Method Alpha

externals/bc_decoder/bc_decoder.cpp:972–974

            }

            constexpr Bitfield Alpha(int idx) const {
                return Blue(NumColors() - 1).Then(AB * idx).Then(AB);
            }

            constexpr Bitfield EndpointPBit(int idx) const {
                return Alpha(NumColors() - 1).Then(EPB * idx).Then(EPB);