w32term.c 216 KB
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/* Implementation of GUI terminal on the Microsoft Windows API.
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Copyright (C) 1989, 1993-2019 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
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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.  If not, see <https://www.gnu.org/licenses/>.  */
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#include <config.h>
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#include <signal.h>
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#include <stdio.h>
#include "lisp.h"
#include "blockinput.h"
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#include "w32term.h"
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#include "w32common.h"	/* for OS version info */
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#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
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#ifdef CYGWIN
#include <fcntl.h>	/* for O_RDWR */
#endif
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#include <imm.h>
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#include <math.h>
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#include "coding.h"
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#include "frame.h"
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#include "fontset.h"
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#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#include "buffer.h"
#include "window.h"
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#include "keyboard.h"
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#include "menu.h"	/* for w32_menu_show */
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#ifdef WINDOWSNT
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#include "w32.h"	/* for filename_from_utf16, filename_from_ansi */
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#endif

#ifndef WINDOWSNT
#include <io.h> /* for get_osfhandle */
#endif

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#include <shellapi.h>
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#include "font.h"
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#include "w32font.h"
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#if 0	/* TODO: stipple */
#include "bitmaps/gray.xbm"
#endif
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/* Fringe bitmaps.  */
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static int max_fringe_bmp = 0;
static HBITMAP *fringe_bmp = 0;
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/* Temporary variables for w32_read_socket.  */
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static int last_mousemove_x = 0;
static int last_mousemove_y = 0;
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/* Define GET_WHEEL_DELTA_WPARAM macro if system headers don't.  */
#ifndef GET_WHEEL_DELTA_WPARAM
#define GET_WHEEL_DELTA_WPARAM(wparam) ((short)HIWORD (wparam))
#endif

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

static int any_help_event_p;

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extern unsigned int msh_mousewheel;

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extern int w32_codepage_for_font (char *fontname);
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extern Cursor w32_load_cursor (LPCTSTR name);
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90

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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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#if _WIN32_WINNT < 0x0500 && !defined(MINGW_W64)
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/* Pre Windows 2000, this was not available, but define it here so
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   that Emacs compiled on such a platform will run on newer versions.
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   MinGW64 defines these unconditionally, so avoid redefining.  */
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typedef struct tagWCRANGE
{
  WCHAR wcLow;
  USHORT cGlyphs;
} WCRANGE;

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typedef struct tagGLYPHSET
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{
  DWORD cbThis;
  DWORD flAccel;
  DWORD cGlyphsSupported;
  DWORD cRanges;
  WCRANGE ranges[1];
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} GLYPHSET;
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#endif /* compiling for pre-Win2k */
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/* Dynamic linking to SetLayeredWindowAttribute (only since 2000).  */
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BOOL (WINAPI *pfnSetLayeredWindowAttributes) (HWND, COLORREF, BYTE, DWORD);
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#ifndef LWA_ALPHA
#define LWA_ALPHA 0x02
#endif
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/* WS_EX_LAYERED is defined unconditionally by MingW, but only for W2K and
   later targets by MSVC headers.  */
#ifndef WS_EX_LAYERED
#define WS_EX_LAYERED 0x80000
#endif
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/* SM_CXVIRTUALSCREEN and SM_CYVIRTUALSCREEN are not defined on 95 and
   NT4.  */
#ifndef SM_CXVIRTUALSCREEN
#define SM_CXVIRTUALSCREEN 78
#endif
#ifndef SM_CYVIRTUALSCREEN
#define SM_CYVIRTUALSCREEN 79
#endif

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/* The handle of the frame that currently owns the system caret.  */
HWND w32_system_caret_hwnd;
int w32_system_caret_height;
int w32_system_caret_x;
int w32_system_caret_y;
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struct window *w32_system_caret_window;
int w32_system_caret_hdr_height;
int w32_system_caret_mode_height;
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DWORD dwWindowsThreadId = 0;
HANDLE hWindowsThread = NULL;
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DWORD dwMainThreadId = 0;
HANDLE hMainThread = NULL;

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int vertical_scroll_bar_min_handle;
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int horizontal_scroll_bar_min_handle;
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int vertical_scroll_bar_top_border;
int vertical_scroll_bar_bottom_border;
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int horizontal_scroll_bar_left_border;
int horizontal_scroll_bar_right_border;
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int last_scroll_bar_drag_pos;

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/* Keyboard code page - may be changed by language-change events.  */
int w32_keyboard_codepage;

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#ifdef CYGWIN
int w32_message_fd = -1;
#endif /* CYGWIN */

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static void w32_handle_tool_bar_click (struct frame *,
                                       struct input_event *);
static void w32_define_cursor (Window, Cursor);

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static void w32_scroll_bar_clear (struct frame *);
static void w32_raise_frame (struct frame *);
static void w32_lower_frame (struct frame *);
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static void w32_initialize (void);
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static void w32_update_end (struct frame *);
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static void w32_frame_up_to_date (struct frame *);
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static void w32_clear_frame (struct frame *);
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static void w32_frame_highlight (struct frame *);
static void w32_frame_unhighlight (struct frame *);
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static void w32_new_focus_frame (struct w32_display_info *,
                                 struct frame *);
static void w32_focus_changed (int, int, struct w32_display_info *,
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                             struct frame *, struct input_event *);
static void w32_detect_focus_change (struct w32_display_info *,
                                     W32Msg *, struct input_event *);
static void w32_frame_rehighlight (struct frame *);
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static void w32_frame_rehighlight_1 (struct w32_display_info *);
static void w32_draw_hollow_cursor (struct window *, struct glyph_row *);
static void w32_draw_bar_cursor (struct window *, struct glyph_row *, int,
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                               enum text_cursor_kinds);
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static void w32_clip_to_row (struct window *, struct glyph_row *,
			     enum glyph_row_area, HDC);
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static BOOL my_show_window (struct frame *, HWND, int);
static void my_set_window_pos (HWND, HWND, int, int, int, int, UINT);
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#if 0
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static void my_set_focus (struct frame *, HWND);
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#endif
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static void my_set_foreground_window (HWND);
static void my_destroy_window (struct frame *, HWND);
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static void w32fullscreen_hook (struct frame *);
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#ifdef GLYPH_DEBUG
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static void w32_check_font (struct frame *, struct font *);
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#endif

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206

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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
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{
  char *locus;
  int type;
};

struct record event_record[100];

int event_record_index;

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

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XGCValues *
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XCreateGC (void *ignore, HWND wignore, unsigned long mask, XGCValues *xgcv)
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{
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  XGCValues *gc = xzalloc (sizeof (XGCValues));
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  XChangeGC (ignore, gc, mask, xgcv);

  return gc;
}

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#if 0	/* unused for now, see w32_draw_image_glyph_string below */
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static void
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XGetGCValues (void *ignore, XGCValues *gc,
	      unsigned long mask, XGCValues *xgcv)
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{
  XChangeGC (ignore, xgcv, mask, gc);
}
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#endif
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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);
}

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/* Restore clipping rectangle in S */
static void
w32_restore_glyph_string_clip (struct glyph_string *s)
{
  RECT *r = s->clip;
  int n = s->num_clips;

  if (n == 1)
    w32_set_clip_rectangle (s->hdc, r);
  else if (n > 1)
    {
      HRGN clip1 = CreateRectRgnIndirect (r);
      HRGN clip2 = CreateRectRgnIndirect (r + 1);
      if (CombineRgn (clip1, clip1, clip2, RGN_OR) != ERROR)
        SelectClipRgn (s->hdc, clip1);
      DeleteObject (clip1);
      DeleteObject (clip2);
    }
}

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static void
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w32_get_scale_factor(struct w32_display_info *dpyinfo, int *scale_x, int *scale_y)
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{
  const int base_res = 96;

  *scale_x = *scale_y = 1;

  if (dpyinfo)
    {
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      if (dpyinfo->resx > base_res)
	*scale_x = floor (dpyinfo->resx / base_res);
      if (dpyinfo->resy > base_res)
	*scale_y = floor (dpyinfo->resy / base_res);
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    }
}

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/*
   Draw a wavy line under S. The wave fills wave_height pixels from y0.

                    x0         wave_length = 2
                                 --
                y0   *   *   *   *   *
                     |* * * * * * * * *
    wave_height = 3  | *   *   *   *

*/

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static void
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w32_draw_underwave (struct glyph_string *s, COLORREF color)
{
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  struct w32_display_info *dpyinfo = FRAME_DISPLAY_INFO (s->f);

  int scale_x, scale_y;
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  w32_get_scale_factor (dpyinfo, &scale_x, &scale_y);
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  int wave_height = 3 * scale_y, wave_length = 2 * scale_x, thickness = scale_y;
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  int dx, dy, x0, y0, width, x1, y1, x2, y2, odd, xmax;
  XRectangle wave_clip, string_clip, final_clip;
  RECT w32_final_clip, w32_string_clip;
  HPEN hp, oldhp;

  dx = wave_length;
  dy = wave_height - 1;
  x0 = s->x;
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  y0 = s->ybase + wave_height / 2 - scale_y;
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  width = s->width;
  xmax = x0 + width;

  /* Find and set clipping rectangle */

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  wave_clip.x = x0;
  wave_clip.y = y0;
  wave_clip.width = width;
  wave_clip.height = wave_height;

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  get_glyph_string_clip_rect (s, &w32_string_clip);
  CONVERT_TO_XRECT (string_clip, w32_string_clip);

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  if (!gui_intersect_rectangles (&wave_clip, &string_clip, &final_clip))
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    return;

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  hp = CreatePen (PS_SOLID, thickness, color);
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  oldhp = SelectObject (s->hdc, hp);
  CONVERT_FROM_XRECT (final_clip, w32_final_clip);
  w32_set_clip_rectangle (s->hdc, &w32_final_clip);

  /* Draw the waves */

  x1 = x0 - (x0 % dx);
  x2 = x1 + dx;
  odd = (x1/dx) % 2;
  y1 = y2 = y0;

  if (odd)
    y1 += dy;
  else
    y2 += dy;

  MoveToEx (s->hdc, x1, y1, NULL);

  while (x1 <= xmax)
    {
      LineTo (s->hdc, x2, y2);
      x1  = x2, y1 = y2;
      x2 += dx, y2 = y0 + odd*dy;
      odd = !odd;
    }

  /* Restore previous pen and clipping rectangle(s) */
  w32_restore_glyph_string_clip (s);
  SelectObject (s->hdc, oldhp);
  DeleteObject (hp);
}
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/* Draw a hollow rectangle at the specified position.  */
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static void
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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);

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  /* We enlarge WIDTH and HEIGHT by 1 to be bug-compatible to the
     brain-dead design of XDrawRectangle, which draws a rectangle that
     is 1 pixel wider and higher than its arguments WIDTH and HEIGHT.
     This allows us to keep the code that calls this function similar
     to the corresponding code in xterm.c.  For the details, see
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     https://lists.gnu.org/r/emacs-devel/2014-10/msg00546.html.  */
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  Rectangle (hdc, x, y, x + width + 1, y + height + 1);
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  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 (struct frame *f, HDC hdc, COLORREF pix, RECT *lprect)
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{
  HBRUSH hb;
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  hb = CreateSolidBrush (pix);
  FillRect (hdc, lprect, hb);
  DeleteObject (hb);
}

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void
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w32_clear_window (struct frame *f)
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{
  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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#define OPAQUE_FRAME 255

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static void
w32_set_frame_alpha (struct frame *f)
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{
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  struct w32_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
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  double alpha = 1.0;
  double alpha_min = 1.0;
  BYTE opac;
  LONG ex_style;
  HWND window = FRAME_W32_WINDOW (f);

  /* Older versions of Windows do not support transparency.  */
  if (!pfnSetLayeredWindowAttributes)
    return;

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  if (dpyinfo->w32_focus_frame == f)
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    alpha = f->alpha[0];
  else
    alpha = f->alpha[1];

  if (FLOATP (Vframe_alpha_lower_limit))
    alpha_min = XFLOAT_DATA (Vframe_alpha_lower_limit);
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  else if (FIXNUMP (Vframe_alpha_lower_limit))
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    alpha_min = (XFIXNUM (Vframe_alpha_lower_limit)) / 100.0;
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  if (alpha < 0.0)
    return;
  else if (alpha > 1.0)
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    alpha = 1.0;
  else if (alpha < alpha_min && alpha_min <= 1.0)
    alpha = alpha_min;

  opac = alpha * OPAQUE_FRAME;

  ex_style = GetWindowLong (window, GWL_EXSTYLE);

  if (opac == OPAQUE_FRAME)
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    ex_style &= ~WS_EX_LAYERED;
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  else
    ex_style |= WS_EX_LAYERED;

  SetWindowLong (window, GWL_EXSTYLE, ex_style);

  if (opac != OPAQUE_FRAME)
    pfnSetLayeredWindowAttributes (window, 0, opac, LWA_ALPHA);
}

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int
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w32_display_pixel_height (struct w32_display_info *dpyinfo)
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{
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  int pixels = GetSystemMetrics (SM_CYVIRTUALSCREEN);

  if (pixels == 0)
    /* Fallback for Windows 95 or NT 4.0.  */
    pixels = GetSystemMetrics (SM_CYSCREEN);

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  return pixels;
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}

int
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w32_display_pixel_width (struct w32_display_info *dpyinfo)
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{
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  int pixels = GetSystemMetrics (SM_CXVIRTUALSCREEN);

  if (pixels == 0)
    /* Fallback for Windows 95 or NT 4.0.  */
    pixels = GetSystemMetrics (SM_CXSCREEN);

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  return pixels;
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}

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525

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/***********************************************************************
		    Starting and ending an update
 ***********************************************************************/
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/* 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.
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   This function is called prior to calls to w32_update_window_begin
   for each window being updated.  */
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static void
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w32_update_begin (struct frame *f)
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{
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  struct w32_display_info *display_info = FRAME_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.  */
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static void
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w32_update_window_begin (struct window *w)
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{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
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  Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
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  /* Hide the system caret during an update.  */
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  if (w32_use_visible_system_caret && w32_system_caret_hwnd)
    {
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      SendMessageTimeout (w32_system_caret_hwnd, WM_EMACS_HIDE_CARET, 0, 0,
			  0, 6000, NULL);
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    }
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  w->output_cursor = w->cursor;
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  block_input ();
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  if (f == hlinfo->mouse_face_mouse_frame)
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    {
      /* Don't do highlighting for mouse motion during the update.  */
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      hlinfo->mouse_face_defer = true;
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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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	hlinfo->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.  */
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      if (!NILP (hlinfo->mouse_face_window)
	  && w == XWINDOW (hlinfo->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)
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	    clear_mouse_face (hlinfo);
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	}
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#endif /* 0 */
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    }

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  unblock_input ();
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}

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/* Draw a vertical window border from (x,y0) to (x,y1)  */
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static void
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w32_draw_vertical_window_border (struct window *w, int x, int y0, int y1)
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{
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  struct frame *f = XFRAME (WINDOW_FRAME (w));
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  RECT r;
  HDC hdc;
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  struct face *face;
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  r.left = x;
  r.right = x + 1;
  r.top = y0;
  r.bottom = y1;
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  hdc = get_frame_dc (f);
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  face = FACE_FROM_ID_OR_NULL (f, VERTICAL_BORDER_FACE_ID);
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  if (face)
    w32_fill_rect (f, hdc, face->foreground, &r);
  else
    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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/* Draw a window divider from (x0, y0) to (x1, y1)  */

static void
w32_draw_window_divider (struct window *w, int x0, int x1, int y0, int y1)
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
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  HDC hdc = get_frame_dc (f);
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  struct face *face = FACE_FROM_ID_OR_NULL (f, WINDOW_DIVIDER_FACE_ID);
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  struct face *face_first
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    = FACE_FROM_ID_OR_NULL (f, WINDOW_DIVIDER_FIRST_PIXEL_FACE_ID);
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  struct face *face_last
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    = FACE_FROM_ID_OR_NULL (f, WINDOW_DIVIDER_LAST_PIXEL_FACE_ID);
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  unsigned long color = face ? face->foreground : FRAME_FOREGROUND_PIXEL (f);
  unsigned long color_first = (face_first
			       ? face_first->foreground
			       : FRAME_FOREGROUND_PIXEL (f));
  unsigned long color_last = (face_last
			      ? face_last->foreground
			      : FRAME_FOREGROUND_PIXEL (f));

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  if ((y1 - y0 > x1 - x0) && (x1 - x0 >= 3))
    /* A vertical divider, at least three pixels wide: Draw first and
       last pixels differently.  */
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    {
      w32_fill_area_abs (f, hdc, color_first, x0, y0, x0 + 1, y1);
      w32_fill_area_abs (f, hdc, color, x0 + 1, y0, x1 - 1, y1);
      w32_fill_area_abs (f, hdc, color_last, x1 - 1, y0, x1, y1);
    }
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  else if ((x1 - x0 > y1 - y0) && (y1 - y0 >= 3))
    /* A horizontal divider, at least three pixels high: Draw first and
       last pixels differently.  */
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    {
      w32_fill_area_abs (f, hdc, color_first, x0, y0, x1, y0 + 1);
      w32_fill_area_abs (f, hdc, color, x0, y0 + 1, x1, y1 - 1);
      w32_fill_area_abs (f, hdc, color_last, x0, y1 - 1, x1, y1);
    }
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  else
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    /* In any other case do not draw the first and last pixels
       differently.  */
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    w32_fill_area_abs (f, hdc, color, x0, y0, x1, y1);
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  release_frame_dc (f, hdc);
}

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/* End update of window W.
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   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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w32_update_window_end (struct window *w, bool cursor_on_p,
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		     bool mouse_face_overwritten_p)
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{
  if (!w->pseudo_window_p)
    {
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      block_input ();
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      if (cursor_on_p)
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	display_and_set_cursor (w, true,
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				w->output_cursor.hpos, w->output_cursor.vpos,
				w->output_cursor.x, w->output_cursor.y);
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      if (draw_window_fringes (w, true))
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	{
	  if (WINDOW_RIGHT_DIVIDER_WIDTH (w))
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	    gui_draw_right_divider (w);
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	  else
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	    gui_draw_vertical_border (w);
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	}
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      unblock_input ();
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    }
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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)
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    {
      Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (XFRAME (w->frame));

      hlinfo->mouse_face_beg_row = hlinfo->mouse_face_beg_col = -1;
      hlinfo->mouse_face_end_row = hlinfo->mouse_face_end_col = -1;
      hlinfo->mouse_face_window = Qnil;
    }
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  /* Unhide the caret.  This won't actually show the cursor, unless it
     was visible before the corresponding call to HideCaret in
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     w32_update_window_begin.  */
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  if (w32_use_visible_system_caret && w32_system_caret_hwnd)
    {
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      SendMessageTimeout (w32_system_caret_hwnd, WM_EMACS_SHOW_CARET, 0, 0,
			  0, 6000, NULL);
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    }
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}

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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
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w32_update_end (struct frame *f)
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{
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  if (! FRAME_W32_P (f))
    return;

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  /* Mouse highlight may be displayed again.  */
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  MOUSE_HL_INFO (f)->mouse_face_defer = false;
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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.  */
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static void
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w32_frame_up_to_date (struct frame *f)
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{
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  if (FRAME_W32_P (f))
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    FRAME_MOUSE_UPDATE (f);
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}
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/* Draw truncation mark bitmaps, continuation mark bitmaps, overlay
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   arrow bitmaps, or clear the fringes if no bitmaps are required
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   before DESIRED_ROW is made current.  This function is called from
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   update_window_line only if it is known that there are differences
   between bitmaps to be drawn between current row and DESIRED_ROW.  */

static void
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w32_after_update_window_line (struct window *w, struct glyph_row *desired_row)
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{
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  struct frame *f;
  int width, height;

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  eassert (w);
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  if (!desired_row->mode_line_p && !w->pseudo_window_p)
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    desired_row->redraw_fringe_bitmaps_p = true;
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  /* When a window has disappeared, make sure that no rest of
     full-width rows stays visible in the internal border.  Could
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     check here if updated window is the leftmost/rightmost window,
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     but I guess it's not worth doing since vertically split windows
     are almost never used, internal border is rarely set, and the
     overhead is very small.  */
  if (windows_or_buffers_changed
      && desired_row->full_width_p
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      && (f = XFRAME (w->frame),
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	  width = FRAME_INTERNAL_BORDER_WIDTH (f),
	  width != 0)
      && (height = desired_row->visible_height,
	  height > 0))
    {
      int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));
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      int face_id =
	!NILP (Vface_remapping_alist)
	? lookup_basic_face (NULL, f, INTERNAL_BORDER_FACE_ID)
	: INTERNAL_BORDER_FACE_ID;
      struct face *face = FACE_FROM_ID_OR_NULL (f, face_id);
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      block_input ();
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      HDC hdc = get_frame_dc (f);
      if (face)
	{
	  /* Fill border with internal border face.  */
	  unsigned long color = face->background;

	  w32_fill_area (f, hdc, color, 0, y, width, height);
	  w32_fill_area (f, hdc, color, FRAME_PIXEL_WIDTH (f) - width,
			 y, width, height);
	}
      else
	{
	  w32_clear_area (f, hdc, 0, y, width, height);
	  w32_clear_area (f, hdc, FRAME_PIXEL_WIDTH (f) - width,
			  y, width, height);
	}
      release_frame_dc (f, hdc);

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      unblock_input ();
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    }
}


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

static void
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w32_draw_fringe_bitmap (struct window *w, struct glyph_row *row,
			struct draw_fringe_bitmap_params *p)
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{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
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  HDC hdc;
  struct face *face = p->face;

  hdc = get_frame_dc (f);
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  /* Must clip because of partially visible lines.  */
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  w32_clip_to_row (w, row, ANY_AREA, hdc);
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  if (p->bx >= 0 && !p->overlay_p)
    w32_fill_area (f, hdc, face->background,
		   p->bx, p->by, p->nx, p->ny);

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  if (p->which && p->which < max_fringe_bmp)
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    {
      HBITMAP pixmap = fringe_bmp[p->which];
      HDC compat_hdc;
      HANDLE horig_obj;
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      compat_hdc = CreateCompatibleDC (hdc);
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      SaveDC (hdc);
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      horig_obj = SelectObject (compat_hdc, pixmap);
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      /* Paint overlays transparently.  */
      if (p->overlay_p)
	{
	  HBRUSH h_brush, h_orig_brush;

	  SetTextColor (hdc, BLACK_PIX_DEFAULT (f));
	  SetBkColor (hdc, WHITE_PIX_DEFAULT (f));
	  h_brush = CreateSolidBrush (face->foreground);
	  h_orig_brush = SelectObject (hdc, h_brush);

	  BitBlt (hdc, p->x, p->y, p->wd, p->h,
		  compat_hdc, 0, p->dh,
		  DSTINVERT);
	  BitBlt (hdc, p->x, p->y, p->wd, p->h,
		  compat_hdc, 0, p->dh,
		  0x2E064A);
	  BitBlt (hdc, p->x, p->y, p->wd, p->h,
		  compat_hdc, 0, p->dh,
		  DSTINVERT);

	  SelectObject (hdc, h_orig_brush);
	  DeleteObject (h_brush);
	}
      else
	{
	  SetTextColor (hdc, face->background);
	  SetBkColor (hdc, (p->cursor_p
			    ? f->output_data.w32->cursor_pixel
			    : face->foreground));

	  BitBlt (hdc, p->x, p->y, p->wd, p->h,
		  compat_hdc, 0, p->dh,
		  SRCCOPY);
	}
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      SelectObject (compat_hdc, horig_obj);
      DeleteDC (compat_hdc);
      RestoreDC (hdc, -1);
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    }
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  w32_set_clip_rectangle (hdc, NULL);
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  release_frame_dc (f, hdc);
}

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static void
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w32_define_fringe_bitmap (int which, unsigned short *bits, int h, int wd)
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{
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  if (which >= max_fringe_bmp)
    {
      int i = max_fringe_bmp;
      max_fringe_bmp = which + 20;
      fringe_bmp = (HBITMAP *) xrealloc (fringe_bmp, max_fringe_bmp * sizeof (HBITMAP));
      while (i < max_fringe_bmp)
	fringe_bmp[i++] = 0;
    }

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  fringe_bmp[which] = CreateBitmap (wd, h, 1, 1, bits);
}

static void
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w32_destroy_fringe_bitmap (int which)
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{
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  if (which >= max_fringe_bmp)
    return;

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  if (fringe_bmp[which])
    DeleteObject (fringe_bmp[which]);
  fringe_bmp[which] = 0;
}

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/***********************************************************************
			   Display Iterator
 ***********************************************************************/

/* Function prototypes of this page.  */

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static void w32_set_glyph_string_clipping (struct glyph_string *);
static void w32_set_glyph_string_gc (struct glyph_string *);
static void w32_draw_glyph_string_background (struct glyph_string *,
                                              bool);
static void w32_draw_glyph_string_foreground (struct glyph_string *);
static void w32_draw_composite_glyph_string_foreground (struct glyph_string *);
static void w32_draw_glyph_string_box (struct glyph_string *);
static void w32_draw_glyph_string  (struct glyph_string *);
static void w32_set_cursor_gc (struct glyph_string *);
static void w32_set_mode_line_face_gc (struct glyph_string *);
static void w32_set_mouse_face_gc (struct glyph_string *);
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static int w32_alloc_lighter_color (struct frame *, COLORREF *, double, int);
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static void w32_setup_relief_color (struct frame *, struct relief *,
                                    double, int, COLORREF);
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static void w32_setup_relief_colors (struct glyph_string *);
static void w32_draw_image_glyph_string (struct glyph_string *);
static void w32_draw_image_relief (struct glyph_string *);
static void w32_draw_image_foreground (struct glyph_string *);
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static void w32_draw_image_foreground_1 (struct glyph_string *, HBITMAP);
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static void w32_clear_glyph_string_rect (struct glyph_string *, int,
                                         int, int, int);
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static void w32_draw_relief_rect (struct frame *, int, int, int, int,
                                  int, int, int, int, int, int,
                                  RECT *);
static void w32_draw_box_rect (struct glyph_string *, int, int, int, int,
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                               int, bool, bool, RECT *);
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/* Set S->gc to a suitable GC for drawing glyph string S in cursor
   face.  */

static void
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w32_set_cursor_gc (struct glyph_string *s)
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{
  if (s->font == FRAME_FONT (s->f)
      && s->face->background == FRAME_BACKGROUND_PIXEL (s->f)
      && s->face->foreground == FRAME_FOREGROUND_PIXEL (s->f)
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      /* Sometimes we are not called for each change in the default
	 face's background color (e.g., bug#26851), so the additional
	 test in the next line gives us a chance to resync.  */
      && s->f->output_data.w32->cursor_gc->foreground == s->face->background
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      && !s->cmp)
    s->gc = s->f->output_data.w32->cursor_gc;
  else
    {
      /* Cursor on non-default face: must merge.  */
      XGCValues xgcv;
      unsigned long mask;

      xgcv.background = s->f->output_data.w32->cursor_pixel;
      xgcv.foreground = s->face->background;

      /* If the glyph would be invisible, try a different foreground.  */
      if (xgcv.foreground == xgcv.background)
	xgcv.foreground = s->face->foreground;
      if (xgcv.foreground == xgcv.background)
	xgcv.foreground = s->f->output_data.w32->cursor_foreground_pixel;
      if (xgcv.foreground == xgcv.background)
	xgcv.foreground = s->face->foreground;

      /* Make sure the cursor is distinct from text in this face.  */
      if (xgcv.background == s->face->background
	  && xgcv.foreground == s->face->foreground)
	{
	  xgcv.background = s->face->foreground;
	  xgcv.foreground = s->face->background;
	}

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      IF_DEBUG (w32_check_font (s->f, s->font));
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      xgcv.font = s->font;
      mask = GCForeground | GCBackground | GCFont;

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      if (FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc)
	XChangeGC (NULL, FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc,
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		   mask, &xgcv);
      else
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	FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc
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	  = XCreateGC (NULL, FRAME_W32_WINDOW (s->f), mask, &xgcv);
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      s->gc = FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc;
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    }
}


/* Set up S->gc of glyph string S for drawing text in mouse face.  */
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static void
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w32_set_mouse_face_gc (struct glyph_string *s)
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{
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  int face_id;
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  struct face *face;
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  /* What face has to be used last for the mouse face?  */
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  face_id = MOUSE_HL_INFO (s->f)->mouse_face_face_id;
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  face = FACE_FROM_ID_OR_NULL (s->f, face_id);
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  if (face == NULL)
    face = FACE_FROM_ID (s->f, MOUSE_FACE_ID);
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  if (s->first_glyph->type == CHAR_GLYPH)
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    face_id = FACE_FOR_CHAR (s->f, face, s->first_glyph->u.ch, -1, Qnil);
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  else
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    face_id = FACE_FOR_CHAR (s->f, face, 0, -1, Qnil);
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  s->face = FACE_FROM_ID (s->f, face_id);
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  prepare_face_for_display (s->f, s->face);
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  /* If font in this face is same as S->font, use it.  */
  if (s->font == s->face->font)
    s->gc = s->face->gc;
  else
    {
      /* Otherwise construct scratch_cursor_gc with values from FACE
	 but font FONT.  */
      XGCValues xgcv;
      unsigned long mask;
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      xgcv.background = s->face->background;
      xgcv.foreground = s->face->foreground;
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      IF_DEBUG (w32_check_font (s->f, s->font));
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      xgcv.font = s->font;
      mask = GCForeground | GCBackground | GCFont;
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      if (FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc)
	XChangeGC (NULL, FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc,
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		   mask, &xgcv);
      else
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	FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc
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	  = XCreateGC (NULL, FRAME_W32_WINDOW (s->f), mask, &xgcv);
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      s->gc = FRAME_DISPLAY_INFO (s->f)->scratch_cursor_gc;
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    }

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  eassert (s->gc != 0);
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}


/* Set S->gc of glyph string S to a GC suitable for drawing a mode line.
   Faces to use in the mode line have already been computed when the
   matrix was built, so there isn't much to do, here.  */

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static inline void
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w32_set_mode_line_face_gc (struct glyph_string *s)
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{
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  s->gc = s->face->gc;
}


/* Set S->gc of glyph string S for drawing that glyph string.  Set
   S->stippled_p to a non-zero value if the face of S has a stipple
   pattern.  */

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static inline void
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w32_set_glyph_string_gc (struct glyph_string *s)
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{
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  prepare_face_for_display (s->f, s->face);
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