[PATCH RFC 1/1] ui/dbus: add extensible SetUIInfo2 method

[Chengyang Zhu <colazcyg@gmail.com>]

Currently, the `SetUIInfo` method cannot set a refresh rate.
Simply adding a `refresh_rate` argument would break the method signature.

This patch adds:
  * An extensible `SetUIInfo2` method which takes a dictionary as input.
  * A property `QemuUIInfoTypes`
    which exposes the schema of the `SetUIInfo2` method's argument.

Signed-off-by: Chengyang Zhu <colazcyg@gmail.com>
---
 ui/dbus-console.c    | 56 ++++++++++++++++++++++++++++++++++++++++++++
 ui/dbus-display1.xml | 17 ++++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/ui/dbus-console.c b/ui/dbus-console.c
index e1ac06814b..853a8a4087 100644
--- a/ui/dbus-console.c
+++ b/ui/dbus-console.c
@@ -217,6 +217,40 @@ dbus_console_set_ui_info(DBusDisplayConsole *ddc,
     return DBUS_METHOD_INVOCATION_HANDLED;
 }
 
+static gboolean
+dbus_console_set_ui_info2(DBusDisplayConsole *ddc,
+                         GDBusMethodInvocation *invocation,
+                         GVariant *arg_ui_info)
+{
+    if (!qemu_console_ui_info_supported(ddc->dcl.con)) {
+        g_dbus_method_invocation_return_error(invocation,
+                                              DBUS_DISPLAY_ERROR,
+                                              DBUS_DISPLAY_ERROR_UNSUPPORTED,
+                                              "SetUIInfo2 is not supported");
+        return DBUS_METHOD_INVOCATION_HANDLED;
+    }
+
+    GVariantDict ui_info_dict;
+    g_variant_dict_init(&ui_info_dict, arg_ui_info);
+
+    QemuUIInfo info = *qemu_console_get_ui_info(ddc->dcl.con);
+
+    g_variant_dict_lookup(&ui_info_dict, "width_mm", "q", &info.width_mm);
+    g_variant_dict_lookup(&ui_info_dict, "height_mm", "q", &info.height_mm);
+    g_variant_dict_lookup(&ui_info_dict, "xoff", "i", &info.xoff);
+    g_variant_dict_lookup(&ui_info_dict, "yoff", "i", &info.yoff);
+    g_variant_dict_lookup(&ui_info_dict, "width", "u", &info.width);
+    g_variant_dict_lookup(&ui_info_dict, "height", "u", &info.height);
+    g_variant_dict_lookup(&ui_info_dict, "refresh_rate",
+                                         "u", &info.refresh_rate);
+
+    g_variant_dict_clear(&ui_info_dict);
+
+    qemu_console_set_ui_info(ddc->dcl.con, &info, false);
+    qemu_dbus_display1_console_complete_set_uiinfo2(ddc->iface, invocation);
+    return DBUS_METHOD_INVOCATION_HANDLED;
+}
+
 #ifdef G_OS_WIN32
 bool
 dbus_win32_import_socket(GDBusMethodInvocation *invocation,
@@ -538,6 +572,23 @@ QemuConsole *dbus_display_console_get_qemu_console(DBusDisplayConsole *ddc)
     return ddc->dcl.con;
 }
 
+static GVariant *get_qemu_ui_info_types(void)
+{
+    GVariantBuilder builder;
+
+    g_variant_builder_init(&builder, G_VARIANT_TYPE("a{sg}"));
+
+    g_variant_builder_add(&builder, "{sg}", "width_mm", "q");
+    g_variant_builder_add(&builder, "{sg}", "height_mm", "q");
+    g_variant_builder_add(&builder, "{sg}", "xoff", "i");
+    g_variant_builder_add(&builder, "{sg}", "yoff", "i");
+    g_variant_builder_add(&builder, "{sg}", "width", "u");
+    g_variant_builder_add(&builder, "{sg}", "height", "u");
+    g_variant_builder_add(&builder, "{sg}", "refresh_rate", "u");
+
+    return g_variant_builder_end(&builder);
+}
+
 DBusDisplayConsole *
 dbus_display_console_new(DBusDisplay *display, QemuConsole *con)
 {
@@ -575,6 +626,7 @@ dbus_display_console_new(DBusDisplay *display, QemuConsole *con)
         "width", qemu_console_get_width(con, 0),
         "height", qemu_console_get_height(con, 0),
         "device-address", device_addr,
+        "qemu-uiinfo-types", get_qemu_ui_info_types(),
         "interfaces", interfaces,
         NULL);
     g_object_connect(ddc->iface,
@@ -583,6 +635,10 @@ dbus_display_console_new(DBusDisplay *display, QemuConsole *con)
         "swapped-signal::handle-set-uiinfo",
         dbus_console_set_ui_info, ddc,
         NULL);
+    g_object_connect(ddc->iface,
+        "swapped-signal::handle-set-uiinfo2",
+        dbus_console_set_ui_info2, ddc,
+        NULL);
     g_dbus_object_skeleton_add_interface(G_DBUS_OBJECT_SKELETON(ddc),
         G_DBUS_INTERFACE_SKELETON(ddc->iface));
 
diff --git a/ui/dbus-display1.xml b/ui/dbus-display1.xml
index d96bae2ed6..aa1816d02c 100644
--- a/ui/dbus-display1.xml
+++ b/ui/dbus-display1.xml
@@ -100,6 +100,23 @@
       <arg name="height" type="u" direction="in"/>
     </method>
 
+    <!--
+        QemuUIInfoTypes:
+
+        A D-Bus dictionary which maps the names of QemuUIInfo members to D-Bus type signatures.
+    -->
+    <property name="QemuUIInfoTypes" type="a{sg}" access="read"/>
+
+    <!--
+        SetUIInfo2:
+        @ui_info: the new QemuUIInfo.
+
+        Modify the display settings.
+    -->
+    <method name="SetUIInfo2">
+      <arg name="ui_info" type="a{sv}" direction="in"/>
+    </method>
+
     <!--
         Label:
 
-- 
2.55.0