Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Misc / GDI / MeasurementDCInfo.cs / 1305376 / MeasurementDCInfo.cs
#if OPTIMIZED_MEASUREMENTDC #if WGCM_TEST_SUITE // Enable tracking when built for the test suites. #define TRACK_HDC #define GDI_FONT_CACHE_TRACK #endif #if [....]_NAMESPACE namespace System.Windows.Forms.Internal { #elif DRAWING_NAMESPACE namespace System.Drawing.Internal { #else namespace System.Experimental.Gdi { #endif #if [....]_PUBLIC_GRAPHICS_LIBRARY public #else internal #endif static class MeasurementDCInfo { /// MeasurementDCInfo /// This class optimizes the MeasurmentGraphics as it caches in the last used font and TextMargins used. /// This prevents unnecessary p/invoke calls to GetCurrentObject, etc /// It has been found to give close to 2x performance when drawing lots of text in rapid succession /// DataGridView with lots of text, etc. /// To turn it on for your DLL, use the OPTIMIZED_MEASUREMENTDC compiler switch and add this class to the sources. [ThreadStatic] private static CachedInfo cachedMeasurementDCInfo; /// IsMeasurementDC /// Returns whether the IDeviceContext passed in is our static MeasurementDC. /// If it is, we know a bit more information about it. internal static bool IsMeasurementDC(DeviceContext dc) { WindowsGraphics sharedGraphics = WindowsGraphicsCacheManager.GetCurrentMeasurementGraphics(); return sharedGraphics != null && sharedGraphics.DeviceContext != null && sharedGraphics.DeviceContext.Hdc == dc.Hdc; } /// LastUsedFont - /// Returns the font we think was last selected into the MeasurementGraphics. /// internal static WindowsFont LastUsedFont { get { return (cachedMeasurementDCInfo == null) ? null : cachedMeasurementDCInfo.LastUsedFont; } set { if (cachedMeasurementDCInfo == null) { cachedMeasurementDCInfo = new CachedInfo(); } cachedMeasurementDCInfo.UpdateFont(value); } } /// GetTextMargins - checks to see if we have cached information about the current font, /// returns info about it. /// An MRU of Font margins was considered, but seems like overhead. internal static IntNativeMethods.DRAWTEXTPARAMS GetTextMargins(WindowsGraphics wg, WindowsFont font) { // PERF: operate on a local reference rather than party directly on the thread static one. CachedInfo currentCachedInfo = cachedMeasurementDCInfo; if (currentCachedInfo != null && currentCachedInfo.LeftTextMargin >0 && currentCachedInfo.RightTextMargin >0 && font == currentCachedInfo.LastUsedFont) { // we have to return clones as DrawTextEx will modify this struct return new IntNativeMethods.DRAWTEXTPARAMS(currentCachedInfo.LeftTextMargin,currentCachedInfo.RightTextMargin); } else if (currentCachedInfo == null) { currentCachedInfo = new CachedInfo(); cachedMeasurementDCInfo = currentCachedInfo; } IntNativeMethods.DRAWTEXTPARAMS drawTextParams = wg.GetTextMargins(font); currentCachedInfo.LeftTextMargin = drawTextParams.iLeftMargin; currentCachedInfo.RightTextMargin = drawTextParams.iRightMargin; // returning a copy here to be consistent with the return value from the cache. return new IntNativeMethods.DRAWTEXTPARAMS(currentCachedInfo.LeftTextMargin,currentCachedInfo.RightTextMargin); } internal static void ResetIfIsMeasurementDC(IntPtr hdc) { WindowsGraphics sharedGraphics = WindowsGraphicsCacheManager.GetCurrentMeasurementGraphics(); if (sharedGraphics != null && sharedGraphics.DeviceContext != null && sharedGraphics.DeviceContext.Hdc == hdc) { CachedInfo currentCachedInfo = cachedMeasurementDCInfo; if (currentCachedInfo != null) { currentCachedInfo.UpdateFont(null); } } } /// Reset /// clear the current cached information about the measurement dc. internal static void Reset() { CachedInfo currentCachedInfo = cachedMeasurementDCInfo; if (currentCachedInfo != null) { currentCachedInfo.UpdateFont(null); } } /// CachedInfo /// store all the thread statics together so we dont have to fetch individual fields out of TLS private sealed class CachedInfo { public WindowsFont LastUsedFont; public int LeftTextMargin; public int RightTextMargin; internal void UpdateFont(WindowsFont font) { if (LastUsedFont != font) { LastUsedFont = font; LeftTextMargin = -1; RightTextMargin = -1; } } } } } #endif // OPTIMIZED_MEASUREMENTDC // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. #if OPTIMIZED_MEASUREMENTDC #if WGCM_TEST_SUITE // Enable tracking when built for the test suites. #define TRACK_HDC #define GDI_FONT_CACHE_TRACK #endif #if [....]_NAMESPACE namespace System.Windows.Forms.Internal { #elif DRAWING_NAMESPACE namespace System.Drawing.Internal { #else namespace System.Experimental.Gdi { #endif #if [....]_PUBLIC_GRAPHICS_LIBRARY public #else internal #endif static class MeasurementDCInfo { /// MeasurementDCInfo /// This class optimizes the MeasurmentGraphics as it caches in the last used font and TextMargins used. /// This prevents unnecessary p/invoke calls to GetCurrentObject, etc /// It has been found to give close to 2x performance when drawing lots of text in rapid succession /// DataGridView with lots of text, etc. /// To turn it on for your DLL, use the OPTIMIZED_MEASUREMENTDC compiler switch and add this class to the sources. [ThreadStatic] private static CachedInfo cachedMeasurementDCInfo; /// IsMeasurementDC /// Returns whether the IDeviceContext passed in is our static MeasurementDC. /// If it is, we know a bit more information about it. internal static bool IsMeasurementDC(DeviceContext dc) { WindowsGraphics sharedGraphics = WindowsGraphicsCacheManager.GetCurrentMeasurementGraphics(); return sharedGraphics != null && sharedGraphics.DeviceContext != null && sharedGraphics.DeviceContext.Hdc == dc.Hdc; } /// LastUsedFont - /// Returns the font we think was last selected into the MeasurementGraphics. /// internal static WindowsFont LastUsedFont { get { return (cachedMeasurementDCInfo == null) ? null : cachedMeasurementDCInfo.LastUsedFont; } set { if (cachedMeasurementDCInfo == null) { cachedMeasurementDCInfo = new CachedInfo(); } cachedMeasurementDCInfo.UpdateFont(value); } } /// GetTextMargins - checks to see if we have cached information about the current font, /// returns info about it. /// An MRU of Font margins was considered, but seems like overhead. internal static IntNativeMethods.DRAWTEXTPARAMS GetTextMargins(WindowsGraphics wg, WindowsFont font) { // PERF: operate on a local reference rather than party directly on the thread static one. CachedInfo currentCachedInfo = cachedMeasurementDCInfo; if (currentCachedInfo != null && currentCachedInfo.LeftTextMargin >0 && currentCachedInfo.RightTextMargin >0 && font == currentCachedInfo.LastUsedFont) { // we have to return clones as DrawTextEx will modify this struct return new IntNativeMethods.DRAWTEXTPARAMS(currentCachedInfo.LeftTextMargin,currentCachedInfo.RightTextMargin); } else if (currentCachedInfo == null) { currentCachedInfo = new CachedInfo(); cachedMeasurementDCInfo = currentCachedInfo; } IntNativeMethods.DRAWTEXTPARAMS drawTextParams = wg.GetTextMargins(font); currentCachedInfo.LeftTextMargin = drawTextParams.iLeftMargin; currentCachedInfo.RightTextMargin = drawTextParams.iRightMargin; // returning a copy here to be consistent with the return value from the cache. return new IntNativeMethods.DRAWTEXTPARAMS(currentCachedInfo.LeftTextMargin,currentCachedInfo.RightTextMargin); } internal static void ResetIfIsMeasurementDC(IntPtr hdc) { WindowsGraphics sharedGraphics = WindowsGraphicsCacheManager.GetCurrentMeasurementGraphics(); if (sharedGraphics != null && sharedGraphics.DeviceContext != null && sharedGraphics.DeviceContext.Hdc == hdc) { CachedInfo currentCachedInfo = cachedMeasurementDCInfo; if (currentCachedInfo != null) { currentCachedInfo.UpdateFont(null); } } } /// Reset /// clear the current cached information about the measurement dc. internal static void Reset() { CachedInfo currentCachedInfo = cachedMeasurementDCInfo; if (currentCachedInfo != null) { currentCachedInfo.UpdateFont(null); } } /// CachedInfo /// store all the thread statics together so we dont have to fetch individual fields out of TLS private sealed class CachedInfo { public WindowsFont LastUsedFont; public int LeftTextMargin; public int RightTextMargin; internal void UpdateFont(WindowsFont font) { if (LastUsedFont != font) { LastUsedFont = font; LeftTextMargin = -1; RightTextMargin = -1; } } } } } #endif // OPTIMIZED_MEASUREMENTDC // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HijriCalendar.cs
- FileStream.cs
- SimpleWebHandlerParser.cs
- TdsParserHelperClasses.cs
- HwndTarget.cs
- LayoutUtils.cs
- XmlEncodedRawTextWriter.cs
- DiffuseMaterial.cs
- TransformGroup.cs
- PersonalizationStateInfo.cs
- TextAdaptor.cs
- RuleConditionDialog.Designer.cs
- HtmlProps.cs
- XPathNode.cs
- BitmapEffectDrawingContextState.cs
- ToolStripItemCollection.cs
- ResourceManager.cs
- Matrix.cs
- RevocationPoint.cs
- ObjectFactoryCodeDomTreeGenerator.cs
- InheritedPropertyChangedEventArgs.cs
- CompositionAdorner.cs
- Timer.cs
- TextElementAutomationPeer.cs
- GetCertificateRequest.cs
- SecurityPermission.cs
- SQLInt16Storage.cs
- UICuesEvent.cs
- WebRequestModulesSection.cs
- DisplayInformation.cs
- GenericsInstances.cs
- HttpHandler.cs
- XmlArrayItemAttribute.cs
- SynchronizingStream.cs
- DBBindings.cs
- CodeBinaryOperatorExpression.cs
- Registration.cs
- SafeEventLogWriteHandle.cs
- ColorConvertedBitmap.cs
- HtmlInputCheckBox.cs
- TargetControlTypeCache.cs
- HtmlHistory.cs
- RichTextBoxConstants.cs
- HelpKeywordAttribute.cs
- VersionValidator.cs
- CutCopyPasteHelper.cs
- PrintDocument.cs
- SectionUpdates.cs
- WebControlAdapter.cs
- RuleDefinitions.cs
- PeerCollaborationPermission.cs
- RuntimeHandles.cs
- ExtentJoinTreeNode.cs
- TimeStampChecker.cs
- SqlDependencyListener.cs
- CellQuery.cs
- XmlSerializableWriter.cs
- DataGridViewSelectedCellsAccessibleObject.cs
- StringAttributeCollection.cs
- SqlDataReader.cs
- IChannel.cs
- NativeMethods.cs
- ComponentEvent.cs
- TransformedBitmap.cs
- MobileResource.cs
- CustomWebEventKey.cs
- GenerateHelper.cs
- SoapFault.cs
- TypeNameConverter.cs
- DataTableReaderListener.cs
- AssemblyCacheEntry.cs
- StringResourceManager.cs
- RsaKeyIdentifierClause.cs
- TextServicesCompartment.cs
- CustomGrammar.cs
- Pkcs7Recipient.cs
- RegexParser.cs
- altserialization.cs
- UnionExpr.cs
- DataGridViewTopLeftHeaderCell.cs
- ImageIndexConverter.cs
- CodeLabeledStatement.cs
- Bits.cs
- baseaxisquery.cs
- Delegate.cs
- SafeRightsManagementHandle.cs
- DatasetMethodGenerator.cs
- ValidatedControlConverter.cs
- EncodedStreamFactory.cs
- SQLInt64.cs
- CompletionCallbackWrapper.cs
- WindowsFormsSectionHandler.cs
- ConfigurationManagerInternalFactory.cs
- TaiwanCalendar.cs
- UriScheme.cs
- ChangeInterceptorAttribute.cs
- ZoneIdentityPermission.cs
- FontClient.cs
- returneventsaver.cs
- Emitter.cs