x11: Store last axes from device

And use these for the missing axes if the valuator mask is incomplete.
This used to work fine on tablets because the Wacom driver ensures all
valuators are sent, which is not true if using the evdev driver.

https://bugzilla.gnome.org/show_bug.cgi?id=703610

1 files changed, 6 insertions, 0 deletions

diff --git a/gdk/x11/gdkprivate-x11.h b/gdk/x11/gdkprivate-x11.h
index d5f3e1d74f..c2afecf46d 100644
--- a/gdk/x11/gdkprivate-x11.h
+++ b/gdk/x11/gdkprivate-x11.h
@@ -247,6 +247,12 @@ gboolean  _gdk_x11_device_xi2_get_scroll_delta    (GdkX11DeviceXI2    *device,
                                                    gdouble            *delta_ret);
 void     _gdk_device_xi2_reset_scroll_valuators   (GdkX11DeviceXI2    *device);
 
+gdouble  gdk_x11_device_xi2_get_last_axis_value (GdkX11DeviceXI2 *device,
+                                                 gint             n_axis);
+
+void     gdk_x11_device_xi2_store_axes          (GdkX11DeviceXI2 *device,
+                                                 gdouble         *axes,
+                                                 gint             n_axes);
 #endif
 
 void     _gdk_x11_event_translate_keyboard_string (GdkEventKey *event);