Adding more validation

src/effects/SkMagnifierImageFilter.cpp

 /*
  * 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.
  */
 
 #include "SkBitmap.h"
 #include "SkMagnifierImageFilter.h"
 #include "SkColorPriv.h"
@@ skipping 214 matching lines @@
 }
 
 void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
     this->updateConstantColorComponentsForModulation(color, validFlags);
 }
 
 #endif
 
 ////////////////////////////////////////////////////////////////////////////////
 SkMagnifierImageFilter::SkMagnifierImageFilter(SkFlattenableReadBuffer& buffer)
-  : INHERITED(buffer) {
+  : INHERITED(1, buffer) {
     float x = buffer.readScalar();
     float y = buffer.readScalar();
     float width = buffer.readScalar();
     float height = buffer.readScalar();
     fSrcRect = SkRect::MakeXYWH(x, y, width, height);
     fInset = buffer.readScalar();
 
     buffer.validate(SkIsValidRect(fSrcRect) && SkScalarIsFinite(fInset));
 }
 
@@ skipping 88 matching lines @@
 
             int x_val = SkMin32(SkScalarFloorToInt(x_interp), width - 1);
             int y_val = SkMin32(SkScalarFloorToInt(y_interp), height - 1);
 
             *dptr = sptr[y_val * width + x_val];
             dptr++;
         }
     }
     return true;
 }