Batched implementation of drawLattice() for GPU

src/core/SkLatticeIter.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLatticeIter_DEFINED
 #define SkLatticeIter_DEFINED
 
@@ skipping 17 matching lines @@
 
     static bool Valid(int imageWidth, int imageHeight, const SkIRect& center);
 
     SkLatticeIter(int imageWidth, int imageHeight, const SkIRect& center, const SkRect& dst);
 
     /**
      *  While it returns true, use src/dst to draw the image/bitmap
      */
     bool next(SkRect* src, SkRect* dst);
 
+    /**
+     *  Apply a matrix to the dst points.
+     */
+    void mapDstScaleTranslate(const SkMatrix& matrix);
+
+    /**
+     *  Returns the total number of rects that will be drawn.
+     */
+    int numRects() const {
+        return fNumRects;
+    }
+
 private:
     SkTArray<SkScalar> fSrcX;
     SkTArray<SkScalar> fSrcY;
     SkTArray<SkScalar> fDstX;
     SkTArray<SkScalar> fDstY;
 
-    int fCurrX;
-    int fCurrY;
+    int  fCurrX;
+    int  fCurrY;
     bool fDone;
+    int  fNumRects;
 };
 
 #endif