public async Task TestRoundtrip(bool isTile)
{
TiffGray8[] refImage = new TiffGray8[2048 * 2048];
TiffGray8[] testImage = new TiffGray8[2048 * 2048];
var rand = new Random(42);
rand.NextBytes(MemoryMarshal.AsBytes(refImage.AsSpan()));
var builder = new TiffImageEncoderBuilder();
builder.PhotometricInterpretation = TiffPhotometricInterpretation.BlackIsZero;
builder.Compression = TiffCompression.NoCompression;
builder.IsTiled = isTile;
// Make sure we have at least CacheSize strips or tiles
// Cache size in the current implementation is 256
// Any value greater than 256 should be OK.
builder.RowsPerStrip = 2; // 1024 strips
builder.TileSize = new TiffSize(16, 16); // 16384 tiles
var ms = new MemoryStream();
await GenerateImageAsync(ms, builder, TiffPixelBuffer.WrapReadOnly(refImage, 2048, 2048));
ms.Seek(0, SeekOrigin.Begin);
await using TiffFileReader tiff = await TiffFileReader.OpenAsync(ms, leaveOpen : true);
TiffImageDecoder decoder = await tiff.CreateImageDecoderAsync();
await decoder.DecodeAsync(TiffPixelBuffer.Wrap(testImage, 2048, 2048));
Assert.True(refImage.AsSpan().SequenceEqual(testImage.AsSpan()));
}
public async Task TestRoundtrip(bool isTile, int maxDegreeOfParallelism, bool isYCbCr)
{
TiffGray8[] refImage = new TiffGray8[4096 * 4096];
TiffGray8[] testImage = new TiffGray8[4096 * 4096];
var rand = new Random(42);
rand.NextBytes(MemoryMarshal.AsBytes(refImage.AsSpan()));
var builder = new TiffImageEncoderBuilder();
if (isYCbCr)
{
builder.PhotometricInterpretation = TiffPhotometricInterpretation.YCbCr;
builder.HorizontalChromaSubSampling = 2;
builder.VerticalChromaSubSampling = 2;
}
else
{
builder.PhotometricInterpretation = TiffPhotometricInterpretation.BlackIsZero;
builder.Predictor = TiffPredictor.HorizontalDifferencing;
}
builder.Compression = TiffCompression.Lzw;
builder.IsTiled = isTile;
builder.RowsPerStrip = 64;
builder.TileSize = new TiffSize(64, 64);
builder.MaxDegreeOfParallelism = maxDegreeOfParallelism;
var ms = new MemoryStream();
await GenerateImageAsync(ms, builder, TiffPixelBuffer.WrapReadOnly(refImage, 4096, 4096));
ms.Seek(0, SeekOrigin.Begin);
await using TiffFileReader tiff = await TiffFileReader.OpenAsync(ms, leaveOpen : true);
TiffImageDecoder decoder = await tiff.CreateImageDecoderAsync();
await decoder.DecodeAsync(TiffPixelBuffer.Wrap(testImage, 4096, 4096));
Assert.True(refImage.AsSpan().SequenceEqual(testImage.AsSpan()));
}