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77 lines
3.8 KiB
77 lines
3.8 KiB
// 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 SixLabors.ImageSharp.Processing.Processors.Dithering;
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namespace SixLabors.ImageSharp.Processing
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{
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/// <summary>
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/// Defines dithering extensions to apply on an <see cref="Image"/>
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/// using Mutate/Clone.
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/// </summary>
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public static class DitherExtensions
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{
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/// <summary>
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/// Dithers the image reducing it to a web-safe palette using Bayer4x4 ordered dithering.
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/// </summary>
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/// <param name="source">The image this method extends.</param>
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/// <returns>The <see cref="IImageProcessingContext"/> to allow chaining of operations.</returns>
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public static IImageProcessingContext Dither(this IImageProcessingContext source) =>
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Dither(source, KnownDitherings.BayerDither4x4);
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/// <summary>
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/// Dithers the image reducing it to a web-safe palette using ordered dithering.
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/// </summary>
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/// <param name="source">The image this method extends.</param>
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/// <param name="dither">The ordered ditherer.</param>
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/// <returns>The <see cref="IImageProcessingContext"/> to allow chaining of operations.</returns>
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public static IImageProcessingContext Dither(this IImageProcessingContext source, IDither dither) =>
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source.ApplyProcessor(new PaletteDitherProcessor(dither));
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/// <summary>
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/// Dithers the image reducing it to the given palette using ordered dithering.
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/// </summary>
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/// <param name="source">The image this method extends.</param>
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/// <param name="dither">The ordered ditherer.</param>
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/// <param name="palette">The palette to select substitute colors from.</param>
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/// <returns>The <see cref="IImageProcessingContext"/> to allow chaining of operations.</returns>
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public static IImageProcessingContext Dither(
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this IImageProcessingContext source,
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IDither dither,
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ReadOnlyMemory<Color> palette) =>
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source.ApplyProcessor(new PaletteDitherProcessor(dither, palette));
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/// <summary>
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/// Dithers the image reducing it to a web-safe palette using ordered dithering.
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/// </summary>
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/// <param name="source">The image this method extends.</param>
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/// <param name="dither">The ordered ditherer.</param>
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/// <param name="rectangle">
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/// The <see cref="Rectangle"/> structure that specifies the portion of the image object to alter.
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/// </param>
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/// <returns>The <see cref="IImageProcessingContext"/> to allow chaining of operations.</returns>
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public static IImageProcessingContext Dither(
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this IImageProcessingContext source,
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IDither dither,
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Rectangle rectangle) =>
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source.ApplyProcessor(new PaletteDitherProcessor(dither), rectangle);
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/// <summary>
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/// Dithers the image reducing it to the given palette using ordered dithering.
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/// </summary>
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/// <param name="source">The image this method extends.</param>
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/// <param name="dither">The ordered ditherer.</param>
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/// <param name="palette">The palette to select substitute colors from.</param>
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/// <param name="rectangle">
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/// The <see cref="Rectangle"/> structure that specifies the portion of the image object to alter.
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/// </param>
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/// <returns>The <see cref="IImageProcessingContext"/> to allow chaining of operations.</returns>
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public static IImageProcessingContext Dither(
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this IImageProcessingContext source,
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IDither dither,
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ReadOnlyMemory<Color> palette,
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Rectangle rectangle) =>
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source.ApplyProcessor(new PaletteDitherProcessor(dither, palette), rectangle);
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}
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}
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