SkAlphaThresholdFilter allow flattening

src/effects/SkAlphaThresholdFilterImpl.h

Index: src/effects/SkAlphaThresholdFilterImpl.h
diff --git a/include/effects/SkMagnifierImageFilter.h b/src/effects/SkAlphaThresholdFilterImpl.h
similarity index 51%
copy from include/effects/SkMagnifierImageFilter.h
copy to src/effects/SkAlphaThresholdFilterImpl.h
index af142e9eff8436a87c212546e46b3adc444dc9b7..2d3b288c229d7fbb49401bca7597516a9278b513 100644
--- a/include/effects/SkMagnifierImageFilter.h
+++ b/src/effects/SkAlphaThresholdFilterImpl.h
@@ -1,26 +1,24 @@
 /*
- * 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
 
-
-#ifndef SkMagnifierImageFilter_DEFINED
-#define SkMagnifierImageFilter_DEFINED
-
-#include "SkRect.h"
 #include "SkImageFilter.h"
+#include "SkRegion.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&,
@@ -31,9 +29,10 @@ protected:
 #endif
 
 private:
-    SkRect fSrcRect;
-    SkScalar fInset;
+    SkRegion fRegion;
+    SkScalar fInnerThreshold;
+    SkScalar fOuterThreshold;
     typedef SkImageFilter INHERITED;
 };
 
-#endif
+#endif  // SkAlphaThresholdFilterImpl_DEFINED