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Former-commit-id: 16779a3ac82e4d9ca67d4b9dd318b443c12e0949 Former-commit-id: fd491dea8ad3366ca25c6f7cf0760addadb6f2d4 Former-commit-id: 1c04febd3c3b9e84f4ea724707caacca73237b40af/merge-core
James Jackson-South
10 years ago
19 changed files with 197 additions and 239 deletions
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// <copyright file="Crop.cs" company="James Jackson-South">
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// <copyright file="CropProcessor.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 ImageProcessorCore.Processors |
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namespace ImageProcessorCore |
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{ |
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using System.Threading.Tasks; |
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/// <summary>
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/// Provides methods to allow the cropping of an image.
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/// </summary>
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public class Crop : ImageSampler |
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public class CropProcessor : ImageSampler |
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{ |
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/// <inheritdoc/>
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protected override void Apply(ImageBase target, ImageBase source, Rectangle targetRectangle, Rectangle sourceRectangle, int startY, int endY) |
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@ -1,186 +0,0 @@ |
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// <copyright file="Resampler.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 ImageProcessorCore.Processors |
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{ |
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using System; |
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/// <summary>
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/// Provides methods that allow the resampling of images using various algorithms.
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/// <see href="http://www.realtimerendering.com/resources/GraphicsGems/category.html#Image Processing_link"/>
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/// <see href="http://www.realtimerendering.com/resources/GraphicsGems/gemsiii/filter_rcg.c"/>
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/// </summary>
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public abstract class Resampler : ImageSampler |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="Resampler"/> class.
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/// </summary>
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/// <param name="sampler">
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/// The sampler to perform the resize operation.
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/// </param>
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protected Resampler(IResampler sampler) |
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{ |
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Guard.NotNull(sampler, nameof(sampler)); |
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this.Sampler = sampler; |
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} |
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/// <summary>
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/// Gets the sampler to perform the resize operation.
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/// </summary>
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public IResampler Sampler { get; } |
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/// <summary>
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/// Gets or sets the horizontal weights.
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/// </summary>
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protected Weights[] HorizontalWeights { get; set; } |
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/// <summary>
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/// Gets or sets the vertical weights.
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/// </summary>
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protected Weights[] VerticalWeights { get; set; } |
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/// <summary>
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/// Computes the weights to apply at each pixel when resizing.
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/// </summary>
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/// <param name="destinationSize">The destination section size.</param>
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/// <param name="sourceSize">The source section size.</param>
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/// <returns>
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/// The <see cref="T:Weights[]"/>.
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/// </returns>
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protected Weights[] PrecomputeWeights(int destinationSize, int sourceSize) |
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{ |
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float scale = (float)destinationSize / sourceSize; |
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IResampler sampler = this.Sampler; |
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float radius = sampler.Radius; |
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double left; |
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double right; |
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float weight; |
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int index; |
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int sum; |
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Weights[] result = new Weights[destinationSize]; |
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// When shrinking, broaden the effective kernel support so that we still
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// visit every source pixel.
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if (scale < 1) |
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{ |
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float width = radius / scale; |
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float filterScale = 1 / scale; |
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// Make the weights slices, one source for each column or row.
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for (int i = 0; i < destinationSize; i++) |
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{ |
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float centre = i / scale; |
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left = Math.Ceiling(centre - width); |
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right = Math.Floor(centre + width); |
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result[i] = new Weights |
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{ |
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Values = new Weight[(int)(right - left + 1)] |
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}; |
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for (double j = left; j <= right; j++) |
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{ |
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weight = sampler.GetValue((float)((centre - j) / filterScale)) / filterScale; |
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if (j < 0) |
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{ |
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index = (int)-j; |
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} |
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else if (j >= sourceSize) |
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{ |
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index = (int)((sourceSize - j) + sourceSize - 1); |
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} |
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else |
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{ |
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index = (int)j; |
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} |
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sum = (int)result[i].Sum++; |
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result[i].Values[sum] = new Weight(index, weight); |
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} |
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} |
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} |
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else |
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{ |
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// Make the weights slices, one source for each column or row.
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for (int i = 0; i < destinationSize; i++) |
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{ |
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float centre = i / scale; |
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left = Math.Ceiling(centre - radius); |
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right = Math.Floor(centre + radius); |
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result[i] = new Weights |
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{ |
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Values = new Weight[(int)(right - left + 1)] |
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}; |
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for (double j = left; j <= right; j++) |
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{ |
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weight = sampler.GetValue((float)(centre - j)); |
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if (j < 0) |
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{ |
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index = (int)-j; |
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} |
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else if (j >= sourceSize) |
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{ |
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index = (int)((sourceSize - j) + sourceSize - 1); |
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} |
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else |
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{ |
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index = (int)j; |
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} |
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sum = (int)result[i].Sum++; |
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result[i].Values[sum] = new Weight(index, weight); |
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} |
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} |
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} |
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return result; |
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} |
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/// <summary>
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/// Represents the weight to be added to a scaled pixel.
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/// </summary>
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protected struct Weight |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="Weight"/> struct.
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/// </summary>
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/// <param name="index">The index.</param>
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/// <param name="value">The value.</param>
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public Weight(int index, float value) |
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{ |
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this.Index = index; |
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this.Value = value; |
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} |
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/// <summary>
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/// Gets the pixel index.
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/// </summary>
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public int Index { get; } |
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/// <summary>
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/// Gets the result of the interpolation algorithm.
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/// </summary>
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public float Value { get; } |
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} |
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/// <summary>
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/// Represents a collection of weights and their sum.
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/// </summary>
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protected class Weights |
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{ |
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/// <summary>
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/// Gets or sets the values.
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/// </summary>
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public Weight[] Values { get; set; } |
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/// <summary>
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/// Gets or sets the sum.
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/// </summary>
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public float Sum { get; set; } |
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} |
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} |
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} |
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