PDD_VPORTCB_GETFIELD callback function (ddrawint.h)
The DdVideoPortGetField callback function determines whether the current field of an interlaced signal is even or odd.
Syntax
PDD_VPORTCB_GETFIELD PddVportcbGetfield;
DWORD PddVportcbGetfield(
PDD_GETVPORTFIELDDATA unnamedParam1
)
{...}
Parameters
unnamedParam1
Points to a DD_GETVPORTFIELDDATA structure that contains the information required for the driver to determine whether the current field is even or odd.
Return value
DdVideoPortGetField returns one of the following callback codes:
Remarks
DirectDraw drivers that set the DDVPCAPS_READBACKFIELD flag in the dwCaps member of the DDVIDEOPORTCAPS structure must implement DdVideoPortGetField.
The driver should determine whether the current field is even or odd and write TRUE or FALSE in the bField member of the DD_GETVPORTFIELDDATA structure at lpGetField, accordingly. If the query cannot be performed because the hardware video port is disabled, the driver should return DDHAL_DRIVER_HANDLED and set DDERR_VIDEONOTACTIVE in the ddRVal member of DD_GETVPORTFIELDDATA.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Desktop |
| Header | ddrawint.h (include Winddi.h) |