w32term.c 299 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, 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
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>

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#include "keyboard.h"
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#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 "intervals.h"
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#include "composite.h"
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#include "coding.h"
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#ifndef min
#define min(a,b) ((a) < (b) ? (a) : (b))
#endif
#ifndef max
#define max(a,b) ((a) > (b) ? (a) : (b))
#endif
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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
};

/* 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;


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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, w32_read_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 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 glyph_metric *w32_BDF_TextMetric(bdffont *fontp,
					unsigned char *text, int dim);
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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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struct w32_display_info *x_display_list;
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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;

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#ifndef USE_CRT_DLL
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extern int errno;
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#endif
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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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/* 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_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 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 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 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));
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static void w32_clip_to_row P_ ((struct window *, struct glyph_row *,
                                 HDC, int));
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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));

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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);
}

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;
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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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  /* Under certain conditions, this can be called at startup with
     a console frame pointer before the GUI frame is created. An HDC
     of 0 indicates this. */
  if (hdc)
    {
      GetClientRect (FRAME_W32_WINDOW (f), &rect);
      w32_clear_rect (f, hdc, &rect);
    }

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  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
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   each window being updated.  */
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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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  struct w32_display_info *display_info = FRAME_W32_DISPLAY_INFO (f);

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  if (! FRAME_W32_P (f))
    return;

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

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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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    }

  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);
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      w32_fill_rect (f, hdc, FRAME_FOREGROUND_PIXEL (f), &r);
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      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.

   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 w32_display_info *dpyinfo
        = FRAME_W32_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.  */

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static void
x_update_end (f)
     struct frame *f;
{
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  if (! FRAME_W32_P (f))
    return;

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  /* 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)
    {
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      struct frame *f;
      int width;

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      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.  */
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      if (windows_or_buffers_changed
          && (f = XFRAME (w->frame),
              width = FRAME_INTERNAL_BORDER_WIDTH (f),
              width != 0))
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	{
	  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;
  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);
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  horig_obj = SelectObject (compat_hdc, pixmap);
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  SetTextColor (hdc, face->background);
  SetBkColor (hdc, face->foreground);

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  BitBlt (hdc, x, y + dy, wd, h, compat_hdc, 0, 0, SRCCOPY);
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  SelectObject (compat_hdc, horig_obj);
  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;
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  HDC hdc;
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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;

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  hdc = get_frame_dc (f);

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  /* 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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  struct frame *f;

  if (updating_frame)
    f = updating_frame;
  else
    f = SELECTED_FRAME ();

  if (! FRAME_W32_P (f))
    return;

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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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  struct frame *f;

  if (updating_frame)
    f = updating_frame;
  else
    f = SELECTED_FRAME ();

  if (! FRAME_W32_P (f))
    return;

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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));
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static XCharStruct *w32_per_char_metric P_ ((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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/* 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 int
w32_bdf_per_char_metric (font, char2b, dim, pcm)
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     XFontStruct *font;
     wchar_t *char2b;
     int dim;
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     XCharStruct * pcm;
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{
  glyph_metric * bdf_metric;
  char buf[2];

  if (dim == 1)
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    buf[0] = (char)(*char2b);
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  else
    {
      buf[0] = BYTE1 (*char2b);
      buf[1] = BYTE2 (*char2b);
    }

  bdf_metric = w32_BDF_TextMetric (font->bdf, buf, dim);

  if (bdf_metric)
    {
      pcm->width = bdf_metric->dwidth;
      pcm->lbearing = bdf_metric->bbox;
      pcm->rbearing = bdf_metric->dwidth
                    - (bdf_metric->bbox + bdf_metric->bbw);
      pcm->ascent = bdf_metric->bboy + bdf_metric->bbh;
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      pcm->descent = -bdf_metric->bboy;
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      return 1;
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    }
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  return 0;
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}


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static int
w32_native_per_char_metric (font, char2b, font_type, pcm)
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     XFontStruct *font;
     wchar_t *char2b;
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     enum w32_char_font_type font_type;
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     XCharStruct * pcm;
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{
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  HDC hdc = GetDC (NULL);
  HFONT old_font;
  BOOL retval = FALSE;
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  xassert (font && char2b);
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  xassert (font->hfont);
  xassert (font_type == UNICODE_FONT || font_type == ANSI_FONT);
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  old_font = SelectObject (hdc, font->hfont);
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  if ((font->tm.tmPitchAndFamily & TMPF_TRUETYPE) != 0)
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    {
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      ABC char_widths;

      if (font_type == UNICODE_FONT)
	retval = GetCharABCWidthsW (hdc, *char2b, *char2b, &char_widths);
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      else
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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;
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	  pcm->ascent = FONT_BASE (font);
	  pcm->descent = FONT_DESCENT (font);
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	}
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    }
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  if (!retval)
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    {
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      /* Either font is not a True-type font, or GetCharABCWidthsW
	 failed (it is not supported on Windows 9x for instance), so we
	 can't determine the full info we would like.  All is not lost
	 though - we can call GetTextExtentPoint32 to get rbearing and
	 deduce width based on the font's per-string overhang.  lbearing
	 is assumed to be zero.  */
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      /* TODO: Some Thai characters (and other composites if Windows
         supports them) do have lbearing, and report their total width
         as zero. Need some way of handling them when
         GetCharABCWidthsW fails. */
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      SIZE sz;

      if (font_type == UNICODE_FONT)
	retval = GetTextExtentPoint32W (hdc, char2b, 1, &sz);
      else
	retval = GetTextExtentPoint32A (hdc, (char*)char2b, 1, &sz);
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      if (retval)
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	{
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	  pcm->width = sz.cx - font->tm.tmOverhang;
	  pcm->rbearing = sz.cx;
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	  pcm->lbearing = 0;
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	  pcm->ascent = FONT_BASE (font);
	  pcm->descent = FONT_DESCENT (font);
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	}
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    }


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  if (pcm->width == 0 && (pcm->rbearing - pcm->lbearing) == 0)
    {
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      retval = FALSE;
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    }

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