Skip to content

Latest commit

 

History

History
131 lines (86 loc) · 4.95 KB

nc-d3d10umddi-pfnd3d11_1ddi_videoprocessorsetstreamalpha.md

File metadata and controls

131 lines (86 loc) · 4.95 KB
Raw
UID title description old-location ms.date keywords ms.keywords req.header req.include-header req.target-type req.target-min-winverclnt req.target-min-winversvr req.kmdf-ver req.umdf-ver req.ddi-compliance req.unicode-ansi req.idl req.max-support req.namespace req.assembly req.type-library req.lib req.dll req.irql targetos tech.root req.typenames f1_keywords topic_type api_type api_location api_name
NC:d3d10umddi.PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA
PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA (d3d10umddi.h)
Sets the planar alpha for an input stream on the video processor.
display\videoprocessorsetstreamalpha.htm
05/10/2018
PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA callback function
PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA, PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA callback, d3d10umddi/pfnVideoProcessorSetStreamAlpha, display.videoprocessorsetstreamalpha, pfnVideoProcessorSetStreamAlpha, pfnVideoProcessorSetStreamAlpha callback function [Display Devices]
d3d10umddi.h
D3d10umddi.h
Desktop
Windows 8
Windows Server 2012
Windows
display
PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA
d3d10umddi/PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA
APIRef
kbSyntax
UserDefined
D3d10umddi.h
PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA

PFND3D11_1DDI_VIDEOPROCESSORSETSTREAMALPHA callback function

-description

Sets the planar alpha for an input stream on the video processor.

-parameters

-param unnamedParam1

hDevice [in]

A handle to the display device (graphics context).

-param unnamedParam2

hVideoProcessor [in]

A handle to the video processor object that was created through a call to the CreateVideoProcessor function.

-param unnamedParam3

StreamIndex [in]

The zero-based index of the input stream.

-param unnamedParam4

Enable [in]

If TRUE, alpha blending is to be enabled on the video processor.

-param unnamedParam5

Alpha [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.
 

-remarks

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 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
Note  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.
 

-see-also

CreateVideoProcessor

D3D11_1DDI_VIDEO_PROCESSOR_CAPS

GetVideoProcessorCaps

VideoProcessorSetOutputAlphaFillMode