Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Imaging / BitmapSourceSafeMILHandle.cs / 1305600 / 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); } ////// Use this constructor if the handle exists at construction time and memory pressure /// should be shared with another SafeMILHandle. /// SafeMILHandle owns the release of the parameter. /// ////// Critical: It is used to keep memory around /// [SecurityCritical] internal BitmapSourceSafeMILHandle(IntPtr handle, SafeMILHandle copyMemoryPressureFrom) : this(handle) { CopyMemoryPressure(copyMemoryPressureFrom); } ////// 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 // // There's no need to copy memory pressure. Partly because this SafeMILHandle // is temporary and will be collected after this method returns, partly // because there might no memory pressure calculated yet. // SafeMILHandle bitmapSourceSafeHandle = new SafeMILHandle(wicBitmap); 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 overflow // PixelFormat pixelFormat = new PixelFormat(guidFormat); long scanlineSize = (long)pixelWidth * pixelFormat.InternalBitsPerPixel / 8; // // Check that scanlineSize is small enough that we can multiply by pixelHeight // without an overflow. Since pixelHeight is a 32-bit value and we multiply by pixelHeight, // then we can only have a 32-bit scanlineSize. Since we need a sign bit as well, // we need to check that scanlineSize can fit in 30 bits. // if (scanlineSize < 0x40000000) { estimatedSize = pixelHeight * scanlineSize; } } } } } return estimatedSize; } ////// This is overridden to prevent JIT'ing due to new behavior in the CLR. (#708970) /// ////// Critical - Calls into other SecurityCritical code. not treat as safe because /// the caller must validate that the underlying handle is a valid COM object. /// [SecurityCritical] protected override bool ReleaseHandle() { return base.ReleaseHandle(); } ////// Guid for IWICBitmapSource /// ////// Critical - guid used for COM interop, need to be careful not to overwrite /// [SecurityCritical] private static Guid _uuidBitmap = MILGuidData.IID_IWICBitmapSource; } } // 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); } ////// Use this constructor if the handle exists at construction time and memory pressure /// should be shared with another SafeMILHandle. /// SafeMILHandle owns the release of the parameter. /// ////// Critical: It is used to keep memory around /// [SecurityCritical] internal BitmapSourceSafeMILHandle(IntPtr handle, SafeMILHandle copyMemoryPressureFrom) : this(handle) { CopyMemoryPressure(copyMemoryPressureFrom); } ////// 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 // // There's no need to copy memory pressure. Partly because this SafeMILHandle // is temporary and will be collected after this method returns, partly // because there might no memory pressure calculated yet. // SafeMILHandle bitmapSourceSafeHandle = new SafeMILHandle(wicBitmap); 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 overflow // PixelFormat pixelFormat = new PixelFormat(guidFormat); long scanlineSize = (long)pixelWidth * pixelFormat.InternalBitsPerPixel / 8; // // Check that scanlineSize is small enough that we can multiply by pixelHeight // without an overflow. Since pixelHeight is a 32-bit value and we multiply by pixelHeight, // then we can only have a 32-bit scanlineSize. Since we need a sign bit as well, // we need to check that scanlineSize can fit in 30 bits. // if (scanlineSize < 0x40000000) { estimatedSize = pixelHeight * scanlineSize; } } } } } return estimatedSize; } ////// This is overridden to prevent JIT'ing due to new behavior in the CLR. (#708970) /// ////// Critical - Calls into other SecurityCritical code. not treat as safe because /// the caller must validate that the underlying handle is a valid COM object. /// [SecurityCritical] protected override bool ReleaseHandle() { return base.ReleaseHandle(); } ////// Guid for IWICBitmapSource /// ////// Critical - guid used for COM interop, need to be careful not to overwrite /// [SecurityCritical] private static Guid _uuidBitmap = MILGuidData.IID_IWICBitmapSource; } } // 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
- BuildProvider.cs
- Attributes.cs
- GorillaCodec.cs
- Help.cs
- WeakKeyDictionary.cs
- SetIterators.cs
- ImageBrush.cs
- Point3DAnimationUsingKeyFrames.cs
- HttpProcessUtility.cs
- ActiveXHelper.cs
- ElementHost.cs
- EventQueueState.cs
- MethodExpr.cs
- XhtmlBasicTextViewAdapter.cs
- CodeCatchClauseCollection.cs
- StylusEditingBehavior.cs
- WorkflowNamespace.cs
- PrintDocument.cs
- TextTreePropertyUndoUnit.cs
- Span.cs
- MetaType.cs
- XmlQualifiedName.cs
- DependencyPropertyKey.cs
- XPathPatternBuilder.cs
- Pens.cs
- XmlFormatExtensionAttribute.cs
- CompositeTypefaceMetrics.cs
- TypeContext.cs
- FlowDocumentFormatter.cs
- DocumentViewerHelper.cs
- PathData.cs
- OracleRowUpdatingEventArgs.cs
- NetNamedPipeBinding.cs
- ValueSerializerAttribute.cs
- HitTestParameters.cs
- XmlReader.cs
- XMLSyntaxException.cs
- ProxyWebPart.cs
- OutputCacheModule.cs
- ValuePatternIdentifiers.cs
- HtmlAnchor.cs
- ObjectListShowCommandsEventArgs.cs
- InfocardInteractiveChannelInitializer.cs
- ErrorItem.cs
- StickyNoteContentControl.cs
- SetterBase.cs
- TemplatePropertyEntry.cs
- DropShadowEffect.cs
- GeneralTransformCollection.cs
- PtsContext.cs
- BridgeDataRecord.cs
- ContextMenu.cs
- XsdDataContractExporter.cs
- BaseCodeDomTreeGenerator.cs
- Encoder.cs
- GenericAuthenticationEventArgs.cs
- DeferredSelectedIndexReference.cs
- TimeBoundedCache.cs
- ActivationProxy.cs
- AdapterDictionary.cs
- ApplicationException.cs
- ObjectContextServiceProvider.cs
- X500Name.cs
- SqlFunctions.cs
- SortableBindingList.cs
- PropertyToken.cs
- QualifiedId.cs
- ServiceHostFactory.cs
- ValidationSummary.cs
- CodeAttributeArgument.cs
- Lease.cs
- AssignDesigner.xaml.cs
- SByte.cs
- Ports.cs
- UndoEngine.cs
- PermissionAttributes.cs
- SectionRecord.cs
- DocobjHost.cs
- WhitespaceRule.cs
- WebPartConnection.cs
- SplineKeyFrames.cs
- PageStatePersister.cs
- HwndSourceParameters.cs
- RectangleGeometry.cs
- NullableIntSumAggregationOperator.cs
- ControlEvent.cs
- OptimalBreakSession.cs
- UnaryNode.cs
- TypeInfo.cs
- LoadedOrUnloadedOperation.cs
- IndentedWriter.cs
- FakeModelPropertyImpl.cs
- cookieexception.cs
- PerformanceCounterCategory.cs
- DataObjectFieldAttribute.cs
- XomlCompiler.cs
- EmptyStringExpandableObjectConverter.cs
- PlatformCulture.cs
- ByteConverter.cs
- FormViewCommandEventArgs.cs