Method read

src/OpenColorIO/fileformats/FileFormatHDL.cpp:307–588

}

CachedFileRcPtr
LocalFileFormat::read(std::istream & istream,
                      const std::string & /* fileName unused */,
                      Interpolation interp) const
{

    // this shouldn't happen
    if (!istream)
        throw Exception ("file stream empty when trying to read Houdini LUT");

    //
    CachedFileHDLRcPtr cachedFile = CachedFileHDLRcPtr (new CachedFileHDL ());

    Lut3DOpDataRcPtr lut3d_ptr;

    // Parse headers into key-value pairs
    StringToStringVecMap header_chunks;
    StringToStringVecMap::iterator iter;

    // Read headers, ending after the "LUT:" line
    readHeaders(header_chunks, istream);

    // Grab useful values from headers
    StringUtils::StringVec value;

    // "Version 3" - format version (currently one version
    // number per LUT type)
    value = findHeaderItem(header_chunks, "version", 1);
    cachedFile->hdlversion = value[0];

    // "Format any" - bit depth of image the LUT should be
    // applied to (this is basically ignored)
    value = findHeaderItem(header_chunks, "format", 1);
    cachedFile->hdlformat = value[0];

    // "Type 3d" - type of LUT
    {
        value = findHeaderItem(header_chunks, "type", 1);

        cachedFile->hdltype = value[0];
    }

    // "From 0.0 1.0" - range of input values
    {
        float from_min = 0.0f;
        float from_max = 1.0f;
        value = findHeaderItem(header_chunks, "from", 2);

        if(!StringToFloat(&from_min, value[0].c_str()) ||
            !StringToFloat(&from_max, value[1].c_str()))
        {
            std::ostringstream os;
            os << "Invalid float value(s) on 'From' line, '";
            os << value[0] << "' and '"  << value[1] << "'";
            throw Exception(os.str().c_str());
        }
        cachedFile->from_min = from_min;
        cachedFile->from_max = from_max;