PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMLUMAKEY callback function

Sets the luma key for an input stream on the video processor.

Syntax

PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMLUMAKEY Pfnd3d111DdiVideoprocessorsetstreamlumakey;

void Pfnd3d111DdiVideoprocessorsetstreamlumakey(
   D3D10DDI_HDEVICE,
   D3D11_1DDI_HVIDEOPROCESSOR,
   UINT,
   BOOL,
   FLOAT,
   FLOAT
)
{...}

Parameters

D3D10DDI_HDEVICE

D3D11_1DDI_HVIDEOPROCESSOR

UINT

BOOL

FLOAT

FLOAT

Return Value

This callback function does not return a value.

Remarks

The values of Lower and Upper give the lower and upper bounds of the luma key by using a nominal range from zero to one. Given a format with n bits per channel, these values are converted to luma values as follows:

val = 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 from zero to one before multiplying by 255.

The driver reports its ability to support stereo alpha blending for an input stream in the D3D11_1DDI_VIDEO_PROCESSOR_CAPS structure that is returned through the GetVideoProcessorCaps function. If the driver supports the D3D11_1DDI_VIDEO_PROCESSOR_FEATURE_CAPS_LUMA_KEY capability, it can be enabled or disabled to set a luma key on an input stream of the video processor.

Note If the driver does not support the D3D11_1DDI_VIDEO_PROCESSOR_FEATURE_CAPS_LUMA_KEY capability, the Microsoft Direct3D runtime does not call the VideoProcessorSetStreamLumaKey function.

Requirements

   
Windows version Windows 8 Windows Server 2012
Target Platform Desktop
Header d3d10umddi.h (include D3d10umddi.h)

See Also

CreateVideoProcessor

D3D11_1DDI_VIDEO_PROCESSOR_CAPS

GetVideoProcessorCaps