pixbuf_width = gdk_pixbuf_get_width (pixbuf);
pixbuf_height = gdk_pixbuf_get_height (pixbuf);
- g_return_val_if_fail (pixbuf_width == 0 || pixbuf_height == 0, NULL);
+ g_return_val_if_fail (pixbuf_width != 0 && pixbuf_height != 0, NULL);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);