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Fix Paeth Filter decode on platforms that do not support Ssse3 #2618

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merged 1 commit into from
Dec 12, 2023
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Fix Paeth Filter decode on platforms that do not support Ssse3 #2618

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6 changes: 3 additions & 3 deletions src/ImageSharp/Formats/Png/Filters/PaethFilter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -35,9 +35,9 @@ public static void Decode(Span<byte> scanline, Span<byte> previousScanline, int
// row: a d
// The Paeth function predicts d to be whichever of a, b, or c is nearest to
// p = a + b - c.
if (Sse2.IsSupported && bytesPerPixel is 4)
if (Ssse3.IsSupported && bytesPerPixel is 4)
{
DecodeSse3(scanline, previousScanline);
DecodeSsse3(scanline, previousScanline);
}
else if (AdvSimd.Arm64.IsSupported && bytesPerPixel is 4)
{
Expand All @@ -50,7 +50,7 @@ public static void Decode(Span<byte> scanline, Span<byte> previousScanline, int
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static void DecodeSse3(Span<byte> scanline, Span<byte> previousScanline)
private static void DecodeSsse3(Span<byte> scanline, Span<byte> previousScanline)
{
ref byte scanBaseRef = ref MemoryMarshal.GetReference(scanline);
ref byte prevBaseRef = ref MemoryMarshal.GetReference(previousScanline);
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3 changes: 3 additions & 0 deletions tests/ImageSharp.Tests/Formats/Png/PngDecoderFilterTests.cs
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Expand Up @@ -170,6 +170,9 @@ private static void RunPaethFilterTest()
[Fact]
public void PaethFilter_WithHardwareIntrinsics_Works() => FeatureTestRunner.RunWithHwIntrinsicsFeature(RunPaethFilterTest, HwIntrinsics.AllowAll);

[Fact]
public void PaethFilter_WithoutSsse3_Works() => FeatureTestRunner.RunWithHwIntrinsicsFeature(RunPaethFilterTest, HwIntrinsics.DisableSSSE3);

[Fact]
public void PaethFilter_WithoutHardwareIntrinsics_Works() => FeatureTestRunner.RunWithHwIntrinsicsFeature(RunPaethFilterTest, HwIntrinsics.DisableHWIntrinsic);
}