internal static void Encode(
DicomPixelData oldPixelData,
DicomPixelData newPixelData,
DicomJpeg2000Params parameters)
{
if ((oldPixelData.PhotometricInterpretation == PhotometricInterpretation.YbrFull422)
|| (oldPixelData.PhotometricInterpretation == PhotometricInterpretation.YbrPartial422)
|| (oldPixelData.PhotometricInterpretation == PhotometricInterpretation.YbrPartial420))
{
throw new InvalidOperationException(
"Photometric Interpretation '" + oldPixelData.PhotometricInterpretation
+ "' not supported by JPEG 2000 encoder");
}
var jparams = parameters ?? new DicomJpeg2000Params();
jparams.Irreversible = newPixelData.IsLossy;
jparams.AllowMCT = oldPixelData.PhotometricInterpretation == PhotometricInterpretation.Rgb;
var pixelCount = oldPixelData.Height * oldPixelData.Width;
for (var frame = 0; frame < oldPixelData.NumberOfFrames; frame++)
{
var frameData = oldPixelData.GetFrame(frame);
var nc = oldPixelData.SamplesPerPixel;
var sgnd = oldPixelData.PixelRepresentation == PixelRepresentation.Signed
&& !jparams.EncodeSignedPixelValuesAsUnsigned;
var comps = new int[nc][];
var colorSpace = GetJpegColorSpace(oldPixelData.PhotometricInterpretation);
for (var c = 0; c < nc; c++)
{
var comp = new int[pixelCount];
var pos = oldPixelData.PlanarConfiguration == PlanarConfiguration.Planar ? (c * pixelCount) : c;
var offset = oldPixelData.PlanarConfiguration == PlanarConfiguration.Planar ? 1 : nc;
if (oldPixelData.BytesAllocated == 1)
{
var data = frameData.Data;
if (sgnd)
{
if (oldPixelData.BitsStored < 8)
{
var sign = (byte)(1 << oldPixelData.HighBit);
var mask = (byte)(0xff >> (oldPixelData.BitsAllocated - oldPixelData.BitsStored));
for (var p = 0; p < pixelCount; p++)
{
var pixel = (sbyte)data[pos];
comp[p] = (pixel & sign) > 0 ? -(((-pixel) & mask) + 1) : pixel;
pos += offset;
}
}
else
{
for (var p = 0; p < pixelCount; p++)
{
comp[p] = (sbyte)data[pos];
pos += offset;
}
}
}
else
{
for (var p = 0; p < pixelCount; p++)
{
comp[p] = data[pos];
pos += offset;
}
}
}
#if SUPPORT16BIT
else if (oldPixelData.BytesAllocated == 2)
{
if (sgnd)
{
if (oldPixelData.BitsStored < 16)
{
var frameData16 = new ushort[pixelCount];
Buffer.BlockCopy(frameData.Data, 0, frameData16, 0, (int)frameData.Size);
var sign = (ushort)(1 << oldPixelData.HighBit);
var mask = (ushort)(0xffff >> (oldPixelData.BitsAllocated - oldPixelData.BitsStored));
for (var p = 0; p < pixelCount; p++)
{
var pixel = frameData16[pos];
comp[p] = (pixel & sign) > 0 ? -(((-pixel) & mask) + 1) : pixel;
pos += offset;
}
}
else
{
var frameData16 = new short[pixelCount];
Buffer.BlockCopy(frameData.Data, 0, frameData16, 0, (int)frameData.Size);
for (var p = 0; p < pixelCount; p++)
{
comp[p] = frameData16[pos];
pos += offset;
}
}
}
else
{
var frameData16 = new ushort[pixelCount];
Buffer.BlockCopy(frameData.Data, 0, frameData16, 0, (int)frameData.Size);
for (var p = 0; p < pixelCount; p++)
{
comp[p] = frameData16[pos];
pos += offset;
}
}
}
#endif
else
{
throw new InvalidOperationException(
$"JPEG 2000 codec does not support Bits Allocated == {oldPixelData.BitsAllocated}");
}
comps[c] = comp;
}
var image = new PortableImageSource(
oldPixelData.Width,
oldPixelData.Height,
nc,
oldPixelData.BitsAllocated,
Enumerable.Repeat(sgnd, nc).ToArray(),
comps);
try
{
var cbuf = J2kImage.ToBytes(image, ToParameterList(jparams, false));
newPixelData.AddFrame(new MemoryByteBuffer(cbuf));
}
catch (Exception e)
{
throw new InvalidOperationException("Unable to JPEG 2000 encode image", e);
}
}
if (oldPixelData.PhotometricInterpretation == PhotometricInterpretation.Rgb)
{
newPixelData.PlanarConfiguration = PlanarConfiguration.Interleaved;
if (jparams.AllowMCT && jparams.UpdatePhotometricInterpretation)
{
if (newPixelData.IsLossy && jparams.Irreversible) newPixelData.PhotometricInterpretation = PhotometricInterpretation.YbrIct;
else newPixelData.PhotometricInterpretation = PhotometricInterpretation.YbrRct;
}
}
}
