clientobj.c File Reference

#include <precomp.h>

Include dependency graph for clientobj.c:

Go to the source code of this file.

Classes
struct	_CLIENTOBJLINK

Typedefs
typedef struct _CLIENTOBJLINK	CLIENTOBJLINK
typedef struct _CLIENTOBJLINK *	PCLIENTOBJLINK

Functions
BOOL WINAPI	GdiCreateClientObjLink (_In_ HGDIOBJ hobj, _In_ PVOID pvObject)
PVOID WINAPI	GdiGetClientObjLink (_In_ HGDIOBJ hobj)
PVOID WINAPI	GdiRemoveClientObjLink (_In_ HGDIOBJ hobj)
HGDIOBJ WINAPI	GdiCreateClientObj (_In_ PVOID pvObject, _In_ GDILOOBJTYPE eObjType)
PVOID WINAPI	GdiDeleteClientObj (_In_ HGDIOBJ hobj)

Variables
CRITICAL_SECTION	gcsClientObjLinks
ULONG	gcClientObj
PCLIENTOBJLINK	gapcolHashTable [127]

Typedef Documentation

CLIENTOBJLINK

typedef struct _CLIENTOBJLINK CLIENTOBJLINK

PCLIENTOBJLINK

typedef struct _CLIENTOBJLINK * PCLIENTOBJLINK

Function Documentation

GdiCreateClientObj()

HGDIOBJ WINAPI GdiCreateClientObj	(	_In_ PVOID	pvObject,
		_In_ GDILOOBJTYPE	eObjType
	)

Definition at line 148 of file clientobj.c.

{
    HGDIOBJ hobj;
 
    /* Call win32k to create a client object handle */
    hobj = NtGdiCreateClientObj(eObjType);
    if (hobj == NULL)
    {
        return NULL;
    }
 
    /* Create the client object link */
    if (!GdiCreateClientObjLink(hobj, pvObject))
    {
        NtGdiDeleteClientObj(hobj);
        return NULL;
    }
 
    return hobj;
}

Referenced by alloc_gdi_handle(), and CreateMetaFileW().

GdiCreateClientObjLink()

BOOL WINAPI GdiCreateClientObjLink	(	_In_ HGDIOBJ	hobj,
		_In_ PVOID	pvObject
	)

Definition at line 24 of file clientobj.c.

{
    PCLIENTOBJLINK pcol;
    ULONG iHashIndex;
 
    /* Allocate a link structure */
    pcol = HeapAlloc(GetProcessHeap(), 0, sizeof(*pcol));
    if (pcol == NULL)
    {
        return FALSE;
    }
 
    /* Setup the link structure */
    pcol->hobj = hobj;
    pcol->pvObj = pvObject;
 
    /* Calculate the hash index */
    iHashIndex = (ULONG_PTR)hobj % _countof(gapcolHashTable);
 
    /* Enter the critical section */
    EnterCriticalSection(&gcsClientObjLinks);
 
    /* Insert the link structure */
    pcol->pcolNext = gapcolHashTable[iHashIndex];
    gapcolHashTable[iHashIndex] = pcol;
    gcClientObj++;
 
    /* Leave the critical section */
    LeaveCriticalSection(&gcsClientObjLinks);
 
    return TRUE;
}

Referenced by GDI_hdc_using_object(), and GdiCreateClientObj().

GdiDeleteClientObj()

PVOID WINAPI GdiDeleteClientObj

(

_In_ HGDIOBJ

hobj

)

Definition at line 173 of file clientobj.c.

{
    PVOID pvObject;
 
    /* Remove the client object link */
    pvObject = GdiRemoveClientObjLink(hobj);
    if (pvObject == NULL)
    {
        return NULL;
    }
 
    /* Call win32k to delete the handle */
    if (!NtGdiDeleteClientObj(hobj))
    {
        ASSERT(FALSE);
    }
 
    return pvObject;
}

Referenced by CloseMetaFile(), CreateMetaFileW(), free_gdi_handle(), and METADC_DeleteDC().

GdiGetClientObjLink()

PVOID WINAPI GdiGetClientObjLink

(

_In_ HGDIOBJ

hobj

)

Definition at line 61 of file clientobj.c.

{
    ULONG iHashIndex;
    PCLIENTOBJLINK pcol;
    PVOID pvObject = NULL;
 
    /* Calculate the hash index */
    iHashIndex = (ULONG_PTR)hobj % _countof(gapcolHashTable);
 
    /* Enter the critical section */
    EnterCriticalSection(&gcsClientObjLinks);
 
    /* Loop the link entries in this hash bucket */
    pcol = gapcolHashTable[iHashIndex];
    while (pcol != NULL)
    {
        /* Check if this is the object we want */
        if (pcol->hobj == hobj)
        {
            /* Get the object pointer and bail out */
            pvObject = pcol->pvObj;
            break;
        }
 
        /* Go to the next entry */
        pcol = pcol->pcolNext;
    }
 
    /* Leave the critical section */
    LeaveCriticalSection(&gcsClientObjLinks);
 
    return pvObject;
}

Referenced by GDI_GetObjPtr(), get_dc_ptr(), and get_metadc_ptr().

GdiRemoveClientObjLink()

PVOID WINAPI GdiRemoveClientObjLink

(

_In_ HGDIOBJ

hobj

)

Definition at line 98 of file clientobj.c.

{
    PCLIENTOBJLINK pcol, *ppcol;
    ULONG iHashIndex;
    PVOID pvObject = NULL;
 
    /* Calculate the hash index */
    iHashIndex = (ULONG_PTR)hobj % _countof(gapcolHashTable);
 
    /* Enter the critical section */
    EnterCriticalSection(&gcsClientObjLinks);
 
    /* Loop the link entries in this hash bucket */
    ppcol = &gapcolHashTable[iHashIndex];
    while (*ppcol != NULL)
    {
        /* Get the current client object link */
        pcol = *ppcol;
 
        /* Check if this is the one we want */
        if (pcol->hobj == hobj)
        {
            /* Update the link pointer, removing this link */
            *ppcol = pcol->pcolNext;
            gcClientObj--;
 
            /* Get the object pointer */
            pvObject = pcol->pvObj;
 
            /* Free the link structure */
            HeapFree(GetProcessHeap(), 0, pcol);
 
            /* We're done */
            break;
        }
 
        /* Go to the next link pointer */
        ppcol = &(pcol->pcolNext);
    }
 
    /* Leave the critical section */
    LeaveCriticalSection(&gcsClientObjLinks);
 
    /* Return the object pointer, or NULL if we did not find it */
    return pvObject;
}

Referenced by GDI_hdc_not_using_object(), GdiDeleteClientObj(), and METADC_RosGlueDeleteObject().

Variable Documentation

gapcolHashTable

PCLIENTOBJLINK gapcolHashTable[127]

Definition at line 20 of file clientobj.c.

Referenced by GdiCreateClientObjLink(), GdiGetClientObjLink(), and GdiRemoveClientObjLink().

gcClientObj

ULONG gcClientObj

Definition at line 11 of file clientobj.c.

Referenced by DeleteObject(), GdiCreateClientObjLink(), and GdiRemoveClientObjLink().

gcsClientObjLinks

CRITICAL_SECTION gcsClientObjLinks

Definition at line 10 of file clientobj.c.

Referenced by GdiCreateClientObjLink(), GdiGetClientObjLink(), GdiProcessSetup(), GdiProcessShutdown(), and GdiRemoveClientObjLink().