/// <inheritdoc />
public void Compress(TiffCompressionContext context, ReadOnlyMemory <byte> input, IBufferWriter <byte> outputWriter)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("ThunderScan compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 8)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
context.BitsPerSample = TiffValueCollection.Single <ushort>(4);
Span <byte> buffer = stackalloc byte[4];
var encoder = new ThunderScanEncoder(outputWriter, buffer);
int height = context.ImageSize.Height;
int bytesPerScanline = context.BytesPerScanline;
ReadOnlySpan <byte> inputSpan = input.Span;
for (int row = 0; row < height; row++)
{
ReadOnlySpan <byte> run = inputSpan.Slice(0, bytesPerScanline);
inputSpan = inputSpan.Slice(bytesPerScanline);
encoder.Encode(run);
encoder.Reset();
}
}
public async ValueTask InvokeAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
MemoryPool <byte> memoryPool = context.MemoryPool ?? MemoryPool <byte> .Shared;
TiffSize imageSize = context.ImageSize;
int arraySize = imageSize.Width * imageSize.Height;
using (IMemoryOwner <byte> pixelData = memoryPool.Rent(arraySize))
{
using (var writer = new TiffMemoryPixelBufferWriter <TiffGray8>(memoryPool, pixelData.Memory, imageSize.Width, imageSize.Height))
using (TiffPixelBufferWriter <TPixel> convertedWriter = context.ConvertWriter(writer.AsPixelBufferWriter()))
{
await context.GetReader().ReadAsync(convertedWriter, context.CancellationToken).ConfigureAwait(false);
}
context.PhotometricInterpretation = TiffPhotometricInterpretation.BlackIsZero;
context.BitsPerSample = TiffValueCollection.Single <ushort>(8);
context.UncompressedData = pixelData.Memory.Slice(0, arraySize);
await next.RunAsync(context).ConfigureAwait(false);
context.UncompressedData = default;
}
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
using (await context.LockAsync().ConfigureAwait(false))
{
await ifdWriter.WriteTagAsync(TiffTag.PhotometricInterpretation, TiffValueCollection.Single((ushort)context.PhotometricInterpretation)).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.BitsPerSample, context.BitsPerSample).ConfigureAwait(false);
}
}
}
/// <inheritdoc />
public void Compress(TiffCompressionContext context, ReadOnlyMemory <byte> input, IBufferWriter <byte> outputWriter)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("Modified Huffman compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 8)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
context.BitsPerSample = TiffValueCollection.Single <ushort>(1);
ReadOnlySpan <byte> inputSpan = input.Span;
int width = context.ImageSize.Width;
int height = context.ImageSize.Height;
var bitWriter = new BitWriter2(outputWriter, 4096);
// Process every scanline
for (int row = 0; row < height; row++)
{
ReadOnlySpan <byte> rowSpan = inputSpan.Slice(0, width);
inputSpan = inputSpan.Slice(width);
CcittEncodingTable currentTable = CcittEncodingTable.WhiteInstance;
CcittEncodingTable otherTable = CcittEncodingTable.BlackInstance;
// ModifiedHuffman compression assumes WhiteIsZero photometric interpretation is used.
// Since the first run is white run, we look for black pixel in the first iteration.
byte nextRunPixel = 255;
while (!rowSpan.IsEmpty)
{
// Get the length of the current run
int runLength = rowSpan.IndexOf(nextRunPixel);
if (runLength < 0)
{
runLength = rowSpan.Length;
}
currentTable.EncodeRun(ref bitWriter, runLength);
rowSpan = rowSpan.Slice(runLength);
// Switch to the other color
CcittHelper.SwapTable(ref currentTable, ref otherTable);
nextRunPixel = (byte)~nextRunPixel;
}
bitWriter.AdvanceAlignByte();
}
bitWriter.Flush();
}
/// <summary>
/// Apply the predictor to <see cref="TiffImageEncoderContext{TPixel}.UncompressedData"/>, and runs the next middleware. Writes the <see cref="TiffTag.Predictor"/> tag to IFD writer.
/// </summary>
/// <param name="context">The encoder context.</param>
/// <param name="next">The next middleware.</param>
/// <returns>A <see cref="Task"/> that completes when the image has been encoded.</returns>
public async ValueTask InvokeAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (_predictor == TiffPredictor.None)
{
await next.RunAsync(context).ConfigureAwait(false);
return;
}
if (_predictor != TiffPredictor.HorizontalDifferencing)
{
throw new NotSupportedException("Predictor not supportted.");
}
TiffValueCollection <ushort> bitsPerSample = context.BitsPerSample;
int totalBits = 0;
for (int i = 0; i < bitsPerSample.Count; i++)
{
if (bitsPerSample[i] % 8 != 0)
{
throw new InvalidOperationException("Horizontal differencing predictor can not be applied to this image.");
}
totalBits += bitsPerSample[i];
}
Memory <byte> pixelData = context.UncompressedData;
int width = context.ImageSize.Width;
int bytesPerScanlines = (totalBits / 8) * width;
int height = context.ImageSize.Height;
for (int row = 0; row < height; row++)
{
ApplyHorizontalDifferencingForScanline(pixelData.Slice(row * bytesPerScanlines, bytesPerScanlines), bitsPerSample, width);
}
await next.RunAsync(context).ConfigureAwait(false);
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
using (await context.LockAsync().ConfigureAwait(false))
{
CancellationToken cancellationToken = context.CancellationToken;
await ifdWriter.WriteTagAsync(TiffTag.Predictor, TiffValueCollection.Single((ushort)_predictor), cancellationToken).ConfigureAwait(false);
}
}
}
private async ValueTask WrapContextAndRunAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
await next.RunAsync(new TiffOrientatedImageEncoderContext <TPixel>(context, _orientation)).ConfigureAwait(false);
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
using (await context.LockAsync().ConfigureAwait(false))
{
CancellationToken cancellationToken = context.CancellationToken;
await ifdWriter.WriteTagAsync(TiffTag.Orientation, TiffValueCollection.Single((ushort)_orientation), cancellationToken).ConfigureAwait(false);
}
}
}
/// <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));
}
public async ValueTask InvokeAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
MemoryPool <byte> memoryPool = context.MemoryPool ?? MemoryPool <byte> .Shared;
TiffSize imageSize = context.ImageSize;
int arraySize = 3 * imageSize.Width * imageSize.Height;
using (IMemoryOwner <byte> pixelData = memoryPool.Rent(arraySize))
{
Memory <byte> pixelDataMemory = pixelData.Memory;
using (var writer = new TiffMemoryPixelBufferWriter <TiffRgb24>(memoryPool, pixelDataMemory, imageSize.Width, imageSize.Height))
using (TiffPixelBufferWriter <TPixel> convertedWriter = context.ConvertWriter(writer.AsPixelBufferWriter()))
{
await context.GetReader().ReadAsync(convertedWriter, context.CancellationToken).ConfigureAwait(false);
}
TiffYCbCrConverter8.CreateDefault().ConvertFromRgb24(MemoryMarshal.Cast <byte, TiffRgb24>(pixelDataMemory.Span), pixelDataMemory.Span, imageSize.Width * imageSize.Height);
context.PhotometricInterpretation = TiffPhotometricInterpretation.YCbCr;
context.BitsPerSample = TiffValueCollection.UnsafeWrap(s_bitsPerSample);
context.UncompressedData = pixelDataMemory.Slice(0, arraySize);
await next.RunAsync(context).ConfigureAwait(false);
context.UncompressedData = default;
}
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
using (await context.LockAsync().ConfigureAwait(false))
{
await ifdWriter.WriteTagAsync(TiffTag.PhotometricInterpretation, TiffValueCollection.Single((ushort)context.PhotometricInterpretation)).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.BitsPerSample, context.BitsPerSample).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.SamplesPerPixel, TiffValueCollection.Single <ushort>(3)).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.YCbCrCoefficients, TiffYCbCrConverter8.DefaultLuma).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.ReferenceBlackWhite, TiffYCbCrConverter8.DefaultReferenceBlackWhite).ConfigureAwait(false);
}
}
}
/// <inheritdoc />
public void Compress(TiffCompressionContext context, ReadOnlyMemory <byte> input, IBufferWriter <byte> outputWriter)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("Modified Huffman compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 8)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
context.BitsPerSample = TiffValueCollection.Single <ushort>(1);
ReadOnlySpan <byte> inputSpan = input.Span;
int width = context.ImageSize.Width;
int height = context.ImageSize.Height;
var bitWriter = new BitWriter2(outputWriter, 4096);
ReferenceScanline referenceScanline = new ReferenceScanline(whiteIsZero: true, width);
// Process every scanline
for (int row = 0; row < height; row++)
{
ReadOnlySpan <byte> scanline = inputSpan.Slice(0, width);
inputSpan = inputSpan.Slice(width);
Encode2DScanline(ref bitWriter, referenceScanline, scanline);
referenceScanline = new ReferenceScanline(whiteIsZero: true, scanline);
}
bitWriter.Flush();
}
public async ValueTask InvokeAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
MemoryPool <byte> memoryPool = context.MemoryPool ?? MemoryPool <byte> .Shared;
TiffSize imageSize = context.ImageSize;
using (IMemoryOwner <byte> pixelData = memoryPool.Rent(imageSize.Width * imageSize.Height))
{
Memory <byte> pixelDataMemory = pixelData.Memory;
using (var writer = new TiffMemoryPixelBufferWriter <TiffMask>(memoryPool, pixelDataMemory, imageSize.Width, imageSize.Height))
using (TiffPixelBufferWriter <TPixel> convertedWriter = context.ConvertWriter(writer.AsPixelBufferWriter()))
{
await context.GetReader().ReadAsync(convertedWriter, context.CancellationToken).ConfigureAwait(false);
}
int count = PackBytesIntoBits(pixelDataMemory.Span, imageSize, _threshold);
context.PhotometricInterpretation = TiffPhotometricInterpretation.TransparencyMask;
context.BitsPerSample = TiffValueCollection.Single <ushort>(1);
context.UncompressedData = pixelData.Memory.Slice(0, count);
await next.RunAsync(context).ConfigureAwait(false);
context.UncompressedData = default;
}
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
using (await context.LockAsync().ConfigureAwait(false))
{
await ifdWriter.WriteTagAsync(TiffTag.PhotometricInterpretation, TiffValueCollection.Single((ushort)context.PhotometricInterpretation)).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.BitsPerSample, context.BitsPerSample).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.FillOrder, TiffValueCollection.Single((ushort)TiffFillOrder.HigherOrderBitsFirst)).ConfigureAwait(false);
}
}
}
/// <summary>
/// Crops the input image into tiles and runs the next middleware for each tile.
/// </summary>
/// <param name="context">The encoder context.</param>
/// <param name="next">The next middleware.</param>
/// <returns>A <see cref="Task"/> that completes when the image has been encoded.</returns>
public async ValueTask InvokeAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
var state = context.GetService(typeof(TiffParallelEncodingState)) as TiffParallelEncodingState;
TiffCroppedImageEncoderContext <TPixel>?wrappedContext = null;
int width = context.ImageSize.Width, height = context.ImageSize.Height;
int tileWidth = _tileSize.Width, tileHeight = _tileSize.Height;
int tileAcross = (width + tileWidth - 1) / tileWidth;
int tileDown = (height + tileHeight - 1) / tileHeight;
int tileCount = tileAcross * tileDown;
ulong[] tileOffsets = new ulong[tileCount];
ulong[] tileByteCounts = new ulong[tileCount];
int index = 0;
state?.LockTaskCompletion();
for (int row = 0; row < tileDown; row++)
{
int offsetY = row * tileHeight;
int imageHeight = Math.Min(height - offsetY, tileHeight);
for (int col = 0; col < tileAcross; col++)
{
int offsetX = col * tileWidth;
int imageWidth = Math.Min(width - offsetX, tileWidth);
wrappedContext ??= new TiffCroppedImageEncoderContext <TPixel>(context);
wrappedContext.ExposeIfdWriter = row == 0 && col == 0;
wrappedContext.OutputRegion = default;
wrappedContext.Crop(new TiffPoint(offsetX, offsetY), new TiffSize(imageWidth, imageHeight));
if (state is null)
{
await next.RunAsync(wrappedContext).ConfigureAwait(false);
tileOffsets[index] = (ulong)(long)wrappedContext.OutputRegion.Offset;
tileByteCounts[index] = (ulong)wrappedContext.OutputRegion.Length;
}
else
{
TiffCroppedImageEncoderContext <TPixel>?wContext = wrappedContext;
wrappedContext = null;
int currentIndex = index;
await state.DispatchAsync(async() =>
{
await next.RunAsync(wContext).ConfigureAwait(false);
tileOffsets[currentIndex] = (ulong)(long)wContext.OutputRegion.Offset;
tileByteCounts[currentIndex] = (ulong)wContext.OutputRegion.Length;
}, context.CancellationToken).ConfigureAwait(false);
}
index++;
}
}
// Wait until all tiles are written.
if (!(state is null))
{
state.ReleaseTaskCompletion();
await state.Complete.Task.ConfigureAwait(false);
}
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
using (await context.LockAsync().ConfigureAwait(false))
{
CancellationToken cancellationToken = context.CancellationToken;
await ifdWriter.WriteTagAsync(TiffTag.ImageWidth, TiffValueCollection.Single((uint)width), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.ImageLength, TiffValueCollection.Single((uint)height), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.TileWidth, TiffValueCollection.Single((ushort)tileWidth), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.TileLength, TiffValueCollection.Single((ushort)tileHeight), cancellationToken).ConfigureAwait(false);
if (context.FileWriter?.UseBigTiff ?? false)
{
await ifdWriter.WriteTagAsync(TiffTag.TileOffsets, TiffValueCollection.UnsafeWrap(tileOffsets), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.TileByteCounts, TiffValueCollection.UnsafeWrap(tileByteCounts), cancellationToken).ConfigureAwait(false);
}
else
{
uint[] tileOffsets32 = new uint[tileCount];
uint[] tileByteCounts32 = new uint[tileCount];
for (int i = 0; i < tileCount; i++)
{
tileOffsets32[i] = (uint)tileOffsets[i];
tileByteCounts32[i] = (uint)tileByteCounts[i];
}
await ifdWriter.WriteTagAsync(TiffTag.TileOffsets, TiffValueCollection.UnsafeWrap(tileOffsets32), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.TileByteCounts, TiffValueCollection.UnsafeWrap(tileByteCounts32), cancellationToken).ConfigureAwait(false);
}
}
}
}
/// <summary>
/// Apply compression to <see cref="TiffImageEncoderContext{TPixel}.UncompressedData"/> and writes the compressed image to <see cref="TiffImageEncoderContext{TPixel}.FileWriter"/>. Writes <see cref="TiffTag.Compression"/> to thhe IFD writer and runs the next middleware.
/// </summary>
/// <param name="context">The encoder context.</param>
/// <param name="next">The next middleware.</param>
/// <returns>A <see cref="Task"/> that completes when the image has been encoded.</returns>
public async ValueTask InvokeAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
if (context.FileWriter is null)
{
throw new InvalidOperationException("Failed to acquire FileWriter");
}
TiffValueCollection <ushort> bitsPerSample = context.BitsPerSample;
int totalBits = 0;
for (int i = 0; i < bitsPerSample.Count; i++)
{
totalBits += bitsPerSample[i];
}
int width = context.ImageSize.Width;
int bytesPerScanlines = (totalBits * width + 7) / 8;
var compressionContext = new TiffCompressionContext
{
MemoryPool = context.MemoryPool,
PhotometricInterpretation = context.PhotometricInterpretation,
ImageSize = context.ImageSize,
BitsPerSample = context.BitsPerSample,
BytesPerScanline = bytesPerScanlines
};
using (var bufferWriter = new MemoryPoolBufferWriter(context.MemoryPool))
{
_compressionAlgorithm.Compress(compressionContext, context.UncompressedData, bufferWriter);
int length = bufferWriter.Length;
using (await context.LockAsync().ConfigureAwait(false))
{
TiffStreamOffset offset = await context.FileWriter !.WriteAlignedBytesAsync(bufferWriter.GetReadOnlySequence(), context.CancellationToken).ConfigureAwait(false);
context.BitsPerSample = compressionContext.BitsPerSample;
context.OutputRegion = new TiffStreamRegion(offset, length);
}
}
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
using (await context.LockAsync().ConfigureAwait(false))
{
CancellationToken cancellationToken = context.CancellationToken;
await ifdWriter.WriteTagAsync(TiffTag.Compression, TiffValueCollection.Single((ushort)_compression), cancellationToken).ConfigureAwait(false);
}
}
await next.RunAsync(context).ConfigureAwait(false);
}
public static async Task <int> Wrap(FileInfo source, FileInfo output, CancellationToken cancellationToken)
{
if (source is null || !source.Exists)
{
Console.WriteLine(source is null ? "Input JPEG image is not specified." : "File not found: " + source.FullName);
return(1);
}
if (output is null)
{
Console.WriteLine("Output TIFF file is not specified.");
return(1);
}
byte[] jpegFile = await File.ReadAllBytesAsync(source.FullName, cancellationToken);
var decoder = new JpegDecoder();
decoder.SetInput(jpegFile);
decoder.Identify(loadQuantizationTables: false);
ushort[] bitsPerSample = new ushort[decoder.NumberOfComponents];
ushort bits = (ushort)decoder.Precision;
for (int i = 0; i < bitsPerSample.Length; i++)
{
bitsPerSample[i] = bits;
}
TiffPhotometricInterpretation photometricInterpretation =
bitsPerSample.Length == 1 ? TiffPhotometricInterpretation.BlackIsZero :
bitsPerSample.Length == 3 ? TiffPhotometricInterpretation.YCbCr :
throw new InvalidDataException("Photometric interpretation not supported.");
using (TiffFileWriter writer = await TiffFileWriter.OpenAsync(output.FullName, useBigTiff: false))
{
TiffStreamOffset imageOffset = await writer.WriteAlignedBytesAsync(jpegFile);
TiffStreamOffset ifdOffset;
using (TiffImageFileDirectoryWriter ifdWriter = writer.CreateImageFileDirectory())
{
await ifdWriter.WriteTagAsync(TiffTag.ImageWidth, TiffValueCollection.Single((ushort)decoder.Width));
await ifdWriter.WriteTagAsync(TiffTag.ImageLength, TiffValueCollection.Single((ushort)decoder.Height));
await ifdWriter.WriteTagAsync(TiffTag.BitsPerSample, TiffValueCollection.UnsafeWrap(bitsPerSample));
await ifdWriter.WriteTagAsync(TiffTag.Compression, TiffValueCollection.Single((ushort)TiffCompression.Jpeg));
await ifdWriter.WriteTagAsync(TiffTag.PhotometricInterpretation, TiffValueCollection.Single((ushort)photometricInterpretation));
await ifdWriter.WriteTagAsync(TiffTag.SamplesPerPixel, TiffValueCollection.Single((ushort)bitsPerSample.Length));
await ifdWriter.WriteTagAsync(TiffTag.PlanarConfiguration, TiffValueCollection.Single((ushort)TiffPlanarConfiguration.Chunky));
await ifdWriter.WriteTagAsync(TiffTag.RowsPerStrip, TiffValueCollection.Single((ushort)decoder.Height));
await ifdWriter.WriteTagAsync(TiffTag.StripOffsets, TiffValueCollection.Single((uint)imageOffset.Offset));
await ifdWriter.WriteTagAsync(TiffTag.StripByteCounts, TiffValueCollection.Single((uint)jpegFile.Length));
if (photometricInterpretation == TiffPhotometricInterpretation.YCbCr)
{
int maxHorizontalSampling = decoder.GetMaximumHorizontalSampling();
int maxVerticalSampling = decoder.GetMaximumVerticalSampling();
int yHorizontalSubSampling = maxHorizontalSampling / decoder.GetHorizontalSampling(0);
int yVerticalSubSampling = maxVerticalSampling / decoder.GetVerticalSampling(0);
int cbHorizontalSubSampling = maxHorizontalSampling / decoder.GetHorizontalSampling(1) / yHorizontalSubSampling;
int cbVerticalSubSampling = maxVerticalSampling / decoder.GetVerticalSampling(1) / yVerticalSubSampling;
int crHorizontalSubSampling = maxHorizontalSampling / decoder.GetHorizontalSampling(2) / yHorizontalSubSampling;
int crVerticalSubSampling = maxVerticalSampling / decoder.GetVerticalSampling(2) / yVerticalSubSampling;
if (cbHorizontalSubSampling != crHorizontalSubSampling || cbVerticalSubSampling != crVerticalSubSampling)
{
throw new InvalidDataException("Unsupported JPEG image.");
}
await ifdWriter.WriteTagAsync(TiffTag.YCbCrSubSampling, TiffValueCollection.UnsafeWrap(new ushort[] { (ushort)cbHorizontalSubSampling, (ushort)cbVerticalSubSampling }));
}
// Write other properties here (eg, XResolution, YResolution)
await ifdWriter.WriteTagAsync(TiffTag.XResolution, TiffValueCollection.Single(new TiffRational(96, 1)));
await ifdWriter.WriteTagAsync(TiffTag.YResolution, TiffValueCollection.Single(new TiffRational(96, 1)));
await ifdWriter.WriteTagAsync(TiffTag.ResolutionUnit, TiffValueCollection.Single((ushort)TiffResolutionUnit.Inch));
ifdOffset = await ifdWriter.FlushAsync();
}
writer.SetFirstImageFileDirectoryOffset(ifdOffset);
await writer.FlushAsync();
}
return(0);
}
/// <summary>
/// Crops the input image into multiple strips and runs the next middleware for each strip.
/// </summary>
/// <param name="context">The encoder context.</param>
/// <param name="next">The next middleware.</param>
/// <returns>A <see cref="Task"/> that completes when the image has been encoded.</returns>
public async ValueTask InvokeAsync(TiffImageEncoderContext <TPixel> context, ITiffImageEncoderPipelineNode <TPixel> next)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (next is null)
{
throw new ArgumentNullException(nameof(next));
}
var state = context.GetService(typeof(TiffParallelEncodingState)) as TiffParallelEncodingState;
TiffCroppedImageEncoderContext <TPixel>?wrappedContext = null;
int width = context.ImageSize.Width, height = context.ImageSize.Height;
int rowsPerStrip = _rowsPerStrip <= 0 ? height : _rowsPerStrip;
int stripCount = (height + rowsPerStrip - 1) / rowsPerStrip;
ulong[] stripOffsets = new ulong[stripCount];
ulong[] stripByteCounts = new ulong[stripCount];
state?.LockTaskCompletion();
for (int i = 0; i < stripCount; i++)
{
int offsetY = i * rowsPerStrip;
int stripHeight = Math.Min(height - offsetY, rowsPerStrip);
wrappedContext ??= new TiffCroppedImageEncoderContext <TPixel>(context);
wrappedContext.ExposeIfdWriter = i == 0;
wrappedContext.OutputRegion = default;
wrappedContext.Crop(new TiffPoint(0, offsetY), new TiffSize(width, stripHeight));
if (state is null)
{
await next.RunAsync(wrappedContext).ConfigureAwait(false);
stripOffsets[i] = (ulong)(long)wrappedContext.OutputRegion.Offset;
stripByteCounts[i] = (ulong)wrappedContext.OutputRegion.Length;
}
else
{
TiffCroppedImageEncoderContext <TPixel>?wContext = wrappedContext;
wrappedContext = null;
int currentIndex = i;
await state.DispatchAsync(async() =>
{
await next.RunAsync(wContext).ConfigureAwait(false);
stripOffsets[currentIndex] = (ulong)(long)wContext.OutputRegion.Offset;
stripByteCounts[currentIndex] = (ulong)wContext.OutputRegion.Length;
}, context.CancellationToken).ConfigureAwait(false);
}
}
// Wait until all strips are written.
if (!(state is null))
{
state.ReleaseTaskCompletion();
await state.Complete.Task.ConfigureAwait(false);
}
TiffImageFileDirectoryWriter?ifdWriter = context.IfdWriter;
if (!(ifdWriter is null))
{
CancellationToken cancellationToken = context.CancellationToken;
await ifdWriter.WriteTagAsync(TiffTag.ImageWidth, TiffValueCollection.Single((uint)width), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.ImageLength, TiffValueCollection.Single((uint)height), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.RowsPerStrip, TiffValueCollection.Single((ushort)rowsPerStrip), cancellationToken).ConfigureAwait(false);
if (context.FileWriter?.UseBigTiff ?? false)
{
await ifdWriter.WriteTagAsync(TiffTag.StripOffsets, TiffValueCollection.UnsafeWrap(stripOffsets), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.StripByteCounts, TiffValueCollection.UnsafeWrap(stripByteCounts), cancellationToken).ConfigureAwait(false);
}
else
{
uint[] stripOffsets32 = new uint[stripCount];
uint[] stripByteCounts32 = new uint[stripCount];
for (int i = 0; i < stripCount; i++)
{
stripOffsets32[i] = (uint)stripOffsets[i];
stripByteCounts32[i] = (uint)stripByteCounts[i];
}
await ifdWriter.WriteTagAsync(TiffTag.StripOffsets, TiffValueCollection.UnsafeWrap(stripOffsets32), cancellationToken).ConfigureAwait(false);
await ifdWriter.WriteTagAsync(TiffTag.StripByteCounts, TiffValueCollection.UnsafeWrap(stripByteCounts32), cancellationToken).ConfigureAwait(false);
}
}
}
