Quantizer.h

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/*
 *    Copyright (C) 2016-2026 Grok Image Compression Inc.
 *
 *    This source code is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This source code is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#pragma once
 
#include "IStreamWriter.h"
 
namespace grk
{
struct grk_stepsize
{
  grk_stepsize() : expn(0), mant(0) {}
  uint8_t expn;
  uint16_t mant;
};
 
struct Quantizer
{
public:
  Quantizer(bool reversible, uint8_t guard_bits);
  virtual ~Quantizer() = default;
  // for compress
  void pull(grk_stepsize* stepptr);
  // for decompress
  void push(grk_stepsize* stepptr);
  virtual void generate(uint8_t decomps, uint8_t max_bit_depth, bool color_transform,
                        bool is_signed);
  virtual bool write(t1_t2::IStreamWriter* stream);
 
protected:
  uint32_t get_num_guard_bits() const;
  uint8_t Sqcd;
  union
  {
    uint8_t u8_SPqcd[97];
    uint16_t u16_SPqcd[97];
  };
  uint32_t num_decomps;
  bool isReversible;
};
 
} // namespace grk