BitmapEffectGroup.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Effects / BitmapEffectGroup.cs / 1 / BitmapEffectGroup.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2005
//
//  File:       BitmapEffectGroup.cs 
//-----------------------------------------------------------------------------
 
using System; 
using System.Windows;
using System.Windows.Media; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Reflection;
using System.Collections; 
using System.Collections.Generic;
using MS.Internal; 
using System.Windows.Media.Animation; 
using System.Globalization;
using System.Text; 
using System.Runtime.InteropServices;
using System.Windows.Markup;
using System.Windows.Media.Composition;
using System.Diagnostics; 

using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID; 

 
namespace System.Windows.Media.Effects
{
    /// 
    /// This contains the managed effect object and 
    /// a corresponding unmanaged handle
    ///  
    internal struct BitmapEffectHandle 
    {
        public BitmapEffect effect; 
        public SafeHandle handle;

        public BitmapEffectHandle(BitmapEffect e, SafeHandle h)
        { 
            effect = e;
            handle = h; 
        } 
    }
 
    /// 
    /// The class defintion for BitmapEffectGroup
    /// 
    [ContentProperty("Children")] 
    public sealed partial class BitmapEffectGroup : BitmapEffect
    { 
        List _childrenHandles; 
        Dictionary> _mapGroupToChildren;
 
        /// 
        ///
        /// 
        public BitmapEffectGroup() 
        {
            _mapGroupToChildren = new Dictionary>(); 
        } 

        ///  
        /// 1. Updates (propagates) the properties to the unmanaged handle of all
        /// the child effects
        /// 2. Sets up all the connections
        /// 3. Wraps the list with the aggregate effect 
        /// 
        /// Unmanaged handle for aggregate effect 
        protected override void UpdateUnmanagedPropertyState(SafeHandle unmanagedEffect) 
        {
            // if the group has no children, there is nothing to update 
            if (Children == null || Children.Count <= 0)
                return;

            List children = GetChildrenHandles(unmanagedEffect); 

            for (int i = 0; i < children.Count; i++) 
            { 
                children[i].effect.Internal_UpdateUnmanagedPropertyState(children[i].handle);
            } 

            SetupConnections(unmanagedEffect, children);
        }
 
        /// 
        /// Setup the connections 
        ///  
        private void SetupConnections(SafeHandle unmanagedEffect, List children)
        { 
            if (!_connectionsSetup)
            {
                // find the first effect that has both inputs and outputs
                BitmapEffectHandle firstEffect = children[0]; 
                int index = 0;
                for (; index < children.Count; index++) 
                { 
                    if (BitmapEffect.GetNumberInputs(children[index].handle) >= 1 &&
                        BitmapEffect.GetNumberOutputs(children[index].handle) >= 1) 
                    {
                        firstEffect = children[index];
                        break;
                    } 
                }
 
                if (index >= children.Count) 
                    return;
 
                BitmapEffectHandle lastEffect = firstEffect;
                // update the connections
                for (int i = index + 1; i < children.Count; i++)
                { 
                    // skip any effects that don't have inputs or outputs
                    if (BitmapEffect.GetNumberInputs(children[i].handle) < 1 || 
                        BitmapEffect.GetNumberOutputs(children[i].handle) < 1) 
                        continue;
 
                    BitmapEffect.GetInputConnector(children[i].handle, 0).ConnectTo(
                        BitmapEffect.GetOutputConnector(lastEffect.handle, 0));
                    lastEffect = children[i];
                } 

                // we should have already handled these cases 
                Debug.Assert(BitmapEffect.GetNumberInputs(firstEffect.handle) >= 1); 
                Debug.Assert(BitmapEffect.GetNumberOutputs(lastEffect.handle) >= 1);
 

                BitmapEffect.GetInputConnector(firstEffect.handle, 0).ConnectTo(
                    BitmapEffect.GetInteriorInputConnector(unmanagedEffect, 0));
                BitmapEffect.GetInteriorOutputConnector(unmanagedEffect, 0).ConnectTo( 
                    BitmapEffect.GetOutputConnector(lastEffect.handle, 0));
                BitmapEffect.Add(unmanagedEffect, lastEffect.handle); 
 
                _connectionsSetup = true;
            } 
        }

        /// 
        /// Resets the cache of unmanaged effects 
        /// 
        internal void ChildrenPropertyChangedHook(DependencyPropertyChangedEventArgs e) 
        { 
            // we are caching the unmanaged effects, so if the collection changes
            // we want to throw away the cache 
            _childrenHandles = null;
            UnmanagedEffectGroup = null;
            _mapGroupToChildren.Clear();
            _connectionsSetup = false; 
        }
 
        ///  
        /// Returns a list of the child effect handles, given the unmanaged
        /// aggregate handle. 
        /// 
        /// unmanaged aggregate handle
        /// 
        private List GetChildrenHandles(SafeHandle unmanagedEffect) 
        {
            if (UnmanagedEffectGroup == unmanagedEffect) 
            { 
                if (_childrenHandles == null)
                { 
                    _childrenHandles = CreateEffectHandleList();
                }
                return _childrenHandles;
            } 

            if (_mapGroupToChildren[unmanagedEffect] == null) 
            { 
                _mapGroupToChildren[unmanagedEffect] = CreateEffectHandleList();
            } 

            return _mapGroupToChildren[unmanagedEffect];
        }
 
        /// 
        /// Creates a list of unmanaged effect handles from the list of BitmapEffect children 
        ///  
        /// 
        private List CreateEffectHandleList() 
        {
            if (Children == null)
                return null;
 
            List handles = new List(Children.Count);
            foreach (BitmapEffect e in Children) 
            { 
                handles.Add(new BitmapEffectHandle(e, e.Internal_CreateUnmanagedEffect()));
            } 

            return handles;
        }
        ///  
        /// Updates (propagates) the properties for the aggreagate effect.
        /// 
        /// This is called only if GetOutput is called directly on the BitmapEffectGroup 
        /// object.
        ///  
        /// 
        internal override bool UpdateUnmanagedGroupState()
        {
            if (Children == null || Children.Count <= 0) 
                return false;
 
            UpdateUnmanagedPropertyState(UnmanagedEffectGroup); 

            if (BitmapEffect.GetNumberInputs(UnmanagedEffectGroup) < 1 || 
                BitmapEffect.GetNumberOutputs(UnmanagedEffectGroup) < 1)
            {
                return false;
            } 

            return true; 
        } 

        ///  
        /// Create an unmanaged handle for the group effect
        /// 
        /// 
        protected override unsafe SafeHandle CreateUnmanagedEffect() 
        {
            SafeMILHandle effect = Create(new Guid("AC9C1A9A-7E18-4F64-AC7E-47CF7F051E95")); 
            _mapGroupToChildren.Add(effect, null); 
            return effect;
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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BitmapEffectGroup.cs source code in C# .NET

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