Apply the layer's image filter to the hoisted image

src/image/SkSurface_Gpu.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSurface_Gpu_DEFINED
+#define SkSurface_Gpu_DEFINED
+
+#include "SkSurface_Base.h"
+
+#if SK_SUPPORT_GPU
+
+class SkGpuDevice;
+
+class SkSurface_Gpu : public SkSurface_Base {
+public:
+    SK_DECLARE_INST_COUNT(SkSurface_Gpu)
+
+    SkSurface_Gpu(GrRenderTarget*, const SkSurfaceProps*, bool doClear);
+    virtual ~SkSurface_Gpu();
+
+    virtual SkCanvas* onNewCanvas() SK_OVERRIDE;
+    virtual SkSurface* onNewSurface(const SkImageInfo&) SK_OVERRIDE;
+    virtual SkImage* onNewImageSnapshot() SK_OVERRIDE;
+    virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y,
+                        const SkPaint*) SK_OVERRIDE;
+    virtual void onCopyOnWrite(ContentChangeMode) SK_OVERRIDE;
+    virtual void onDiscard() SK_OVERRIDE;
+
+    SkGpuDevice* getDevice() { return fDevice; }
+
+private:
+    SkGpuDevice* fDevice;
+
+    typedef SkSurface_Base INHERITED;
+};
+
+#endif // SK_SUPPORT_GPU
+
+#endif // SkSurface_Gpu_DEFINED