PanasonicV4Decompressor.h

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/*
    RawSpeed - RAW file decoder.
 
    Copyright (C) 2017-2018 Roman Lebedev
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library 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
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
 
#pragma once
 
#include "adt/Point.h"
#include "common/RawImage.h"
#include "decompressors/AbstractDecompressor.h"
#include "io/ByteStream.h"
#include <cstdint>
#include <vector>
 
namespace rawspeed {
 
class PanasonicV4Decompressor final : public AbstractDecompressor {
  static constexpr uint32_t BlockSize = 0x4000;
 
  static constexpr int PixelsPerPacket = 14;
 
  static constexpr uint32_t BytesPerPacket = 16;
 
  static constexpr uint32_t PacketsPerBlock = BlockSize / BytesPerPacket;
 
  static constexpr uint32_t PixelsPerBlock = PixelsPerPacket * PacketsPerBlock;
 
  class ProxyStream;
 
  RawImage mRaw;
  ByteStream input;
  bool zero_is_bad;
 
  // The RW2 raw image buffer is split into sections of BufSize bytes.
  // If section_split_offset is 0, then the last section is not necessarily
  // full. If section_split_offset is not 0, then each section has two parts:
  //     bytes: [0..section_split_offset-1][section_split_offset..BufSize-1]
  //     pixels: [a..b][0..a-1]
  //   I.e. these two parts need to be swapped around.
  uint32_t section_split_offset;
 
  struct Block final {
    ByteStream bs;
    iPoint2D beginCoord;
    // The rectangle is an incorrect representation. All the rows
    // between the first and last one span the entire width of the image.
    iPoint2D endCoord;
 
    Block() = default;
    Block(ByteStream bs_, iPoint2D beginCoord_, iPoint2D endCoord_)
        : bs(bs_), beginCoord(beginCoord_), endCoord(endCoord_) {}
  };
 
  // If really wanted, this vector could be avoided,
  // and each Block computed on-the-fly
  std::vector<Block> blocks;
 
  void chopInputIntoBlocks();
 
  inline void
  processPixelPacket(ProxyStream& bits, int row, int col,
                     std::vector<uint32_t>* zero_pos) const noexcept;
 
  void processBlock(const Block& block,
                    std::vector<uint32_t>* zero_pos) const noexcept;
 
  void decompressThread() const noexcept;
 
public:
  PanasonicV4Decompressor(RawImage img, ByteStream input_, bool zero_is_not_bad,
                          uint32_t section_split_offset_);
 
  void decompress() const noexcept;
};
 
} // namespace rawspeed