DrawingGroup.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Generated / DrawingGroup.cs / 1305600 / DrawingGroup.cs

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// This file was generated, please do not edit it directly. 
// 
// Please see http://wiki/default.aspx/Microsoft.Projects.Avalon/MilCodeGen.html for more information.
// 
//---------------------------------------------------------------------------

using MS.Internal;
using MS.Internal.KnownBoxes; 
using MS.Internal.Collections;
using MS.Internal.PresentationCore; 
using MS.Utility; 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Globalization; 
using System.Reflection;
using System.Runtime.InteropServices; 
using System.ComponentModel.Design.Serialization; 
using System.Text;
using System.Windows; 
using System.Windows.Media;
using System.Windows.Media.Effects;
using System.Windows.Media.Media3D;
using System.Windows.Media.Animation; 
using System.Windows.Media.Composition;
using System.Windows.Media.Imaging; 
using System.Windows.Markup; 
using System.Windows.Media.Converters;
using System.Security; 
using System.Security.Permissions;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
// These types are aliased to match the unamanaged names used in interop 
using BOOL = System.UInt32;
using WORD = System.UInt16; 
using Float = System.Single; 

namespace System.Windows.Media 
{


 
    sealed partial class DrawingGroup : Drawing
    { 
        //----------------------------------------------------- 
        //
        //  Public Methods 
        //
        //-----------------------------------------------------

        #region Public Methods 

        ///  
        ///     Shadows inherited Clone() with a strongly typed 
        ///     version for convenience.
        ///  
        public new DrawingGroup Clone()
        {
            return (DrawingGroup)base.Clone();
        } 

        ///  
        ///     Shadows inherited CloneCurrentValue() with a strongly typed 
        ///     version for convenience.
        ///  
        public new DrawingGroup CloneCurrentValue()
        {
            return (DrawingGroup)base.CloneCurrentValue();
        } 

 
 

        #endregion Public Methods 

        //------------------------------------------------------
        //
        //  Public Properties 
        //
        //----------------------------------------------------- 
 
        private static void ChildrenPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 



 
            // The first change to the default value of a mutable collection property (e.g. GeometryGroup.Children)
            // will promote the property value from a default value to a local value. This is technically a sub-property 
            // change because the collection was changed and not a new collection set (GeometryGroup.Children. 
            // Add versus GeometryGroup.Children = myNewChildrenCollection). However, we never marshalled
            // the default value to the compositor. If the property changes from a default value, the new local value 
            // needs to be marshalled to the compositor. We detect this scenario with the second condition
            // e.OldValueSource != e.NewValueSource. Specifically in this scenario the OldValueSource will be
            // Default and the NewValueSource will be Local.
            if (e.IsASubPropertyChange && 
               (e.OldValueSource == e.NewValueSource))
            { 
                return; 
            }
 

            DrawingGroup target = ((DrawingGroup) d);

 
            // If this is both non-null and mutable, we need to unhook the Changed event.
            DrawingCollection oldCollection = null; 
            DrawingCollection newCollection = null; 

            if ((e.OldValueSource != BaseValueSourceInternal.Default) || e.IsOldValueModified) 
            {
                oldCollection = (DrawingCollection) e.OldValue;
                if ((oldCollection != null) && !oldCollection.IsFrozen)
                { 
                    oldCollection.ItemRemoved -= target.ChildrenItemRemoved;
                    oldCollection.ItemInserted -= target.ChildrenItemInserted; 
                } 
            }
 
            // If this is both non-null and mutable, we need to hook the Changed event.
            if ((e.NewValueSource != BaseValueSourceInternal.Default) || e.IsNewValueModified)
            {
                newCollection = (DrawingCollection) e.NewValue; 
                if ((newCollection != null) && !newCollection.IsFrozen)
                { 
                    newCollection.ItemInserted += target.ChildrenItemInserted; 
                    newCollection.ItemRemoved += target.ChildrenItemRemoved;
                } 
            }
            if (oldCollection != newCollection && target.Dispatcher != null)
            {
                using (CompositionEngineLock.Acquire()) 
                {
                    DUCE.IResource targetResource = (DUCE.IResource)target; 
                    int channelCount = targetResource.GetChannelCount(); 

                    for (int channelIndex = 0; channelIndex < channelCount; channelIndex++) 
                    {
                        DUCE.Channel channel = targetResource.GetChannel(channelIndex);
                        Debug.Assert(!channel.IsOutOfBandChannel);
                        Debug.Assert(!targetResource.GetHandle(channel).IsNull); 
                        // resource shouldn't be null because
                        // 1) If the field is one of our collections, we don't allow null elements 
                        // 2) Codegen already made sure the collection contains DUCE.IResources 
                        // ... so we'll Assert it
 
                        if (newCollection != null)
                        {
                            int count = newCollection.Count;
                            for (int i = 0; i < count; i++) 
                            {
                                DUCE.IResource resource = newCollection.Internal_GetItem(i) as DUCE.IResource; 
                                Debug.Assert(resource != null); 
                                resource.AddRefOnChannel(channel);
                            } 
                        }

                        if (oldCollection != null)
                        { 
                            int count = oldCollection.Count;
                            for (int i = 0; i < count; i++) 
                            { 
                                DUCE.IResource resource = oldCollection.Internal_GetItem(i) as DUCE.IResource;
                                Debug.Assert(resource != null); 
                                resource.ReleaseOnChannel(channel);
                            }
                        }
                    } 
                }
            } 
            target.PropertyChanged(ChildrenProperty); 
        }
        private static void ClipGeometryPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
        {


 

            // The first change to the default value of a mutable collection property (e.g. GeometryGroup.Children) 
            // will promote the property value from a default value to a local value. This is technically a sub-property 
            // change because the collection was changed and not a new collection set (GeometryGroup.Children.
            // Add versus GeometryGroup.Children = myNewChildrenCollection). However, we never marshalled 
            // the default value to the compositor. If the property changes from a default value, the new local value
            // needs to be marshalled to the compositor. We detect this scenario with the second condition
            // e.OldValueSource != e.NewValueSource. Specifically in this scenario the OldValueSource will be
            // Default and the NewValueSource will be Local. 
            if (e.IsASubPropertyChange &&
               (e.OldValueSource == e.NewValueSource)) 
            { 
                return;
            } 


            DrawingGroup target = ((DrawingGroup) d);
 

            Geometry oldV = (Geometry) e.OldValue; 
            Geometry newV = (Geometry) e.NewValue; 
            System.Windows.Threading.Dispatcher dispatcher = target.Dispatcher;
 
            if (dispatcher != null)
            {
                DUCE.IResource targetResource = (DUCE.IResource)target;
                using (CompositionEngineLock.Acquire()) 
                {
                    int channelCount = targetResource.GetChannelCount(); 
 
                    for (int channelIndex = 0; channelIndex < channelCount; channelIndex++)
                    { 
                        DUCE.Channel channel = targetResource.GetChannel(channelIndex);
                        Debug.Assert(!channel.IsOutOfBandChannel);
                        Debug.Assert(!targetResource.GetHandle(channel).IsNull);
                        target.ReleaseResource(oldV,channel); 
                        target.AddRefResource(newV,channel);
                    } 
                } 
            }
 
            target.PropertyChanged(ClipGeometryProperty);
        }
        private static void OpacityPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 
            DrawingGroup target = ((DrawingGroup) d);
 
 
            target.PropertyChanged(OpacityProperty);
        } 
        private static void OpacityMaskPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {

 

 
            // The first change to the default value of a mutable collection property (e.g. GeometryGroup.Children) 
            // will promote the property value from a default value to a local value. This is technically a sub-property
            // change because the collection was changed and not a new collection set (GeometryGroup.Children. 
            // Add versus GeometryGroup.Children = myNewChildrenCollection). However, we never marshalled
            // the default value to the compositor. If the property changes from a default value, the new local value
            // needs to be marshalled to the compositor. We detect this scenario with the second condition
            // e.OldValueSource != e.NewValueSource. Specifically in this scenario the OldValueSource will be 
            // Default and the NewValueSource will be Local.
            if (e.IsASubPropertyChange && 
               (e.OldValueSource == e.NewValueSource)) 
            {
                return; 
            }


            DrawingGroup target = ((DrawingGroup) d); 

 
            Brush oldV = (Brush) e.OldValue; 
            Brush newV = (Brush) e.NewValue;
            System.Windows.Threading.Dispatcher dispatcher = target.Dispatcher; 

            if (dispatcher != null)
            {
                DUCE.IResource targetResource = (DUCE.IResource)target; 
                using (CompositionEngineLock.Acquire())
                { 
                    int channelCount = targetResource.GetChannelCount(); 

                    for (int channelIndex = 0; channelIndex < channelCount; channelIndex++) 
                    {
                        DUCE.Channel channel = targetResource.GetChannel(channelIndex);
                        Debug.Assert(!channel.IsOutOfBandChannel);
                        Debug.Assert(!targetResource.GetHandle(channel).IsNull); 
                        target.ReleaseResource(oldV,channel);
                        target.AddRefResource(newV,channel); 
                    } 
                }
            } 

            target.PropertyChanged(OpacityMaskProperty);
        }
        private static void TransformPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
        {
 
 

 
            // The first change to the default value of a mutable collection property (e.g. GeometryGroup.Children)
            // will promote the property value from a default value to a local value. This is technically a sub-property
            // change because the collection was changed and not a new collection set (GeometryGroup.Children.
            // Add versus GeometryGroup.Children = myNewChildrenCollection). However, we never marshalled 
            // the default value to the compositor. If the property changes from a default value, the new local value
            // needs to be marshalled to the compositor. We detect this scenario with the second condition 
            // e.OldValueSource != e.NewValueSource. Specifically in this scenario the OldValueSource will be 
            // Default and the NewValueSource will be Local.
            if (e.IsASubPropertyChange && 
               (e.OldValueSource == e.NewValueSource))
            {
                return;
            } 

 
            DrawingGroup target = ((DrawingGroup) d); 

 
            Transform oldV = (Transform) e.OldValue;
            Transform newV = (Transform) e.NewValue;
            System.Windows.Threading.Dispatcher dispatcher = target.Dispatcher;
 
            if (dispatcher != null)
            { 
                DUCE.IResource targetResource = (DUCE.IResource)target; 
                using (CompositionEngineLock.Acquire())
                { 
                    int channelCount = targetResource.GetChannelCount();

                    for (int channelIndex = 0; channelIndex < channelCount; channelIndex++)
                    { 
                        DUCE.Channel channel = targetResource.GetChannel(channelIndex);
                        Debug.Assert(!channel.IsOutOfBandChannel); 
                        Debug.Assert(!targetResource.GetHandle(channel).IsNull); 
                        target.ReleaseResource(oldV,channel);
                        target.AddRefResource(newV,channel); 
                    }
                }
            }
 
            target.PropertyChanged(TransformProperty);
        } 
        private static void GuidelineSetPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
        {
 



            // The first change to the default value of a mutable collection property (e.g. GeometryGroup.Children) 
            // will promote the property value from a default value to a local value. This is technically a sub-property
            // change because the collection was changed and not a new collection set (GeometryGroup.Children. 
            // Add versus GeometryGroup.Children = myNewChildrenCollection). However, we never marshalled 
            // the default value to the compositor. If the property changes from a default value, the new local value
            // needs to be marshalled to the compositor. We detect this scenario with the second condition 
            // e.OldValueSource != e.NewValueSource. Specifically in this scenario the OldValueSource will be
            // Default and the NewValueSource will be Local.
            if (e.IsASubPropertyChange &&
               (e.OldValueSource == e.NewValueSource)) 
            {
                return; 
            } 

 
            DrawingGroup target = ((DrawingGroup) d);


            GuidelineSet oldV = (GuidelineSet) e.OldValue; 
            GuidelineSet newV = (GuidelineSet) e.NewValue;
            System.Windows.Threading.Dispatcher dispatcher = target.Dispatcher; 
 
            if (dispatcher != null)
            { 
                DUCE.IResource targetResource = (DUCE.IResource)target;
                using (CompositionEngineLock.Acquire())
                {
                    int channelCount = targetResource.GetChannelCount(); 

                    for (int channelIndex = 0; channelIndex < channelCount; channelIndex++) 
                    { 
                        DUCE.Channel channel = targetResource.GetChannel(channelIndex);
                        Debug.Assert(!channel.IsOutOfBandChannel); 
                        Debug.Assert(!targetResource.GetHandle(channel).IsNull);
                        target.ReleaseResource(oldV,channel);
                        target.AddRefResource(newV,channel);
                    } 
                }
            } 
 
            target.PropertyChanged(GuidelineSetProperty);
        } 
        private static void EdgeModePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            DrawingGroup target = ((DrawingGroup) d);
 

            target.PropertyChanged(RenderOptions.EdgeModeProperty); 
        } 
        private static void BitmapEffectPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 



 
            DrawingGroup target = ((DrawingGroup) d);
 
 
            target.PropertyChanged(BitmapEffectProperty);
        } 
        private static void BitmapEffectInputPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {

 

 
            DrawingGroup target = ((DrawingGroup) d); 

 
            target.PropertyChanged(BitmapEffectInputProperty);
        }
        private static void BitmapScalingModePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 
            DrawingGroup target = ((DrawingGroup) d);
 
 
            target.PropertyChanged(RenderOptions.BitmapScalingModeProperty);
        } 
        private static void ClearTypeHintPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            DrawingGroup target = ((DrawingGroup) d);
 

            target.PropertyChanged(RenderOptions.ClearTypeHintProperty); 
        } 

 
        #region Public Properties

        /// 
        ///     Children - DrawingCollection.  Default value is new FreezableDefaultValueFactory(DrawingCollection.Empty). 
        /// 
        public DrawingCollection Children 
        { 
            get
            { 
                return (DrawingCollection) GetValue(ChildrenProperty);
            }
            set
            { 
                SetValueInternal(ChildrenProperty, value);
            } 
        } 

        ///  
        ///     ClipGeometry - Geometry.  Default value is null.
        /// 
        public Geometry ClipGeometry
        { 
            get
            { 
                return (Geometry) GetValue(ClipGeometryProperty); 
            }
            set 
            {
                SetValueInternal(ClipGeometryProperty, value);
            }
        } 

        ///  
        ///     Opacity - double.  Default value is 1.0. 
        /// 
        public double Opacity 
        {
            get
            {
                return (double) GetValue(OpacityProperty); 
            }
            set 
            { 
                SetValueInternal(OpacityProperty, value);
            } 
        }

        /// 
        ///     OpacityMask - Brush.  Default value is null. 
        /// 
        public Brush OpacityMask 
        { 
            get
            { 
                return (Brush) GetValue(OpacityMaskProperty);
            }
            set
            { 
                SetValueInternal(OpacityMaskProperty, value);
            } 
        } 

        ///  
        ///     Transform - Transform.  Default value is null.
        /// 
        public Transform Transform
        { 
            get
            { 
                return (Transform) GetValue(TransformProperty); 
            }
            set 
            {
                SetValueInternal(TransformProperty, value);
            }
        } 

        ///  
        ///     GuidelineSet - GuidelineSet.  Default value is null. 
        /// 
        public GuidelineSet GuidelineSet 
        {
            get
            {
                return (GuidelineSet) GetValue(GuidelineSetProperty); 
            }
            set 
            { 
                SetValueInternal(GuidelineSetProperty, value);
            } 
        }

        /// 
        ///     BitmapEffect - BitmapEffect.  Default value is null. 
        /// 
        public BitmapEffect BitmapEffect 
        { 
            get
            { 
                return (BitmapEffect) GetValue(BitmapEffectProperty);
            }
            set
            { 
                SetValueInternal(BitmapEffectProperty, value);
            } 
        } 

        ///  
        ///     BitmapEffectInput - BitmapEffectInput.  Default value is null.
        /// 
        public BitmapEffectInput BitmapEffectInput
        { 
            get
            { 
                return (BitmapEffectInput) GetValue(BitmapEffectInputProperty); 
            }
            set 
            {
                SetValueInternal(BitmapEffectInputProperty, value);
            }
        } 

        #endregion Public Properties 
 
        //------------------------------------------------------
        // 
        //  Protected Methods
        //
        //------------------------------------------------------
 
        #region Protected Methods
 
        ///  
        /// Implementation of Freezable.CreateInstanceCore.
        ///  
        /// The new Freezable.
        protected override Freezable CreateInstanceCore()
        {
            return new DrawingGroup(); 
        }
 
 

        #endregion ProtectedMethods 

        //-----------------------------------------------------
        //
        //  Internal Methods 
        //
        //------------------------------------------------------ 
 
        #region Internal Methods
 
        /// 
        ///     Critical: This code calls into an unsafe code block
        ///     TreatAsSafe: This code does not return any critical data.It is ok to expose
        ///     Channels are safe to call into and do not go cross domain and cross process 
        /// 
        [SecurityCritical,SecurityTreatAsSafe] 
        internal override void UpdateResource(DUCE.Channel channel, bool skipOnChannelCheck) 
        {
            // If we're told we can skip the channel check, then we must be on channel 
            Debug.Assert(!skipOnChannelCheck || _duceResource.IsOnChannel(channel));

            if (skipOnChannelCheck || _duceResource.IsOnChannel(channel))
            { 
                base.UpdateResource(channel, skipOnChannelCheck);
 
                // Read values of properties into local variables 
                DrawingCollection vChildren = Children;
                Geometry vClipGeometry = ClipGeometry; 
                Brush vOpacityMask = OpacityMask;
                Transform vTransform = Transform;
                GuidelineSet vGuidelineSet = GuidelineSet;
 
                // Obtain handles for properties that implement DUCE.IResource
                DUCE.ResourceHandle hClipGeometry = vClipGeometry != null ? ((DUCE.IResource)vClipGeometry).GetHandle(channel) : DUCE.ResourceHandle.Null; 
                DUCE.ResourceHandle hOpacityMask = vOpacityMask != null ? ((DUCE.IResource)vOpacityMask).GetHandle(channel) : DUCE.ResourceHandle.Null; 
                DUCE.ResourceHandle hTransform;
                if (vTransform == null || 
                    Object.ReferenceEquals(vTransform, Transform.Identity)
                    )
                {
                    hTransform = DUCE.ResourceHandle.Null; 
                }
                else 
                { 
                    hTransform = ((DUCE.IResource)vTransform).GetHandle(channel);
                } 
                DUCE.ResourceHandle hGuidelineSet = vGuidelineSet != null ? ((DUCE.IResource)vGuidelineSet).GetHandle(channel) : DUCE.ResourceHandle.Null;

                // Obtain handles for animated properties
                DUCE.ResourceHandle hOpacityAnimations = GetAnimationResourceHandle(OpacityProperty, channel); 

                // Store the count of this resource's contained collections in local variables. 
                int ChildrenCount = (vChildren == null) ? 0 : vChildren.Count; 

                // Pack & send command packet 
                DUCE.MILCMD_DRAWINGGROUP data;
                unsafe
                {
                    data.Type = MILCMD.MilCmdDrawingGroup; 
                    data.Handle = _duceResource.GetHandle(channel);
                    data.ChildrenSize = (uint)(sizeof(DUCE.ResourceHandle) * ChildrenCount); 
                    data.hClipGeometry = hClipGeometry; 
                    if (hOpacityAnimations.IsNull)
                    { 
                        data.Opacity = Opacity;
                    }
                    data.hOpacityAnimations = hOpacityAnimations;
                    data.hOpacityMask = hOpacityMask; 
                    data.hTransform = hTransform;
                    data.hGuidelineSet = hGuidelineSet; 
                    data.EdgeMode = (EdgeMode)GetValue(RenderOptions.EdgeModeProperty); 
                    data.bitmapScalingMode = (BitmapScalingMode)GetValue(RenderOptions.BitmapScalingModeProperty);
                    data.ClearTypeHint = (ClearTypeHint)GetValue(RenderOptions.ClearTypeHintProperty); 

                    channel.BeginCommand(
                        (byte*)&data,
                        sizeof(DUCE.MILCMD_DRAWINGGROUP), 
                        (int)(data.ChildrenSize)
                        ); 
 

                    // Copy this collection's elements (or their handles) to reserved data 
                    for(int i = 0; i < ChildrenCount; i++)
                    {
                        DUCE.ResourceHandle resource = ((DUCE.IResource)vChildren.Internal_GetItem(i)).GetHandle(channel);;
                        channel.AppendCommandData( 
                            (byte*)&resource,
                            sizeof(DUCE.ResourceHandle) 
                            ); 
                    }
 
                    channel.EndCommand();
                }
            }
        } 
        internal override DUCE.ResourceHandle AddRefOnChannelCore(DUCE.Channel channel)
        { 
 
                if (_duceResource.CreateOrAddRefOnChannel(this, channel, System.Windows.Media.Composition.DUCE.ResourceType.TYPE_DRAWINGGROUP))
                { 
                    Geometry vClipGeometry = ClipGeometry;
                    if (vClipGeometry != null) ((DUCE.IResource)vClipGeometry).AddRefOnChannel(channel);
                    Brush vOpacityMask = OpacityMask;
                    if (vOpacityMask != null) ((DUCE.IResource)vOpacityMask).AddRefOnChannel(channel); 
                    Transform vTransform = Transform;
                    if (vTransform != null) ((DUCE.IResource)vTransform).AddRefOnChannel(channel); 
                    GuidelineSet vGuidelineSet = GuidelineSet; 
                    if (vGuidelineSet != null) ((DUCE.IResource)vGuidelineSet).AddRefOnChannel(channel);
 
                    DrawingCollection vChildren = Children;

                    if (vChildren != null)
                    { 
                        int count = vChildren.Count;
                        for (int i = 0; i < count; i++) 
                        { 
                            ((DUCE.IResource) vChildren.Internal_GetItem(i)).AddRefOnChannel(channel);
                        } 
                    }
                    AddRefOnChannelAnimations(channel);

 
                    UpdateResource(channel, true /* skip "on channel" check - we already know that we're on channel */ );
                } 
 
                return _duceResource.GetHandle(channel);
 
        }
        internal override void ReleaseOnChannelCore(DUCE.Channel channel)
        {
 
                Debug.Assert(_duceResource.IsOnChannel(channel));
 
                if (_duceResource.ReleaseOnChannel(channel)) 
                {
                    Geometry vClipGeometry = ClipGeometry; 
                    if (vClipGeometry != null) ((DUCE.IResource)vClipGeometry).ReleaseOnChannel(channel);
                    Brush vOpacityMask = OpacityMask;
                    if (vOpacityMask != null) ((DUCE.IResource)vOpacityMask).ReleaseOnChannel(channel);
                    Transform vTransform = Transform; 
                    if (vTransform != null) ((DUCE.IResource)vTransform).ReleaseOnChannel(channel);
                    GuidelineSet vGuidelineSet = GuidelineSet; 
                    if (vGuidelineSet != null) ((DUCE.IResource)vGuidelineSet).ReleaseOnChannel(channel); 

                    DrawingCollection vChildren = Children; 

                    if (vChildren != null)
                    {
                        int count = vChildren.Count; 
                        for (int i = 0; i < count; i++)
                        { 
                            ((DUCE.IResource) vChildren.Internal_GetItem(i)).ReleaseOnChannel(channel); 
                        }
                    } 
                    ReleaseOnChannelAnimations(channel);

                }
 
        }
        internal override DUCE.ResourceHandle GetHandleCore(DUCE.Channel channel) 
        { 
            // Note that we are in a lock here already.
            return _duceResource.GetHandle(channel); 
        }
        internal override int GetChannelCountCore()
        {
            // must already be in composition lock here 
            return _duceResource.GetChannelCount();
        } 
        internal override DUCE.Channel GetChannelCore(int index) 
        {
            // Note that we are in a lock here already. 
            return _duceResource.GetChannel(index);
        }

        private void ChildrenItemInserted(object sender, object item) 
        {
            if (this.Dispatcher != null) 
            { 
                DUCE.IResource thisResource = (DUCE.IResource)this;
                using (CompositionEngineLock.Acquire()) 
                {
                    int channelCount = thisResource.GetChannelCount();

                    for (int channelIndex = 0; channelIndex < channelCount; channelIndex++) 
                    {
                        DUCE.Channel channel = thisResource.GetChannel(channelIndex); 
                        Debug.Assert(!channel.IsOutOfBandChannel); 
                        Debug.Assert(!thisResource.GetHandle(channel).IsNull);
 
                        // We're on a channel, which means our dependents are also on the channel.
                        DUCE.IResource addResource = item as DUCE.IResource;
                        if (addResource != null)
                        { 
                            addResource.AddRefOnChannel(channel);
                        } 
 
                        UpdateResource(channel, true /* skip on channel check */);
                    } 
                }
            }
        }
 
        private void ChildrenItemRemoved(object sender, object item)
        { 
            if (this.Dispatcher != null) 
            {
                DUCE.IResource thisResource = (DUCE.IResource)this; 
                using (CompositionEngineLock.Acquire())
                {
                    int channelCount = thisResource.GetChannelCount();
 
                    for (int channelIndex = 0; channelIndex < channelCount; channelIndex++)
                    { 
                        DUCE.Channel channel = thisResource.GetChannel(channelIndex); 
                        Debug.Assert(!channel.IsOutOfBandChannel);
                        Debug.Assert(!thisResource.GetHandle(channel).IsNull); 

                        UpdateResource(channel, true /* is on channel check */);

                        // We're on a channel, which means our dependents are also on the channel. 
                        DUCE.IResource releaseResource = item as DUCE.IResource;
                        if (releaseResource != null) 
                        { 
                            releaseResource.ReleaseOnChannel(channel);
                        } 
                    }
                }
            }
        } 

        #endregion Internal Methods 
 
        //-----------------------------------------------------
        // 
        //  Internal Properties
        //
        //-----------------------------------------------------
 
        #region Internal Properties
 
 

 

        #endregion Internal Properties

        //----------------------------------------------------- 
        //
        //  Dependency Properties 
        // 
        //------------------------------------------------------
 
        #region Dependency Properties

        /// 
        ///     The DependencyProperty for the DrawingGroup.Children property. 
        /// 
        public static readonly DependencyProperty ChildrenProperty; 
        ///  
        ///     The DependencyProperty for the DrawingGroup.ClipGeometry property.
        ///  
        public static readonly DependencyProperty ClipGeometryProperty;
        /// 
        ///     The DependencyProperty for the DrawingGroup.Opacity property.
        ///  
        public static readonly DependencyProperty OpacityProperty;
        ///  
        ///     The DependencyProperty for the DrawingGroup.OpacityMask property. 
        /// 
        public static readonly DependencyProperty OpacityMaskProperty; 
        /// 
        ///     The DependencyProperty for the DrawingGroup.Transform property.
        /// 
        public static readonly DependencyProperty TransformProperty; 
        /// 
        ///     The DependencyProperty for the DrawingGroup.GuidelineSet property. 
        ///  
        public static readonly DependencyProperty GuidelineSetProperty;
        ///  
        ///     The DependencyProperty for the DrawingGroup.BitmapEffect property.
        /// 
        public static readonly DependencyProperty BitmapEffectProperty;
        ///  
        ///     The DependencyProperty for the DrawingGroup.BitmapEffectInput property.
        ///  
        public static readonly DependencyProperty BitmapEffectInputProperty; 

        #endregion Dependency Properties 

        //-----------------------------------------------------
        //
        //  Internal Fields 
        //
        //------------------------------------------------------ 
 
        #region Internal Fields
 


        internal System.Windows.Media.Composition.DUCE.MultiChannelResource _duceResource = new System.Windows.Media.Composition.DUCE.MultiChannelResource();
 
        internal static DrawingCollection s_Children = DrawingCollection.Empty;
        internal const double c_Opacity = 1.0; 
        internal const EdgeMode c_EdgeMode = EdgeMode.Unspecified; 
        internal const BitmapScalingMode c_BitmapScalingMode = BitmapScalingMode.Unspecified;
        internal const ClearTypeHint c_ClearTypeHint = ClearTypeHint.Auto; 

        #endregion Internal Fields

 

        #region Constructors 
 
        //------------------------------------------------------
        // 
        //  Constructors
        //
        //-----------------------------------------------------
 
        static DrawingGroup()
        { 
            // We check our static default fields which are of type Freezable 
            // to make sure that they are not mutable, otherwise we will throw
            // if these get touched by more than one thread in the lifetime 
            // of your app.  (Windows OS Bug #947272)
            //
            Debug.Assert(s_Children == null || s_Children.IsFrozen,
                "Detected context bound default value DrawingGroup.s_Children (See OS Bug #947272)."); 

 
            RenderOptions.EdgeModeProperty.OverrideMetadata( 
                typeof(DrawingGroup),
                new UIPropertyMetadata(EdgeMode.Unspecified, 
                                       new PropertyChangedCallback(EdgeModePropertyChanged)));

            RenderOptions.BitmapScalingModeProperty.OverrideMetadata(
                typeof(DrawingGroup), 
                new UIPropertyMetadata(BitmapScalingMode.Unspecified,
                                       new PropertyChangedCallback(BitmapScalingModePropertyChanged))); 
 
            RenderOptions.ClearTypeHintProperty.OverrideMetadata(
                typeof(DrawingGroup), 
                new UIPropertyMetadata(ClearTypeHint.Auto,
                                       new PropertyChangedCallback(ClearTypeHintPropertyChanged)));

            // Initializations 
            Type typeofThis = typeof(DrawingGroup);
            ChildrenProperty = 
                  RegisterProperty("Children", 
                                   typeof(DrawingCollection),
                                   typeofThis, 
                                   new FreezableDefaultValueFactory(DrawingCollection.Empty),
                                   new PropertyChangedCallback(ChildrenPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ false, 
                                   /* coerceValueCallback */ null);
            ClipGeometryProperty = 
                  RegisterProperty("ClipGeometry", 
                                   typeof(Geometry),
                                   typeofThis, 
                                   null,
                                   new PropertyChangedCallback(ClipGeometryPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ false, 
                                   /* coerceValueCallback */ null);
            OpacityProperty = 
                  RegisterProperty("Opacity", 
                                   typeof(double),
                                   typeofThis, 
                                   1.0,
                                   new PropertyChangedCallback(OpacityPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ true, 
                                   /* coerceValueCallback */ null);
            OpacityMaskProperty = 
                  RegisterProperty("OpacityMask", 
                                   typeof(Brush),
                                   typeofThis, 
                                   null,
                                   new PropertyChangedCallback(OpacityMaskPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ false, 
                                   /* coerceValueCallback */ null);
            TransformProperty = 
                  RegisterProperty("Transform", 
                                   typeof(Transform),
                                   typeofThis, 
                                   null,
                                   new PropertyChangedCallback(TransformPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ false, 
                                   /* coerceValueCallback */ null);
            GuidelineSetProperty = 
                  RegisterProperty("GuidelineSet", 
                                   typeof(GuidelineSet),
                                   typeofThis, 
                                   null,
                                   new PropertyChangedCallback(GuidelineSetPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ false, 
                                   /* coerceValueCallback */ null);
            BitmapEffectProperty = 
                  RegisterProperty("BitmapEffect", 
                                   typeof(BitmapEffect),
                                   typeofThis, 
                                   null,
                                   new PropertyChangedCallback(BitmapEffectPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ false, 
                                   /* coerceValueCallback */ null);
            BitmapEffectInputProperty = 
                  RegisterProperty("BitmapEffectInput", 
                                   typeof(BitmapEffectInput),
                                   typeofThis, 
                                   null,
                                   new PropertyChangedCallback(BitmapEffectInputPropertyChanged),
                                   null,
                                   /* isIndependentlyAnimated  = */ false, 
                                   /* coerceValueCallback */ null);
        } 
 

 
        #endregion Constructors

    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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