CONST_DDOVERFXFLAGS

The flags in the CONST_DDOVERFXFLAGS enumeration are used by the lDDFX member in the DDOVERLAYFX type to specify how the overlay is used.

Enum CONST_DDPALFLAGS
    DDOVERFX_ARITHSTRETCHY   = 1
    DDOVERFX_MIRRORLEFTRIGHT = 2
    DDOVERFX_MIRRORUPDOWN    = 4
End Enum

DDOVERFX_ARITHSTRETCHY

If stretching, use arithmetic stretching along the y-axis for this overlay.

DDOVERFX_MIRRORLEFTRIGHT

Mirror the overlay around the vertical axis.

DDOVERFX_MIRRORUPDOWN

Mirror the overlay around the horizontal axis.