/// <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 void TestCmyk32()
{
Assert.Equal(4, Unsafe.SizeOf <TiffCmyk32>());
var defaultPixel = default(TiffCmyk32);
Assert.Equal(0, defaultPixel.C);
Assert.Equal(0, defaultPixel.M);
Assert.Equal(0, defaultPixel.Y);
Assert.Equal(0, defaultPixel.K);
var pixel1 = new TiffCmyk32(0x12, 0x34, 0x56, 0x78);
Assert.Equal(0x12, pixel1.C);
Assert.Equal(0x34, pixel1.M);
Assert.Equal(0x56, pixel1.Y);
Assert.Equal(0x78, pixel1.K);
Assert.False(pixel1.Equals(defaultPixel));
Assert.False(defaultPixel.Equals(pixel1));
Assert.False(pixel1 == defaultPixel);
Assert.False(defaultPixel == pixel1);
Assert.True(pixel1 != defaultPixel);
Assert.True(defaultPixel != pixel1);
Assert.False(pixel1.GetHashCode() == defaultPixel.GetHashCode());
var pixel2 = new TiffCmyk32(0x12, 0x34, 0x56, 0x78);
Assert.True(pixel1.Equals(pixel2));
Assert.True(pixel2.Equals(pixel1));
Assert.True(pixel1 == pixel2);
Assert.True(pixel2 == pixel1);
Assert.False(pixel1 != pixel2);
Assert.False(pixel2 != pixel1);
Assert.True(pixel1.GetHashCode() == pixel2.GetHashCode());
}
