ui/dbus: Expose a touch device interface

So that clients making use of the DBus backend could
send touch events through the new org.qemu.Display1.Touch
interface

Signed-off-by: Bilal Elmoussaoui <belmouss@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230619095337.9899-3-belmouss@redhat.com>

ui/dbus-console.c

@@ -32,6 +32,8 @@
 
 #include "dbus.h"
 
+static struct touch_slot touch_slots[INPUT_EVENT_SLOTS_MAX];
+
 struct _DBusDisplayConsole {
     GDBusObjectSkeleton parent_instance;
     DisplayChangeListener dcl;
@@ -44,6 +46,7 @@ struct _DBusDisplayConsole {
     QKbdState *kbd;
 
     QemuDBusDisplay1Mouse *iface_mouse;
+    QemuDBusDisplay1MultiTouch *iface_touch;
     gboolean last_set;
     guint last_x;
     guint last_y;
@@ -345,6 +348,46 @@ dbus_mouse_rel_motion(DBusDisplayConsole *ddc,
     return DBUS_METHOD_INVOCATION_HANDLED;
 }
 
+static gboolean
+dbus_touch_send_event(DBusDisplayConsole *ddc,
+                      GDBusMethodInvocation *invocation,
+                      guint kind, uint64_t num_slot,
+                      double x, double y)
+{
+    Error *error = NULL;
+    int width, height;
+    trace_dbus_touch_send_event(kind, num_slot, x, y);
+
+    if (kind != INPUT_MULTI_TOUCH_TYPE_BEGIN &&
+        kind != INPUT_MULTI_TOUCH_TYPE_UPDATE &&
+        kind != INPUT_MULTI_TOUCH_TYPE_CANCEL &&
+        kind != INPUT_MULTI_TOUCH_TYPE_END)
+    {
+        g_dbus_method_invocation_return_error(
+            invocation, DBUS_DISPLAY_ERROR,
+            DBUS_DISPLAY_ERROR_INVALID,
+            "Invalid touch event kind");
+        return DBUS_METHOD_INVOCATION_HANDLED;
+    }
+    width = qemu_console_get_width(ddc->dcl.con, 0);
+    height = qemu_console_get_height(ddc->dcl.con, 0);
+
+    console_handle_touch_event(ddc->dcl.con, touch_slots,
+                               num_slot, width, height,
+                               x, y, kind, &error);
+    if (error != NULL) {
+        g_dbus_method_invocation_return_error(
+            invocation, DBUS_DISPLAY_ERROR,
+            DBUS_DISPLAY_ERROR_INVALID,
+            error_get_pretty(error), NULL);
+        error_free(error);
+    } else {
+        qemu_dbus_display1_multi_touch_complete_send_event(ddc->iface_touch,
+                                                           invocation);
+    }
+    return DBUS_METHOD_INVOCATION_HANDLED;
+}
+
 static gboolean
 dbus_mouse_set_pos(DBusDisplayConsole *ddc,
                    GDBusMethodInvocation *invocation,
@@ -440,7 +483,7 @@ dbus_display_console_new(DBusDisplay *display, QemuConsole *con)
     g_autofree char *label = NULL;
     char device_addr[256] = "";
     DBusDisplayConsole *ddc;
-    int idx;
+    int idx, i;
 
     assert(display);
     assert(con);
@@ -495,6 +538,20 @@ dbus_display_console_new(DBusDisplay *display, QemuConsole *con)
     g_dbus_object_skeleton_add_interface(G_DBUS_OBJECT_SKELETON(ddc),
         G_DBUS_INTERFACE_SKELETON(ddc->iface_mouse));
 
+    ddc->iface_touch = qemu_dbus_display1_multi_touch_skeleton_new();
+    g_object_connect(ddc->iface_touch,
+        "swapped-signal::handle-send-event", dbus_touch_send_event, ddc,
+        NULL);
+    qemu_dbus_display1_multi_touch_set_max_slots(ddc->iface_touch,
+                                                 INPUT_EVENT_SLOTS_MAX);
+    g_dbus_object_skeleton_add_interface(G_DBUS_OBJECT_SKELETON(ddc),
+        G_DBUS_INTERFACE_SKELETON(ddc->iface_touch));
+
+    for (i = 0; i < INPUT_EVENT_SLOTS_MAX; i++) {
+        struct touch_slot *slot = &touch_slots[i];
+        slot->tracking_id = -1;
+    }
+
     register_displaychangelistener(&ddc->dcl);
     ddc->mouse_mode_notifier.notify = dbus_mouse_mode_change;
     qemu_add_mouse_mode_change_notifier(&ddc->mouse_mode_notifier);

ui/dbus-display1.xml

@@ -39,8 +39,9 @@
       "Text" (see :dbus:prop:`Type` and other properties).
 
       Interactions with a console may be done with
-      :dbus:iface:`org.qemu.Display1.Keyboard` and
+      :dbus:iface:`org.qemu.Display1.Keyboard`,
-      :dbus:iface:`org.qemu.Display1.Mouse` interfaces when available.
+      :dbus:iface:`org.qemu.Display1.Mouse` and
+      :dbus:iface:`org.qemu.Display1.MultiTouch` interfaces when available.
   -->
   <interface name="org.qemu.Display1.Console">
     <!--
@@ -236,6 +237,46 @@
     <property name="IsAbsolute" type="b" access="read"/>
   </interface>
 
+  <!--
+      org.qemu.Display1.MultiTouch:
+
+      This interface in implemented on ``/org/qemu/Display1/Console_$id`` (see
+      :dbus:iface:`~org.qemu.Display1.Console` documentation).
+
+      .. _dbus-kind-values:
+
+      **Kind values**::
+
+        Begin       = 0
+        Update      = 1
+        End         = 2
+        Cancel      = 3
+  -->
+  <interface name="org.qemu.Display1.MultiTouch">
+    <!--
+        SendEvent:
+        @kind: The touch event kind
+        @num_slot: The slot number.
+        @x: The x coordinates.
+        @y: The y coordinates.
+
+        Send a touch gesture event.
+    -->
+    <method name="SendEvent">
+      <arg type="u" name="kind" direction="in"/>
+      <arg type="t" name="num_slot" direction="in"/>
+      <arg type="d" name="x" direction="in"/>
+      <arg type="d" name="y" direction="in"/>
+    </method>
+
+    <!--
+        MaxSlots:
+
+        The maximum number of slots.
+    -->
+    <property name="MaxSlots" type="i" access="read"/>
+  </interface>
+
   <!--
       org.qemu.Display1.Listener:
 

ui/trace-events

@@ -154,6 +154,7 @@ dbus_mouse_press(unsigned int button) "button %u"
 dbus_mouse_release(unsigned int button) "button %u"
 dbus_mouse_set_pos(unsigned int x, unsigned int y) "x=%u, y=%u"
 dbus_mouse_rel_motion(int dx, int dy) "dx=%d, dy=%d"
+dbus_touch_send_event(unsigned int kind, uint32_t num_slot, uint32_t x, uint32_t y) "kind=%u, num_slot=%u, x=%d, y=%d"
 dbus_update(int x, int y, int w, int h) "x=%d, y=%d, w=%d, h=%d"
 dbus_clipboard_grab_failed(void) ""
 dbus_clipboard_register(const char *bus_name) "peer %s"