XpsImageSerializationService.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Print / Reach / Serialization / XpsImageSerializationService.cs / 1 / XpsImageSerializationService.cs
                        
                        
                            /*++ 

    Copyright (C) 2004 - 2005 Microsoft Corporation
    All rights reserved.
 
    Module Name:
        XpsImageSerializationService.cs 
 
    Abstract:
        This file implements the XpsImageSerializationService 
        used by the Xps Serialization APIs for serializing
        images to a Xps package.

    Author: 
        [....] ([....]) 1-December-2004
 
    Revision History: 
    07/12/2005: [....]: Reach -> Xps
--*/ 

using System;
using System.IO;
using System.Windows.Media; 
using System.Windows.Media.Imaging;
using System.Security; 
using System.Security.Permissions; 
using System.Windows.Xps.Packaging;
 
using MS.Internal;

namespace System.Windows.Xps.Serialization
{ 
    /// 
    /// This class implements a support service for serialization 
    /// of BitmapSource instances to a Xps package. 
    /// 
    internal class XpsImageSerializationService 
    {
        #region Public methods

        ///  
        /// This method retrieves the BitmapEncoder to be used for
        /// serialization based on the specified BitmapSource. 
        ///  
        /// 
        /// A reference to a BitmapSource that will be encoded. 
        /// 
        /// 
        /// Returns a reference to a new BitmapEncoder.
        ///  
        /// 
        /// Critical - 1)   Asserts to access the registry.  May return path information which 
        ///                 could disclose windows directory (ie. c:\windows\media\sound.wav) 
        ///
        ///  
        [SecurityCritical]
        public
        BitmapEncoder
        GetEncoder( 
            BitmapSource bitmapSource
            ) 
        { 
            BitmapEncoder encoder = null;
 
            if (bitmapSource is BitmapFrame)
            {
                //
                // This code gets the encoder based on the decoder that was 
                // used for this specific BitmapSource.
                // 
                BitmapFrame bitmapImage = bitmapSource as BitmapFrame; 
                BitmapCodecInfo codecInfo = null;
 
                if (bitmapImage != null && bitmapImage.Decoder != null)
                    codecInfo = bitmapImage.Decoder.CodecInfo;

                if (codecInfo != null) 
                {
                    (new RegistryPermission(PermissionState.Unrestricted)).Assert(); 
                    try 
                    {
                        encoder = BitmapEncoder.Create(codecInfo.ContainerFormat); 
                    }
                    finally
                    {
                        RegistryPermission.RevertAssert(); 
                    }
 
                    // Avoid GIF encoder which does not save transparency well 
                    if ( !( encoder is JpegBitmapEncoder ||
                            encoder is PngBitmapEncoder || 
                            encoder is TiffBitmapEncoder ||
                            encoder is WmpBitmapEncoder)
                       )
                    { 
                        encoder = null;
                    } 
                } 
            }
 
            //
            // The code above assumes that the BitmapSource is actually
            // a BitmapImage.  If it is not then we assume Png and use
            // that encoder. 
            //
            if (encoder == null) 
            { 
                if (Microsoft.Internal.AlphaFlattener.Utility.NeedPremultiplyAlpha(bitmapSource))
                { 
                    encoder = new WmpBitmapEncoder();
                }
                else
                { 
                    encoder = new PngBitmapEncoder();
                } 
            } 

            return encoder; 
        }


        ///  
        /// This method determines if a bitmap is of a supported
        /// Xps Mime type 
        ///  
        /// 
        /// A reference to a BitmapSource to be tested. 
        /// 
        /// 
        /// Returns true if the bitmapSource is of supported mimetype
        ///  
        /// 
        /// Critical - 1)   Asserts to access the registry.  May return path information which 
        ///                 could disclose windows directory (ie. c:\windows\media\sound.wav) 
        ///
        ///  
        [SecurityCritical]
        public
        bool
        IsSupportedMimeType( 
            BitmapSource bitmapSource
            ) 
        { 
            BitmapCodecInfo codecInfo = null;
            string imageMimeType = ""; 

            if (bitmapSource is BitmapFrame)
            {
                // 
                // This code gets the encoder based on the decoder that was
                // used for this specific BitmapSource. 
                // 
                BitmapFrame bitmapFrame = bitmapSource as BitmapFrame;
 
                if (bitmapFrame != null && bitmapFrame.Decoder != null)
                {
                    codecInfo = bitmapFrame.Decoder.CodecInfo;
                } 
            }
 
            if (codecInfo != null) 
            {
                (new RegistryPermission(PermissionState.Unrestricted)).Assert(); 
                try
                {
                    imageMimeType = codecInfo.MimeTypes;
                } 
                finally
                { 
                    RegistryPermission.RevertAssert(); 
                }
            } 
            int start = 0;
            int comma = imageMimeType.IndexOf(',', start);
            bool foundType = false;
            // 
            // Test all strings before commas
            // 
            if( comma != -1 ) 
            {
                while (comma != -1 && !foundType) 
                {
                    string subString =  imageMimeType.Substring(start, comma);
                    foundType = XpsManager.SupportedImageType( new ContentType(subString) );
                    start = comma+1; 
                    comma = imageMimeType.IndexOf(',', start);
                } 
 
            }
 
            //
            // If we still have not found a supported type
            // Test the remainder of the string
            // 
            if( !foundType )
            { 
                foundType = XpsManager.SupportedImageType( new ContentType(imageMimeType.Substring(start)) ); 
            }
 
            return foundType;
        }

        ///  
        /// This method verifies whether a given BitmapSource
        /// is serializable by this service. 
        ///  
        /// 
        /// A reference to a BitmapSource to be checked. 
        /// 
        /// 
        /// A boolean value specifing serializability.
        ///  
        public
        bool 
        VerifyImageSourceSerializability( 
            BitmapSource bitmapSource
            ) 
        {
            throw new NotImplementedException();
        }
 
        /// 
        /// This method serializes a given BitmapSource to a 
        /// stream and returns a reference to the stream. 
        /// 
        ///  
        /// A reference to a BitmapSource to be serialized.
        /// 
        /// 
        /// A reference to a Stream where BitmapSource was serialized. 
        /// 
        public 
        Stream 
        SerializeToStream(
            BitmapSource bitmapSource 
            )
        {
            throw new NotImplementedException();
        } 

        #endregion Public methods 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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