Report touch emulated buttons in XIQueryPointer for XI 2.1 and earlier

XInput 2.1 and earlier clients do not know about touches. We must report
touch emulated button presses for these clients. For later clients, we
only report true pointer button presses.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit ee542b85590814ee25369babce1ad14feeb137af)

1 files changed, 14 insertions, 0 deletions

diff --git a/Xi/xiquerypointer.c b/Xi/xiquerypointer.c
index ba99752ef..169436e14 100644
--- a/Xi/xiquerypointer.c
+++ b/Xi/xiquerypointer.c
@@ -79,10 +79,21 @@ ProcXIQueryPointer(ClientPtr client)
     XkbStatePtr state;
     char *buttons = NULL;
     int buttons_size = 0;       /* size of buttons array */
+    XIClientPtr xi_client;
+    Bool have_xi22 = FALSE;
 
     REQUEST(xXIQueryPointerReq);
     REQUEST_SIZE_MATCH(xXIQueryPointerReq);
 
+    /* Check if client is compliant with XInput 2.2 or later. Earlier clients
+     * do not know about touches, so we must report emulated button presses. 2.2
+     * and later clients are aware of touches, so we don't include emulated
+     * button presses in the reply. */
+    xi_client = dixLookupPrivate(&client->devPrivates, XIClientPrivateKey);
+    if (version_compare(xi_client->major_version,
+                        xi_client->minor_version, 2, 2) >= 0)
+        have_xi22 = TRUE;
+
     rc = dixLookupDevice(&pDev, stuff->deviceid, client, DixReadAccess);
     if (rc != Success) {
         client->errorValue = stuff->deviceid;
@@ -145,6 +156,9 @@ ProcXIQueryPointer(ClientPtr client)
         for (i = 1; i < pDev->button->numButtons; i++)
             if (BitIsOn(pDev->button->down, i))
                 SetBit(buttons, pDev->button->map[i]);
+
+        if (!have_xi22 && pDev->touch && pDev->touch->buttonsDown > 0)
+            SetBit(buttons, pDev->button->map[1]);
     }
     else
         rep.buttons_len = 0;