Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / System / Windows / Media / Imaging / BitmapSourceSafeMILHandle.cs / 1 / BitmapSourceSafeMILHandle.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // A sub-class of SafeMILHandle that can estimate size for bitmap // source objects. //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Security; using MS.Internal; using MS.Win32; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media.Imaging { ////// Constructor which computes size of the handle and delegates /// to baseclass safe handle. /// internal class BitmapSourceSafeMILHandle : SafeMILHandle { ////// Critical - initializes critical static field (autogenerated ctor) /// TreatAsSafe - sets them to the correct values, it's ok /// [SecurityCritical, SecurityTreatAsSafe] static BitmapSourceSafeMILHandle() { } ////// Use this constructor if the handle isn't ready yet and later /// set the handle with SetHandle. /// ////// Critical: This derives from a class that has a link demand and inheritance demand /// TreatAsSafe: Ok to call constructor /// [SecurityCritical,SecurityTreatAsSafe] internal BitmapSourceSafeMILHandle() : base() { } ////// Use this constructor if the handle exists at construction time. /// SafeMILHandle owns the release of the parameter. /// ////// Critical: It is used to keep memory around /// [SecurityCritical] internal BitmapSourceSafeMILHandle(IntPtr handle) : base() { SetHandle(handle); } ////// Calculate the rough size for this handle /// ////// Critical - access unmanaged code /// TreatAsSafe - queries size of the bitmap, safe operation /// /// Attributes are required for UnsafeNativeMethods.* calls /// [SecurityCritical,SecurityTreatAsSafe] internal void CalculateSize() { UpdateEstimatedSize(ComputeEstimatedSize(handle)); } ////// Compute a rough estimate of the size in bytes for the image /// ////// Critical - access unmanaged code and takes an IntPtr /// [SecurityCritical] private static long ComputeEstimatedSize(IntPtr bitmapObject) { long estimatedSize = 0; if (bitmapObject != null && bitmapObject != IntPtr.Zero) { IntPtr wicBitmap; // // QueryInterface for the bitmap source to ensure we are // calling through the right vtable on the pinvoke. // int hr = UnsafeNativeMethods.MILUnknown.QueryInterface( bitmapObject, ref _uuidBitmap, out wicBitmap ); if (hr == HRESULT.S_OK) { Debug.Assert(wicBitmap != IntPtr.Zero); // The safe handle will release the ref added by the above QI SafeMILHandle bitmapSourceSafeHandle = new SafeMILHandle(wicBitmap, 0); uint pixelWidth = 0; uint pixelHeight = 0; hr = UnsafeNativeMethods.WICBitmapSource.GetSize( bitmapSourceSafeHandle, out pixelWidth, out pixelHeight); if (hr == HRESULT.S_OK) { Guid guidFormat; hr = UnsafeNativeMethods.WICBitmapSource.GetPixelFormat(bitmapSourceSafeHandle, out guidFormat); if (hr == HRESULT.S_OK) { // // Go to long space to avoid overflow and check for overlfow // PixelFormat pixelFormat = new PixelFormat(guidFormat); long scanlineSize = (long)pixelWidth * pixelFormat.InternalBitsPerPixel / 8; // // Check that scanlineSize is small enough that we can multiply by 2*pixelWidth // without an overflow. Since pixelHeight is a 32-bit value and we multiply by 2*pixelHeight, // then we can only have a 31-bit scanlineSize. Since we need a sign bit as well, // we need to check that scanlineSize can fit in 30 bits. // if (scanlineSize < 0x40000000) { // We often duplicate the image bits in a managed texture or elsewhere, so // estimate twice the natural size of the image. estimatedSize = 2*pixelHeight*scanlineSize; } } } } } return estimatedSize; } ////// Guid for IIDM_IMILBitmapSource /// ////// Critical - guid used for COM interop, need to be careful not to overwrite /// [SecurityCritical] private static Guid _uuidBitmap = MILGuidData.IID_IWICBitmap; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // A sub-class of SafeMILHandle that can estimate size for bitmap // source objects. //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Security; using MS.Internal; using MS.Win32; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media.Imaging { ////// Constructor which computes size of the handle and delegates /// to baseclass safe handle. /// internal class BitmapSourceSafeMILHandle : SafeMILHandle { ////// Critical - initializes critical static field (autogenerated ctor) /// TreatAsSafe - sets them to the correct values, it's ok /// [SecurityCritical, SecurityTreatAsSafe] static BitmapSourceSafeMILHandle() { } ////// Use this constructor if the handle isn't ready yet and later /// set the handle with SetHandle. /// ////// Critical: This derives from a class that has a link demand and inheritance demand /// TreatAsSafe: Ok to call constructor /// [SecurityCritical,SecurityTreatAsSafe] internal BitmapSourceSafeMILHandle() : base() { } ////// Use this constructor if the handle exists at construction time. /// SafeMILHandle owns the release of the parameter. /// ////// Critical: It is used to keep memory around /// [SecurityCritical] internal BitmapSourceSafeMILHandle(IntPtr handle) : base() { SetHandle(handle); } ////// Calculate the rough size for this handle /// ////// Critical - access unmanaged code /// TreatAsSafe - queries size of the bitmap, safe operation /// /// Attributes are required for UnsafeNativeMethods.* calls /// [SecurityCritical,SecurityTreatAsSafe] internal void CalculateSize() { UpdateEstimatedSize(ComputeEstimatedSize(handle)); } ////// Compute a rough estimate of the size in bytes for the image /// ////// Critical - access unmanaged code and takes an IntPtr /// [SecurityCritical] private static long ComputeEstimatedSize(IntPtr bitmapObject) { long estimatedSize = 0; if (bitmapObject != null && bitmapObject != IntPtr.Zero) { IntPtr wicBitmap; // // QueryInterface for the bitmap source to ensure we are // calling through the right vtable on the pinvoke. // int hr = UnsafeNativeMethods.MILUnknown.QueryInterface( bitmapObject, ref _uuidBitmap, out wicBitmap ); if (hr == HRESULT.S_OK) { Debug.Assert(wicBitmap != IntPtr.Zero); // The safe handle will release the ref added by the above QI SafeMILHandle bitmapSourceSafeHandle = new SafeMILHandle(wicBitmap, 0); uint pixelWidth = 0; uint pixelHeight = 0; hr = UnsafeNativeMethods.WICBitmapSource.GetSize( bitmapSourceSafeHandle, out pixelWidth, out pixelHeight); if (hr == HRESULT.S_OK) { Guid guidFormat; hr = UnsafeNativeMethods.WICBitmapSource.GetPixelFormat(bitmapSourceSafeHandle, out guidFormat); if (hr == HRESULT.S_OK) { // // Go to long space to avoid overflow and check for overlfow // PixelFormat pixelFormat = new PixelFormat(guidFormat); long scanlineSize = (long)pixelWidth * pixelFormat.InternalBitsPerPixel / 8; // // Check that scanlineSize is small enough that we can multiply by 2*pixelWidth // without an overflow. Since pixelHeight is a 32-bit value and we multiply by 2*pixelHeight, // then we can only have a 31-bit scanlineSize. Since we need a sign bit as well, // we need to check that scanlineSize can fit in 30 bits. // if (scanlineSize < 0x40000000) { // We often duplicate the image bits in a managed texture or elsewhere, so // estimate twice the natural size of the image. estimatedSize = 2*pixelHeight*scanlineSize; } } } } } return estimatedSize; } ////// Guid for IIDM_IMILBitmapSource /// ////// Critical - guid used for COM interop, need to be careful not to overwrite /// [SecurityCritical] private static Guid _uuidBitmap = MILGuidData.IID_IWICBitmap; } } // 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
- FunctionQuery.cs
- ListViewDataItem.cs
- PermissionSetEnumerator.cs
- DelegatingTypeDescriptionProvider.cs
- DBBindings.cs
- PipelineModuleStepContainer.cs
- MenuAdapter.cs
- SplashScreenNativeMethods.cs
- AppDomainUnloadedException.cs
- XmlCodeExporter.cs
- SQLInt32.cs
- LogRestartAreaEnumerator.cs
- ImageAnimator.cs
- FormatConvertedBitmap.cs
- Block.cs
- SendMessageRecord.cs
- UserUseLicenseDictionaryLoader.cs
- ScrollItemProviderWrapper.cs
- RequestSecurityTokenForGetBrowserToken.cs
- VisualBrush.cs
- LambdaCompiler.cs
- RestClientProxyHandler.cs
- EnumValAlphaComparer.cs
- X509Certificate2Collection.cs
- MouseCaptureWithinProperty.cs
- DeferredTextReference.cs
- CustomError.cs
- DesignerDataConnection.cs
- SHA256Cng.cs
- EditingScopeUndoUnit.cs
- tooltip.cs
- SspiNegotiationTokenAuthenticatorState.cs
- FolderBrowserDialog.cs
- DbReferenceCollection.cs
- ThousandthOfEmRealPoints.cs
- XmlExpressionDumper.cs
- DayRenderEvent.cs
- base64Transforms.cs
- entityreference_tresulttype.cs
- AnimationException.cs
- Substitution.cs
- TextBoxDesigner.cs
- GridViewRowPresenter.cs
- DifferencingCollection.cs
- ZeroOpNode.cs
- LocalizableResourceBuilder.cs
- ConstNode.cs
- WpfWebRequestHelper.cs
- Vector3DAnimation.cs
- AnnouncementService.cs
- CodeTypeMemberCollection.cs
- ProjectionPlanCompiler.cs
- WebPartTracker.cs
- HttpDateParse.cs
- _NegotiateClient.cs
- PackageProperties.cs
- X509CertificateCollection.cs
- Menu.cs
- LoadMessageLogger.cs
- HopperCache.cs
- SamlAssertion.cs
- SQLInt64Storage.cs
- IgnoreFileBuildProvider.cs
- FontCacheLogic.cs
- PropertyTab.cs
- TextRange.cs
- ErrorTolerantObjectWriter.cs
- FtpWebRequest.cs
- PersonalizationEntry.cs
- DrawListViewSubItemEventArgs.cs
- EventSetter.cs
- SoundPlayer.cs
- HtmlShimManager.cs
- SqlServer2KCompatibilityAnnotation.cs
- HwndSourceKeyboardInputSite.cs
- TimelineClockCollection.cs
- WSFederationHttpBinding.cs
- WorkflowDebuggerSteppingAttribute.cs
- HandoffBehavior.cs
- MessageQueueCriteria.cs
- HttpPostedFileWrapper.cs
- InvokePatternIdentifiers.cs
- ObjectComplexPropertyMapping.cs
- MenuItemCollection.cs
- RowType.cs
- OutputCacheModule.cs
- BroadcastEventHelper.cs
- SystemIcons.cs
- HealthMonitoringSectionHelper.cs
- ScrollContentPresenter.cs
- SectionUpdates.cs
- ProxySimple.cs
- TTSVoice.cs
- XXXInfos.cs
- ThousandthOfEmRealDoubles.cs
- GcHandle.cs
- newinstructionaction.cs
- ImageButton.cs
- PropertyMappingExceptionEventArgs.cs
- ScrollPattern.cs