mirror of https://github.com/SixLabors/ImageSharp
Brian Popow
5 years ago
committed by
GitHub
GitHub
26 changed files with 755 additions and 422 deletions
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// Copyright (c) Six Labors.
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// Licensed under the Apache License, Version 2.0.
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using System; |
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using SixLabors.ImageSharp.Formats.Jpeg.Components; |
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using SixLabors.ImageSharp.Formats.Jpeg.Components.Encoder; |
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using SixLabors.ImageSharp.Tests.TestUtilities; |
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using Xunit; |
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using Xunit.Abstractions; |
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// ReSharper disable InconsistentNaming
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namespace SixLabors.ImageSharp.Tests.Formats.Jpg |
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{ |
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[Trait("Format", "Jpg")] |
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public class HuffmanScanEncoderTests |
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{ |
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private ITestOutputHelper Output { get; } |
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public HuffmanScanEncoderTests(ITestOutputHelper output) |
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{ |
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this.Output = output; |
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} |
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private static int GetHuffmanEncodingLength_Reference(uint number) |
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{ |
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int bits = 0; |
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if (number > 32767) |
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{ |
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number >>= 16; |
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bits += 16; |
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} |
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if (number > 127) |
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{ |
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number >>= 8; |
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bits += 8; |
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} |
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if (number > 7) |
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{ |
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number >>= 4; |
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bits += 4; |
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} |
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if (number > 1) |
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{ |
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number >>= 2; |
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bits += 2; |
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} |
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if (number > 0) |
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{ |
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bits++; |
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} |
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return bits; |
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} |
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[Fact] |
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public void GetHuffmanEncodingLength_Zero() |
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{ |
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int expected = 0; |
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int actual = HuffmanScanEncoder.GetHuffmanEncodingLength(0); |
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Assert.Equal(expected, actual); |
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} |
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[Theory] |
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[InlineData(1)] |
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[InlineData(2)] |
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public void GetHuffmanEncodingLength_Random(int seed) |
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{ |
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int maxNumber = 1 << 16; |
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var rng = new Random(seed); |
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for (int i = 0; i < 1000; i++) |
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{ |
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uint number = (uint)rng.Next(0, maxNumber); |
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int expected = GetHuffmanEncodingLength_Reference(number); |
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int actual = HuffmanScanEncoder.GetHuffmanEncodingLength(number); |
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Assert.Equal(expected, actual); |
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} |
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} |
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[Fact] |
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public void GetLastValuableElementIndex_AllZero() |
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{ |
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static void RunTest() |
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{ |
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Block8x8F data = default; |
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int expectedLessThan = 1; |
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int actual = HuffmanScanEncoder.GetLastValuableElementIndex(ref data); |
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Assert.True(actual < expectedLessThan); |
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} |
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FeatureTestRunner.RunWithHwIntrinsicsFeature( |
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RunTest, |
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HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX2); |
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} |
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[Fact] |
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public void GetLastValuableElementIndex_AllNonZero() |
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{ |
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static void RunTest() |
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{ |
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Block8x8F data = default; |
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for (int i = 0; i < Block8x8F.Size; i++) |
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{ |
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data[i] = 10; |
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} |
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int expected = Block8x8F.Size - 1; |
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int actual = HuffmanScanEncoder.GetLastValuableElementIndex(ref data); |
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Assert.Equal(expected, actual); |
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} |
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FeatureTestRunner.RunWithHwIntrinsicsFeature( |
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RunTest, |
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HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX2); |
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} |
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[Theory] |
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[InlineData(1)] |
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[InlineData(2)] |
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public void GetLastValuableElementIndex_RandomFilledSingle(int seed) |
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{ |
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static void RunTest(string seedSerialized) |
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{ |
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int seed = FeatureTestRunner.Deserialize<int>(seedSerialized); |
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var rng = new Random(seed); |
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for (int i = 0; i < 1000; i++) |
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{ |
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Block8x8F data = default; |
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int setIndex = rng.Next(1, Block8x8F.Size); |
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data[setIndex] = rng.Next(); |
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int expected = setIndex; |
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int actual = HuffmanScanEncoder.GetLastValuableElementIndex(ref data); |
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Assert.Equal(expected, actual); |
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} |
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} |
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FeatureTestRunner.RunWithHwIntrinsicsFeature( |
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RunTest, |
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seed, |
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HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX2); |
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} |
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[Theory] |
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[InlineData(1)] |
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[InlineData(2)] |
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public void GetLastValuableElementIndex_RandomFilledPartially(int seed) |
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{ |
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static void RunTest(string seedSerialized) |
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{ |
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int seed = FeatureTestRunner.Deserialize<int>(seedSerialized); |
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var rng = new Random(seed); |
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for (int i = 0; i < 1000; i++) |
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{ |
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Block8x8F data = default; |
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int lastIndex = rng.Next(1, Block8x8F.Size); |
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int fillValue = rng.Next(); |
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for (int dataIndex = 0; dataIndex <= lastIndex; dataIndex++) |
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{ |
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data[dataIndex] = fillValue; |
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} |
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int expected = lastIndex; |
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int actual = HuffmanScanEncoder.GetLastValuableElementIndex(ref data); |
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Assert.Equal(expected, actual); |
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} |
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} |
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FeatureTestRunner.RunWithHwIntrinsicsFeature( |
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RunTest, |
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seed, |
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HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX2); |
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} |
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[Theory] |
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[InlineData(1)] |
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[InlineData(2)] |
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public void GetLastValuableElementIndex_RandomFilledFragmented(int seed) |
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{ |
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static void RunTest(string seedSerialized) |
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{ |
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int seed = FeatureTestRunner.Deserialize<int>(seedSerialized); |
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var rng = new Random(seed); |
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for (int i = 0; i < 1000; i++) |
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{ |
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Block8x8F data = default; |
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int fillValue = rng.Next(); |
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// first filled chunk
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int lastIndex1 = rng.Next(1, Block8x8F.Size / 2); |
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for (int dataIndex = 0; dataIndex <= lastIndex1; dataIndex++) |
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{ |
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data[dataIndex] = fillValue; |
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} |
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// second filled chunk, there might be a spot with zero(s) between first and second chunk
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int lastIndex2 = rng.Next(lastIndex1 + 1, Block8x8F.Size); |
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for (int dataIndex = 0; dataIndex <= lastIndex2; dataIndex++) |
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{ |
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data[dataIndex] = fillValue; |
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} |
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int expected = lastIndex2; |
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int actual = HuffmanScanEncoder.GetLastValuableElementIndex(ref data); |
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Assert.Equal(expected, actual); |
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} |
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} |
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FeatureTestRunner.RunWithHwIntrinsicsFeature( |
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RunTest, |
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seed, |
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HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX2); |
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} |
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} |
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} |
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