| 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 | ||||||||
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NC:d3dkmddi.DXGKDDI_VIDPNTOPOLOGY_GETNUMPATHSFROMSOURCE |
DXGKDDI_VIDPNTOPOLOGY_GETNUMPATHSFROMSOURCE (d3dkmddi.h) |
The pfnGetNumPathsFromSource function returns the number of video present paths that contain a specified video present source. |
display\dxgk_vidpntopology_interface_pfngetnumpathsfromsource.htm |
05/10/2018 |
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DXGKDDI_VIDPNTOPOLOGY_GETNUMPATHSFROMSOURCE, DXGKDDI_VIDPNTOPOLOGY_GETNUMPATHSFROMSOURCE callback, VidPnFunctions_6c0bd823-4803-474c-9948-22282c5b1e66.xml, d3dkmddi/pfnGetNumPathsFromSource, display.dxgk_vidpntopology_interface_pfngetnumpathsfromsource, pfnGetNumPathsFromSource, pfnGetNumPathsFromSource callback function [Display Devices] |
d3dkmddi.h |
D3dkmddi.h |
Desktop |
Windows Vista |
PASSIVE_LEVEL |
Windows |
display |
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The pfnGetNumPathsFromSource function returns the number of video present paths that contain a specified video present source.
A handle to a VidPN topology object. The display miniport driver previously obtained this handle by calling the pfnGetTopology function of the DXGK_VIDPN_INTERFACE interface.
An integer that identifies a particular video present source.
A pointer to a SIZE_T-typed variable that receives the number of paths that contain the specified source.
The pfnGetNumPathsFromSource function returns one of the following values:
| Return code | Description |
|---|---|
| STATUS_SUCCESS | The function succeeded. |
| STATUS_GRAPHICS_INVALID_VIDPN_TOPOLOGY | The handle supplied in hVidPnTopology was invalid. |
| STATUS_INVALID_PARAMETER | The pointer supplied in pNumPathsFromSource was in valid. |
A topology is a collection paths, each of which contains a (source, target) pair. It is possible for a particular source to appear in more than one path. For example, one source can be paired with two distinct targets in the case of a clone view.
VidPN source identifiers are assigned by the operating system. DxgkDdiStartDevice, implemented by the display miniport driver, returns the number N of video present sources supported by the display adapter. Then the operating system assigns identifiers 0, 1, 2, ... N - 1.
The D3DKMDT_HVIDPNTOPOLOGY data type is defined in D3dkmdt.h.
The D3DDDI_VIDEO_PRESENT_SOURCE_ID data type is defined in D3dukmdt.h.