[gtk+/multitouch: 95/124] gdk, xi2: Only enable multitouch if the server reports XI2.2

[Carlos Garnacho <carlosg src gnome org>]

commit af0a00cf626fe5af154f730467aa8fbd32df7614
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat Dec 24 14:36:57 2011 +0100

    gdk,xi2: Only enable multitouch if the server reports XI2.2
    
    This enables multitouch-enabled GTK+ to run on older X servers.

 gdk/x11/gdkdevice-xi2.c        |   27 ++++++++++++++++++++++-----
 gdk/x11/gdkdevicemanager-xi2.c |    4 +++-
 gdk/x11/gdkprivate-x11.h       |    5 +++--
 3 files changed, 28 insertions(+), 8 deletions(-)
---
diff --git a/gdk/x11/gdkdevice-xi2.c b/gdk/x11/gdkdevice-xi2.c
index f0e65b3..3b009e5 100644
--- a/gdk/x11/gdkdevice-xi2.c
+++ b/gdk/x11/gdkdevice-xi2.c
@@ -388,6 +388,7 @@ gdk_x11_device_xi2_grab (GdkDevice    *device,
                          guint32       time_)
 {
   GdkX11DeviceXI2 *device_xi2 = GDK_X11_DEVICE_XI2 (device);
+  GdkX11DeviceManagerXI2 *device_manager_xi2;
   GdkDisplay *display;
   XIEventMask mask;
   Window xwindow;
@@ -395,6 +396,7 @@ gdk_x11_device_xi2_grab (GdkDevice    *device,
   gint status;
 
   display = gdk_device_get_display (device);
+  device_manager_xi2 = GDK_X11_DEVICE_MANAGER_XI2 (gdk_display_get_device_manager (display));
 
   /* FIXME: confine_to is actually unused */
 
@@ -409,7 +411,9 @@ gdk_x11_device_xi2_grab (GdkDevice    *device,
     }
 
   mask.deviceid = device_xi2->device_id;
-  mask.mask = _gdk_x11_device_xi2_translate_event_mask (event_mask, &mask.mask_len);
+  mask.mask = _gdk_x11_device_xi2_translate_event_mask (device_manager_xi2,
+                                                        event_mask,
+                                                        &mask.mask_len);
 
 #ifdef G_ENABLE_DEBUG
   if (_gdk_debug_flags & GDK_DEBUG_NOGRABS)
@@ -625,10 +629,17 @@ gdk_x11_device_xi2_select_window_events (GdkDevice    *device,
                                          GdkEventMask  event_mask)
 {
   GdkX11DeviceXI2 *device_xi2 = GDK_X11_DEVICE_XI2 (device);
+  GdkX11DeviceManagerXI2 *device_manager_xi2;
+  GdkDisplay *display;
   XIEventMask evmask;
 
+  display = gdk_device_get_display (device);
+  device_manager_xi2 = GDK_X11_DEVICE_MANAGER_XI2 (gdk_display_get_device_manager (display));
+
   evmask.deviceid = device_xi2->device_id;
-  evmask.mask = _gdk_x11_device_xi2_translate_event_mask (event_mask, &evmask.mask_len);
+  evmask.mask = _gdk_x11_device_xi2_translate_event_mask (device_manager_xi2,
+                                                          event_mask,
+                                                          &evmask.mask_len);
 
   XISelectEvents (GDK_WINDOW_XDISPLAY (window),
                   GDK_WINDOW_XID (window),
@@ -638,10 +649,14 @@ gdk_x11_device_xi2_select_window_events (GdkDevice    *device,
 }
 
 guchar *
-_gdk_x11_device_xi2_translate_event_mask (GdkEventMask  event_mask,
-                                          gint         *len)
+_gdk_x11_device_xi2_translate_event_mask (GdkX11DeviceManagerXI2 *device_manager_xi2,
+                                          GdkEventMask            event_mask,
+                                          gint                   *len)
 {
   guchar *mask;
+  gint minor;
+
+  g_object_get (device_manager_xi2, "minor", &minor, NULL);
 
   *len = XIMaskLen (XI_LASTEVENT);
   mask = g_new0 (guchar, *len);
@@ -691,7 +706,9 @@ _gdk_x11_device_xi2_translate_event_mask (GdkEventMask  event_mask,
     }
 
 #ifdef XINPUT_2_2
-  if (event_mask & GDK_TOUCH_MASK)
+  /* XInput 2.2 includes multitouch support */
+  if (minor >= 2 &&
+      event_mask & GDK_TOUCH_MASK)
     {
       XISetMask (mask, XI_TouchBegin);
       XISetMask (mask, XI_TouchUpdate);
diff --git a/gdk/x11/gdkdevicemanager-xi2.c b/gdk/x11/gdkdevicemanager-xi2.c
index 05a35c8..63f9bf8 100644
--- a/gdk/x11/gdkdevicemanager-xi2.c
+++ b/gdk/x11/gdkdevicemanager-xi2.c
@@ -1384,7 +1384,9 @@ gdk_x11_device_manager_xi2_select_window_events (GdkEventTranslator *translator,
   device_manager = GDK_DEVICE_MANAGER (translator);
 
   event_mask.deviceid = XIAllMasterDevices;
-  event_mask.mask = _gdk_x11_device_xi2_translate_event_mask (evmask, &event_mask.mask_len);
+  event_mask.mask = _gdk_x11_device_xi2_translate_event_mask (GDK_X11_DEVICE_MANAGER_XI2 (device_manager),
+                                                              evmask,
+                                                              &event_mask.mask_len);
 
   _gdk_x11_device_manager_xi2_select_events (device_manager, window, &event_mask);
   g_free (event_mask.mask);
diff --git a/gdk/x11/gdkprivate-x11.h b/gdk/x11/gdkprivate-x11.h
index 7a65581..803dad7 100644
--- a/gdk/x11/gdkprivate-x11.h
+++ b/gdk/x11/gdkprivate-x11.h
@@ -247,8 +247,9 @@ void _gdk_x11_device_xi_translate_axes     (GdkDevice *device,
 #endif
 
 #ifdef XINPUT_2
-guchar * _gdk_x11_device_xi2_translate_event_mask (GdkEventMask     event_mask,
-                                                   gint            *len);
+guchar * _gdk_x11_device_xi2_translate_event_mask (GdkX11DeviceManagerXI2 *device_manager_xi2,
+                                                   GdkEventMask            event_mask,
+                                                   gint                   *len);
 guint    _gdk_x11_device_xi2_translate_state      (XIModifierState *mods_state,
                                                    XIButtonState   *buttons_state,
                                                    XIGroupState    *group_state);