[mutter] remote-desktop: Add touch screen event support

[Jonas Ådahl <jadahl src gnome org>]

commit 03a12f9458c818ed06a65e4640818407be4e9141
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Jan 29 14:44:03 2018 +0800

    remote-desktop: Add touch screen event support

 src/backends/meta-remote-desktop-session.c | 135 +++++++++++++++++++++++++++++
 src/org.gnome.Mutter.RemoteDesktop.xml     |  33 +++++++
 2 files changed, 168 insertions(+)
---
diff --git a/src/backends/meta-remote-desktop-session.c b/src/backends/meta-remote-desktop-session.c
index 9270c0e5d..821b16724 100644
--- a/src/backends/meta-remote-desktop-session.c
+++ b/src/backends/meta-remote-desktop-session.c
@@ -58,6 +58,7 @@ struct _MetaRemoteDesktopSession
 
   ClutterVirtualInputDevice *virtual_pointer;
   ClutterVirtualInputDevice *virtual_keyboard;
+  ClutterVirtualInputDevice *virtual_touchscreen;
 };
 
 static void
@@ -102,6 +103,10 @@ meta_remote_desktop_session_start (MetaRemoteDesktopSession *session,
     clutter_device_manager_create_virtual_device (device_manager,
                                                   CLUTTER_KEYBOARD_DEVICE);
 
+  session->virtual_touchscreen =
+    clutter_device_manager_create_virtual_device (device_manager,
+                                                  CLUTTER_TOUCHSCREEN_DEVICE);
+
   return TRUE;
 }
 
@@ -561,6 +566,133 @@ handle_notify_pointer_motion_absolute (MetaDBusRemoteDesktopSession *skeleton,
   return TRUE;
 }
 
+static gboolean
+handle_notify_touch_down (MetaDBusRemoteDesktopSession *skeleton,
+                          GDBusMethodInvocation        *invocation,
+                          const char                   *stream_path,
+                          unsigned int                  slot,
+                          double                        x,
+                          double                        y)
+{
+  MetaRemoteDesktopSession *session = META_REMOTE_DESKTOP_SESSION (skeleton);
+  MetaScreenCastStream *stream;
+  double abs_x, abs_y;
+
+  if (!check_permission (session, invocation))
+    {
+      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                             G_DBUS_ERROR_ACCESS_DENIED,
+                                             "Permission denied");
+      return TRUE;
+    }
+
+  if (!session->screen_cast_session)
+    {
+      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                             G_DBUS_ERROR_FAILED,
+                                             "No screen cast active");
+      return TRUE;
+    }
+
+  stream = meta_screen_cast_session_get_stream (session->screen_cast_session,
+                                                stream_path);
+  if (!stream)
+    {
+      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                             G_DBUS_ERROR_FAILED,
+                                             "Unknown stream");
+      return TRUE;
+    }
+
+  meta_screen_cast_stream_transform_position (stream, x, y, &abs_x, &abs_y);
+
+  clutter_virtual_input_device_notify_touch_down (session->virtual_touchscreen,
+                                                  CLUTTER_CURRENT_TIME,
+                                                  slot,
+                                                  abs_x, abs_y);
+
+  meta_dbus_remote_desktop_session_complete_notify_touch_down (skeleton,
+                                                               invocation);
+
+  return TRUE;
+}
+
+static gboolean
+handle_notify_touch_motion (MetaDBusRemoteDesktopSession *skeleton,
+                            GDBusMethodInvocation        *invocation,
+                            const char                   *stream_path,
+                            unsigned int                  slot,
+                            double                        x,
+                            double                        y)
+{
+  MetaRemoteDesktopSession *session = META_REMOTE_DESKTOP_SESSION (skeleton);
+  MetaScreenCastStream *stream;
+  double abs_x, abs_y;
+
+  if (!check_permission (session, invocation))
+    {
+      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                             G_DBUS_ERROR_ACCESS_DENIED,
+                                             "Permission denied");
+      return TRUE;
+    }
+
+  if (!session->screen_cast_session)
+    {
+      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                             G_DBUS_ERROR_FAILED,
+                                             "No screen cast active");
+      return TRUE;
+    }
+
+  stream = meta_screen_cast_session_get_stream (session->screen_cast_session,
+                                                stream_path);
+  if (!stream)
+    {
+      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                             G_DBUS_ERROR_FAILED,
+                                             "Unknown stream");
+      return TRUE;
+    }
+
+  meta_screen_cast_stream_transform_position (stream, x, y, &abs_x, &abs_y);
+
+  clutter_virtual_input_device_notify_touch_motion (session->virtual_touchscreen,
+                                                    CLUTTER_CURRENT_TIME,
+                                                    slot,
+                                                    abs_x, abs_y);
+
+  meta_dbus_remote_desktop_session_complete_notify_touch_motion (skeleton,
+                                                                 invocation);
+
+  return TRUE;
+}
+
+static gboolean
+handle_notify_touch_up (MetaDBusRemoteDesktopSession *skeleton,
+                          GDBusMethodInvocation        *invocation,
+                          unsigned int                  slot)
+{
+  MetaRemoteDesktopSession *session = META_REMOTE_DESKTOP_SESSION (skeleton);
+
+  if (!check_permission (session, invocation))
+    {
+      g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                             G_DBUS_ERROR_ACCESS_DENIED,
+                                             "Permission denied");
+      return TRUE;
+    }
+
+  clutter_virtual_input_device_notify_touch_up (session->virtual_touchscreen,
+                                                       CLUTTER_CURRENT_TIME,
+                                                       slot);
+
+  meta_dbus_remote_desktop_session_complete_notify_touch_up (skeleton,
+                                                             invocation);
+
+  return TRUE;
+}
+
 static void
 meta_remote_desktop_session_init_iface (MetaDBusRemoteDesktopSessionIface *iface)
 {
@@ -573,6 +705,9 @@ meta_remote_desktop_session_init_iface (MetaDBusRemoteDesktopSessionIface *iface
   iface->handle_notify_pointer_axis_discrete = handle_notify_pointer_axis_discrete;
   iface->handle_notify_pointer_motion_relative = handle_notify_pointer_motion_relative;
   iface->handle_notify_pointer_motion_absolute = handle_notify_pointer_motion_absolute;
+  iface->handle_notify_touch_down = handle_notify_touch_down;
+  iface->handle_notify_touch_motion = handle_notify_touch_motion;
+  iface->handle_notify_touch_up = handle_notify_touch_up;
 }
 
 static void
diff --git a/src/org.gnome.Mutter.RemoteDesktop.xml b/src/org.gnome.Mutter.RemoteDesktop.xml
index 4646d2948..dddc59a16 100644
--- a/src/org.gnome.Mutter.RemoteDesktop.xml
+++ b/src/org.gnome.Mutter.RemoteDesktop.xml
@@ -131,6 +131,39 @@
       <arg name="y" type="d" direction="in" />
     </method>
 
+    <!--
+       NotifyTouchDown:
+
+       A absolute pointer motion event notification
+     -->
+    <method name="NotifyTouchDown">
+      <arg name="stream" type="s" direction="in" />
+      <arg name="slot" type="u" direction="in" />
+      <arg name="x" type="d" direction="in" />
+      <arg name="y" type="d" direction="in" />
+    </method>
+
+    <!--
+       NotifyTouchMotion:
+
+       A absolute pointer motion event notification
+     -->
+    <method name="NotifyTouchMotion">
+      <arg name="stream" type="s" direction="in" />
+      <arg name="slot" type="u" direction="in" />
+      <arg name="x" type="d" direction="in" />
+      <arg name="y" type="d" direction="in" />
+    </method>
+
+    <!--
+       NotifyTouchUp:
+
+       A absolute pointer motion event notification
+     -->
+    <method name="NotifyTouchUp">
+      <arg name="slot" type="u" direction="in" />
+    </method>
+
   </interface>
 
 </node>