ErfDecoder.cpp

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/*
    RawSpeed - RAW file decoder.
 
    Copyright (C) 2009-2014 Klaus Post
    Copyright (C) 2014 Pedro Côrte-Real
 
    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
*/
 
#include "decoders/ErfDecoder.h"
#include "adt/Point.h"
#include "bitstreams/BitStreams.h"
#include "common/RawImage.h"
#include "decoders/RawDecoderException.h"
#include "decoders/SimpleTiffDecoder.h"
#include "decompressors/UncompressedDecompressor.h"
#include "io/Buffer.h"
#include "io/ByteStream.h"
#include "io/Endianness.h"
#include "tiff/TiffEntry.h"
#include "tiff/TiffIFD.h"
#include "tiff/TiffTag.h"
#include <array>
#include <memory>
#include <string>
 
namespace rawspeed {
 
class CameraMetaData;
 
bool ErfDecoder::isAppropriateDecoder(const TiffRootIFD* rootIFD,
                                      [[maybe_unused]] Buffer file) {
  const auto id = rootIFD->getID();
  const std::string& make = id.make;
 
  // FIXME: magic
 
  return make == "SEIKO EPSON CORP.";
}
 
void ErfDecoder::checkImageDimensions() {
  if (width > 3040 || height > 2024)
    ThrowRDE("Unexpected image dimensions found: (%u; %u)", width, height);
}
 
RawImage ErfDecoder::decodeRawInternal() {
  SimpleTiffDecoder::prepareForRawDecoding();
 
  UncompressedDecompressor u(
      ByteStream(DataBuffer(mFile.getSubView(off, c2), Endianness::little)),
      mRaw, iRectangle2D({0, 0}, iPoint2D(width, height)),
      (12 * width / 8) + ((width + 2) / 10), 12, BitOrder::MSB);
  mRaw->createData();
 
  u.decode12BitRawWithControl<Endianness::big>();
 
  return mRaw;
}
 
void ErfDecoder::decodeMetaDataInternal(const CameraMetaData* meta) {
  setMetaData(meta, "", 0);
 
  if (mRootIFD->hasEntryRecursive(TiffTag::EPSONWB)) {
    const TiffEntry* wb = mRootIFD->getEntryRecursive(TiffTag::EPSONWB);
    if (wb->count == 256) {
      // Magic values taken directly from dcraw
      std::array<float, 4> wbCoeffs = {};
      wbCoeffs[0] = static_cast<float>(wb->getU16(24)) * 508.0F * 1.078F /
                    static_cast<float>(0x10000);
      wbCoeffs[1] = 1.0F;
      wbCoeffs[2] = static_cast<float>(wb->getU16(25)) * 382.0F * 1.173F /
                    static_cast<float>(0x10000);
      mRaw->metadata.wbCoeffs = wbCoeffs;
    }
  }
}
 
} // namespace rawspeed