CDLTransformRcPtr CDLTransform::CreateFromFile(const char * src, const char * cccid)
{
if(!src || (strlen(src) == 0) || !cccid)
{
std::ostringstream os;
os << "Error loading CDL xml. ";
os << "Source file not specified.";
throw Exception(os.str().c_str());
}
// Check cache
AutoMutex lock(g_cacheMutex);
{
CDLTransformMap::iterator iter =
g_cache.find(GetCDLLocalCacheKey(src,cccid));
if(iter != g_cache.end())
{
return iter->second;
}
}
std::ifstream istream(src);
if(istream.fail()) {
std::ostringstream os;
os << "Error could not read CDL source file '" << src;
os << "'. Please verify the file exists and appropriate ";
os << "permissions are set.";
throw Exception (os.str().c_str());
}
// Read the file into a string.
std::ostringstream rawdata;
rawdata << istream.rdbuf();
std::string xml = rawdata.str();
if(xml.empty())
{
std::ostringstream os;
os << "Error loading CDL xml. ";
os << "The specified source file, '";
os << src << "' appears to be empty.";
throw Exception(os.str().c_str());
}
TiXmlDocument doc;
doc.Parse(xml.c_str());
if(doc.Error())
{
std::ostringstream os;
os << "Error loading CDL xml from file '";
os << src << "'. ";
os << doc.ErrorDesc() << " (line ";
os << doc.ErrorRow() << ", character ";
os << doc.ErrorCol() << ")";
throw Exception(os.str().c_str());
}
if(!doc.RootElement())
{
std::ostringstream os;
os << "Error loading CDL xml from file '";
os << src << "'. ";
os << "Please confirm the xml is valid.";
throw Exception(os.str().c_str());
}
std::string rootValue = doc.RootElement()->Value();
if(rootValue == "ColorCorrection")
{
// Load a single ColorCorrection into the cache
CDLTransformRcPtr cdl = CDLTransform::Create();
LoadCDL(cdl.get(), doc.RootElement()->ToElement());
g_cache[GetCDLLocalCacheKey(src,cccid)] = cdl;
return cdl;
}
else if(rootValue == "ColorCorrectionCollection")
{
// Load all CCs from the ColorCorrectionCollection
// into the cache
CDLTransformMap transforms;
GetCDLTransforms(transforms, doc.RootElement());
if(transforms.empty())
{
std::ostringstream os;
os << "Error loading ccc xml. ";
os << "No ColorCorrection elements found in file '";
os << src << "'.";
throw Exception(os.str().c_str());
}
for(CDLTransformMap::iterator iter = transforms.begin();
iter != transforms.end();
++iter)
{
g_cache[GetCDLLocalCacheKey(src,iter->first)] = iter->second;
}
CDLTransformMap::iterator cciter = g_cache.find(GetCDLLocalCacheKey(src,cccid));
if(cciter == g_cache.end())
{
std::ostringstream os;
os << "Error loading ccc xml. ";
os << "The specified cccid " << cccid << " ";
os << "could not be found in file '";
os << src << "'.";
throw Exception(os.str().c_str());
}
return cciter->second;
}
std::ostringstream os;
os << "Error loading CDL xml from file '";
os << src << "'. ";
os << "Root xml element is type '" << rootValue << "', ";
os << "ColorCorrection or ColorCorrectionCollection expected.";
throw Exception(os.str().c_str());
}
