RenderTargetBitmap.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Imaging / RenderTargetBitmap.cs / 1 / RenderTargetBitmap.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation.  All Rights Reserved.
//
//  File: BitmapImage.cs 
//
//----------------------------------------------------------------------------- 
 

using System; 
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel; 
using System.ComponentModel.Design.Serialization;
using System.Reflection; 
using MS.Internal; 
using MS.Win32.PresentationCore;
using System.Security; 
using System.Security.Permissions;
using System.Diagnostics;
using System.Windows.Media;
using System.Globalization; 
using System.Runtime.InteropServices;
using System.Windows.Media.Animation; 
using System.Windows.Media.Composition; 

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

namespace System.Windows.Media.Imaging
{ 
    #region RenderTargetBitmap
    ///  
    /// RenderTargetBitmap provides caching functionality for a BitmapSource. 
    /// 
    public sealed class RenderTargetBitmap : System.Windows.Media.Imaging.BitmapSource 
    {
        /// 
        /// RenderTargetBitmap - used in conjuction with BitmapVisualManager
        ///  
        /// The width of the Bitmap
        /// The height of the Bitmap 
        /// Horizontal DPI of the Bitmap 
        /// Vertical DPI of the Bitmap
        /// Format of the Bitmap. 
        /// 
        /// Critical - access critical resources
        /// PublicOK - All inputs verified
        ///  
        [SecurityCritical]
        public RenderTargetBitmap( 
            int pixelWidth, 
            int pixelHeight,
            double dpiX, 
            double dpiY,
            PixelFormat pixelFormat
            ) : base(true)
        { 
            if (pixelFormat.Format == PixelFormatEnum.Default)
            { 
                pixelFormat = PixelFormats.Pbgra32; 
            }
            else if (pixelFormat.Format != PixelFormatEnum.Pbgra32) 
            {
                throw new System.ArgumentException(
                        SR.Get(SRID.Effect_PixelFormat, pixelFormat),
                        "pixelFormat" 
                        );
            } 
 
            if (pixelWidth <= 0)
            { 
                throw new ArgumentOutOfRangeException("pixelWidth", SR.Get(SRID.ParameterMustBeGreaterThanZero));
            }

            if (pixelHeight <= 0) 
            {
                throw new ArgumentOutOfRangeException("pixelHeight", SR.Get(SRID.ParameterMustBeGreaterThanZero)); 
            } 

            if (dpiX < DoubleUtil.DBL_EPSILON) 
            {
                dpiX = 96.0;
            }
 
            if (dpiY < DoubleUtil.DBL_EPSILON)
            { 
                dpiY = 96.0; 
            }
 
            _bitmapInit.BeginInit();
            _pixelWidth = pixelWidth;
            _pixelHeight = pixelHeight;
            _dpiX = dpiX; 
            _dpiY = dpiY;
            _format = pixelFormat; 
            _bitmapInit.EndInit(); 
            FinalizeCreation();
        } 

        /// 
        /// Internal ctor
        ///  
        internal RenderTargetBitmap() :
            base(true) 
        { 
        }
 
        /// 
        /// Implementation of Freezable.CreateInstanceCore.
        /// 
        /// The new Freezable. 
        protected override Freezable CreateInstanceCore()
        { 
            return new RenderTargetBitmap(); 
        }
 
        /// 
        /// Common Copy method used to implement CloneCore(), CloneCurrentValueCore(),
        /// GetAsFrozenCore(), and GetCurrentValueAsFrozenCore()
        ///  
        /// 
        /// Critical - access unmanaged resource 
        /// TreatAsSafe - making a clone which is safe 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        private void CopyCommon(RenderTargetBitmap sourceBitmap)
        {
            _bitmapInit.BeginInit();
            _pixelWidth = sourceBitmap._pixelWidth; 
            _pixelHeight = sourceBitmap._pixelHeight;
            _dpiX = sourceBitmap._dpiX; 
            _dpiY = sourceBitmap._dpiY; 
            _format = sourceBitmap._format;
 
            //
            // In order to make a deep clone we need to
            // create a new bitmap with the contents of the
            // existing bitmap and then create a render target 
            // from the new bitmap.
            // 
            using (FactoryMaker myFactory = new FactoryMaker()) 
            {
                BitmapSourceSafeMILHandle newBitmapHandle = null; 
                IntPtr pIMILBitmap = IntPtr.Zero;
                SafeMILHandle milBitmapHandle = null;

                // Create an IWICBitmap 
                HRESULT.Check(UnsafeNativeMethods.WICImagingFactory.CreateBitmapFromSource(
                        myFactory.ImagingFactoryPtr, 
                        WicSourceHandle, 
                        WICBitmapCreateCacheOptions.WICBitmapCacheOnLoad,
                        out newBitmapHandle)); 

                lock (_syncObject)
                {
                    WicSourceHandle = newBitmapHandle; 
                }
 
                Guid guidMILBs = MILGuidData.IID_IMILBitmapSource; 

                // QI for IMILBitmapSource 
                HRESULT.Check(UnsafeNativeMethods.MILUnknown.QueryInterface(
                    newBitmapHandle,
                    ref guidMILBs,
                    out pIMILBitmap)); 

                // Creating this will automatically do the garbage collection (and release) 
                milBitmapHandle = new SafeMILHandle(pIMILBitmap, 0); 

                // Now create a Render target from that Bitmap 
                HRESULT.Check(UnsafeNativeMethods.MILFactory2.CreateBitmapRenderTargetForBitmap(
                    myFactory.FactoryPtr,
                    pIMILBitmap,
                    out _renderTargetBitmap)); 
            }
 
            _bitmapInit.EndInit(); 
        }
 
        /// 
        /// Implementation of Freezable.CloneCore.
        /// 
        protected override void CloneCore(Freezable sourceFreezable) 
        {
            RenderTargetBitmap sourceBitmap = (RenderTargetBitmap)sourceFreezable; 
 
            base.CloneCore(sourceFreezable);
 
            CopyCommon(sourceBitmap);
        }

        ///  
        /// Implementation of Freezable.CloneCurrentValueCore.
        ///  
        protected override void CloneCurrentValueCore(Freezable sourceFreezable) 
        {
            RenderTargetBitmap sourceBitmap = (RenderTargetBitmap)sourceFreezable; 

            base.CloneCurrentValueCore(sourceFreezable);

            CopyCommon(sourceBitmap); 
        }
 
        ///  
        /// Implementation of Freezable.GetAsFrozenCore.
        ///  
        protected override void GetAsFrozenCore(Freezable sourceFreezable)
        {
            RenderTargetBitmap sourceBitmap = (RenderTargetBitmap)sourceFreezable;
 
            base.GetAsFrozenCore(sourceFreezable);
 
            CopyCommon(sourceBitmap); 
        }
 
        /// 
        /// Implementation of Freezable.GetCurrentValueAsFrozenCore.
        /// 
        protected override void GetCurrentValueAsFrozenCore(Freezable sourceFreezable) 
        {
            RenderTargetBitmap sourceBitmap = (RenderTargetBitmap)sourceFreezable; 
 
            base.GetCurrentValueAsFrozenCore(sourceFreezable);
 
            CopyCommon(sourceBitmap);
        }

 
        /// 
        /// Renders the specified Visual tree to the BitmapRenderTarget. 
        ///  
        public void Render(Visual visual)
        { 
            BitmapVisualManager bmv = new BitmapVisualManager(this);
            bmv.Render(visual); // Render indirectly calls RenderTargetContentsChanged();
        }
 
        /// 
        /// Renders the specified Visual tree to the BitmapRenderTarget 
        /// This renders the visual without transform, clip, offset and 
        /// guidelines applied to it.
        ///  
        internal void RenderForBitmapEffect(Visual visual, Matrix worldTransform, Rect windowClip)
        {
            // first clear the render target
            Clear(); 

            BitmapVisualManager bmv = new BitmapVisualManager(this); 
            bmv.Render(visual, worldTransform, windowClip, true); // Render indirectly calls RenderTargetContentsChanged(); 
        }
 
        /// 
        /// Clears the render target and sets every pixel to black transparent
        /// 
        ///  
        /// Critical - access unmanaged resource
        /// PublicOk - Clear is safe (no inputs) 
        ///  
        [SecurityCritical]
        public void Clear() 
        {
            HRESULT.Check(MILRenderTargetBitmap.Clear(_renderTargetBitmap));
            RenderTargetContentsChanged();
        } 

        /// 
        /// Get the MIL RenderTarget 
        ///
        ///  
        /// Critical - returns unmanaged resource
        /// 
        internal SafeMILHandle MILRenderTarget
        { 
            [SecurityCritical]
            get 
            { 
                return _renderTargetBitmap;
            } 
        }

        ///
        /// Notify that the contents of the render target have changed 
        ///
        ///  
        /// Critical - access critical resource _convertedDUCEMILPtr 
        /// TreatAsSafe - Critical data is used internally and not exposed
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        internal void RenderTargetContentsChanged()
        {
            // If the render target has changed, we need to update the UCE resource.  We ensure 
            // this happens by throwing away our reference to the previous DUCE bitmap source
            // and forcing the creation of a new one. 
            _isSourceCached = false; 

            if (_convertedDUCEMILPtr != null) 
            {
                _convertedDUCEMILPtr.Close();
                _convertedDUCEMILPtr = null;
            } 

            // Register for update in the next render pass 
            RegisterForAsyncUpdateResource(); 
            FireChanged();
        } 

        ///
        /// Create the unmanaged resources
        /// 
        /// 
        /// Critical - creates critical resource 
        ///  
        [SecurityCritical]
        internal override void FinalizeCreation() 
        {
            try
            {
                using (FactoryMaker myFactory = new FactoryMaker()) 
                {
                    SafeMILHandle renderTargetBitmap = null; 
                    HRESULT.Check(UnsafeNativeMethods.MILFactory2.CreateBitmapRenderTarget( 
                        myFactory.FactoryPtr,
                        (uint)_pixelWidth, 
                        (uint)_pixelHeight,
                        _format.Format,
                        (float)_dpiX,
                        (float)_dpiY, 
                        MILRTInitializationFlags.MIL_RT_INITIALIZE_DEFAULT,
                        out renderTargetBitmap)); 
 
                    Debug.Assert(renderTargetBitmap != null && !renderTargetBitmap.IsInvalid);
 
                    BitmapSourceSafeMILHandle bitmapSource = null;
                    HRESULT.Check(MILRenderTargetBitmap.GetBitmap(
                        renderTargetBitmap,
                        out bitmapSource)); 
                    Debug.Assert(bitmapSource != null && !bitmapSource.IsInvalid);
 
                    lock (_syncObject) 
                    {
                        _renderTargetBitmap = renderTargetBitmap; 
                        WicSourceHandle = bitmapSource;

                        // For the purpose of rendering a RenderTargetBitmap, we always treat it as if it's
                        // not cached.  This is to ensure we never render and write to the same bitmap source 
                        // by the UCE thread and managed thread.
                        _isSourceCached = false; 
                    } 
                }
 
                CreationCompleted = true;
                UpdateCachedSettings();
            }
            catch 
            {
                _bitmapInit.Reset(); 
                throw; 
            }
 
        }

        /// 
        /// Critical - unmanaged resource - not safe for handing out 
        /// 
        [SecurityCritical] 
        private SafeMILHandle /* IMILRenderTargetBitmap */ _renderTargetBitmap; 

    } 
    #endregion // RenderTargetBitmap
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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