| Microsoft DirectX 9.0 |
The VMRSurfaceAllocationFlags enumeration is used with the IVMRSurfaceAllocator::AllocateSurface method to specify surface creation parameters.
Syntax
typedef enum {
AMAP_PIXELFORMAT_VALID = 0x01,
AMAP_3D_TARGET = 0x02,
AMAP_ALLOW_SYSMEM = 0x04,
AMAP_FORCE_SYSMEM = 0x08,
AMAP_DIRECTED_FLIP = 0x10,
AMAP_DXVA_TARGET = 0x20
} VMRSurfaceAllocationFlags;
Elements
AMAP_PIXELFORMAT_VALID
Indicates that the lpPxFmt field contains valid data that should be used to create the DirectDraw surface.
AMAP_3D_TARGET
Indicates that the DirectDraw surface created should also be a Direct3D render target that is created with the DDSCAPS_3DDEVICE flag set.
AMAP_ALLOW_SYSMEM
Indicates that if you can't allocate the DirectDraw surface in video memory you will try to allocate a system memory DirectDraw surface. (Note you should never allocate an AGP memory surface.)
AMAP_FORCE_SYSMEM
Force the surface to be created in system memory. Specify this if you will use GDI to process the image before it is renderered. The surface must match the current monitor display format (pixel depth).
AMAP_DIRECTED_FLIP
Means that when Flip is called you should Flip to the specified DirectDraw Surface passed as a parameter to the PresentImage function in the IVMRImagePresenter interface. Correct support for this flag is crucial in order to keep DXVA buffers seen by a video decoder in sync with the DXVA buffers seen by the graphics driver.
AMAP_DXVA_TARGET
Indicates that this surface will be used as a DXVA target.
Remarks
AMAP_3D_TARGET cannot be combined with AMAP_FORCE_SYSMEM or AMAP_ALLOW_SYSMEM because 3D surfaces cannot be created in system memory.
Requirements
Requires Microsoft® Windows® XP.
See Also