/// <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 TiffPixelBuffer <TPixel> buffer, TiffPoint offset, TiffSize size) where TPixel : unmanaged
{
if ((uint)offset.X > (uint)buffer._size.Width)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if ((uint)offset.Y > (uint)buffer._size.Height)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
int offsetX = buffer._offset.X + offset.X;
int offsetY = buffer._offset.Y + offset.Y;
if ((uint)offsetX > (uint)buffer._size.Width)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if ((uint)offsetY > (uint)buffer._size.Height)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
int sizeWidth = buffer._size.Width - offset.X;
int sizeHeight = buffer._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 TiffPixelBuffer <TPixel>(buffer._buffer, new TiffPoint(offsetX, offsetY), size));
}
/// <summary>
/// Decode the image into the specified pixel buffer.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="decoder">The image decoder.</param>
/// <param name="buffer">The pixel buffer to write pixels into.</param>
public static void Decode <TPixel>(this TiffImageDecoder decoder, TiffPixelBuffer <TPixel> buffer) where TPixel : unmanaged
{
if (decoder is null)
{
throw new ArgumentNullException(nameof(decoder));
}
if (buffer.IsEmpty)
{
return;
}
ITiffPixelBuffer <TPixel> innerBuffer = TiffPixelBufferUnsafeMarshal.GetBuffer(buffer, out TiffPoint offset, out TiffSize size);
decoder.Decode(default, size, offset, innerBuffer);
/// <summary>
/// Decode the image into the specified pixel buffer.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="decoder">The image decoder.</param>
/// <param name="buffer">The pixel buffer 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 static Task DecodeAsync <TPixel>(this TiffImageDecoder decoder, TiffPixelBuffer <TPixel> buffer, CancellationToken cancellationToken = default) where TPixel : unmanaged
{
if (decoder is null)
{
throw new ArgumentNullException(nameof(decoder));
}
if (buffer.IsEmpty)
{
return(Task.CompletedTask);
}
ITiffPixelBuffer <TPixel> innerBuffer = TiffPixelBufferUnsafeMarshal.GetBuffer(buffer, out TiffPoint offset, out TiffSize size);
return(decoder.DecodeAsync(default, size, offset, innerBuffer, cancellationToken));
