mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
8 years ago
79 changed files with 266 additions and 220 deletions
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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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using System; |
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using System.Threading.Tasks; |
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using SixLabors.ImageSharp.Memory; |
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using SixLabors.ImageSharp.PixelFormats; |
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using SixLabors.ImageSharp.Processing.Processors; |
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using SixLabors.Primitives; |
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namespace SixLabors.ImageSharp.Processing.Quantization.Processors |
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{ |
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/// <summary>
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/// Enables the quantization of images to remove the number of colors used in the image palette.
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/// </summary>
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/// <typeparam name="TPixel">The pixel format.</typeparam>
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internal class QuantizeProcessor<TPixel> : ImageProcessor<TPixel> |
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where TPixel : struct, IPixel<TPixel> |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="QuantizeProcessor{TPixel}"/> class.
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/// </summary>
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/// <param name="quantizer">The quantizer used to reduce the color palette</param>
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/// <param name="maxColors">The maximum number of colors to reduce the palette to</param>
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public QuantizeProcessor(IQuantizer<TPixel> quantizer, int maxColors) |
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{ |
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Guard.NotNull(quantizer, nameof(quantizer)); |
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Guard.MustBeGreaterThan(maxColors, 0, nameof(maxColors)); |
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this.Quantizer = quantizer; |
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this.MaxColors = maxColors; |
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} |
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/// <summary>
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/// Gets the quantizer
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/// </summary>
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public IQuantizer<TPixel> Quantizer { get; } |
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/// <summary>
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/// Gets the maximum number of palette colors
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/// </summary>
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public int MaxColors { get; } |
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/// <inheritdoc />
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protected override void OnFrameApply(ImageFrame<TPixel> source, Rectangle sourceRectangle, Configuration configuration) |
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{ |
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QuantizedFrame<TPixel> quantized = this.Quantizer.Quantize(source, this.MaxColors); |
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int paletteCount = quantized.Palette.Length - 1; |
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using (Buffer2D<TPixel> pixels = source.MemoryManager.Allocate2D<TPixel>(quantized.Width, quantized.Height)) |
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{ |
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Parallel.For( |
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0, |
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pixels.Height, |
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configuration.ParallelOptions, |
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y => |
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{ |
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Span<TPixel> row = pixels.GetRowSpan(y); |
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int yy = y * pixels.Width; |
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for (int x = 0; x < pixels.Width; x++) |
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{ |
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int i = x + yy; |
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TPixel color = quantized.Palette[Math.Min(paletteCount, quantized.Pixels[i])]; |
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row[x] = color; |
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} |
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}); |
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Buffer2D<TPixel>.SwapContents(source.PixelBuffer, pixels); |
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} |
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} |
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} |
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} |
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@ -1,12 +1,12 @@ |
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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 |
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namespace SixLabors.ImageSharp.Processing.Quantization |
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{ |
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/// <summary>
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/// Provides enumeration over how an image should be quantized.
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/// </summary>
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public enum Quantization |
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public enum QuantizationMode |
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{ |
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/// <summary>
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/// An adaptive Octree quantizer. Fast with good quality.
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