118 lines
4.2 KiB
C#
118 lines
4.2 KiB
C#
#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Diagnostics;
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using System.Collections.Generic;
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using System.Globalization;
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using PdfSharp.Drawing;
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namespace PdfSharp.Pdf.Advanced
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{
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/// <summary>
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/// Contains all used images of a document.
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/// </summary>
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internal sealed class PdfImageTable : PdfResourceTable
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{
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/// <summary>
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/// Initializes a new instance of this class, which is a singleton for each document.
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/// </summary>
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public PdfImageTable(PdfDocument document)
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: base(document)
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{ }
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/// <summary>
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/// Gets a PdfImage from an XImage. If no PdfImage already exists, a new one is created.
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/// </summary>
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public PdfImage GetImage(XImage image)
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{
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ImageSelector selector = image._selector;
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if (selector == null)
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{
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selector = new ImageSelector(image);
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image._selector = selector;
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}
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PdfImage pdfImage;
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if (!_images.TryGetValue(selector, out pdfImage))
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{
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pdfImage = new PdfImage(Owner, image);
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//pdfImage.Document = _document;
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Debug.Assert(pdfImage.Owner == Owner);
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_images[selector] = pdfImage;
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}
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return pdfImage;
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}
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/// <summary>
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/// Map from ImageSelector to PdfImage.
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/// </summary>
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readonly Dictionary<ImageSelector, PdfImage> _images = new Dictionary<ImageSelector, PdfImage>();
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/// <summary>
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/// A collection of information that uniquely identifies a particular PdfImage.
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/// </summary>
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public class ImageSelector
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{
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/// <summary>
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/// Initializes a new instance of ImageSelector from an XImage.
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/// </summary>
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public ImageSelector(XImage image)
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{
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// HACK: implement a way to identify images when they are reused
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// TODO 4STLA Implementation that calculates MD5 hashes for images generated for the images can be found here: http://forum.pdfsharp.net/viewtopic.php?p=6959#p6959
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if (image._path == null)
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image._path = "*" + Guid.NewGuid().ToString("B");
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// HACK: just use full path to identify
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_path = image._path.ToLowerInvariant();
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}
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public string Path
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{
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get { return _path; }
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set { _path = value; }
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}
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string _path;
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public override bool Equals(object obj)
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{
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ImageSelector selector = obj as ImageSelector;
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if (selector == null)
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return false;
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return _path == selector._path;
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}
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public override int GetHashCode()
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{
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return _path.GetHashCode();
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}
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}
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}
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}
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