If available, use Xfixes extension to do pointer blanking.

* configure.ac (HAVE_XFIXES): Define if available.
(XFIXES_CFLAGS, XFIXES_LIBS): New AC_SUBSTs.
* src/Makefile.in (XFIXES_CFLAGS, XFIXES_LIBS): New var.
* src/xfns.c (x_set_mouse_color): Do not call make_invisible_cursor here.
(make_invisible_cursor): Move to...
* src/xterm.c (make_invisible_cursor): ...here.
(x_probe_xfixes_extension, xfixes_toggle_visible_pointer)
(x_toggle_visible_pointer, x_setup_pointer_blanking): New functions.
(x_term_init): Call to x_setup_pointer_blanking.
(XTtoggle_invisible_pointer): Use blanking specific to this display.
* src/xterm.h (struct x_display_info): New member toggle_visible_pointer.

5 files changed, 120 insertions, 46 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index cc16cf8f274..e79c163cb0c 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,16 @@
+2014-05-13  Dmitry Antipov  <dmantipov@yandex.ru>
+
+        If available, use Xfixes extension to do pointer blanking.
+        * Makefile.in (XFIXES_CFLAGS, XFIXES_LIBS): New var.
+        * xfns.c (x_set_mouse_color): Do not call make_invisible_cursor here.
+        (make_invisible_cursor): Move to...
+        * xterm.c (make_invisible_cursor): ...here.
+        (x_probe_xfixes_extension, xfixes_toggle_visible_pointer)
+        (x_toggle_visible_pointer, x_setup_pointer_blanking): New functions.
+        (x_term_init): Call to x_setup_pointer_blanking.
+        (XTtoggle_invisible_pointer): Use blanking specific to this display.
+        * xterm.h (struct x_display_info): New member toggle_visible_pointer.
+
 2014-05-12  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
 
         * xdisp.c (draw_glyphs): Set clipping to highlight boundaries.
diff --git a/src/Makefile.in b/src/Makefile.in
index c35e38bb290..b4e9eae330b 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -231,6 +231,9 @@ XRANDR_CFLAGS = @XRANDR_CFLAGS@
 XINERAMA_LIBS = @XINERAMA_LIBS@
 XINERAMA_CFLAGS = @XINERAMA_CFLAGS@
 
+XFIXES_LIBS = @XFIXES_LIBS@
+XFIXES_CFLAGS = @XFIXES_CFLAGS@
+
 ## widget.o if USE_X_TOOLKIT, otherwise empty.
 WIDGET_OBJ=@WIDGET_OBJ@
 
@@ -326,8 +329,8 @@ ALL_CFLAGS=-Demacs $(MYCPPFLAGS) -I. -I$(srcdir) \
   -I$(lib) -I$(srcdir)/../lib \
   $(C_SWITCH_MACHINE) $(C_SWITCH_SYSTEM) $(C_SWITCH_X_SITE) \
   $(GNUSTEP_CFLAGS) $(CFLAGS_SOUND) $(RSVG_CFLAGS) $(IMAGEMAGICK_CFLAGS) \
-  $(PNG_CFLAGS) \
-  $(LIBXML2_CFLAGS) $(DBUS_CFLAGS) $(XRANDR_CFLAGS) $(XINERAMA_CFLAGS) \
+  $(PNG_CFLAGS) $(LIBXML2_CFLAGS) $(DBUS_CFLAGS) \
+  $(XRANDR_CFLAGS) $(XINERAMA_CFLAGS) $(XFIXES_CFLAGS) \
   $(SETTINGS_CFLAGS) $(FREETYPE_CFLAGS) $(FONTCONFIG_CFLAGS) \
   $(LIBOTF_CFLAGS) $(M17N_FLT_CFLAGS) $(DEPFLAGS) \
   $(LIBGNUTLS_CFLAGS) $(GFILENOTIFY_CFLAGS) \
@@ -407,7 +410,7 @@ LIBES = $(LIBS) $(W32_LIBS) $(LIBS_GNUSTEP) $(LIBX_BASE) $(LIBIMAGE) \
    $(LIBX_OTHER) $(LIBSOUND) \
    $(RSVG_LIBS) $(IMAGEMAGICK_LIBS) $(LIB_ACL) $(LIB_CLOCK_GETTIME) \
    $(LIB_EACCESS) $(LIB_FDATASYNC) $(LIB_TIMER_TIME) $(DBUS_LIBS) \
-   $(LIB_EXECINFO) $(XRANDR_LIBS) $(XINERAMA_LIBS) \
+   $(LIB_EXECINFO) $(XRANDR_LIBS) $(XINERAMA_LIBS) $(XFIXES_LIBS) \
    $(LIBXML2_LIBS) $(LIBGPM) $(LIBRESOLV) $(LIBS_SYSTEM) \
    $(LIBS_TERMCAP) $(GETLOADAVG_LIBS) $(SETTINGS_LIBS) $(LIBSELINUX_LIBS) \
    $(FREETYPE_LIBS) $(FONTCONFIG_LIBS) $(LIBOTF_LIBS) $(M17N_FLT_LIBS) \
diff --git a/src/xfns.c b/src/xfns.c
index 13b4c6e7879..8e00a1cfbd6 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -577,35 +577,6 @@ x_set_background_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
     }
 }
 
-static Cursor
-make_invisible_cursor (struct frame *f)
-{
-  Display *dpy = FRAME_X_DISPLAY (f);
-  static char const no_data[] = { 0 };
-  Pixmap pix;
-  XColor col;
-  Cursor c = 0;
-
-  x_catch_errors (dpy);
-  pix = XCreateBitmapFromData (dpy, FRAME_DISPLAY_INFO (f)->root_window,
-                               no_data, 1, 1);
-  if (! x_had_errors_p (dpy) && pix != None)
-    {
-      Cursor pixc;
-      col.pixel = 0;
-      col.red = col.green = col.blue = 0;
-      col.flags = DoRed | DoGreen | DoBlue;
-      pixc = XCreatePixmapCursor (dpy, pix, pix, &col, &col, 0, 0);
-      if (! x_had_errors_p (dpy) && pixc != None)
-        c = pixc;
-      XFreePixmap (dpy, pix);
-    }
-
-  x_uncatch_errors ();
-
-  return c;
-}
-
 static void
 x_set_mouse_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 {
@@ -723,9 +694,6 @@ x_set_mouse_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
     XDefineCursor (dpy, FRAME_X_WINDOW (f),
                    f->output_data.x->current_cursor = cursor);
 
-  if (FRAME_DISPLAY_INFO (f)->invisible_cursor == 0)
-    FRAME_DISPLAY_INFO (f)->invisible_cursor = make_invisible_cursor (f);
-
   if (cursor != x->text_cursor
       && x->text_cursor != 0)
     XFreeCursor (dpy, x->text_cursor);
diff --git a/src/xterm.c b/src/xterm.c
index 85daee66717..5c21bfae144 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -32,6 +32,11 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "xterm.h"
 #include <X11/cursorfont.h>
 
+/* If we have Xfixes extension, use it for pointer blanking.  */
+#ifdef HAVE_XFIXES
+#include <X11/extensions/Xfixes.h>
+#endif
+
 /* Load sys/types.h if not already loaded.
    In some systems loading it twice is suicidal.  */
 #ifndef makedev
@@ -3096,16 +3101,7 @@ static void
 XTtoggle_invisible_pointer (struct frame *f, int invisible)
 {
   block_input ();
-  if (invisible)
-    {
-      if (FRAME_DISPLAY_INFO (f)->invisible_cursor != 0)
-        XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
-                       FRAME_DISPLAY_INFO (f)->invisible_cursor);
-    }
-  else
-    XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
-                   f->output_data.x->current_cursor);
-  f->pointer_invisible = invisible;
+  FRAME_DISPLAY_INFO (f)->toggle_visible_pointer (f, invisible);
   unblock_input ();
 }
 
@@ -9720,6 +9716,94 @@ my_log_handler (const gchar *log_domain, GLogLevelFlags log_level,
 }
 #endif
 
+/* Create invisible cursor on X display referred by DPYINFO.  */
+
+static Cursor
+make_invisible_cursor (struct x_display_info *dpyinfo)
+{
+  Display *dpy = dpyinfo->display;
+  static char const no_data[] = { 0 };
+  Pixmap pix;
+  XColor col;
+  Cursor c = 0;
+
+  x_catch_errors (dpy);
+  pix = XCreateBitmapFromData (dpy, dpyinfo->root_window, no_data, 1, 1);
+  if (! x_had_errors_p (dpy) && pix != None)
+    {
+      Cursor pixc;
+      col.pixel = 0;
+      col.red = col.green = col.blue = 0;
+      col.flags = DoRed | DoGreen | DoBlue;
+      pixc = XCreatePixmapCursor (dpy, pix, pix, &col, &col, 0, 0);
+      if (! x_had_errors_p (dpy) && pixc != None)
+        c = pixc;
+      XFreePixmap (dpy, pix);
+    }
+
+  x_uncatch_errors ();
+
+  return c;
+}
+
+/* True if DPY supports Xfixes extension >= 4.  */
+
+static bool
+x_probe_xfixes_extension (Display *dpy)
+{
+#ifdef HAVE_XFIXES
+  int major, minor;
+  return XFixesQueryVersion (dpy, &major, &minor) && major >= 4;
+#else
+  return false;
+#endif /* HAVE_XFIXES */
+}
+
+/* Toggle mouse pointer visibility on frame F by using Xfixes functions.  */
+
+static void
+xfixes_toggle_visible_pointer (struct frame *f, bool invisible)
+{
+#ifdef HAVE_XFIXES
+  if (invisible)
+    XFixesHideCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
+  else
+    XFixesShowCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
+  f->pointer_invisible = invisible;
+#else
+  emacs_abort ();
+#endif /* HAVE_XFIXES */
+}
+
+/* Toggle mouse pointer visibility on frame F by using invisible cursor.  */
+
+static void
+x_toggle_visible_pointer (struct frame *f, bool invisible)
+{
+  eassert (FRAME_DISPLAY_INFO (f)->invisible_cursor != 0);
+  if (invisible)
+    XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                   FRAME_DISPLAY_INFO (f)->invisible_cursor);
+  else
+    XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                   f->output_data.x->current_cursor);
+  f->pointer_invisible = invisible;  
+}
+
+/* Setup pointer blanking, prefer Xfixes if available.  */
+
+static void
+x_setup_pointer_blanking (struct x_display_info *dpyinfo)
+{
+  if (x_probe_xfixes_extension (dpyinfo->display))
+    dpyinfo->toggle_visible_pointer = xfixes_toggle_visible_pointer;
+  else
+    {
+      dpyinfo->toggle_visible_pointer = x_toggle_visible_pointer;
+      dpyinfo->invisible_cursor = make_invisible_cursor (dpyinfo);
+    }
+}
+
 /* Current X display connection identifier.  Incremented for each next
    connection established.  */
 static unsigned x_display_id;
@@ -10148,6 +10232,8 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
                                    gray_bits, gray_width, gray_height,
                                    1, 0, 1);
 
+  x_setup_pointer_blanking (dpyinfo);
+  
 #ifdef HAVE_X_I18N
   xim_initialize (dpyinfo, resource_name);
 #endif
diff --git a/src/xterm.h b/src/xterm.h
index 90d2e131717..3e79de10976 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -174,9 +174,13 @@ struct x_display_info
   /* The cursor to use for vertical scroll bars.  */
   Cursor vertical_scroll_bar_cursor;
 
-  /* The invisible cursor used for pointer blanking.  */
+  /* The invisible cursor used for pointer blanking.
+     Unused if this display supports Xfixes extension.  */
   Cursor invisible_cursor;
 
+  /* Function used to toggle pointer visibility on this display.  */
+  void (*toggle_visible_pointer) (struct frame *, bool);
+
 #ifdef USE_GTK
   /* The GDK cursor for scroll bars and popup menus.  */
   GdkCursor *xg_cursor;