Bewerken

Delen via

D3D12DDI_VIDEO_PROCESS_LUMA_KEY_0020 structure (d3d12umddi.h)

  • Artikel

Specifies values for luma keying.

Syntax

typedef struct D3D12DDI_VIDEO_PROCESS_LUMA_KEY_0020 {
  BOOL  Enable;
  FLOAT Lower;
  FLOAT Upper;
} D3D12DDI_VIDEO_PROCESS_LUMA_KEY_0020;

Members

Enable

Whether luma keying is enabled.

Lower

The lower bound for the luma key. The valid range is [0 ... 1]. If the Enable member is false, this value is ignored.

Upper

The upper bound for the luma key. The valid range is [0 ... 1]. If the Enable member is false, this value is ignored.

Remarks

The values of Lower and Upper are the lower and upper bounds of the luma key. For a format that has n bits per channel, these values are converted to luma values as follows:

value = f * ((1 << n) - 1)

Any pixel whose luma value falls within the upper and lower bounds, inclusive, is treated as transparent. For example, if the pixel format uses 8-bit luma, the upper bound is calculated as follows:

BYTE Y = BYTE(max (min (1.0, Upper), 0.0) * 255.0)

Note that the value is clamped to the range [0 ... 1] before multiplying by 255.

Requirements

Requirement Value
Header d3d12umddi.h (include D3d12umddi.h)