[PATCH v5 2/2] ui/gtk: a new array param monitor to specify the target displays

[Dongwon Kim <dongwon.kim@intel.com>]

New integer array parameter, 'monitor' is for specifying the target
monitors where individual GTK windows are placed upon launching.

Monitor numbers in the array are associated with virtual consoles
in the order of [VC0, VC1, VC2 ... VCn].

Every GTK window containing each VC will be placed in the region
of corresponding monitors.

Usage: -display gtk,monitor.<id of VC>=<target monitor>,..
       ex)-display gtk,monitor.0=1,monitor.1=0

Cc: Daniel P. Berrangé <berrange@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
---
 qapi/ui.json    |  9 ++++++++-
 qemu-options.hx |  3 ++-
 ui/gtk.c        | 30 ++++++++++++++++++++++++++++--
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/qapi/ui.json b/qapi/ui.json
index 413371d5e8..ccc3e56f80 100644
--- a/qapi/ui.json
+++ b/qapi/ui.json
@@ -1195,12 +1195,19 @@
 #               assuming the guest will resize the display to match
 #               the window size then.  Otherwise it defaults to "off".
 #               Since 3.1
+# @monitor:     List of physical monitor numbers where the GTK windows
+#               containing the virtual consoles VC0, VC1, ... are to be
+#               placed. If a mapping exists for a VC, then it is to be
+#               placed on that specific physical monitor; otherwise,
+#               it defaults to the monitor from where it was launched.
+#               (Since 7.1)
 #
 # Since: 2.12
 ##
 { 'struct'  : 'DisplayGTK',
   'data'    : { '*grab-on-hover' : 'bool',
-                '*zoom-to-fit'   : 'bool'  } }
+                '*zoom-to-fit'   : 'bool',
+                '*monitor'       : ['uint16']  } }
 
 ##
 # @DisplayEGLHeadless:
diff --git a/qemu-options.hx b/qemu-options.hx
index 377d22fbd8..aabdfb0636 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1938,7 +1938,8 @@ DEF("display", HAS_ARG, QEMU_OPTION_display,
 #endif
 #if defined(CONFIG_GTK)
     "-display gtk[,full-screen=on|off][,gl=on|off][,grab-on-hover=on|off]\n"
-    "            [,show-cursor=on|off][,window-close=on|off]\n"
+    "            [,monitor.<id of VC>=<monitor number>][,show-cursor=on|off]"
+    "            [,window-close=on|off]\n"
 #endif
 #if defined(CONFIG_VNC)
     "-display vnc=<display>[,<optargs>]\n"
diff --git a/ui/gtk.c b/ui/gtk.c
index e6878c3209..7dad10b761 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -2316,6 +2316,10 @@ static void gtk_display_init(DisplayState *ds, DisplayOptions *opts)
     GtkDisplayState *s = g_malloc0(sizeof(*s));
     GdkDisplay *window_display;
     GtkIconTheme *theme;
+    GtkWidget *win;
+    GdkRectangle dest;
+    uint16List *mon;
+    int n_mon;
     int i;
     char *dir;
 
@@ -2393,10 +2397,32 @@ static void gtk_display_init(DisplayState *ds, DisplayOptions *opts)
             gtk_menu_item_activate(GTK_MENU_ITEM(s->untabify_item));
         }
     }
-    if (opts->has_full_screen &&
-        opts->full_screen) {
+
+    if (opts->u.gtk.has_monitor) {
+        i = 0;
+        n_mon = gdk_display_get_n_monitors(window_display);
+        for (mon = opts->u.gtk.monitor; mon; mon = mon->next) {
+            if (mon->value < n_mon && i < s->nb_vcs) {
+                win = s->vc[i].window ? s->vc[i].window : s->window;
+                if (opts->full_screen) {
+                    gtk_window_fullscreen_on_monitor(
+                        GTK_WINDOW(win),
+                        gdk_display_get_default_screen(window_display),
+                        mon->value);
+                } else {
+                    gdk_monitor_get_geometry(
+                        gdk_display_get_monitor(window_display, mon->value),
+                        &dest);
+                    gtk_window_move(GTK_WINDOW(win),
+                                    dest.x, dest.y);
+                }
+                i++;
+            }
+        }
+    } else if (opts->full_screen) {
         gtk_menu_item_activate(GTK_MENU_ITEM(s->full_screen_item));
     }
+
     if (opts->u.gtk.has_grab_on_hover &&
         opts->u.gtk.grab_on_hover) {
         gtk_menu_item_activate(GTK_MENU_ITEM(s->grab_on_hover_item));
-- 
2.20.1