[PATCH v2 3/12] Xi: Add support for confine_to on XI 2.1 XIPassiveGrab requests.

[Peter Hutterer]

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
Changes to v1:
- use get_confine_to instead of in-place byte offset calculation

 Xi/xigrabdev.c     |    2 +-
 Xi/xigrabdev.h     |    2 ++
 Xi/xipassivegrab.c |   40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletions(-)

diff --git a/Xi/xigrabdev.c b/Xi/xigrabdev.c
index ca72026..b504630 100644
--- a/Xi/xigrabdev.c
+++ b/Xi/xigrabdev.c
@@ -58,7 +58,7 @@ get_confine_to(xXIGrabDeviceReq *req)
     return (Window*)data;
 }
 
-static Bool
+Bool
 HasConfineTo(ClientPtr client)
 {
     XIClientPtr pXIClient;
diff --git a/Xi/xigrabdev.h b/Xi/xigrabdev.h
index 08309c9..2f74788 100644
--- a/Xi/xigrabdev.h
+++ b/Xi/xigrabdev.h
@@ -38,4 +38,6 @@ int SProcXIUngrabDevice(ClientPtr client);
 
 void SRepXIGrabDevice(ClientPtr client, int size, xXIGrabDeviceReply * rep);
 
+Bool HasConfineTo(ClientPtr client);
+
 #endif /* XIGRABDEV_H */
diff --git a/Xi/xipassivegrab.c b/Xi/xipassivegrab.c
index ae43433..caffc66 100644
--- a/Xi/xipassivegrab.c
+++ b/Xi/xipassivegrab.c
@@ -45,6 +45,23 @@
 #include "dixgrabs.h"
 #include "misc.h"
 
+#include "xigrabdev.h" /* HasConfineTo */
+
+/**
+ * The confine_to window in XI2.1 trails the request. It is the first 4
+ * bytes after the fixed request + the mask bytes + modifier bytes.
+ * Mask and modifiers are both in 4-byte units.
+ *
+ * @return A pointer to the 4 bytes that represent the confine_to on the
+ * wire.
+ */
+static Window*
+get_confine_to(const xXIPassiveGrabDeviceReq *req)
+{
+    char *data = (char*)&req[1] + req->mask_len * 4 + req->num_modifiers * 4;
+    return  (Window*)data;
+}
+
 int
 SProcXIPassiveGrabDevice(ClientPtr client)
 {
@@ -60,6 +77,10 @@ SProcXIPassiveGrabDevice(ClientPtr client)
     swapl(&stuff->cursor, n);
     swapl(&stuff->time, n);
     swapl(&stuff->detail, n);
+
+    if(HasConfineTo(client) == TRUE)
+        swapl(get_confine_to(stuff), n);
+
     swaps(&stuff->mask_len, n);
     swaps(&stuff->num_modifiers, n);
 
@@ -89,6 +110,7 @@ ProcXIPassiveGrabDevice(ClientPtr client)
     void *tmp;
     int mask_len;
     int n;
+    Window confine_to;
 
     REQUEST(xXIPassiveGrabDeviceReq);
     REQUEST_AT_LEAST_SIZE(xXIPassiveGrabDeviceReq);
@@ -160,6 +182,24 @@ ProcXIPassiveGrabDevice(ClientPtr client)
     if (status != Success)
 	return status;
 
+    /* If the client has version 2_1 or higher, it will send the confine_to window
+     * at the end of the request */
+    confine_to = None;
+
+    if(HasConfineTo(client) == TRUE) {
+        Window *wire_confine_to = get_confine_to(stuff);
+        confine_to = *wire_confine_to;
+    }
+
+    if (confine_to != None)
+    {
+        status = dixLookupWindow((WindowPtr*)&tmp, confine_to, client, DixSetAttrAccess);
+        if (status != Success)
+            return status;
+    }
+
+    param.confineTo = confine_to;
+
     status = CheckGrabValues(client, &param);
     if (status != Success)
         return status;
-- 
1.7.5.1