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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