SkAlphaThresholdFilter allow flattening

src/effects/SkAlphaThresholdFilterImpl.h

 /*
- * Copyright 2012 The Android Open Source Project
+ * 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 SkAlphaThresholdFilterImpl_DEFINED
+#define SkAlphaThresholdFilterImpl_DEFINED
 
+#include "SkImageFilter.h"
+#include "SkRegion.h"
 
-#ifndef SkMagnifierImageFilter_DEFINED
-#define SkMagnifierImageFilter_DEFINED
-
-#include "SkRect.h"
-#include "SkImageFilter.h"
-
-class SK_API SkMagnifierImageFilter : public SkImageFilter {
+class SK_API SkAlphaThresholdFilterImpl : public SkImageFilter {
 public:
-    static SkImageFilter* Create(const SkRect& src, SkScalar inset, SkImageFilter* input = NULL);
+    SkAlphaThresholdFilterImpl(const SkRegion& region, SkScalar innerThreshold,
+                               SkScalar outerThreshold, SkImageFilter* input);
 
     SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMagnifierImageFilter)
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAlphaThresholdFilterImpl)
 
 protected:
-    SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset, SkImageFilter* input);
     void flatten(SkWriteBuffer&) const override;
 
     bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                        SkBitmap* result, SkIPoint* offset) const override;
 #if SK_SUPPORT_GPU
     bool asFragmentProcessor(GrFragmentProcessor**, GrTexture*, const SkMatrix&,
                              const SkIRect& bounds) const override;
 #endif
 
 private:
-    SkRect fSrcRect;
-    SkScalar fInset;
+    SkRegion fRegion;
+    SkScalar fInnerThreshold;
+    SkScalar fOuterThreshold;
     typedef SkImageFilter INHERITED;
 };
 
-#endif
+#endif  // SkAlphaThresholdFilterImpl_DEFINED