BitmapEffectvisualstate.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 / BitmapEffectvisualstate.cs / 1 / BitmapEffectvisualstate.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2005
//
//  File:       BitmapEffectVisualState.cs 
//-----------------------------------------------------------------------------
 
using System; 
using System.Windows.Threading;
 
using MS.Win32;
using System.Security;
using System.Security.Permissions;
using System.Windows.Media; 
using System.Windows.Media.Animation;
using System.Windows.Media.Composition; 
using System.Windows.Media.Imaging; 
using System.Diagnostics;
using System.Collections; 
using System.Collections.Generic;
using MS.Internal;
using System.Resources;
using MS.Utility; 
using System.Runtime.InteropServices;
using MS.Internal.PresentationCore; 
 
using SR = MS.Internal.PresentationCore.SR;
using SRID = MS.Internal.PresentationCore.SRID; 

namespace System.Windows.Media.Effects
{
    ///  
    /// This class is used to realize the content of the
    /// visual if a bitmap effect is applied to it 
    ///  
    internal class BitmapEffectContent : IRealizationContextClient
    { 
        Visual _visual;
        List _channels;

        public BitmapEffectContent(Visual v, RealizationContext ctx) 
        {
            _visual = v; 
            _channels = ctx.Channels; 
        }
 
        public void ExecuteRealizationsUpdate()
        {
            Visual.BitmapEffectStateField.GetValue(_visual).RenderBitmapEffect(_visual, _channels);
        } 
    }
 
    ///  
    ///
    ///  
    internal class BitmapEffectVisualState : BitmapEffectState
    {
        public BitmapEffectVisualState()
        { 

        } 
 
        public BitmapEffectDrawing BitmapEffectDrawing
        { 
            get
            {
                if (_bitmapEffectDrawing == null)
                { 
                    _bitmapEffectDrawing = new BitmapEffectDrawing();
                } 
 
                return _bitmapEffectDrawing;
            } 
            set
            {
                _bitmapEffectDrawing = null;
            } 
        }
 
 
        /// 
        /// Remove the content from the composition node 
        /// 
        /// 
        /// 
        internal void FreeContent(Visual visual, DUCE.Channel channel) 
        {
            SetContent(null, visual, channel); 
            _bitmapEffectDrawing = null; 
        }
 

        /// 
        /// This sets the content of the visual if there is a
        /// bitmap effect applied to it 
        /// 
        /// drawing content 
        /// The visual 
        /// The channel
        internal void SetContent(IDrawingContent content, Visual visual, DUCE.Channel channel) 
        {
            DUCE.ResourceHandle visualHandle =
                ((DUCE.IResource)visual).GetHandle(channel);
 
            if (content != null)
            { 
                content.AddRefOnChannel(channel); 

                DUCE.CompositionNode.SetContent( 
                    visualHandle,
                    content.GetHandle(channel),
                    channel);
 
                // it is ok to release here, because the unmanaged code
                // holds a reference to the content and will release it 
                // when the parent object is released or the content 
                // is reset to null
                content.ReleaseOnChannel(channel); 
            }
            else
            {
                Debug.Assert(visual.IsOnChannel(channel)); 

                DUCE.CompositionNode.SetContent( 
                    visualHandle, 
                    DUCE.ResourceHandle.Null,
                    channel); 
            }
        }

 

        ///  
        /// This methods renders the visual to a bitmap, then applies 
        /// the effect to the rendered bitmap, and sets the content
        /// of the visual to be the resulting bitmap 
        /// 
        /// The visual to apply the effect to
        /// The current channels
        internal void RenderBitmapEffect(Visual visual, List channels) 
        {
            if (_bitmapEffect == null) 
                throw new InvalidOperationException(SR.Get(SRID.Visual_No_Effect, null)); 

            Debug.Assert(channels.Count >= 1); 
            Debug.Assert(channels[0].Channel != null);

            BitmapEffectDrawing.UpdateTransformAndDrawingLists(true);
 
            bool effectRendered = false;
            int drawingsCount = BitmapEffectDrawing.Drawings.Count; 
            for (int iTransform = BitmapEffectDrawing.WorldTransforms.Count - 1; 
                     iTransform >= drawingsCount; iTransform--)
            { 
                Matrix finalTransform = BitmapEffectDrawing.WorldTransforms[iTransform].Value;

                BitmapSource outputImage = GetEffectOutput(visual, ref _renderBitmap, finalTransform, BitmapEffectDrawing.WindowClip, out finalTransform);
 
                if (outputImage != null)
                { 
                    // if there was no group for that transform create one 
                    // and update it, otherwise we don't need to do anything it
 
                    // NOTE: this is ok to update here since it is not
                    // connected to the visual tree
                    DrawingGroup effectGroup = new DrawingGroup();
                    effectGroup.Children.Add( new ImageDrawing(outputImage, 
                        new Rect(0, 0, outputImage.Width, outputImage.Height)));
                    effectGroup.Transform = new MatrixTransform(finalTransform); 
                    BitmapEffectDrawing.Drawings.Insert(drawingsCount, effectGroup); 
                    effectRendered = true;
                } 
                else
                {
                    BitmapEffectDrawing.WorldTransforms.RemoveAt(iTransform);
                } 
            }
 
            if (BitmapEffectDrawing.Drawings.Count > 0 && effectRendered == true) 
            {
                foreach(DUCE.ChannelSet channelSet in channels) 
                {
                    SetContent(BitmapEffectDrawing, visual, channelSet.Channel);
                }
            } 

            // reset the dirty flag 
            // we have already rendered the visual and applied the effect 
            foreach (DUCE.ChannelSet channelSet in channels)
            { 
                visual.SetFlags(channelSet.Channel, false, VisualProxyFlags.IsBitmapEffectDirty);
            }
            BitmapEffectDrawing.ScheduleForUpdates = true;
        } 

        #region Private Fields 
 
        BitmapEffectDrawing _bitmapEffectDrawing;
        RenderTargetBitmap _renderBitmap; 
        #endregion

    }
} 

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

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