// d3d12umddi.h

typedef enum D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020 {
  D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_OPAQUE,
  D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_BACKGROUND,
  D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_DESTINATION,
  D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_SOURCE_STREAM
} ;
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Windows Driver Kit DDI reference (ne-d3d12umddi-d3d12ddi_video_process_alpha_fill_mode_0020)

D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020 enumeration

Description

Contains values for alpha fill modes.

Constants

`D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_OPAQUE`

Alpha values inside the target rectangle are set to opaque.

`D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_BACKGROUND`

Alpha values inside the target rectangle are set to the alpha value specified in the background color.

`D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_DESTINATION`

Existing alpha values remain unchanged in the output surface.

`D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_0020_SOURCE_STREAM`

Alpha values are taken from an input stream, scaled, and copied to the corresponding destination rectangle for that stream. The input stream is specified in the AlphaFillModeSourceStreamIndex member of the D3D12DDI_VIDEO_PROCESS_OUTPUT_STREAM_DESC structure. If the input stream does not have alpha data, the video processor sets the alpha values in the target rectangle to opaque. If the input stream is disabled or the source rectangle is empty, the alpha values in the target rectangle are not modified.

Remarks

The alpha fill mode is used in D3D12DDIARG_VIDEO_PROCESS_OUTPUT_STREAM_ARGUMENTS. The D3D12DDI_VIDEO_PROCESS_ALPHA_FILL_MODE_OPAQUE flag is always supported. The background, destination, and source stream modes are only supported when the driver reports D3D12DDI_VIDEO_PROCESS_FEATURE_SUPPORT_FLAG_ALPHA_FILL.

View the official Windows Driver Kit DDI reference

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