XFORMOBJ_iGetFloatObjXform

ULONG XFORMOBJ_iGetFloatObjXform(

IN XFORMOBJ *pxo,
OUT FLOATOBJ_XFORM *pxform
);

XFORMOBJ_iGetFloatObjXform downloads a FLOATOBJ transform to the driver.

Parameters

pxo

Points to the XFORMOBJ structure that defines the transform to be downloaded.

pxform

Points to the buffer that is to receive the FLOATOBJ_XFORM structure. This parameter can be null.

Return Value

If an error occurs, the return value is DDI_ERROR. Otherwise, the return value is a complexity hint about the transform object. The value of this transform characterization can be one of the following:

Return Value Meaning
GX_IDENTITY Identity matrix; no translation offset.
GX_OFFSET Identity matrix; there is a translation offset.
GX_SCALE Off-diagonal matrix elements are zero.
GX_GENERAL Arbitrary 2 x 2 matrix and offset.

Comments

If pxform is not null, XFORMOBJ_iGetFloatObjXform loads a FLOATOBJ_XFORM into it. This function allows graphics drivers to emulate floating point arithmetic. Windows NT does not support kernel-mode floating point operations on some systems.

See Also

FLOATOBJ, XFORMOBJ