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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