mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
7 years ago
7 changed files with 611 additions and 165 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.Collections.Generic; |
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using System.Linq; |
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using System.Numerics; |
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using System.Runtime.CompilerServices; |
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using System.Runtime.InteropServices; |
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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.Transforms |
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{ |
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/// <summary>
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/// Provides the base methods to perform affine transforms on an image.
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/// </summary>
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/// <typeparam name="TPixel">The pixel format.</typeparam>
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internal class AffineTransformProcessorOld<TPixel> : InterpolatedTransformProcessorBase<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="AffineTransformProcessorOld{TPixel}"/> class.
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/// </summary>
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/// <param name="matrix">The transform matrix</param>
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/// <param name="sampler">The sampler to perform the transform operation.</param>
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/// <param name="targetDimensions">The target dimensions to constrain the transformed image to.</param>
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public AffineTransformProcessorOld(Matrix3x2 matrix, IResampler sampler, Size targetDimensions) |
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: base(sampler) |
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{ |
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this.TransformMatrix = matrix; |
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this.TargetDimensions = targetDimensions; |
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} |
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/// <summary>
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/// Gets the matrix used to supply the affine transform
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/// </summary>
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public Matrix3x2 TransformMatrix { get; } |
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/// <summary>
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/// Gets the target dimensions to constrain the transformed image to
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/// </summary>
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public Size TargetDimensions { get; } |
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/// <inheritdoc/>
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protected override Image<TPixel> CreateDestination(Image<TPixel> source, Rectangle sourceRectangle) |
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{ |
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// We will always be creating the clone even for mutate because we may need to resize the canvas
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IEnumerable<ImageFrame<TPixel>> frames = |
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source.Frames.Select(x => new ImageFrame<TPixel>(source.GetConfiguration(), this.TargetDimensions, x.MetaData.DeepClone())); |
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// Use the overload to prevent an extra frame being added
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return new Image<TPixel>(source.GetConfiguration(), source.MetaData.DeepClone(), frames); |
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} |
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/// <inheritdoc/>
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protected override void OnFrameApply( |
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ImageFrame<TPixel> source, |
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ImageFrame<TPixel> destination, |
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Rectangle sourceRectangle, |
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Configuration configuration) |
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{ |
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int height = this.TargetDimensions.Height; |
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int width = this.TargetDimensions.Width; |
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Rectangle sourceBounds = source.Bounds(); |
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var targetBounds = new Rectangle(0, 0, width, height); |
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// Since could potentially be resizing the canvas we might need to re-calculate the matrix
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Matrix3x2 matrix = this.GetProcessingMatrix(sourceBounds, targetBounds); |
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// Convert from screen to world space.
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Matrix3x2.Invert(matrix, out matrix); |
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if (this.Sampler is NearestNeighborResampler) |
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{ |
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ParallelHelper.IterateRows( |
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targetBounds, |
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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<TPixel> destRow = destination.GetPixelRowSpan(y); |
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for (int x = 0; x < width; x++) |
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{ |
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var point = Point.Transform(new Point(x, y), matrix); |
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if (sourceBounds.Contains(point.X, point.Y)) |
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{ |
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destRow[x] = source[point.X, point.Y]; |
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} |
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} |
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} |
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}); |
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return; |
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} |
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int maxSourceX = source.Width - 1; |
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int maxSourceY = source.Height - 1; |
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(float radius, float scale, float ratio) xRadiusScale = this.GetSamplingRadius(source.Width, destination.Width); |
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(float radius, float scale, float ratio) yRadiusScale = this.GetSamplingRadius(source.Height, destination.Height); |
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float xScale = xRadiusScale.scale; |
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float yScale = yRadiusScale.scale; |
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var radius = new Vector2(xRadiusScale.radius, yRadiusScale.radius); |
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IResampler sampler = this.Sampler; |
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var maxSource = new Vector4(maxSourceX, maxSourceY, maxSourceX, maxSourceY); |
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int xLength = (int)MathF.Ceiling((radius.X * 2) + 2); |
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int yLength = (int)MathF.Ceiling((radius.Y * 2) + 2); |
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MemoryAllocator memoryAllocator = configuration.MemoryAllocator; |
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using (Buffer2D<float> yBuffer = memoryAllocator.Allocate2D<float>(yLength, height)) |
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using (Buffer2D<float> xBuffer = memoryAllocator.Allocate2D<float>(xLength, height)) |
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{ |
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ParallelHelper.IterateRows( |
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targetBounds, |
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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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ref TPixel destRowRef = ref MemoryMarshal.GetReference(destination.GetPixelRowSpan(y)); |
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ref float ySpanRef = ref MemoryMarshal.GetReference(yBuffer.GetRowSpan(y)); |
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ref float xSpanRef = ref MemoryMarshal.GetReference(xBuffer.GetRowSpan(y)); |
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for (int x = 0; x < width; x++) |
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{ |
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// Use the single precision position to calculate correct bounding pixels
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// otherwise we get rogue pixels outside of the bounds.
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var point = Vector2.Transform(new Vector2(x, y), matrix); |
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// Clamp sampling pixel radial extents to the source image edges
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Vector2 maxXY = point + radius; |
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Vector2 minXY = point - radius; |
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// max, maxY, minX, minY
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var extents = new Vector4( |
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MathF.Floor(maxXY.X + .5F), |
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MathF.Floor(maxXY.Y + .5F), |
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MathF.Ceiling(minXY.X - .5F), |
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MathF.Ceiling(minXY.Y - .5F)); |
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int right = (int)extents.X; |
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int bottom = (int)extents.Y; |
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int left = (int)extents.Z; |
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int top = (int)extents.W; |
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extents = Vector4.Clamp(extents, Vector4.Zero, maxSource); |
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int maxX = (int)extents.X; |
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int maxY = (int)extents.Y; |
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int minX = (int)extents.Z; |
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int minY = (int)extents.W; |
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if (minX == maxX || minY == maxY) |
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{ |
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continue; |
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} |
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// It appears these have to be calculated on-the-fly.
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// Precalculating transformed weights would require prior knowledge of every transformed pixel location
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// since they can be at sub-pixel positions on both axis.
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// I've optimized where I can but am always open to suggestions.
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if (yScale > 1 && xScale > 1) |
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{ |
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CalculateWeightsDown( |
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top, |
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bottom, |
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minY, |
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maxY, |
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point.Y, |
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sampler, |
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yScale, |
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ref ySpanRef, |
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yLength); |
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CalculateWeightsDown( |
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left, |
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right, |
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minX, |
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maxX, |
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point.X, |
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sampler, |
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xScale, |
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ref xSpanRef, |
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xLength); |
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} |
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else |
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{ |
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CalculateWeightsScaleUp(minY, maxY, point.Y, sampler, ref ySpanRef); |
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CalculateWeightsScaleUp(minX, maxX, point.X, sampler, ref xSpanRef); |
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} |
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// Now multiply the results against the offsets
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Vector4 sum = Vector4.Zero; |
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for (int yy = 0, j = minY; j <= maxY; j++, yy++) |
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{ |
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float yWeight = Unsafe.Add(ref ySpanRef, yy); |
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for (int xx = 0, i = minX; i <= maxX; i++, xx++) |
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{ |
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float xWeight = Unsafe.Add(ref xSpanRef, xx); |
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// Values are first premultiplied to prevent darkening of edge pixels
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var current = source[i, j].ToVector4(); |
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Vector4Utils.Premultiply(ref current); |
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sum += current * xWeight * yWeight; |
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} |
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} |
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ref TPixel dest = ref Unsafe.Add(ref destRowRef, x); |
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// Reverse the premultiplication
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Vector4Utils.UnPremultiply(ref sum); |
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dest.FromVector4(sum); |
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} |
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} |
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}); |
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} |
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} |
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/// <summary>
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/// Gets a transform matrix adjusted for final processing based upon the target image bounds.
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/// </summary>
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/// <param name="sourceRectangle">The source image bounds.</param>
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/// <param name="destinationRectangle">The destination image bounds.</param>
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/// <returns>
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/// The <see cref="Matrix3x2"/>.
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/// </returns>
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protected virtual Matrix3x2 GetProcessingMatrix(Rectangle sourceRectangle, Rectangle destinationRectangle) |
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=> this.TransformMatrix; |
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} |
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} |
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@ -0,0 +1,188 @@ |
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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.Numerics; |
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using System.Runtime.CompilerServices; |
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using System.Runtime.InteropServices; |
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using SixLabors.ImageSharp.Memory; |
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using SixLabors.ImageSharp.PixelFormats; |
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using SixLabors.Primitives; |
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// TODO: It would be great if we could somehow optimize this to calculate the weights once.
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// currently we cannot do that as we are calulating the weight of the transformed point dimension
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// not the point in the original image.
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namespace SixLabors.ImageSharp.Processing.Processors.Transforms |
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{ |
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/// <summary>
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/// Contains the methods required to calculate kernel sampling weights on-the-fly.
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/// </summary>
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internal class TransformKernelMap : IDisposable |
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{ |
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private readonly Buffer2D<float> yBuffer; |
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private readonly Buffer2D<float> xBuffer; |
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private readonly float yScale; |
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private readonly float xScale; |
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private readonly int yLength; |
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private readonly int xLength; |
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private readonly Vector2 extents; |
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private Vector4 maxSourceExtents; |
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private readonly IResampler sampler; |
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/// <summary>
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/// Initializes a new instance of the <see cref="TransformKernelMap"/> class.
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/// </summary>
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/// <param name="configuration">The configuration.</param>
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/// <param name="source">The source size.</param>
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/// <param name="destination">The destination size.</param>
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/// <param name="sampler">The sampler.</param>
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public TransformKernelMap(Configuration configuration, Size source, Size destination, IResampler sampler) |
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{ |
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this.sampler = sampler; |
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(float radius, float scale) yRadiusScale = this.GetSamplingRadius(source.Height, destination.Height); |
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(float radius, float scale) xRadiusScale = this.GetSamplingRadius(source.Width, destination.Width); |
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this.yScale = yRadiusScale.scale; |
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this.xScale = xRadiusScale.scale; |
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this.extents = new Vector2(xRadiusScale.radius, yRadiusScale.radius); |
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this.xLength = (int)MathF.Ceiling((this.extents.X * 2) + 2); |
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this.yLength = (int)MathF.Ceiling((this.extents.Y * 2) + 2); |
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// We use 2D buffers so that we can access the weight spans in parallel.
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this.yBuffer = configuration.MemoryAllocator.Allocate2D<float>(this.yLength, destination.Height); |
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this.xBuffer = configuration.MemoryAllocator.Allocate2D<float>(this.xLength, destination.Height); |
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int maxX = source.Width - 1; |
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int maxY = source.Height - 1; |
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this.maxSourceExtents = new Vector4(maxX, maxY, maxX, maxY); |
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} |
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/// <summary>
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/// Gets a reference to the first item of the y window.
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/// </summary>
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/// <returns>The reference to the first item of the window.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public ref float GetYStartReference(int y) |
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=> ref MemoryMarshal.GetReference(this.yBuffer.GetRowSpan(y)); |
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/// <summary>
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/// Gets a reference to the first item of the x window.
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/// </summary>
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/// <returns>The reference to the first item of the window.</returns>
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[MethodImpl(InliningOptions.ShortMethod)] |
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public ref float GetXStartReference(int y) |
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=> ref MemoryMarshal.GetReference(this.xBuffer.GetRowSpan(y)); |
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public void Convolve<TPixel>( |
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Vector2 transformedPoint, |
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int column, |
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ref float ySpanRef, |
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ref float xSpanRef, |
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Buffer2D<TPixel> sourcePixels, |
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Span<Vector4> targetRow) |
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where TPixel : struct, IPixel<TPixel> |
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{ |
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// Clamp sampling pixel radial extents to the source image edges
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Vector2 minXY = transformedPoint - this.extents; |
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Vector2 maxXY = transformedPoint + this.extents; |
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// minX, minY, maxX, maxY
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var extents = new Vector4( |
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MathF.Ceiling(minXY.X - .5F), |
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MathF.Ceiling(minXY.Y - .5F), |
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MathF.Floor(maxXY.X + .5F), |
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MathF.Floor(maxXY.Y + .5F)); |
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int left = (int)extents.X; |
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int top = (int)extents.Y; |
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int right = (int)extents.Z; |
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int bottom = (int)extents.W; |
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extents = Vector4.Clamp(extents, Vector4.Zero, this.maxSourceExtents); |
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int minX = (int)extents.X; |
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int minY = (int)extents.Y; |
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int maxX = (int)extents.Z; |
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int maxY = (int)extents.W; |
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if (minX == maxX || minY == maxY) |
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{ |
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return; |
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} |
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// TODO: Get Anton to use his superior brain on this one.
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// It looks to me like we're calculating the same weights over and over again
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// since min(X+Y) and max(X+Y) are the same distance apart.
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this.CalculateWeights(minY, maxY, maxY - minY, transformedPoint.Y, ref ySpanRef); |
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this.CalculateWeights(minX, maxX, maxX - minX, transformedPoint.X, ref xSpanRef); |
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Vector4 sum = Vector4.Zero; |
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for (int kernelY = 0, y = minY; y <= maxY; y++, kernelY++) |
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{ |
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float yWeight = Unsafe.Add(ref ySpanRef, kernelY); |
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for (int kernelX = 0, x = minX; x <= maxX; x++, kernelX++) |
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{ |
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float xWeight = Unsafe.Add(ref xSpanRef, kernelX); |
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// Values are first premultiplied to prevent darkening of edge pixels.
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var current = sourcePixels[x, y].ToVector4(); |
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Vector4Utils.Premultiply(ref current); |
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sum += current * xWeight * yWeight; |
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} |
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} |
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// Reverse the premultiplication
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Vector4Utils.UnPremultiply(ref sum); |
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targetRow[column] = sum; |
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} |
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/// <summary>
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/// Calculated the normalized weights for the given point.
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/// </summary>
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/// <param name="min">The minimum sampling offset</param>
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/// <param name="max">The maximum sampling offset</param>
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/// <param name="length">The length of the weights collection</param>
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/// <param name="point">The transformed point dimension</param>
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/// <param name="weightsRef">The reference to the collection of weights</param>
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[MethodImpl(InliningOptions.ShortMethod)] |
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private void CalculateWeights(int min, int max, int length, float point, ref float weightsRef) |
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{ |
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float sum = 0; |
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for (int x = 0, i = min; i <= max; i++, x++) |
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{ |
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float weight = this.sampler.GetValue(i - point); |
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sum += weight; |
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Unsafe.Add(ref weightsRef, x) = this.sampler.GetValue(i - point); |
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} |
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// TODO: Do we need this? Check what happens when we scale an image down.
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// if (sum > 0)
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// {
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// for (int i = 0; i < length; i++)
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// {
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// ref float wRef = ref Unsafe.Add(ref weightsRef, i);
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// wRef /= sum;
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// }
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// }
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} |
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private (float radius, float scale) GetSamplingRadius(int sourceSize, int destinationSize) |
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{ |
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float scale = (float)sourceSize / destinationSize; |
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if (scale < 1F) |
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{ |
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scale = 1F; |
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} |
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return (MathF.Ceiling(scale * this.sampler.Radius), scale); |
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} |
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public void Dispose() |
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{ |
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this.yBuffer?.Dispose(); |
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this.xBuffer?.Dispose(); |
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} |
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} |
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} |
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@ -0,0 +1,121 @@ |
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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.Numerics; |
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using SixLabors.Primitives; |
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namespace SixLabors.ImageSharp.Processing.Processors.Transforms |
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{ |
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/// <summary>
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/// Contains utility methods for working with transforms.
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/// </summary>
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public static class TransformUtils |
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{ |
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/// <summary>
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/// Creates a centered rotation matrix using the given rotation in degrees and the source size.
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/// </summary>
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/// <param name="degrees">The amount of rotation, in degrees.</param>
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/// <param name="size">The source image size.</param>
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/// <returns>The <see cref="Matrix3x2"/>.</returns>
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public static Matrix3x2 CreateCenteredRotationMatrixDegrees(float degrees, Size size) |
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=> CreateCenteredTransformMatrix( |
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new Rectangle(Point.Empty, size), |
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Matrix3x2Extensions.CreateRotationDegrees(degrees, PointF.Empty)); |
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/// <summary>
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/// Gets the centered transform matrix based upon the source and destination rectangles.
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/// </summary>
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/// <param name="sourceRectangle">The source image bounds.</param>
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/// <param name="matrix">The transformation matrix.</param>
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/// <returns>The <see cref="Matrix3x2"/></returns>
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public static Matrix3x2 CreateCenteredTransformMatrix(Rectangle sourceRectangle, Matrix3x2 matrix) |
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{ |
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Rectangle destinationRectangle = GetTransformedBoundingRectangle(sourceRectangle, matrix); |
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// We invert the matrix to handle the transformation from screen to world space.
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// This ensures scaling matrices are correct.
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Matrix3x2.Invert(matrix, out Matrix3x2 inverted); |
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var translationToTargetCenter = Matrix3x2.CreateTranslation(new Vector2(-destinationRectangle.Width, -destinationRectangle.Height) * .5F); |
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var translateToSourceCenter = Matrix3x2.CreateTranslation(new Vector2(sourceRectangle.Width, sourceRectangle.Height) * .5F); |
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// Translate back to world space.
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Matrix3x2.Invert(translationToTargetCenter * inverted * translateToSourceCenter, out Matrix3x2 centered); |
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return centered; |
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} |
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/// <summary>
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/// Gets the centered transform matrix based upon the source and destination rectangles.
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/// </summary>
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/// <param name="sourceRectangle">The source image bounds.</param>
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/// <param name="destinationRectangle">The destination image bounds.</param>
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/// <param name="matrix">The transformation matrix.</param>
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/// <returns>The <see cref="Matrix3x2"/></returns>
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public static Matrix3x2 GetCenteredTransformMatrix(Rectangle sourceRectangle, Rectangle destinationRectangle, Matrix3x2 matrix) |
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{ |
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// We invert the matrix to handle the transformation from screen to world space.
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// This ensures scaling matrices are correct.
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Matrix3x2.Invert(matrix, out Matrix3x2 inverted); |
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var translationToTargetCenter = Matrix3x2.CreateTranslation(new Vector2(-destinationRectangle.Width, -destinationRectangle.Height) * .5F); |
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var translateToSourceCenter = Matrix3x2.CreateTranslation(new Vector2(sourceRectangle.Width, sourceRectangle.Height) * .5F); |
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// Translate back to world space.
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Matrix3x2.Invert(translationToTargetCenter * inverted * translateToSourceCenter, out Matrix3x2 centered); |
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|
|||
return centered; |
|||
} |
|||
|
|||
/// <summary>
|
|||
/// Returns the rectangle bounds relative to the source for the given transformation matrix.
|
|||
/// </summary>
|
|||
/// <param name="rectangle">The source rectangle.</param>
|
|||
/// <param name="matrix">The transformation matrix.</param>
|
|||
/// <returns>
|
|||
/// The <see cref="Rectangle"/>.
|
|||
/// </returns>
|
|||
public static Rectangle GetTransformedBoundingRectangle(Rectangle rectangle, Matrix3x2 matrix) |
|||
{ |
|||
Rectangle transformed = GetTransformedRectangle(rectangle, matrix); |
|||
|
|||
// TODO: Check this.
|
|||
return new Rectangle(0, 0, transformed.Width, transformed.Height); |
|||
} |
|||
|
|||
/// <summary>
|
|||
/// Returns the rectangle relative to the source for the given transformation matrix.
|
|||
/// </summary>
|
|||
/// <param name="rectangle">The source rectangle.</param>
|
|||
/// <param name="matrix">The transformation matrix.</param>
|
|||
/// <returns>
|
|||
/// The <see cref="Rectangle"/>.
|
|||
/// </returns>
|
|||
public static Rectangle GetTransformedRectangle(Rectangle rectangle, Matrix3x2 matrix) |
|||
{ |
|||
if (rectangle.Equals(default) || Matrix3x2.Identity.Equals(matrix)) |
|||
{ |
|||
return rectangle; |
|||
} |
|||
|
|||
var tl = Vector2.Transform(new Vector2(rectangle.Left, rectangle.Top), matrix); |
|||
var tr = Vector2.Transform(new Vector2(rectangle.Right, rectangle.Top), matrix); |
|||
var bl = Vector2.Transform(new Vector2(rectangle.Left, rectangle.Bottom), matrix); |
|||
var br = Vector2.Transform(new Vector2(rectangle.Right, rectangle.Bottom), matrix); |
|||
|
|||
return GetBoundingRectangle(tl, tr, bl, br); |
|||
} |
|||
|
|||
private static Rectangle GetBoundingRectangle(Vector2 tl, Vector2 tr, Vector2 bl, Vector2 br) |
|||
{ |
|||
// Find the minimum and maximum "corners" based on the given vectors
|
|||
float left = MathF.Min(tl.X, MathF.Min(tr.X, MathF.Min(bl.X, br.X))); |
|||
float top = MathF.Min(tl.Y, MathF.Min(tr.Y, MathF.Min(bl.Y, br.Y))); |
|||
float right = MathF.Max(tl.X, MathF.Max(tr.X, MathF.Max(bl.X, br.X))); |
|||
float bottom = MathF.Max(tl.Y, MathF.Max(tr.Y, MathF.Max(bl.Y, br.Y))); |
|||
|
|||
return Rectangle.Round(RectangleF.FromLTRB(left, top, right, bottom)); |
|||
} |
|||
} |
|||
} |
|||
Loading…
Reference in new issue