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D3D12_VIDEO_PROCESS_ALPHA_BLENDING structure (d3d12video.h)

  • Article

Specifies alpha blending parameters for video processing. Used by the [D3D12_VIDEO_PROCESS_INPUT_STREAM_ARGUMENTS]ns-d3d12video-d3d12_video_process_input_stream_arguments) structure.

Syntax

typedef struct D3D12_VIDEO_PROCESS_ALPHA_BLENDING {
  BOOL  Enable;
  FLOAT Alpha;
} D3D12_VIDEO_PROCESS_ALPHA_BLENDING;

Members

Enable

A boolean value specifying whether alpha blending is enabled.

Alpha

The planar alpha value. The value can range from 0.0 (transparent) to 1.0 (opaque). If Enable is FALSe, this parameter is ignored.

Remarks

For each pixel, the destination color value is computed as follows:

Cd = Cs * (As * Ap * Ae) + Cd * (1.0 - As * Ap * Ae)

where:

  • Cd = The color value of the destination pixel
  • Cs = The color value of the source pixel
  • As = The per-pixel source alpha
  • Ap = The planar alpha value
  • Ae = The palette-entry alpha value, or 1.0 (palette-entry alpha values apply only to palettized color formats)

Requirements

Requirement Value
Header d3d12video.h