PTFlattenThresholdFlag

enum PTFlattenThresholdFlag {
/** Render (flatten) any text that is clipped or occluded. */
e_ptvery_strict,
/** Render text that are marginally clipped or occluded. */
e_ptstrict,
/** Render text that are somewhat clipped or occluded. */
e_ptdefault,
/** Only render text that are seriously clipped or occluded. */
e_ptkeep_most,
/** Only render text that are completely occluded, or used as a clipping path. */
e_ptkeep_all
}