Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / Imaging / LateBoundBitmapDecoder.cs / 2 / LateBoundBitmapDecoder.cs
//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2003
//
// File: LateBoundBitmapDecoder.cs
//
//-----------------------------------------------------------------------------
#pragma warning disable 1634, 1691 // Allow suppression of certain presharp messages
using System;
using System.IO;
using System.IO.Packaging;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Collections.ObjectModel;
using System.Reflection;
using System.Security;
using System.Security.Permissions;
using MS.Internal;
using MS.Win32.PresentationCore;
using System.Diagnostics;
using System.Windows.Media;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Threading;
using System.Windows.Media.Imaging;
using MS.Internal.PresentationCore; // SecurityHelper
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
using System.Net;
using System.Net.Cache;
namespace System.Windows.Media.Imaging
{
#region LateBoundBitmapDecoder
///
/// LateBoundBitmapDecoder is a container for bitmap frames. Each bitmap frame is an BitmapFrame.
/// Any BitmapFrame it returns are frozen
/// be immutable.
///
public sealed class LateBoundBitmapDecoder : BitmapDecoder
{
#region Constructors
///
/// Constructor
///
///
/// Critical: This code calls into BitmapDownload.BeginDownload which is critical
///
[SecurityCritical]
internal LateBoundBitmapDecoder(
Uri baseUri,
Uri uri,
Stream stream,
BitmapCreateOptions createOptions,
BitmapCacheOption cacheOption,
RequestCachePolicy requestCachePolicy
)
: base(true)
{
_baseUri = baseUri;
_uri = uri;
_stream = stream;
_createOptions = createOptions;
_cacheOption = cacheOption;
_requestCachePolicy = requestCachePolicy;
// Check to see if we need to download content off thread
Uri uriToDecode = (_baseUri != null) ? new Uri(_baseUri, _uri) : _uri;
if (uriToDecode != null)
{
if (uriToDecode.Scheme == Uri.UriSchemeHttp ||
uriToDecode.Scheme == Uri.UriSchemeHttps)
{
// Begin the download
BitmapDownload.BeginDownload(this, uriToDecode, _requestCachePolicy, _stream);
_isDownloading = true;
}
}
if (_stream != null && !_stream.CanSeek)
{
// Begin the download
BitmapDownload.BeginDownload(this, uriToDecode, _requestCachePolicy, _stream);
_isDownloading = true;
}
}
#endregion
#region Properties
///
/// If there is an palette, return it.
/// Otherwise, return null.
/// If the LateBoundDecoder is still downloading, the returned Palette is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting palette data is OK
///
public override BitmapPalette Palette
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.Palette;
}
}
///
/// If there is an embedded color profile, return it.
/// Otherwise, return null.
/// If the LateBoundDecoder is still downloading, the returned ColorContext is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting colorcontext data is OK
///
public override ReadOnlyCollection ColorContexts
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.ColorContexts;
}
}
///
/// If there is a global thumbnail, return it.
/// Otherwise, return null. The returned source is frozen.
/// If the LateBoundDecoder is still downloading, the returned Thumbnail is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting thumbnail data is OK
///
public override BitmapSource Thumbnail
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.Thumbnail;
}
}
///
/// The info that identifies this codec.
/// If the LateBoundDecoder is still downloading, the returned CodecInfo is null.
///
///
/// The getter demands RegistryPermission(PermissionState.Unrestricted)
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Demands RegistryPermission(PermissionState.Unrestricted)
///
public override BitmapCodecInfo CodecInfo
{
[SecurityCritical]
get
{
VerifyAccess();
SecurityHelper.DemandRegistryPermission();
if (_isDownloading)
{
return null;
}
return Decoder.CodecInfo;
}
}
///
/// Access to the individual frames.
/// Since a LateBoundBitmapDecoder is downloaded asynchronously,
/// its possible the underlying frame collection may change once
/// content has been downloaded and decoded. When content is initially
/// downloading, the collection will always return at least one item
/// in the collection. When the download/decode is complete, the BitmapFrame
/// will automatically change its underlying content. i.e. Only the collection
/// object may change. The actual frame object will remain the same.
///
public override ReadOnlyCollection Frames
{
get
{
VerifyAccess();
// If the content is still being downloaded, create a collection
// with 1 item that will point to an empty bitmap
if (_isDownloading)
{
if (_readOnlyFrames == null)
{
_frames = new List((int)1);
_frames.Add(
new BitmapFrameDecode(
0,
_createOptions,
_cacheOption,
this
)
);
_readOnlyFrames = new ReadOnlyCollection(_frames);
}
return _readOnlyFrames;
}
else
{
return Decoder.Frames;
}
}
}
///
/// If there is a global preview image, return it.
/// Otherwise, return null. The returned source is frozen.
/// If the LateBoundDecoder is still downloading, the returned Preview is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting preview data is OK
///
public override BitmapSource Preview
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.Preview;
}
}
///
/// Returns the underlying decoder associated with this late bound decoder.
/// If the LateBoundDecoder is still downloading, the underlying decoder is null,
/// otherwise the underlying decoder is created on first access.
///
public BitmapDecoder Decoder
{
get
{
VerifyAccess();
if (_isDownloading || _failed)
{
return null;
}
EnsureDecoder();
return _realDecoder;
}
}
///
/// Returns if the decoder is downloading content
///
public override bool IsDownloading
{
get
{
VerifyAccess();
return _isDownloading;
}
}
#endregion
#region Methods
///
/// Ensure that the underlying decoder is created
///
private void EnsureDecoder()
{
if (_realDecoder == null)
{
_realDecoder = BitmapDecoder.CreateFromUriOrStream(
_baseUri,
_uri,
_stream,
_createOptions & ~BitmapCreateOptions.DelayCreation,
_cacheOption,
_requestCachePolicy,
true
);
// Check to see if someone already got the frames
// If so, we need to ensure that the real decoder
// references the same frame as the one we already created
// Creating a new object would be bad.
if (_readOnlyFrames != null)
{
_realDecoder.SetupFrames(null, _readOnlyFrames);
//
// The frames have been transfered to the real decoder, so we no
// longer need them.
//
_readOnlyFrames = null;
_frames = null;
}
}
}
///
/// Called when download is complete
///
internal object DownloadCallback(object arg)
{
Stream newStream = (Stream)arg;
// Assert that we are able to seek the new stream
Debug.Assert(newStream.CanSeek == true);
_stream = newStream;
// If we are not supposed to delay create, then ensure the decoder
// otherwise it will be done on first access
if ((_createOptions & BitmapCreateOptions.DelayCreation) == 0)
{
try
{
EnsureDecoder();
}
catch(Exception e)
{
#pragma warning disable 6500
return ExceptionCallback(e);
#pragma warning restore 6500
}
}
_isDownloading = false;
_downloadEvent.InvokeEvents(this, null);
return null;
}
///
/// Called when download progresses
///
internal object ProgressCallback(object arg)
{
int percentComplete = (int)arg;
_progressEvent.InvokeEvents(this, new DownloadProgressEventArgs(percentComplete));
return null;
}
///
/// Called when an exception occurs
///
internal object ExceptionCallback(object arg)
{
_isDownloading = false;
_failed = true;
_failedEvent.InvokeEvents(this, new ExceptionEventArgs((Exception)arg));
return null;
}
#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
/// Is downloading data
private bool _isDownloading;
/// Is downloading data
private bool _failed;
/// Real decoder
private BitmapDecoder _realDecoder;
///
/// the cache policy to use for web requests.
///
private RequestCachePolicy _requestCachePolicy;
#endregion
}
#endregion
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2003
//
// File: LateBoundBitmapDecoder.cs
//
//-----------------------------------------------------------------------------
#pragma warning disable 1634, 1691 // Allow suppression of certain presharp messages
using System;
using System.IO;
using System.IO.Packaging;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Collections.ObjectModel;
using System.Reflection;
using System.Security;
using System.Security.Permissions;
using MS.Internal;
using MS.Win32.PresentationCore;
using System.Diagnostics;
using System.Windows.Media;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Threading;
using System.Windows.Media.Imaging;
using MS.Internal.PresentationCore; // SecurityHelper
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
using System.Net;
using System.Net.Cache;
namespace System.Windows.Media.Imaging
{
#region LateBoundBitmapDecoder
///
/// LateBoundBitmapDecoder is a container for bitmap frames. Each bitmap frame is an BitmapFrame.
/// Any BitmapFrame it returns are frozen
/// be immutable.
///
public sealed class LateBoundBitmapDecoder : BitmapDecoder
{
#region Constructors
///
/// Constructor
///
///
/// Critical: This code calls into BitmapDownload.BeginDownload which is critical
///
[SecurityCritical]
internal LateBoundBitmapDecoder(
Uri baseUri,
Uri uri,
Stream stream,
BitmapCreateOptions createOptions,
BitmapCacheOption cacheOption,
RequestCachePolicy requestCachePolicy
)
: base(true)
{
_baseUri = baseUri;
_uri = uri;
_stream = stream;
_createOptions = createOptions;
_cacheOption = cacheOption;
_requestCachePolicy = requestCachePolicy;
// Check to see if we need to download content off thread
Uri uriToDecode = (_baseUri != null) ? new Uri(_baseUri, _uri) : _uri;
if (uriToDecode != null)
{
if (uriToDecode.Scheme == Uri.UriSchemeHttp ||
uriToDecode.Scheme == Uri.UriSchemeHttps)
{
// Begin the download
BitmapDownload.BeginDownload(this, uriToDecode, _requestCachePolicy, _stream);
_isDownloading = true;
}
}
if (_stream != null && !_stream.CanSeek)
{
// Begin the download
BitmapDownload.BeginDownload(this, uriToDecode, _requestCachePolicy, _stream);
_isDownloading = true;
}
}
#endregion
#region Properties
///
/// If there is an palette, return it.
/// Otherwise, return null.
/// If the LateBoundDecoder is still downloading, the returned Palette is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting palette data is OK
///
public override BitmapPalette Palette
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.Palette;
}
}
///
/// If there is an embedded color profile, return it.
/// Otherwise, return null.
/// If the LateBoundDecoder is still downloading, the returned ColorContext is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting colorcontext data is OK
///
public override ReadOnlyCollection ColorContexts
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.ColorContexts;
}
}
///
/// If there is a global thumbnail, return it.
/// Otherwise, return null. The returned source is frozen.
/// If the LateBoundDecoder is still downloading, the returned Thumbnail is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting thumbnail data is OK
///
public override BitmapSource Thumbnail
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.Thumbnail;
}
}
///
/// The info that identifies this codec.
/// If the LateBoundDecoder is still downloading, the returned CodecInfo is null.
///
///
/// The getter demands RegistryPermission(PermissionState.Unrestricted)
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Demands RegistryPermission(PermissionState.Unrestricted)
///
public override BitmapCodecInfo CodecInfo
{
[SecurityCritical]
get
{
VerifyAccess();
SecurityHelper.DemandRegistryPermission();
if (_isDownloading)
{
return null;
}
return Decoder.CodecInfo;
}
}
///
/// Access to the individual frames.
/// Since a LateBoundBitmapDecoder is downloaded asynchronously,
/// its possible the underlying frame collection may change once
/// content has been downloaded and decoded. When content is initially
/// downloading, the collection will always return at least one item
/// in the collection. When the download/decode is complete, the BitmapFrame
/// will automatically change its underlying content. i.e. Only the collection
/// object may change. The actual frame object will remain the same.
///
public override ReadOnlyCollection Frames
{
get
{
VerifyAccess();
// If the content is still being downloaded, create a collection
// with 1 item that will point to an empty bitmap
if (_isDownloading)
{
if (_readOnlyFrames == null)
{
_frames = new List((int)1);
_frames.Add(
new BitmapFrameDecode(
0,
_createOptions,
_cacheOption,
this
)
);
_readOnlyFrames = new ReadOnlyCollection(_frames);
}
return _readOnlyFrames;
}
else
{
return Decoder.Frames;
}
}
}
///
/// If there is a global preview image, return it.
/// Otherwise, return null. The returned source is frozen.
/// If the LateBoundDecoder is still downloading, the returned Preview is null.
///
///
/// Critical - Access unmanaged code, codecs
/// PublicOK - Getting preview data is OK
///
public override BitmapSource Preview
{
[SecurityCritical]
get
{
VerifyAccess();
if (_isDownloading)
{
return null;
}
return Decoder.Preview;
}
}
///
/// Returns the underlying decoder associated with this late bound decoder.
/// If the LateBoundDecoder is still downloading, the underlying decoder is null,
/// otherwise the underlying decoder is created on first access.
///
public BitmapDecoder Decoder
{
get
{
VerifyAccess();
if (_isDownloading || _failed)
{
return null;
}
EnsureDecoder();
return _realDecoder;
}
}
///
/// Returns if the decoder is downloading content
///
public override bool IsDownloading
{
get
{
VerifyAccess();
return _isDownloading;
}
}
#endregion
#region Methods
///
/// Ensure that the underlying decoder is created
///
private void EnsureDecoder()
{
if (_realDecoder == null)
{
_realDecoder = BitmapDecoder.CreateFromUriOrStream(
_baseUri,
_uri,
_stream,
_createOptions & ~BitmapCreateOptions.DelayCreation,
_cacheOption,
_requestCachePolicy,
true
);
// Check to see if someone already got the frames
// If so, we need to ensure that the real decoder
// references the same frame as the one we already created
// Creating a new object would be bad.
if (_readOnlyFrames != null)
{
_realDecoder.SetupFrames(null, _readOnlyFrames);
//
// The frames have been transfered to the real decoder, so we no
// longer need them.
//
_readOnlyFrames = null;
_frames = null;
}
}
}
///
/// Called when download is complete
///
internal object DownloadCallback(object arg)
{
Stream newStream = (Stream)arg;
// Assert that we are able to seek the new stream
Debug.Assert(newStream.CanSeek == true);
_stream = newStream;
// If we are not supposed to delay create, then ensure the decoder
// otherwise it will be done on first access
if ((_createOptions & BitmapCreateOptions.DelayCreation) == 0)
{
try
{
EnsureDecoder();
}
catch(Exception e)
{
#pragma warning disable 6500
return ExceptionCallback(e);
#pragma warning restore 6500
}
}
_isDownloading = false;
_downloadEvent.InvokeEvents(this, null);
return null;
}
///
/// Called when download progresses
///
internal object ProgressCallback(object arg)
{
int percentComplete = (int)arg;
_progressEvent.InvokeEvents(this, new DownloadProgressEventArgs(percentComplete));
return null;
}
///
/// Called when an exception occurs
///
internal object ExceptionCallback(object arg)
{
_isDownloading = false;
_failed = true;
_failedEvent.InvokeEvents(this, new ExceptionEventArgs((Exception)arg));
return null;
}
#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
/// Is downloading data
private bool _isDownloading;
/// Is downloading data
private bool _failed;
/// Real decoder
private BitmapDecoder _realDecoder;
///
/// the cache policy to use for web requests.
///
private RequestCachePolicy _requestCachePolicy;
#endregion
}
#endregion
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PasswordBoxAutomationPeer.cs
- DataTrigger.cs
- NativeCppClassAttribute.cs
- WebBrowser.cs
- SelectedPathEditor.cs
- ValidationRule.cs
- AnnotationObservableCollection.cs
- DataRecordInternal.cs
- NetworkInterface.cs
- DispatcherHookEventArgs.cs
- Utils.cs
- QilTargetType.cs
- ToolBarButtonClickEvent.cs
- basenumberconverter.cs
- DataGridColumnHeadersPresenterAutomationPeer.cs
- DurableEnlistmentState.cs
- SettingsBindableAttribute.cs
- JsonServiceDocumentSerializer.cs
- TemplateXamlParser.cs
- Processor.cs
- SoundPlayer.cs
- PersonalizableAttribute.cs
- RPIdentityRequirement.cs
- DispatcherExceptionEventArgs.cs
- MenuItemStyleCollection.cs
- DetailsViewRow.cs
- _OverlappedAsyncResult.cs
- MachineKeyConverter.cs
- GetPageNumberCompletedEventArgs.cs
- HttpListenerException.cs
- CachedPathData.cs
- SecureUICommand.cs
- PointAnimationUsingKeyFrames.cs
- LayoutTableCell.cs
- SizeConverter.cs
- PeerNameRecordCollection.cs
- ItemsControl.cs
- RtfControls.cs
- RijndaelManaged.cs
- ReadOnlyDictionary.cs
- CqlWriter.cs
- ASCIIEncoding.cs
- GlobalizationAssembly.cs
- PersonalizationEntry.cs
- AsyncCompletedEventArgs.cs
- ellipse.cs
- SchemaComplexType.cs
- RbTree.cs
- PathSegmentCollection.cs
- DataGridViewIntLinkedList.cs
- ConfigurationStrings.cs
- InvokePattern.cs
- DynamicDocumentPaginator.cs
- Buffer.cs
- DefaultSerializationProviderAttribute.cs
- FixUp.cs
- Win32PrintDialog.cs
- ReadWriteControlDesigner.cs
- XmlEncoding.cs
- GridViewUpdateEventArgs.cs
- CompilerWrapper.cs
- XamlTreeBuilder.cs
- GrabHandleGlyph.cs
- CallInfo.cs
- DoubleUtil.cs
- Int32KeyFrameCollection.cs
- DelegateTypeInfo.cs
- SoapAttributeOverrides.cs
- UnmanagedBitmapWrapper.cs
- Point3DValueSerializer.cs
- BadImageFormatException.cs
- CTreeGenerator.cs
- DataGridViewCellParsingEventArgs.cs
- Effect.cs
- DetailsViewRowCollection.cs
- Sentence.cs
- ServiceOperationParameter.cs
- SByte.cs
- PageRequestManager.cs
- DesignTimeParseData.cs
- LinkedList.cs
- GridViewRowEventArgs.cs
- RecognitionResult.cs
- SqlCacheDependency.cs
- CodeIdentifier.cs
- CSharpCodeProvider.cs
- PassportIdentity.cs
- WeakReferenceKey.cs
- BaseProcessProtocolHandler.cs
- GridItemPattern.cs
- ReflectionHelper.cs
- SchemaDeclBase.cs
- DefaultDiscoveryServiceExtension.cs
- RegexGroup.cs
- WebPartConnection.cs
- LineUtil.cs
- Knowncolors.cs
- XmlSchemaCompilationSettings.cs
- DBSqlParser.cs
- ActivityInterfaces.cs