png_set_read_user_transform_fn 2086 third_party/libpng/png.h extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
png_set_read_user_transform_fn  268 ui/gfx/codec/png_codec.cc     png_set_read_user_transform_fn(png_ptr, ConvertRGBARowToSkia);