Implement canvas's globalCompositeOperation lighter properly....

skia/effects/SkKernel33MaskFilter.cpp

 #include "SkKernel33MaskFilter.h"
 #include "SkColorPriv.h"
 
 SkMask::Format SkKernel33ProcMaskFilter::getFormat()
 {
     return SkMask::kA8_Format;
 }
 
 bool SkKernel33ProcMaskFilter::filterMask(SkMask* dst, const SkMask& src, const SkMatrix&, SkIPoint* margin)
 {
     // margin???
     dst->fImage = NULL;
     dst->fBounds = src.fBounds;
     dst->fBounds.inset(-1, -1);
     dst->fFormat = SkMask::kA8_Format;
     
     if (NULL == src.fImage)
         return true;
     
     dst->fRowBytes = dst->fBounds.width();
     size_t size = dst->computeImageSize();
+    if (0 == size) {
+        return false;   // too big to allocate, abort
+    }
     dst->fImage = SkMask::AllocImage(size);
     
     const int h = src.fBounds.height();
     const int w = src.fBounds.width();
     const int srcRB = src.fRowBytes;
     const uint8_t* srcImage = src.fImage;
     uint8_t* dstImage = dst->fImage;
 
     uint8_t* srcRows[3];
     uint8_t storage[3][3];
@@ skipping 81 matching lines @@
     return new SkKernel33MaskFilter(rb);
 }
 
 SkKernel33MaskFilter::SkKernel33MaskFilter(SkFlattenableReadBuffer& rb)
     : SkKernel33ProcMaskFilter(rb)
 {
     rb.read(fKernel, 9 * sizeof(int));
     fShift = rb.readS32();
 }