Method decodeRawInternal

src/librawspeed/decoders/DcrDecoder.cpp:56–114

}

RawImage DcrDecoder::decodeRawInternal() {
  SimpleTiffDecoder::prepareForRawDecoding();

  ByteStream input(DataBuffer(mFile->getSubView(off), Endianness::little));

  int compression = raw->getEntry(COMPRESSION)->getU32();
  if (65000 != compression)
    ThrowRDE("Unsupported compression %d", compression);

  TiffEntry* ifdoffset = mRootIFD->getEntryRecursive(KODAK_IFD);
  if (!ifdoffset)
    ThrowRDE("Couldn't find the Kodak IFD offset");

  NORangesSet<Buffer> ifds;

  assert(ifdoffset != nullptr);
  TiffRootIFD kodakifd(nullptr, &ifds, ifdoffset->getRootIfdData(),
                       ifdoffset->getU32());

  TiffEntry* linearization = kodakifd.getEntryRecursive(KODAK_LINEARIZATION);
  if (!linearization ||
      !(linearization->count == 1024 || linearization->count == 4096) ||
      linearization->type != TIFF_SHORT)
    ThrowRDE("Couldn't find the linearization table");

  assert(linearization != nullptr);
  auto linTable = linearization->getU16Array(linearization->count);

  RawImageCurveGuard curveHandler(&mRaw, linTable, uncorrectedRawValues);

  // FIXME: dcraw does all sorts of crazy things besides this to fetch
  //        WB from what appear to be presets and calculate it in weird ways
  //        The only file I have only uses this method, if anybody careas look
  //        in dcraw.c parse_kodak_ifd() for all that weirdness
  TiffEntry* blob = kodakifd.getEntryRecursive(static_cast<TiffTag>(0x03fd));
  if (blob && blob->count == 72) {
    for (auto i = 0U; i < 3; i++) {
      const auto mul = blob->getU16(20 + i);
      if (0 == mul)
        ThrowRDE("WB coeffient is zero!");
      mRaw->metadata.wbCoeffs[i] = 2048.0F / mul;
    }
  }

  const int bps = [CurveSize = linearization->count]() -> int {
    switch (CurveSize) {
    case 1024:
      return 10;
    case 4096:
      return 12;
    }
    __builtin_unreachable();
  }();

  KodakDecompressor k(mRaw, input, bps, uncorrectedRawValues);
  k.decompress();

  return mRaw;