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