/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int horizontalSubsampling = _horizontalSubsampling;
int verticalSubsampling = _verticalSubsampling;
if (horizontalSubsampling == 1 && verticalSubsampling == 1)
{
return(next.RunAsync(context));
}
if (_isPlanar)
{
ProcessPlanarData(context);
}
else
{
ProcessChunkyData(context);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bytesPerScanline = 6 * context.SourceImageSize.Width;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffBgra64> writer = context.GetWriter <TiffBgra64>();
int rows = context.ReadSize.Height;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffBgra64> pixelSpanHandle = writer.GetRowSpan(row);
Span <byte> rowDestinationSpan = MemoryMarshal.Cast <TiffBgra64, byte>(pixelSpanHandle.GetSpan());
CopyScanlineRgbToBgra(sourceSpan.Slice(6 * context.SourceReadOffset.X, 6 * context.ReadSize.Width), rowDestinationSpan.Slice(0, 8 * context.ReadSize.Width), context.ReadSize.Width, context.IsLittleEndian == BitConverter.IsLittleEndian);
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bitCount = _bitCount;
bool isHigherOrderBitsFirst = _fillOrder != TiffFillOrder.LowerOrderBitsFirst;
int bytesPerScanline = (context.SourceImageSize.Width * bitCount + 7) / 8;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffGray16> writer = context.GetWriter <TiffGray16>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
// BitReader.Read reads bytes in big-endian way, we only need to reverse the endianness if the source is little-endian.
bool reverseEndianness = context.IsLittleEndian && bitCount % 8 == 0;
bool canDoFastPath = bitCount >= 16 && !reverseEndianness;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffGray16> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffGray16> pixelSpan = pixelSpanHandle.GetSpan();
var bitReader = new BitReader(sourceSpan.Slice(0, bytesPerScanline), isHigherOrderBitsFirst);
bitReader.Advance(context.SourceReadOffset.X * bitCount);
if (canDoFastPath)
{
// Fast path for bits >= 16
for (int col = 0; col < cols; col++)
{
uint value = bitReader.Read(bitCount);
value = FastExpandBits(value, bitCount, 32);
pixelSpan[col] = new TiffGray16((ushort)(~value >> 16));
}
}
else
{
// Slow path
for (int col = 0; col < cols; col++)
{
uint value = bitReader.Read(bitCount);
value = (uint)ExpandBits(value, bitCount, 32, reverseEndianness);
pixelSpan[col] = new TiffGray16((ushort)(~value >> 16));
}
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (!_isAlphaAssociated)
{
ProcessUnassociated(context);
}
else if (_undoColorPreMultiplying)
{
ProcessAssociatedWithUndoColorPreMultiplying(context);
}
else
{
ProcessAssociatedPreservingColorPreMultiplying(context);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bytesPerScanline = 4 * context.SourceImageSize.Width;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffCmyk32> writer = context.GetWriter <TiffCmyk32>();
int rows = context.ReadSize.Height;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffCmyk32> pixelSpanHandle = writer.GetRowSpan(row);
Span <byte> rowDestinationSpan = MemoryMarshal.AsBytes(pixelSpanHandle.GetSpan());
sourceSpan.Slice(4 * context.SourceReadOffset.X, 4 * context.ReadSize.Width).CopyTo(rowDestinationSpan);
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
TiffYCbCrConverter8 converter = _converter;
int bytesPerScanline = 3 * context.SourceImageSize.Width;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffRgba32> writer = context.GetWriter <TiffRgba32>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba32> pixelSpanHandle = writer.GetRowSpan(row);
ReadOnlySpan <byte> rowSourceSpan = sourceSpan.Slice(3 * context.SourceReadOffset.X, 3 * context.ReadSize.Width);
Span <TiffRgba32> rowDestinationSpan = pixelSpanHandle.GetSpan();
converter.ConvertToRgba32(rowSourceSpan, rowDestinationSpan, cols);
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
TiffYCbCrConverter16 converter = _converter;
int skippedRowOffset = context.SourceImageSize.Width * context.SourceReadOffset.Y;
int planarByteCount = sizeof(ushort) * context.SourceImageSize.Width * context.SourceImageSize.Height;
ReadOnlySpan <byte> sourceSpan = context.UncompressedData.Span;
ReadOnlySpan <ushort> sourceY = MemoryMarshal.Cast <byte, ushort>(sourceSpan.Slice(0, planarByteCount));
ReadOnlySpan <ushort> sourceCb = MemoryMarshal.Cast <byte, ushort>(sourceSpan.Slice(planarByteCount, planarByteCount));
ReadOnlySpan <ushort> sourceCr = MemoryMarshal.Cast <byte, ushort>(sourceSpan.Slice(2 * planarByteCount, planarByteCount));
using TiffPixelBufferWriter <TiffRgba64> writer = context.GetWriter <TiffRgba64>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
bool reverseEndiannessNeeded = context.IsLittleEndian != BitConverter.IsLittleEndian;
if (reverseEndiannessNeeded)
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba64> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffRgba64> rowDestinationSpan = pixelSpanHandle.GetSpan();
int rowOffset = skippedRowOffset + row * context.SourceImageSize.Width + context.SourceReadOffset.X;
for (int col = 0; col < cols; col++)
{
int componentOffset = rowOffset + col;
rowDestinationSpan[col] = converter.ConvertToRgba64(BinaryPrimitives.ReverseEndianness(sourceY[componentOffset]), BinaryPrimitives.ReverseEndianness(sourceCb[componentOffset]), BinaryPrimitives.ReverseEndianness(sourceCr[componentOffset]));
}
}
}
else
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba64> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffRgba64> rowDestinationSpan = pixelSpanHandle.GetSpan();
int rowOffset = skippedRowOffset + row * context.SourceImageSize.Width + context.SourceReadOffset.X;
for (int col = 0; col < cols; col++)
{
int componentOffset = rowOffset + col;
rowDestinationSpan[col] = converter.ConvertToRgba64(sourceY[componentOffset], sourceCb[componentOffset], sourceCr[componentOffset]);
}
}
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bitCount = _bitCount;
bool isHigherOrderBitsFirst = _fillOrder != TiffFillOrder.LowerOrderBitsFirst;
int bytesPerScanline = (context.SourceImageSize.Width * bitCount + 7) / 8;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffGray8> writer = context.GetWriter <TiffGray8>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffGray8> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffGray8> pixelSpan = pixelSpanHandle.GetSpan();
var bitReader = new BitReader(sourceSpan.Slice(0, bytesPerScanline), isHigherOrderBitsFirst);
bitReader.Advance(context.SourceReadOffset.X * bitCount);
if (bitCount * 2 >= 8)
{
// Fast path for bits >= 4
for (int col = 0; col < cols; col++)
{
uint value = bitReader.Read(bitCount);
value = FastExpandBits(value, bitCount, 8);
pixelSpan[col] = new TiffGray8((byte)value);
}
}
else
{
// Slow path
for (int col = 0; col < cols; col++)
{
uint value = bitReader.Read(bitCount);
value = ExpandBits(value, bitCount, 8);
pixelSpan[col] = new TiffGray8((byte)value);
}
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
TiffYCbCrConverter16 converter = _converter;
int elementsPerScanline = 3 * context.SourceImageSize.Width;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * elementsPerScanline * sizeof(ushort));
Span <ushort> sourceSpan = MemoryMarshal.Cast <byte, ushort>(source.Span);
using TiffPixelBufferWriter <TiffRgba64> writer = context.GetWriter <TiffRgba64>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
bool reverseEndiannessNeeded = context.IsLittleEndian != BitConverter.IsLittleEndian;
if (reverseEndiannessNeeded)
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba64> pixelSpanHandle = writer.GetRowSpan(row);
Span <ushort> rowSourceSpan = sourceSpan.Slice(3 * context.SourceReadOffset.X, 3 * context.ReadSize.Width);
Span <TiffRgba64> rowDestinationSpan = pixelSpanHandle.GetSpan();
for (int i = 0; i < rowSourceSpan.Length; i++)
{
rowSourceSpan[i] = BinaryPrimitives.ReverseEndianness(rowSourceSpan[i]);
}
converter.ConvertToRgba64(rowSourceSpan, rowDestinationSpan, cols);
sourceSpan = sourceSpan.Slice(elementsPerScanline);
}
}
else
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba64> pixelSpanHandle = writer.GetRowSpan(row);
Span <ushort> rowSourceSpan = sourceSpan.Slice(3 * context.SourceReadOffset.X, 3 * context.ReadSize.Width);
Span <TiffRgba64> rowDestinationSpan = pixelSpanHandle.GetSpan();
converter.ConvertToRgba64(rowSourceSpan, rowDestinationSpan, cols);
sourceSpan = sourceSpan.Slice(elementsPerScanline);
}
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bytesPerScanline = 8 * context.SourceImageSize.Width;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <TiffCmyk64> cmykSourceSpan = MemoryMarshal.Cast <byte, TiffCmyk64>(source.Span);
using TiffPixelBufferWriter <TiffCmyk64> writer = context.GetWriter <TiffCmyk64>();
int rows = context.ReadSize.Height;
if (context.IsLittleEndian == BitConverter.IsLittleEndian)
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffCmyk64> pixelSpanHandle = writer.GetRowSpan(row);
cmykSourceSpan.Slice(context.SourceReadOffset.X, context.ReadSize.Width).CopyTo(pixelSpanHandle.GetSpan());
cmykSourceSpan = cmykSourceSpan.Slice(context.SourceImageSize.Width);
}
}
else
{
int cols = context.ReadSize.Width;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffCmyk64> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffCmyk64> rowDestinationSpan = pixelSpanHandle.GetSpan();
for (int col = 0; col < cols; col++)
{
TiffCmyk64 cmyk = cmykSourceSpan[col];
cmyk.C = BinaryPrimitives.ReverseEndianness(cmyk.C);
cmyk.M = BinaryPrimitives.ReverseEndianness(cmyk.M);
cmyk.Y = BinaryPrimitives.ReverseEndianness(cmyk.Y);
cmyk.K = BinaryPrimitives.ReverseEndianness(cmyk.K);
rowDestinationSpan[col] = cmyk;
}
cmykSourceSpan = cmykSourceSpan.Slice(context.SourceImageSize.Width);
}
}
return(next.RunAsync(context));
}
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
TiffParallelDecodingState?state = context.GetService(typeof(TiffParallelDecodingState)) as TiffParallelDecodingState;
if (state is null)
{
return(next.RunAsync(context));
}
return(new ValueTask(state.DispatchAsync(() => next.RunAsync(context), context.CancellationToken)));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
// Colormap array is read using TiffTagReader, its elements should be in machine-endian.
ushort[] colorMap = _colorMap;
int bitCount = _bitCount;
bool isHigherOrderBitsFirst = _fillOrder != TiffFillOrder.LowerOrderBitsFirst;
int bytesPerScanline = (context.SourceImageSize.Width * bitCount + 7) / 8;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffRgba64> writer = context.GetWriter <TiffRgba64>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
TiffRgba64 pixel = default;
pixel.A = ushort.MaxValue;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba64> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffRgba64> pixelSpan = pixelSpanHandle.GetSpan();
var bitReader = new BitReader(sourceSpan.Slice(0, bytesPerScanline), isHigherOrderBitsFirst);
bitReader.Advance(context.SourceReadOffset.X * bitCount);
for (int col = 0; col < cols; col++)
{
uint offset = bitReader.Read(bitCount);
pixel.R = colorMap[offset];
pixel.G = colorMap[SingleColorCount + offset];
pixel.B = colorMap[2 * SingleColorCount + offset];
pixelSpan[col] = pixel;
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
// Colormap array is read using TiffTagReader, its elements should be in machine-endian.
ushort[] colorMap = _colorMap;
int bytesPerScanline = context.SourceImageSize.Width;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffRgba64> writer = context.GetWriter <TiffRgba64>();
int rows = context.ReadSize.Height;
TiffRgba64 pixel = default;
pixel.A = ushort.MaxValue;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba64> pixelSpanHandle = writer.GetRowSpan(row);
ReadOnlySpan <byte> rowSourceSpan = sourceSpan.Slice(context.SourceReadOffset.X, context.ReadSize.Width);
Span <TiffRgba64> rowDestinationSpan = pixelSpanHandle.GetSpan();
for (int i = 0; i < rowSourceSpan.Length; i++)
{
int offset = rowSourceSpan[i];
pixel.R = colorMap[offset];
pixel.G = colorMap[SingleColorCount + offset];
pixel.B = colorMap[2 * SingleColorCount + offset];
rowDestinationSpan[i] = pixel;
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bytesPerScanline = context.SourceImageSize.Width * 2;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffGray16> writer = context.GetWriter <TiffGray16>();
bool reverseEndiannessNeeded = context.IsLittleEndian != BitConverter.IsLittleEndian;
int rows = context.ReadSize.Height;
if (reverseEndiannessNeeded)
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffGray16> pixelSpanHandle = writer.GetRowSpan(row);
ReadOnlySpan <ushort> scanline = MemoryMarshal.Cast <byte, ushort>(sourceSpan).Slice(context.SourceReadOffset.X, context.ReadSize.Width);
Span <ushort> destination16 = MemoryMarshal.Cast <TiffGray16, ushort>(pixelSpanHandle.GetSpan());
for (int i = 0; i < scanline.Length; i++)
{
destination16[i] = BinaryPrimitives.ReverseEndianness(scanline[i]);
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
}
else
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffGray16> pixelSpanHandle = writer.GetRowSpan(row);
Span <byte> rowDestinationSpan = MemoryMarshal.AsBytes(pixelSpanHandle.GetSpan());
sourceSpan.Slice(sizeof(ushort) * context.SourceReadOffset.X, sizeof(ushort) * context.ReadSize.Width).CopyTo(rowDestinationSpan);
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (_predictor == TiffPredictor.None)
{
return(next.RunAsync(context));
}
if (_predictor != TiffPredictor.HorizontalDifferencing)
{
throw new NotSupportedException("Predictor not supportted.");
}
int skipped = 0;
bool isMultiplePlanar = _bytesPerScanlines.Count > 1;
for (int planarIndex = 0; planarIndex < _bytesPerScanlines.Count; planarIndex++)
{
int bytesPerScanline = _bytesPerScanlines[planarIndex];
// Current plane buffer
Span <byte> plane = context.UncompressedData.Span.Slice(skipped, bytesPerScanline * context.SourceImageSize.Height);
// Skip scanlines that are not to be decoded
plane = plane.Slice(bytesPerScanline * context.SourceReadOffset.Y);
TiffValueCollection <ushort> bitsPerSample = isMultiplePlanar ? TiffValueCollection.Single(_bitsPerSample[planarIndex]) : _bitsPerSample;
for (int row = 0; row < context.ReadSize.Height; row++)
{
// Process every scanline
Span <byte> scanline = plane.Slice(row * bytesPerScanline, bytesPerScanline);
UndoHorizontalDifferencingForScanline(scanline, bitsPerSample, context.SourceImageSize.Width);
}
skipped += bytesPerScanline * context.SourceImageSize.Height;
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (_orientation == 0 || _orientation == TiffOrientation.TopLeft)
{
return(next.RunAsync(context));
}
return(next.RunAsync(new TiffOrientatedImageDecoderContext(context, _orientation)));
}
public async ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
using var state = new TiffParallelDecodingState(_maxDegreeOfParallelism);
using var mutexService = new ParallelMutexService();
context.RegisterService(typeof(TiffParallelDecodingState), state);
context.RegisterService(typeof(ITiffParallelMutexService), mutexService);
state.LockTaskCompletion();
await next.RunAsync(context).ConfigureAwait(false);
state.ReleaseTaskCompletion();
await state.Complete !.Task.ConfigureAwait(false);
context.RegisterService(typeof(TiffParallelDecodingState), null);
context.RegisterService(typeof(ITiffParallelMutexService), null);
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int skippedRowOffset = context.SourceImageSize.Width * context.SourceReadOffset.Y;
int planarByteCount = context.SourceImageSize.Width * context.SourceImageSize.Height;
ReadOnlySpan <byte> sourceSpan = context.UncompressedData.Span;
ReadOnlySpan <byte> sourceC = sourceSpan.Slice(0, planarByteCount);
ReadOnlySpan <byte> sourceM = sourceSpan.Slice(planarByteCount, planarByteCount);
ReadOnlySpan <byte> sourceY = sourceSpan.Slice(2 * planarByteCount, planarByteCount);
ReadOnlySpan <byte> sourceK = sourceSpan.Slice(3 * planarByteCount, planarByteCount);
using TiffPixelBufferWriter <TiffCmyk32> writer = context.GetWriter <TiffCmyk32>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffCmyk32> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffCmyk32> rowDestinationSpan = pixelSpanHandle.GetSpan();
int rowOffset = skippedRowOffset + row * context.SourceImageSize.Width + context.SourceReadOffset.X;
for (int col = 0; col < cols; col++)
{
int componentOffset = rowOffset + col;
rowDestinationSpan[col] = new TiffCmyk32(sourceC[componentOffset], sourceM[componentOffset], sourceY[componentOffset], sourceK[componentOffset]);
}
}
return(next.RunAsync(context));
}
public async ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
IDisposable?lockObj = null;
var mutexService = context.GetService(typeof(ITiffParallelMutexService)) as ITiffParallelMutexService;
if (!(mutexService is null))
{
lockObj = await mutexService.LockAsync(context.CancellationToken).ConfigureAwait(false);
}
try
{
await next.RunAsync(context).ConfigureAwait(false);
}
finally
{
if (!(lockObj is null))
{
lockObj.Dispose();
}
}
}
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bitCount = _bitCount;
Span <ushort> uncompressedData = MemoryMarshal.Cast <byte, ushort>(context.UncompressedData.Span);
for (int i = 0; i < uncompressedData.Length; i++)
{
uncompressedData[i] = (ushort)FastExpandBits(uncompressedData[i], bitCount);
}
return(next.RunAsync(new JpegDataEndianContextWrapper(context)));
}
/// <inheritdoc />
public async ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (context.ContentReader is null)
{
throw new ArgumentException("ContentReader is not provided in the TiffImageDecoderContext instance.");
}
if (context.OperationContext is null)
{
throw new ArgumentException("OperationContext is not provided in the TiffImageDecoderContext instance.");
}
bool isParallel = !(context.GetService(typeof(TiffParallelDecodingState)) is null);
// Initialize the cache
TiffFieldReader? reader = null;
TiffStrileOffsetCache cache;
if (_lazyLoad)
{
reader = new TiffFieldReader(context.ContentReader, context.OperationContext, leaveOpen: true);
cache = new TiffStrileOffsetCache(reader, _stripOffsetsEntry, _stripsByteCountEntry, CacheSize);
}
else
{
cache = new TiffStrileOffsetCache(_stripOffsets, _stripsByteCount);
}
try
{
int rowsPerStrip = _rowsPerStrip;
CancellationToken cancellationToken = context.CancellationToken;
// Special case for mailformed file.
if (rowsPerStrip <= 0 && _stripCount == 1)
{
rowsPerStrip = context.SourceImageSize.Height;
}
// Make sure the region to read is in the image boundary.
if (context.SourceReadOffset.X >= context.SourceImageSize.Width || context.SourceReadOffset.Y >= context.SourceImageSize.Height)
{
return;
}
context.ReadSize = new TiffSize(Math.Min(context.ReadSize.Width, context.SourceImageSize.Width - context.SourceReadOffset.X), Math.Min(context.ReadSize.Height, context.SourceImageSize.Height - context.SourceReadOffset.Y));
if (context.ReadSize.IsAreaEmpty)
{
return;
}
// Create a wrapped context
int planeCount = _planeCount;
TiffImageEnumeratorDecoderContext? wrapperContext = null;
TiffMutableValueCollection <TiffStreamRegion> planarRegions = default;
if (!isParallel)
{
wrapperContext = new TiffImageEnumeratorDecoderContext(context);
planarRegions = new TiffMutableValueCollection <TiffStreamRegion>(planeCount);
}
// loop through all the strips overlapping with the region to read
int stripStart = context.SourceReadOffset.Y / rowsPerStrip;
int stripEnd = (context.SourceReadOffset.Y + context.ReadSize.Height + rowsPerStrip - 1) / rowsPerStrip;
int actualStripCount = _stripCount / _planeCount;
for (int stripIndex = stripStart; stripIndex < stripEnd; stripIndex++)
{
if (isParallel)
{
wrapperContext = new TiffImageEnumeratorDecoderContext(context);
planarRegions = new TiffMutableValueCollection <TiffStreamRegion>(planeCount);
}
// Calculate size info of this strip
int currentYOffset = stripIndex * rowsPerStrip;
int stripImageHeight = Math.Min(rowsPerStrip, context.SourceImageSize.Height - currentYOffset);
int skippedScanlines = Math.Max(0, context.SourceReadOffset.Y - currentYOffset);
int requestedScanlines = Math.Min(stripImageHeight - skippedScanlines, context.SourceReadOffset.Y + context.ReadSize.Height - currentYOffset - skippedScanlines);
wrapperContext !.SourceImageSize = new TiffSize(context.SourceImageSize.Width, stripImageHeight);
wrapperContext.SourceReadOffset = new TiffPoint(context.SourceReadOffset.X, skippedScanlines);
wrapperContext.ReadSize = new TiffSize(context.ReadSize.Width, requestedScanlines);
// Update size info of the destination buffer
wrapperContext.SetCropSize(new TiffPoint(0, Math.Max(0, currentYOffset - context.SourceReadOffset.Y)), context.ReadSize);
// Check to see if there is any region area to be read
if (wrapperContext.ReadSize.IsAreaEmpty)
{
continue;
}
// Prepare stream regions of this strip
for (int planarIndex = 0; planarIndex < planeCount; planarIndex++)
{
int accessIndex = planarIndex * actualStripCount + stripIndex;
planarRegions[planarIndex] = await cache.GetOffsetAndCountAsync(accessIndex, cancellationToken).ConfigureAwait(false);
}
wrapperContext.PlanarRegions = planarRegions.GetReadOnlyView();
cancellationToken.ThrowIfCancellationRequested();
// Pass down the data
await next.RunAsync(wrapperContext).ConfigureAwait(false);
}
}
finally
{
((IDisposable)cache).Dispose();
reader?.Dispose();
}
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
Span <ushort> bitsPerSample = stackalloc ushort[3];
_bitsPerSample.CopyTo(bitsPerSample);
bool isHigherOrderBitsFirst = _fillOrder != TiffFillOrder.LowerOrderBitsFirst;
int totalBitsPerSample = bitsPerSample[0] + bitsPerSample[1] + bitsPerSample[2];
int bytesPerScanline = (context.SourceImageSize.Width * totalBitsPerSample + 7) / 8;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffRgba64> writer = context.GetWriter <TiffRgba64>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
// BitReader.Read reads bytes in big-endian way, we only need to reverse the endianness if the source is little-endian.
bool isLittleEndian = context.IsLittleEndian;
bool reverseEndiannessR = isLittleEndian && bitsPerSample[0] % 8 == 0;
bool reverseEndiannessG = isLittleEndian && bitsPerSample[1] % 8 == 0;
bool reverseEndiannessB = isLittleEndian && bitsPerSample[2] % 8 == 0;
bool canDoFastPath = bitsPerSample[0] >= 16 && bitsPerSample[1] >= 16 && bitsPerSample[2] >= 16 &&
!reverseEndiannessR & !reverseEndiannessG & !reverseEndiannessB;
TiffRgba64 pixel = default;
pixel.A = ushort.MaxValue;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgba64> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffRgba64> pixelSpan = pixelSpanHandle.GetSpan();
var bitReader = new BitReader(sourceSpan.Slice(0, bytesPerScanline), isHigherOrderBitsFirst);
bitReader.Advance(context.SourceReadOffset.X * totalBitsPerSample);
if (canDoFastPath)
{
// Fast path for bits >= 8
for (int col = 0; col < cols; col++)
{
pixel.R = (ushort)(FastExpandBits(bitReader.Read(bitsPerSample[0]), bitsPerSample[0], 32) >> 16);
pixel.G = (ushort)(FastExpandBits(bitReader.Read(bitsPerSample[1]), bitsPerSample[1], 32) >> 16);
pixel.B = (ushort)(FastExpandBits(bitReader.Read(bitsPerSample[2]), bitsPerSample[2], 32) >> 16);
pixelSpan[col] = pixel;
}
}
else
{
// Slow path
for (int col = 0; col < cols; col++)
{
pixel.R = (ushort)(ExpandBits(bitReader.Read(bitsPerSample[0]), bitsPerSample[0], 32, reverseEndiannessR) >> 16);
pixel.G = (ushort)(ExpandBits(bitReader.Read(bitsPerSample[1]), bitsPerSample[1], 32, reverseEndiannessG) >> 16);
pixel.B = (ushort)(ExpandBits(bitReader.Read(bitsPerSample[2]), bitsPerSample[2], 32, reverseEndiannessB) >> 16);
pixelSpan[col] = pixel;
}
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
public async ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
MemoryPool <byte> memoryPool = context.MemoryPool ?? MemoryPool <byte> .Shared;
TiffFileContentReader contentReader = context.ContentReader ?? throw new InvalidOperationException();
IMemoryOwner <byte>?dataHandle = null;
Memory <byte> data;
try
{
const int BufferSize = 65536;
using (var bufferWriter = new MemoryPoolBufferWriter(memoryPool))
{
// Read JPEG stream
TiffStreamRegion streamRegion = _streamRegion;
do
{
int readSize = Math.Min(streamRegion.Length, BufferSize);
Memory <byte> memory = bufferWriter.GetMemory(readSize);
memory = memory.Slice(0, Math.Min(streamRegion.Length, memory.Length));
readSize = await contentReader.ReadAsync(streamRegion.Offset, memory, context.CancellationToken).ConfigureAwait(false);
bufferWriter.Advance(readSize);
streamRegion = new TiffStreamRegion(streamRegion.Offset + readSize, streamRegion.Length - readSize);
} while (streamRegion.Length > 0);
// Identify the image
var decoder = new JpegDecoder();
decoder.MemoryPool = memoryPool;
decoder.SetInput(bufferWriter.GetReadOnlySequence());
decoder.Identify();
if (decoder.Width != context.SourceImageSize.Width || decoder.Height != context.SourceImageSize.Height)
{
throw new InvalidOperationException("The image size does not match.");
}
if (decoder.Precision != 8)
{
throw new InvalidOperationException("Only 8-bit JPEG is supported.");
}
// Adjust buffer size and reading region to reduce buffer size
int skippedWidth = context.SourceReadOffset.X / 8 * 8;
int skippedHeight = context.SourceReadOffset.Y / 8 * 8;
context.SourceReadOffset = new TiffPoint(context.SourceReadOffset.X % 8, context.SourceReadOffset.Y % 8);
int bufferWidth = context.SourceReadOffset.X + context.ReadSize.Width;
int bufferHeight = context.SourceReadOffset.Y + context.ReadSize.Height;
context.SourceImageSize = new TiffSize(bufferWidth, bufferHeight);
// Allocate buffer and decode image
int dataSize = bufferWidth * bufferHeight * decoder.NumberOfComponents;
dataHandle = memoryPool.Rent(dataSize);
data = dataHandle.Memory.Slice(0, dataSize);
decoder.SetOutputWriter(new LegacyJpegBufferOutputWriter(skippedWidth, bufferWidth, skippedHeight, bufferHeight, decoder.NumberOfComponents, data));
decoder.Decode();
}
// Pass the buffer to the next middleware
context.UncompressedData = data;
await next.RunAsync(context).ConfigureAwait(false);
context.UncompressedData = null;
}
finally
{
dataHandle?.Dispose();
}
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bytesPerScanline = (context.SourceImageSize.Width + 7) / 8;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffGray8> writer = context.GetWriter <TiffGray8>();
int xOffset = context.SourceReadOffset.X;
int rows = context.ReadSize.Height;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffGray8> pixelSpanHandle = writer.GetRowSpan(row);
ReadOnlySpan <byte> bitsSpan = sourceSpan.Slice(xOffset >> 3); // xOffset / 8
Span <byte> rowDestinationSpan = MemoryMarshal.AsBytes(pixelSpanHandle.GetSpan());
int bitsOffset = xOffset & 7; // xOffset % 8
int sourceIndex = 0;
int destinationIndex = 0;
int remainingWidth = context.ReadSize.Width;
byte bits;
if (bitsOffset > 0)
{
remainingWidth -= 8 - bitsOffset;
bits = MaybeReverseBits(bitsSpan[sourceIndex++]);
for (; bitsOffset < 8; bitsOffset++)
{
bool isSet = (bits >> (7 - bitsOffset) & 1) != 0;
rowDestinationSpan[destinationIndex++] = isSet ? (byte)0 : (byte)255;
}
}
while (remainingWidth >= 8)
{
bits = (bitsSpan[sourceIndex++]);
bool bit0 = (bits >> 7 & 1) != 0;
bool bit1 = (bits >> 6 & 1) != 0;
bool bit2 = (bits >> 5 & 1) != 0;
bool bit3 = (bits >> 4 & 1) != 0;
bool bit4 = (bits >> 3 & 1) != 0;
bool bit5 = (bits >> 2 & 1) != 0;
bool bit6 = (bits >> 1 & 1) != 0;
bool bit7 = (bits & 1) != 0;
rowDestinationSpan[destinationIndex++] = bit0 ? (byte)0 : (byte)255;
rowDestinationSpan[destinationIndex++] = bit1 ? (byte)0 : (byte)255;
rowDestinationSpan[destinationIndex++] = bit2 ? (byte)0 : (byte)255;
rowDestinationSpan[destinationIndex++] = bit3 ? (byte)0 : (byte)255;
rowDestinationSpan[destinationIndex++] = bit4 ? (byte)0 : (byte)255;
rowDestinationSpan[destinationIndex++] = bit5 ? (byte)0 : (byte)255;
rowDestinationSpan[destinationIndex++] = bit6 ? (byte)0 : (byte)255;
rowDestinationSpan[destinationIndex++] = bit7 ? (byte)0 : (byte)255;
remainingWidth -= 8;
}
if (remainingWidth > 0)
{
bits = MaybeReverseBits(bitsSpan[sourceIndex++]);
for (; remainingWidth > 0; remainingWidth--)
{
bool isSet = (bits & 0b10000000) != 0;
rowDestinationSpan[destinationIndex++] = isSet ? (byte)0 : (byte)255;
bits = (byte)(bits << 1);
}
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public async ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (context.ContentReader is null)
{
throw new ArgumentException("ContentReader is not provided in the TiffImageDecoderContext instance.");
}
if (context.OperationContext is null)
{
throw new ArgumentException("OperationContext is not provided in the TiffImageDecoderContext instance.");
}
bool isParallel = !(context.GetService(typeof(TiffParallelDecodingState)) is null);
// Initialize the cache
TiffFieldReader? reader = null;
TiffStrileOffsetCache cache;
if (_lazyLoad)
{
reader = new TiffFieldReader(context.ContentReader, context.OperationContext, leaveOpen: true);
cache = new TiffStrileOffsetCache(reader, _tileOffsetsEntry, _tileByteCountsEntry, CacheSize);
}
else
{
cache = new TiffStrileOffsetCache(_tileOffsets, _tileByteCounts);
}
int tileWidth = _tileWidth;
int tileHeight = _tileHeight;
try
{
int tileAcross = (context.SourceImageSize.Width + tileWidth - 1) / tileWidth;
int tileDown = (context.SourceImageSize.Height + tileHeight - 1) / tileHeight;
int tileCount = tileAcross * tileDown;
CancellationToken cancellationToken = context.CancellationToken;
// Make sure the region to read is in the image boundary.
if (context.SourceReadOffset.X >= context.SourceImageSize.Width || context.SourceReadOffset.Y >= context.SourceImageSize.Height)
{
return;
}
context.ReadSize = new TiffSize(Math.Min(context.ReadSize.Width, context.SourceImageSize.Width - context.SourceReadOffset.X), Math.Min(context.ReadSize.Height, context.SourceImageSize.Height - context.SourceReadOffset.Y));
if (context.ReadSize.IsAreaEmpty)
{
return;
}
int planeCount = _planaCount;
TiffImageEnumeratorDecoderContext? wrapperContext = null;
TiffMutableValueCollection <TiffStreamRegion> planarRegions = default;
if (!isParallel)
{
wrapperContext = new TiffImageEnumeratorDecoderContext(context);
planarRegions = new TiffMutableValueCollection <TiffStreamRegion>(planeCount);
}
// loop through all the tiles overlapping with the region to read.
int colStart = context.SourceReadOffset.X / tileWidth;
int colEnd = (context.SourceReadOffset.X + context.ReadSize.Width + tileWidth - 1) / tileWidth;
int rowStart = context.SourceReadOffset.Y / tileHeight;
int rowEnd = (context.SourceReadOffset.Y + context.ReadSize.Height + tileHeight - 1) / tileHeight;
for (int row = rowStart; row < rowEnd; row++)
{
// Calculate coordinates on the y direction for the tiles on this row.
int currentYOffset = row * tileHeight;
int skippedScanlines = Math.Max(0, context.SourceReadOffset.Y - currentYOffset);
int requestedScanlines = Math.Min(tileHeight - skippedScanlines, context.SourceReadOffset.Y + context.ReadSize.Height - currentYOffset - skippedScanlines);
for (int col = colStart; col < colEnd; col++)
{
if (isParallel)
{
wrapperContext = new TiffImageEnumeratorDecoderContext(context);
planarRegions = new TiffMutableValueCollection <TiffStreamRegion>(planeCount);
}
wrapperContext !.SourceImageSize = new TiffSize(tileWidth, tileHeight);
// Calculate coordinates on the y direction for this tile.
int currentXOffset = col * tileWidth;
int skippedXOffset = Math.Max(0, context.SourceReadOffset.X - currentXOffset);
int requestedWidth = Math.Min(tileWidth - skippedXOffset, context.SourceReadOffset.X + context.ReadSize.Width - currentXOffset - skippedXOffset);
// Update size info of this tile
wrapperContext.SourceReadOffset = new TiffPoint(skippedXOffset, skippedScanlines);
wrapperContext.ReadSize = new TiffSize(requestedWidth, requestedScanlines);
// Update size info of the destination buffer
wrapperContext.SetCropSize(new TiffPoint(Math.Max(0, currentXOffset - context.SourceReadOffset.X), Math.Max(0, currentYOffset - context.SourceReadOffset.Y)), context.ReadSize);
// Check to see if there is any region area to be read
if (wrapperContext.ReadSize.IsAreaEmpty)
{
continue;
}
// Prepare stream regions of this tile
for (int planarIndex = 0; planarIndex < planeCount; planarIndex++)
{
int tileIndex = planarIndex * tileCount + row * tileAcross + col;
planarRegions[planarIndex] = await cache.GetOffsetAndCountAsync(tileIndex, cancellationToken).ConfigureAwait(false);
}
wrapperContext.PlanarRegions = planarRegions.GetReadOnlyView();
cancellationToken.ThrowIfCancellationRequested();
// Pass down the data
await next.RunAsync(wrapperContext).ConfigureAwait(false);
}
}
}
finally
{
((IDisposable)cache).Dispose();
reader?.Dispose();
}
}
/// <inheritdoc />
public async ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (_bytesPerScanlines.Count != context.PlanarRegions.Count)
{
throw new InvalidOperationException();
}
int planeCount = _bytesPerScanlines.Count;
// calculate the uncompressed data buffer length
int uncompressedDataLength = 0;
int imageHeight = context.SourceImageSize.Height;
foreach (int bytesPerScanline in _bytesPerScanlines)
{
uncompressedDataLength += bytesPerScanline * imageHeight;
}
TiffEmptyStrileWriter?emptyWriter = null;
// calculate the maximum buffer needed to read from stream
int readCount = 0;
foreach (TiffStreamRegion planarRegion in context.PlanarRegions)
{
int length = planarRegion.Length;
if (length == 0)
{
emptyWriter = new TiffEmptyStrileWriter(new TiffRgba32(255, 255, 255, 0));
break;
}
if (length > readCount)
{
readCount = planarRegion.Length;
}
}
if (!(emptyWriter is null))
{
emptyWriter.Write(context);
return;
}
// allocate the raw data buffer and the uncompressed data buffer
MemoryPool <byte> memoryPool = context.MemoryPool ?? MemoryPool <byte> .Shared;
using IMemoryOwner <byte> bufferMemory = memoryPool.Rent(uncompressedDataLength);
int planarUncompressedByteCount = 0;
TiffFileContentReader?reader = context.ContentReader;
if (reader is null)
{
throw new InvalidOperationException("Failed to acquire ContentReader.");
}
using (IMemoryOwner <byte> rawBuffer = memoryPool.Rent(readCount))
{
TiffDecompressionContext decompressionContext = new TiffDecompressionContext();
// decompress each plane
for (int i = 0; i < planeCount; i++)
{
TiffStreamRegion region = context.PlanarRegions[i];
// Read from stream
readCount = await reader.ReadAsync(region.Offset, rawBuffer.Memory.Slice(0, region.Length), context.CancellationToken).ConfigureAwait(false);
if (readCount != region.Length)
{
throw new InvalidDataException();
}
// Decompress this plane
int bytesPerScanline = _bytesPerScanlines[i];
decompressionContext.MemoryPool = memoryPool;
decompressionContext.PhotometricInterpretation = _photometricInterpretation;
decompressionContext.BitsPerSample = _bitsPerSample;
decompressionContext.ImageSize = context.SourceImageSize;
decompressionContext.BytesPerScanline = bytesPerScanline;
decompressionContext.SkippedScanlines = context.SourceReadOffset.Y;
decompressionContext.RequestedScanlines = context.ReadSize.Height;
_decompressionAlgorithm.Decompress(decompressionContext, rawBuffer.Memory.Slice(0, readCount), bufferMemory.Memory.Slice(planarUncompressedByteCount, bytesPerScanline * imageHeight));
planarUncompressedByteCount += bytesPerScanline * imageHeight;
}
}
// Pass down the data
context.UncompressedData = bufferMemory.Memory.Slice(0, uncompressedDataLength);
await next.RunAsync(context).ConfigureAwait(false);
context.UncompressedData = default;
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int skippedRowOffset = context.SourceImageSize.Width * context.SourceReadOffset.Y;
int planarByteCount = sizeof(ushort) * context.SourceImageSize.Width * context.SourceImageSize.Height;
ReadOnlySpan <byte> sourceSpan = context.UncompressedData.Span;
ReadOnlySpan <byte> sourceR = sourceSpan.Slice(0, planarByteCount);
ReadOnlySpan <byte> sourceG = sourceSpan.Slice(planarByteCount, planarByteCount);
ReadOnlySpan <byte> sourceB = sourceSpan.Slice(2 * planarByteCount, planarByteCount);
using TiffPixelBufferWriter <TiffBgra64> writer = context.GetWriter <TiffBgra64>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
if (context.IsLittleEndian == BitConverter.IsLittleEndian)
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffBgra64> pixelSpanHandle = writer.GetRowSpan(row);
Span <byte> rowDestinationSpan = MemoryMarshal.AsBytes(pixelSpanHandle.GetSpan());
int rowOffset = sizeof(ushort) * (skippedRowOffset + row * context.SourceImageSize.Width + context.SourceReadOffset.X);
for (int col = 0; col < cols; col++)
{
int componentOffset = rowOffset + sizeof(ushort) * col;
ulong value = 0xffff;
value = (value << 16) | (uint)(sourceR[componentOffset + 1] << 8) | sourceR[componentOffset]; // r
value = (value << 16) | (uint)(sourceG[componentOffset + 1] << 8) | sourceG[componentOffset]; // g
value = (value << 16) | (uint)(sourceB[componentOffset + 1] << 8) | sourceB[componentOffset]; // b
BinaryPrimitives.WriteUInt64LittleEndian(rowDestinationSpan, value);
rowDestinationSpan = rowDestinationSpan.Slice(8);
}
}
}
else
{
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffBgra64> pixelSpanHandle = writer.GetRowSpan(row);
Span <byte> rowDestinationSpan = MemoryMarshal.AsBytes(pixelSpanHandle.GetSpan());
int rowOffset = sizeof(ushort) * (skippedRowOffset + row * context.SourceImageSize.Width + context.SourceReadOffset.X);
for (int col = 0; col < cols; col++)
{
int componentOffset = rowOffset + sizeof(ushort) * col;
ulong value = 0xffff;
value = (value << 16) | (uint)(sourceR[componentOffset] << 8) | sourceR[componentOffset + 1]; // r
value = (value << 16) | (uint)(sourceG[componentOffset] << 8) | sourceG[componentOffset + 1]; // g
value = (value << 16) | (uint)(sourceB[componentOffset] << 8) | sourceB[componentOffset + 1]; // b
BinaryPrimitives.WriteUInt64LittleEndian(rowDestinationSpan, value);
rowDestinationSpan = rowDestinationSpan.Slice(8);
}
}
}
return(next.RunAsync(context));
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
Span <ushort> bitsPerSample = stackalloc ushort[3];
_bitsPerSample.CopyTo(bitsPerSample);
bool isHigherOrderBitsFirst = _fillOrder != TiffFillOrder.LowerOrderBitsFirst;
bool canDoFastPath = bitsPerSample[0] >= 4 && bitsPerSample[1] >= 4 && bitsPerSample[2] >= 4;
int totalBitsPerSample = bitsPerSample[0] + bitsPerSample[1] + bitsPerSample[2];
int bytesPerScanline = (context.SourceImageSize.Width * totalBitsPerSample + 7) / 8;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffRgb24> writer = context.GetWriter <TiffRgb24>();
int rows = context.ReadSize.Height;
int cols = context.ReadSize.Width;
TiffRgb24 pixel = default;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffRgb24> pixelSpanHandle = writer.GetRowSpan(row);
Span <TiffRgb24> pixelSpan = pixelSpanHandle.GetSpan();
var bitReader = new BitReader(sourceSpan.Slice(0, bytesPerScanline), isHigherOrderBitsFirst);
bitReader.Advance(context.SourceReadOffset.X * totalBitsPerSample);
if (canDoFastPath)
{
// Fast path for bits >= 8
for (int col = 0; col < cols; col++)
{
pixel.R = (byte)FastExpandBits(bitReader.Read(bitsPerSample[0]), bitsPerSample[0], 8);
pixel.G = (byte)FastExpandBits(bitReader.Read(bitsPerSample[1]), bitsPerSample[1], 8);
pixel.B = (byte)FastExpandBits(bitReader.Read(bitsPerSample[2]), bitsPerSample[2], 8);
pixelSpan[col] = pixel;
}
}
else
{
// Slow path
for (int col = 0; col < cols; col++)
{
pixel.R = (byte)ExpandBits(bitReader.Read(bitsPerSample[0]), bitsPerSample[0], 8);
pixel.G = (byte)ExpandBits(bitReader.Read(bitsPerSample[1]), bitsPerSample[1], 8);
pixel.B = (byte)ExpandBits(bitReader.Read(bitsPerSample[2]), bitsPerSample[2], 8);
pixelSpan[col] = pixel;
}
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
/// <summary>
/// Initialize the adapterwith the specified pipelines.
/// </summary>
/// <param name="parameters">Parameters of this TIFF file and IFD.</param>
/// <param name="pipeline">The pipeline to use for decoding the IFD.</param>
public TiffImageDecoderPipelineAdapter(TiffImageDecoderParameters parameters, ITiffImageDecoderPipelineNode pipeline)
{
_parameters = parameters ?? throw new ArgumentNullException(nameof(parameters));
_pipeline = pipeline ?? throw new ArgumentNullException(nameof(pipeline));
CalculateOrientedSize();
}
/// <inheritdoc />
public ValueTask InvokeAsync(TiffImageDecoderContext context, ITiffImageDecoderPipelineNode next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
int bytesPerScanline = (context.SourceImageSize.Width + 1) / 2;
Memory <byte> source = context.UncompressedData.Slice(context.SourceReadOffset.Y * bytesPerScanline);
ReadOnlySpan <byte> sourceSpan = source.Span;
using TiffPixelBufferWriter <TiffGray8> writer = context.GetWriter <TiffGray8>();
int xOffset = context.SourceReadOffset.X;
int rows = context.ReadSize.Height;
for (int row = 0; row < rows; row++)
{
using TiffPixelSpanHandle <TiffGray8> pixelSpanHandle = writer.GetRowSpan(row);
ReadOnlySpan <byte> bitsSpan = sourceSpan.Slice(xOffset >> 1); // xOffset / 2
Span <byte> rowDestinationSpan = MemoryMarshal.AsBytes(pixelSpanHandle.GetSpan());
int bitsOffset = xOffset & 1; // xOffset % 2
int sourceIndex = 0;
int destinationIndex = 0;
int remainingWidth = context.ReadSize.Width;
byte bits;
if (bitsOffset > 0)
{
remainingWidth--;
bits = bitsSpan[sourceIndex++];
bits = (byte)(bits & 0xf);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits);
}
// manual loop unrolling
for (; (remainingWidth >> 4) > 0; remainingWidth -= 16) // for (; remainingWidth >= 16; remainingWidth -= 16)
{
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
}
for (; (remainingWidth >> 1) > 0; remainingWidth -= 2) // for (; remainingWidth >= 2; remainingWidth -= 2)
{
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
rowDestinationSpan[destinationIndex++] = (byte)(bits << 4 | bits & 0xf);
}
if (remainingWidth != 0)
{
bits = bitsSpan[sourceIndex++];
rowDestinationSpan[destinationIndex++] = (byte)(bits & 0xf0 | bits >> 4);
}
sourceSpan = sourceSpan.Slice(bytesPerScanline);
}
return(next.RunAsync(context));
}
