Simplify flattening to just write enough to call the factory

include/effects/SkMorphologyImageFilter.h

 /*
  * Copyright 2012 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 SkMorphologyImageFilter_DEFINED
 #define SkMorphologyImageFilter_DEFINED
@@ skipping 16 matching lines @@
 
     typedef void (*Proc)(const SkPMColor* src, SkPMColor* dst, int radius,
                          int width, int height, int srcStride, int dstStride);
 
 protected:
     SkMorphologyImageFilter(int radiusX, int radiusY, SkImageFilter* input,
                             const CropRect* cropRect);
     bool filterImageGeneric(Proc procX, Proc procY,
                             Proxy*, const SkBitmap& src, const Context&,
                             SkBitmap* result, SkIPoint* offset) const;
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     SkMorphologyImageFilter(SkReadBuffer& buffer);
+#endif
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 #if SK_SUPPORT_GPU
     virtual bool canFilterImageGPU() const SK_OVERRIDE { return true; }
     bool filterImageGPUGeneric(bool dilate, Proxy* proxy, const SkBitmap& src,
                                const Context& ctm, SkBitmap* result,
                                SkIPoint* offset) const;
 #endif
 
     SkISize    radius() const { return fRadius; }
 
 private:
     SkISize    fRadius;
     typedef SkImageFilter INHERITED;
 };
 
 class SK_API SkDilateImageFilter : public SkMorphologyImageFilter {
 public:
     static SkDilateImageFilter* Create(int radiusX, int radiusY,
                                        SkImageFilter* input = NULL,
                                        const CropRect* cropRect = NULL) {
+        if (radiusX < 0 || radiusY < 0) {
+            return NULL;
+        }
         return SkNEW_ARGS(SkDilateImageFilter, (radiusX, radiusY, input, cropRect));
     }
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
 #if SK_SUPPORT_GPU
     virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context&,
                                 SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
 #endif
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDilateImageFilter)
 
 protected:
     SkDilateImageFilter(int radiusX, int radiusY, SkImageFilter* input, const CropRect* cropRect)
         : INHERITED(radiusX, radiusY, input, cropRect) {}
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkDilateImageFilter(SkReadBuffer& buffer) : INHERITED(buffer) {}
+#endif
 
 private:
     typedef SkMorphologyImageFilter INHERITED;
 };
 
 class SK_API SkErodeImageFilter : public SkMorphologyImageFilter {
 public:
     static SkErodeImageFilter* Create(int radiusX, int radiusY,
                                       SkImageFilter* input = NULL,
                                       const CropRect* cropRect = NULL) {
+        if (radiusX < 0 || radiusY < 0) {
+            return NULL;
+        }
         return SkNEW_ARGS(SkErodeImageFilter, (radiusX, radiusY, input, cropRect));
     }
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
 #if SK_SUPPORT_GPU
     virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context&,
                                 SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
 #endif
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkErodeImageFilter)
 
 protected:
     SkErodeImageFilter(int radiusX, int radiusY, SkImageFilter* input, const CropRect* cropRect)
         : INHERITED(radiusX, radiusY, input, cropRect) {}
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkErodeImageFilter(SkReadBuffer& buffer) : INHERITED(buffer) {}
+#endif
 
 private:
     typedef SkMorphologyImageFilter INHERITED;
 };
 
 #endif