public DicomCodecParameters GetCodecParameters(XmlDocument parms)
{
DicomRleCodecParameters codecParms = new DicomRleCodecParameters();
XmlElement element = parms.DocumentElement;
if (element != null && element.Attributes["convertFromPalette"]!=null)
{
String boolString = element.Attributes["convertFromPalette"].Value;
bool convert;
if (false == bool.TryParse(boolString, out convert))
throw new ApplicationException("Invalid convertFromPalette value specified for RLE: " + boolString);
codecParms.ConvertPaletteToRGB = convert;
}
else
codecParms.ConvertPaletteToRGB = true;
return codecParms;
}
public void Decode(DicomCompressedPixelData oldPixelData, DicomUncompressedPixelData newPixelData, DicomCodecParameters parameters)
{
DicomRleCodecParameters rleParams = parameters as DicomRleCodecParameters ?? new DicomRleCodecParameters();
int pixelCount = oldPixelData.ImageWidth * oldPixelData.ImageHeight;
int numberOfSegments = oldPixelData.BytesAllocated * oldPixelData.SamplesPerPixel;
int segmentLength = (pixelCount & 1) == 1 ? pixelCount + 1 : pixelCount;
byte[] segment = new byte[segmentLength];
byte[] frameData = new byte[oldPixelData.UncompressedFrameSize];
for (int i = 0; i < oldPixelData.NumberOfFrames; i++)
{
IList <DicomFragment> rleData = oldPixelData.GetFrameFragments(i);
RLEDecoder decoder = new RLEDecoder(rleData);
if (decoder.NumberOfSegments != numberOfSegments)
{
throw new DicomCodecException("Unexpected number of RLE segments!");
}
for (int s = 0; s < numberOfSegments; s++)
{
decoder.DecodeSegment(s, segment);
int sample = s / oldPixelData.BytesAllocated;
int sabyte = s % oldPixelData.BytesAllocated;
int pos;
int offset;
if (newPixelData.PlanarConfiguration == 0)
{
pos = sample * oldPixelData.BytesAllocated;
offset = oldPixelData.SamplesPerPixel * oldPixelData.BytesAllocated;
}
else
{
pos = sample * oldPixelData.BytesAllocated * pixelCount;
offset = oldPixelData.BytesAllocated;
}
if (rleParams.ReverseByteOrder)
{
pos += sabyte;
}
else
{
pos += oldPixelData.BytesAllocated - sabyte - 1;
}
for (int p = 0; p < pixelCount; p++)
{
frameData[pos] = segment[p];
pos += offset;
}
}
newPixelData.AppendFrame(frameData);
}
}
virtual public DicomCodecParameters GetCodecParameters(DicomAttributeCollection dataSet)
{
DicomRleCodecParameters codecParms = new DicomRleCodecParameters { ConvertPaletteToRGB = true };
return codecParms;
}
public void Encode(DicomUncompressedPixelData oldPixelData, DicomCompressedPixelData newPixelData, DicomCodecParameters parameters)
{
DicomRleCodecParameters rleParams = parameters as DicomRleCodecParameters ?? new DicomRleCodecParameters();
// Convert to RGB
if (oldPixelData.HasPaletteColorLut && parameters.ConvertPaletteToRGB)
{
oldPixelData.ConvertPaletteColorToRgb();
newPixelData.HasPaletteColorLut = false;
newPixelData.SamplesPerPixel = oldPixelData.SamplesPerPixel;
newPixelData.PlanarConfiguration = oldPixelData.PlanarConfiguration;
newPixelData.PhotometricInterpretation = oldPixelData.PhotometricInterpretation;
}
int pixelCount = oldPixelData.ImageWidth * oldPixelData.ImageHeight;
int numberOfSegments = oldPixelData.BytesAllocated * oldPixelData.SamplesPerPixel;
for (int i = 0; i < oldPixelData.NumberOfFrames; i++)
{
RLEEncoder encoder = new RLEEncoder();
byte[] frameData = oldPixelData.GetFrame(i);
for (int s = 0; s < numberOfSegments; s++)
{
encoder.NextSegment();
int sample = s / oldPixelData.BytesAllocated;
int sabyte = s % oldPixelData.BytesAllocated;
int pos;
int offset;
if (newPixelData.PlanarConfiguration == 0)
{
pos = sample * oldPixelData.BytesAllocated;
offset = numberOfSegments;
}
else
{
pos = sample * oldPixelData.BytesAllocated * pixelCount;
offset = oldPixelData.BytesAllocated;
}
if (rleParams.ReverseByteOrder)
{
pos += sabyte;
}
else
{
pos += oldPixelData.BytesAllocated - sabyte - 1;
}
for (int p = 0; p < pixelCount; p++)
{
if (pos >= frameData.Length)
{
throw new DicomCodecException("");
}
encoder.Encode(frameData[pos]);
pos += offset;
}
encoder.Flush();
}
encoder.MakeEvenLength();
newPixelData.AddFrameFragment(encoder.GetBuffer());
}
}
