w32term.c 278 KB
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/* Implementation of GUI terminal on the Microsoft W32 API.
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   Copyright (C) 1989, 93, 94, 95, 96, 1997, 1998, 1999, 2000
   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
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along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.  */
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#include <config.h>
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#include <signal.h>
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#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"

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#include "w32heap.h"
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#include "w32term.h"
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#include "w32bdf.h"
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#include <shellapi.h>
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#include "systty.h"
#include "systime.h"
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#include "atimer.h"
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#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>

#include "frame.h"
#include "dispextern.h"
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#include "fontset.h"
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#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
#include "window.h"
#include "keyboard.h"
#include "intervals.h"
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#include "composite.h"
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#include "coding.h"
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#undef min
#undef max
#define min(x, y) (((x) < (y)) ? (x) : (y))
#define max(x, y) (((x) > (y)) ? (x) : (y))

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#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
};

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enum w32_char_font_type
{
  UNKNOWN_FONT,
  ANSI_FONT,
  UNICODE_FONT,
  BDF_FONT
};

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/* Bitmaps are all unsigned short, as Windows requires bitmap data to
   be Word aligned.  For some reason they are horizontally reflected
   compared to how they appear on X, so changes in xterm.c should be
   reflected here.  */

/* 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 short zv_bits[] = {
   0x00, 0x00, 0x78, 0x78, 0x78, 0x78, 0x00, 0x00};
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static HBITMAP zv_bmp;
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/* An arrow like this: `<-'.  */

#define left_width 8
#define left_height 8
static unsigned short left_bits[] = {
   0x18, 0x30, 0x60, 0xfc, 0xfc, 0x60, 0x30, 0x18};
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static HBITMAP left_bmp;
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/* Right truncation arrow bitmap `->'.  */

#define right_width 8
#define right_height 8
static unsigned short right_bits[] = {
   0x18, 0x0c, 0x06, 0x3f, 0x3f, 0x06, 0x0c, 0x18};
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static HBITMAP right_bmp;
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/* Marker for continued lines.  */

#define continued_width 8
#define continued_height 8
static unsigned short continued_bits[] = {
   0x3c, 0x3e, 0x03, 0x27, 0x3f, 0x3e, 0x3c, 0x3e};
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static HBITMAP continued_bmp;
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/* Marker for continuation lines.  */

#define continuation_width 8
#define continuation_height 8
static unsigned short continuation_bits[] = {
   0x3c, 0x7c, 0xc0, 0xe4, 0xfc, 0x7c, 0x3c, 0x7c};
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static HBITMAP continuation_bmp;
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/* Overlay arrow bitmap.  */

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


/* Non-zero means Emacs uses toolkit scroll bars.  */

int x_toolkit_scroll_bars_p;

/* If a string, w32_read_socket generates an event to display that string.
   (The display is done in read_char.)  */
   
static Lisp_Object help_echo;

/* Temporary variable for w32_read_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;

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extern unsigned int msh_mousewheel;

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extern void free_frame_menubar ();

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extern void w32_menu_display_help (HMENU menu, UINT menu_item, UINT flags);

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extern int w32_codepage_for_font (char *fontname);

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extern Lisp_Object Vwindow_system;

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#define x_any_window_to_frame x_window_to_frame
#define x_top_window_to_frame x_window_to_frame


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/* This is display since w32 does not support multiple ones.  */
struct w32_display_info one_w32_display_info;
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/* This is a list of cons cells, each of the form (NAME . FONT-LIST-CACHE),
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   one for each element of w32_display_list and in the same order.
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   NAME is the name of the frame.
   FONT-LIST-CACHE records previous values returned by x-list-fonts.  */
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Lisp_Object w32_display_name_list;
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/* Frame being updated by update_frame.  This is declared in term.c.
   This is set by update_begin and looked at by all the
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   w32 functions.  It is zero while not inside an update.
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   In that case, the w32 functions assume that `SELECTED_FRAME ()'
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   is the frame to apply to.  */
extern struct frame *updating_frame;

/* This is a frame waiting to be autoraised, within w32_read_socket.  */
struct frame *pending_autoraise_frame;

/* Nominal cursor position -- where to draw output.
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   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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/* Flag to enable Unicode output in case users wish to use programs
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   like Twinbridge on '95 rather than installed system level support
   for Far East languages.  */
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int w32_enable_unicode_output;
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DWORD dwWindowsThreadId = 0;
HANDLE hWindowsThread = NULL;
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DWORD dwMainThreadId = 0;
HANDLE hMainThread = NULL;

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#ifndef SIF_ALL
/* These definitions are new with Windows 95. */
#define SIF_RANGE           0x0001
#define SIF_PAGE            0x0002
#define SIF_POS             0x0004
#define SIF_DISABLENOSCROLL 0x0008
#define SIF_TRACKPOS        0x0010
#define SIF_ALL             (SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS)

typedef struct tagSCROLLINFO
{
    UINT    cbSize;
    UINT    fMask;
    int     nMin;
    int     nMax;
    UINT    nPage;
    int     nPos;
    int     nTrackPos;
}   SCROLLINFO, FAR *LPSCROLLINFO;
typedef SCROLLINFO CONST FAR *LPCSCROLLINFO;
#endif /* SIF_ALL */

/* Dynamic linking to new proportional scroll bar functions. */
int (PASCAL *pfnSetScrollInfo) (HWND hwnd, int fnBar, LPSCROLLINFO lpsi, BOOL fRedraw);
BOOL (PASCAL *pfnGetScrollInfo) (HWND hwnd, int fnBar, LPSCROLLINFO lpsi);

int vertical_scroll_bar_min_handle;
int vertical_scroll_bar_top_border;
int vertical_scroll_bar_bottom_border;

int last_scroll_bar_drag_pos;

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/* Mouse movement. */

/* Where the mouse was last time we reported a mouse event.  */
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FRAME_PTR last_mouse_frame;
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static RECT last_mouse_glyph;
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static Lisp_Object last_mouse_press_frame;
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Lisp_Object Vw32_num_mouse_buttons;
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Lisp_Object Vw32_swap_mouse_buttons;
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/* Control whether x_raise_frame also sets input focus.  */
Lisp_Object Vw32_grab_focus_on_raise;

/* Control whether Caps Lock affects non-ascii characters.  */
Lisp_Object Vw32_capslock_is_shiftlock;

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/* Control whether right-alt and left-ctrl should be recognized as AltGr.  */
Lisp_Object Vw32_recognize_altgr;

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

   If the last motion event occurred in a scroll bar, we set this
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   so w32_mouse_position can know whether to report a scroll bar motion or
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   an ordinary motion.

   If the last motion event didn't occur in a scroll bar, we set this
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   to Qnil, to tell w32_mouse_position to return an ordinary motion event.  */
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static Lisp_Object last_mouse_scroll_bar;
static int last_mouse_scroll_bar_pos;
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/* This is a hack.  We would really prefer that w32_mouse_position would
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   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;

/* Incremented by w32_read_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

extern Lisp_Object Vcommand_line_args, Vsystem_name;

extern Lisp_Object Qface, Qmouse_face;

extern int errno;

/* 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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/* 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
};

static void x_update_window_end P_ ((struct window *, int));
static void frame_to_window_pixel_xy P_ ((struct window *, int *, int *));
void w32_delete_display P_ ((struct w32_display_info *));
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 x_check_font P_ ((struct frame *, XFontStruct *));
static void note_mouse_highlight P_ ((struct frame *, int, int));
static void note_tool_bar_highlight P_ ((struct frame *f, int, int));
static void w32_handle_tool_bar_click P_ ((struct frame *,
                                          struct input_event *));
static void show_mouse_face P_ ((struct w32_display_info *,
				 enum draw_glyphs_face));
void clear_mouse_face P_ ((struct w32_display_info *));

void x_lower_frame P_ ((struct frame *));
void x_scroll_bar_clear P_ ((struct frame *));
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 w32_initialize P_ ((void));
static void x_font_min_bounds P_ ((XFontStruct *, int *, int *));
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 w32_frame_up_to_date P_ ((struct frame *));
static void w32_reassert_line_highlight P_ ((int, int));
static void x_change_line_highlight P_ ((int, int, int, int));
static void w32_set_terminal_modes P_ ((void));
static void w32_reset_terminal_modes P_ ((void));
static void w32_cursor_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 w32_new_focus_frame P_ ((struct w32_display_info *,
                                     struct frame *));
static void w32_frame_rehighlight P_ ((struct frame *));
static void x_frame_rehighlight P_ ((struct w32_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 w32_intersect_rectangles P_ ((RECT *, RECT *, RECT *));
static void expose_frame P_ ((struct frame *, int, int, int, int));
static void expose_window_tree P_ ((struct window *, RECT *));
static void expose_window P_ ((struct window *, RECT *));
static void expose_area P_ ((struct window *, struct glyph_row *,
			     RECT *, enum glyph_row_area));
static void expose_line P_ ((struct window *, struct glyph_row *,
			     RECT *));
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_cursor P_ ((struct window *w, int, int, int, int, int));
void x_display_and_set_cursor P_ ((struct window *, int, int, int, int, int));
static void w32_draw_bitmap P_ ((struct window *, HDC hdc, struct glyph_row *, 
                                 enum bitmap_type));
static int x_phys_cursor_in_rect_p P_ ((struct window *, RECT *));
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 w32_clip_to_row P_ ((struct window *, struct glyph_row *,
                               HDC, int));

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static Lisp_Object Qvendor_specific_keysyms;


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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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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;
}

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;
}

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

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

static void
w32_set_clip_rectangle (HDC hdc, RECT *rect)
{
  if (rect)
    {
      HRGN clip_region = CreateRectRgnIndirect (rect);
      SelectClipRgn (hdc, clip_region);
      DeleteObject (clip_region);
    }
  else
    SelectClipRgn (hdc, NULL);
}


/* Draw a hollow rectangle at the specified position.  */
void
w32_draw_rectangle (HDC hdc, XGCValues *gc, int x, int y,
                    int width, int height)
{
  HBRUSH hb, oldhb;
  HPEN hp, oldhp;

  hb = CreateSolidBrush (gc->background);
  hp = CreatePen (PS_SOLID, 0, gc->foreground);
  oldhb = SelectObject (hdc, hb);
  oldhp = SelectObject (hdc, hp);

  Rectangle (hdc, x, y, x + width, y + height);

  SelectObject (hdc, oldhb);
  SelectObject (hdc, oldhp);
  DeleteObject (hb);
  DeleteObject (hp);
}

/* Draw a filled rectangle at the specified position. */
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void 
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w32_fill_rect (f, hdc, pix, lprect)
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     FRAME_PTR f;
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     HDC hdc;
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     COLORREF pix;
     RECT * lprect;
{
  HBRUSH hb;
  RECT rect;
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  hb = CreateSolidBrush (pix);
  FillRect (hdc, lprect, hb);
  DeleteObject (hb);
}

void 
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w32_clear_window (f)
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     FRAME_PTR f;
{
  RECT rect;
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  HDC hdc = get_frame_dc (f);
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  GetClientRect (FRAME_W32_WINDOW (f), &rect);
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  w32_clear_rect (f, hdc, &rect);
  release_frame_dc (f, hdc);
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}


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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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  /* Nothing to do.  We have to do something though, otherwise the
     function gets optimized away and the hook is no longer valid. */
  struct frame *cf = f;
}
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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.  */

static void
x_update_window_begin (w)
     struct window *w;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  struct w32_display_info *display_info = FRAME_W32_DISPLAY_INFO (f);

  updated_window = w;
  set_output_cursor (&w->cursor);
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  BLOCK_INPUT;

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  /* Regenerate display palette before drawing if list of requested
     colors has changed. */
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  if (display_info->regen_palette)
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  {
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    w32_regenerate_palette (f);
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    display_info->regen_palette = FALSE;
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  }

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  if (f == display_info->mouse_face_mouse_frame)
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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;

      /* 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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	}
    }

  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))
    {
      RECT r;
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      HDC hdc;
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      window_box_edges (w, -1, &r.left, &r.top, &r.right, &r.bottom);
      r.left = r.right + FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f);
      r.right = r.left + 1;
      r.bottom -= 1;
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      hdc = get_frame_dc (f);
      w32_fill_rect (f, hdc, FRAME_FOREGROUND_PIXEL (f), r);
      release_frame_dc (f, hdc);
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    }
}
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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.  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.  */

static void
x_update_window_end (w, cursor_on_p)
     struct window *w;
     int cursor_on_p;
{
  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;
    }
  
  updated_window = NULL;
}

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

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static void
x_update_end (f)
     struct frame *f;
{
  /* Mouse highlight may be displayed again.  */
  FRAME_W32_DISPLAY_INFO (f)->mouse_face_defer = 0;
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}

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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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w32_frame_up_to_date (f)
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     struct frame *f;
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{
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  if (FRAME_W32_P (f))
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    {
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      struct w32_display_info *dpyinfo = FRAME_W32_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;
	}
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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;
	  int x = (window_box_right (w, -1)
                   + FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f));
	  int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));
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          HDC hdc = get_frame_dc (f);
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          w32_clear_area (f, hdc, x, y, width, height);
          release_frame_dc (f, hdc);
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	}
      
      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
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w32_draw_bitmap (w, hdc, row, which)
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     struct window *w;
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     HDC hdc;
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     struct glyph_row *row;
     enum bitmap_type which;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  Window window = FRAME_W32_WINDOW (f);
  HDC compat_hdc;
  int x, y, wd, h, dy;
  HBITMAP pixmap;
  HBRUSH fg_brush, orig_brush;
  HANDLE horig_obj;
  struct face *face;

  /* Must clip because of partially visible lines.  */
  w32_clip_to_row (w, row, hdc, 1);

  switch (which)
    {
    case LEFT_TRUNCATION_BITMAP:
      wd = left_width;
      h = left_height;
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      pixmap = left_bmp;
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      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
	   - (FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - wd) / 2);
      break;
      
    case OVERLAY_ARROW_BITMAP:
      wd = ov_width;
      h = ov_height;
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      pixmap = ov_bmp;
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      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
	   - (FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - wd) / 2);
      break;
      
    case RIGHT_TRUNCATION_BITMAP:
      wd = right_width;
      h = right_height;
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      pixmap = right_bmp;
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      x = window_box_right (w, -1);
      x += (FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f) - wd) / 2;
      break;

    case CONTINUED_LINE_BITMAP:
      wd = continued_width;
      h = continued_height;
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      pixmap = continued_bmp;
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      x = window_box_right (w, -1);
      x += (FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f) - wd) / 2;
      break;
      
    case CONTINUATION_LINE_BITMAP:
      wd = continuation_width;
      h = continuation_height;
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      pixmap = continuation_bmp;
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      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
	   - wd
	   - (FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - wd) / 2);
      break;

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

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

  compat_hdc = CreateCompatibleDC (hdc);
  SaveDC (hdc);
  fg_brush = CreateSolidBrush (FRAME_FOREGROUND_PIXEL (f));
  orig_brush = SelectObject (hdc, fg_brush);
  horig_obj = SelectObject (compat_hdc, pixmap);
  SetTextColor (hdc, FRAME_BACKGROUND_PIXEL (f));
  SetBkColor (hdc, FRAME_FOREGROUND_PIXEL (f));
#if 0 /* From w32bdf.c (which is from Meadow).  */
  BitBlt (hdc, x, y + dy, wd, h, compat_hdc, 0, 0, SRCCOPY);
#else
  BitBlt (hdc, x, y + dy, wd, h, compat_hdc, 0, 0, 0xB8074A);
#endif
  SelectObject (compat_hdc, horig_obj);
  SelectObject (hdc, orig_brush);
  DeleteObject (fg_brush);
  DeleteDC (compat_hdc);
  RestoreDC (hdc, -1);
}


/* 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;
  int header_line_height = -1;
  HDC hdc = get_frame_dc (f);

  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
      || FRAME_FLAGS_BITMAP_WIDTH (f) < FRAME_X_LEFT_FLAGS_AREA_WIDTH (f)
      || 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);

      if (header_line_height < 0)
	header_line_height = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w);
      
      w32_fill_area (f, hdc, face->background,
                     left - FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) + border,
                     WINDOW_TO_FRAME_PIXEL_Y (w, max (header_line_height,
                                                      row->y)),
                     FRAME_X_LEFT_FLAGS_AREA_WIDTH (f) - border,
                     row->visible_height);
    }

  /* Draw the left bitmap.  */
  if (bitmap != NO_BITMAP)
    w32_draw_bitmap (w, hdc, 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
      || FRAME_FLAGS_BITMAP_WIDTH (f) < FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f)
      || row->height > FRAME_FLAGS_BITMAP_HEIGHT (f))
    {
      int right = window_box_right (w, -1);

      if (header_line_height < 0)
	header_line_height = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w);

      w32_fill_area (f, hdc, face->background,
                     right,
                     WINDOW_TO_FRAME_PIXEL_Y (w, max (header_line_height,
                                                      row->y)),
                     FRAME_X_RIGHT_FLAGS_AREA_WIDTH (f),
                     row->visible_height);
    }

  /* Draw the right bitmap.  */
  if (bitmap != NO_BITMAP)
    w32_draw_bitmap (w, hdc, row, bitmap);

  release_frame_dc (f, hdc);
}

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/***********************************************************************
			  Line Highlighting
 ***********************************************************************/

/* External interface to control of standout mode. Not used for W32
   frames. Aborts when called.  */
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static void
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w32_reassert_line_highlight (new, vpos)
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     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 W32 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 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
w32_set_terminal_modes (void)
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{
}

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/* This is called when exiting or suspending Emacs. Exiting will make
   the W32 windows go away, and suspending requires no action. */
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static void
w32_reset_terminal_modes (void)
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{
}
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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
set_output_cursor (cursor)
    struct cursor_pos *cursor;
{
  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.

   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.  */
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static void
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w32_cursor_to (vpos, hpos, y, x)
     int vpos, hpos, y, x;
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{
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  struct window *w;
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  /* If updated_window is not set, work on selected_window.  */
  if (updated_window)
    w = updated_window;
  else
    w = XWINDOW (selected_window);

  /* 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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      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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						       wchar_t *,
                                                       int *));
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static struct face *x_get_char_face_and_encoding P_ ((struct frame *, int,
						      int, wchar_t *, int));
static XCharStruct *w32_per_char_metric P_ ((HDC hdc, XFontStruct *,
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                                             wchar_t *,
                                             enum w32_char_font_type));
static enum w32_char_font_type
  w32_encode_char P_ ((int, wchar_t *, struct font_info *, int *));
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static void x_append_glyph P_ ((struct it *));
static void x_append_composite_glyph P_ ((struct it *));
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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/* Dealing with bits of wchar_t as if they were an XChar2B.  */
#define BUILD_WCHAR_T(byte1, byte2) \
 ((wchar_t)((((byte1) & 0x00ff) << 8) | ((byte2) & 0x00ff)))
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#define BYTE1(ch) \
 (((ch) & 0xff00) >> 8)
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#define BYTE2(ch) \
 ((ch) & 0x00ff)
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/* NTEMACS_TODO: Add support for bdf fonts back in. */

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/* Get metrics of character CHAR2B in FONT.  Value is always non-null.
   If CHAR2B is not contained in FONT, the font's default character
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   metric is returned. */
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static XCharStruct *
w32_per_char_metric (hdc, font, char2b, font_type)
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     HDC hdc;
     XFontStruct *font;
     wchar_t *char2b;
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     enum w32_char_font_type font_type;
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{
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  /* The result metric information.  */
  XCharStruct *pcm;
  ABC char_widths;
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  SIZE sz;
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  BOOL retval;
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  xassert (font && char2b);
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  if (font_type == UNKNOWN_FONT)
    {
      if (font->bdf)
        font_type = BDF_FONT;
      else if (!w32_enable_unicode_output)
        font_type = ANSI_FONT;
      else
        font_type = UNICODE_FONT;  /* NTEMACS_TODO: Need encoding? */
    }

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  pcm = (XCharStruct *) xmalloc (sizeof (XCharStruct));
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  if (font->hfont)
    SelectObject (hdc, font->hfont);

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  if (font_type == UNICODE_FONT)
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    retval = GetCharABCWidthsW (hdc, *char2b, *char2b, &char_widths);
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  else if (font_type == ANSI_FONT)
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    retval = GetCharABCWidthsA (hdc, *char2b, *char2b, &char_widths);

  if (retval)
    {
      pcm->width = char_widths.abcA + char_widths.abcB + char_widths.abcC;
      pcm->lbearing = char_widths.abcA;
      pcm->rbearing = pcm->width - char_widths.abcC;
    }
  else
    {
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      /* Windows 9x does not implement GetCharABCWidthsW, so if that
         failed, try GetTextExtentPoint32W, which is implemented and
         at least gives us some of the info we are after (total
         character width). */
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      if (font_type == UNICODE_FONT)
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          retval = GetTextExtentPoint32W (hdc, char2b, 1, &sz);
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      if (retval)
        {
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          pcm->width = sz.cx;
          pcm->rbearing = sz.cx;
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          pcm->lbearing = 0;
        }
      else
        {
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          xfree (pcm);
          return NULL;
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        }
    }

  pcm->ascent = FONT_BASE (font);
  pcm->descent = FONT_DESCENT (font);

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  if (pcm->width == 0 && (pcm->rbearing - pcm->lbearing) == 0)
    {
      xfree (pcm);
      pcm = NULL;
    }

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  return pcm;
}


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/* Determine if a font is double byte. */
int w32_font_is_double_byte (XFontStruct *font)
{
  return font->double_byte_p;
}


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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 enum w32_char_font_type
w32_encode_char (c, char2b, font_info, two_byte_p)
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     int c;
     wchar_t *char2b;
     struct font_info *font_info;
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     int * two_byte_p;
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{
  int charset = CHAR_CHARSET (c);
  int codepage;
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  int unicode_p = 0;

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  XFontStruct *font = font_info->font;

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  xassert(two_byte_p);

  *two_byte_p = w32_font_is_double_byte (font);

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  /* 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] = BYTE2 (*char2b);
	}
      else
	{
	  ccl->reg[0] = charset;
	  ccl->reg[1] = BYTE1 (*char2b);
	  ccl->reg[2] = BYTE2 (*char2b);
	}

      ccl_driver (ccl, NULL, NULL, 0, 0, NULL);

      /* We assume that MSBs are appropriately set/reset by CCL
	 program.  */
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      if (!*two_byte_p)	/* 1-byte font */
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	*char2b = BUILD_WCHAR_T (0, ccl->reg[1]);
      else
	*char2b = BUILD_WCHAR_T (ccl->reg[1], 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 = BUILD_WCHAR_T (BYTE1 (*char2b) | 0x80, BYTE2 (*char2b));
      
      if (enc == 1 || enc == 3
          || (enc == 4 && CHARSET_DIMENSION (charset) == 1))
	*char2b = BUILD_WCHAR_T (BYTE1 (*char2b), BYTE2 (*char2b) | 0x80);
      else if (enc == 4)
        {
          int sjis1, sjis2;

          ENCODE_SJIS (BYTE1 (*char2b), BYTE2 (*char2b),
                       sjis1, sjis2);
          *char2b = BUILD_WCHAR_T (sjis1, sjis2);
        }
    }
  codepage = w32_codepage_for_font (font_info->name);

  /* If charset is not ASCII or Latin-1, may need to move it into
     Unicode space.  */
  if ( font && !font->bdf && w32_use_unicode_for_codepage (codepage)
       && charset != CHARSET_ASCII && charset != charset_latin_iso8859_1)
    {
      char temp[3];
      temp[0] = BYTE1 (*char2b);
      temp[1] = BYTE2 (*char2b);
      temp[2] = '\0';
      if (temp[0])
        MultiByteToWideChar (codepage, 0, temp, 2, char2b, 1);
      else
        MultiByteToWideChar (codepage, 0, temp+1, 1, char2b, 1);
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      unicode_p = 1;
      *two_byte_p = 1;
    }
  if (!font)
    return UNKNOWN_FONT;
  else if (font->bdf)
    return BDF_FONT;
  else if (unicode_p)
    return UNICODE_FONT;
  else
    return ANSI_FONT;
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}


/* 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;
     wchar_t *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 = BUILD_WCHAR_T (0, 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 = BUILD_WCHAR_T (0, 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 = BUILD_WCHAR_T (c1, c2);
      else
	*char2b = BUILD_WCHAR_T (0, 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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	      w32_encode_char (c, char2b, font_info, &multibyte_p);
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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.
   The encoding of GLYPH->u.ch is returned in *CHAR2B.  Value is
   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;
     wchar_t *char2b;
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     int *two_byte_p;
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{
  struct face *face;
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  int dummy = 0;
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  xassert (glyph->type == CHAR_GLYPH);
  face = FACE_FROM_ID (f, glyph->face_id);

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  if (two_byte_p)
    *two_byte_p = 0;
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  else
    two_byte_p = &dummy;
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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 = BUILD_WCHAR_T (0, glyph->u.ch);
    }
  else if (glyph->u.ch < 128
	   && glyph->face_id < BASIC_FACE_ID_SENTINEL)
    {
      /* Case of ASCII in a face known to fit ASCII.  */
      *char2b = BUILD_WCHAR_T (0, glyph->u.ch);
    }
  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 (glyph->u.ch, charset, c1, c2);
      if (c2 > 0)
	*char2b = BUILD_WCHAR_T (c1, c2);
      else
	*char2b = BUILD_WCHAR_T (0, c1);

      /* Maybe encode the character in *CHAR2B.  */
      if (charset != CHARSET_ASCII)
	{
	  struct font_info *font_info
	    = FONT_INFO_FROM_ID (f, face->font_info_id);
	  if (font_info)
	    {
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	      glyph->w32_font_type
                = w32_encode_char (glyph->u.ch, char2b, font_info, two_byte_p);
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	    }
	}
    }

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


/* Store one glyph for IT->char_to_display in IT->glyph_row.  
   Called from x_produce_glyphs when IT->glyph_row is non-null.  */

static INLINE void
x_append_glyph (it)
     struct it *it;
{
  struct glyph *glyph;
  enum glyph_row_area area = it->area;
  
  xassert (it->glyph_row);
  xassert (it->char_to_display != '\n' && it->char_to_display != '\t');
  
  glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
  if (glyph < it->glyph_row->glyphs[area + 1])
    {
      /* Play it safe.  If sub-structures of the glyph are not all the
	 same size, it otherwise be that some bits stay set.  This
	 would prevent a comparison with GLYPH_EQUAL_P.  */
      glyph->u.val = 0;
      
      glyph->type = CHAR_GLYPH;
      glyph->pixel_width = it->pixel_width;
      glyph->u.ch = it->char_to_display;
      glyph->face_id = it->face_id;
      glyph->charpos = CHARPOS (it->position);
      glyph->object = it->object;
      glyph->left_box_line_p = it->start_of_box_run_p;
      glyph->right_box_line_p = it->end_of_box_run_p;
      glyph->voffset = it->voffset;
      glyph->multibyte_p = it->multibyte_p;
      glyph->overlaps_vertically_p = (it->phys_ascent > it->ascent
				      || it->phys_descent > it->descent);
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      glyph->glyph_not_available_p = it->glyph_not_available_p;
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      ++it->glyph_row->used[area];
    }
}

/* Store one glyph for the composition IT->cmp_id in IT->glyph_row.  
   Called from x_produce_glyphs when IT->glyph_row is non-null.  */

static INLINE void
x_append_composite_glyph (it)
     struct it *it;
{
  struct glyph *glyph;
  enum glyph_row_area area = it->area;
  
  xassert (it->glyph_row);
  
  glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
  if (glyph < it->glyph_row->glyphs[area + 1])
    {
      /* Play it safe.  If sub-structures of the glyph are not all the
	 same size, it otherwise be that some bits stay set.  This
	 would prevent a comparison with GLYPH_EQUAL_P.  */
      glyph->u.val = 0;
      
      glyph->type = COMPOSITE_GLYPH;
      glyph->pixel_width = it->pixel_width;
      glyph->u.cmp_id = it->cmp_id;
      glyph->face_id = it->face_id;
      glyph->charpos = CHARPOS (it->position);
      glyph->object = it->object;
      glyph->left_box_line_p = it->start_of_box_run_p;
      glyph->right_box_line_p = it->end_of_box_run_p;
      glyph->voffset = it->voffset;
      glyph->multibyte_p = it->multibyte_p;
      glyph->overlaps_vertically_p = (it->phys_ascent > it->ascent
				      || it->phys_descent > it->descent);
      ++it->glyph_row->used[area];
    }
}


/* Change IT->ascent and IT->height according to the setting of
   IT->voffset.  */

static INLINE void
take_vertical_position_into_account (it)
     struct it *it;
{
  if (it->voffset)
    {
      if (it->voffset < 0)
	/* Increase the ascent so that we can display the text higher
	   in the line.  */
	it->ascent += abs (it->voffset);
      else
	/* Increase the descent so that we can display the text lower
	   in the line.  */
	it->descent += it->voffset;
    }
}


/* Produce glyphs/get display metrics for the image IT is loaded with.
   See the description of struct display_iterator in dispextern.h for
   an overview of struct display_iterator.  */

static void
x_produce_image_glyph (it)
     struct it *it;
{
  struct image *img;
  struct face *face;

  xassert (it->what == IT_IMAGE);

  face = FACE_FROM_ID (it->f, it->face_id);
  img = IMAGE_FROM_ID (it->f, it->image_id);
  xassert (img);

  /* Make sure X resources of the face and image are loaded.  */
  PREPARE_FACE_FOR_DISPLAY (it->f, face);
  prepare_image_for_display (it->f, img);

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  it->ascent = it->phys_ascent = image_ascent (img, face);
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