DXGK_RENDERKM_COMMAND structure (d3dkmddi.h)

Article
04/01/2021
2 minutes to read

The DXGK_RENDERKM_COMMAND structure is used to construct a command buffer to control GDI hardware-accelerated rendering.

Syntax

typedef struct _DXGK_RENDERKM_COMMAND {
  DXGK_RENDERKM_OPERATION OpCode;
  UINT                    CommandSize;
  union {
    DXGK_GDIARG_BITBLT         BitBlt;
    DXGK_GDIARG_COLORFILL      ColorFill;
    DXGK_GDIARG_ALPHABLEND     AlphaBlend;
    DXGK_GDIARG_STRETCHBLT     StretchBlt;
    DXGK_GDIARG_TRANSPARENTBLT TransparentBlt;
    DXGK_GDIARG_CLEARTYPEBLEND ClearTypeBlend;
  } Command;
} DXGK_RENDERKM_COMMAND;

Members

OpCode

[in] A DXGK_RENDERKM_OPERATION-type operation code that identifies the GDI hardware-accelerated rendering operation to process. For more information about GDI hardware acceleration, see the Remarks section.

CommandSize

[in] The size of the current command, in bytes. This is equal to the number of bytes from the beginning of DXGK_RENDERKM_COMMAND up to the next command.

Command

Command.BitBlt

Command.ColorFill

Command.AlphaBlend

Command.StretchBlt

Command.TransparentBlt

Command.ClearTypeBlend

Remarks

An array of variable-size DXGK_RENDERKM_COMMAND structures defines a command buffer that is used to control GDI hardware-accelerated rendering.

A display miniport driver should report that it supports command buffer processing for GDI hardware acceleration by setting DXGK_DRIVERCAPS->PresentationCaps.SupportKernelModeCommandBuffer to TRUE.

Note A display miniport driver should report that it supports GDI hardware acceleration only if the cache-coherent GPU aperture segment exists, and there is no significant performance penalty when the CPU accesses the memory.

Each command varies in length depending on the value of the OpCode member and the number of sub-rectangles in the command.

Requirements


Minimum supported client	Available in Windows 7 and later versions of the Windows operating systems.
Header	d3dkmddi.h (include D3dkmddi.h)

DXGK_RENDERKM_COMMAND structure (d3dkmddi.h)

Syntax

Members

Remarks

Requirements

See also

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