Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / 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
- RootNamespaceAttribute.cs
- CodeTypeMember.cs
- PreviewPrintController.cs
- CodeObjectCreateExpression.cs
- Route.cs
- DataGridViewRowPrePaintEventArgs.cs
- ObjectItemAttributeAssemblyLoader.cs
- ResourceFallbackManager.cs
- UnicastIPAddressInformationCollection.cs
- SpeechUI.cs
- AliasedExpr.cs
- ExtensionQuery.cs
- XsltFunctions.cs
- XmlNamespaceManager.cs
- FastEncoderWindow.cs
- CompiledRegexRunner.cs
- ListControl.cs
- X509CertificateClaimSet.cs
- StorageScalarPropertyMapping.cs
- RuntimeEnvironment.cs
- Multiply.cs
- WebPartMinimizeVerb.cs
- HttpHostedTransportConfiguration.cs
- ToolStripOverflow.cs
- TypeElement.cs
- ApplicationServiceManager.cs
- SynthesizerStateChangedEventArgs.cs
- RoutedEventArgs.cs
- DataTableNewRowEvent.cs
- CodeLabeledStatement.cs
- PassportPrincipal.cs
- SplitContainerDesigner.cs
- LoginCancelEventArgs.cs
- HtmlElementEventArgs.cs
- FactoryGenerator.cs
- ListBoxItemWrapperAutomationPeer.cs
- BindMarkupExtensionSerializer.cs
- LinqDataSourceHelper.cs
- SelectedDatesCollection.cs
- TypePropertyEditor.cs
- assemblycache.cs
- Win32.cs
- CommandPlan.cs
- MonitoringDescriptionAttribute.cs
- BehaviorEditorPart.cs
- FixedSOMTable.cs
- TextModifierScope.cs
- DataTableCollection.cs
- LayoutTableCell.cs
- HtmlElementErrorEventArgs.cs
- RandomNumberGenerator.cs
- DataGridViewSelectedCellCollection.cs
- FrameworkContentElementAutomationPeer.cs
- QuotedPrintableStream.cs
- XmlEntity.cs
- OciHandle.cs
- __Filters.cs
- XmlQueryTypeFactory.cs
- PaperSize.cs
- MachineKeySection.cs
- ToolStripGrip.cs
- MultiPageTextView.cs
- LinearKeyFrames.cs
- PairComparer.cs
- BufferedConnection.cs
- ReadOnlyNameValueCollection.cs
- TypeResolvingOptionsAttribute.cs
- Vector3dCollection.cs
- Operand.cs
- FixedPageProcessor.cs
- CLRBindingWorker.cs
- IApplicationTrustManager.cs
- ErrorActivity.cs
- LayoutManager.cs
- ExtensionQuery.cs
- CodeDirectoryCompiler.cs
- FontWeightConverter.cs
- FlowchartDesigner.xaml.cs
- NullEntityWrapper.cs
- DataRowChangeEvent.cs
- DecimalFormatter.cs
- FunctionParameter.cs
- ConfigDefinitionUpdates.cs
- CompilationLock.cs
- EventsTab.cs
- ParseChildrenAsPropertiesAttribute.cs
- HttpPostClientProtocol.cs
- InputLanguageProfileNotifySink.cs
- EntityDataSourceEntitySetNameItem.cs
- NativeMethods.cs
- NameValueFileSectionHandler.cs
- CommandHelpers.cs
- DesignOnlyAttribute.cs
- XmlFormatReaderGenerator.cs
- DbRetry.cs
- DataColumnPropertyDescriptor.cs
- DefaultWorkflowSchedulerService.cs
- TemplateControlParser.cs
- ContentPlaceHolderDesigner.cs
- XmlSchemaImporter.cs