diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/utils/SkUnitMappers.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/utils/SkUnitMappers.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+
+/*
+ * Copyright 2008 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkUnitMappers_DEFINED
+#define SkUnitMappers_DEFINED
+
+#include "SkUnitMapper.h"
+
+/** This discretizes the range [0...1) into N discret values.
+*/
+class SkDiscreteMapper : public SkUnitMapper {
+public:
+    SkDiscreteMapper(int segments);
+    // override from SkUnitMapper
+    virtual uint16_t mapUnit16(uint16_t x);
+
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDiscreteMapper)
+
+protected:
+    SkDiscreteMapper(SkReadBuffer& );
+    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
+
+private:
+    int     fSegments;
+    int32_t fScale;    // computed from fSegments
+
+    typedef SkUnitMapper INHERITED;
+};
+
+/** This returns cos(x), to simulate lighting a sphere, where 0 maps to the
+    center of the sphere, and 1 maps to the edge.
+*/
+class SkCosineMapper : public SkUnitMapper {
+public:
+    SkCosineMapper() {}
+    // override from SkUnitMapper
+    virtual uint16_t mapUnit16(uint16_t x);
+
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkCosineMapper)
+
+protected:
+    SkCosineMapper(SkReadBuffer&);
+
+private:
+
+    typedef SkUnitMapper INHERITED;
+};
+
+#endif