PixelElementsAccessor  106 src/elements.cc   V(PixelElementsAccessor, EXTERNAL_PIXEL_ELEMENTS, ExternalPixelArray)
PixelElementsAccessor 1247 src/elements.cc     : public ExternalElementsAccessor<PixelElementsAccessor,
PixelElementsAccessor 1250 src/elements.cc   explicit PixelElementsAccessor(const char* name)