mirror of https://github.com/SixLabors/ImageSharp
Anton Firszov
10 years ago
114 changed files with 313 additions and 262 deletions
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// <copyright file="BlendProcessor.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.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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/// <summary>
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/// Combines two images together by blending the pixels.
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/// </summary>
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/// <typeparam name="TColor">The pixel format.</typeparam>
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/// <typeparam name="TPacked">The packed format. <example>uint, long, float.</example></typeparam>
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public class BlendProcessor<TColor, TPacked> : ImageFilter<TColor, TPacked> |
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where TColor : struct, IPackedPixel<TPacked> |
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where TPacked : struct |
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{ |
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/// <summary>
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/// The image to blend.
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/// </summary>
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private readonly ImageBase<TColor, TPacked> blend; |
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/// <summary>
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/// Initializes a new instance of the <see cref="BlendProcessor{T,TP}"/> class.
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/// </summary>
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/// <param name="image">
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/// The image to blend with the currently processing image.
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/// Disposal of this image is the responsibility of the developer.
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/// </param>
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/// <param name="alpha">The opacity of the image to blend. Between 0 and 100.</param>
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public BlendProcessor(ImageBase<TColor, TPacked> image, int alpha = 100) |
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{ |
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Guard.MustBeBetweenOrEqualTo(alpha, 0, 100, nameof(alpha)); |
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this.blend = image; |
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this.Value = alpha; |
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} |
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/// <summary>
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/// Gets the alpha percentage value.
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/// </summary>
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public int Value { get; } |
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/// <inheritdoc/>
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protected override void Apply(ImageBase<TColor, TPacked> source, Rectangle sourceRectangle, int startY, int endY) |
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{ |
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int startX = sourceRectangle.X; |
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int endX = sourceRectangle.Right; |
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Rectangle bounds = this.blend.Bounds; |
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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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float alpha = this.Value / 100F; |
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using (PixelAccessor<TColor, TPacked> toBlendPixels = this.blend.Lock()) |
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using (PixelAccessor<TColor, TPacked> sourcePixels = source.Lock()) |
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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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Vector4 color = sourcePixels[offsetX, offsetY].ToVector4(); |
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if (bounds.Contains(offsetX, offsetY)) |
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{ |
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Vector4 blendedColor = toBlendPixels[offsetX, offsetY].ToVector4(); |
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if (blendedColor.W > 0) |
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{ |
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// Lerping colors is dependent on the alpha of the blended color
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color = Vector4.Lerp(color, blendedColor, alpha > 0 ? alpha : blendedColor.W); |
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} |
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} |
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TColor packed = default(TColor); |
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packed.PackFromVector4(color); |
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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 +1,99 @@ |
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// <copyright file="BlendProcessor.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.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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/// <summary>
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/// Combines two images together by blending the pixels.
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/// </summary>
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/// <typeparam name="TColor">The pixel format.</typeparam>
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/// <typeparam name="TPacked">The packed format. <example>uint, long, float.</example></typeparam>
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public class BlendProcessor<TColor, TPacked> : ImageFilteringProcessor<TColor, TPacked> |
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where TColor : struct, IPackedPixel<TPacked> |
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where TPacked : struct |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="BlendProcessor{TColor,TPacked}"/> class.
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/// </summary>
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/// <param name="image">The image to blend with the currently processing image.</param>
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/// <param name="size">The size to draw the blended image.</param>
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/// <param name="location">The location to draw the blended image.</param>
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/// <param name="alpha">The opacity of the image to blend. Between 0 and 100.</param>
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public BlendProcessor(Image<TColor, TPacked> image, Size size, Point location, int alpha = 100) |
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{ |
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Guard.MustBeBetweenOrEqualTo(alpha, 0, 100, nameof(alpha)); |
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this.Image = image; |
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this.Size = size; |
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this.Alpha = alpha; |
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this.Location = location; |
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} |
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/// <summary>
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/// Gets the image to blend.
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/// </summary>
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public Image<TColor, TPacked> Image { get; private set; } |
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/// <summary>
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/// Gets the alpha percentage value.
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/// </summary>
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public int Alpha { get; } |
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/// <summary>
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/// Gets the size to draw the blended image.
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/// </summary>
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public Size Size { get; } |
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/// <summary>
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/// Gets the location to draw the blended image.
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/// </summary>
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public Point Location { get; } |
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/// <inheritdoc/>
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protected override void Apply(ImageBase<TColor, TPacked> source, Rectangle sourceRectangle, int startY, int endY) |
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{ |
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if (this.Image.Bounds.Size != this.Size) |
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{ |
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this.Image = this.Image.Resize(this.Size.Width, this.Size.Height); |
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} |
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// Align start/end positions.
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Rectangle bounds = this.Image.Bounds; |
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int minX = Math.Max(this.Location.X, sourceRectangle.X); |
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int maxX = Math.Min(this.Location.X + bounds.Width, sourceRectangle.Width); |
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int minY = Math.Max(this.Location.Y, startY); |
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int maxY = Math.Min(this.Location.Y + bounds.Height, endY); |
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float alpha = this.Alpha / 100F; |
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using (PixelAccessor<TColor, TPacked> toBlendPixels = this.Image.Lock()) |
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using (PixelAccessor<TColor, TPacked> sourcePixels = source.Lock()) |
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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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for (int x = minX; x < maxX; x++) |
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{ |
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Vector4 backgroundVector = sourcePixels[x, y].ToVector4(); |
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Vector4 sourceVector = toBlendPixels[x - minX, y - minY].ToVector4(); |
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// Lerping colors is dependent on the alpha of the blended color
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backgroundVector = Vector4BlendTransforms.PremultipliedLerp(backgroundVector, sourceVector, alpha); |
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TColor packed = default(TColor); |
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packed.PackFromVector4(backgroundVector); |
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sourcePixels[x, y] = 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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