/// <inheritdoc/>
protected override void Decompress(BufferedReadStream stream, int byteCount, int stripHeight, Span <byte> buffer)
{
long pos = stream.Position;
using (var deframeStream = new ZlibInflateStream(
stream,
() =>
{
int left = (int)(byteCount - (stream.Position - pos));
return(left > 0 ? left : 0);
}))
{
deframeStream.AllocateNewBytes(byteCount, true);
DeflateStream dataStream = deframeStream.CompressedStream;
int totalRead = 0;
while (totalRead < buffer.Length)
{
int bytesRead = dataStream.Read(buffer, totalRead, buffer.Length - totalRead);
if (bytesRead <= 0)
{
break;
}
totalRead += bytesRead;
}
}
if (this.Predictor == TiffPredictor.Horizontal)
{
HorizontalPredictor.Undo(buffer, this.Width, this.colorType, this.isBigEndian);
}
}
/// <inheritdoc/>
public override void CompressStrip(Span <byte> rows, int height)
{
if (this.Predictor == TiffPredictor.Horizontal)
{
HorizontalPredictor.ApplyHorizontalPrediction(rows, this.BytesPerRow, this.BitsPerPixel);
}
this.lzwEncoder.Encode(rows, this.Output);
}
/// <inheritdoc/>
protected override void Decompress(BufferedReadStream stream, int byteCount, int stripHeight, Span <byte> buffer)
{
var decoder = new TiffLzwDecoder(stream);
decoder.DecodePixels(buffer);
if (this.Predictor == TiffPredictor.Horizontal)
{
HorizontalPredictor.Undo(buffer, this.Width, this.colorType, this.isBigEndian);
}
}
