common: Add a xfwm_monitor_is_primary function

It's a shorthand for gdk_monitor_is_primary when working from a screen.

Signed-off-by: Dridi Boukelmoune <dridi@fedoraproject.org>

common/xfwm-common.c

@@ -173,6 +173,25 @@ xfwm_get_primary_refresh_rate (GdkScreen *screen)
 
 
 
+gboolean
+xfwm_monitor_is_primary (GdkScreen *screen,
+                         gint      monitor_num)
+{
+#if GTK_CHECK_VERSION(3, 22, 0)
+  GdkDisplay *display;
+  GdkMonitor *monitor;
+
+  display = gdk_screen_get_display (screen);
+  monitor = gdk_display_get_monitor (display, monitor_num);
+
+  return gdk_monitor_is_primary (monitor);
+#else
+  return gdk_screen_get_primary_monitor (screen) == monitor_num;
+#endif
+}
+
+
+
 gint
 xfwm_get_n_monitors (GdkScreen *screen)
 {

common/xfwm-common.h

@@ -40,6 +40,9 @@ gboolean          xfwm_get_primary_monitor_geometry     (GdkScreen    *screen,
 
 gint              xfwm_get_primary_refresh_rate         (GdkScreen    *screen);
 
+gboolean          xfwm_monitor_is_primary               (GdkScreen *screen,
+                                                         gint      monitor_num);
+
 gint              xfwm_get_n_monitors                   (GdkScreen    *screen);
 
 gchar            *xfwm_make_display_name                (GdkScreen    *screen);