Commits on Jul 22, 2024

1. Use LUT for linear to sRGB conversion …

   Using a LUT for the linear to sRGB conversion improves decoding
   performance for the decode_into benchmark:
   
   ```
   decode_into LGF5]+Yk^6#M@-5c,1J5@[or[Q6./200
       time:   [766.58 µs 769.86 µs 776.05 µs]
       change: [-62.967% -62.784% -62.602%] (p = 0.00 < 0.05)
       Performance has improved.
   ```
   
   However, the size of the LUT is 8.192 u8. The `fast-linear-to-srgb`
   feature flag was added, which is enabled by default. In cases where
   binary size is more important than performance, the feature can be
   disabled.
   
   Another note in the implementation: using a lookup table reduces the
   accuracy of the conversion, compared to the original implementation.
   But all current tests pass. Higher accuracy can be achieved by
   increasing the LUT size.

   

   thvdveld committed Jul 22, 2024
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