Implement canvas's globalCompositeOperation lighter properly....

skia/effects/SkEmbossMaskFilter.cpp

 /* libs/graphics/effects/SkEmbossMaskFilter.cpp
 **
 ** Copyright 2006, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License"); 
 ** you may not use this file except in compliance with the License. 
 ** You may obtain a copy of the License at 
 **
 **     http://www.apache.org/licenses/LICENSE-2.0 
 **
@@ skipping 70 matching lines @@
         margin->set(SkScalarCeil(radius), SkScalarCeil(radius));
 
     if (src.fImage == NULL)
         return true;
 
     // create a larger buffer for the other two channels (should force fBlur to do this for us)
 
     {
         uint8_t* alphaPlane = dst->fImage;
         size_t   planeSize = dst->computeImageSize();
-
+        if (0 == planeSize) {
+            return false;   // too big to allocate, abort
+        }
         dst->fImage = SkMask::AllocImage(planeSize * 3);
         memcpy(dst->fImage, alphaPlane, planeSize);
         SkMask::FreeImage(alphaPlane);
     }
 
     // run the light direction through the matrix...
     Light   light = fLight;
     matrix.mapVectors((SkVector*)(void*)light.fDirection, (SkVector*)(void*)fLight.fDirection, 1);
 
     // now restore the length of the XY component
@@ skipping 30 matching lines @@
 
 void SkEmbossMaskFilter::flatten(SkFlattenableWriteBuffer& buffer)
 {
     this->INHERITED::flatten(buffer);
 
     fLight.fPad = 0;    // for the font-cache lookup to be clean
     buffer.writeMul4(&fLight, sizeof(fLight));
     buffer.writeScalar(fBlurRadius);
 }