SkCanvas interface for drawing a patch.

include/core/SkPatch.h

Index: include/core/SkPatch.h
diff --git a/include/core/SkPatch.h b/include/core/SkPatch.h
index 2354423aba21f8004fac0c66649d22a37f49aa20..9efbee939a6e438033caf5d6b5e0fbf91b6cc7a7 100644
--- a/include/core/SkPatch.h
+++ b/include/core/SkPatch.h
@@ -83,39 +83,49 @@ public:
     /**
      * Function that evaluates the coons patch interpolation.
      * data refers to the pointer of the PatchData struct in which the tessellation data is set.
-     * divisions defines the number of steps in which the SkPatch is going to be subdivided per
-     * axis.
+     * lod refers the level of detail for each axis.
      */
-    bool getVertexData(SkPatch::VertexData* data, int divisions);
+    bool getVertexData(SkPatch::VertexData* data, int lodX, int lodY) const;
 
-    void getTopPoints(SkPoint points[4]) {
+    void getTopPoints(SkPoint points[4]) const {
         points[0] = fCtrlPoints[kTopP0_CubicCtrlPts];
         points[1] = fCtrlPoints[kTopP1_CubicCtrlPts];
         points[2] = fCtrlPoints[kTopP2_CubicCtrlPts];
         points[3] = fCtrlPoints[kTopP3_CubicCtrlPts];
     }
     
-    void getBottomPoints(SkPoint points[4]) {
+    void getBottomPoints(SkPoint points[4]) const {
         points[0] = fCtrlPoints[kBottomP0_CubicCtrlPts];
         points[1] = fCtrlPoints[kBottomP1_CubicCtrlPts];
         points[2] = fCtrlPoints[kBottomP2_CubicCtrlPts];
         points[3] = fCtrlPoints[kBottomP3_CubicCtrlPts];
     }
 
-    void getLeftPoints(SkPoint points[4]) {
+    void getLeftPoints(SkPoint points[4]) const {
         points[0] = fCtrlPoints[kLeftP0_CubicCtrlPts];
         points[1] = fCtrlPoints[kLeftP1_CubicCtrlPts];
         points[2] = fCtrlPoints[kLeftP2_CubicCtrlPts];
         points[3] = fCtrlPoints[kLeftP3_CubicCtrlPts];
     }
 
-    void getRightPoints(SkPoint points[4]) {
+    void getRightPoints(SkPoint points[4]) const {
         points[0] = fCtrlPoints[kRightP0_CubicCtrlPts];
         points[1] = fCtrlPoints[kRightP1_CubicCtrlPts];
         points[2] = fCtrlPoints[kRightP2_CubicCtrlPts];
         points[3] = fCtrlPoints[kRightP3_CubicCtrlPts];
     }
     
+    void getCornerPoints(SkPoint points[4]) const {
+        points[0] = fCtrlPoints[kTopP0_CubicCtrlPts];
+        points[1] = fCtrlPoints[kTopP3_CubicCtrlPts];
+        points[2] = fCtrlPoints[kBottomP0_CubicCtrlPts];
+        points[3] = fCtrlPoints[kBottomP3_CubicCtrlPts];
+    }
+    
+    const SkPoint* getControlPoints() const {
+        return fCtrlPoints;
+    }
+    
 private:
     SkPoint fCtrlPoints[12];
     SkPMColor fCornerColors[4];