PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA - NtDoc
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// d3d10umddi.h
PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA Pfnd3d111DdiVideoprocessorsetstreamalpha;
VOID Pfnd3d111DdiVideoprocessorsetstreamalpha(
D3D10DDI_HDEVICE unnamedParam1,
D3D11_1DDI_HVIDEOPROCESSOR unnamedParam2,
UINT unnamedParam3,
BOOL unnamedParam4,
FLOAT unnamedParam5
)
{...}
View the official Windows Driver Kit DDI referenceNo description available.
Sets the planar alpha for an input stream on the video processor.
unnamedParam1hDevice [in]
A handle to the display device (graphics context).
unnamedParam2hVideoProcessor [in]
A handle to the video processor object that was created through a call to the CreateVideoProcessor function.
unnamedParam3StreamIndex [in]
The zero-based index of the input stream.
unnamedParam4Enable [in]
If TRUE, alpha blending is to be enabled on the video processor.
unnamedParam5Alpha [in]
A pointer to a FLOAT value that specifies the planar alpha value. The value can range from 0.0 (transparent) to 1.0 (opaque).
Note If the Enable parameter is FALSE, this parameter is ignored.
By default, alpha blending is disabled.
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 pixelCs = The color value of the source pixelAs = The per-pixel source alphaAp = The planar alpha valueAe = The palette-entry alpha value, or 1.0Note Palette-entry alpha values apply only to palettized color formats, and only when the device advertises support for the D3D11_1DDI_VIDEO_PROCESSOR_FEATURE_CAPS_ALPHA_PALETTE capability through the GetVideoProcessorCaps function. Otherwise, this factor equals 1.0.
The destination alpha value is computed according to the alpha fill mode. For more information, see VideoProcessorSetOutputAlphaFillMode
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_ALPHA_STREAM capability, it can be enabled or disabled to produce stereo video frames.
Note If the driver does not support the D3D11_1DDI_VIDEO_PROCESSOR_FEATURE_CAPS_STEREO capability, the Microsoft Direct3D runtime does not call the VideoProcessorSetStreamAlpha function.
D3D11_1DDI_VIDEO_PROCESSOR_CAPS
VideoProcessorSetOutputAlphaFillMode