mirror of
https://github.com/reactos/reactos.git
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150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS WIN32 subsystem
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* PURPOSE: Support functions for GDI client objects
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* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
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*/
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#include <precomp.h>
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CRITICAL_SECTION gcsClientObjLinks;
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typedef struct _CLIENTOBJLINK
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{
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struct _CLIENTOBJLINK *pcolNext;
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HGDIOBJ hobj;
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PVOID pvObj;
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} CLIENTOBJLINK, *PCLIENTOBJLINK;
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PCLIENTOBJLINK gapcolHashTable[127];
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HGDIOBJ
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WINAPI
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GdiInsertClientObj(
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_In_ PVOID pvObject,
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_In_ GDILOOBJTYPE eObjType)
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{
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PCLIENTOBJLINK pcol;
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ULONG iHashIndex;
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HGDIOBJ hobj;
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/* Call win32k to create a client object handle */
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hobj = NtGdiCreateClientObj(eObjType);
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if (hobj == NULL)
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{
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return NULL;
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}
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/* Calculate the hash index */
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iHashIndex = (ULONG_PTR)hobj % _countof(gapcolHashTable);
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/* Allocate a link structure */
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pcol = HeapAlloc(GetProcessHeap(), 0, sizeof(*pcol));
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if (pcol == NULL)
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{
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NtGdiDeleteClientObj(hobj);
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return NULL;
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}
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/* Setup the link structure */
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pcol->hobj = hobj;
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pcol->pvObj = pvObject;
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/* Enter the critical section */
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EnterCriticalSection(&gcsClientObjLinks);
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/* Insert the link structure */
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pcol->pcolNext = gapcolHashTable[iHashIndex];
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gapcolHashTable[iHashIndex] = pcol;
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/* Leave the critical section */
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LeaveCriticalSection(&gcsClientObjLinks);
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return hobj;
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}
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PVOID
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WINAPI
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GdiGetClientObject(
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_In_ HGDIOBJ hobj)
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{
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ULONG iHashIndex;
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PCLIENTOBJLINK pcol;
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PVOID pvObject = NULL;
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/* Calculate the hash index */
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iHashIndex = (ULONG_PTR)hobj % _countof(gapcolHashTable);
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/* Enter the critical section */
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EnterCriticalSection(&gcsClientObjLinks);
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/* Loop the link entries in this hash bucket */
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pcol = gapcolHashTable[iHashIndex];
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while (pcol != NULL)
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{
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/* Check if this is the object we want */
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if (pcol->hobj == hobj)
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{
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/* Get the object pointer and bail out */
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pvObject = pcol->pvObj;
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break;
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}
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/* Go to the next entry */
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pcol = pcol->pcolNext;
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}
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/* Leave the critical section */
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LeaveCriticalSection(&gcsClientObjLinks);
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return pvObject;
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}
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PVOID
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WINAPI
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GdiRemoveClientObject(
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_In_ HGDIOBJ hobj)
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{
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PCLIENTOBJLINK pcol, *ppcol;
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ULONG iHashIndex;
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PVOID pvObject = NULL;
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/* Calculate the hash index */
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iHashIndex = (ULONG_PTR)hobj % _countof(gapcolHashTable);
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/* Enter the critical section */
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EnterCriticalSection(&gcsClientObjLinks);
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/* Loop the link entries in this hash bucket */
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ppcol = &gapcolHashTable[iHashIndex];
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while (*ppcol != NULL)
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{
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/* Get the current client object link */
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pcol = *ppcol;
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/* Check if this is the one we want */
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if (pcol->hobj == hobj)
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{
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/* Update the link pointer, removing this link */
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*ppcol = pcol->pcolNext;
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/* Get the object pointer */
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pvObject = pcol->pvObj;
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/* Free the link structure */
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HeapFree(GetProcessHeap(), 0, pcol);
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/* We're done */
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break;
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}
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/* Go to the next link pointer */
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ppcol = &(pcol->pcolNext);
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}
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/* Leave the critical section */
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LeaveCriticalSection(&gcsClientObjLinks);
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/* Return the object pointer, or NULL if we did not find it */
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return pvObject;
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}
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