NULL is returned, then error will be set.
Possible errors are in the GDK_PIXBUF_ERROR and G_FILE_ERROR domains.gdkPixbufNewFromFile(filename, .errwarn = TRUE)filenameGdkPixbuf] A newly-created pixbuf with a reference count of 1, or NULL if
any of several error conditions occurred: the file could not be opened,
there was no loader for the file's format, there was not enough memory to
allocate the image buffer, or the image file contained invalid data.error