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86 lines
3.5 KiB
86 lines
3.5 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.Advanced.Unsafe;
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using SixLabors.ImageSharp.Memory;
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using SixLabors.ImageSharp.PixelFormats;
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namespace SixLabors.ImageSharp.Drawing.Brushes.Processors
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{
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/// <summary>
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/// primitive that converts a point in to a color for discovering the fill color based on an implementation
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/// </summary>
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/// <typeparam name="TPixel">The pixel format.</typeparam>
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/// <seealso cref="System.IDisposable" />
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public abstract class BrushApplicator<TPixel> : IDisposable // disposable will be required if/when there is an ImageBrush
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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="BrushApplicator{TPixel}"/> class.
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/// </summary>
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/// <param name="target">The target.</param>
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/// <param name="options">The options.</param>
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internal BrushApplicator(ImageBase<TPixel> target, GraphicsOptions options)
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{
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this.Target = target;
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this.Options = options;
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this.Blender = PixelOperations<TPixel>.Instance.GetPixelBlender(options.BlenderMode);
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}
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/// <summary>
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/// Gets the blendder
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/// </summary>
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internal PixelBlender<TPixel> Blender { get; }
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/// <summary>
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/// Gets the destinaion
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/// </summary>
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protected ImageBase<TPixel> Target { get; }
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/// <summary>
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/// Gets the blend percentage
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/// </summary>
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protected GraphicsOptions Options { get; private set; }
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/// <summary>
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/// Gets the color for a single pixel.
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/// </summary>
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/// <param name="x">The x cordinate.</param>
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/// <param name="y">The y cordinate.</param>
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/// <returns>The a <typeparamref name="TPixel"/> that should be applied to the pixel.</returns>
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internal abstract TPixel this[int x, int y] { get; }
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/// <inheritdoc/>
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public abstract void Dispose();
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/// <summary>
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/// Applies the opactiy weighting for each pixel in a scanline to the target based on the pattern contained in the brush.
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/// </summary>
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/// <param name="scanline">The a collection of opacity values between 0 and 1 to be merged with the brushed color value before being applied to the target.</param>
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/// <param name="x">The x position in the target pixel space that the start of the scanline data corresponds to.</param>
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/// <param name="y">The y position in the target pixel space that whole scanline corresponds to.</param>
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/// <remarks>scanlineBuffer will be > scanlineWidth but provide and offset in case we want to share a larger buffer across runs.</remarks>
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internal virtual void Apply(Span<float> scanline, int x, int y)
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{
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using (var amountBuffer = new Buffer<float>(scanline.Length))
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using (var overlay = new Buffer<TPixel>(scanline.Length))
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{
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for (int i = 0; i < scanline.Length; i++)
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{
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if (this.Options.BlendPercentage < 1)
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{
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amountBuffer[i] = scanline[i] * this.Options.BlendPercentage;
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}
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overlay[i] = this[x + i, y];
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}
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Span<TPixel> destinationRow = this.Target.GetPixelRowSpan(x).Slice(y, scanline.Length);
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this.Blender.Blend(destinationRow, destinationRow, overlay, amountBuffer);
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}
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}
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}
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}
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