CGBlendMode.xor
R = S*(1 - Da) + D*(1 - Sa). This XOR mode is only nominally related to the classical bitmap XOR operation, which is not supported by Core Graphics
Declaration
case xorR = S*(1 - Da) + D*(1 - Sa). This XOR mode is only nominally related to the classical bitmap XOR operation, which is not supported by Core Graphics
case xor