D3DKMDT_SHADOWSURFACEDATA structure (d3dkmdt.h)
The D3DKMDT_SHADOWSURFACEDATA structure describes a lockable shadow surface, which matches the primary surface in format and resolution for a given display mode.
Syntax
typedef struct _D3DKMDT_SHADOWSURFACEDATA {
[in] UINT Width;
[in] UINT Height;
[in] D3DDDIFORMAT Format;
[out] UINT Pitch;
} D3DKMDT_SHADOWSURFACEDATA;
Members
[in] Width
The width of the surface, in pixels. The driver returns the width value.
[in] Height
The height of the surface, in pixels. The driver returns the height value.
[in] Format
A D3DDDIFORMAT-typed value that indicates the pixel format of the surface. The driver returns the format value.
[out] Pitch
The width of the surface, in bytes. The driver must return the pitch value because the shadow surface is lockable.
Remarks
The D3DKMDT_SHADOWSURFACEDATA structure is passed by the Microsoft DirectX graphics kernel subsystem in a call to the display miniport driver's DxgkDdiGetStandardAllocationDriverData function to generate a description of a lockable shadow surface. The DirectX graphics kernel subsystem uses the description in a call to the display miniport driver's DxgkDdiCreateAllocation function to create the lockable shadow surface.
The CPU draws into the locked shadow surface, unlocks the shadow surface, and then issues bit-block transfer (bitblt) requests through the DxgkDdiPresent function from the shadow surface to the matched shared primary surface. Bit-block transfer requests are also issued to transfer data from a shared primary surface into the shadow surface.
A color conversion, stretch, or shrink operation is not required when copying data from or to a shadow surface because the source and destination formats and dimensions of shadow and shared primary surfaces always match.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista |
| Header | d3dkmdt.h |
See also
D3DKMDT_STANDARDALLOCATION_TYPE
DXGKARG_GETSTANDARDALLOCATIONDRIVERDATA