(fringe_bitmaps, fringe_faces): Change to pointers.
(max_fringe_bitmaps): New var.
(Fdefine_fringe_bitmap): Expand fringe_bitmaps and fringe_faces.
(init_fringe): Allocate fringe_bitmaps and fringe_faces.
(lookup_fringe_bitmap): New function.
(valid_fringe_bitmap_p, resolve_fringe_bitmap): Remove.
(Fdestroy_fringe_bitmap): Use lookup_fringe_bitmap.
Keep standard bitmaps in Vfringe_bitmaps.
(Fdefine_fringe_bitmap): Use lookup_fringe_bitmap.
(Fset_fringe_bitmap_face): Likewise.
(syms_of_fringe): DEFVAR_LISP it.
(valid_fringe_bitmap_p): Rename from valid_fringe_bitmap_id_p.
Change arg to Lisp_Object and fail if not an integer.
(get_fringe_bitmap_name, resolve_fringe_bitmap)
(destroy_fringe_bitmap): New functions.
(Fdestroy_fringe_bitmap): Change arg to bitmap symbol. Use
destroy_fringe_bitmap. Remove symbol from Vfringe_bitmaps and
clear its fringe property.
(init_fringe_bitmap): Use destroy_fringe_bitmap instead of
Fdestroy_fringe_bitmap.
(Fdefine_fringe_bitmap): Add BITMAP arg specifying new or existing
bitmap symbol; remove WHICH arg. Add symbol to Vfringe_bitmaps
and set fringe property. Signal error if no free slots.
(Fset_fringe_bitmap_face): Change arg to bitmap symbol.
(Ffringe_bitmaps_at_pos): Return bitmap symbols instead of numbers.
short to facilitate 16 bits wide bitmaps. Modify all standard
bitmaps accordingly.
(BYTES_PER_BITMAP_ROW, STANDARD_BITMAP_HEIGHT): New macros.
(FRBITS): Use STANDARD_BITMAP_HEIGHT instead of just sizeof.
(draw_fringe_bitmap): Ditto.
(init_fringe_bitmap) [MAC_OS]: Don't bitswap.
(init_fringe_bitmap) [HAVE_X_WINDOWS]: Enhance bitswapping to
handle up to 16 bits wide bitmaps.
(Fdefine_fringe_bitmap): Doc fix. Handle wider bitmaps.
and code from dispextern.h and xdisp.c here.
Rework code to support user defined fringe bitmaps, redefining
standard bitmaps, ability to overlay user defined bitmap with
overlay arrow bitmap, and add faces to bitmaps.
(Voverflow_newline_into_fringe): Declare here.
(enum fringe_bitmap_align): New enum.
(..._bits): All bitmaps are now defined without bitswapping; that
is now done in init_fringe_once (if necessary).
(standard_bitmaps): New array with specifications for the
standard fringe bitmaps.
(fringe_faces): New array.
(valid_fringe_bitmap_id_p): New function.
(draw_fringe_bitmap_1): Rename from draw_fringe_bitmap.
(draw_fringe_bitmap): New function which draws fringe bitmap,
possibly overlaying bitmap with cursor in right fringe or the
overlay arrow in the left fringe.
(update_window_fringes): Do not handle overlay arrow here.
Compare and copy fringe bitmap faces.
(init_fringe_bitmap): New function.
(Fdefine_fringe_bitmap, Fdestroy_fringe_bitmap): New DEFUNs to
define and destroy user defined fringe bitmaps.
(Fset_fringe_bitmap_face): New DEFUN to set face for a fringe bitmap.
(Ffringe_bitmaps_at_pos): New DEFUN to read current fringe bitmaps.
(syms_of_fringe): New function. Defsubr new DEFUNs.
DEFVAR_LISP Voverflow_newline_into_fringe.
(init_fringe_once, init_fringe): New functions.
(w32_init_fringe, w32_reset_fringes) [WINDOWS_NT]: New functions.
