/// <summary>
/// Copy the 2-dimensional pixel data into <paramref name="destination"/>, after skipping some rows and columns specified in <paramref name="offset"/>.
/// </summary>
/// <param name="offset">The number rows and columns to skip. X represents the number of columns to skip; Y represents the number of rows to skip.</param>
/// <param name="destination">The destination writer. It also limits the number of rows and columns to copy.</param>
/// <param name="cancellationToken">A <see cref="CancellationToken"/> that fires if the user want to stop the current task.</param>
/// <returns>A <see cref="ValueTask"/> that completes when all the requested pixels are copied.</returns>
public ValueTask ReadAsync(TiffPoint offset, TiffPixelBufferWriter <TPixel> destination, CancellationToken cancellationToken)
{
offset = new TiffPoint(offset.X + _offset.X, offset.Y + _offset.Y);
var readSize = new TiffSize(Math.Min(_size.Width, destination.Width), Math.Min(_size.Height, destination.Height));
if (readSize.IsAreaEmpty)
{
return(default);
/// <summary>
/// Initialize <see cref="TiffPixelBufferWriter{TPixel}"/> to wrap <paramref name="writer"/> and represents the same region as <paramref name="writer"/>.
/// </summary>
/// <param name="writer">The pixel buffer writer. If <paramref name="writer"/> is null, <see cref="TiffPixelBufferWriter{TPixel}"/> will be empty and represents an emtry 2-dimensional region.</param>
public TiffPixelBufferWriter(ITiffPixelBufferWriter <TPixel> writer)
{
_writer = writer ?? TiffEmptyPixelBufferWriter <TPixel> .Default;
if (_writer is TiffPixelBufferWriter <TPixel> structWriter)
{
_writer = structWriter._writer;
_offset = structWriter._offset;
_size = structWriter._size;
}
else
{
_offset = default;
_size = new TiffSize(_writer.Width, _writer.Height);
}
}
internal TiffPixelBufferReader(ITiffPixelBufferReader <TPixel> reader, TiffPoint offset, TiffSize size)
{
_reader = reader;
if (_reader is TiffPixelBufferReader <TPixel> structReader)
{
_reader = structReader._reader;
_offset = structReader._offset;
_size = structReader._size;
}
else
{
_offset = offset;
_size = size;
}
}
internal TiffPixelBufferWriter(ITiffPixelBufferWriter <TPixel> writer, TiffPoint offset, TiffSize size)
{
_writer = writer;
_offset = offset;
_size = size;
}
/// <summary>
/// Initialize <see cref="TiffPixelBuffer{TPixel}"/> to wrap <paramref name="buffer"/> and represents the same region as <paramref name="buffer"/>.
/// </summary>
/// <param name="buffer">The pixel buffer. If <paramref name="buffer"/> is null, <see cref="TiffPixelBuffer{TPixel}"/> will be empty and represents an emtry 2-dimensional region.</param>
public TiffPixelBuffer(ITiffPixelBuffer <TPixel> buffer)
{
_buffer = buffer ?? TiffEmptyPixelBuffer <TPixel> .Default;
_offset = default;
_size = new TiffSize(_buffer.Width, _buffer.Height);
}
internal TiffPixelBuffer(ITiffPixelBuffer <TPixel> buffer, TiffPoint offset, TiffSize size)
{
_buffer = buffer;
_offset = offset;
_size = size;
}
/// <summary>
/// Crop a sub region from <paramref name="writer"/>.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="writer">The original pixel buffer.</param>
/// <param name="offset">The number of columns and rows to skip.</param>
/// <param name="size">The number of columns and rows to take.</param>
/// <returns>A <see cref="TiffPixelBuffer{TPixel}"/> representing the cropped region.</returns>
public static TiffPixelBufferWriter <TPixel> Crop <TPixel>(this TiffPixelBufferWriter <TPixel> writer, TiffPoint offset, TiffSize size) where TPixel : unmanaged
{
if ((uint)offset.X > (uint)writer._size.Width)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if ((uint)offset.Y > (uint)writer._size.Height)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
int offsetX = writer._offset.X + offset.X;
int offsetY = writer._offset.Y + offset.Y;
if ((uint)offsetX > (uint)writer._size.Width)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if ((uint)offsetY > (uint)writer._size.Height)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
int sizeWidth = writer._size.Width - offset.X;
int sizeHeight = writer._size.Height - offset.Y;
if ((uint)size.Width > (uint)sizeWidth)
{
throw new ArgumentOutOfRangeException(nameof(size));
}
if ((uint)size.Height > (uint)sizeHeight)
{
throw new ArgumentOutOfRangeException(nameof(size));
}
return(new TiffPixelBufferWriter <TPixel>(writer._writer, new TiffPoint(offsetX, offsetY), size));
}
/// <summary>
/// Crop a sub region from <paramref name="writer"/>.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="writer">The original pixel buffer.</param>
/// <param name="offset">The number of columns and rows to skip.</param>
/// <param name="size">The number of columns and rows to take.</param>
/// <returns>A <see cref="TiffPixelBuffer{TPixel}"/> representing the cropped region.</returns>
public static TiffPixelBufferWriter <TPixel> Crop <TPixel>(this ITiffPixelBufferWriter <TPixel> writer, TiffPoint offset, TiffSize size) where TPixel : unmanaged
{
if (writer is TiffPixelBufferWriter <TPixel> structWriter)
{
return(structWriter.Crop(offset, size));
}
return(writer.AsPixelBufferWriter().Crop(offset, size));
}
/// <summary>
/// Crop a sub region from <paramref name="buffer"/>.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="buffer">The original pixel buffer.</param>
/// <param name="offset">The number of columns and rows to skip.</param>
/// <param name="size">The number of columns and rows to take.</param>
/// <returns>A <see cref="TiffPixelBuffer{TPixel}"/> representing the cropped region.</returns>
public static TiffPixelBuffer <TPixel> Crop <TPixel>(this ITiffPixelBuffer <TPixel> buffer, TiffPoint offset, TiffSize size) where TPixel : unmanaged
{
return(buffer.AsPixelBuffer().Crop(offset, size));
}
/// <summary> /// Encode an image as well as associated tag fields into TIFF stream. /// </summary> /// <param name="writer">The <see cref="TiffImageFileDirectoryWriter"/> object to write encoded image data and fields to.</param> /// <param name="offset">The number of columns and rows to skip in <paramref name="reader"/>.</param> /// <param name="size">The number of columns and rows to encode in <paramref name="reader"/>.</param> /// <param name="reader">The pixel buffer reader.</param> /// <param name="cancellationToken">The <see cref="CancellationToken"/> that fires if the user has requested to abort the encoding pipeline.</param> /// <returns>A <see cref="Task"/> that completes when the image and fields have been encoded.</returns> public abstract Task EncodeAsync(TiffImageFileDirectoryWriter writer, TiffPoint offset, TiffSize size, ITiffPixelBufferReader <TPixel> reader, CancellationToken cancellationToken = default);
/// <summary>
/// Encode a single image without writing any IFD tag fields.
/// </summary>
/// <param name="writer">The <see cref="TiffFileWriter"/> object to write encoded image data to.</param>
/// <param name="offset">The number of columns and rows to skip in <paramref name="reader"/>.</param>
/// <param name="size">The number of columns and rows to encode in <paramref name="reader"/>.</param>
/// <param name="reader">The pixel buffer reader object.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> that fires if the user has requested to abort the encoding pipeline.</param>
/// <returns>A <see cref="Task{TiffStreamRegion}"/> that completes and return the position and length written into the stream when the image has been encoded.</returns>
public abstract Task <TiffStreamRegion> EncodeAsync(TiffFileWriter writer, TiffPoint offset, TiffSize size, ITiffPixelBufferReader <TPixel> reader, CancellationToken cancellationToken = default);
/// <summary>
/// Initialize <see cref="TiffPixelBufferReader{TPixel}"/> to wrap <paramref name="reader"/>.
/// </summary>
/// <param name="reader">The reader to wrap.</param>
public TiffPixelBufferReader(ITiffPixelBufferReader <TPixel> reader)
{
_reader = reader ?? TiffEmptyPixelBufferReader <TPixel> .Default;
_offset = default;
_size = new TiffSize(_reader.Width, _reader.Height);
}
/// <summary> /// Decode the image into the specified pixel buffer writer. /// </summary> /// <typeparam name="TPixel">The pixel type.</typeparam> /// <param name="offset">Number of columns and rows to skip in the source image.</param> /// <param name="readSize">Number of columns and rows to read from the source image.</param> /// <param name="destinationOffset">Number of columns and rows to skip in the destination writer.</param> /// <param name="writer">The pixel buffer writer to write pixels into.</param> /// <param name="cancellationToken">The <see cref="CancellationToken"/> that fires if the user has requested to abort the decoding pipeline.</param> /// <returns>A <see cref="Task"/> that completes when the image has been decoded.</returns> public abstract Task DecodeAsync <TPixel>(TiffPoint offset, TiffSize readSize, TiffPoint destinationOffset, ITiffPixelBufferWriter <TPixel> writer, CancellationToken cancellationToken = default) where TPixel : unmanaged;
/// <summary> /// Decode the image into the specified pixel buffer writer. /// </summary> /// <typeparam name="TPixel">The pixel type.</typeparam> /// <param name="offset">Number of columns and rows to skip in the source image.</param> /// <param name="readSize">Number of columns and rows to read from the source image.</param> /// <param name="destinationOffset">Number of columns and rows to skip in the destination writer.</param> /// <param name="writer">The pixel buffer writer to write pixels into.</param> public abstract void Decode <TPixel>(TiffPoint offset, TiffSize readSize, TiffPoint destinationOffset, ITiffPixelBufferWriter <TPixel> writer) where TPixel : unmanaged;
