Function buildWave8ByteExpansionLUT

src/fl/channels/wave8.cpp.hpp:313–324

Byte-indexed expansion LUT (#2526). Entry b = high-nibble expansion in symbols[0..3] + low-nibble expansion in symbols[4..7], matching wave8_convert_byte_to_wave8byte() exactly (so the byte path is bit-identical).

// symbols[0..3] + low-nibble expansion in symbols[4..7], matching
// wave8_convert_byte_to_wave8byte() exactly (so the byte path is bit-identical).
Wave8ByteExpansionLut buildWave8ByteExpansionLUT(const Wave8BitExpansionLut &nibble) {
    Wave8ByteExpansionLut out;
    for (int b = 0; b < 256; ++b) {
        const Wave8Bit *hi = nibble.lut[(b >> 4) & 0xF];
        const Wave8Bit *lo = nibble.lut[b & 0xF];
        for (int i = 0; i < 4; ++i) {
            out.lut[b].symbols[i] = hi[i];
            out.lut[b].symbols[i + 4] = lo[i];
        }
    }
    return out;
}

// ============================================================================
// Untranspose Functions (Testing Only - Not Optimized)