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dix: lookup function for WindowPtr by XID

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This new lookup function retrieves a pointer to WindowRec structure by
associated XID. Unlike dixLookupWindow(), this one works globally, instead
of just on one specific client, and it doesn't do any XACE calls.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
This commit is contained in:
Enrico Weigelt, metux IT consult
2024-09-04 18:42:15 +02:00
parent 1784d25e95
commit 7b3671cd14
2 changed files with 43 additions and 0 deletions
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11
dix/dix_priv.h
View File

@@ -807,4 +807,15 @@ static inline void SwapLongs(CARD32 *list, unsigned long count) {
#define SwapRestL(stuff) \
SwapLongs((CARD32 *)(stuff + 1), (client->req_len - (sizeof(*stuff) >> 2)))
/*
* @brief lookup window by XID
*
* This globally looks for Window with given XID (all screens, all clients)
* and returns a pointer to it. If not found, returns NULL.
*
* Unlike ::dixLookupWindow() it doesn't scan only one given client, nor does
* it do any XACE calls.
*/
WindowPtr dixLookupWindowByXID(Window window);
#endif /* _XSERVER_DIX_PRIV_H */

32
dix/lookup.c
View File

@@ -39,3 +39,35 @@ ClientPtr dixClientForOtherClients(OtherClientsPtr pOtherClients) {
return dixClientForXID(pOtherClients->resource);
}
struct window_xid_match {
WindowPtr pWin;
Window id;
};
static int dix_match_window_xid(WindowPtr pWin, void *ptr)
{
struct window_xid_match *walk = (struct window_xid_match*) ptr;
if (walk->id == pWin->drawable.id) {
walk->pWin = pWin;
return WT_STOPWALKING;
}
else
return WT_WALKCHILDREN;
}
WindowPtr dixLookupWindowByXID(Window window)
{
struct window_xid_match walk = {
.id = window,
};
for (int i = 0; i < screenInfo.numScreens; i++) {
WalkTree(screenInfo.screens[i], dix_match_window_xid, &walk);
if (walk.pWin)
break;
}
return walk.pWin;
}