Algorithms
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-static void x_laplace_write_row P_ ((struct frame *, long *,
- int, XImage *, int));
-static void x_laplace_read_row P_ ((struct frame *, Colormap,
- XColor *, int, XImage *, int));
static XColor *x_to_xcolors P_ ((struct frame *, struct image *, int));
static void x_from_xcolors P_ ((struct frame *, struct image *, XColor *));
static void x_detect_edges P_ ((struct frame *, struct image *, int[9], int));