Improvement in decoding speed and fix a bug in encoding

osamu620 / OpenHTJ2K

An open source implementation of ITU-T Rec.814 | ISO 15444-15 (a.k.a. HTJ2K).

BSD 3-Clause "New" or "Revised" License

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Closed osamu620 closed 2 years ago

osamu620 commented 2 years ago

Decoding speed is improved a little.
Fix a bug in quantization: With very small Qstep values, the quantized coefficients were out of range. To fix this overflow, the quantization is now done with a 32-bit precision buffer.