Renderer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Renderer.cs / 1305600 / Renderer.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//      Though called "Renderer", this is used only for the 'rendering 
//      to a BitmapImage' case, and not when rendering to an HwndTarget.
// 
//-----------------------------------------------------------------------------

using System;
using System.Windows; 
using System.Collections.Generic;
using System.Windows.Threading; 
 
using System.Diagnostics;
 
using MS.Internal;
using System.Windows.Media;
using System.Windows.Media.Composition;
 
using MS.Win32;
using System.Security; 
using System.Security.Permissions; 

namespace System.Windows.Media 
{
    static internal class Renderer
    {
 
        /// 
        /// Critical - unmanaged pointer arguments, access critical resources, calls unmanaged code 
        ///  
        [SecurityCritical]
        static public void Render( 
            IntPtr pRenderTarget,
            DUCE.Channel channel,
            Visual visual,
            int width, 
            int height,
            double dpiX, 
            double dpiY) 
        {
            Render(pRenderTarget, channel, visual, width, height, dpiX, dpiY, Matrix.Identity, Rect.Empty); 
        }

        /// 
        /// If fRenderForBitmapEffect is true, the method calls special methods on visual 
        /// to render it specifically for an effect to be applied to it. It excludes
        /// properties such as transform, clip, offset and guidelines. 
        ///  
        /// 
        /// Critical - unmanaged pointer arguments, access critical resources, calls unmanaged code 
        /// 
        [SecurityCritical]
        static internal void Render(
            IntPtr pRenderTarget, 
            DUCE.Channel channel,
            Visual visual, 
            int width, 
            int height,
            double dpiX, 
            double dpiY,
            Matrix worldTransform,
            Rect windowClip
            ) 
        {
            DUCE.Resource target = 
                new DUCE.Resource(); 
            DUCE.Resource root =
                new DUCE.Resource(); 

            DUCE.ResourceHandle targetHandle = DUCE.ResourceHandle.Null;
            DUCE.ResourceHandle rootHandle = DUCE.ResourceHandle.Null;
 
            Matrix deviceTransform = new Matrix(
                dpiX * (1.0 / 96.0),    0, 
                0,                      dpiY * (1.0 / 96.0), 
                0,                      0);
 
            deviceTransform = worldTransform * deviceTransform;
            MatrixTransform mtDeviceTransform = new MatrixTransform(deviceTransform);

            DUCE.ResourceHandle deviceTransformHandle = 
                ((DUCE.IResource)mtDeviceTransform).AddRefOnChannel(channel);
 
 
            try
            { 
                // -----------------------------------------------------------
                //   Create the composition target and root visual resources.

                target.CreateOrAddRefOnChannel(target, channel, DUCE.ResourceType.TYPE_GENERICRENDERTARGET); 
                targetHandle = target.Handle;
 
                DUCE.CompositionTarget.PrintInitialize( 
                    targetHandle,
                    pRenderTarget, 
                    width,
                    height,
                    channel);
 
                root.CreateOrAddRefOnChannel(root, channel, DUCE.ResourceType.TYPE_VISUAL);
                rootHandle = root.Handle; 
 
                DUCE.CompositionNode.SetTransform(
                    rootHandle, 
                    deviceTransformHandle,
                    channel);

                DUCE.CompositionTarget.SetRoot( 
                    targetHandle,
                    rootHandle, 
                    channel); 

                channel.CloseBatch(); 
                channel.Commit();


                // ----------------------------------------------------------- 
                //   Render the freshly created target.
 
                RenderContext renderContext = new RenderContext(); 

                renderContext.Initialize(channel, rootHandle); 

                visual.Precompute();

                visual.Render(renderContext, 0); 

                // ------------------------------------------------------------ 
                //   Flush the channel and present the composition target. 

                channel.CloseBatch(); 
                channel.Commit();
                channel.Present();

                MediaContext mediaContext = MediaContext.CurrentMediaContext; 
                mediaContext.NotifySyncChannelMessage(channel);
 
            } 
            finally
            { 
                // -----------------------------------------------------------
                //   Clean up and release the root visual.

                if (!rootHandle.IsNull) 
                {
                    DUCE.CompositionNode.RemoveAllChildren( 
                        rootHandle, 
                        channel);
 
                    ((DUCE.IResource)visual).ReleaseOnChannel(channel);

                    root.ReleaseOnChannel(channel);
                } 

 
                // ------------------------------------------------------------ 
                //   Release the world transform.
 
                if (!deviceTransformHandle.IsNull)
                {
                    ((DUCE.IResource)mtDeviceTransform).ReleaseOnChannel(channel);
                } 

 
                // ------------------------------------------------------------ 
                //   Clean up and release the composition target.
 
                if (!targetHandle.IsNull)
                {
                    DUCE.CompositionTarget.SetRoot(
                        targetHandle, 
                        DUCE.ResourceHandle.Null,
                        channel); 
 
                    target.ReleaseOnChannel(channel);
                } 

                // -----------------------------------------------------------
                //   Flush the channel and present the composition target.
 
                channel.CloseBatch();
                channel.Commit(); 
                channel.Present(); 

                MediaContext mediaContext = MediaContext.CurrentMediaContext; 
                mediaContext.NotifySyncChannelMessage(channel);
            }
        }
    } 
}
 

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

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