Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Imaging / ImagingCache.cs / 1 / ImagingCache.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation // // File: ImagingCache.cs // //----------------------------------------------------------------------------- using System; using System.IO; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using MS.Internal; using System.Diagnostics; using System.Windows.Media; using System.Globalization; using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; using System.Windows.Media.Animation; using System.Windows.Media.Composition; using System.Windows.Media.Imaging; using MS.Win32; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Media.Imaging { #region ImagingCache /// /// ImagingCache provides caching for different Imaging objects /// Caches are thread-safe. /// internal static class ImagingCache { #region Methods /// Adds an object to the image cache internal static void AddToImageCache(Uri uri, object obj) { AddToCache(uri, obj, _imageCache); } /// Removes an object from the image cache internal static void RemoveFromImageCache(Uri uri) { RemoveFromCache(uri, _imageCache); } /// Get object from the image cache internal static object CheckImageCache(Uri uri) { return CheckCache(uri, _imageCache); } /// Adds an object to the decoder cache internal static void AddToDecoderCache(Uri uri, object obj) { AddToCache(uri, obj, _decoderCache); } /// Removes an object from the decoder cache internal static void RemoveFromDecoderCache(Uri uri) { RemoveFromCache(uri, _decoderCache); } /// Get object from the image cache internal static object CheckDecoderCache(Uri uri) { return CheckCache(uri, _decoderCache); } /// Adds an object to a given table private static void AddToCache(Uri uri, object obj, Hashtable table) { lock(table) { // if entry is already there, exit if (table.Contains(uri)) { return; } // if the table has reached the max size, try to see if we can reduce its size if (table.Count == MAX_CACHE_SIZE) { ArrayList al = new ArrayList(); foreach (DictionaryEntry de in table) { // if the value is a WeakReference that has been GC'd, remove it WeakReference weakRef = de.Value as WeakReference; if ((weakRef != null) && (weakRef.Target == null)) { al.Add(de.Key); } } foreach (object o in al) { table.Remove(o); } } // if table is still maxed out, exit if (table.Count == MAX_CACHE_SIZE) { return; } // add it table[uri] = obj; } } /// Removes an object from a given table private static void RemoveFromCache(Uri uri, Hashtable table) { lock(table) { // if entry is there, remove it if (table.Contains(uri)) { table.Remove(uri); } } } /// Return an object from a given table private static object CheckCache(Uri uri, Hashtable table) { lock(table) { return table[uri]; } } #endregion #region Data Members /// image cache private static Hashtable _imageCache = new Hashtable(); /// decoder cache private static Hashtable _decoderCache = new Hashtable(); /// max size to limit the cache private static int MAX_CACHE_SIZE = 300; #endregion } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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