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/* X Communication module for terminals which understand the X protocol.
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   Copyright (C) 1989, 93, 94, 95, 96, 1997, 1998, 1999, 2000, 2001
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   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
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the Free Software Foundation; either version 2, or (at your option)
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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
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
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/* New display code by Gerd Moellmann <gerd@gnu.org>.  */
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/* Xt features made by Fred Pierresteguy.  */

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#include <config.h>

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/* On 4.3 these lose if they come after xterm.h.  */
/* Putting these at the beginning seems to be standard for other .c files.  */
#include <signal.h>

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#include <stdio.h>

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#ifdef HAVE_X_WINDOWS

#include "lisp.h"
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#include "blockinput.h"
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/* Need syssignal.h for various externs and definitions that may be required
   by some configurations for calls to signal later in this source file.  */
#include "syssignal.h"

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/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"
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#include <X11/cursorfont.h>
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/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
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#endif /* makedev */
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#ifdef BSD_SYSTEM
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#include <sys/ioctl.h>
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#endif /* ! defined (BSD_SYSTEM) */
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#include "systty.h"
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#include "systime.h"
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#ifndef INCLUDED_FCNTL
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#include <fcntl.h>
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#endif
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#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
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/* Caused redefinition of DBL_DIG on Netbsd; seems not to be needed.  */
/* #include <sys/param.h>  */
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#include "charset.h"
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#include "coding.h"
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#include "ccl.h"
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#include "frame.h"
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#include "dispextern.h"
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#include "fontset.h"
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#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#if 0
#include "sink.h"
#include "sinkmask.h"
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#endif /* ! 0 */
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#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
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#include "window.h"
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#include "keyboard.h"
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#include "intervals.h"
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#include "process.h"
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#include "atimer.h"
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#ifdef USE_X_TOOLKIT
#include <X11/Shell.h>
#endif

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#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

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#ifdef USE_X_TOOLKIT
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extern void free_frame_menubar P_ ((struct frame *));
extern struct frame *x_menubar_window_to_frame P_ ((struct x_display_info *,
						    int));
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#if (XtSpecificationRelease >= 5) && !defined(NO_EDITRES)
#define HACK_EDITRES
extern void _XEditResCheckMessages ();
#endif /* not NO_EDITRES */
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/* Include toolkit specific headers for the scroll bar widget.  */

#ifdef USE_TOOLKIT_SCROLL_BARS
#if defined USE_MOTIF
#include <Xm/Xm.h>		/* for LESSTIF_VERSION */
#include <Xm/ScrollBar.h>
#include <Xm/ScrollBarP.h>
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#else /* !USE_MOTIF i.e. use Xaw */

#ifdef HAVE_XAW3D
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#include <X11/Xaw3d/Simple.h>
#include <X11/Xaw3d/Scrollbar.h>
#define ARROW_SCROLLBAR
#include <X11/Xaw3d/ScrollbarP.h>
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#else /* !HAVE_XAW3D */
#include <X11/Xaw/Simple.h>
#include <X11/Xaw/Scrollbar.h>
#endif /* !HAVE_XAW3D */
#ifndef XtNpickTop
#define XtNpickTop "pickTop"
#endif /* !XtNpickTop */
#endif /* !USE_MOTIF */
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#endif /* USE_TOOLKIT_SCROLL_BARS */

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#endif /* USE_X_TOOLKIT */

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#ifndef USE_X_TOOLKIT
#define x_any_window_to_frame x_window_to_frame
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#define x_top_window_to_frame x_window_to_frame
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#endif

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#ifdef USE_X_TOOLKIT
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#include "widget.h"
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#ifndef XtNinitialState
#define XtNinitialState "initialState"
#endif
#endif

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#ifndef min
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#define min(a,b) ((a) < (b) ? (a) : (b))
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#endif
#ifndef max
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#define max(a,b) ((a) > (b) ? (a) : (b))
#endif

#define abs(x)	((x) < 0 ? -(x) : (x))

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


/* Bitmaps for truncated lines.  */

enum bitmap_type
{
  NO_BITMAP,
  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
#define zv_height 8
static unsigned char zv_bits[] = {
   0x00, 0x00, 0x1e, 0x1e, 0x1e, 0x1e, 0x00, 0x00};

/* An arrow like this: `<-'.  */

#define left_width 8
#define left_height 8
static unsigned char left_bits[] = {
   0x18, 0x0c, 0x06, 0x3f, 0x3f, 0x06, 0x0c, 0x18};

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

#define right_width 8
#define right_height 8
static unsigned char right_bits[] = {
   0x18, 0x30, 0x60, 0xfc, 0xfc, 0x60, 0x30, 0x18};

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/* Marker for continued lines.  */

#define continued_width 8
#define continued_height 8
static unsigned char continued_bits[] = {
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   0x3c, 0x7c, 0xc0, 0xe4, 0xfc, 0x7c, 0x3c, 0x7c};

/* Marker for continuation lines.  */
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#define continuation_width 8
#define continuation_height 8
static unsigned char continuation_bits[] = {
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   0x3c, 0x3e, 0x03, 0x27, 0x3f, 0x3e, 0x3c, 0x3e};
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/* Overlay arrow bitmap.  */
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#if 0
/* A bomb.  */
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#define ov_width 8
#define ov_height 8
static unsigned char ov_bits[] = {
   0x30, 0x08, 0x3c, 0x7e, 0x7a, 0x7a, 0x62, 0x3c};
#else
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/* A triangular arrow.  */
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#define ov_width 8
#define ov_height 8
static unsigned char ov_bits[] = {
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   0x03, 0x0f, 0x1f, 0x3f, 0x3f, 0x1f, 0x0f, 0x03};

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#endif
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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;
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static Lisp_Object help_echo_window;
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static Lisp_Object help_echo_object;
static int help_echo_pos;
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/* 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;

/* 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;

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

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struct x_display_info *x_display_list;
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/* 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.  */

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Lisp_Object x_display_name_list;
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/* Frame being updated by update_frame.  This is declared in term.c.
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   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.  */

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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.  */

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struct frame *pending_autoraise_frame;

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#ifdef USE_X_TOOLKIT
/* The application context for Xt use.  */
XtAppContext Xt_app_con;
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static String Xt_default_resources[] = {0};
#endif /* USE_X_TOOLKIT */
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/* Nominal cursor position -- where to draw output.  
   HPOS and VPOS are window relative glyph matrix coordinates.
   X and Y are window relative pixel coordinates.  */
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struct cursor_pos output_cursor;
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/* Non-zero means user is interacting with a toolkit scroll bar.  */

static int toolkit_scroll_bar_interaction;
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/* Mouse movement.

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   Formerly, we used PointerMotionHintMask (in standard_event_mask)
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   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.

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

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FRAME_PTR last_mouse_frame;
static XRectangle last_mouse_glyph;
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static Lisp_Object last_mouse_press_frame;

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

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   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
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   an ordinary motion.

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   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.  */

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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
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   doesn't seem to be any way to wrest the time-stamp from the server
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   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.  */
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static Time last_mouse_movement_time;

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

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

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/* Used locally within XTread_socket.  */
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static int x_noop_count;
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/* Initial values of argv and argc.  */
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extern char **initial_argv;
extern int initial_argc;
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extern Lisp_Object Vcommand_line_args, Vsystem_name;
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/* Tells if a window manager is present or not.  */
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extern Lisp_Object Vx_no_window_manager;
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extern Lisp_Object Qface, Qmouse_face;
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extern int errno;

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/* A mask of extra modifier bits to put into every keyboard char.  */
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extern int extra_keyboard_modifiers;

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static Lisp_Object Qvendor_specific_keysyms;

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extern XrmDatabase x_load_resources P_ ((Display *, char *, char *, char *));
extern Lisp_Object x_icon_type P_ ((struct frame *));
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/* 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
};

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static void x_set_window_size_1 P_ ((struct frame *, int, int, int));
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static const XColor *x_color_cells P_ ((struct frame *, int *));
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static void x_update_window_end P_ ((struct window *, int, int));
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static void frame_to_window_pixel_xy P_ ((struct window *, int *, int *));
void x_delete_display P_ ((struct x_display_info *));
static unsigned int x_x_to_emacs_modifiers P_ ((struct x_display_info *,
						unsigned));
static int fast_find_position P_ ((struct window *, int, int *, int *,
				   int *, int *));
static void set_output_cursor P_ ((struct cursor_pos *));
static struct glyph *x_y_to_hpos_vpos P_ ((struct window *, int, int,
					   int *, int *, int *));
static void note_mode_line_highlight P_ ((struct window *, int, int));
static void note_mouse_highlight P_ ((struct frame *, int, int));
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static void note_tool_bar_highlight P_ ((struct frame *f, int, int));
static void x_handle_tool_bar_click P_ ((struct frame *, XButtonEvent *));
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static void show_mouse_face P_ ((struct x_display_info *,
				 enum draw_glyphs_face));
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));
void x_initialize P_ ((void));
static void x_font_min_bounds P_ ((XFontStruct *, int *, int *));
static int x_compute_min_glyph_bounds P_ ((struct frame *));
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 *));
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static void x_draw_bar_cursor P_ ((struct window *, struct glyph_row *, int));
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static int x_intersect_rectangles P_ ((XRectangle *, XRectangle *,
				       XRectangle *));
static void expose_frame P_ ((struct frame *, int, int, int, int));
static void expose_window_tree P_ ((struct window *, XRectangle *));
static void expose_window P_ ((struct window *, XRectangle *));
static void expose_area P_ ((struct window *, struct glyph_row *,
			     XRectangle *, enum glyph_row_area));
static void expose_line P_ ((struct window *, struct glyph_row *,
			     XRectangle *));
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));
static void x_draw_bitmap P_ ((struct window *, struct glyph_row *, 
			       enum bitmap_type));

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 *, XRectangle *));
static void x_draw_row_bitmaps P_ ((struct window *, struct glyph_row *));
static void note_overwritten_text_cursor P_ ((struct window *, int, int));
static void x_flush P_ ((struct frame *f));
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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 *));

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

static void
x_flush (f)
     struct frame *f;
{
  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_X_DISPLAY (f));
  UNBLOCK_INPUT;
}

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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.  */

#define XFlush(DISPLAY)	(void) 0 
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/***********************************************************************
			      Debugging
 ***********************************************************************/

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#if 0
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/* This is a function useful for recording debugging information about
   the sequence of occurrences in this file.  */
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struct record 
{
  char *locus;
  int type;
};

struct record event_record[100];

int event_record_index;

record_event (locus, type)
     char *locus;
     int type;
{
  if (event_record_index == sizeof (event_record) / sizeof (struct record))
    event_record_index = 0;

  event_record[event_record_index].locus = locus;
  event_record[event_record_index].type = type;
  event_record_index++;
}

#endif /* 0 */
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/* Return the struct x_display_info corresponding to DPY.  */

struct x_display_info *
x_display_info_for_display (dpy)
     Display *dpy;
{
  struct x_display_info *dpyinfo;

  for (dpyinfo = x_display_list; dpyinfo; dpyinfo = dpyinfo->next)
    if (dpyinfo->display == dpy)
      return dpyinfo;
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  return 0;
}
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/***********************************************************************
		    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
   each window being updated.  Currently, there is nothing to do here
   because all interesting stuff is done on a window basis.  */
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static void
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x_update_begin (f)
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     struct frame *f;
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{
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  /* Nothing to do.  */
}
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/* 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
x_update_window_begin (w)
     struct window *w;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  struct x_display_info *display_info = FRAME_X_DISPLAY_INFO (f);
  
  updated_window = w;
  set_output_cursor (&w->cursor);
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  BLOCK_INPUT;
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  if (f == display_info->mouse_face_mouse_frame)
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    {
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      /* Don't do highlighting for mouse motion during the update.  */
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      display_info->mouse_face_defer = 1;
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      /* If F needs to be redrawn, simply forget about any prior mouse
	 highlighting.  */
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      if (FRAME_GARBAGED_P (f))
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	display_info->mouse_face_window = Qnil;

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#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.  */
      
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      /* 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))
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	{
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	  int i;
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	  for (i = 0; i < w->desired_matrix->nrows; ++i)
	    if (MATRIX_ROW_ENABLED_P (w->desired_matrix, i))
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	      break;

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

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

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static void
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x_draw_vertical_border (w)
     struct window *w;
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{
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  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;
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      window_box_edges (w, -1, &x0, &y0, &x1, &y1);
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      x1 += FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f);
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      y1 -= 1;
      
      XDrawLine (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), 
		 f->output_data.x->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
   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)
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     struct window *w;
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     int cursor_on_p, mouse_face_overwritten_p;
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{
  if (!w->pseudo_window_p)
    {
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      struct x_display_info *dpyinfo
	= FRAME_X_DISPLAY_INFO (XFRAME (w->frame));
      
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      BLOCK_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;
	}
      
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      if (cursor_on_p)
	x_display_and_set_cursor (w, 1, output_cursor.hpos,
				  output_cursor.vpos,
				  output_cursor.x, output_cursor.y);
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      x_draw_vertical_border (w);
      UNBLOCK_INPUT;
    }
  
  updated_window = NULL;
}
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/* End update of frame F.  This function is installed as a hook in
   update_end.  */

static void
x_update_end (f)
     struct frame *f;
{
  /* Mouse highlight may be displayed again.  */
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  FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 0;
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  BLOCK_INPUT;
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  XFlush (FRAME_X_DISPLAY (f));
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  UNBLOCK_INPUT;
}
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/* 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)
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     struct frame *f;
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{
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  if (FRAME_X_P (f))
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    {
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      struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
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      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;
	}
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    }
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}
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/* Draw truncation mark bitmaps, continuation mark bitmaps, overlay
   arrow bitmaps, or clear the areas where they would be displayed
   before DESIRED_ROW is made current.  The window being updated is
   found in updated_window.  This function It is called from
   update_window_line only if it is known that there are differences
   between bitmaps to be drawn between current row and DESIRED_ROW.  */

static void
x_after_update_window_line (desired_row)
     struct glyph_row *desired_row;
{
  struct window *w = updated_window;
  
  xassert (w);
  
  if (!desired_row->mode_line_p && !w->pseudo_window_p)
    {
      BLOCK_INPUT;
      x_draw_row_bitmaps (w, desired_row);

      /* When a window has disappeared, make sure that no rest of
	 full-width rows stays visible in the internal border.  */
      if (windows_or_buffers_changed)
	{
	  struct frame *f = XFRAME (w->frame);
	  int width = FRAME_INTERNAL_BORDER_WIDTH (f);
	  int height = desired_row->visible_height;
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	  int x = (window_box_right (w, -1)
		   + FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f));
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	  int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));

	  XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
		      x, y, width, height, False);
	}
      
      UNBLOCK_INPUT;
    }
}


/* Draw the bitmap WHICH in one of the areas to the left or right of
   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
x_draw_bitmap (w, row, which)
     struct window *w;
     struct glyph_row *row;
     enum bitmap_type which;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  Display *display = FRAME_X_DISPLAY (f);
  Window window = FRAME_X_WINDOW (f);
  int x, y, wd, h, dy;
  unsigned char *bits;
  Pixmap pixmap;
  GC gc = f->output_data.x->normal_gc;
  struct face *face;
  int depth = DefaultDepthOfScreen (FRAME_X_SCREEN (f));

  /* Must clip because of partially visible lines.  */
  x_clip_to_row (w, row, gc, 1);

  switch (which)
    {
    case LEFT_TRUNCATION_BITMAP:
      wd = left_width;
      h = left_height;
      bits = left_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
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	   - (FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - wd) / 2);
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      break;
      
    case OVERLAY_ARROW_BITMAP:
      wd = left_width;
      h = left_height;
      bits = ov_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
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	   - (FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - wd) / 2);
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      break;
      
    case RIGHT_TRUNCATION_BITMAP:
      wd = right_width;
      h = right_height;
      bits = right_bits;
      x = window_box_right (w, -1);
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      x += (FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f) - wd) / 2;
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      break;

    case CONTINUED_LINE_BITMAP:
      wd = right_width;
      h = right_height;
      bits = continued_bits;
      x = window_box_right (w, -1);
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      x += (FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f) - wd) / 2;
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      break;
      
    case CONTINUATION_LINE_BITMAP:
      wd = continuation_width;
      h = continuation_height;
      bits = continuation_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
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	   - (FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - wd) / 2);
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      break;

    case ZV_LINE_BITMAP:
      wd = zv_width;
      h = zv_height;
      bits = zv_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
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	   - (FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - wd) / 2);
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      break;

    default:
      abort ();
    }

  /* Convert to frame coordinates.  Set dy to the offset in the row to
     start drawing the bitmap.  */
  y = WINDOW_TO_FRAME_PIXEL_Y (w, row->y);
  dy = (row->height - h) / 2;

  /* Draw the bitmap.  I believe these small pixmaps can be cached
     by the server.  */
  face = FACE_FROM_ID (f, BITMAP_AREA_FACE_ID);
  pixmap = XCreatePixmapFromBitmapData (display, window, bits, wd, h,
					face->foreground,
					face->background, depth);
  XCopyArea (display, pixmap, window, gc, 0, 0, wd, h, x, y + dy);
  XFreePixmap (display, pixmap);
  XSetClipMask (display, gc, None);
}


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

static void
x_draw_row_bitmaps (w, row)
     struct window *w;
     struct glyph_row *row;
{
  struct frame *f = XFRAME (w->frame);
  enum bitmap_type bitmap;
  struct face *face;
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  int header_line_height = -1;
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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;

  face = FACE_FROM_ID (f, BITMAP_AREA_FACE_ID);
  PREPARE_FACE_FOR_DISPLAY (f, face);

  /* Decide which bitmap to draw at the left side.  */
  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;
  else
    bitmap = NO_BITMAP;

  /* Clear flags area if no bitmap to draw or if bitmap doesn't fill
     the flags area.  */
  if (bitmap == NO_BITMAP
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      || FRAME_FLAGS_BITMAP_WIDTH (f) < FRAME_X_LEFT_FLAGS_AREA_WIDTH (f)
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      || row->height > FRAME_FLAGS_BITMAP_HEIGHT (f))
    {
      /* 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);
      int left = window_box_left (w, -1);

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      if (header_line_height < 0)
	header_line_height = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w);
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      /* In case the same realized face is used for bitmap areas 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);
      
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      XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
		      face->gc,
		      (left
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		       - FRAME_X_LEFT_FLAGS_AREA_WIDTH (f)
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		       + border),
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		      WINDOW_TO_FRAME_PIXEL_Y (w, max (header_line_height,
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						       row->y)),
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		      FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - border,
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		      row->visible_height);
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      if (!face->stipple)
	XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->foreground);
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    }

  /* Draw the left bitmap.  */
  if (bitmap != NO_BITMAP)
    x_draw_bitmap (w, row, bitmap);

  /* Decide which bitmap to draw at the right side.  */
  if (row->truncated_on_right_p)
    bitmap = RIGHT_TRUNCATION_BITMAP;
  else if (row->continued_p)
    bitmap = CONTINUED_LINE_BITMAP;
  else
    bitmap = NO_BITMAP;

  /* Clear flags area if no bitmap to draw of if bitmap doesn't fill
     the flags area.  */
  if (bitmap == NO_BITMAP
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      || FRAME_FLAGS_BITMAP_WIDTH (f) < FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f)
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      || row->height > FRAME_FLAGS_BITMAP_HEIGHT (f))
    {
      int right = window_box_right (w, -1);

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      if (header_line_height < 0)
	header_line_height = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w);
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      /* In case the same realized face is used for bitmap areas 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);
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      XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
		      face->gc,
		      right,
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		      WINDOW_TO_FRAME_PIXEL_Y (w, max (header_line_height,
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						       row->y)),
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		      FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f),
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		      row->visible_height);
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      if (!face->stipple)
	XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->foreground);
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    }

  /* Draw the right bitmap.  */
  if (bitmap != NO_BITMAP)
    x_draw_bitmap (w, row, bitmap);
}

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/***********************************************************************
			  Line Highlighting
 ***********************************************************************/
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/* External interface to control of standout mode.  Not used for X
   frames.  Aborts when called.  */

static void
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XTreassert_line_highlight (new, vpos)
     int new, vpos;
{
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  abort ();
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}

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/* Call this when about to modify line at position VPOS and change
   whether it is highlighted.  Not used for X frames.  Aborts when
   called.  */
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static void
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x_change_line_highlight (new_highlight, vpos, y, first_unused_hpos)
     int new_highlight, vpos, y, first_unused_hpos;
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{
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  abort ();
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}

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

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/* This is called when exiting or suspending Emacs.  Exiting will make
   the X-windows go away, and suspending requires no action.  */
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static void
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XTreset_terminal_modes ()
{
}
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/***********************************************************************
			    Output Cursor
 ***********************************************************************/

/* Set the global variable output_cursor to CURSOR.  All cursor
   positions are relative to updated_window.  */
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static void
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set_output_cursor (cursor)
    struct cursor_pos *cursor;
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{
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  output_cursor.hpos = cursor->hpos;
  output_cursor.vpos = cursor->vpos;
  output_cursor.x = cursor->x;
  output_cursor.y = cursor->y;
}


/* Set a nominal cursor position.
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   HPOS and VPOS are column/row positions in a window glyph matrix.  X
   and Y are window text area relative pixel positions.
   
   If this is done during an update, updated_window will contain the
   window that is being updated and the position is the future output
   cursor position for that window.  If updated_window is null, use
   selected_window and display the cursor at the given position.  */

static void
XTcursor_to (vpos, hpos, y, x)
     int vpos, hpos, y, x;
{
  struct window *w;

  /* If updated_window is not set, work on selected_window.  */
  if (updated_window)
    w = updated_window;
  else
    w = XWINDOW (selected_window);
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  /* Set the output cursor.  */
  output_cursor.hpos = hpos;
  output_cursor.vpos = vpos;
  output_cursor.x = x;
  output_cursor.y = y;
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  /* If not called as part of an update, really display the cursor.
     This will also set the cursor position of W.  */
  if (updated_window == NULL)
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    {
      BLOCK_INPUT;
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      x_display_cursor (w, 1, hpos, vpos, x, y);
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      XFlush (FRAME_X_DISPLAY (SELECTED_FRAME ()));
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      UNBLOCK_INPUT;
    }
}
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/***********************************************************************
			   Display Iterator
 ***********************************************************************/

/* Function prototypes of this page.  */

static struct face *x_get_glyph_face_and_encoding P_ ((struct frame *,
						       struct glyph *,
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						       XChar2b *,
						       int *));
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static struct face *x_get_char_face_and_encoding P_ ((struct frame *, int,
						      int, XChar2b *, int));
static XCharStruct *x_per_char_metric P_ ((XFontStruct *, XChar2b *));
static void x_encode_char P_ ((int, XChar2b *, struct font_info *));
static void x_append_glyph P_ ((struct it *));
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static void x_append_composite_glyph P_ ((struct it *));
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static void x_append_stretch_glyph P_ ((struct it *it, Lisp_Object,
					int, int, double));
static void x_produce_glyphs P_ ((struct it *));
static void x_produce_image_glyph P_ ((struct it *it));
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/* Get metrics of character CHAR2B in FONT.  Value is null if CHAR2B
   is not contained in the font.  */
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static INLINE XCharStruct *
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x_per_char_metric (font, char2b)
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     XFontStruct *font;
     XChar2b *char2b;
{
  /* The result metric information.  */
  XCharStruct *pcm = NULL;
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  xassert (font && char2b);
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  if (font->per_char != NULL)
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    {
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      if (font->min_byte1 == 0 && font->max_byte1 == 0)
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	{
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	  /* min_char_or_byte2 specifies the linear character index
	     corresponding to the first element of the per_char array,
	     max_char_or_byte2 is the index of the last character.  A
	     character with non-zero CHAR2B->byte1 is not in the font.
	     A character with byte2 less than min_char_or_byte2 or
	     greater max_char_or_byte2 is not in the font.  */
	  if (char2b->byte1 == 0
	      && char2b->byte2 >= font->min_char_or_byte2
	      && char2b->byte2 <= font->max_char_or_byte2)
	    pcm = font->per_char + char2b->byte2 - font->min_char_or_byte2;
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	}
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      else
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	{
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	  /* If either min_byte1 or max_byte1 are nonzero, both
	     min_char_or_byte2 and max_char_or_byte2 are less than
	     256, and the 2-byte character index values corresponding
	     to the per_char array element N (counting from 0) are:

	     byte1 = N/D + min_byte1
	     byte2 = N\D + min_char_or_byte2

	     where:

	     D = max_char_or_byte2 - min_char_or_byte2 + 1
	     / = integer division
	     \ = integer modulus  */
	  if (char2b->byte1 >= font->min_byte1
	      && char2b->byte1 <= font->max_byte1
	      && char2b->byte2 >= font->min_char_or_byte2
	      && char2b->byte2 <= font->max_char_or_byte2)
	    {
	      pcm = (font->per_char
		     + ((font->max_char_or_byte2 - font->min_char_or_byte2 + 1)
			* (char2b->byte1 - font->min_byte1))
		     + (char2b->byte2 - font->min_char_or_byte2));
	    }
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	}
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    }
  else
    {
      /* If the per_char pointer is null, all glyphs between the first
	 and last character indexes inclusive have the same
	 information, as given by both min_bounds and max_bounds.  */
      if (char2b->byte2 >= font->min_char_or_byte2
	  && char2b->byte2 <= font->max_char_or_byte2)
	pcm = &font->max_bounds;
    }
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  return ((pcm == NULL
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	   || (pcm->width == 0 && (pcm->rbearing - pcm->lbearing) == 0))
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	  ? NULL : pcm);
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}
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/* Encode CHAR2B using encoding information from FONT_INFO.  CHAR2B is
   the two-byte form of C.  Encoding is returned in *CHAR2B.  */
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static INLINE void
x_encode_char (c, char2b, font_info)
     int c;
     XChar2b *char2b;
     struct font_info *font_info;
{
  int charset = CHAR_CHARSET (c);
  XFontStruct *font = font_info->font;

  /* FONT_INFO may define a scheme by which to encode byte1 and byte2.
     This may be either a program in a special encoder language or a
     fixed encoding.  */
  if (font_info->font_encoder)
    {
      /* It's a program.  */
      struct ccl_program *ccl = font_info->font_encoder;

      if (CHARSET_DIMENSION (charset) == 1)
	{
	  ccl->reg[0] = charset;
	  ccl->reg[1] = char2b->byte2;
	}
      else
	{
	  ccl->reg[0] = charset;
	  ccl->reg[1] = char2b->byte1;
	  ccl->reg[2] = char2b->byte2;
	}
      
      ccl_driver (ccl, NULL, NULL, 0, 0, NULL);
      
      /* We assume that MSBs are appropriately set/reset by CCL
	 program.  */
      if (font->max_byte1 == 0)	/* 1-byte font */
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	char2b->byte1 = 0, char2b->byte2 = ccl->reg[1];
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      else
	char2b->byte1 = ccl->reg[1], char2b->byte2 = ccl->reg[2];
    }
  else if (font_info->encoding[charset])
    {
      /* Fixed encoding scheme.  See fontset.h for the meaning of the
	 encoding numbers.  */
      int enc = font_info->encoding[charset];
      
      if ((enc == 1 || enc == 2)
	  && CHARSET_DIMENSION (charset) == 2)
	char2b->byte1 |= 0x80;
      
      if (enc == 1 || enc == 3)
	char2b->byte2 |= 0x80;
    }
}


/* Get face and two-byte form of character C in face FACE_ID on frame
   F.  The encoding of C is returned in *CHAR2B.  MULTIBYTE_P non-zero
   means we want to display multibyte text.  Value is a pointer to a
   realized face that is ready for display.  */

static INLINE struct face *
x_get_char_face_and_encoding (f, c, face_id, char2b, multibyte_p)
     struct frame *f;
     int c, face_id;
     XChar2b *char2b;
     int multibyte_p;
{
  struct face *face = FACE_FROM_ID (f, face_id);

  if (!multibyte_p)
    {
      /* Unibyte case.  We don't have to encode, but we have to make
	 sure to use a face suitable for unibyte.  */
      char2b->byte1 = 0;
      char2b->byte2 = c;
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      face_id = FACE_FOR_CHAR (f, face, c);
      face = FACE_FROM_ID (f, face_id);
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    }
  else if (c < 128 && face_id < BASIC_FACE_ID_SENTINEL)
    {
      /* Case of ASCII in a face known to fit ASCII.  */
      char2b->byte1 = 0;
      char2b->byte2 = c;
    }
  else
    {
      int c1, c2, charset;
      
      /* Split characters into bytes.  If c2 is -1 afterwards, C is
	 really a one-byte character so that byte1 is zero.  */
      SPLIT_CHAR (c, charset, c1, c2);
      if (c2 > 0)
	char2b->byte1 = c1, char2b->byte2 = c2;
      else
	char2b->byte1 = 0, char2b->byte2 = c1;

      /* Maybe encode the character in *CHAR2B.  */
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      if (face->font != NULL)
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	{
	  struct font_info *font_info
	    = FONT_INFO_FROM_ID (f, face->font_info_id);
	  if (font_info)
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	    x_encode_char (c, char2b, font_info);
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	}
    }

  /* Make sure X resources of the face are allocated.  */
  xassert (face != NULL);
  PREPARE_FACE_FOR_DISPLAY (f, face);
  
  return face;
}


/* Get face and two-byte form of character glyph GLYPH on frame F.
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   The encoding of GLYPH->u.ch is returned in *CHAR2B.  Value is
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   a pointer to a realized face that is ready for display.  */

static INLINE struct face *
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x_get_glyph_face_and_encoding (f, glyph, char2b, two_byte_p)
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     struct frame *f;
     struct glyph *glyph;
     XChar2b *char2b;
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     int *two_byte_p;
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{
  struct face *face;

  xassert (glyph->type == CHAR_GLYPH);
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  face = FACE_FROM_ID (f, glyph->face_id);
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  if (two_byte_p)
    *two_byte_p = 0;

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  if (!glyph->multibyte_p)
    {
      /* Unibyte case.  We don't have to encode, but we have to make
	 sure to use a face suitable for unibyte.  */
      char2b->byte1 = 0;