mirror of https://github.com/SixLabors/ImageSharp
Anton Firszov
9 years ago
21 changed files with 275 additions and 177 deletions
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namespace SixLabors.ImageSharp.Formats.Jpeg.Common |
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{ |
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/// <summary>
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/// Provides enumeration of the various available subsample ratios.
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/// https://en.wikipedia.org/wiki/Chroma_subsampling
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/// </summary>
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internal enum SubsampleRatio |
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{ |
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Undefined, |
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/// <summary>
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/// 4:4:4
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/// </summary>
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Ratio444, |
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/// <summary>
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/// 4:2:2
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/// </summary>
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Ratio422, |
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/// <summary>
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/// 4:2:0
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/// </summary>
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Ratio420, |
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/// <summary>
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/// 4:4:0
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/// </summary>
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Ratio440, |
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/// <summary>
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/// 4:1:1
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/// </summary>
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Ratio411, |
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/// <summary>
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/// 4:1:0
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/// </summary>
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Ratio410, |
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} |
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} |
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@ -0,0 +1,124 @@ |
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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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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using SixLabors.ImageSharp.Formats.Jpeg.Common; |
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using SixLabors.ImageSharp.Formats.Jpeg.GolangPort; |
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using SixLabors.ImageSharp.Formats.Jpeg.GolangPort.Components.Decoder; |
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using SixLabors.ImageSharp.Tests.Formats.Jpg.Utils; |
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using SixLabors.Primitives; |
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using Xunit; |
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using Xunit.Abstractions; |
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public class ComponentUtilsTests |
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{ |
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public ComponentUtilsTests(ITestOutputHelper output) |
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{ |
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this.Output = output; |
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} |
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private ITestOutputHelper Output { get; } |
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[Theory] |
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[InlineData(SubsampleRatio.Ratio410, 4, 2)] |
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[InlineData(SubsampleRatio.Ratio411, 4, 1)] |
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[InlineData(SubsampleRatio.Ratio420, 2, 2)] |
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[InlineData(SubsampleRatio.Ratio422, 2, 1)] |
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[InlineData(SubsampleRatio.Ratio440, 1, 2)] |
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[InlineData(SubsampleRatio.Ratio444, 1, 1)] |
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internal void CalculateChrominanceSize( |
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SubsampleRatio ratio, |
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int expectedDivX, |
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int expectedDivY) |
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{ |
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//this.Output.WriteLine($"RATIO: {ratio}");
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Size size = ratio.CalculateChrominanceSize(400, 400); |
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//this.Output.WriteLine($"Ch Size: {size}");
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Assert.Equal(new Size(400 / expectedDivX, 400 / expectedDivY), size); |
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} |
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[Theory] |
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[InlineData(SubsampleRatio.Ratio410, 4)] |
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[InlineData(SubsampleRatio.Ratio411, 4)] |
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[InlineData(SubsampleRatio.Ratio420, 2)] |
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[InlineData(SubsampleRatio.Ratio422, 2)] |
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[InlineData(SubsampleRatio.Ratio440, 1)] |
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[InlineData(SubsampleRatio.Ratio444, 1)] |
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internal void Create(SubsampleRatio ratio, int expectedCStrideDiv) |
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{ |
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this.Output.WriteLine($"RATIO: {ratio}"); |
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YCbCrImage img = new YCbCrImage(400, 400, ratio); |
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//this.PrintChannel("Y", img.YChannel);
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//this.PrintChannel("Cb", img.CbChannel);
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//this.PrintChannel("Cr", img.CrChannel);
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Assert.Equal(400, img.YChannel.Width); |
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Assert.Equal(img.CbChannel.Width, 400 / expectedCStrideDiv); |
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Assert.Equal(img.CrChannel.Width, 400 / expectedCStrideDiv); |
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} |
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private void PrintChannel(string name, OrigJpegPixelArea channel) |
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{ |
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this.Output.WriteLine($"{name}: Stride={channel.Stride}"); |
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} |
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[Fact] |
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public void CalculateJpegChannelSize_Grayscale() |
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{ |
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using (OrigJpegDecoderCore decoder = JpegFixture.ParseStream(TestImages.Jpeg.Baseline.Jpeg400)) |
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{ |
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Assert.Equal(1, decoder.ComponentCount); |
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Size expected = decoder.Components[0].SizeInBlocks() * 8; |
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Size actual = decoder.Components[0].CalculateJpegChannelSize(decoder.SubsampleRatio); |
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Assert.Equal(expected, actual); |
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} |
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} |
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[Theory] |
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[InlineData(TestImages.Jpeg.Baseline.Calliphora, 1)] |
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[InlineData(TestImages.Jpeg.Baseline.Jpeg444, 1)] |
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[InlineData(TestImages.Jpeg.Baseline.Jpeg420, 2)] |
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public void CalculateJpegChannelSize_YCbCr( |
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string imageFile, |
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int chromaDiv) |
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{ |
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using (OrigJpegDecoderCore decoder = JpegFixture.ParseStream(imageFile)) |
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{ |
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Size ySize = decoder.Components[0].SizeInBlocks() * 8; |
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Size cSize = decoder.Components[1].SizeInBlocks() * 8 / chromaDiv; |
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Size s0 = decoder.Components[0].CalculateJpegChannelSize(decoder.SubsampleRatio); |
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Size s1 = decoder.Components[1].CalculateJpegChannelSize(decoder.SubsampleRatio); |
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Size s2 = decoder.Components[2].CalculateJpegChannelSize(decoder.SubsampleRatio); |
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Assert.Equal(ySize, s0); |
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Assert.Equal(cSize, s1); |
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Assert.Equal(cSize, s2); |
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} |
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} |
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[Theory] |
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[InlineData(TestImages.Jpeg.Baseline.Ycck)] |
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[InlineData(TestImages.Jpeg.Baseline.Cmyk)] |
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public void CalculateJpegChannelSize_4Chan(string imageFile) |
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{ |
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using (OrigJpegDecoderCore decoder = JpegFixture.ParseStream(imageFile)) |
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{ |
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Size expected = decoder.Components[0].SizeInBlocks() * 8; |
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foreach (OrigComponent component in decoder.Components) |
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{ |
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Size actual = component.CalculateJpegChannelSize(decoder.SubsampleRatio); |
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Assert.Equal(expected, actual); |
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} |
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} |
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} |
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} |
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} |
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@ -1,67 +0,0 @@ |
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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namespace SixLabors.ImageSharp.Tests.Formats.Jpg |
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{ |
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using SixLabors.ImageSharp.Formats.Jpeg.GolangPort.Components.Decoder; |
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using SixLabors.Primitives; |
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using Xunit; |
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using Xunit.Abstractions; |
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public class SubsampleRatioTests |
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{ |
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public SubsampleRatioTests(ITestOutputHelper output) |
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{ |
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this.Output = output; |
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} |
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private ITestOutputHelper Output { get; } |
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[Theory] |
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[InlineData(SubsampleRatio.Ratio410, 4, 2)] |
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[InlineData(SubsampleRatio.Ratio411, 4, 1)] |
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[InlineData(SubsampleRatio.Ratio420, 2, 2)] |
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[InlineData(SubsampleRatio.Ratio422, 2, 1)] |
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[InlineData(SubsampleRatio.Ratio440, 1, 2)] |
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[InlineData(SubsampleRatio.Ratio444, 1, 1)] |
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internal void CalculateChrominanceSize( |
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SubsampleRatio ratio, |
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int expectedDivX, |
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int expectedDivY) |
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{ |
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//this.Output.WriteLine($"RATIO: {ratio}");
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Size size = ratio.CalculateChrominanceSize(400, 400); |
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//this.Output.WriteLine($"Ch Size: {size}");
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Assert.Equal(new Size(400 / expectedDivX, 400 / expectedDivY), size); |
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} |
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[Theory] |
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[InlineData(SubsampleRatio.Ratio410, 4)] |
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[InlineData(SubsampleRatio.Ratio411, 4)] |
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[InlineData(SubsampleRatio.Ratio420, 2)] |
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[InlineData(SubsampleRatio.Ratio422, 2)] |
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[InlineData(SubsampleRatio.Ratio440, 1)] |
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[InlineData(SubsampleRatio.Ratio444, 1)] |
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internal void Create(SubsampleRatio ratio, int expectedCStrideDiv) |
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{ |
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this.Output.WriteLine($"RATIO: {ratio}"); |
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YCbCrImage img = new YCbCrImage(400, 400, ratio); |
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//this.PrintChannel("Y", img.YChannel);
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//this.PrintChannel("Cb", img.CbChannel);
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//this.PrintChannel("Cr", img.CrChannel);
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Assert.Equal(400, img.YChannel.Width); |
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Assert.Equal(img.CbChannel.Width, 400 / expectedCStrideDiv); |
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Assert.Equal(img.CrChannel.Width, 400 / expectedCStrideDiv); |
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} |
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private void PrintChannel(string name, OrigJpegPixelArea channel) |
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{ |
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this.Output.WriteLine($"{name}: Stride={channel.Stride}"); |
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} |
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} |
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} |
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