/// <summary>
/// Gets the VOI data LUTs for specified frame.
/// </summary>
/// <param name="frameNumber"></param>
/// <returns></returns>
internal IList <VoiDataLut> GetFrameVoiDataLuts(int frameNumber)
{
Platform.CheckPositive(frameNumber, "frameNumber");
lock (_syncLock)
{
var cacheKey = VoiDataLutsCacheKey.RootKey;
var dataset = (IDicomAttributeProvider)DataSource;
// attempt to find the VOI LUT Sequence in a functional group pertaining to the requested frame
bool isFrameSpecific;
DicomAttribute dicomAttribute;
var item = _functionalGroups.GetFrameFunctionalGroupItem(frameNumber, DicomTags.VoiLutSequence, out isFrameSpecific);
if (item != null && item.TryGetAttribute(DicomTags.VoiLutSequence, out dicomAttribute))
{
cacheKey = isFrameSpecific ? VoiDataLutsCacheKey.GetFrameKey(frameNumber) : VoiDataLutsCacheKey.SharedKey;
dataset = item;
}
IList <VoiDataLut> dataLuts;
if (!_frameVoiDataLuts.TryGetValue(cacheKey, out dataLuts))
{
_frameVoiDataLuts.Add(cacheKey, dataLuts = CreateVoiDataLuts(dataset));
}
return(dataLuts);
}
}
