Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / CommonUI / System / Drawing / Advanced / EncoderParameters.cs / 1 / EncoderParameters.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Drawing.Imaging { using System.Text; using System.Runtime.InteropServices; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System; using System.Drawing.Internal; using Marshal = System.Runtime.InteropServices.Marshal; using System.Drawing; //[StructLayout(LayoutKind.Sequential)] ////// /// public sealed class EncoderParameters : IDisposable { EncoderParameter[] param; ///[To be supplied.] ////// /// public EncoderParameters(int count) { param = new EncoderParameter[count]; } ///[To be supplied.] ////// /// public EncoderParameters() { param = new EncoderParameter[1]; } ///[To be supplied.] ////// /// public EncoderParameter[] Param { // get { return param; } set { param = value; } } ///[To be supplied.] ////// Copy the EncoderParameters data into a chunk of memory to be consumed by native GDI+ code. /// /// We need to marshal the EncoderParameters info from/to native GDI+ ourselve since the definition of the managed/unmanaged classes /// are different and the native class is a bit weird. The native EncoderParameters class is defined in GDI+ as follows: /// /// class EncoderParameters { /// UINT Count; // Number of parameters in this structure /// EncoderParameter Parameter[1]; // Parameter values /// }; /// /// We don't have the 'Count' field since the managed array contains it. In order for this structure to work with more than one /// EncoderParameter we need to preallocate memory for the extra n-1 elements, something like this: /// /// EncoderParameters* pEncoderParameters = (EncoderParameters*) malloc(sizeof(EncoderParameters) + (n-1) * sizeof(EncoderParameter)); /// /// Also, in 64-bit platforms, 'Count' is aligned in 8 bytes (4 extra padding bytes) so we use IntPtr instead of Int32 to account for /// that (See VSW#451333). /// internal IntPtr ConvertToMemory() { int size = Marshal.SizeOf(typeof(EncoderParameter)); IntPtr memory = Marshal.AllocHGlobal(param.Length * size + Marshal.SizeOf(typeof(IntPtr))); if (memory == IntPtr.Zero){ throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.OutOfMemory); } Marshal.WriteIntPtr(memory, (IntPtr) param.Length); long arrayOffset = (long) memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i/// Copy the native GDI+ EncoderParameters data from a chunk of memory into a managed EncoderParameters object. /// See ConvertToMemory for more info. /// [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] internal static EncoderParameters ConvertFromMemory(IntPtr memory) { if (memory == IntPtr.Zero) { throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter); } int count = Marshal.ReadIntPtr(memory).ToInt32(); EncoderParameters p = new EncoderParameters(count); int size = Marshal.SizeOf(typeof(EncoderParameter)); long arrayOffset = (long)memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i public void Dispose() { foreach (EncoderParameter p in param) { if( p != null ){ p.Dispose(); } } param = null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Drawing.Imaging { using System.Text; using System.Runtime.InteropServices; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System; using System.Drawing.Internal; using Marshal = System.Runtime.InteropServices.Marshal; using System.Drawing; //[StructLayout(LayoutKind.Sequential)] ////// /// public sealed class EncoderParameters : IDisposable { EncoderParameter[] param; ///[To be supplied.] ////// /// public EncoderParameters(int count) { param = new EncoderParameter[count]; } ///[To be supplied.] ////// /// public EncoderParameters() { param = new EncoderParameter[1]; } ///[To be supplied.] ////// /// public EncoderParameter[] Param { // get { return param; } set { param = value; } } ///[To be supplied.] ////// Copy the EncoderParameters data into a chunk of memory to be consumed by native GDI+ code. /// /// We need to marshal the EncoderParameters info from/to native GDI+ ourselve since the definition of the managed/unmanaged classes /// are different and the native class is a bit weird. The native EncoderParameters class is defined in GDI+ as follows: /// /// class EncoderParameters { /// UINT Count; // Number of parameters in this structure /// EncoderParameter Parameter[1]; // Parameter values /// }; /// /// We don't have the 'Count' field since the managed array contains it. In order for this structure to work with more than one /// EncoderParameter we need to preallocate memory for the extra n-1 elements, something like this: /// /// EncoderParameters* pEncoderParameters = (EncoderParameters*) malloc(sizeof(EncoderParameters) + (n-1) * sizeof(EncoderParameter)); /// /// Also, in 64-bit platforms, 'Count' is aligned in 8 bytes (4 extra padding bytes) so we use IntPtr instead of Int32 to account for /// that (See VSW#451333). /// internal IntPtr ConvertToMemory() { int size = Marshal.SizeOf(typeof(EncoderParameter)); IntPtr memory = Marshal.AllocHGlobal(param.Length * size + Marshal.SizeOf(typeof(IntPtr))); if (memory == IntPtr.Zero){ throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.OutOfMemory); } Marshal.WriteIntPtr(memory, (IntPtr) param.Length); long arrayOffset = (long) memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i/// Copy the native GDI+ EncoderParameters data from a chunk of memory into a managed EncoderParameters object. /// See ConvertToMemory for more info. /// [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] internal static EncoderParameters ConvertFromMemory(IntPtr memory) { if (memory == IntPtr.Zero) { throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter); } int count = Marshal.ReadIntPtr(memory).ToInt32(); EncoderParameters p = new EncoderParameters(count); int size = Marshal.SizeOf(typeof(EncoderParameter)); long arrayOffset = (long)memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i public void Dispose() { foreach (EncoderParameter p in param) { if( p != null ){ p.Dispose(); } } param = null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PropertyManager.cs
- Validator.cs
- Stream.cs
- SchemaMerger.cs
- XmlRootAttribute.cs
- TypeConverterHelper.cs
- NativeRecognizer.cs
- ProfilePropertyNameValidator.cs
- FileLoadException.cs
- StrongNameIdentityPermission.cs
- DeclarativeCatalogPart.cs
- ADMembershipProvider.cs
- NonVisualControlAttribute.cs
- StringDictionary.cs
- TreeChangeInfo.cs
- SizeConverter.cs
- XmlTextEncoder.cs
- HostingEnvironmentSection.cs
- DataGridItem.cs
- CustomServiceCredentials.cs
- Axis.cs
- QueryBranchOp.cs
- TextBoxRenderer.cs
- ProfileService.cs
- StaticSiteMapProvider.cs
- Inflater.cs
- BindingExpressionUncommonField.cs
- DesignerFrame.cs
- TabControl.cs
- AttributeEmitter.cs
- InkCanvas.cs
- AccessViolationException.cs
- ResolveCriteria.cs
- ToggleProviderWrapper.cs
- ADConnectionHelper.cs
- TcpWorkerProcess.cs
- EntityDataSource.cs
- RemotingAttributes.cs
- CalendarTable.cs
- Compiler.cs
- DecoderBestFitFallback.cs
- AudioFileOut.cs
- SocketInformation.cs
- MemberMaps.cs
- SqlDependency.cs
- UnicastIPAddressInformationCollection.cs
- CompilerError.cs
- ClassDataContract.cs
- ParameterToken.cs
- TableColumn.cs
- NameValuePermission.cs
- DataServiceContext.cs
- ScrollItemPattern.cs
- SqlRemoveConstantOrderBy.cs
- EntityFunctions.cs
- DataDocumentXPathNavigator.cs
- ToolBarTray.cs
- PieceDirectory.cs
- FormsAuthentication.cs
- ColorTransform.cs
- UnsafeNativeMethods.cs
- ThicknessKeyFrameCollection.cs
- TypeGeneratedEventArgs.cs
- ColorKeyFrameCollection.cs
- Thickness.cs
- ManualResetEvent.cs
- Cursors.cs
- TreeViewDataItemAutomationPeer.cs
- SqlClientWrapperSmiStreamChars.cs
- OpenTypeLayoutCache.cs
- BinaryObjectInfo.cs
- RevocationPoint.cs
- IFormattable.cs
- DropSource.cs
- Sql8ConformanceChecker.cs
- ValidationError.cs
- DirectionalLight.cs
- DataGridRelationshipRow.cs
- FlowDocumentScrollViewer.cs
- NonceCache.cs
- SettingsSection.cs
- SqlParameter.cs
- DmlSqlGenerator.cs
- SequenceDesigner.cs
- RadioButtonBaseAdapter.cs
- XmlDataDocument.cs
- MenuAutomationPeer.cs
- ValidationSummaryDesigner.cs
- AVElementHelper.cs
- WebInvokeAttribute.cs
- EraserBehavior.cs
- TemplateField.cs
- XDeferredAxisSource.cs
- MimeTypeAttribute.cs
- SelectionRangeConverter.cs
- MsmqIntegrationElement.cs
- FileChangesMonitor.cs
- DispatchWrapper.cs
- TemplateBindingExtension.cs
- ScriptServiceAttribute.cs