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 TestAsync(string reference, string test)
{
using var refImage = Image.Load <L8>(reference);
await using TiffFileReader tiff = await TiffFileReader.OpenAsync(test);
TiffStreamOffset ifdOffset = tiff.FirstImageFileDirectoryOffset;
while (!ifdOffset.IsZero)
{
TiffImageFileDirectory ifd = await tiff.ReadImageFileDirectoryAsync(ifdOffset);
TiffImageDecoder decoder = await tiff.CreateImageDecoderAsync(ifd, new TiffImageDecoderOptions { UndoColorPreMultiplying = true });
Assert.Equal(refImage.Width, decoder.Width);
Assert.Equal(refImage.Height, decoder.Height);
TiffGray8[] pixels = new TiffGray8[decoder.Width * decoder.Height];
await decoder.DecodeAsync(TiffPixelBuffer.Wrap(pixels, decoder.Width, decoder.Height));
AssertEqual(refImage, pixels);
using (var image = new Image <L8>(decoder.Width, decoder.Height))
{
decoder.Decode(image);
AssertEqual(refImage, image);
}
ifdOffset = ifd.NextOffset;
}
}
public void Test(string reference, string test)
{
using var refImage = Image.Load <Rgb24>(reference);
using var tiff = TiffFileReader.Open(test);
TiffStreamOffset ifdOffset = tiff.FirstImageFileDirectoryOffset;
while (!ifdOffset.IsZero)
{
TiffImageFileDirectory ifd = tiff.ReadImageFileDirectory(ifdOffset);
TiffImageDecoder decoder = tiff.CreateImageDecoder(ifd, new TiffImageDecoderOptions {
UndoColorPreMultiplying = true
});
Assert.Equal(refImage.Width, decoder.Width);
Assert.Equal(refImage.Height, decoder.Height);
TiffRgb24[] pixels = new TiffRgb24[decoder.Width * decoder.Height];
decoder.Decode(TiffPixelBuffer.Wrap(pixels, decoder.Width, decoder.Height));
AssertEqual(refImage, pixels);
using (var image = new Image <Rgb24>(decoder.Width, decoder.Height))
{
decoder.Decode(image);
AssertEqual(refImage, image);
}
ifdOffset = ifd.NextOffset;
}
}
public async Task TestImageDecodeAsync(string refImage, int refIfd, int refBitDepth, string testImage, int testIfd, int testBitDepth)
{
const int BufferBitDepth = 16;
// We do not support decoding into 32 bit buffer yet.
refBitDepth = Math.Min(refBitDepth, BufferBitDepth);
testBitDepth = Math.Min(testBitDepth, BufferBitDepth);
TiffStreamOffset ifdOffset;
TiffImageFileDirectory ifd;
// Load reference image
await using TiffFileReader refTiff = await TiffFileReader.OpenAsync(refImage);
ifdOffset = refTiff.FirstImageFileDirectoryOffset;
Assert.False(ifdOffset.IsZero);
for (int i = 0; i < refIfd; i++)
{
ifd = await refTiff.ReadImageFileDirectoryAsync(ifdOffset);
ifdOffset = ifd.NextOffset;
Assert.False(ifdOffset.IsZero);
}
ifd = await refTiff.ReadImageFileDirectoryAsync(ifdOffset);
TiffImageDecoder refDecoder = await refTiff.CreateImageDecoderAsync(ifd);
// Load test image
await using TiffFileReader testTiff = await TiffFileReader.OpenAsync(testImage);
ifdOffset = testTiff.FirstImageFileDirectoryOffset;
Assert.False(ifdOffset.IsZero);
for (int i = 0; i < testIfd; i++)
{
ifd = await testTiff.ReadImageFileDirectoryAsync(ifdOffset);
ifdOffset = ifd.NextOffset;
Assert.False(ifdOffset.IsZero);
}
ifd = await testTiff.ReadImageFileDirectoryAsync(ifdOffset);
TiffImageDecoder testDecoder = await testTiff.CreateImageDecoderAsync(ifd);
Assert.Equal(refDecoder.Width, testDecoder.Width);
Assert.Equal(refDecoder.Height, testDecoder.Height);
TiffRgba64[] refBuffer = new TiffRgba64[refDecoder.Width * refDecoder.Height];
TiffRgba64[] testBuffer = new TiffRgba64[testDecoder.Width * testDecoder.Height];
await refDecoder.DecodeAsync(TiffPixelBuffer.Wrap(refBuffer, refDecoder.Width, refDecoder.Height));
await testDecoder.DecodeAsync(TiffPixelBuffer.Wrap(testBuffer, testDecoder.Width, testDecoder.Height));
ShiftPixels(MemoryMarshal.Cast <TiffRgba64, ushort>(refBuffer), BufferBitDepth - refBitDepth);
ShiftPixels(MemoryMarshal.Cast <TiffRgba64, ushort>(testBuffer), BufferBitDepth - testBitDepth);
Assert.True(refBuffer.AsSpan().SequenceEqual(testBuffer));
}
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()));
}
public void TestMemoryPixelBuffer()
{
ITiffPixelBuffer <TiffGray8> pixelBuffer = InitializePixelBuffer(out TiffGray8[] pixels);
Assert.Equal(3, pixelBuffer.Width);
Assert.Equal(2, pixelBuffer.Height);
Span <TiffGray8> span = pixelBuffer.GetSpan();
Assert.True(Unsafe.AreSame(ref pixels[0], ref span[0]));
Assert.Equal(6, span.Length);
span[0] = new TiffGray8(0xCD);
span[5] = new TiffGray8(0xEF);
Assert.Equal(0xCD, pixels[0].Intensity);
Assert.Equal(0xEF, pixels[5].Intensity);
Assert.Throws <ArgumentOutOfRangeException>("width", () => TiffPixelBuffer.Wrap(Array.Empty <TiffGray8>(), -1, 0));
Assert.Throws <ArgumentOutOfRangeException>("height", () => TiffPixelBuffer.Wrap(Array.Empty <TiffGray8>(), 0, -1));
}
public void TestCrop()
{
ITiffPixelBuffer <TiffGray8> pixelBuffer = InitializePixelBuffer(out TiffGray8[] pixels);
TiffPixelBuffer <TiffGray8> structBuffer = pixelBuffer.AsPixelBuffer();
Assert.Equal(3, structBuffer.Width);
Assert.Equal(2, structBuffer.Height);
Assert.False(structBuffer.IsEmpty);
Assert.Throws <ArgumentOutOfRangeException>("offset", () => structBuffer.Crop(new TiffPoint(4, 0)));
Assert.Throws <ArgumentOutOfRangeException>("offset", () => structBuffer.Crop(new TiffPoint(0, 3)));
Assert.Throws <ArgumentOutOfRangeException>("offset", () => structBuffer.Crop(new TiffPoint(4, 3)));
Assert.Throws <ArgumentOutOfRangeException>("size", () => structBuffer.Crop(new TiffPoint(0, 0), new TiffSize(4, 1)));
Assert.Throws <ArgumentOutOfRangeException>("size", () => structBuffer.Crop(new TiffPoint(0, 0), new TiffSize(1, 3)));
Assert.Throws <ArgumentOutOfRangeException>("size", () => structBuffer.Crop(new TiffPoint(0, 0), new TiffSize(4, 3)));
structBuffer = pixelBuffer.Crop(new TiffPoint(1, 1), new TiffSize(1, 1));
Assert.Equal(1, structBuffer.Width);
Assert.Equal(1, structBuffer.Height);
structBuffer = pixelBuffer.AsPixelBuffer().Crop(new TiffPoint(1, 1), new TiffSize(1, 1));
Assert.Equal(1, structBuffer.Width);
Assert.Equal(1, structBuffer.Height);
structBuffer = pixelBuffer.Crop(new TiffPoint(1, 1));
Assert.Equal(2, structBuffer.Width);
Assert.Equal(1, structBuffer.Height);
structBuffer = pixelBuffer.AsPixelBuffer().Crop(new TiffPoint(1, 1));
Assert.Equal(2, structBuffer.Width);
Assert.Equal(1, structBuffer.Height);
ITiffPixelBuffer <TiffGray8> pixelBuffer2 = TiffPixelBufferUnsafeMarshal.GetBuffer(structBuffer, out TiffPoint offset, out TiffSize size);
Assert.True(ReferenceEquals(pixelBuffer, pixelBuffer2));
Assert.Equal(1, offset.X);
Assert.Equal(1, offset.Y);
Assert.Equal(2, size.Width);
Assert.Equal(1, size.Height);
}
public void Setup()
{
TiffGray8[] image = new TiffGray8[8192 * 8192];
_image = TiffPixelBuffer.WrapReadOnly(image, 8192, 8192);
var builder = new TiffImageEncoderBuilder();
builder.PhotometricInterpretation = TiffPhotometricInterpretation.WhiteIsZero;
builder.Compression = Compression;
builder.MaxDegreeOfParallelism = DegreeOfParallelism;
// Strip encoder
builder.IsTiled = false;
builder.RowsPerStrip = 256;
_stripEncoder = builder.Build <TiffGray8>();
// Tile encoder
builder.IsTiled = false;
builder.TileSize = new TiffSize(512, 512);
_tileEncoder = builder.Build <TiffGray8>();
}
public async Task Setup()
{
TiffGray8[] image = new TiffGray8[8192 * 8192];
_scratchSpace = TiffPixelBuffer.Wrap(image, 8192, 8192);
var builder = new TiffImageEncoderBuilder();
builder.PhotometricInterpretation = TiffPhotometricInterpretation.WhiteIsZero;
builder.Compression = Compression;
// Generate a image with many strips
var ms = new MemoryStream();
builder.IsTiled = false;
builder.RowsPerStrip = 256;
await GenerateImageAsync(ms, builder, _scratchSpace);
_stripTestTiff = ms.ToArray();
ms.SetLength(0);
// Generate a image with many tiles
builder.IsTiled = true;
builder.TileSize = new TiffSize(512, 512);
await GenerateImageAsync(ms, builder, _scratchSpace);
_tileTestTiff = ms.ToArray();
_stripReader = await TiffFileReader.OpenAsync(_stripTestTiff);
_stripDecoder = await _stripReader.CreateImageDecoderAsync(new TiffImageDecoderOptions { MaxDegreeOfParallelism = DegreeOfParallelism });
await _stripDecoder.DecodeAsync(_scratchSpace);
_tileReader = await TiffFileReader.OpenAsync(_tileTestTiff);
_tileDecoder = await _tileReader.CreateImageDecoderAsync(new TiffImageDecoderOptions { MaxDegreeOfParallelism = DegreeOfParallelism });
await _tileDecoder.DecodeAsync(_scratchSpace);
}
public async Task Setup()
{
TiffGray8[] image = new TiffGray8[8192 * 8192];
_scratchSpace = TiffPixelBuffer.Wrap(image, 8192, 8192);
var builder = new TiffImageEncoderBuilder();
builder.PhotometricInterpretation = TiffPhotometricInterpretation.BlackIsZero;
builder.Compression = TiffCompression.NoCompression;
// Generate a image with many strips
var ms = new MemoryStream();
builder.IsTiled = false;
builder.RowsPerStrip = 1;
await GenerateImageAsync(ms, builder, _scratchSpace);
_stripTestTiff = ms.ToArray();
ms.SetLength(0);
// Generate a image with many tiles
builder.IsTiled = true;
builder.TileSize = new TiffSize(16, 16); // the minimum tile size
await GenerateImageAsync(ms, builder, _scratchSpace);
_tileTestTiff = ms.ToArray();
_stripReader = await TiffFileReader.OpenAsync(_stripTestTiff);
_stripDecoder = await _stripReader.CreateImageDecoderAsync();
await _stripDecoder.DecodeAsync(_scratchSpace);
_tileReader = await TiffFileReader.OpenAsync(_tileTestTiff);
_tileDecoder = await _tileReader.CreateImageDecoderAsync();
await _tileDecoder.DecodeAsync(_scratchSpace);
}
private static async Task GenerateImageAsync(Stream stream, TiffImageEncoderBuilder builder, TiffPixelBuffer <TiffGray8> image)
{
using (TiffFileWriter writer = await TiffFileWriter.OpenAsync(stream, true))
{
TiffStreamOffset ifdOffset;
using (TiffImageFileDirectoryWriter ifdWriter = writer.CreateImageFileDirectory())
{
TiffImageEncoder <TiffGray8> encoder = builder.Build <TiffGray8>();
await encoder.EncodeAsync(ifdWriter, image);
ifdOffset = await ifdWriter.FlushAsync();
}
writer.SetFirstImageFileDirectoryOffset(ifdOffset);
await writer.FlushAsync();
}
}