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DW-39: Support TIFF files larger than 2 GB via page-by-page streaming #151

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DW-39: Support TIFF files larger than 2 GB via page-by-page streaming #151

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7298ac0
DW-39: Add Support for large tiff streaming
Sawraz-IS Jun 15, 2026
ec97898
update(DW-39): fix streamed-TIFF byte/format divergence and >32767-pa…
Sawraz-IS Jul 2, 2026
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69 changes: 69 additions & 0 deletions IronSoftware.Drawing/IronSoftware.Drawing.Common.Tests/UnitTests/AnyBitmapFunctionality.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -579,6 +579,75 @@ public void Try_UnLoad_Tiff_Image()
Assert.Equal(2, anyBitmap.FrameCount);
}

[FactWithAutomaticDisplayName]
public void FromTiffFile_StreamsMultiPageTiff_MatchesFromFile()
{
string tiffPath = GetRelativeFilePath("IRON-274-39065.tif");

// Baseline: the standard in-memory loader.
var expected = AnyBitmap.FromFile(tiffPath);

// Streaming loader: the path used automatically for TIFF files > ~2 GB.
var streamed = AnyBitmap.FromTiffFile(tiffPath);

streamed.FrameCount.Should().Be(expected.FrameCount);

var expectedFrames = expected.GetAllFrames.ToList();
var streamedFrames = streamed.GetAllFrames.ToList();
streamedFrames.Count.Should().Be(expectedFrames.Count);
for (int i = 0; i < expectedFrames.Count; i++)
{
streamedFrames[i].Width.Should().Be(expectedFrames[i].Width);
streamedFrames[i].Height.Should().Be(expectedFrames[i].Height);
}

// Content equivalence, not just dimensions: the decoded pixels of each
// page must match the in-memory loader.
for (int i = 0; i < expectedFrames.Count; i++)
{
expectedFrames[i].SaveAs($"expected-frame{i}.png");
streamedFrames[i].SaveAs($"streamed-frame{i}.png");
AssertImageAreEqual($"expected-frame{i}.png", $"streamed-frame{i}.png");
}
}

[FactWithAutomaticDisplayName]
public void FromTiffFile_RawBytesAndFormat_ReportTiff()
{
string tiffPath = GetRelativeFilePath("IRON-274-39065.tif");

var streamed = AnyBitmap.FromTiffFile(tiffPath);

// The streamed bitmap keeps no original byte[]; the raw-byte accessors and
// GetImageFormat must re-encode the pages as a multi-page TIFF (matching
// FromFile) rather than reporting a single-page BMP.
streamed.GetImageFormat().Should().Be(AnyBitmap.ImageFormat.Tiff);

byte[] bytes = streamed.GetBytes();
var roundTrip = AnyBitmap.FromBytes(bytes);
roundTrip.GetImageFormat().Should().Be(AnyBitmap.ImageFormat.Tiff);
roundTrip.FrameCount.Should().Be(streamed.FrameCount);
}

[FactWithAutomaticDisplayName]
public void FromTiffFile_StreamsEveryPage_OfMultiPageTiff()
{
string tiffPath = GetRelativeFilePath("test_dw_10.tif");

var expected = AnyBitmap.FromFile(tiffPath);
var streamed = AnyBitmap.FromTiffFile(tiffPath);

streamed.FrameCount.Should().Be(expected.FrameCount);
streamed.FrameCount.Should().BeGreaterThan(1);
}

[FactWithAutomaticDisplayName]
public void FromTiffFile_MissingFile_ThrowsFileNotFound()
{
Action act = () => AnyBitmap.FromTiffFile(GetRelativeFilePath("does-not-exist-DW39.tiff"));
act.Should().Throw<FileNotFoundException>();
}

[FactWithAutomaticDisplayName]
public void Create_Multi_page_Tiff()
{
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