CroppedBitmap.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 / CroppedBitmap.cs / 1 / CroppedBitmap.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation.  All Rights Reserved.
//
//  File: CroppedBitmap.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 CroppedBitmap
    ///  
    /// CroppedBitmap provides caching functionality for a BitmapSource. 
    /// 
    public sealed partial class CroppedBitmap : Imaging.BitmapSource, ISupportInitialize 
    {
        /// 
        /// Constructor
        ///  
        public CroppedBitmap() : base(true)
        { 
        } 

        ///  
        /// Construct a CroppedBitmap
        /// 
        /// BitmapSource to apply to the crop to
        /// Source rect of the bitmap to use 
        public CroppedBitmap(BitmapSource source, Int32Rect sourceRect)
            : base(true) // Use base class virtuals 
        { 
            if (source == null)
            { 
                throw new ArgumentNullException("source");
            }

            _bitmapInit.BeginInit(); 

            Source = source; 
            SourceRect = sourceRect; 

            _bitmapInit.EndInit(); 
            FinalizeCreation();
        }

        // ISupportInitialize 

        ///  
        /// Prepare the bitmap to accept initialize paramters. 
        /// 
        public void BeginInit() 
        {
            WritePreamble();
            _bitmapInit.BeginInit();
        } 

        ///  
        /// Prepare the bitmap to accept initialize paramters. 
        /// 
        ///  
        /// Critical - access critical resources
        /// PublicOK - All inputs verified
        /// 
        [SecurityCritical ] 
        public void EndInit()
        { 
            WritePreamble(); 
            _bitmapInit.EndInit();
 
            if (Source == null)
            {
                throw new InvalidOperationException(SR.Get(SRID.Image_NoArgument, "Source"));
            } 

            FinalizeCreation(); 
        } 

        private void ClonePrequel(CroppedBitmap otherCroppedBitmap) 
        {
            BeginInit();
        }
 
        private void ClonePostscript(CroppedBitmap otherCroppedBitmap)
        { 
            EndInit(); 
        }
 
        ///
        /// Create the unmanaged resources
        ///
        ///  
        /// Critical - access critical resource
        ///  
        [SecurityCritical] 
        internal override void FinalizeCreation()
        { 
            _bitmapInit.EnsureInitializedComplete();
            BitmapSourceSafeMILHandle wicClipper = null;

            Int32Rect rect = SourceRect; 
            BitmapSource source = Source;
 
            if (rect.IsEmpty) 
            {
                rect.Width = source.PixelWidth; 
                rect.Height = source.PixelHeight;
            }

            using (FactoryMaker factoryMaker = new FactoryMaker()) 
            {
                try 
                { 
                    IntPtr wicFactory = factoryMaker.ImagingFactoryPtr;
 
                    HRESULT.Check(UnsafeNativeMethods.WICImagingFactory.CreateBitmapClipper(
                            wicFactory,
                            out wicClipper));
 
                    lock (_syncObject)
                    { 
                        HRESULT.Check(UnsafeNativeMethods.WICBitmapClipper.Initialize( 
                                wicClipper,
                                source.WicSourceHandle, 
                                ref rect));
                    }

                    WicSourceHandle = wicClipper; 
                    _isSourceCached = source.IsSourceCached;
                    wicClipper = null; 
                } 
                catch
                { 
                    _bitmapInit.Reset();
                    throw;
                }
                finally 
                {
                    if (wicClipper != null) 
                        wicClipper.Close(); 
                }
            } 

            CreationCompleted = true;
            UpdateCachedSettings();
        } 

        ///  
        ///     Notification on source changing. 
        /// 
        private void SourcePropertyChangedHook(DependencyPropertyChangedEventArgs e) 
        {
            if (!e.IsASubPropertyChange)
            {
                BitmapSource newSource = e.NewValue as BitmapSource; 
                _source = newSource;
                _syncObject = (newSource != null) ? newSource.SyncObject : _bitmapInit; 
            } 
        }
 
        /// 
        ///     Notification on source rect changing.
        /// 
        private void SourceRectPropertyChangedHook(DependencyPropertyChangedEventArgs e) 
        {
            if (!e.IsASubPropertyChange) 
            { 
                _sourceRect = (Int32Rect)e.NewValue;
            } 
        }

        /// 
        ///     Coerce Source 
        /// 
        private static object CoerceSource(DependencyObject d, object value) 
        { 
            CroppedBitmap bitmap = (CroppedBitmap)d;
            if (!bitmap._bitmapInit.IsInInit) 
            {
                return bitmap._source;
            }
            else 
            {
                return value; 
            } 
        }
 
        /// 
        ///     Coerce SourceRect
        /// 
        private static object CoerceSourceRect(DependencyObject d, object value) 
        {
            CroppedBitmap bitmap = (CroppedBitmap)d; 
            if (!bitmap._bitmapInit.IsInInit) 
            {
                return bitmap._sourceRect; 
            }
            else
            {
                return value; 
            }
        } 
 
        #region Data members
 
        private BitmapSource _source;

        private Int32Rect _sourceRect;
 
        #endregion
 
    } 

    #endregion // CroppedBitmap 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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CroppedBitmap.cs source code in C# .NET

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