Function compress

depends/lodepng/lodepng.cpp:6310–6320

#ifdef LODEPNG_COMPILE_ENCODER
unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
                  const LodePNGCompressSettings& settings) {
  unsigned char* buffer = 0;
  size_t buffersize = 0;
  unsigned error = zlib_compress(&buffer, &buffersize, in, insize, &settings);
  if(buffer) {
    out.insert(out.end(), &buffer[0], &buffer[buffersize]);
    lodepng_free(buffer);
  }
  return error;
}

unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
                  const LodePNGCompressSettings& settings) {