DD_GETHEAPALIGNMENTDATA structure (dmemmgr.h)
The DD_GETHEAPALIGNMENTDATA structure contains data on required alignments from a particular heap.
Syntax
typedef struct _DD_GETHEAPALIGNMENTDATA {
ULONG_PTR dwInstance;
DWORD dwHeap;
HRESULT ddRVal;
VOID *GetHeapAlignment;
HEAPALIGNMENT Alignment;
} DD_GETHEAPALIGNMENTDATA, *PDD_GETHEAPALIGNMENTDATA;
Members
dwInstance
Indicates the driver context as returned from the driver initialization routine and stored in the dhpDev member of the DD_DIRECTDRAW_GLOBAL structure.
dwHeap
Specifies the heap index passed by Microsoft DirectDraw. See the Remarks section for more information.
ddRVal
Specifies the location in which the driver writes the return value of the DdGetDriverInfo callback for a GUID_GetHeapAlignment query. A return code of DD_OK indicates success. For more information, see Return Values for DirectDraw.
GetHeapAlignment
Unused on Microsoft Windows 2000 and later versions of the operating system.
Alignment
Points to a HEAPALIGNMENT structure filled in by the driver.
Remarks
The dwHeap member is the ordinal number of the heap for which alignment data is being requested. In other words, it is the index into the array of VIDEOMEMORY structures pointed to by the pvmList parameter of the DrvGetDirectDrawInfo driver function.
Requirements
| Requirement | Value |
|---|---|
| Header | dmemmgr.h (include Dmemmgr.h) |