Initial error handling code

src/effects/SkBicubicImageFilter.cpp

 /*
  * Copyright 2013 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 "SkBicubicImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 27 matching lines @@
 SkBicubicImageFilter* SkBicubicImageFilter::CreateMitchell(const SkSize& scale,
                                                            SkImageFilter* input) {
     return SkNEW_ARGS(SkBicubicImageFilter, (scale, gMitchellCoefficients, input));
 }
 
 SkBicubicImageFilter::SkBicubicImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
     SkDEBUGCODE(uint32_t readSize =) buffer.readScalarArray(fCoefficients);
     SkASSERT(readSize == 16);
     fScale.fWidth = buffer.readScalar();
     fScale.fHeight = buffer.readScalar();
+    buffer.validate(SkScalarIsFinite(fScale.fWidth) &&
+                    SkScalarIsFinite(fScale.fHeight) &&
+                    (fScale.fWidth >= 0) &&
+                    (fScale.fHeight >= 0));
 }
 
 void SkBicubicImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeScalarArray(fCoefficients, 16);
     buffer.writeScalar(fScale.fWidth);
     buffer.writeScalar(fScale.fHeight);
 }
 
 SkBicubicImageFilter::~SkBicubicImageFilter() {
@@ skipping 129 matching lines @@
     GrPaint paint;
     paint.addColorEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref();
     SkRect srcRect;
     srcBM.getBounds(&srcRect);
     context->drawRectToRect(paint, dstRect, srcRect);
     return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result);
 }
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////