console: add API to get underlying gui window ID

This adds two console functions, qemu_console_set_window_id and
qemu_graphic_console_get_window_id, to let graphical backend record the
window id in the QemuConsole structure, and let the baum driver read it.
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>
Message-id: 20161221003806.22412-2-samuel.thibault@ens-lyon.org
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

include/ui/console.h

@@ -394,6 +394,10 @@ uint32_t qemu_console_get_head(QemuConsole *con);
 QemuUIInfo *qemu_console_get_ui_info(QemuConsole *con);
 int qemu_console_get_width(QemuConsole *con, int fallback);
 int qemu_console_get_height(QemuConsole *con, int fallback);
+/* Return the low-level window id for the console */
+int qemu_console_get_window_id(QemuConsole *con);
+/* Set the low-level window id for the console */
+void qemu_console_set_window_id(QemuConsole *con, int window_id);
 
 void console_select(unsigned int index);
 void qemu_console_resize(QemuConsole *con, int width, int height);

ui/console.c

@@ -124,6 +124,7 @@ struct QemuConsole {
     int dcls;
     DisplayChangeListener *gl;
     bool gl_block;
+    int window_id;
 
     /* Graphic console state.  */
     Object *device;
@@ -273,6 +274,16 @@ void graphic_hw_gl_block(QemuConsole *con, bool block)
     }
 }
 
+int qemu_console_get_window_id(QemuConsole *con)
+{
+    return con->window_id;
+}
+
+void qemu_console_set_window_id(QemuConsole *con, int window_id)
+{
+    con->window_id = window_id;
+}
+
 void graphic_hw_invalidate(QemuConsole *con)
 {
     if (!con) {