mirror of https://github.com/SixLabors/ImageSharp
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Former-commit-id: 958a88f70621bf71649c242bfa83c16805a17eb5 Former-commit-id: 2009496612029e60a60b814cd1b752c275761f45pull/17/head
James South
12 years ago
6 changed files with 479 additions and 288 deletions
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// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="Resizer.cs" company="James South">
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// Copyright (c) James South.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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// <summary>
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// Provides methods to resize images.
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// </summary>
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// --------------------------------------------------------------------------------------------------------------------
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namespace ImageProcessor.Imaging |
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{ |
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using System; |
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using System.Collections.Generic; |
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using System.Drawing; |
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using System.Drawing.Drawing2D; |
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using System.Drawing.Imaging; |
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using System.Linq; |
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using ImageProcessor.Common.Exceptions; |
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/// <summary>
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/// Provides methods to resize images.
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/// </summary>
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public class Resizer |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="Resizer"/> class.
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/// </summary>
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/// <param name="size">
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/// The <see cref="Size"/> to resize the image to.
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/// </param>
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public Resizer(Size size) |
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{ |
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this.ResizeLayer = new ResizeLayer(size); |
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} |
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/// <summary>
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/// Initializes a new instance of the <see cref="Resizer"/> class.
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/// </summary>
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/// <param name="resizeLayer">
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/// The <see cref="ResizeLayer"/>.
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/// </param>
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public Resizer(ResizeLayer resizeLayer) |
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{ |
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this.ResizeLayer = resizeLayer; |
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} |
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/// <summary>
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/// Gets or sets the <see cref="ResizeLayer"/>.
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/// </summary>
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public ResizeLayer ResizeLayer { get; set; } |
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/// <summary>
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/// Resizes the given image.
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/// </summary>
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/// <param name="source">
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/// The source <see cref="Image"/> to resize
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/// </param>
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/// <returns>
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/// The resized <see cref="Image"/>.
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/// </returns>
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public Image ResizeImage(Image source) |
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{ |
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int width = this.ResizeLayer.Size.Width; |
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int height = this.ResizeLayer.Size.Height; |
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ResizeMode mode = this.ResizeLayer.ResizeMode; |
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AnchorPosition anchor = this.ResizeLayer.AnchorPosition; |
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bool upscale = this.ResizeLayer.Upscale; |
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float[] centerCoordinates = this.ResizeLayer.CenterCoordinates; |
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int maxWidth = this.ResizeLayer.MaxSize.HasValue ? this.ResizeLayer.MaxSize.Value.Width : int.MaxValue; |
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int maxHeight = this.ResizeLayer.MaxSize.HasValue ? this.ResizeLayer.MaxSize.Value.Height : int.MaxValue; |
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List<Size> restrictedSizes = this.ResizeLayer.RestrictedSizes; |
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return this.ResizeImage(source, width, height, maxWidth, maxHeight, restrictedSizes, mode, anchor, upscale, centerCoordinates); |
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} |
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/// <summary>
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/// Resizes the given image.
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/// </summary>
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/// <param name="source">
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/// The source <see cref="Image"/> to resize
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/// </param>
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/// <param name="width">
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/// The width to resize the image to.
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/// </param>
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/// <param name="height">
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/// The height to resize the image to.
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/// </param>
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/// <param name="maxWidth">
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/// The default max width to resize the image to.
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/// </param>
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/// <param name="maxHeight">
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/// The default max height to resize the image to.
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/// </param>
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/// <param name="restrictedSizes">
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/// A <see cref="List{T}"/> containing image resizing restrictions.
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/// </param>
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/// <param name="resizeMode">
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/// The mode with which to resize the image.
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/// </param>
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/// <param name="anchorPosition">
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/// The anchor position to place the image at.
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/// </param>
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/// <param name="upscale">
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/// Whether to allow up-scaling of images. (Default true)
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/// </param>
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/// <param name="centerCoordinates">
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/// If the resize mode is crop, you can set a specific center coordinate, use as alternative to anchorPosition
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/// </param>
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/// <returns>
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/// The resized <see cref="Image"/>.
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/// </returns>
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private Image ResizeImage( |
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Image source, |
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int width, |
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int height, |
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int maxWidth, |
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int maxHeight, |
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List<Size> restrictedSizes, |
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ResizeMode resizeMode = ResizeMode.Pad, |
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AnchorPosition anchorPosition = AnchorPosition.Center, |
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bool upscale = true, |
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float[] centerCoordinates = null) |
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{ |
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Bitmap newImage = null; |
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try |
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{ |
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int sourceWidth = source.Width; |
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int sourceHeight = source.Height; |
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int destinationWidth = width; |
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int destinationHeight = height; |
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maxWidth = maxWidth > 0 ? maxWidth : int.MaxValue; |
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maxHeight = maxHeight > 0 ? maxHeight : int.MaxValue; |
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// Fractional variants for preserving aspect ratio.
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double percentHeight = Math.Abs(height / (double)sourceHeight); |
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double percentWidth = Math.Abs(width / (double)sourceWidth); |
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int destinationX = 0; |
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int destinationY = 0; |
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// Change the destination rectangle coordinates if padding and
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// there has been a set width and height.
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if (resizeMode == ResizeMode.Pad && width > 0 && height > 0) |
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{ |
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double ratio; |
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if (percentHeight < percentWidth) |
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{ |
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ratio = percentHeight; |
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destinationX = Convert.ToInt32((width - (sourceWidth * ratio)) / 2); |
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destinationWidth = Convert.ToInt32(sourceWidth * percentHeight); |
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} |
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else |
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{ |
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ratio = percentWidth; |
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destinationY = Convert.ToInt32((height - (sourceHeight * ratio)) / 2); |
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destinationHeight = Convert.ToInt32(sourceHeight * percentWidth); |
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} |
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} |
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// Change the destination rectangle coordinates if cropping and
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// there has been a set width and height.
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if (resizeMode == ResizeMode.Crop && width > 0 && height > 0) |
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{ |
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double ratio; |
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if (percentHeight < percentWidth) |
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{ |
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ratio = percentWidth; |
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if (centerCoordinates != null && centerCoordinates.Any()) |
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{ |
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double center = -(ratio * sourceHeight) * centerCoordinates[0]; |
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destinationY = (int)center + (height / 2); |
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if (destinationY > 0) |
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{ |
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destinationY = 0; |
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} |
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if (destinationY < (int)(height - (sourceHeight * ratio))) |
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{ |
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destinationY = (int)(height - (sourceHeight * ratio)); |
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} |
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} |
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else |
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{ |
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switch (anchorPosition) |
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{ |
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case AnchorPosition.Top: |
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destinationY = 0; |
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break; |
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case AnchorPosition.Bottom: |
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destinationY = (int)(height - (sourceHeight * ratio)); |
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break; |
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default: |
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destinationY = (int)((height - (sourceHeight * ratio)) / 2); |
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break; |
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} |
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} |
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destinationHeight = (int)Math.Ceiling(sourceHeight * percentWidth); |
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} |
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else |
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{ |
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ratio = percentHeight; |
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if (centerCoordinates != null && centerCoordinates.Any()) |
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{ |
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double center = -(ratio * sourceWidth) * centerCoordinates[1]; |
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destinationX = (int)center + (width / 2); |
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if (destinationX > 0) |
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{ |
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destinationX = 0; |
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} |
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if (destinationX < (int)(width - (sourceWidth * ratio))) |
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{ |
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destinationX = (int)(width - (sourceWidth * ratio)); |
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} |
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} |
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else |
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{ |
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switch (anchorPosition) |
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{ |
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case AnchorPosition.Left: |
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destinationX = 0; |
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break; |
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case AnchorPosition.Right: |
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destinationX = (int)(width - (sourceWidth * ratio)); |
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break; |
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default: |
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destinationX = (int)((width - (sourceWidth * ratio)) / 2); |
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break; |
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} |
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} |
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destinationWidth = (int)Math.Ceiling(sourceWidth * percentHeight); |
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} |
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} |
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// Constrain the image to fit the maximum possible height or width.
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if (resizeMode == ResizeMode.Max) |
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{ |
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// If either is 0, we don't need to figure out orientation
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if (width > 0 && height > 0) |
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{ |
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// Integers must be cast to doubles to get needed precision
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double ratio = (double)height / width; |
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double sourceRatio = (double)sourceHeight / sourceWidth; |
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if (sourceRatio < ratio) |
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{ |
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height = 0; |
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} |
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else |
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{ |
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width = 0; |
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} |
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} |
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} |
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// If height or width is not passed we assume that the standard ratio is to be kept.
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if (height == 0) |
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{ |
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destinationHeight = Convert.ToInt32(sourceHeight * percentWidth); |
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height = destinationHeight; |
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} |
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if (width == 0) |
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{ |
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destinationHeight = Convert.ToInt32(sourceHeight * percentWidth); |
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width = destinationWidth; |
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} |
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// Restrict sizes
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if (restrictedSizes != null && restrictedSizes.Any()) |
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{ |
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bool reject = true; |
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foreach (Size restrictedSize in restrictedSizes) |
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{ |
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if (restrictedSize.Height == 0 || restrictedSize.Width == 0) |
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{ |
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if (restrictedSize.Width == width || restrictedSize.Height == height) |
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{ |
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reject = false; |
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} |
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} |
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else if (restrictedSize.Width == width && restrictedSize.Height == height) |
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{ |
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reject = false; |
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} |
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} |
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if (reject) |
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{ |
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return source; |
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} |
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} |
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if (width > 0 && height > 0 && width <= maxWidth && height <= maxHeight) |
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{ |
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// Exit if upscaling is not allowed.
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if ((width > sourceWidth || height > sourceHeight) && upscale == false && resizeMode != ResizeMode.Stretch) |
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{ |
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return source; |
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} |
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newImage = new Bitmap(width, height, PixelFormat.Format32bppPArgb); |
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using (Graphics graphics = Graphics.FromImage(newImage)) |
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{ |
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// We want to use two different blending algorithms for enlargement/shrinking.
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if (source.Width < destinationWidth && source.Height < destinationHeight) |
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{ |
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// We are making it larger.
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graphics.SmoothingMode = SmoothingMode.AntiAlias; |
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} |
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else |
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{ |
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// We are making it smaller.
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graphics.SmoothingMode = SmoothingMode.None; |
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} |
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graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; |
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graphics.PixelOffsetMode = PixelOffsetMode.HighQuality; |
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graphics.CompositingQuality = CompositingQuality.HighQuality; |
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// An unwanted border appears when using InterpolationMode.HighQualityBicubic to resize the image
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// as the algorithm appears to be pulling averaging detail from surrounding pixels beyond the edge
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// of the image. Using the ImageAttributes class to specify that the pixels beyond are simply mirror
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// images of the pixels within solves this problem.
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using (ImageAttributes wrapMode = new ImageAttributes()) |
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{ |
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wrapMode.SetWrapMode(WrapMode.TileFlipXY); |
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Rectangle destRect = new Rectangle(destinationX, destinationY, destinationWidth, destinationHeight); |
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graphics.DrawImage(source, destRect, 0, 0, sourceWidth, sourceHeight, GraphicsUnit.Pixel, wrapMode); |
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} |
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// Reassign the image.
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source.Dispose(); |
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source = newImage; |
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} |
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} |
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} |
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catch (Exception ex) |
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{ |
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if (newImage != null) |
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{ |
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newImage.Dispose(); |
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} |
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throw new ImageProcessingException("Error processing image with " + this.GetType().Name, ex); |
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} |
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return source; |
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} |
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} |
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} |
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@ -0,0 +1,63 @@ |
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// --------------------------------------------------------------------------------------------------------------------
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// <copyright file="Overlay.cs" company="James South">
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// Copyright (c) James South.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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// <summary>
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// Adds an image overlay to the current image.
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// </summary>
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// --------------------------------------------------------------------------------------------------------------------
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namespace ImageProcessor.Processors |
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{ |
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using System; |
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using System.Collections.Generic; |
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using System.Drawing; |
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/// <summary>
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/// Adds an image overlay to the current image.
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/// </summary>
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public class Overlay : IGraphicsProcessor |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="Overlay"/> class.
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/// </summary>
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public Overlay() |
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{ |
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this.Settings = new Dictionary<string, string>(); |
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} |
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/// <summary>
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/// Gets or sets the dynamic parameter.
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/// </summary>
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public dynamic DynamicParameter |
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{ |
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get; |
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set; |
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} |
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/// <summary>
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/// Gets or sets any additional settings required by the processor.
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/// </summary>
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public Dictionary<string, string> Settings |
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{ |
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get; |
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set; |
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} |
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/// <summary>
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/// Processes the image.
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/// </summary>
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/// <param name="factory">
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/// The current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class containing
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/// the image to process.
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/// </param>
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/// <returns>
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/// The processed image from the current instance of the <see cref="T:ImageProcessor.ImageFactory"/> class.
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/// </returns>
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public Image ProcessImage(ImageFactory factory) |
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{ |
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throw new NotImplementedException(); |
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} |
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} |
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} |
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