[patch 1/1] dlls/windowscodecs/pngformat.c: implemented 'PngDecoder_Block_GetCount'

[Vincent Povirk]

You should take a look at the PNG format spec, particularly the part
about chunks: http://www.libpng.org/pub/png/spec/1.2/PNG-Structure.html

I believe what's needed here is to return all ancillary chunks.