decodeTransferU16()

u16 fl::decodeTransferU16	(	TransferFunction	transfer,
		u8	code )

Decode one 8-bit source code to u16 linear light under transfer.

Exact at both endpoints: code 0 -> 0, code 255 -> 65535.

Definition at line 79 of file transfer.cpp.hpp.

                                                                       {
    switch (transfer) {
    case TransferFunction::Srgb:
        return FL_PGM_READ_WORD_ALIGNED(&SRGB_DECODE_LUT[code]);
    case TransferFunction::Bt709:
        return FL_PGM_READ_WORD_ALIGNED(&BT709_DECODE_LUT[code]);
    case TransferFunction::Linear:
        break;
    }
    // Linear needs no table: 257 maps 0..255 onto 0..65535 exactly, so 0 and
    // 255 land on the endpoints without a rounding step.
    return static_cast<u16>(static_cast<u32>(code) * 257u);
}

References Bt709, FL_NO_EXCEPT, FL_PGM_READ_WORD_ALIGNED, Linear, and Srgb.

Referenced by processPixelLinearQ16(), and processPixelWideLinearQ16().

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