CGBlendMode.plusDarker R = MAX(0, 1 - ((1 - D) + (1 - S))) Declarationcase plusDarker See AlsoConstantsCGBlendMode.normalCGBlendMode.multiplyCGBlendMode.screenCGBlendMode.overlayCGBlendMode.darkenCGBlendMode.lightenCGBlendMode.colorDodgeCGBlendMode.colorBurnCGBlendMode.softLightCGBlendMode.hardLightCGBlendMode.differenceCGBlendMode.exclusionCGBlendMode.hueCGBlendMode.saturationCGBlendMode.color