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DXRUNINFO structure

  • Article

Describes run information associated with a DXSurface object.

Syntax

typedef struct DXRUNINFO {
  unsigned long Type  :2;
  unsigned long Count  :30;
} DXRUNINFO;

Members

Type

Value of type unsigned long that indicates the type of sample in the run. This can be one of the following types.

DXRUNTYPE_CLEAR

The corresponding samples are clear (alpha equals zero). They either have the alpha set to 0, or they match the color key.

DXRUNTYPE_TRANS

The corresponding samples are translucent. Alpha has a value between 0 and 255.

DXRUNTYPE_OPAQUE

The corresponding samples are opaque (alpha equals 255).

DXRUNTYPE_UNKNOWN

The pixel types have not been recorded by the surface; you should examine each sample when processing.

Count

Value of type unsigned long that indicates the number of samples in the run.

Remarks

A run of samples is a number of adjacent samples in a row of a DXSurface with similar alpha characteristics. An entire row can be made of many runs, or only one, depending on the image stored in the DXSurface. Arrays of DXRUNINFO structures are returned from the IDXARGBReadPtr::MoveAndGetRunInfo method to describe a row and can be used to optimize alpha blending operations on DXSurface.

Requirements

Minimum supported client

Windows XP

Minimum supported server

Windows 2000 Server

Header

 Dxtrans.h

IDL

 Dxtrans.idl