Method read

src/OpenColorIO/fileformats/FileFormatCSP.cpp:361–699

}

CachedFileRcPtr LocalFileFormat::read(std::istream & istream,
                                      const std::string & fileName,
                                      Interpolation interp) const
{
    Lut1DOpDataRcPtr lut1d_ptr;
    Lut3DOpDataRcPtr lut3d_ptr;

    // Try and read the LUT header.
    std::string line;
    bool notEmpty = nextline (istream, line);

    if (!notEmpty)
    {
        std::ostringstream os;
        os << "File " << fileName;
        os << ": file stream empty when trying to read csp LUT.";
        throw Exception(os.str().c_str());
    }

    if (!startswithU(line, "CSPLUTV100"))
    {
        std::ostringstream os;
        os << "File " << fileName << " doesn't seem to be a csp LUT, ";
        os << "expected 'CSPLUTV100'. First line: '" << line << "'.";
        throw Exception(os.str().c_str());
    }

    // Next line tells us if we are reading a 1D or 3D LUT.
    nextline (istream, line);
    if (!startswithU(line, "1D") && !startswithU(line, "3D"))
    {
        std::ostringstream os;
        os << "Unsupported CSP LUT type. Require 1D or 3D. ";
        os << "Found, '" << line << "' in " << fileName << ".";
        throw Exception(os.str().c_str());
    }
    std::string csptype = line;

    // Read meta data block.
    std::string metadata;
    bool lineUpdateNeeded = false;
    nextline (istream, line);
    if(startswithU(line, "BEGIN METADATA"))
    {
        while (!startswithU(line, "END METADATA") ||
                !istream)
        {
            nextline (istream, line);
            if (!startswithU(line, "END METADATA"))
                metadata += line + "\n";
        }
        lineUpdateNeeded = true;
    } // Else line update not needed.

    // Make 3 vectors of prelut inputs + output values.
    std::vector<float> prelut_in[3];
    std::vector<float> prelut_out[3];
    bool useprelut[3] = { false, false, false };