Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / FontCache / DWriteFactory.cs / 1407647 / DWriteFactory.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: The DWriteFactory class represents a shared DWrite factory // object. // // History: // 08/08/2008 : [....] - Integrating with DWrite. // //--------------------------------------------------------------------------- using System; using System.Security; using System.Security.Permissions; using System.IO; using System.Collections.Generic; using System.Text; using System.Diagnostics; using MS.Internal.PresentationCore; namespace MS.Internal.FontCache { internal static class DWriteFactory { ////// Critical - Access security critical Factory.Create method. /// Safe - The parameters passed to Factory.Create are internal /// types created by this method. /// [SecuritySafeCritical] static DWriteFactory() { _factory = Text.TextInterface.Factory.Create( Text.TextInterface.FactoryType.Shared, new FontSourceCollectionFactory(), new FontSourceFactory()); Text.TextInterface.LocalizedErrorMsgs.EnumeratorNotStarted = SR.Get(SRID.Enumerator_NotStarted); Text.TextInterface.LocalizedErrorMsgs.EnumeratorReachedEnd = SR.Get(SRID.Enumerator_ReachedEnd); } internal static Text.TextInterface.Factory Instance { ////// Critical - Exposes security critical _factory member. /// [SecurityCritical] get { return _factory; } } internal static Text.TextInterface.FontCollection SystemFontCollection { ////// Critical - provides access to the system fonts collection which exposes the windows fonts. /// [SecurityCritical] get { if (_systemFontCollection == null) { lock(_systemFontCollectionLock) { if (_systemFontCollection == null) { _systemFontCollection = DWriteFactory.Instance.GetSystemFontCollection(); } } } return _systemFontCollection; } } ////// Critical - Access security critical WindowsFontsUriObject object. /// - The caller of this method should own the verification of /// the access permissions to the given Uri. /// [SecurityCritical] private static Text.TextInterface.FontCollection GetFontCollectionFromFileOrFolder(Uri fontCollectionUri, bool isFolder) { if (Text.TextInterface.Factory.IsLocalUri(fontCollectionUri)) { string localPath; if (!isFolder) { // get the parent directory of the file. localPath = Directory.GetParent(fontCollectionUri.LocalPath).FullName + Path.DirectorySeparatorChar; } else { localPath = fontCollectionUri.LocalPath; } // If the directory specifed is the windows fonts directory then no need to reenumerate system fonts. if (String.Compare(((localPath.Length > 0 && localPath[localPath.Length - 1] != Path.DirectorySeparatorChar) ? localPath + Path.DirectorySeparatorChar : localPath), Util.WindowsFontsUriObject.LocalPath, StringComparison.OrdinalIgnoreCase) == 0) { return SystemFontCollection; } // Perf Descision: // Create a new FontCollection that has all the fonts in the directory. // The user will most likely use other fonts in a custom fonts directory. // A typical scenario is that a user will store all the fonts his/her App needs // in one directory. If we were not to follow this approach then we would create // a FontCollection for every font the user demands which may hurt performance. else { return DWriteFactory.Instance.GetFontCollection(new Uri(localPath)); } } // This isn't a local path so we create a FontCollection that only holds the desired font. // We follow a different approach here, as opposed to local files, where we only load the file // requested since file download and network latency cost becomes higher and loading all fonts // in a network path might hurt perf instead. return DWriteFactory.Instance.GetFontCollection(fontCollectionUri); } ////// Critical - calls security critical GetFontCollectionFromFileOrFolder. /// - The caller of this method should own the verification of /// the access permissions to the given Uri. /// [SecurityCritical] internal static Text.TextInterface.FontCollection GetFontCollectionFromFolder(Uri fontCollectionUri) { return GetFontCollectionFromFileOrFolder(fontCollectionUri, true); } ////// Critical - calls security critical GetFontCollectionFromFileOrFolder. /// - The caller of this method should own the verification of /// the access permissions to the given Uri. /// [SecurityCritical] internal static Text.TextInterface.FontCollection GetFontCollectionFromFile(Uri fontCollectionUri) { return GetFontCollectionFromFileOrFolder(fontCollectionUri, false); } ////// Critical - This is the DWrite factory that can be used to get everything about fonts. /// [SecurityCritical] private static Text.TextInterface.Factory _factory; private static Text.TextInterface.FontCollection _systemFontCollection = null; private static object _systemFontCollectionLock = new object(); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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