Xi: add the hooks for passive touch grabs

Co-authored-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Chase Douglas <chase.douglas@canonical.com>

Xi/exevents.c

@@ -2253,12 +2253,14 @@ CheckGrabValues(ClientPtr client, GrabParameters* param)
     }
 
     if ((param->this_device_mode != GrabModeSync) &&
-	(param->this_device_mode != GrabModeAsync)) {
+	(param->this_device_mode != GrabModeAsync) &&
+        (param->this_device_mode != XIGrabModeTouch)) {
 	client->errorValue = param->this_device_mode;
 	return BadValue;
     }
     if ((param->other_devices_mode != GrabModeSync) &&
-	(param->other_devices_mode != GrabModeAsync)) {
+	(param->other_devices_mode != GrabModeAsync) &&
+        (param->other_devices_mode != XIGrabModeTouch)) {
 	client->errorValue = param->other_devices_mode;
 	return BadValue;
     }
@@ -2423,6 +2425,34 @@ GrabWindow(ClientPtr client, DeviceIntPtr dev, int type,
     return AddPassiveGrabToList(client, grab);
 }
 
+/* Touch grab */
+int
+GrabTouch(ClientPtr client, DeviceIntPtr dev, DeviceIntPtr mod_dev,
+          GrabParameters *param, GrabMask *mask)
+{
+    WindowPtr pWin;
+    GrabPtr grab;
+    int rc;
+
+    rc = CheckGrabValues(client, param);
+    if (rc != Success)
+        return rc;
+
+    rc = dixLookupWindow(&pWin, param->grabWindow, client, DixSetAttrAccess);
+    if (rc != Success)
+       return rc;
+    rc = XaceHook(XACE_DEVICE_ACCESS, client, dev, DixGrabAccess);
+    if (rc != Success)
+       return rc;
+
+    grab = CreateGrab(client->index, dev, mod_dev, pWin, XI2,
+                      mask, param, XI_TouchBegin, 0, NullWindow, NullCursor);
+    if (!grab)
+        return BadAlloc;
+
+    return AddPassiveGrabToList(client, grab);
+}
+
 int
 SelectForWindow(DeviceIntPtr dev, WindowPtr pWin, ClientPtr client,
 		Mask mask, Mask exclusivemasks)

Xi/xipassivegrab.c

@@ -108,19 +108,29 @@ ProcXIPassiveGrabDevice(ClientPtr client)
     if (stuff->grab_type != XIGrabtypeButton &&
         stuff->grab_type != XIGrabtypeKeycode &&
         stuff->grab_type != XIGrabtypeEnter &&
-        stuff->grab_type != XIGrabtypeFocusIn)
+        stuff->grab_type != XIGrabtypeFocusIn &&
+        stuff->grab_type != XIGrabtypeTouchBegin)
     {
         client->errorValue = stuff->grab_type;
         return BadValue;
     }
 
     if ((stuff->grab_type == XIGrabtypeEnter ||
-         stuff->grab_type == XIGrabtypeFocusIn) && stuff->detail != 0)
+         stuff->grab_type == XIGrabtypeFocusIn ||
+         stuff->grab_type == XIGrabtypeTouchBegin) && stuff->detail != 0)
     {
         client->errorValue = stuff->detail;
         return BadValue;
     }
 
+    if (stuff->grab_type == XIGrabtypeTouchBegin &&
+        (stuff->grab_mode != XIGrabModeTouch ||
+         stuff->paired_device_mode != GrabModeAsync))
+    {
+        client->errorValue = stuff->grab_mode;
+        return BadValue;
+    }
+
     if (XICheckInvalidMaskBits(client, (unsigned char*)&stuff[1],
                                stuff->mask_len * 4) != Success)
         return BadValue;
@@ -194,6 +204,9 @@ ProcXIPassiveGrabDevice(ClientPtr client)
                 status = GrabWindow(client, dev, stuff->grab_type,
                                     &param, &mask);
                 break;
+            case XIGrabtypeTouchBegin:
+                status = GrabTouch(client, dev, mod_dev, &param, &mask);
+                break;
         }
 
         if (status != GrabSuccess)

include/exevents.h

@@ -221,6 +221,14 @@ GrabWindow(
 	GrabParameters*        /* param */,
 	GrabMask*              /* eventMask */);
 
+extern int
+GrabTouch(
+       ClientPtr              /* client */,
+       DeviceIntPtr           /* dev */,
+       DeviceIntPtr           /* mod_dev */,
+       GrabParameters*        /* param */,
+       GrabMask*              /* eventMask */);
+
 extern int
 SelectForWindow(
 	DeviceIntPtr           /* dev */,