png_convert_size  833 third_party/libpng/png.c    PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
png_convert_size 3154 third_party/libpng/png.h    PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size))
png_convert_size 1245 third_party/libpng/pngconf.h #  define png_sizeof(x) png_convert_size(sizeof(x))