mirror of https://github.com/SixLabors/ImageSharp
Scott Williams
9 years ago
87 changed files with 573 additions and 303 deletions
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// <copyright file="OrderedDither4x4.cs" company="James Jackson-South">
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// Copyright (c) James Jackson-South and contributors.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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namespace ImageSharp.Dithering.Ordered |
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{ |
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/// <summary>
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/// The base class for performing ordered ditheroing using a 4x4 matrix.
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/// </summary>
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public abstract class OrderedDither4x4 : IOrderedDither |
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{ |
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/// <summary>
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/// The dithering matrix
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/// </summary>
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private Fast2DArray<byte> matrix; |
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/// <summary>
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/// Initializes a new instance of the <see cref="OrderedDither4x4"/> class.
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/// </summary>
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/// <param name="matrix">The thresholding matrix. </param>
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internal OrderedDither4x4(Fast2DArray<byte> matrix) |
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{ |
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this.matrix = matrix; |
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} |
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/// <inheritdoc />
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public void Dither<TColor>(PixelAccessor<TColor> pixels, TColor source, TColor upper, TColor lower, byte[] bytes, int index, int x, int y, int width, int height) |
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where TColor : struct, IPixel<TColor> |
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{ |
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// TODO: This doesn't really cut it for me.
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// I'd rather be using float but we need to add some sort of movalization vector methods to all IPixel implementations
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// before we can do that as the vectors all cover different ranges.
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source.ToXyzwBytes(bytes, 0); |
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pixels[x, y] = this.matrix[y % 3, x % 3] >= bytes[index] ? lower : upper; |
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} |
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} |
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} |
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// <copyright file="EncodeIndexedPng.cs" company="James Jackson-South">
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// Copyright (c) James Jackson-South and contributors.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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namespace ImageSharp.Benchmarks.Image |
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{ |
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using System.IO; |
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using BenchmarkDotNet.Attributes; |
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using ImageSharp; |
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using ImageSharp.Formats; |
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using ImageSharp.Quantizers; |
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/// <summary>
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/// Benchmarks saving png files using different quantizers. System.Drawing cannot save indexed png files so we cannot compare.
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/// </summary>
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public class EncodeIndexedPng : BenchmarkBase |
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{ |
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// System.Drawing needs this.
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private Stream bmpStream; |
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private Image bmpCore; |
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[Params(false)] |
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public bool LargeImage { get; set; } |
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[Setup] |
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public void ReadImages() |
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{ |
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if (this.bmpStream == null) |
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{ |
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string path = this.LargeImage |
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? "../ImageSharp.Tests/TestImages/Formats/Jpg/baseline/jpeg420exif.jpg" |
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: "../ImageSharp.Tests/TestImages/Formats/Bmp/Car.bmp"; |
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this.bmpStream = File.OpenRead(path); |
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this.bmpCore = new Image(this.bmpStream); |
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this.bmpStream.Position = 0; |
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} |
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} |
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[Cleanup] |
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public void Cleanup() |
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{ |
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this.bmpStream.Dispose(); |
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this.bmpCore.Dispose(); |
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} |
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[Benchmark(Baseline = true, Description = "ImageSharp Octree Png")] |
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public void PngCoreOctree() |
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{ |
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using (MemoryStream memoryStream = new MemoryStream()) |
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{ |
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PngEncoderOptions options = new PngEncoderOptions() { Quantizer = new OctreeQuantizer<Color>(), Quality = 256 }; |
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this.bmpCore.SaveAsPng(memoryStream, options); |
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} |
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} |
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[Benchmark(Description = "ImageSharp Octree NoDither Png")] |
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public void PngCoreOctreeNoDIther() |
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{ |
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using (MemoryStream memoryStream = new MemoryStream()) |
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{ |
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PngEncoderOptions options = new PngEncoderOptions { Quantizer = new OctreeQuantizer<Color> { Dither = false }, Quality = 256 }; |
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this.bmpCore.SaveAsPng(memoryStream, options); |
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} |
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} |
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[Benchmark(Description = "ImageSharp Palette Png")] |
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public void PngCorePalette() |
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{ |
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using (MemoryStream memoryStream = new MemoryStream()) |
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{ |
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PngEncoderOptions options = new PngEncoderOptions { Quantizer = new PaletteQuantizer<Color>(), Quality = 256 }; |
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this.bmpCore.SaveAsPng(memoryStream, options); |
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} |
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} |
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[Benchmark(Description = "ImageSharp Palette NoDither Png")] |
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public void PngCorePaletteNoDither() |
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{ |
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using (MemoryStream memoryStream = new MemoryStream()) |
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{ |
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PngEncoderOptions options = new PngEncoderOptions { Quantizer = new PaletteQuantizer<Color> { Dither = false }, Quality = 256 }; |
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this.bmpCore.SaveAsPng(memoryStream, options); |
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} |
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} |
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[Benchmark(Description = "ImageSharp Wu Png")] |
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public void PngCoreWu() |
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{ |
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using (MemoryStream memoryStream = new MemoryStream()) |
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{ |
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PngEncoderOptions options = new PngEncoderOptions() { Quantizer = new WuQuantizer<Color>(), Quality = 256 }; |
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this.bmpCore.SaveAsPng(memoryStream, options); |
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} |
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} |
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} |
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} |
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