static
PREGION FASTCALL
DceGetVisRgn(PWND Window, ULONG Flags, HWND hWndChild, ULONG CFlags)
{
PREGION Rgn;
Rgn = VIS_ComputeVisibleRegion( Window,
0 == (Flags & DCX_WINDOW),
0 != (Flags & DCX_CLIPCHILDREN),
0 != (Flags & DCX_CLIPSIBLINGS));
/* Caller expects a non-null region */
if (!Rgn)
Rgn = IntSysCreateRectpRgn(0, 0, 0, 0);
return Rgn;
}
/*
* Fills the CLIPOBJ and client rect of the WNDOBJ with the data from the given WND
*/
BOOLEAN
FASTCALL
IntEngWndUpdateClipObj(
WNDGDI *WndObjInt,
PWND Window)
{
HRGN hVisRgn;
PROSRGNDATA visRgn;
CLIPOBJ *ClipObj = NULL;
CLIPOBJ *OldClipObj;
DPRINT("IntEngWndUpdateClipObj\n");
hVisRgn = VIS_ComputeVisibleRegion(Window, TRUE, TRUE, TRUE);
if (hVisRgn != NULL)
{
NtGdiOffsetRgn(hVisRgn, Window->rcClient.left, Window->rcClient.top);
visRgn = RGNOBJAPI_Lock(hVisRgn, NULL);
if (visRgn != NULL)
{
if (visRgn->rdh.nCount > 0)
{
ClipObj = IntEngCreateClipRegion(visRgn->rdh.nCount, visRgn->Buffer,
&visRgn->rdh.rcBound);
DPRINT("Created visible region with %lu rects\n", visRgn->rdh.nCount);
DPRINT(" BoundingRect: %d, %d %d, %d\n",
visRgn->rdh.rcBound.left, visRgn->rdh.rcBound.top,
visRgn->rdh.rcBound.right, visRgn->rdh.rcBound.bottom);
{
ULONG i;
for (i = 0; i < visRgn->rdh.nCount; i++)
{
DPRINT(" Rect #%lu: %ld,%ld %ld,%ld\n", i+1,
visRgn->Buffer[i].left, visRgn->Buffer[i].top,
visRgn->Buffer[i].right, visRgn->Buffer[i].bottom);
}
}
}
RGNOBJAPI_Unlock(visRgn);
}
else
{
DPRINT1("Warning: Couldn't lock visible region of window DC\n");
}
GreDeleteObject(hVisRgn);
}
else
{
DPRINT1("Warning: VIS_ComputeVisibleRegion failed!\n");
}
if (ClipObj == NULL)
{
/* Fall back to client rect */
ClipObj = IntEngCreateClipRegion(1, &Window->rcClient,
&Window->rcClient);
}
if (ClipObj == NULL)
{
DPRINT1("Warning: IntEngCreateClipRegion() failed!\n");
return FALSE;
}
RtlCopyMemory(&WndObjInt->WndObj.coClient, ClipObj, sizeof (CLIPOBJ));
RtlCopyMemory(&WndObjInt->WndObj.rclClient, &Window->rcClient, sizeof (RECT));
OldClipObj = InterlockedExchangePointer((PVOID*)&WndObjInt->ClientClipObj, ClipObj);
if (OldClipObj != NULL)
IntEngDeleteClipRegion(OldClipObj);
return TRUE;
}