EVT_IDD_CX_ADAPTER_QUERY_TARGET_INFO callback function (iddcx.h)
The OS calls an indirect display driver's EVT_IDD_CX_ADAPTER_QUERY_TARGET_INFO callback function to retrieve information about target capabilities.
Syntax
EVT_IDD_CX_ADAPTER_QUERY_TARGET_INFO EvtIddCxAdapterQueryTargetInfo;
NTSTATUS EvtIddCxAdapterQueryTargetInfo(
IDDCX_ADAPTER AdapterObject,
IDARG_IN_QUERYTARGET_INFO *pInArgs,
IDARG_OUT_QUERYTARGET_INFO *pOutArgs
)
{...}
Parameters
AdapterObject
[in] The adapter object of the adapter being queried. This adapter object was returned in a call to IddCxAdapterInitAsync.
pInArgs
[in] A pointer to an IDARG_IN_QUERYTARGET_INFO structure containing input arguments for this function.
pOutArgs
[out] A pointer to an IDARG_OUT_QUERYTARGET_INFO structure containing output arguments for this function.
Return value
If the operation is successful, the callback function must return STATUS_SUCCESS, or another status value for which NT_SUCCESS(status) equals TRUE. Otherwise, the callback should return an appropriate NTSTATUS error code.
Remarks
The OS calls EVT_IDD_CX_ADAPTER_QUERY_TARGET_INFO after a driver calls IddCxMonitorArrival. The OS uses the connector index provided by the driver in the IddCxMonitorCreate call for this monitor.
Specifying IDDCX_BITS_PER_COMPONENT_NONE is valid; however, to enable HDR, current Windows policies require either the ability to send 10 or more bits per component to a monitor or alternatively for the driver to support dithering of more than 8 bits per component down to 8 bits per component. The ability to dither allows HDR to be supported at 4K resolutions over HDMI 2.0.
For more information about HDR support, see IddCx version 1.10 updates.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 11, version 22H2 September Update (IddCx version 1.10) |
| Header | iddcx.h |