int pointer;
 
   SpriteBoxEvent(this.boxPosition, this.type, this.pointer);
 }