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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
//
using System.IO;
using Microsoft.Win32.SafeHandles;
namespace System.Windows.Media.Imaging
{
#region UnknownBitmapDecoder
/// <summary>
/// The built-in Microsoft Unknown (Bitmap) Decoder.
/// </summary>
internal sealed class UnknownBitmapDecoder : BitmapDecoder
{
/// <summary>
/// This class is to allow us to call CoInitialize when the UnknownBitmapDecoder
/// is created, so that the unmanaged dll does not get unload until we are.
/// </summary>
private class CoInitSafeHandle : SafeMILHandle
{
public CoInitSafeHandle()
{
MS.Win32.PresentationCore.UnsafeNativeMethods.WICCodec.CoInitialize(IntPtr.Zero);
}
protected override bool ReleaseHandle()
{
MS.Win32.PresentationCore.UnsafeNativeMethods.WICCodec.CoUninitialize();
return true;
}
}
/// <summary>
/// Don't allow construction of a decoder with no params
/// </summary>
private UnknownBitmapDecoder()
{
}
/// <summary>
/// Internal Constructor
/// </summary>
internal UnknownBitmapDecoder(
SafeMILHandle decoderHandle,
BitmapDecoder decoder,
Uri baseUri,
Uri uri,
Stream stream,
BitmapCreateOptions createOptions,
BitmapCacheOption cacheOption,
bool insertInDecoderCache,
bool originalWritable,
Stream uriStream,
UnmanagedMemoryStream unmanagedMemoryStream,
SafeFileHandle safeFilehandle
) : base(decoderHandle, decoder, baseUri, uri, stream, createOptions, cacheOption, insertInDecoderCache, originalWritable, uriStream, unmanagedMemoryStream, safeFilehandle)
{
}
#region Internal Abstract
/// Need to implement this to derive from the "sealed" object
internal override void SealObject()
{
throw new NotImplementedException();
}
#endregion
/// <summary>
/// Store a safe handle to take care of calling CoInitialize
/// and CoUninitialize for us when the object is created/disposed.
/// </summary>
private CoInitSafeHandle _safeHandle = new CoInitSafeHandle();
}
#endregion
}
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