Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Imaging / BitmapFrameDecode.cs / 1 / BitmapFrameDecode.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation // // File: BitmapFrameDecode.cs // //----------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.ObjectModel; using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using MS.Internal; using MS.Internal.PresentationCore; using System.Diagnostics; using System.Windows.Media; using System.Globalization; using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; using System.Windows.Media.Animation; using System.Windows.Media.Composition; using System.Windows.Media.Imaging; using MS.Win32.PresentationCore; #pragma warning disable 1634, 1691 // Allow suppression of certain presharp messages namespace System.Windows.Media.Imaging { #region BitmapFrameDecode ////// BitmapFrameDecode abstract class /// internal sealed class BitmapFrameDecode : BitmapFrame { #region Constructors ////// Internal constructor -- Creates new frame using specified decoder /// internal BitmapFrameDecode( int frameNumber, BitmapSourceSafeMILHandle sourceHandle, BitmapCreateOptions createOptions, BitmapCacheOption cacheOption, BitmapDecoder decoder ) : base(true) { _bitmapInit.BeginInit(); _frameNumber = frameNumber; _isThumbnailCached = false; _isMetadataCached = false; _frameSource = sourceHandle; Debug.Assert(decoder != null); _decoder = decoder; _syncObject = decoder.SyncObject; _createOptions = createOptions; _cacheOption = cacheOption; _bitmapInit.EndInit(); if ((createOptions & BitmapCreateOptions.DelayCreation) != 0) { DelayCreation = true; } else { FinalizeCreation(); } } ////// Internal constructor -- Creates frame from another frame /// ////// SecurityCritical: Accesses unmanaged resources (_wicSource) /// SecurityTreatAsSafe: Inputs are verified and _wicSource and the get is Critical /// [SecurityCritical, SecurityTreatAsSafe] internal BitmapFrameDecode( int frameNumber, BitmapCreateOptions createOptions, BitmapCacheOption cacheOption, BitmapFrameDecode frameDecode ) : base(true) { _bitmapInit.BeginInit(); _frameNumber = frameNumber; WicSourceHandle = frameDecode.WicSourceHandle; IsSourceCached = frameDecode.IsSourceCached; CreationCompleted = frameDecode.CreationCompleted; _frameSource = frameDecode._frameSource; _decoder = frameDecode.Decoder; _syncObject = _decoder.SyncObject; _createOptions = createOptions; _cacheOption = cacheOption; _thumbnail = frameDecode._thumbnail; _isThumbnailCached = frameDecode._isThumbnailCached; _metadata = frameDecode._metadata; _isMetadataCached = frameDecode._isMetadataCached; _readOnlycolorContexts = frameDecode._readOnlycolorContexts; _isColorContextCached = frameDecode._isColorContextCached; _bitmapInit.EndInit(); if ((createOptions & BitmapCreateOptions.DelayCreation) != 0) { DelayCreation = true; } else if (!CreationCompleted) { FinalizeCreation(); } else { UpdateCachedSettings(); } } ////// Internal constructor -- Creates frame thats being downloaded /// ////// SecurityCritical: Accesses unmanaged resources (_wicSource) /// SecurityTreatAsSafe: Inputs are verified and _wicSource and the get is Critical /// [SecurityCritical, SecurityTreatAsSafe] internal BitmapFrameDecode( int frameNumber, BitmapCreateOptions createOptions, BitmapCacheOption cacheOption, LateBoundBitmapDecoder decoder ) : base(true) { _bitmapInit.BeginInit(); _frameNumber = frameNumber; byte[] pixels = new byte[4]; BitmapSource source = BitmapSource.Create( 1, 1, 96, 96, PixelFormats.Pbgra32, null, pixels, 4 ); WicSourceHandle = source.WicSourceHandle; Debug.Assert(decoder != null); _decoder = decoder; _createOptions = createOptions; _cacheOption = cacheOption; _decoder.DownloadCompleted += new EventHandler(OnDownloadCompleted); _decoder.DownloadProgress += new EventHandler(OnDownloadProgress); _decoder.DownloadFailed += new EventHandler (OnDownloadFailed); _bitmapInit.EndInit(); } /// /// Do not allow construction /// private BitmapFrameDecode() : base(true) { } #endregion #region IUriContext ////// Provides the base uri of the current context. /// public override Uri BaseUri { get { ReadPreamble(); return _decoder._baseUri; } set { WritePreamble(); // Nothing to do here. } } #endregion #region Public Properties ////// Accesses the Thumbnail property for this BitmapFrameDecode /// public override BitmapSource Thumbnail { get { ReadPreamble(); EnsureThumbnail(); return _thumbnail; } } ////// Accesses the Metadata property for this BitmapFrameDecode /// public override ImageMetadata Metadata { get { ReadPreamble(); return InternalMetadata; } } ////// Accesses the Decoder property for this BitmapFrameDecode /// public override BitmapDecoder Decoder { get { ReadPreamble(); return _decoder; } } ////// If there is an embedded color profile, return it. /// Otherwise, return null. This method does NOT create a /// color profile for bitmaps that don't already have one. /// ////// Provides access to this encoders color profile /// /// ////// Critical - Access unmanaged code, codecs /// TreatAsSafe - Getting Color Context data is OK /// public override ReadOnlyCollectionColorContexts { [SecurityCritical, SecurityTreatAsSafe] get { ReadPreamble(); if (!_isColorContextCached && !IsDownloading) { EnsureSource(); // Check if there is colorContext or not lock (_syncObject) { unsafe { uint uiCount = 0; int hr = UnsafeNativeMethods.WICBitmapFrameDecode.GetColorContexts( _frameSource, 0, IntPtr.Zero, out uiCount ); if (hr != (int)WinCodecErrors.WINCODEC_ERR_UNSUPPORTEDOPERATION) { HRESULT.Check(hr); } if (uiCount > 0) { List colorContextsList = new List ((int)uiCount); IntPtr *pcolorContextslocal = stackalloc IntPtr[(int)uiCount]; for (int i = 0; i < uiCount; i++) pcolorContextslocal[i] = IntPtr.Zero; SafeMILHandle[] colorContextHandles = new SafeMILHandle[uiCount]; using (FactoryMaker factoryMaker = new FactoryMaker()) { try { for (int i = 0; i < uiCount; i++) { Guid wicColorContextGuid = MILGuidData.IID_IWICColorContext; HRESULT.Check(UnsafeNativeMethods.WICCodec.CreateColorContext(factoryMaker.ImagingFactoryPtr, out colorContextHandles[i])); HRESULT.Check(UnsafeNativeMethods.MILUnknown.QueryInterface(colorContextHandles[i], ref wicColorContextGuid, out pcolorContextslocal[i])); } } finally { for (int i = 0; i < uiCount; i++) { #pragma warning suppress 6031 UnsafeNativeMethods.MILUnknown.Release(pcolorContextslocal[i]); } } HRESULT.Check(UnsafeNativeMethods.WICBitmapFrameDecode.GetColorContexts( _frameSource, uiCount, (IntPtr)pcolorContextslocal, out uiCount )); } for (uint i = 0; i < uiCount; i++) { colorContextsList.Add(new ColorContext(colorContextHandles[i])); } _readOnlycolorContexts = new ReadOnlyCollection (colorContextsList); } } _isColorContextCached = true; } } return _readOnlycolorContexts; } } /// /// Returns if the BitmapFrame is downloading content /// public override bool IsDownloading { get { ReadPreamble(); return Decoder.IsDownloading; } } #endregion #region Public Methods ////// Create an in-place bitmap metadata writer. /// public override InPlaceBitmapMetadataWriter CreateInPlaceBitmapMetadataWriter() { ReadPreamble(); if (_decoder != null) { _decoder.CheckOriginalWritable(); } // Demand Site Of Origin on the URI before usage of metadata. CheckIfSiteOfOrigin(); EnsureSource(); return InPlaceBitmapMetadataWriter.CreateFromFrameDecode(_frameSource, _syncObject); } #endregion #region ToString ////// Can serialze "this" to a string /// internal override bool CanSerializeToString() { ReadPreamble(); return _decoder.CanConvertToString(); } ////// Creates a string representation of this object based on the format string /// and IFormatProvider passed in. /// If the provider is null, the CurrentCulture is used. /// See the documentation for IFormattable for more information. /// ////// A string representation of this object. /// internal override string ConvertToString(string format, IFormatProvider provider) { ReadPreamble(); if (_decoder != null) { return _decoder.ToString(); } return base.ConvertToString(format, provider); } #endregion #region Freezable ////// Implementation of ///Freezable.CreateInstanceCore . ///The new Freezable. protected override Freezable CreateInstanceCore() { return new BitmapFrameDecode(); } ////// Copy the fields not covered by DPs. This is used by /// CloneCore(), CloneCurrentValueCore(), GetAsFrozenCore() and /// GetCurrentValueAsFrozenCore(). /// ////// Critical - access critical resources (_metadata) /// TreatAsSafe - All inputs verified /// [SecurityCritical, SecurityTreatAsSafe] private void CopyCommon(BitmapFrameDecode sourceBitmapFrameDecode) { _bitmapInit.BeginInit(); _frameNumber = sourceBitmapFrameDecode._frameNumber; _isThumbnailCached = sourceBitmapFrameDecode._isThumbnailCached; _isMetadataCached = sourceBitmapFrameDecode._isMetadataCached; _isColorContextCached = sourceBitmapFrameDecode._isColorContextCached; _frameSource = sourceBitmapFrameDecode._frameSource; _thumbnail = sourceBitmapFrameDecode._thumbnail; _metadata = sourceBitmapFrameDecode.InternalMetadata; _readOnlycolorContexts = sourceBitmapFrameDecode._readOnlycolorContexts; _decoder = sourceBitmapFrameDecode._decoder; _syncObject = _decoder.SyncObject; _createOptions = sourceBitmapFrameDecode._createOptions; _cacheOption = sourceBitmapFrameDecode._cacheOption; _bitmapInit.EndInit(); } ////// Implementation of protected override void CloneCore(Freezable sourceFreezable) { BitmapFrameDecode sourceBitmapFrameDecode = (BitmapFrameDecode)sourceFreezable; base.CloneCore(sourceFreezable); CopyCommon(sourceBitmapFrameDecode); } ///Freezable.CloneCore . ////// Implementation of protected override void CloneCurrentValueCore(Freezable sourceFreezable) { BitmapFrameDecode sourceBitmapFrameDecode = (BitmapFrameDecode)sourceFreezable; base.CloneCurrentValueCore(sourceFreezable); CopyCommon(sourceBitmapFrameDecode); } ///Freezable.CloneCurrentValueCore . ////// Implementation of protected override void GetAsFrozenCore(Freezable sourceFreezable) { BitmapFrameDecode sourceBitmapFrameDecode = (BitmapFrameDecode)sourceFreezable; base.GetAsFrozenCore(sourceFreezable); CopyCommon(sourceBitmapFrameDecode); } ///Freezable.GetAsFrozenCore . ////// Implementation of protected override void GetCurrentValueAsFrozenCore(Freezable sourceFreezable) { BitmapFrameDecode sourceBitmapFrameDecode = (BitmapFrameDecode)sourceFreezable; base.GetCurrentValueAsFrozenCore(sourceFreezable); CopyCommon(sourceBitmapFrameDecode); } #endregion #region Internal Properties / Methods ///Freezable.GetCurrentValueAsFrozenCore . ////// Updates the internal decoder -- usually happens with a LateBoundBitmapDecoder /// ////// Critical - access critical resources /// TreatAsSafe - All inputs verified /// [SecurityCritical, SecurityTreatAsSafe] internal void UpdateDecoder(BitmapDecoder decoder) { Debug.Assert(_decoder != null); _decoder = decoder; _syncObject = decoder.SyncObject; WicSourceHandle = null; _needsUpdate = true; FinalizeCreation(); // Trigger a update of the UCE resource RegisterForAsyncUpdateResource(); } ////// Create the unmanaged resources /// ////// Critical - access critical resources /// TreatAsSafe - All inputs verified /// [SecurityCritical, SecurityTreatAsSafe] internal override void FinalizeCreation() { EnsureSource(); // Set the WicSourceHandle and Update the cached settings so that we // can query the source for information such as the palette which we need // to determine if we need to format convert or not. WicSourceHandle = _frameSource; UpdateCachedSettings(); lock (_syncObject) { WicSourceHandle = CreateCachedBitmap(this, _frameSource, _createOptions, _cacheOption, Palette); } IsSourceCached = (_cacheOption != BitmapCacheOption.None); CreationCompleted = true; UpdateCachedSettings(); EnsureThumbnail(); } #endregion #region Private Methods /// Fired when the decoder download has completed private void OnDownloadCompleted(object sender, EventArgs e) { FireChanged(); _downloadEvent.InvokeEvents(this, null); } /// Called when download progress is made private void OnDownloadProgress(object sender, DownloadProgressEventArgs e) { _progressEvent.InvokeEvents(this, e); } /// Called when download fails private void OnDownloadFailed(object sender, ExceptionEventArgs e) { _failedEvent.InvokeEvents(this, e); } ////// Ensure that the thumbnail is created/cached /// ////// Critical - Access unmanaged code, codecs /// TreatAsSafe - Getting thumbnail data is OK /// [SecurityCritical, SecurityTreatAsSafe] private void EnsureThumbnail() { if (_isThumbnailCached || IsDownloading) { return; } else { EnsureSource(); IntPtr /* IWICBitmapSource */ thumbnail = IntPtr.Zero; lock (_syncObject) { // Check if there is embedded thumbnail or not int hr = UnsafeNativeMethods.WICBitmapFrameDecode.GetThumbnail( _frameSource, out thumbnail ); if (hr != (int)WinCodecErrors.WINCODEC_ERR_CODECNOTHUMBNAIL) { HRESULT.Check(hr); } } _isThumbnailCached = true; if (thumbnail != IntPtr.Zero) { BitmapSourceSafeMILHandle thumbHandle = new BitmapSourceSafeMILHandle(thumbnail); SafeMILHandle unmanagedPalette = BitmapPalette.CreateInternalPalette(); BitmapPalette palette = null; int hr = UnsafeNativeMethods.WICBitmapSource.CopyPalette( thumbHandle, unmanagedPalette ); if (hr == HRESULT.S_OK) { palette = new BitmapPalette(unmanagedPalette); } _thumbnail = new UnmanagedBitmapWrapper( CreateCachedBitmap( null, thumbHandle, BitmapCreateOptions.PreservePixelFormat, _cacheOption, palette )); _thumbnail.Freeze(); } } } ////// Returns cached metadata and creates BitmapMetadata if it does not exist. /// This code will demand site of origin permissions. /// ////// Critical - Access unmanaged code /// TreatAsSafe - demands site of origin permissions /// internal override BitmapMetadata InternalMetadata { [SecurityCritical, SecurityTreatAsSafe] get { // Demand Site Of Origin on the URI before usage of metadata. CheckIfSiteOfOrigin(); if (!_isMetadataCached && !IsDownloading) { EnsureSource(); IntPtr /* IWICMetadataQueryReader */ metadata = IntPtr.Zero; lock (_syncObject) { // Check if there is embedded metadata or not int hr = UnsafeNativeMethods.WICBitmapFrameDecode.GetMetadataQueryReader( _frameSource, out metadata ); if (hr != (int)WinCodecErrors.WINCODEC_ERR_UNSUPPORTEDOPERATION) { HRESULT.Check(hr); } } if (metadata != IntPtr.Zero) { SafeMILHandle metadataHandle = new SafeMILHandle(metadata, 0); _metadata = new BitmapMetadata(metadataHandle, true, _decoder != null ? _decoder.IsMetadataFixedSize : false, _syncObject); _metadata.Freeze(); } _isMetadataCached = true; } return _metadata; } set { throw new System.NotImplementedException(); } } ////// Ensure that a BitmapSource is created /// ////// Critical - Access unmanaged code, codecs /// TreatAsSafe - Getting frame data is OK /// [SecurityCritical, SecurityTreatAsSafe] private void EnsureSource() { if (_frameSource == null) { if (_decoder == null) { HRESULT.Check((int)WinCodecErrors.WINCODEC_ERR_NOTINITIALIZED); } // // Its possible that the frame was originally created with a network URI // and DelayCreation was enabled. In this case, the decoder may not yet // exist even though the download is complete. The code below creates a // decoder if one does not exist. // if (_decoder.InternalDecoder == null) { Debug.Assert(_decoder is LateBoundBitmapDecoder); Debug.Assert(IsDownloading == false); _decoder = ((LateBoundBitmapDecoder)_decoder).Decoder; _syncObject = _decoder.SyncObject; Debug.Assert(_decoder.InternalDecoder != null); } IntPtr frameDecode = IntPtr.Zero; Debug.Assert(_syncObject != null); lock (_syncObject) { HRESULT.Check(UnsafeNativeMethods.WICBitmapDecoder.GetFrame( _decoder.InternalDecoder, (uint)_frameNumber, out frameDecode )); _frameSource = new BitmapSourceSafeMILHandle(frameDecode); } } } #endregion #region Internal Abstract /// Need to implement this to derive from the "sealed" object internal override void SealObject() { throw new NotImplementedException(); } #endregion #region Data Members /// Frame number private int _frameNumber; /// Is the thumbnail cached internal bool _isThumbnailCached; /// Is the metadata cached internal bool _isMetadataCached; /// If the ColorContext is already cached internal bool _isColorContextCached = false; /// CreateOptions for this Frame private BitmapCreateOptions _createOptions; /// CacheOption for this Frame private BitmapCacheOption _cacheOption; #endregion } #endregion // BitmapFrameDecode } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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