xterm.c 390 KB
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/* X Communication module for terminals which understand the X protocol.
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Copyright (C) 1989, 1993-2017 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 <http://www.gnu.org/licenses/>.  */
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/* New display code by Gerd Moellmann <gerd@gnu.org>.  */
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/* Xt features made by Fred Pierresteguy.  */

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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "lisp.h"
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#include "blockinput.h"
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/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"
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#include <X11/cursorfont.h>
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/* If we have Xfixes extension, use it for pointer blanking.  */
#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif

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/* Using Xft implies that XRender is available.  */
#ifdef HAVE_XFT
#include <X11/extensions/Xrender.h>
#endif

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#ifdef HAVE_XDBE
#include <X11/extensions/Xdbe.h>
#endif

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/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
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#endif /* makedev */
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#include <sys/ioctl.h>

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#include "systime.h"
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#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
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#include "character.h"
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#include "coding.h"
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#include "composite.h"
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#include "frame.h"
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#include "dispextern.h"
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#include "xwidget.h"
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#include "fontset.h"
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#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
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#include "emacs-icon.h"
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#include "buffer.h"
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#include "window.h"
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#include "keyboard.h"
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#include "atimer.h"
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#include "font.h"
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#include "xsettings.h"
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#include "sysselect.h"
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#include "menu.h"
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#ifdef USE_X_TOOLKIT
#include <X11/Shell.h>
#endif

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#include <unistd.h>

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#ifdef USE_GTK
#include "gtkutil.h"
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#ifdef HAVE_GTK3
#include <X11/Xproto.h>
#endif
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#endif

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#if defined (USE_LUCID) || defined (USE_MOTIF)
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#include "../lwlib/xlwmenu.h"
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#endif
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#ifdef USE_X_TOOLKIT
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/* Include toolkit specific headers for the scroll bar widget.  */

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

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

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#endif /* USE_X_TOOLKIT */

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

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#include "bitmaps/gray.xbm"

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#ifdef HAVE_XKB
#include <X11/XKBlib.h>
#endif

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/* Default to using XIM if available.  */
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#ifdef USE_XIM
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bool use_xim = true;
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#else
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bool use_xim = false;  /* configure --without-xim */
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#endif

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

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

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struct x_display_info *x_display_list;
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#ifdef USE_X_TOOLKIT
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/* The application context for Xt use.  */
XtAppContext Xt_app_con;
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static String Xt_default_resources[] = {0};
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/* Non-zero means user is interacting with a toolkit scroll bar.  */
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static bool toolkit_scroll_bar_interaction;
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#endif /* USE_X_TOOLKIT */
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/* Non-zero timeout value means ignore next mouse click if it arrives
   before that timeout elapses (i.e. as part of the same sequence of
   events resulting from clicking on a frame to select it).  */

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static Time ignore_next_mouse_click_timeout;
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/* Used locally within XTread_socket.  */
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static int x_noop_count;
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#ifdef USE_GTK
/* The name of the Emacs icon file.  */
static Lisp_Object xg_default_icon_file;
#endif

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/* Some functions take this as char *, not const char *.  */
static char emacs_class[] = EMACS_CLASS;

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enum xembed_info
  {
    XEMBED_MAPPED = 1 << 0
  };

enum xembed_message
  {
    XEMBED_EMBEDDED_NOTIFY        = 0,
    XEMBED_WINDOW_ACTIVATE        = 1,
    XEMBED_WINDOW_DEACTIVATE      = 2,
    XEMBED_REQUEST_FOCUS          = 3,
    XEMBED_FOCUS_IN               = 4,
    XEMBED_FOCUS_OUT              = 5,
    XEMBED_FOCUS_NEXT             = 6,
    XEMBED_FOCUS_PREV             = 7,

    XEMBED_MODALITY_ON            = 10,
    XEMBED_MODALITY_OFF           = 11,
    XEMBED_REGISTER_ACCELERATOR   = 12,
    XEMBED_UNREGISTER_ACCELERATOR = 13,
    XEMBED_ACTIVATE_ACCELERATOR   = 14
  };
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static void x_free_cr_resources (struct frame *);
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static bool x_alloc_nearest_color_1 (Display *, Colormap, XColor *);
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static void x_raise_frame (struct frame *);
static void x_lower_frame (struct frame *);
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static int x_io_error_quitter (Display *);
static struct terminal *x_create_terminal (struct x_display_info *);
static void x_frame_rehighlight (struct x_display_info *);

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static void x_clip_to_row (struct window *, struct glyph_row *,
			   enum glyph_row_area, GC);
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static struct scroll_bar *x_window_to_scroll_bar (Display *, Window, int);
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static void x_scroll_bar_report_motion (struct frame **, Lisp_Object *,
                                        enum scroll_bar_part *,
                                        Lisp_Object *, Lisp_Object *,
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                                        Time *);
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static void x_horizontal_scroll_bar_report_motion (struct frame **, Lisp_Object *,
						   enum scroll_bar_part *,
						   Lisp_Object *, Lisp_Object *,
						   Time *);
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static bool x_handle_net_wm_state (struct frame *, const XPropertyEvent *);
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static void x_check_fullscreen (struct frame *);
static void x_check_expected_move (struct frame *, int, int);
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static void x_sync_with_move (struct frame *, int, int, bool);
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static int handle_one_xevent (struct x_display_info *,
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			      const XEvent *, int *,
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			      struct input_event *);
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#if ! (defined USE_X_TOOLKIT || defined USE_MOTIF)
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static int x_dispatch_event (XEvent *, Display *);
#endif
static void x_wm_set_window_state (struct frame *, int);
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static void x_wm_set_icon_pixmap (struct frame *, ptrdiff_t);
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static void x_initialize (void);
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static bool get_current_wm_state (struct frame *, Window, int *, bool *);
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/* Flush display of frame F.  */
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static void
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x_flush (struct frame *f)
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{
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  eassert (f && FRAME_X_P (f));
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  /* Don't call XFlush when it is not safe to redisplay; the X
     connection may be broken.  */
  if (!NILP (Vinhibit_redisplay))
    return;

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  block_input ();
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  XFlush (FRAME_X_DISPLAY (f));
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  unblock_input ();
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}

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

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#define XFlush(DISPLAY)	(void) 0
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269

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/***********************************************************************
			      Debugging
 ***********************************************************************/

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#if false
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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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void
record_event (char *locus, int type)
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{
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  if (event_record_index == ARRAYELTS (event_record))
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    event_record_index = 0;

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

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#endif
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#ifdef USE_CAIRO

#define FRAME_CR_CONTEXT(f)	((f)->output_data.x->cr_context)
#define FRAME_CR_SURFACE(f)	((f)->output_data.x->cr_surface)

static struct x_gc_ext_data *
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x_gc_get_ext_data (struct frame *f, GC gc, int create_if_not_found_p)
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{
  struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
  XEDataObject object;
  XExtData **head, *ext_data;

  object.gc = gc;
  head = XEHeadOfExtensionList (object);
  ext_data = XFindOnExtensionList (head, dpyinfo->ext_codes->extension);
  if (ext_data == NULL)
    {
      if (!create_if_not_found_p)
	return NULL;
      else
	{
	  ext_data = xzalloc (sizeof (*ext_data));
	  ext_data->number = dpyinfo->ext_codes->extension;
	  ext_data->private_data = xzalloc (sizeof (struct x_gc_ext_data));
	  XAddToExtensionList (head, ext_data);
	}
    }
  return (struct x_gc_ext_data *) ext_data->private_data;
}

static void
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x_extension_initialize (struct x_display_info *dpyinfo)
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{
  XExtCodes *ext_codes = XAddExtension (dpyinfo->display);

  dpyinfo->ext_codes = ext_codes;
}

static void
x_cr_destroy_surface (struct frame *f)
{
  if (FRAME_CR_SURFACE (f))
    {
      cairo_t *cr = FRAME_CR_CONTEXT (f);
      cairo_surface_destroy (FRAME_CR_SURFACE (f));
      FRAME_CR_SURFACE (f) = 0;
      if (cr) cairo_destroy (cr);
      FRAME_CR_CONTEXT (f) = NULL;
    }
}

cairo_t *
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x_begin_cr_clip (struct frame *f, GC gc)
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{
  cairo_t *cr = FRAME_CR_CONTEXT (f);

  if (!cr)
    {

      if (! FRAME_CR_SURFACE (f))
        {
          cairo_surface_t *surface;
          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
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                                               FRAME_X_DRAWABLE (f),
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                                               FRAME_DISPLAY_INFO (f)->visual,
                                               FRAME_PIXEL_WIDTH (f),
                                               FRAME_PIXEL_HEIGHT (f));
          cr = cairo_create (surface);
          cairo_surface_destroy (surface);
        }
      else
        cr = cairo_create (FRAME_CR_SURFACE (f));
      FRAME_CR_CONTEXT (f) = cr;
    }
  cairo_save (cr);

  if (gc)
    {
      struct x_gc_ext_data *gc_ext = x_gc_get_ext_data (f, gc, 0);

      if (gc_ext && gc_ext->n_clip_rects)
	{
	  int i;

	  for (i = 0; i < gc_ext->n_clip_rects; i++)
	    cairo_rectangle (cr, gc_ext->clip_rects[i].x,
			     gc_ext->clip_rects[i].y,
			     gc_ext->clip_rects[i].width,
			     gc_ext->clip_rects[i].height);
	  cairo_clip (cr);
	}
    }

  return cr;
}

void
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x_end_cr_clip (struct frame *f)
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{
  cairo_restore (FRAME_CR_CONTEXT (f));
}

void
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x_set_cr_source_with_gc_foreground (struct frame *f, GC gc)
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{
  XGCValues xgcv;
  XColor color;

  XGetGCValues (FRAME_X_DISPLAY (f), gc, GCForeground, &xgcv);
  color.pixel = xgcv.foreground;
  x_query_color (f, &color);
  cairo_set_source_rgb (FRAME_CR_CONTEXT (f), color.red / 65535.0,
			color.green / 65535.0, color.blue / 65535.0);
}

void
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x_set_cr_source_with_gc_background (struct frame *f, GC gc)
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{
  XGCValues xgcv;
  XColor color;

  XGetGCValues (FRAME_X_DISPLAY (f), gc, GCBackground, &xgcv);
  color.pixel = xgcv.background;
  x_query_color (f, &color);
  cairo_set_source_rgb (FRAME_CR_CONTEXT (f), color.red / 65535.0,
			color.green / 65535.0, color.blue / 65535.0);
}

/* Fringe bitmaps.  */

static int max_fringe_bmp = 0;
static cairo_pattern_t **fringe_bmp = 0;

static void
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x_cr_define_fringe_bitmap (int which, unsigned short *bits, int h, int wd)
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{
  int i, stride;
  cairo_surface_t *surface;
  unsigned char *data;
  cairo_pattern_t *pattern;

  if (which >= max_fringe_bmp)
    {
      i = max_fringe_bmp;
      max_fringe_bmp = which + 20;
      fringe_bmp = (cairo_pattern_t **) xrealloc (fringe_bmp, max_fringe_bmp * sizeof (cairo_pattern_t *));
      while (i < max_fringe_bmp)
	fringe_bmp[i++] = 0;
    }

  block_input ();

  surface = cairo_image_surface_create (CAIRO_FORMAT_A1, wd, h);
  stride = cairo_image_surface_get_stride (surface);
  data = cairo_image_surface_get_data (surface);

  for (i = 0; i < h; i++)
    {
      *((unsigned short *) data) = bits[i];
      data += stride;
    }

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  cairo_surface_mark_dirty (surface);
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  pattern = cairo_pattern_create_for_surface (surface);
  cairo_surface_destroy (surface);

  unblock_input ();

  fringe_bmp[which] = pattern;
}

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

  if (fringe_bmp[which])
    {
      block_input ();
      cairo_pattern_destroy (fringe_bmp[which]);
      unblock_input ();
    }
  fringe_bmp[which] = 0;
}

static void
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x_cr_draw_image (struct frame *f, GC gc, cairo_pattern_t *image,
		 int src_x, int src_y, int width, int height,
		 int dest_x, int dest_y, bool overlay_p)
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{
  cairo_t *cr;
  cairo_matrix_t matrix;
  cairo_surface_t *surface;
  cairo_format_t format;

  cr = x_begin_cr_clip (f, gc);
  if (overlay_p)
    cairo_rectangle (cr, dest_x, dest_y, width, height);
  else
    {
      x_set_cr_source_with_gc_background (f, gc);
      cairo_rectangle (cr, dest_x, dest_y, width, height);
      cairo_fill_preserve (cr);
    }
  cairo_clip (cr);
  cairo_matrix_init_translate (&matrix, src_x - dest_x, src_y - dest_y);
  cairo_pattern_set_matrix (image, &matrix);
  cairo_pattern_get_surface (image, &surface);
  format = cairo_image_surface_get_format (surface);
  if (format != CAIRO_FORMAT_A8 && format != CAIRO_FORMAT_A1)
    {
      cairo_set_source (cr, image);
      cairo_fill (cr);
    }
  else
    {
      x_set_cr_source_with_gc_foreground (f, gc);
      cairo_mask (cr, image);
    }
  x_end_cr_clip (f);
}

void
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x_cr_draw_frame (cairo_t *cr, struct frame *f)
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{
  int width, height;

  width = FRAME_PIXEL_WIDTH (f);
  height = FRAME_PIXEL_HEIGHT (f);

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  x_free_cr_resources (f);
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  FRAME_CR_CONTEXT (f) = cr;
  x_clear_area (f, 0, 0, width, height);
  expose_frame (f, 0, 0, width, height);
  FRAME_CR_CONTEXT (f) = NULL;
}

static cairo_status_t
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x_cr_accumulate_data (void *closure, const unsigned char *data,
		      unsigned int length)
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{
  Lisp_Object *acc = (Lisp_Object *) closure;

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  *acc = Fcons (make_unibyte_string ((char const *) data, length), *acc);
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  return CAIRO_STATUS_SUCCESS;
}

static void
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x_cr_destroy (Lisp_Object arg)
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{
  cairo_t *cr = (cairo_t *) XSAVE_POINTER (arg, 0);

  block_input ();
  cairo_destroy (cr);
  unblock_input ();
}

Lisp_Object
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x_cr_export_frames (Lisp_Object frames, cairo_surface_type_t surface_type)
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{
  struct frame *f;
  cairo_surface_t *surface;
  cairo_t *cr;
  int width, height;
  void (*surface_set_size_func) (cairo_surface_t *, double, double) = NULL;
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  Lisp_Object acc = Qnil;
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  ptrdiff_t count = SPECPDL_INDEX ();
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  specbind (Qredisplay_dont_pause, Qt);
  redisplay_preserve_echo_area (31);
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  f = XFRAME (XCAR (frames));
  frames = XCDR (frames);
  width = FRAME_PIXEL_WIDTH (f);
  height = FRAME_PIXEL_HEIGHT (f);

  block_input ();
#ifdef CAIRO_HAS_PDF_SURFACE
  if (surface_type == CAIRO_SURFACE_TYPE_PDF)
    {
      surface = cairo_pdf_surface_create_for_stream (x_cr_accumulate_data, &acc,
						     width, height);
      surface_set_size_func = cairo_pdf_surface_set_size;
    }
  else
#endif
#ifdef CAIRO_HAS_PNG_FUNCTIONS
  if (surface_type == CAIRO_SURFACE_TYPE_IMAGE)
    surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
  else
#endif
#ifdef CAIRO_HAS_PS_SURFACE
  if (surface_type == CAIRO_SURFACE_TYPE_PS)
    {
      surface = cairo_ps_surface_create_for_stream (x_cr_accumulate_data, &acc,
						    width, height);
      surface_set_size_func = cairo_ps_surface_set_size;
    }
  else
#endif
#ifdef CAIRO_HAS_SVG_SURFACE
  if (surface_type == CAIRO_SURFACE_TYPE_SVG)
    surface = cairo_svg_surface_create_for_stream (x_cr_accumulate_data, &acc,
						   width, height);
  else
#endif
    abort ();

  cr = cairo_create (surface);
  cairo_surface_destroy (surface);
  record_unwind_protect (x_cr_destroy, make_save_ptr (cr));

  while (1)
    {
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      x_free_cr_resources (f);
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      FRAME_CR_CONTEXT (f) = cr;
      x_clear_area (f, 0, 0, width, height);
      expose_frame (f, 0, 0, width, height);
      FRAME_CR_CONTEXT (f) = NULL;

      if (NILP (frames))
	break;

      cairo_surface_show_page (surface);
      f = XFRAME (XCAR (frames));
      frames = XCDR (frames);
      width = FRAME_PIXEL_WIDTH (f);
      height = FRAME_PIXEL_HEIGHT (f);
      if (surface_set_size_func)
	(*surface_set_size_func) (surface, width, height);
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      unblock_input ();
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      maybe_quit ();
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      block_input ();
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    }

#ifdef CAIRO_HAS_PNG_FUNCTIONS
  if (surface_type == CAIRO_SURFACE_TYPE_IMAGE)
    {
      cairo_surface_flush (surface);
      cairo_surface_write_to_png_stream (surface, x_cr_accumulate_data, &acc);
    }
#endif
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  unblock_input ();

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  unbind_to (count, Qnil);

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  return CALLN (Fapply, intern ("concat"), Fnreverse (acc));
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}

#endif	/* USE_CAIRO */

static void
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x_free_cr_resources (struct frame *f)
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{
#ifdef USE_CAIRO
  if (f == NULL)
    {
      Lisp_Object rest, frame;
      FOR_EACH_FRAME (rest, frame)
	if (FRAME_X_P (XFRAME (frame)))
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	  x_free_cr_resources (XFRAME (frame));
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    }
  else
    {
      cairo_t *cr = FRAME_CR_CONTEXT (f);

      if (cr)
	{
	  cairo_surface_t *surface = cairo_get_target (cr);

	  if (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_XLIB)
	    {
	      cairo_destroy (cr);
	      FRAME_CR_CONTEXT (f) = NULL;
	    }
	}
    }
#endif
}

static void
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x_set_clip_rectangles (struct frame *f, GC gc, XRectangle *rectangles, int n)
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{
  XSetClipRectangles (FRAME_X_DISPLAY (f), gc, 0, 0, rectangles, n, Unsorted);
#ifdef USE_CAIRO
  eassert (n >= 0 && n <= MAX_CLIP_RECTS);

  {
    struct x_gc_ext_data *gc_ext = x_gc_get_ext_data (f, gc, 1);

    gc_ext->n_clip_rects = n;
    memcpy (gc_ext->clip_rects, rectangles, sizeof (XRectangle) * n);
  }
#endif
}

static void
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x_reset_clip_rectangles (struct frame *f, GC gc)
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{
  XSetClipMask (FRAME_X_DISPLAY (f), gc, None);
#ifdef USE_CAIRO
  {
    struct x_gc_ext_data *gc_ext = x_gc_get_ext_data (f, gc, 0);

    if (gc_ext)
      gc_ext->n_clip_rects = 0;
  }
#endif
}

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static void
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x_fill_rectangle (struct frame *f, GC gc, int x, int y, int width, int height)
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{
#ifdef USE_CAIRO
  cairo_t *cr;

  cr = x_begin_cr_clip (f, gc);
  x_set_cr_source_with_gc_foreground (f, gc);
  cairo_rectangle (cr, x, y, width, height);
  cairo_fill (cr);
  x_end_cr_clip (f);
#else
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  XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
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		  gc, x, y, width, height);
#endif
}

static void
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x_draw_rectangle (struct frame *f, GC gc, int x, int y, int width, int height)
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{
#ifdef USE_CAIRO
  cairo_t *cr;

  cr = x_begin_cr_clip (f, gc);
  x_set_cr_source_with_gc_foreground (f, gc);
  cairo_rectangle (cr, x + 0.5, y + 0.5, width, height);
  cairo_set_line_width (cr, 1);
  cairo_stroke (cr);
  x_end_cr_clip (f);
#else
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  XDrawRectangle (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
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		  gc, x, y, width, height);
#endif
}

static void
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x_clear_window (struct frame *f)
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{
#ifdef USE_CAIRO
  cairo_t *cr;

  cr = x_begin_cr_clip (f, NULL);
  x_set_cr_source_with_gc_background (f, f->output_data.x->normal_gc);
  cairo_paint (cr);
  x_end_cr_clip (f);
#else
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  if (FRAME_X_DOUBLE_BUFFERED_P (f))
    x_clear_area (f, 0, 0, FRAME_PIXEL_WIDTH (f), FRAME_PIXEL_HEIGHT (f));
  else
    XClearWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
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#endif
}

#ifdef USE_CAIRO
static void
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x_fill_trapezoid_for_relief (struct frame *f, GC gc, int x, int y,
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			     int width, int height, int top_p)
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{
  cairo_t *cr;

  cr = x_begin_cr_clip (f, gc);
  x_set_cr_source_with_gc_foreground (f, gc);
  cairo_move_to (cr, top_p ? x : x + height, y);
  cairo_line_to (cr, x, y + height);
  cairo_line_to (cr, top_p ? x + width - height : x + width, y + height);
  cairo_line_to (cr, x + width, y);
  cairo_fill (cr);
  x_end_cr_clip (f);
}
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enum corners
  {
    CORNER_BOTTOM_RIGHT,	/* 0 -> pi/2 */
    CORNER_BOTTOM_LEFT,		/* pi/2 -> pi */
    CORNER_TOP_LEFT,		/* pi -> 3pi/2 */
    CORNER_TOP_RIGHT,		/* 3pi/2 -> 2pi */
    CORNER_LAST
  };

static void
x_erase_corners_for_relief (struct frame *f, GC gc, int x, int y,
			    int width, int height,
			    double radius, double margin, int corners)
{
  cairo_t *cr;
  int i;

  cr = x_begin_cr_clip (f, gc);
  x_set_cr_source_with_gc_background (f, gc);
  for (i = 0; i < CORNER_LAST; i++)
    if (corners & (1 << i))
      {
	double xm, ym, xc, yc;

	if (i == CORNER_TOP_LEFT || i == CORNER_BOTTOM_LEFT)
	  xm = x - margin, xc = xm + radius;
	else
	  xm = x + width + margin, xc = xm - radius;
	if (i == CORNER_TOP_LEFT || i == CORNER_TOP_RIGHT)
	  ym = y - margin, yc = ym + radius;
	else
	  ym = y + height + margin, yc = ym - radius;

	cairo_move_to (cr, xm, ym);
	cairo_arc (cr, xc, yc, radius, i * M_PI_2, (i + 1) * M_PI_2);
      }
  cairo_clip (cr);
  cairo_rectangle (cr, x, y, width, height);
  cairo_fill (cr);
  x_end_cr_clip (f);
}

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static void
x_draw_horizontal_wave (struct frame *f, GC gc, int x, int y,
			int width, int height, int wave_length)
{
  cairo_t *cr;
  double dx = wave_length, dy = height - 1;
  int xoffset, n;

  cr = x_begin_cr_clip (f, gc);
  x_set_cr_source_with_gc_foreground (f, gc);
  cairo_rectangle (cr, x, y, width, height);
  cairo_clip (cr);

  if (x >= 0)
    {
      xoffset = x % (wave_length * 2);
      if (xoffset == 0)
	xoffset = wave_length * 2;
    }
  else
    xoffset = x % (wave_length * 2) + wave_length * 2;
  n = (width + xoffset) / wave_length + 1;
  if (xoffset > wave_length)
    {
      xoffset -= wave_length;
      --n;
      y += height - 1;
      dy = -dy;
    }

  cairo_move_to (cr, x - xoffset + 0.5, y + 0.5);
  while (--n >= 0)
    {
      cairo_rel_line_to (cr, dx, dy);
      dy = -dy;
    }
  cairo_set_line_width (cr, 1);
  cairo_stroke (cr);
  x_end_cr_clip (f);
}
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#endif
868

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/* Return the struct x_display_info corresponding to DPY.  */

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

  for (dpyinfo = x_display_list; dpyinfo; dpyinfo = dpyinfo->next)
    if (dpyinfo->display == dpy)
      return dpyinfo;
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  return 0;
}
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static Window
x_find_topmost_parent (struct frame *f)
{
  struct x_output *x = f->output_data.x;
  Window win = None, wi = x->parent_desc;
  Display *dpy = FRAME_X_DISPLAY (f);

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  while (wi != FRAME_DISPLAY_INFO (f)->root_window)
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    {
      Window root;
      Window *children;
      unsigned int nchildren;

      win = wi;
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      if (XQueryTree (dpy, win, &root, &wi, &children, &nchildren))
	XFree (children);
      else
	break;
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    }

  return win;
}

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#define OPAQUE  0xffffffff

void
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x_set_frame_alpha (struct frame *f)
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{
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  struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
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  Display *dpy = FRAME_X_DISPLAY (f);
  Window win = FRAME_OUTER_WINDOW (f);
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  double alpha = 1.0;
  double alpha_min = 1.0;
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  unsigned long opac;
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  Window parent;
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  if (dpyinfo->x_highlight_frame == f)
    alpha = f->alpha[0];
  else
    alpha = f->alpha[1];

  if (FLOATP (Vframe_alpha_lower_limit))
    alpha_min = XFLOAT_DATA (Vframe_alpha_lower_limit);
  else if (INTEGERP (Vframe_alpha_lower_limit))
    alpha_min = (XINT (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 (0.0 <= alpha && alpha < alpha_min && alpha_min <= 1.0)
    alpha = alpha_min;

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  opac = alpha * OPAQUE;
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  x_catch_errors (dpy);

  /* If there is a parent from the window manager, put the property there
     also, to work around broken window managers that fail to do that.
     Do this unconditionally as this function is called on reparent when
     alpha has not changed on the frame.  */

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  if (!FRAME_PARENT_FRAME (f))
    {
      parent = x_find_topmost_parent (f);
      if (parent != None)
	XChangeProperty (dpy, parent, dpyinfo->Xatom_net_wm_window_opacity,
			 XA_CARDINAL, 32, PropModeReplace,
			 (unsigned char *) &opac, 1);
    }
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  /* return unless necessary */
  {
    unsigned char *data;
    Atom actual;
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    int rc, format;
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    unsigned long n, left;

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    rc = XGetWindowProperty (dpy, win, dpyinfo->Xatom_net_wm_window_opacity,
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			     0, 1, False, XA_CARDINAL,
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			     &actual, &format, &n, &left,
			     &data);
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    if (rc == Success && actual != None)
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      {
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        unsigned long value = *(unsigned long *)data;
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	XFree (data);
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	if (value == opac)
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	  {
	    x_uncatch_errors ();
	    return;
	  }
      }
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  }

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  XChangeProperty (dpy, win, dpyinfo->Xatom_net_wm_window_opacity,
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		   XA_CARDINAL, 32, PropModeReplace,
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		   (unsigned char *) &opac, 1);
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  x_uncatch_errors ();
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}
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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.
   This function is called prior to calls to x_update_window_begin for
   each window being updated.  Currently, there is nothing to do here
   because all interesting stuff is done on a window basis.  */
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static void
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x_update_begin (struct frame *f)
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{
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#ifdef USE_CAIRO
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  if (! NILP (tip_frame) && XFRAME (tip_frame) == f
      && ! FRAME_VISIBLE_P (f))
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    return;

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  if (! FRAME_CR_SURFACE (f))
    {
      int width, height;
#ifdef USE_GTK
      if (FRAME_GTK_WIDGET (f))
        {
          GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
          width = gdk_window_get_width (w);
          height = gdk_window_get_height (w);
        }
      else
#endif
        {
          width = FRAME_PIXEL_WIDTH (f);
          height = FRAME_PIXEL_HEIGHT (f);
          if (! FRAME_EXTERNAL_TOOL_BAR (f))
            height += FRAME_TOOL_BAR_HEIGHT (f);
          if (! FRAME_EXTERNAL_MENU_BAR (f))
            height += FRAME_MENU_BAR_HEIGHT (f);
        }
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      if (width > 0 && height > 0)
        {
          block_input();
          FRAME_CR_SURFACE (f) = cairo_image_surface_create
            (CAIRO_FORMAT_ARGB32, width, height);
          unblock_input();
        }
    }
#endif /* USE_CAIRO */
}
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/* Start update of window W.  */
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static void
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x_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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  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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    {
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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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    }
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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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x_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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  struct face *face;

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  face = FACE_FROM_ID_OR_NULL (f, VERTICAL_BORDER_FACE_ID);
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  if (face)
    XSetForeground (FRAME_X_DISPLAY (f), f->output_data.x->normal_gc,
		    face->foreground);
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#ifdef USE_CAIRO
  x_fill_rectangle (f, f->output_data.x->normal_gc, x, y0, 1, y1 - y0);
#else
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  XDrawLine (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
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	     f->output_data.x->normal_gc, x, y0, x, y1);
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#endif
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}
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/* Draw a window divider from (x0,y0) to (x1,y1)  */

static void
x_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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  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));
  Display *display = FRAME_X_DISPLAY (f);

  if (y1 - y0 > x1 - x0 && x1 - x0 > 2)
    /* Vertical.  */
    {
      XSetForeground (display, f->output_data.x->normal_gc, color_first);
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      x_fill_rectangle (f, f->output_data.x->normal_gc,
			x0, y0, 1, y1 - y0);
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      XSetForeground (display, f->output_data.x->normal_gc, color);
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      x_fill_rectangle (f, f->output_data.x->normal_gc,
			x0 + 1, y0, x1 - x0 - 2, y1 - y0);
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      XSetForeground (display, f->output_data.x->normal_gc, color_last);
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      x_fill_rectangle (f, f->output_data.x->normal_gc,
			x1 - 1, y0, 1, y1 - y0);
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    }
  else if (x1 - x0 > y1 - y0 && y1 - y0 > 3)
    /* Horizontal.  */
    {
      XSetForeground (display, f->output_data.x->normal_gc, color_first);
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      x_fill_rectangle (f, f->output_data.x->normal_gc,
			x0, y0, x1 - x0, 1);
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      XSetForeground (display, f->output_data.x->normal_gc, color);
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      x_fill_rectangle (f, f->output_data.x->normal_gc,
			x0, y0 + 1, x1 - x0, y1 - y0 - 2);
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      XSetForeground (display, f->output_data.x->normal_gc, color_last);
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      x_fill_rectangle (f, f->output_data.x->normal_gc,
			x0, y1 - 1, x1 - x0, 1);
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    }
  else
    {
      XSetForeground (display, f->output_data.x->normal_gc, color);
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      x_fill_rectangle (f, f->output_data.x->normal_gc,
			x0, y0, x1 - x0, y1 - y0);
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    }
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}

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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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x_update_window_end (struct window *w, bool cursor_on_p,
		     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))
	    x_draw_right_divider (w);
	  else
	    x_draw_vertical_border (w);
	}
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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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}
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/* Show the frame back buffer.  If frame is double-buffered,
   atomically publish to the user's screen graphics updates made since
   the last call to show_back_buffer.  */
static void
show_back_buffer (struct frame *f)
{
  block_input ();
  if (FRAME_X_DOUBLE_BUFFERED_P (f))
    {
#ifdef HAVE_XDBE
      XdbeSwapInfo swap_info;
      memset (&swap_info, 0, sizeof (swap_info));
      swap_info.swap_window = FRAME_X_WINDOW (f);
      swap_info.swap_action = XdbeCopied;
      XdbeSwapBuffers (FRAME_X_DISPLAY (f), &swap_info, 1);
#else
      eassert (!"should have back-buffer only with XDBE");
#endif
    }
  FRAME_X_NEED_BUFFER_FLIP (f) = false;
  unblock_input ();
}

/* Updates back buffer and flushes changes to display.  Called from
   minibuf read code.  Note that we display the back buffer even if
   buffer flipping is blocked.  */
static void
x_flip_and_flush (struct frame *f)
{
  block_input ();
  if (FRAME_X_NEED_BUFFER_FLIP (f))
      show_back_buffer (f);
  x_flush (f);
  unblock_input ();
}
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/* End update of frame F.  This function is installed as a hook in
   update_end.  */

static void
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x_update_end (struct frame *f)
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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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#ifdef USE_CAIRO
  if (FRAME_CR_SURFACE (f))
    {
      cairo_t *cr = 0;
      block_input();
#if defined (USE_GTK) && defined (HAVE_GTK3)
      if (FRAME_GTK_WIDGET (f))
        {
          GdkWindow *w = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
          cr = gdk_cairo_create (w);
        }
      else
#endif
        {
          cairo_surface_t *surface;
          int width = FRAME_PIXEL_WIDTH (f);
          int height = FRAME_PIXEL_HEIGHT (f);
          if (! FRAME_EXTERNAL_TOOL_BAR (f))
            height += FRAME_TOOL_BAR_HEIGHT (f);
          if (! FRAME_EXTERNAL_MENU_BAR (f))
            height += FRAME_MENU_BAR_HEIGHT (f);
          surface = cairo_xlib_surface_create (FRAME_X_DISPLAY (f),
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                                               FRAME_X_DRAWABLE (f),
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                                               FRAME_DISPLAY_INFO (f)->visual,
                                               width,
                                               height);
          cr = cairo_create (surface);
          cairo_surface_destroy (surface);
        }

      cairo_set_source_surface (cr, FRAME_CR_SURFACE (f), 0, 0);
      cairo_paint (cr);
      cairo_destroy (cr);
      unblock_input ();
    }
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#endif
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#ifndef XFlush
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  block_input ();
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  XFlush (FRAME_X_DISPLAY (f));
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  unblock_input ();
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#endif
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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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XTframe_up_to_date (struct frame *f)
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{
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  eassert (FRAME_X_P (f));
  block_input ();
  FRAME_MOUSE_UPDATE (f);
  if (!buffer_flipping_blocked_p () && FRAME_X_NEED_BUFFER_FLIP (f))
    show_back_buffer (f);
  unblock_input ();
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}
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static void
XTbuffer_flipping_unblocked_hook (struct frame *f)
{
  if (FRAME_X_NEED_BUFFER_FLIP (f))
    show_back_buffer (f);
}
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/**
 * x_clear_under_internal_border:
 *
 * Clear area of frame F's internal border.  If the internal border face
 * of F has been specified (is not null), fill the area with that face.
 */
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void
x_clear_under_internal_border (struct frame *f)
{
  if (FRAME_INTERNAL_BORDER_WIDTH (f) > 0)
    {
      int border = FRAME_INTERNAL_BORDER_WIDTH (f);
      int width = FRAME_PIXEL_WIDTH (f);
      int height = FRAME_PIXEL_HEIGHT (f);
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#ifdef USE_GTK
      int margin = 0;
#else