[mutter/wip/carlosg/tap-on-opaque-tablets] backends: Always enable tap-to-click/drag on opaque Wacom tablets

[Carlos Garnacho <carlosg src gnome org>]

commit 6913d41a951d2c2df22103cebc5a93017bdd1482
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Dec 12 18:05:08 2019 +0100

    backends: Always enable tap-to-click/drag on opaque Wacom tablets
    
    Touch-wise, those are essentially giant touchpads, but have no buttons
    associated to the "touchpad" device (There may be pad buttons, but
    those are not mouse buttons).
    
    Without tap-to-click/drag, touch in those devices is somewhat useless
    out of the box. Have them always enable these features, despite the
    setting.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/968

 src/backends/meta-input-settings.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/meta-input-settings.c b/src/backends/meta-input-settings.c
index 2e6672d9c..77d392944 100644
--- a/src/backends/meta-input-settings.c
+++ b/src/backends/meta-input-settings.c
@@ -517,6 +517,33 @@ update_touchpad_disable_while_typing (MetaInputSettings  *input_settings,
     }
 }
 
+static gboolean
+device_is_tablet_touchpad (MetaInputSettings *input_settings,
+                           ClutterInputDevice *device)
+{
+#ifdef HAVE_LIBWACOM
+  WacomIntegrationFlags flags = 0;
+  WacomDevice *wacom_device;
+
+  if (clutter_input_device_get_device_type (device) != CLUTTER_TOUCHPAD_DEVICE)
+    return FALSE;
+
+  wacom_device =
+    meta_input_settings_get_tablet_wacom_device (input_settings,
+                                                 device);
+  if (wacom_device)
+    {
+      flags = libwacom_get_integration_flags (wacom_device);
+
+      if ((flags & (WACOM_DEVICE_INTEGRATED_SYSTEM |
+                    WACOM_DEVICE_INTEGRATED_DISPLAY)) == 0)
+        return TRUE;
+    }
+#endif
+
+  return FALSE;
+}
+
 static void
 update_touchpad_tap_enabled (MetaInputSettings  *input_settings,
                              ClutterInputDevice *device)
@@ -531,7 +558,8 @@ update_touchpad_tap_enabled (MetaInputSettings  *input_settings,
 
   priv = meta_input_settings_get_instance_private (input_settings);
   input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
-  enabled = g_settings_get_boolean (priv->touchpad_settings, "tap-to-click");
+  enabled = device_is_tablet_touchpad (input_settings, device) ||
+    g_settings_get_boolean (priv->touchpad_settings, "tap-to-click");
 
   if (device)
     {
@@ -561,7 +589,8 @@ update_touchpad_tap_and_drag_enabled (MetaInputSettings  *input_settings,
 
   priv = meta_input_settings_get_instance_private (input_settings);
   input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
-  enabled = g_settings_get_boolean (priv->touchpad_settings, "tap-and-drag");
+  enabled = device_is_tablet_touchpad (input_settings, device) ||
+    g_settings_get_boolean (priv->touchpad_settings, "tap-and-drag");
 
   if (device)
     {