[PULL 5/5] ui/gtk: Update refresh interval after widget is realized

[Gerd Hoffmann <kraxel@redhat.com>]

From: Philippe Mathieu-Daudé <philmd@redhat.com>

Nikola reported on Windows when gd_vc_gfx_init() is called, the
window is not yet realized, so we run gd_refresh_rate_millihz(NULL)
which returns 0 milli-Hertz.
When a Widget is realized, it fires a 'realized' event. We already
have the gd_draw_event() handler registered for this even, so simply
move the gd_refresh_rate_millihz() there. When the event fires, the
window is known to exist.
This completes commit c4c00922cc original intention.

Reported-by: Nikola Pavlica <pavlica.nikola@gmail.com>
Tested-by: Nikola Pavlica <pavlica.nikola@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200817172331.598255-1-philmd@redhat.com
Suggested-by: Nikola Pavlica <pavlica.nikola@gmail.com>
Tested-by: Nikola Pavlica <pavlica.nikola@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/gtk.c | 52 ++++++++++++++++++++++++++--------------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/ui/gtk.c b/ui/gtk.c
index b0cc08ad6da7..7a717ce8e5e4 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -744,6 +744,25 @@ static void gd_resize_event(GtkGLArea *area,
 
 #endif
 
+/*
+ * If available, return the refresh rate of the display in milli-Hertz,
+ * else return 0.
+ */
+static int gd_refresh_rate_millihz(GtkWidget *window)
+{
+#ifdef GDK_VERSION_3_22
+    GdkWindow *win = gtk_widget_get_window(window);
+
+    if (win) {
+        GdkDisplay *dpy = gtk_widget_get_display(window);
+        GdkMonitor *monitor = gdk_display_get_monitor_at_window(dpy, win);
+
+        return gdk_monitor_get_refresh_rate(monitor);
+    }
+#endif
+    return 0;
+}
+
 static gboolean gd_draw_event(GtkWidget *widget, cairo_t *cr, void *opaque)
 {
     VirtualConsole *vc = opaque;
@@ -751,6 +770,7 @@ static gboolean gd_draw_event(GtkWidget *widget, cairo_t *cr, void *opaque)
     int mx, my;
     int ww, wh;
     int fbw, fbh;
+    int refresh_rate_millihz;
 
 #if defined(CONFIG_OPENGL)
     if (vc->gfx.gls) {
@@ -771,6 +791,12 @@ static gboolean gd_draw_event(GtkWidget *widget, cairo_t *cr, void *opaque)
         return FALSE;
     }
 
+    refresh_rate_millihz = gd_refresh_rate_millihz(vc->window ?
+                                                   vc->window : s->window);
+    if (refresh_rate_millihz) {
+        vc->gfx.dcl.update_interval = MILLISEC_PER_SEC / refresh_rate_millihz;
+    }
+
     fbw = surface_width(vc->gfx.ds);
     fbh = surface_height(vc->gfx.ds);
 
@@ -1949,31 +1975,11 @@ static GtkWidget *gd_create_menu_machine(GtkDisplayState *s)
     return machine_menu;
 }
 
-/*
- * If available, return the refresh rate of the display in milli-Hertz,
- * else return 0.
- */
-static int gd_refresh_rate_millihz(GtkWidget *window)
-{
-#ifdef GDK_VERSION_3_22
-    GdkWindow *win = gtk_widget_get_window(window);
-
-    if (win) {
-        GdkDisplay *dpy = gtk_widget_get_display(window);
-        GdkMonitor *monitor = gdk_display_get_monitor_at_window(dpy, win);
-
-        return gdk_monitor_get_refresh_rate(monitor);
-    }
-#endif
-    return 0;
-}
-
 static GSList *gd_vc_gfx_init(GtkDisplayState *s, VirtualConsole *vc,
                               QemuConsole *con, int idx,
                               GSList *group, GtkWidget *view_menu)
 {
     bool zoom_to_fit = false;
-    int refresh_rate_millihz;
 
     vc->label = qemu_console_get_label(con);
     vc->s = s;
@@ -2031,12 +2037,6 @@ static GSList *gd_vc_gfx_init(GtkDisplayState *s, VirtualConsole *vc,
     vc->gfx.kbd = qkbd_state_init(con);
     vc->gfx.dcl.con = con;
 
-    refresh_rate_millihz = gd_refresh_rate_millihz(vc->window ?
-                                                   vc->window : s->window);
-    if (refresh_rate_millihz) {
-        vc->gfx.dcl.update_interval = MILLISEC_PER_SEC / refresh_rate_millihz;
-    }
-
     register_displaychangelistener(&vc->gfx.dcl);
 
     gd_connect_vc_gfx_signals(vc);
-- 
2.27.0