CroppedBitmap.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Imaging / CroppedBitmap.cs / 1305600 / 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();
 
            IsValidForFinalizeCreation(/* throwIfInvalid = */ true);
            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)); 
                    } 

                    // 
                    // This is just a link in a BitmapSource chain. The memory is being used by
                    // the BitmapSource at the end of the chain, so no memory pressure needs
                    // to be added here.
                    // 
                    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;
                RegisterDownloadEventSource(_source); 
                _syncObject = (newSource != null) ? newSource.SyncObject : _bitmapInit;
            }
        }
 
        internal override bool IsValidForFinalizeCreation(bool throwIfInvalid)
        { 
            if (Source == null) 
            {
                if (throwIfInvalid) 
                {
                    throw new InvalidOperationException(SR.Get(SRID.Image_NoArgument, "Source"));
                }
                return false; 
            }
 
            return true; 
        }
 
        /// 
        ///     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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