mirror of https://github.com/SixLabors/ImageSharp
Anton Firszov
7 years ago
4 changed files with 379 additions and 312 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.Buffers; |
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using System.Threading.Tasks; |
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using SixLabors.ImageSharp.Advanced; |
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using SixLabors.ImageSharp.Memory; |
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using SixLabors.ImageSharp.PixelFormats; |
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using SixLabors.Memory; |
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using SixLabors.Primitives; |
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namespace SixLabors.ImageSharp.Processing.Processors.Drawing |
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{ |
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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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// 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.Buffers; |
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using System.Threading.Tasks; |
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using SixLabors.ImageSharp.Advanced; |
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using SixLabors.ImageSharp.Memory; |
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using SixLabors.ImageSharp.ParallelUtils; |
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using SixLabors.ImageSharp.PixelFormats; |
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using SixLabors.Memory; |
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using SixLabors.Primitives; |
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namespace SixLabors.ImageSharp.Processing.Processors.Drawing |
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{ |
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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="TPixelDst">The pixel format of destination image.</typeparam>
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/// <typeparam name="TPixelSrc">The pixel format os source image.</typeparam>
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internal class DrawImageProcessor<TPixelDst, TPixelSrc> : ImageProcessor<TPixelDst> |
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/// <typeparam name="TPixelSrc">The pixel format os source image.</typeparam>
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internal class DrawImageProcessor<TPixelDst, TPixelSrc> : ImageProcessor<TPixelDst> |
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where TPixelDst : struct, IPixel<TPixelDst> |
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where TPixelSrc : struct, IPixel<TPixelSrc> |
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where TPixelSrc : struct, IPixel<TPixelSrc> |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="DrawImageProcessor{TPixelDst, TPixelSrc}"/> 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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/// <summary>
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/// Initializes a new instance of the <see cref="DrawImageProcessor{TPixelDst, TPixelSrc}"/> 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="location">The location to draw the blended image.</param>
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/// <param name="colorBlendingMode">The blending mode to use when drawing the image.</param>
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/// <param name="alphaCompositionMode">The Alpha blending mode to use when drawing the image.</param>
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/// <param name="opacity">The opacity of the image to blend. Must be between 0 and 1.</param>
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public DrawImageProcessor(Image<TPixelSrc> image, Point location, PixelColorBlendingMode colorBlendingMode, PixelAlphaCompositionMode alphaCompositionMode, float opacity) |
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{ |
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Guard.MustBeBetweenOrEqualTo(opacity, 0, 1, nameof(opacity)); |
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this.Image = image; |
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this.Opacity = opacity; |
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this.Blender = PixelOperations<TPixelDst>.Instance.GetPixelBlender(colorBlendingMode, alphaCompositionMode); |
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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<TPixelSrc> Image { get; } |
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/// <summary>
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/// Gets the opacity of the image to blend
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/// </summary>
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public float Opacity { get; } |
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/// <summary>
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/// Gets the pixel blender
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/// </summary>
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public PixelBlender<TPixelDst> Blender { 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 OnFrameApply(ImageFrame<TPixelDst> source, Rectangle sourceRectangle, Configuration configuration) |
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{ |
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Image<TPixelSrc> targetImage = this.Image; |
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PixelBlender<TPixelDst> blender = this.Blender; |
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int locationY = this.Location.Y; |
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// Align start/end positions.
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Rectangle bounds = targetImage.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 targetX = minX - this.Location.X; |
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int minY = Math.Max(this.Location.Y, sourceRectangle.Y); |
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int maxY = Math.Min(this.Location.Y + bounds.Height, sourceRectangle.Bottom); |
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int width = maxX - minX; |
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/// <param name="opacity">The opacity of the image to blend. Must be between 0 and 1.</param>
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public DrawImageProcessor(Image<TPixelSrc> image, Point location, PixelColorBlendingMode colorBlendingMode, PixelAlphaCompositionMode alphaCompositionMode, float opacity) |
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{ |
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Guard.MustBeBetweenOrEqualTo(opacity, 0, 1, nameof(opacity)); |
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this.Image = image; |
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this.Opacity = opacity; |
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this.Blender = PixelOperations<TPixelDst>.Instance.GetPixelBlender(colorBlendingMode, alphaCompositionMode); |
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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<TPixelSrc> Image { get; } |
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/// <summary>
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/// Gets the opacity of the image to blend
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/// </summary>
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public float Opacity { get; } |
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/// <summary>
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/// Gets the pixel blender
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/// </summary>
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public PixelBlender<TPixelDst> Blender { 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 OnFrameApply(ImageFrame<TPixelDst> source, Rectangle sourceRectangle, Configuration configuration) |
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{ |
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Image<TPixelSrc> targetImage = this.Image; |
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PixelBlender<TPixelDst> blender = this.Blender; |
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int locationY = this.Location.Y; |
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// Align start/end positions.
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Rectangle bounds = targetImage.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 targetX = minX - this.Location.X; |
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int minY = Math.Max(this.Location.Y, sourceRectangle.Y); |
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int maxY = Math.Min(this.Location.Y + bounds.Height, sourceRectangle.Bottom); |
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int width = maxX - minX; |
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MemoryAllocator memoryAllocator = this.Image.GetConfiguration().MemoryAllocator; |
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ParallelFor.WithConfiguration( |
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minY, |
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maxY, |
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configuration, |
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y => |
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{ |
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Span<TPixelDst> background = source.GetPixelRowSpan(y).Slice(minX, width); |
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Span<TPixelSrc> foreground = targetImage.GetPixelRowSpan(y - locationY).Slice(targetX, width); |
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blender.Blend<TPixelSrc>(memoryAllocator, background, background, foreground, this.Opacity); |
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}); |
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} |
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} |
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var workingRect = Rectangle.FromLTRB(minX, minY, maxX, maxY); |
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ParallelHelper.IterateRows( |
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workingRect, |
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configuration, |
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rows => |
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{ |
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for (int y = rows.Min; y < rows.Max; y++) |
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{ |
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Span<TPixelDst> background = source.GetPixelRowSpan(y).Slice(minX, width); |
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Span<TPixelSrc> foreground = |
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targetImage.GetPixelRowSpan(y - locationY).Slice(targetX, width); |
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blender.Blend<TPixelSrc>(memoryAllocator, background, background, foreground, this.Opacity); |
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} |
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}); |
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} |
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} |
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} |
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