diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/utils/SkBoundaryPatch.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/utils/SkBoundaryPatch.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,66 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkBoundaryPatch_DEFINED
+#define SkBoundaryPatch_DEFINED
+
+#include "SkPoint.h"
+#include "SkRefCnt.h"
+
+class SkBoundary : public SkRefCnt {
+public:
+    SK_DECLARE_INST_COUNT(SkBoundary)
+
+    // These must be 0, 1, 2, 3 for efficiency in the subclass implementations
+    enum Edge {
+        kTop    = 0,
+        kRight  = 1,
+        kBottom = 2,
+        kLeft   = 3
+    };
+    // Edge index goes clockwise around the boundary, beginning at the "top"
+    virtual SkPoint eval(Edge, SkScalar unitInterval) = 0;
+
+private:
+    typedef SkRefCnt INHERITED;
+};
+
+class SkBoundaryPatch {
+public:
+    SkBoundaryPatch();
+    ~SkBoundaryPatch();
+
+    SkBoundary* getBoundary() const { return fBoundary; }
+    SkBoundary* setBoundary(SkBoundary*);
+
+    SkPoint eval(SkScalar unitU, SkScalar unitV);
+    bool evalPatch(SkPoint verts[], int rows, int cols);
+
+private:
+    SkBoundary* fBoundary;
+};
+
+////////////////////////////////////////////////////////////////////////
+
+class SkLineBoundary : public SkBoundary {
+public:
+    SkPoint fPts[4];
+
+    // override
+    virtual SkPoint eval(Edge, SkScalar);
+};
+
+class SkCubicBoundary : public SkBoundary {
+public:
+    // the caller sets the first 12 entries. The 13th is used by the impl.
+    SkPoint fPts[13];
+
+    // override
+    virtual SkPoint eval(Edge, SkScalar);
+};
+
+#endif