BitmapFrame.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Imaging / BitmapFrame.cs / 2 / BitmapFrame.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation
//
//  File: BitmapFrame.cs 
//
//----------------------------------------------------------------------------- 
 
using System;
using System.IO; 
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 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;
using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID;
using UnsafeNativeMethods = MS.Win32.PresentationCore.UnsafeNativeMethods;
using System.Windows.Markup;
using System.Net.Cache; 

namespace System.Windows.Media.Imaging 
{ 
    #region BitmapFrame
 
    /// 
    /// BitmapFrame abstract class
    /// 
    public abstract class BitmapFrame : BitmapSource, IUriContext 
    {
 
        #region Constructors 

        ///  
        /// Constructor
        /// 
        protected BitmapFrame()
        { 
        }
 
        ///  
        /// Internal Constructor
        ///  
        internal BitmapFrame(bool useVirtuals) : base(useVirtuals)
        {
        }
 
        /// 
        /// Create BitmapFrame from the uri or stream 
        ///  
        internal static BitmapFrame CreateFromUriOrStream(
            Uri baseUri, 
            Uri uri,
            Stream stream,
            BitmapCreateOptions createOptions,
            BitmapCacheOption cacheOption, 
            RequestCachePolicy uriCachePolicy
            ) 
        { 
            // Create a decoder and return the first frame
            if (uri != null) 
            {
                Debug.Assert((stream == null), "Both stream and uri are non-null");

                BitmapDecoder decoder = BitmapDecoder.CreateFromUriOrStream( 
                    baseUri,
                    uri, 
                    null, 
                    createOptions,
                    cacheOption, 
                    uriCachePolicy,
                    true
                    );
 
                if (decoder.Frames.Count == 0)
                { 
                    throw new System.ArgumentException(SR.Get(SRID.Image_NoDecodeFrames), "uri"); 
                }
 
                return decoder.Frames[0];
            }
            else
            { 
                Debug.Assert((stream != null), "Both stream and uri are null");
 
                BitmapDecoder decoder = BitmapDecoder.Create( 
                    stream,
                    createOptions, 
                    cacheOption
                    );

                if (decoder.Frames.Count == 0) 
                {
                    throw new System.ArgumentException(SR.Get(SRID.Image_NoDecodeFrames), "stream"); 
                } 

                return decoder.Frames[0]; 
            }
        }

        ///  
        /// Create a BitmapFrame from a Uri using BitmapCreateOptions.None and
        /// BitmapCacheOption.Default 
        ///  
        /// Uri of the Bitmap
        public static BitmapFrame Create( 
            Uri bitmapUri
            )
        {
            return Create(bitmapUri, null); 
        }
 
        ///  
        /// Create a BitmapFrame from a Uri using BitmapCreateOptions.None and
        /// BitmapCacheOption.Default 
        /// 
        /// Uri of the Bitmap
        /// Optional web request cache policy
        public static BitmapFrame Create( 
            Uri bitmapUri,
            RequestCachePolicy uriCachePolicy 
            ) 
        {
            if (bitmapUri == null) 
            {
                throw new ArgumentNullException("bitmapUri");
            }
 
            return CreateFromUriOrStream(
                null, 
                bitmapUri, 
                null,
                BitmapCreateOptions.None, 
                BitmapCacheOption.Default,
                uriCachePolicy
                );
        } 

        ///  
        /// Create a BitmapFrame from a Uri with the specified BitmapCreateOptions and 
        /// BitmapCacheOption
        ///  
        /// Uri of the Bitmap
        /// Creation options
        /// Caching option
        public static BitmapFrame Create( 
            Uri bitmapUri,
            BitmapCreateOptions createOptions, 
            BitmapCacheOption cacheOption 
            )
        { 
            return Create(bitmapUri, createOptions, cacheOption, null);
        }

        ///  
        /// Create a BitmapFrame from a Uri with the specified BitmapCreateOptions and
        /// BitmapCacheOption 
        ///  
        /// Uri of the Bitmap
        /// Creation options 
        /// Caching option
        /// Optional web request cache policy
        public static BitmapFrame Create(
            Uri bitmapUri, 
            BitmapCreateOptions createOptions,
            BitmapCacheOption cacheOption, 
            RequestCachePolicy uriCachePolicy 
            )
        { 
            if (bitmapUri == null)
            {
                throw new ArgumentNullException("bitmapUri");
            } 

            return CreateFromUriOrStream( 
                null, 
                bitmapUri,
                null, 
                createOptions,
                cacheOption,
                uriCachePolicy
                ); 
        }
 
        ///  
        /// Create a BitmapFrame from a Stream using BitmapCreateOptions.None and
        /// BitmapCacheOption.Default 
        /// 
        /// Stream of the Bitmap
        public static BitmapFrame Create(
            Stream bitmapStream 
            )
        { 
            if (bitmapStream == null) 
            {
                throw new ArgumentNullException("bitmapStream"); 
            }

            return CreateFromUriOrStream(
                null, 
                null,
                bitmapStream, 
                BitmapCreateOptions.None, 
                BitmapCacheOption.Default,
                null 
                );
        }

        ///  
        /// Create a BitmapFrame from a Stream with the specified BitmapCreateOptions and
        /// BitmapCacheOption 
        ///  
        /// Stream of the Bitmap
        /// Creation options 
        /// Caching option
        public static BitmapFrame Create(
            Stream bitmapStream,
            BitmapCreateOptions createOptions, 
            BitmapCacheOption cacheOption
            ) 
        { 
            if (bitmapStream == null)
            { 
                throw new ArgumentNullException("bitmapStream");
            }

            return CreateFromUriOrStream( 
                null,
                null, 
                bitmapStream, 
                createOptions,
                cacheOption, 
                null
                );
        }
 
        /// 
        /// Create a BitmapFrame from a BitmapSource 
        ///  
        /// Source input of the Bitmap
        public static BitmapFrame Create( 
            BitmapSource source
            )
        {
            if (source == null) 
            {
                throw new ArgumentNullException("source"); 
            } 

            BitmapMetadata metadata = null; 

            try
            {
                metadata = source.Metadata as BitmapMetadata; 
            }
            catch (System.NotSupportedException) 
            { 
                //do not throw not support exception
                //just pass null 
            }

            if (metadata != null)
            { 
                metadata = metadata.Clone();
            } 
 
            return new BitmapFrameEncode(source, null, metadata, null);
        } 

        /// 
        /// Create a BitmapFrame from a BitmapSource with the specified Thumbnail
        ///  
        /// Source input of the Bitmap
        /// Thumbnail of the resulting Bitmap 
        public static BitmapFrame Create( 
            BitmapSource source,
            BitmapSource thumbnail 
            )
        {
            if (source == null)
            { 
                throw new ArgumentNullException("source");
            } 
 
            BitmapMetadata metadata = null;
 
            try
            {
                metadata = source.Metadata as BitmapMetadata;
            } 
            catch (System.NotSupportedException)
            { 
                //do not throw not support exception 
                //just pass null
            } 


            if (metadata != null)
            { 
                metadata = metadata.Clone();
            } 
 
            return BitmapFrame.Create(source, thumbnail, metadata, null);
        } 


        /// 
        /// Create a BitmapFrame from a BitmapSource with the specified Thumbnail and metadata 
        /// 
        /// Source input of the Bitmap 
        /// Thumbnail of the resulting Bitmap 
        /// BitmapMetadata of the resulting Bitmap
        /// The ColorContexts for the resulting Bitmap 
        public static BitmapFrame Create(
            BitmapSource source,
            BitmapSource thumbnail,
            BitmapMetadata metadata, 
            ReadOnlyCollection colorContexts
            ) 
        { 
            if (source == null)
            { 
                throw new ArgumentNullException("source");
            }

            return new BitmapFrameEncode(source, thumbnail, metadata, colorContexts); 
        }
 
        #endregion 

        #region IUriContext 

        /// 
        /// Provides the base uri of the current context.
        ///  
        public abstract Uri BaseUri { get; set; }
 
        #endregion 

        #region Public Properties 

        /// 
        /// Accesses the Thumbnail property for this BitmapFrame
        ///  
        public abstract BitmapSource Thumbnail { get; }
 
        ///  
        /// Accesses the Decoder property for this BitmapFrame
        ///  
        public abstract BitmapDecoder Decoder { get; }

        /// 
        /// Accesses the Decoder property for this BitmapFrame 
        /// 
        public abstract ReadOnlyCollection ColorContexts { get; } 
 
        #endregion
 
        #region Public Properties

        /// 
        /// Create an in-place bitmap metadata writer. 
        /// 
        public abstract InPlaceBitmapMetadataWriter CreateInPlaceBitmapMetadataWriter(); 
 
        #endregion
 
        #region Internal Properties

        /// 
        /// Returns cached metadata and creates BitmapMetadata if it does not exist. 
        /// This code will demand site of origin permissions.
        ///  
        internal virtual BitmapMetadata InternalMetadata 
        {
            get { return null; } 
            set { throw new NotImplementedException(); }
        }

        #endregion 

        #region Internal Abstract 
 
        /// "Seals" the object
        internal abstract void SealObject(); 

        #endregion

        #region Data Members 

        /// IWICBitmapFrameDecode source 
        internal BitmapSourceSafeMILHandle _frameSource = null; 

        /// Thumbnail 
        internal BitmapSource _thumbnail = null;

        /// 
        /// Metadata 
        /// 
        ///  
        /// Critical - Access only granted if SiteOfOrigin demanded. 
        /// 
        [SecurityCritical] 
        internal BitmapMetadata _metadata;

        /// Decoder
        internal BitmapDecoder _decoder; 

        /// ColorContexts collection 
        internal ReadOnlyCollection _readOnlycolorContexts; 

        #endregion 
    }

    #endregion // BitmapFrame
} 


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