NULL is returned, then error will be set.
Possible errors are in the GDK_PIXBUF_ERROR and G_FILE_ERROR domains.
The image will be scaled to fit in the requested size, preserving
the image's aspect ratio.gdkPixbufNewFromFileAtSize(filename, width, height, .errwarn = TRUE)filenamewidthheightGdkPixbuf] 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.errorGError] Return location for an error