macterm.c 369 KB
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/* Implementation of GUI terminal on the Mac OS.
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   Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

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/* Contributed by Andrew Choi (akochoi@mac.com).  */
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#include <config.h>
#include <signal.h>
#include <stdio.h>
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#include <stdlib.h>
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#include "lisp.h"
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#include "charset.h"
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#include "blockinput.h"

#include "macterm.h"

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#ifndef MAC_OSX
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#include <alloca.h>
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#endif
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#ifdef MAC_OSX
#undef mktime
#undef DEBUG
#undef free
#undef malloc
#undef realloc
/* Macros max and min defined in lisp.h conflict with those in
   precompiled header Carbon.h.  */
#undef max
#undef min
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#undef init_process
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#include <Carbon/Carbon.h>
#undef free
#define free unexec_free
#undef malloc
#define malloc unexec_malloc
#undef realloc
#define realloc unexec_realloc
#undef min
#define min(a, b) ((a) < (b) ? (a) : (b))
#undef max
#define max(a, b) ((a) > (b) ? (a) : (b))
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#undef init_process
#define init_process emacs_init_process
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#else /* not MAC_OSX */
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#include <Quickdraw.h>
#include <ToolUtils.h>
#include <Sound.h>
#include <Events.h>
#include <Script.h>
#include <Resources.h>
#include <Fonts.h>
#include <TextUtils.h>
#include <LowMem.h>
#include <Controls.h>
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#if defined (__MRC__) || (__MSL__ >= 0x6000)
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#include <ControlDefinitions.h>
#endif
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#include <Gestalt.h>
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#if __profile__
#include <profiler.h>
#endif
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#endif /* not MAC_OSX */
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#include "systty.h"
#include "systime.h"
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#include "atimer.h"
#include "keymap.h"
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#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>

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#include "keyboard.h"
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#include "frame.h"
#include "dispextern.h"
#include "fontset.h"
#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
#include "window.h"
#include "intervals.h"
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#include "composite.h"
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#include "coding.h"

#define BETWEEN(X, LOWER, UPPER)  ((X) >= (LOWER) && (X) < (UPPER))


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/* Fringe bitmaps.  */
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enum fringe_bitmap_type
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{
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  NO_FRINGE_BITMAP,
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  LEFT_TRUNCATION_BITMAP,
  RIGHT_TRUNCATION_BITMAP,
  OVERLAY_ARROW_BITMAP,
  CONTINUED_LINE_BITMAP,
  CONTINUATION_LINE_BITMAP,
  ZV_LINE_BITMAP
};

/* Bitmap drawn to indicate lines not displaying text if
   `indicate-empty-lines' is non-nil.  */

#define zv_width 8
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#define zv_height 72
#define zv_period 3
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static unsigned char zv_bits[] = {
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  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00,
  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00,
  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00,
  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00,
  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00,
  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00,
  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00,
  0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00};
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/* An arrow like this: `<-'.  */

#define left_width 8
#define left_height 8
static unsigned char left_bits[] = {
   0x18, 0x30, 0x60, 0xfc, 0xfc, 0x60, 0x30, 0x18};

/* Right truncation arrow bitmap `->'.  */

#define right_width 8
#define right_height 8
static unsigned char right_bits[] = {
   0x18, 0x0c, 0x06, 0x3f, 0x3f, 0x06, 0x0c, 0x18};

/* Marker for continued lines.  */

#define continued_width 8
#define continued_height 8
static unsigned char continued_bits[] = {
   0x3c, 0x3e, 0x03, 0x27, 0x3f, 0x3e, 0x3c, 0x3e};

/* Marker for continuation lines.  */

#define continuation_width 8
#define continuation_height 8
static unsigned char continuation_bits[] = {
   0x3c, 0x7c, 0xc0, 0xe4, 0xfc, 0x7c, 0x3c, 0x7c};

/* Overlay arrow bitmap.  */

#if 0
/* A bomb.  */
#define ov_width 8
#define ov_height 8
static unsigned char ov_bits[] = {
   0x0c, 0x10, 0x3c, 0x7e, 0x5e, 0x5e, 0x46, 0x3c};
#else
/* A triangular arrow.  */
#define ov_width 8
#define ov_height 8
static unsigned char ov_bits[] = {
   0xc0, 0xf0, 0xf8, 0xfc, 0xfc, 0xf8, 0xf0, 0xc0};
#endif

extern Lisp_Object Qhelp_echo;


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/* Non-nil means Emacs uses toolkit scroll bars.  */
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Lisp_Object Vx_toolkit_scroll_bars;
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/* If a string, XTread_socket generates an event to display that string.
   (The display is done in read_char.)  */
   
static Lisp_Object help_echo;
static Lisp_Object help_echo_window;
static Lisp_Object help_echo_object;
static int help_echo_pos;

/* Temporary variable for XTread_socket.  */

static Lisp_Object previous_help_echo;

/* Non-zero means that a HELP_EVENT has been generated since Emacs
   start.  */

static int any_help_event_p;

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/* Non-zero means autoselect window with the mouse cursor.  */

int x_autoselect_window_p;

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/* Non-zero means draw block and hollow cursor as wide as the glyph
   under it.  For example, if a block cursor is over a tab, it will be
   drawn as wide as that tab on the display.  */

int x_stretch_cursor_p;

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/* Non-zero means make use of UNDERLINE_POSITION font properties.  */

int x_use_underline_position_properties;

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/* This is a chain of structures for all the X displays currently in
   use.  */

struct x_display_info *x_display_list;

/* This is a list of cons cells, each of the form (NAME
   . FONT-LIST-CACHE), one for each element of x_display_list and in
   the same order.  NAME is the name of the frame.  FONT-LIST-CACHE
   records previous values returned by x-list-fonts.  */

Lisp_Object x_display_name_list;

/* This is display since Mac does not support multiple ones.  */
struct mac_display_info one_mac_display_info;

/* Frame being updated by update_frame.  This is declared in term.c.
   This is set by update_begin and looked at by all the XT functions.
   It is zero while not inside an update.  In that case, the XT
   functions assume that `selected_frame' is the frame to apply to.  */

extern struct frame *updating_frame;

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extern int waiting_for_input;

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/* This is a frame waiting to be auto-raised, within XTread_socket.  */

struct frame *pending_autoraise_frame;

/* Nominal cursor position -- where to draw output.  
   HPOS and VPOS are window relative glyph matrix coordinates.
   X and Y are window relative pixel coordinates.  */

struct cursor_pos output_cursor;

/* Non-zero means user is interacting with a toolkit scroll bar.  */

static int toolkit_scroll_bar_interaction;

/* Mouse movement.

   Formerly, we used PointerMotionHintMask (in standard_event_mask)
   so that we would have to call XQueryPointer after each MotionNotify
   event to ask for another such event.  However, this made mouse tracking
   slow, and there was a bug that made it eventually stop.

   Simply asking for MotionNotify all the time seems to work better.

   In order to avoid asking for motion events and then throwing most
   of them away or busy-polling the server for mouse positions, we ask
   the server for pointer motion hints.  This means that we get only
   one event per group of mouse movements.  "Groups" are delimited by
   other kinds of events (focus changes and button clicks, for
   example), or by XQueryPointer calls; when one of these happens, we
   get another MotionNotify event the next time the mouse moves.  This
   is at least as efficient as getting motion events when mouse
   tracking is on, and I suspect only negligibly worse when tracking
   is off.  */

/* Where the mouse was last time we reported a mouse event.  */

FRAME_PTR last_mouse_frame;
static Rect last_mouse_glyph;
static Lisp_Object last_mouse_press_frame;

/* The scroll bar in which the last X motion event occurred.

   If the last X motion event occurred in a scroll bar, we set this so
   XTmouse_position can know whether to report a scroll bar motion or
   an ordinary motion.

   If the last X motion event didn't occur in a scroll bar, we set
   this to Qnil, to tell XTmouse_position to return an ordinary motion
   event.  */

static Lisp_Object last_mouse_scroll_bar;

/* This is a hack.  We would really prefer that XTmouse_position would
   return the time associated with the position it returns, but there
   doesn't seem to be any way to wrest the time-stamp from the server
   along with the position query.  So, we just keep track of the time
   of the last movement we received, and return that in hopes that
   it's somewhat accurate.  */

static Time last_mouse_movement_time;

enum mouse_tracking_type {
  mouse_tracking_none,
  mouse_tracking_mouse_movement,
  mouse_tracking_scroll_bar
};

enum mouse_tracking_type mouse_tracking_in_progress = mouse_tracking_none;

struct scroll_bar *tracked_scroll_bar = NULL;

/* Incremented by XTread_socket whenever it really tries to read
   events.  */

#ifdef __STDC__
static int volatile input_signal_count;
#else
static int input_signal_count;
#endif

/* Used locally within XTread_socket.  */

static int x_noop_count;

/* Initial values of argv and argc.  */

extern char **initial_argv;
extern int initial_argc;

extern Lisp_Object Vcommand_line_args, Vsystem_name;

/* Tells if a window manager is present or not.  */

extern Lisp_Object Vx_no_window_manager;

extern Lisp_Object Qface, Qmouse_face;

extern int errno;

/* A mask of extra modifier bits to put into every keyboard char.  */

extern int extra_keyboard_modifiers;

static Lisp_Object Qvendor_specific_keysyms;

#if 0
extern XrmDatabase x_load_resources P_ ((Display *, char *, char *, char *));
#endif

extern Lisp_Object x_icon_type P_ ((struct frame *));


#if __MRC__
QDGlobals qd;  /* QuickDraw global information structure.  */
#endif


/* Enumeration for overriding/changing the face to use for drawing
   glyphs in x_draw_glyphs.  */

enum draw_glyphs_face
{
  DRAW_NORMAL_TEXT,
  DRAW_INVERSE_VIDEO,
  DRAW_CURSOR,
  DRAW_MOUSE_FACE,
  DRAW_IMAGE_RAISED,
  DRAW_IMAGE_SUNKEN
};

struct frame * x_window_to_frame (struct mac_display_info *, WindowPtr);
struct mac_display_info *mac_display_info_for_display (Display *);
static void x_update_window_end P_ ((struct window *, int, int));
static void frame_to_window_pixel_xy P_ ((struct window *, int *, int *));
static int fast_find_position P_ ((struct window *, int, int *, int *,
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				   int *, int *, Lisp_Object));
static int fast_find_string_pos P_ ((struct window *, int, Lisp_Object,
				     int *, int *, int *, int *, int));
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static void set_output_cursor P_ ((struct cursor_pos *));
static struct glyph *x_y_to_hpos_vpos P_ ((struct window *, int, int,
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					   int *, int *, int *, int));
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static void note_mode_line_highlight P_ ((struct window *, int, int));
static void note_mouse_highlight P_ ((struct frame *, int, int));
static void note_tool_bar_highlight P_ ((struct frame *f, int, int));
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static void x_handle_tool_bar_click P_ ((struct frame *, EventRecord *));
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static void show_mouse_face P_ ((struct x_display_info *,
				 enum draw_glyphs_face));
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static int cursor_in_mouse_face_p P_ ((struct window *));
static int clear_mouse_face P_ ((struct mac_display_info *));
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static int x_io_error_quitter P_ ((Display *));
int x_catch_errors P_ ((Display *));
void x_uncatch_errors P_ ((Display *, int));
void x_lower_frame P_ ((struct frame *));
void x_scroll_bar_clear P_ ((struct frame *));
int x_had_errors_p P_ ((Display *));
void x_wm_set_size_hint P_ ((struct frame *, long, int));
void x_raise_frame P_ ((struct frame *));
void x_set_window_size P_ ((struct frame *, int, int, int));
void x_wm_set_window_state P_ ((struct frame *, int));
void x_wm_set_icon_pixmap P_ ((struct frame *, int));
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void mac_initialize P_ ((void));
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static void x_font_min_bounds P_ ((XFontStruct *, int *, int *));
static int x_compute_min_glyph_bounds P_ ((struct frame *));
enum text_cursor_kinds x_specified_cursor_type P_ ((Lisp_Object, int *));
static void x_draw_phys_cursor_glyph P_ ((struct window *,
					  struct glyph_row *,
					  enum draw_glyphs_face));
static void x_update_end P_ ((struct frame *));
static void XTframe_up_to_date P_ ((struct frame *));
static void XTreassert_line_highlight P_ ((int, int));
static void x_change_line_highlight P_ ((int, int, int, int));
static void XTset_terminal_modes P_ ((void));
static void XTreset_terminal_modes P_ ((void));
static void XTcursor_to P_ ((int, int, int, int));
static void x_write_glyphs P_ ((struct glyph *, int));
static void x_clear_end_of_line P_ ((int));
static void x_clear_frame P_ ((void));
static void x_clear_cursor P_ ((struct window *));
static void frame_highlight P_ ((struct frame *));
static void frame_unhighlight P_ ((struct frame *));
static void x_new_focus_frame P_ ((struct x_display_info *, struct frame *));
static void XTframe_rehighlight P_ ((struct frame *));
static void x_frame_rehighlight P_ ((struct x_display_info *));
static void x_draw_hollow_cursor P_ ((struct window *, struct glyph_row *));
static void x_draw_bar_cursor P_ ((struct window *, struct glyph_row *, int));
static int x_intersect_rectangles P_ ((Rect *, Rect *, Rect *));
static void expose_frame P_ ((struct frame *, int, int, int, int));
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static int expose_window_tree P_ ((struct window *, Rect *));
static int expose_window P_ ((struct window *, Rect *));
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static void expose_area P_ ((struct window *, struct glyph_row *,
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			     Rect *, enum glyph_row_area));
static int expose_line P_ ((struct window *, struct glyph_row *,
			    Rect *));
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void x_display_cursor (struct window *, int, int, int, int, int);
void x_update_cursor P_ ((struct frame *, int));
static void x_update_cursor_in_window_tree P_ ((struct window *, int));
static void x_update_window_cursor P_ ((struct window *, int));
static void x_erase_phys_cursor P_ ((struct window *));
void x_display_and_set_cursor P_ ((struct window *, int, int, int, int, int));
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static void x_draw_fringe_bitmap P_ ((struct window *, struct glyph_row *, 
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				      enum fringe_bitmap_type, int left_p));
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static void x_clip_to_row P_ ((struct window *, struct glyph_row *,
			       GC, int));
static int x_phys_cursor_in_rect_p P_ ((struct window *, Rect *));
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static void x_draw_row_fringe_bitmaps P_ ((struct window *, struct glyph_row *));
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static void notice_overwritten_cursor P_ ((struct window *,
					   enum glyph_row_area,
					   int, int, int, int));
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static void x_flush P_ ((struct frame *f));
static void x_update_begin P_ ((struct frame *));
static void x_update_window_begin P_ ((struct window *));
static void x_draw_vertical_border P_ ((struct window *));
static void x_after_update_window_line P_ ((struct glyph_row *));
static INLINE void take_vertical_position_into_account P_ ((struct it *));
static void x_produce_stretch_glyph P_ ((struct it *));

static void activate_scroll_bars (FRAME_PTR);
static void deactivate_scroll_bars (FRAME_PTR);

extern int image_ascent (struct image *, struct face *);
void x_set_offset (struct frame *, int, int, int);
int x_bitmap_icon (struct frame *, Lisp_Object);
void x_make_frame_visible (struct frame *);

extern void window_scroll (Lisp_Object, int, int, int);

/* Defined in macmenu.h.  */
extern void menubar_selection_callback (FRAME_PTR, int);
extern void set_frame_menubar (FRAME_PTR, int, int);

/* X display function emulation */

/* Structure borrowed from Xlib.h to represent two-byte characters in
   dumpglyphs.  */

typedef struct {
  unsigned char byte1;
  unsigned char byte2;
} XChar2b;

static void
XFreePixmap (display, pixmap)
     Display *display;
     Pixmap pixmap;
{
  PixMap *p = (PixMap *) pixmap;
  
  xfree (p->baseAddr);
  xfree (p);
}


/* Set foreground color for subsequent QuickDraw commands.  Assume
   graphic port has already been set.  */

static void
mac_set_forecolor (unsigned long color)
{
  RGBColor fg_color;
						
  fg_color.red = RED_FROM_ULONG (color) * 256;
  fg_color.green = GREEN_FROM_ULONG (color) * 256;
  fg_color.blue = BLUE_FROM_ULONG (color) * 256;
			
  RGBForeColor (&fg_color);  
}


/* Set background color for subsequent QuickDraw commands.  Assume
   graphic port has already been set.  */

static void
mac_set_backcolor (unsigned long color)
{
  RGBColor bg_color;
						
  bg_color.red = RED_FROM_ULONG (color) * 256;
  bg_color.green = GREEN_FROM_ULONG (color) * 256;
  bg_color.blue = BLUE_FROM_ULONG (color) * 256;
			
  RGBBackColor (&bg_color);  
}

/* Set foreground and background color for subsequent QuickDraw
   commands.  Assume that the graphic port has already been set.  */

static void
mac_set_colors (GC gc)
{
  mac_set_forecolor (gc->foreground);
  mac_set_backcolor (gc->background);
}

/* Mac version of XDrawLine.  */

static void
XDrawLine (display, w, gc, x1, y1, x2, y2)
     Display *display;
     WindowPtr w;
     GC gc;
     int x1, y1, x2, y2;
{
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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (gc);

  MoveTo (x1, y1);
  LineTo (x2, y2);
}

/* Mac version of XClearArea.  */

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void
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XClearArea (display, w, x, y, width, height, exposures)
     Display *display;
     WindowPtr w;
     int x, y;
     unsigned int width, height;
     int exposures;
{
  struct mac_output *mwp = (mac_output *) GetWRefCon (w);
  Rect r;
  XGCValues xgc;

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  xgc.foreground = mwp->x_compatible.foreground_pixel;
  xgc.background = mwp->x_compatible.background_pixel;
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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (&xgc);
  SetRect (&r, x, y, x + width, y + height);

  EraseRect (&r);
}

/* Mac version of XClearWindow.  */

static void
XClearWindow (display, w)
     Display *display;
     WindowPtr w;
{
  struct mac_output *mwp = (mac_output *) GetWRefCon (w);
  XGCValues xgc;

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  xgc.foreground = mwp->x_compatible.foreground_pixel;
  xgc.background = mwp->x_compatible.background_pixel;
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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (&xgc);

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#if TARGET_API_MAC_CARBON
  {
    Rect r;
    
    GetWindowPortBounds (w, &r);
    EraseRect (&r);
  }
#else /* not TARGET_API_MAC_CARBON */
  EraseRect (&(w->portRect));
#endif /* not TARGET_API_MAC_CARBON */
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}


/* Mac replacement for XCopyArea.  */

static void
mac_draw_bitmap (display, w, gc, x, y, bitmap)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     BitMap *bitmap;
{
  Rect r;

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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (gc);
  SetRect (&r, x, y, x + bitmap->bounds.right, y + bitmap->bounds.bottom);

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#if TARGET_API_MAC_CARBON
  {
    PixMapHandle pmh;

    LockPortBits (GetWindowPort (w));
    pmh = GetPortPixMap (GetWindowPort (w));
    CopyBits (bitmap, (BitMap *) *pmh, &(bitmap->bounds), &r, srcCopy, 0);
    UnlockPortBits (GetWindowPort (w));
  }
#else /* not TARGET_API_MAC_CARBON */
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  CopyBits (bitmap, &(w->portBits), &(bitmap->bounds), &r, srcCopy, 0);	
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#endif /* not TARGET_API_MAC_CARBON */
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}


/* Mac replacement for XSetClipRectangles.  */

static void
mac_set_clip_rectangle (display, w, r)
     Display *display;
     WindowPtr w;
     Rect *r;
{
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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif
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  ClipRect (r);
}


/* Mac replacement for XSetClipMask.  */

static void
mac_reset_clipping (display, w)
     Display *display;
     WindowPtr w;
{
  Rect r;
  
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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif
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  SetRect (&r, -32767, -32767, 32767, 32767);
  ClipRect (&r);
}


/* Mac replacement for XCreateBitmapFromBitmapData.  */

static void
mac_create_bitmap_from_bitmap_data (bitmap, bits, w, h)
     BitMap *bitmap;
     char *bits;
     int w, h;
{
  int bytes_per_row, i, j;

  bitmap->rowBytes = (w + 15) / 16 * 2;  /* must be on word boundary */
  bitmap->baseAddr = xmalloc (bitmap->rowBytes * h);
  if (!bitmap->baseAddr)
    abort ();

  bzero (bitmap->baseAddr, bitmap->rowBytes * h);
  for (i = 0; i < h; i++)
    for (j = 0; j < w; j++)
      if (BitTst (bits, i * w + j))
        BitSet (bitmap->baseAddr, i * bitmap->rowBytes * 8 + j);

  SetRect (&(bitmap->bounds), 0, 0, w, h);
}


static void
mac_free_bitmap (bitmap)
     BitMap *bitmap;
{
  xfree (bitmap->baseAddr);
}

/* Mac replacement for XFillRectangle.  */

static void
XFillRectangle (display, w, gc, x, y, width, height)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     unsigned int width, height;
{
  Rect r;

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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (gc);
  SetRect (&r, x, y, x + width, y + height);

  PaintRect (&r); /* using foreground color of gc */
}


/* Mac replacement for XDrawRectangle: dest is a window.  */

static void
mac_draw_rectangle (display, w, gc, x, y, width, height)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     unsigned int width, height;
{
  Rect r;

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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (gc);
  SetRect (&r, x, y, x + width + 1, y + height + 1);

  FrameRect (&r); /* using foreground color of gc */
}


/* Mac replacement for XDrawRectangle: dest is a Pixmap.  */

static void
mac_draw_rectangle_to_pixmap (display, p, gc, x, y, width, height)
     Display *display;
     Pixmap p;
     GC gc;
     int x, y;
     unsigned int width, height;
{
#if 0 /* MAC_TODO: draw a rectangle in a PixMap */
  Rect r;

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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (gc);
  SetRect (&r, x, y, x + width, y + height);

  FrameRect (&r); /* using foreground color of gc */
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#endif /* 0 */
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}


static void
mac_draw_string_common (display, w, gc, x, y, buf, nchars, mode,
			bytes_per_char)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     char *buf;
     int nchars, mode, bytes_per_char;
{
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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (w));
#else
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  SetPort (w);
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#endif

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  mac_set_colors (gc);

  TextFont (gc->font->mac_fontnum);
  TextSize (gc->font->mac_fontsize);
  TextFace (gc->font->mac_fontface);
  TextMode (mode);

  MoveTo (x, y);
  DrawText (buf, 0, nchars * bytes_per_char);
}


/* Mac replacement for XDrawString.  */

static void
XDrawString (display, w, gc, x, y, buf, nchars)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     char *buf;
     int nchars;
{
  mac_draw_string_common (display, w, gc, x, y, buf, nchars, srcOr, 1);
}


/* Mac replacement for XDrawString16. */

static void
XDrawString16 (display, w, gc, x, y, buf, nchars)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     XChar2b *buf;
     int nchars;
{
  mac_draw_string_common (display, w, gc, x, y, (char *) buf, nchars, srcOr,
			  2);
}


/* Mac replacement for XDrawImageString.  */

static void
XDrawImageString (display, w, gc, x, y, buf, nchars)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     char *buf;
     int nchars;
{
  mac_draw_string_common (display, w, gc, x, y, buf, nchars, srcCopy, 1);
}


/* Mac replacement for XDrawString16.  */

static void
XDrawImageString16 (display, w, gc, x, y, buf, nchars)
     Display *display;
     WindowPtr w;
     GC gc;
     int x, y;
     XChar2b *buf;
     int nchars;
{
  mac_draw_string_common (display, w, gc, x, y, (char *) buf, nchars, srcCopy,
			  2);
}


/* Mac replacement for XCopyArea: dest must be window.  */

static void
mac_copy_area (display, src, dest, gc, src_x, src_y, width, height, dest_x,
	       dest_y)
     Display *display;
     Pixmap src;
     WindowPtr dest;
     GC gc;
     int src_x, src_y;
     unsigned int width, height;
     int dest_x, dest_y;
{
  Rect src_r, dest_r;

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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (dest));
#else
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  SetPort (dest);
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#endif

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  mac_set_colors (gc);

  SetRect (&src_r, src_x, src_y, src_x + width, src_y + height);
  SetRect (&dest_r, dest_x, dest_y, dest_x + width, dest_y + height);

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#if TARGET_API_MAC_CARBON
  {
    PixMapHandle pmh;

    LockPortBits (GetWindowPort (dest));
    pmh = GetPortPixMap (GetWindowPort (dest));
    CopyBits ((BitMap *) &src, (BitMap *) *pmh, &src_r, &dest_r, srcCopy, 0);
    UnlockPortBits (GetWindowPort (dest));
  }
#else /* not TARGET_API_MAC_CARBON */
  CopyBits ((BitMap *) &src, &(dest->portBits), &src_r, &dest_r, srcCopy, 0);
#endif /* not TARGET_API_MAC_CARBON */
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}


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#if 0
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/* Convert a pair of local coordinates to global (screen) coordinates.
   Assume graphic port has been properly set.  */
static void
local_to_global_coord (short *h, short *v)
{
  Point p;
  
  p.h = *h;
  p.v = *v;
  
  LocalToGlobal (&p);
  
  *h = p.h;
  *v = p.v;
}
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#endif
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/* Mac replacement for XCopyArea: used only for scrolling.  */

static void
mac_scroll_area (display, w, gc, src_x, src_y, width, height, dest_x, dest_y)
     Display *display;
     WindowPtr w;
     GC gc;
     int src_x, src_y;
     unsigned int width, height;
     int dest_x, dest_y;
{
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#if TARGET_API_MAC_CARBON
  Rect gw_r, src_r, dest_r;
  PixMapHandle pmh;

  SetRect (&src_r, src_x, src_y, src_x + width, src_y + height);
  SetRect (&dest_r, dest_x, dest_y, dest_x + width, dest_y + height);

  SetPort (GetWindowPort (w));
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  ForeColor (blackColor);
  BackColor (whiteColor);
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  LockPortBits (GetWindowPort (w));
  pmh = GetPortPixMap (GetWindowPort (w));
  CopyBits ((BitMap *) *pmh, (BitMap *) *pmh, &src_r, &dest_r, srcCopy, 0);
  UnlockPortBits (GetWindowPort (w));
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  mac_set_colors (gc);
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#else /* not TARGET_API_MAC_CARBON */
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  Rect src_r, dest_r;

  SetPort (w);
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#if 0
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  mac_set_colors (gc);
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#endif
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  SetRect (&src_r, src_x, src_y, src_x + width, src_y + height);
  SetRect (&dest_r, dest_x, dest_y, dest_x + width, dest_y + height);

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#if 0
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  /* Need to use global coordinates and screenBits since src and dest
     areas overlap in general.  */
  local_to_global_coord (&src_r.left, &src_r.top);
  local_to_global_coord (&src_r.right, &src_r.bottom);
  local_to_global_coord (&dest_r.left, &dest_r.top);
  local_to_global_coord (&dest_r.right, &dest_r.bottom);

  CopyBits (&qd.screenBits, &qd.screenBits, &src_r, &dest_r, srcCopy, 0);
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#else
  /* In Color QuickDraw, set ForeColor and BackColor as follows to avoid
     color mapping in CopyBits.  Otherwise, it will be slow.  */
  ForeColor (blackColor);
  BackColor (whiteColor);
  CopyBits (&(w->portBits), &(w->portBits), &src_r, &dest_r, srcCopy, 0);
  
  mac_set_colors (gc);
#endif
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#endif /* not TARGET_API_MAC_CARBON */
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}


/* Mac replacement for XCopyArea: dest must be Pixmap.  */

static void
mac_copy_area_to_pixmap (display, src, dest, gc, src_x, src_y, width, height, 
                     dest_x, dest_y)
     Display *display;
     Pixmap src;
     Pixmap dest;
     GC gc;
     int src_x, src_y;
     unsigned int width, height;
     int dest_x, dest_y;
{
  Rect src_r, dest_r;
  int src_right = ((PixMap *) src)->bounds.right;
  int src_bottom = ((PixMap *) src)->bounds.bottom;
  int w = src_right - src_x;
  int h = src_bottom - src_y;

  mac_set_colors (gc);
    
  SetRect (&src_r, src_x, src_y, src_right, src_bottom);
  SetRect (&dest_r, dest_x, dest_y, dest_x + w, dest_y + h);

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  CopyBits ((BitMap *) &src, (BitMap *) &dest, &src_r, &dest_r, srcCopy, 0);
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}


/* Mac replacement for XChangeGC.  */

static void
XChangeGC (void * ignore, XGCValues* gc, unsigned long mask,
                XGCValues *xgcv)
{
  if (mask & GCForeground)
    gc->foreground = xgcv->foreground;
  if (mask & GCBackground)
    gc->background = xgcv->background;
  if (mask & GCFont)
    gc->font = xgcv->font;
}


/* Mac replacement for XCreateGC.  */

XGCValues *
XCreateGC (void * ignore, Window window, unsigned long mask,
                      XGCValues *xgcv)
{
  XGCValues *gc = (XGCValues *) xmalloc (sizeof (XGCValues));
  bzero (gc, sizeof (XGCValues));

  XChangeGC (ignore, gc, mask, xgcv);

  return gc;
}


/* Used in xfaces.c.  */

void
XFreeGC (display, gc)
     Display *display;
     GC gc;
{
  xfree (gc);
}


/* Mac replacement for XGetGCValues.  */

static void
XGetGCValues (void* ignore, XGCValues *gc,
                   unsigned long mask, XGCValues *xgcv)
{
  XChangeGC (ignore, xgcv, mask, gc);
}


/* Mac replacement for XSetForeground.  */

static void
XSetForeground (display, gc, color)
     Display *display;
     GC gc;
     unsigned long color;
{
  gc->foreground = color;
}


/* Mac replacement for XSetFont.  */

static void
XSetFont (display, gc, font)
     Display *display;
     GC gc;
     XFontStruct *font;
{
  gc->font = font;
}


static void
XTextExtents16 (XFontStruct *font, XChar2b *text, int nchars,
                     int *direction,int *font_ascent,
                     int *font_descent, XCharStruct *cs)
{
  /* MAC_TODO: Use GetTextMetrics to do this and inline it below. */
}


/* x_sync is a no-op on Mac.  */
void
x_sync (f)
     void *f;
{
}


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/* Remove calls to XFlush by defining XFlush to an empty replacement.
   Calls to XFlush should be unnecessary because the X output buffer
   is flushed automatically as needed by calls to XPending,
   XNextEvent, or XWindowEvent according to the XFlush man page.
   XTread_socket calls XPending.  Removing XFlush improves
   performance.  */

#if TARGET_API_MAC_CARBON
#define XFlush(DISPLAY) QDFlushPortBuffer (GetQDGlobalsThePort (), NULL)
#else
#define XFlush(DISPLAY)	(void) 0 
#endif

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/* Flush display of frame F, or of all frames if F is null.  */

void
x_flush (f)
     struct frame *f;
{
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#if TARGET_API_MAC_CARBON
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  BLOCK_INPUT;
  if (f == NULL)
    {
      Lisp_Object rest, frame;
      FOR_EACH_FRAME (rest, frame)
	x_flush (XFRAME (frame));
    }
  else if (FRAME_X_P (f))
    XFlush (FRAME_MAC_DISPLAY (f));
  UNBLOCK_INPUT;
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#endif /* TARGET_API_MAC_CARBON */
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}



/* Return the struct mac_display_info corresponding to DPY.  There's
   only one.  */

struct mac_display_info *
mac_display_info_for_display (dpy)
     Display *dpy;
{
  return &one_mac_display_info;
}



/***********************************************************************
		    Starting and ending an update
 ***********************************************************************/
									
/* Start an update of frame F.  This function is installed as a hook
   for update_begin, i.e. it is called when update_begin is called.
   This function is called prior to calls to x_update_window_begin for
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   each window being updated.  */
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static void
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x_update_begin (f)
     struct frame *f;
{
  /* Nothing to do.  */
}


/* Start update of window W.  Set the global variable updated_window
   to the window being updated and set output_cursor to the cursor
   position of W.  */

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static void
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x_update_window_begin (w)
     struct window *w;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  struct mac_display_info *display_info = FRAME_MAC_DISPLAY_INFO (f);
  
  updated_window = w;
  set_output_cursor (&w->cursor);

  BLOCK_INPUT;

  if (f == display_info->mouse_face_mouse_frame)
    {
      /* Don't do highlighting for mouse motion during the update.  */
      display_info->mouse_face_defer = 1;

      /* If F needs to be redrawn, simply forget about any prior mouse
	 highlighting.  */
      if (FRAME_GARBAGED_P (f))
	display_info->mouse_face_window = Qnil;

#if 0 /* Rows in a current matrix containing glyphs in mouse-face have
	 their mouse_face_p flag set, which means that they are always
	 unequal to rows in a desired matrix which never have that
	 flag set.  So, rows containing mouse-face glyphs are never
	 scrolled, and we don't have to switch the mouse highlight off
	 here to prevent it from being scrolled.  */
      
      /* Can we tell that this update does not affect the window
	 where the mouse highlight is?  If so, no need to turn off.
	 Likewise, don't do anything if the frame is garbaged;
	 in that case, the frame's current matrix that we would use
	 is all wrong, and we will redisplay that line anyway.  */
      if (!NILP (display_info->mouse_face_window)
	  && w == XWINDOW (display_info->mouse_face_window))
	{
	  int i;

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          for (i = 0; i < w->desired_matrix->nrows; ++i)
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	    if (MATRIX_ROW_ENABLED_P (w->desired_matrix, i))
	      break;

	  if (i < w->desired_matrix->nrows)
	    clear_mouse_face (display_info);
	}
#endif /* 0 */
    }

  UNBLOCK_INPUT;
}


/* Draw a vertical window border to the right of window W if W doesn't
   have vertical scroll bars.  */

static void
x_draw_vertical_border (w)
     struct window *w;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  
  /* Redraw borders between horizontally adjacent windows.  Don't
     do it for frames with vertical scroll bars because either the
     right scroll bar of a window, or the left scroll bar of its
     neighbor will suffice as a border.  */
  if (!WINDOW_RIGHTMOST_P (w)
      && !FRAME_HAS_VERTICAL_SCROLL_BARS (f))
    {
      int x0, x1, y0, y1;

      window_box_edges (w, -1, &x0, &y0, &x1, &y1);
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      x1 += FRAME_X_RIGHT_FRINGE_WIDTH (f);
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      y1 -= 1;
      
      XDrawLine (FRAME_MAC_DISPLAY (f), FRAME_MAC_WINDOW (f), 
		 f->output_data.mac->normal_gc, x1, y0, x1, y1);
    }
}
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/* End update of window W (which is equal to updated_window).

   Draw vertical borders between horizontally adjacent windows, and
   display W's cursor if CURSOR_ON_P is non-zero.

   MOUSE_FACE_OVERWRITTEN_P non-zero means that some row containing
   glyphs in mouse-face were overwritten.  In that case we have to
   make sure that the mouse-highlight is properly redrawn.

   W may be a menu bar pseudo-window in case we don't have X toolkit
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   support. Such windows don't have a cursor, so don't display it
   here. */
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static void
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x_update_window_end (w, cursor_on_p, mouse_face_overwritten_p)
     struct window *w;
     int cursor_on_p, mouse_face_overwritten_p;
{
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  struct mac_display_info *dpyinfo
    = FRAME_MAC_DISPLAY_INFO (XFRAME (w->frame));

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  if (!w->pseudo_window_p)
    {
      BLOCK_INPUT;

      if (cursor_on_p)
	x_display_and_set_cursor (w, 1, output_cursor.hpos,
				  output_cursor.vpos,
				  output_cursor.x, output_cursor.y);
      
      x_draw_vertical_border (w);
      UNBLOCK_INPUT;
    }
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  /* If a row with mouse-face was overwritten, arrange for
     XTframe_up_to_date to redisplay the mouse highlight.  */
  if (mouse_face_overwritten_p)
    {
      dpyinfo->mouse_face_beg_row = dpyinfo->mouse_face_beg_col = -1;
      dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_end_col = -1;
      dpyinfo->mouse_face_window = Qnil;
    }

#if 0
  /* Unhide the caret.  This won't actually show the cursor, unless it
     was visible before the corresponding call to HideCaret in
     x_update_window_begin.  */
  if (w32_use_visible_system_caret)
    SendMessage (w32_system_caret_hwnd, WM_EMACS_SHOW_CARET, 0, 0);
#endif

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  updated_window = NULL;
}


/* End update of frame F.  This function is installed as a hook in
   update_end.  */

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static void
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x_update_end (f)
     struct frame *f;
{
  /* Reset the background color of Mac OS Window to that of the frame after
     update so that it is used by Mac Toolbox to clear the update region before
     an update event is generated.  */
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#if TARGET_API_MAC_CARBON
  SetPort (GetWindowPort (FRAME_MAC_WINDOW (f)));
#else
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  SetPort (FRAME_MAC_WINDOW (f));
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#endif

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  mac_set_backcolor (FRAME_BACKGROUND_PIXEL (f));
  
  /* Mouse highlight may be displayed again.  */
  FRAME_MAC_DISPLAY_INFO (f)->mouse_face_defer = 0;

  BLOCK_INPUT;
  XFlush (FRAME_MAC_DISPLAY (f));
  UNBLOCK_INPUT;
}


/* This function is called from various places in xdisp.c whenever a
   complete update has been performed.  The global variable
   updated_window is not available here.  */

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static void
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XTframe_up_to_date (f)
     struct frame *f;
{
  if (FRAME_X_P (f))
    {
      struct mac_display_info *dpyinfo = FRAME_MAC_DISPLAY_INFO (f);

      if (dpyinfo->mouse_face_deferred_gc
	  || f == dpyinfo->mouse_face_mouse_frame)
	{
	  BLOCK_INPUT;
	  if (dpyinfo->mouse_face_mouse_frame)
	    note_mouse_highlight (dpyinfo->mouse_face_mouse_frame,
				  dpyinfo->mouse_face_mouse_x,
				  dpyinfo->mouse_face_mouse_y);
	  dpyinfo->mouse_face_deferred_gc = 0;
	  UNBLOCK_INPUT;
	}
    }
}


/* Draw truncation mark bitmaps, continuation mark bitmaps, overlay
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   arrow bitmaps, or clear the fringes if no bitmaps are required
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   before DESIRED_ROW is made current.  The window being updated is
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   found in updated_window.  This function is called from
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   update_window_line only if it is known that there are differences
   between bitmaps to be drawn between current row and DESIRED_ROW.  */

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static void
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x_after_update_window_line (desired_row)
     struct glyph_row *desired_row;
{
  struct window *w = updated_window;
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  struct frame *f;
  int width, height;

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  xassert (w);
  
  if (!desired_row->mode_line_p && !w->pseudo_window_p)
    {
      BLOCK_INPUT;
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      x_draw_row_fringe_bitmaps (w, desired_row);
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      UNBLOCK_INPUT;
    }
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  /* When a window has disappeared, make sure that no rest of
     full-width rows stays visible in the internal border.  Could
     check here if updated_window is the leftmost/rightmost window,
     but I guess it's not worth doing since vertically split windows
     are almost never used, internal border is rarely set, and the
     overhead is very small.  */
  if (windows_or_buffers_changed
      && desired_row->full_width_p
      && (f = XFRAME (w->frame),
	  width = FRAME_INTERNAL_BORDER_WIDTH (f),
	  width != 0)
      && (height = desired_row->visible_height,
	  height > 0))
    {
      int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));
      /* Internal border is drawn below the tool bar.  */
      if (WINDOWP (f->tool_bar_window)
	  && w == XWINDOW (f->tool_bar_window))
	y -= width;
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      BLOCK_INPUT;

      XClearArea (FRAME_MAC_DISPLAY (f), FRAME_MAC_WINDOW (f),
		  0, y, width, height, 0);
      XClearArea (FRAME_MAC_DISPLAY (f), FRAME_MAC_WINDOW (f),
		  f->output_data.mac->pixel_width - width, y,
		  width, height, 0);
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      UNBLOCK_INPUT;
    }
}


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/* Draw the bitmap WHICH in one of the left or right fringes of
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   window W.  ROW is the glyph row for which to display the bitmap; it
   determines the vertical position at which the bitmap has to be
   drawn.  */

static void
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x_draw_fringe_bitmap (w, row, which, left_p)
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     struct window *w;
     struct glyph_row *row;
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     enum fringe_bitmap_type which;
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     int left_p;
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{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  Display *display = FRAME_MAC_DISPLAY (f);
  WindowPtr window = FRAME_MAC_WINDOW (f);
  int x, y, wd, h, dy;
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  int b1, b2;
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  unsigned char *bits;
  BitMap bitmap;
  XGCValues gcv;
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  GC gc = f->output_data.mac->normal_gc;
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  struct face *face;

  /* Must clip because of partially visible lines.  */
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  x_clip_to_row (w, row, gc, 1);
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  /* Convert row to frame coordinates.  */
  y = WINDOW_TO_FRAME_PIXEL_Y (w, row->y);

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  switch (which)
    {
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    case NO_FRINGE_BITMAP:
      wd = 0;
      h = 0;
      break;

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    case LEFT_TRUNCATION_BITMAP:
      wd = left_width;
      h = left_height;
      bits = left_bits;
      break;
      
    case OVERLAY_ARROW_BITMAP:
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      wd = ov_width;
      h = ov_height;
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      bits = ov_bits;
      break;
      
    case RIGHT_TRUNCATION_BITMAP:
      wd = right_width;
      h = right_height;
      bits = right_bits;
      break;

    case CONTINUED_LINE_BITMAP:
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      wd = continued_width;
      h = continued_height;
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      bits = continued_bits;
      break;
      
    case CONTINUATION_LINE_BITMAP:
      wd = continuation_width;
      h = continuation_height;
      bits = continuation_bits;
      break;

    case ZV_LINE_BITMAP:
      wd = zv_width;
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      h = zv_height - (y % zv_period);
      bits = zv_bits + (y % zv_period);
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      break;

    default:
      abort ();
    }

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  /* Clip bitmap if too high.  */
  if (h > row->height)
    h = row->height;

  /* Set dy to the offset in the row to start drawing the bitmap.  */
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  dy = (row->height - h) / 2;

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  /* Draw the bitmap.  */
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  face = FACE_FROM_ID (f, FRINGE_FACE_ID);
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  PREPARE_FACE_FOR_DISPLAY (f, face);

  /* Clear left fringe if no bitmap to draw or if bitmap doesn't fill
     the fringe.  */
  b1 = -1;
  if (left_p)
    {
      if (wd > FRAME_X_LEFT_FRINGE_WIDTH (f))
	wd = FRAME_X_LEFT_FRINGE_WIDTH (f);
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
	   - (FRAME_X_LEFT_FRINGE_WIDTH (f) - wd) / 2);
      if (wd < FRAME_X_LEFT_FRINGE_WIDTH (f) || row->height > h)
	{
	  /* If W has a vertical border to its left, don't draw over it.  */
	  int border = ((XFASTINT (w->left) > 0
			 && !FRAME_HAS_VERTICAL_SCROLL_BARS (f))
			? 1 : 0);
	  b1 = (window_box_left (w, -1)
		- FRAME_X_LEFT_FRINGE_WIDTH (f)
		+ border);
	  b2 = (FRAME_X_LEFT_FRINGE_WIDTH (f) - border);
	}
    }
  else
    {
      if (wd > FRAME_X_RIGHT_FRINGE_WIDTH (f))
	wd = FRAME_X_RIGHT_FRINGE_WIDTH (f);
      x = (window_box_right (w, -1)
	   + (FRAME_X_RIGHT_FRINGE_WIDTH (f) - wd) / 2);
      /* Clear right fringe if no bitmap to draw of if bitmap doesn't fill
	 the fringe.  */
      if (wd < FRAME_X_RIGHT_FRINGE_WIDTH (f) || row->height > h)
	{
	  b1 = window_box_right (w, -1);
	  b2 = FRAME_X_RIGHT_FRINGE_WIDTH (f);
	}
    }

  if (b1 >= 0)
    {
      int header_line_height = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w);
      XGCValues gcv;
      gcv.foreground = face->background;

#if 0  /* MAC_TODO: stipple */
      /* In case the same realized face is used for fringes and
	 for something displayed in the text (e.g. face `region' on
	 mono-displays, the fill style may have been changed to
	 FillSolid in x_draw_glyph_string_background.  */
      if (face->stipple)
	XSetFillStyle (FRAME_X_DISPLAY (f), face->gc, FillOpaqueStippled);
      else
	XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->background);
#endif

      XFillRectangle (FRAME_MAC_DISPLAY (f), FRAME_MAC_WINDOW (f),
		      &gcv,
		      b1,
		      WINDOW_TO_FRAME_PIXEL_Y (w, max (header_line_height,
						       row->y)),
		      b2,
		      row->visible_height);

#if 0  /* MAC_TODO: stipple */
      if (!face->stipple)
	XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->foreground);
#endif
    }

  if (which == NO_FRINGE_BITMAP)
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    {
      mac_reset_clipping (display, window);
      return;
    }
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  mac_create_bitmap_from_bitmap_data (&bitmap, bits, wd, h);
  gcv.foreground = face->foreground;
  gcv.background = face->background;

  mac_draw_bitmap (display, window, &gcv, x, y + dy, &bitmap);

  mac_free_bitmap (&bitmap);
  mac_reset_clipping (display, window);
}


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/* Draw fringe bitmaps for glyph row ROW on window W.  Call this
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   function with input blocked.  */

static void
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x_draw_row_fringe_bitmaps (w, row)
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     struct window *w;
     struct glyph_row *row;
{
  struct frame *f = XFRAME (w->frame);
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  enum fringe_bitmap_type bitmap;
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  xassert (interrupt_input_blocked);

  /* If row is completely invisible, because of vscrolling, we
     don't have to draw anything.  */
  if (row->visible_height <= 0)
    return;

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  if (FRAME_X_LEFT_FRINGE_WIDTH (f) != 0)
    {
      /* Decide which bitmap to draw in the left fringe.  */
      if (row->overlay_arrow_p)
	bitmap = OVERLAY_ARROW_BITMAP;
      else if (row->truncated_on_left_p)
	bitmap = LEFT_TRUNCATION_BITMAP;
      else if (MATRIX_ROW_CONTINUATION_LINE_P (row))
	bitmap = CONTINUATION_LINE_BITMAP;
      else if (row->indicate_empty_line_p)
	bitmap = ZV_LINE_BITMAP;
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      else
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	bitmap = NO_FRINGE_BITMAP;
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      x_draw_fringe_bitmap (w, row, bitmap, 1);
    }
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  if (FRAME_X_RIGHT_FRINGE_WIDTH (f) != 0)
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    {
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      /* Decide which bitmap to draw in the right fringe.  */
      if (row->truncated_on_right_p)
	bitmap = RIGHT_TRUNCATION_BITMAP;
      else if (row->continued_p)
	bitmap = CONTINUED_LINE_BITMAP;
      else if (row->indicate_empty_line_p && FRAME_X_LEFT_FRINGE_WIDTH (f) == 0)
	bitmap = ZV_LINE_BITMAP;
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      else
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	bitmap = NO_FRINGE_BITMAP;
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      x_draw_fringe_bitmap (w, row, bitmap, 0);
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    }
}


/* This is called when starting Emacs and when restarting after
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   suspend.  When starting Emacs, no window is mapped.  And nothing
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   must be done to Emacs's own window if it is suspended (though that
   rarely happens).  */

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static void