Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Misc / GDI / DeviceContexts.cs / 3 / DeviceContexts.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- #if WGCM_TEST_SUITE // Enable tracking when built for the test suites. #define TRACK_HDC #define GDI_FONT_CACHE_TRACK #endif #if WINFORMS_NAMESPACE namespace System.Windows.Forms.Internal #elif DRAWING_NAMESPACE namespace System.Drawing.Internal #else namespace System.Experimental.Gdi #endif { using System; using System.Collections.Generic; using System.Internal; using System.Diagnostics; using System.Drawing; using System.Threading; using Microsoft.Win32; ////// Keeps a cache of some graphics primitives. /// Created to improve performance of TextRenderer.MeasureText methods that don't receive a WindowsGraphics. /// This class mantains a cache of MRU WindowsFont objects in the process. (See VSWhidbey#301492). /// #if WINFORMS_PUBLIC_GRAPHICS_LIBRARY public #else internal #endif static class DeviceContexts { [ThreadStatic] private static ClientUtils.WeakRefCollection activeDeviceContexts; ////// WindowsGraphicsCacheManager needs to track DeviceContext /// objects so it can ask them if a font is in use before they /// it's deleted. internal static void AddDeviceContext(DeviceContext dc) { if (activeDeviceContexts == null) { activeDeviceContexts = new ClientUtils.WeakRefCollection(); activeDeviceContexts.RefCheckThreshold = 20; // See DevDiv#82664 (the repro app attached to this bug was used to determine this number). } if (!activeDeviceContexts.Contains(dc)) { activeDeviceContexts.Add(dc); } } internal static void RemoveDeviceContext(DeviceContext dc) { if (activeDeviceContexts == null) { return; } activeDeviceContexts.RemoveByHashCode(dc); } #if !DRAWING_NAMESPACE internal static bool IsFontInUse(WindowsFont wf) { if (wf == null) { return false; } for (int i = 0; i < activeDeviceContexts.Count; i++) { DeviceContext dc = activeDeviceContexts[i] as DeviceContext; if (dc != null && (dc.ActiveFont == wf || dc.IsFontOnContextStack(wf))) { return true; } } return false; } #endif } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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