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; Listchildren = 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, Listchildren) { 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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