PK_blend_ov_cliff_t    


typedef int PK_blend_ov_cliff_t;


This data type is used to indicate how to deal with cliff edge overflow.
It has three values:

    PK_blend_ov_cliff_no_c             prevent cliff edge overflow
    PK_blend_ov_cliff_diff_c           enable cliff edge overflow for different
                                       convexity
    PK_blend_ov_cliff_any_c            enable cliff edge overflow for any
                                       convexity