master 996daa00ae: Implement frame resize synchronization on GTK 3

[Po Lu]

branch: master
commit 996daa00ae3cab514a0f9fca0ee8b108f220677e
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Implement frame resize synchronization on GTK 3
    
    * src/xterm.c (XTframe_up_to_date):
    (handle_one_xevent): Use the GTK frame clock to implement frame
    resize synchronization.
    
    * src/xterm.h (struct x_output): New variable
    `xg_sync_end_pending_p'.
---
 src/xterm.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
 src/xterm.h |  3 +++
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 8bdb3c9ea1..9b48006927 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -1848,10 +1848,14 @@ x_update_end (struct frame *f)
 static void
 XTframe_up_to_date (struct frame *f)
 {
-#ifdef HAVE_XSYNC
+#if defined HAVE_XSYNC && !defined HAVE_GTK3
   XSyncValue add;
   XSyncValue current;
   Bool overflow_p;
+#elif defined HAVE_XSYNC
+  GtkWidget *widget;
+  GdkWindow *window;
+  GdkFrameClock *clock;
 #endif
 
   eassert (FRAME_X_P (f));
@@ -1861,6 +1865,7 @@ XTframe_up_to_date (struct frame *f)
     show_back_buffer (f);
 
 #ifdef HAVE_XSYNC
+#ifndef HAVE_GTK3
   if (FRAME_X_OUTPUT (f)->sync_end_pending_p
       && FRAME_X_BASIC_COUNTER (f) != None)
     {
@@ -1892,6 +1897,20 @@ XTframe_up_to_date (struct frame *f)
 
       FRAME_X_OUTPUT (f)->ext_sync_end_pending_p = false;
     }
+#else
+  if (FRAME_X_OUTPUT (f)->xg_sync_end_pending_p)
+    {
+      widget = FRAME_GTK_OUTER_WIDGET (f);
+      window = gtk_widget_get_window (widget);
+      eassert (window);
+      clock = gdk_window_get_frame_clock (window);
+      eassert (clock);
+
+      gdk_frame_clock_request_phase (clock,
+                                    GDK_FRAME_CLOCK_PHASE_AFTER_PAINT);
+      FRAME_X_OUTPUT (f)->xg_sync_end_pending_p = false;
+    }
+#endif
 #endif
   unblock_input ();
 }
@@ -9130,7 +9149,7 @@ handle_one_xevent (struct x_display_info *dpyinfo,
                goto done;
              }
 
-#if defined HAVE_XSYNC && !defined HAVE_GTK3
+#if defined HAVE_XSYNC
            if (event->xclient.data.l[0] == dpyinfo->Xatom_net_wm_sync_request
                && event->xclient.format == 32
                && dpyinfo->xsync_supported_p)
@@ -9138,9 +9157,15 @@ handle_one_xevent (struct x_display_info *dpyinfo,
                struct frame *f
                  = x_top_window_to_frame (dpyinfo,
                                           event->xclient.window);
+#if defined HAVE_GTK3
+               GtkWidget *widget;
+               GdkWindow *window;
+               GdkFrameClock *frame_clock;
+#endif
 
                if (f)
                  {
+#ifndef HAVE_GTK3
                    if (event->xclient.data.l[4] == 0)
                      {
                        XSyncIntsToValue (&FRAME_X_OUTPUT 
(f)->pending_basic_counter_value,
@@ -9155,6 +9180,22 @@ handle_one_xevent (struct x_display_info *dpyinfo,
                      }
 
                    *finish = X_EVENT_DROP;
+#else
+                   widget = FRAME_GTK_OUTER_WIDGET (f);
+
+                   if (widget && !FRAME_X_OUTPUT (f)->xg_sync_end_pending_p)
+                     {
+                       window = gtk_widget_get_window (widget);
+                       eassert (window);
+                       frame_clock = gdk_window_get_frame_clock (window);
+                       eassert (frame_clock);
+
+                       gdk_frame_clock_request_phase (frame_clock,
+                                                      
GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT);
+
+                       FRAME_X_OUTPUT (f)->xg_sync_end_pending_p = true;
+                     }
+#endif
                    goto done;
                  }
              }
diff --git a/src/xterm.h b/src/xterm.h
index 854d87c83c..1ce3e7a6cf 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -822,6 +822,9 @@ struct x_output
 
   bool_bf sync_end_pending_p : 1;
   bool_bf ext_sync_end_pending_p : 1;
+#ifdef HAVE_GTK3
+  bool_bf xg_sync_end_pending_p : 1;
+#endif
 #endif
 
   /* Relief GCs, colors etc.  */