diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/core/SkComposeShader.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/core/SkComposeShader.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+
+/*
+ * Copyright 2006 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 SkComposeShader_DEFINED
+#define SkComposeShader_DEFINED
+
+#include "SkShader.h"
+
+class SkXfermode;
+
+///////////////////////////////////////////////////////////////////////////////////////////
+
+/** \class SkComposeShader
+    This subclass of shader returns the coposition of two other shaders, combined by
+    a xfermode.
+*/
+class SK_API SkComposeShader : public SkShader {
+public:
+    /** Create a new compose shader, given shaders A, B, and a combining xfermode mode.
+        When the xfermode is called, it will be given the result from shader A as its
+        "dst", and the result of from shader B as its "src".
+        mode->xfer32(sA_result, sB_result, ...)
+        @param shaderA  The colors from this shader are seen as the "dst" by the xfermode
+        @param shaderB  The colors from this shader are seen as the "src" by the xfermode
+        @param mode     The xfermode that combines the colors from the two shaders. If mode
+                        is null, then SRC_OVER is assumed.
+    */
+    SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode = NULL);
+    virtual ~SkComposeShader();
+
+    virtual bool setContext(const SkBitmap&, const SkPaint&,
+                            const SkMatrix&) SK_OVERRIDE;
+    virtual void endContext() SK_OVERRIDE;
+    virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE;
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeShader)
+
+protected:
+    SkComposeShader(SkReadBuffer& );
+    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
+
+private:
+
+    SkShader*   fShaderA;
+    SkShader*   fShaderB;
+    SkXfermode* fMode;
+
+    typedef SkShader INHERITED;
+};
+
+#endif