mirror of https://github.com/SixLabors/ImageSharp
Scott Williams
9 years ago
28 changed files with 351 additions and 258 deletions
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// <copyright file="GlowProcessor.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.Processing.Processors |
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{ |
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using System; |
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using System.Numerics; |
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using System.Threading.Tasks; |
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using ImageSharp.PixelFormats; |
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/// <summary>
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/// An <see cref="IImageProcessor{TPixel}"/> that applies a radial glow effect an <see cref="Image{TPixel}"/>.
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/// </summary>
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/// <typeparam name="TPixel">The pixel format.</typeparam>
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internal class GlowProcessorParallel<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="GlowProcessorParallel{TPixel}" /> class.
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/// </summary>
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/// <param name="color">The color or the glow.</param>
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public GlowProcessorParallel(TPixel color) |
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{ |
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this.GlowColor = color; |
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} |
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/// <summary>
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/// Gets or sets the glow color to apply.
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/// </summary>
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public TPixel GlowColor { get; set; } |
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/// <summary>
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/// Gets or sets the the radius.
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/// </summary>
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public float Radius { get; set; } |
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/// <inheritdoc/>
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protected override void OnApply(ImageBase<TPixel> source, Rectangle sourceRectangle) |
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{ |
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int startY = sourceRectangle.Y; |
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int endY = sourceRectangle.Bottom; |
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int startX = sourceRectangle.X; |
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int endX = sourceRectangle.Right; |
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TPixel glowColor = this.GlowColor; |
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Vector2 centre = Rectangle.Center(sourceRectangle).ToVector2(); |
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float maxDistance = this.Radius > 0 ? MathF.Min(this.Radius, sourceRectangle.Width * .5F) : sourceRectangle.Width * .5F; |
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// Align start/end positions.
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int minX = Math.Max(0, startX); |
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int maxX = Math.Min(source.Width, endX); |
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int minY = Math.Max(0, startY); |
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int maxY = Math.Min(source.Height, endY); |
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// Reset offset if necessary.
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if (minX > 0) |
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{ |
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startX = 0; |
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} |
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if (minY > 0) |
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{ |
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startY = 0; |
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} |
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int width = maxX - minX; |
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using (Buffer<TPixel> rowColors = new Buffer<TPixel>(width)) |
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using (PixelAccessor<TPixel> sourcePixels = source.Lock()) |
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{ |
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for (int i = 0; i < width; i++) |
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{ |
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rowColors[i] = glowColor; |
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} |
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Parallel.For( |
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minY, |
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maxY, |
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this.ParallelOptions, |
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y => |
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{ |
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int offsetY = y - startY; |
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for (int x = minX; x < maxX; x++) |
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{ |
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int offsetX = x - startX; |
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float distance = Vector2.Distance(centre, new Vector2(offsetX, offsetY)); |
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Vector4 sourceColor = sourcePixels[offsetX, offsetY].ToVector4(); |
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TPixel packed = default(TPixel); |
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packed.PackFromVector4(Vector4BlendTransforms.PremultipliedLerp(sourceColor, glowColor.ToVector4(), 1 - (.95F * (distance / maxDistance)))); |
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sourcePixels[offsetX, offsetY] = packed; |
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} |
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}); |
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} |
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} |
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} |
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} |
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@ -0,0 +1,56 @@ |
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// <copyright file="DrawImageEffectTest.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.Tests.Drawing |
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{ |
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using System; |
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using System.Linq; |
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using System.Collections.Generic; |
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using System.Text; |
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using ImageSharp.PixelFormats; |
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using Xunit; |
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public class BlendedShapes |
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{ |
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public static IEnumerable<object[]> modes = ((PixelBlenderMode[])Enum.GetValues(typeof(PixelBlenderMode))) |
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.Select(x=> new object[] { x }); |
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[Theory] |
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[WithBlankImages(nameof(modes), 100, 100, PixelTypes.StandardImageClass)] |
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public void DrawBlendedValues<TPixel>(TestImageProvider<TPixel> provider, PixelBlenderMode mode) |
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where TPixel : struct, IPixel<TPixel> |
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{ |
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using (var img = provider.GetImage()) |
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{ |
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img.Fill(NamedColors<TPixel>.DarkBlue, new Rectangle(0, 40, 100, 20)); |
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img.Fill(NamedColors<TPixel>.HotPink, new Rectangle(40, 0, 20, 100), new ImageSharp.GraphicsOptions(true) |
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{ |
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BlenderMode = mode |
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}); |
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img.DebugSave(provider, new { mode }); |
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} |
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} |
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[Theory] |
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[WithBlankImages(nameof(modes), 100, 100, PixelTypes.StandardImageClass)] |
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public void DrawBlendedValues_transparent<TPixel>(TestImageProvider<TPixel> provider, PixelBlenderMode mode) |
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where TPixel : struct, IPixel<TPixel> |
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{ |
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using (var img = provider.GetImage()) |
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{ |
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img.Fill(NamedColors<TPixel>.DarkBlue, new Rectangle(0, 40, 100, 20)); |
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img.Fill(NamedColors<TPixel>.HotPink, new Rectangle(20, 0, 40, 100), new ImageSharp.GraphicsOptions(true) |
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{ |
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BlenderMode = mode |
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}); |
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img.Fill(NamedColors<TPixel>.Transparent, new Rectangle(40, 0, 20, 100), new ImageSharp.GraphicsOptions(true) |
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{ |
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BlenderMode = mode |
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}); |
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img.DebugSave(provider, new { mode }); |
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} |
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} |
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} |
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} |
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