FormatConvertedBitmap.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 / FormatConvertedBitmap.cs / 1 / FormatConvertedBitmap.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation.  All Rights Reserved.
//
//  File: FormatConvertedBitmap.cs 
//
//----------------------------------------------------------------------------- 
 

using System; 
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel; 
using System.ComponentModel.Design.Serialization;
using System.Reflection; 
using MS.Internal; 
using MS.Win32.PresentationCore;
using System.Security; 
using System.Security.Permissions;
using System.Diagnostics;
using System.Windows.Media;
using System.Globalization; 
using System.Runtime.InteropServices;
using System.Windows.Media.Animation; 
using System.Windows.Media.Composition; 

using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID;

namespace System.Windows.Media.Imaging
{ 
    #region FormatConvertedBitmap
 
    ///  
    /// FormatConvertedBitmap provides caching functionality for a BitmapSource.
    ///  
    public sealed partial class FormatConvertedBitmap : Imaging.BitmapSource, ISupportInitialize
    {
        /// 
        /// Constructor 
        /// 
        public FormatConvertedBitmap() : base(true) 
        { 
        }
 
        /// 
        /// Construct a FormatConvertedBitmap
        /// 
        /// BitmapSource to apply to the format conversion to 
        /// Destionation Format to  apply to the bitmap
        /// Palette if format is palettized 
        /// Alpha threshold 
        public FormatConvertedBitmap(BitmapSource source, PixelFormat destinationFormat, BitmapPalette destinationPalette, double alphaThreshold)
            : base(true) // Use base class virtuals 
        {
            if (source == null)
            {
                throw new ArgumentNullException("source"); 
            }
            if (alphaThreshold < (double)(0.0) || alphaThreshold > (double)(100.0)) 
            { 
                throw new ArgumentException(SR.Get(SRID.Image_AlphaThresholdOutOfRange));
            } 

            _bitmapInit.BeginInit();

            Source = source; 
            DestinationFormat = destinationFormat;
            DestinationPalette = destinationPalette; 
            AlphaThreshold = alphaThreshold; 

            _bitmapInit.EndInit(); 
            FinalizeCreation();
        }

        // ISupportInitialize 

        ///  
        /// Prepare the bitmap to accept initialize paramters. 
        /// 
        public void BeginInit() 
        {
            WritePreamble();
            _bitmapInit.BeginInit();
        } 

        ///  
        /// Prepare the bitmap to accept initialize paramters. 
        /// 
        ///  
        /// Critical - access critical resources
        /// PublicOK - All inputs verified
        /// 
        [SecurityCritical ] 
        public void EndInit()
        { 
            WritePreamble(); 
            _bitmapInit.EndInit();
 
            if (Source == null)
            {
                throw new InvalidOperationException(SR.Get(SRID.Image_NoArgument, "Source"));
            } 
            if (DestinationFormat.Palettized)
            { 
                if (DestinationPalette == null) 
                {
                    throw new InvalidOperationException(SR.Get(SRID.Image_IndexedPixelFormatRequiresPalette)); 
                }
                else if ((1 << DestinationFormat.BitsPerPixel) < DestinationPalette.Colors.Count)
                {
                    throw new InvalidOperationException(SR.Get(SRID.Image_PaletteColorsDoNotMatchFormat)); 
                }
            } 
 
            FinalizeCreation();
        } 

        private void ClonePrequel(FormatConvertedBitmap otherFormatConvertedBitmap)
        {
            BeginInit(); 
        }
 
        private void ClonePostscript(FormatConvertedBitmap otherFormatConvertedBitmap) 
        {
            EndInit(); 
        }

        ///
        /// Create the unmanaged resources 
        ///
        ///  
        /// Critical - access critical resource 
        /// 
        [SecurityCritical] 
        internal override void FinalizeCreation()
        {
            _bitmapInit.EnsureInitializedComplete();
            BitmapSourceSafeMILHandle wicFormatter = null; 

            using (FactoryMaker factoryMaker = new FactoryMaker()) 
            { 
                try
                { 
                    IntPtr wicFactory = factoryMaker.ImagingFactoryPtr;

                    HRESULT.Check(UnsafeNativeMethods.WICImagingFactory.CreateFormatConverter(
                            wicFactory, 
                            out wicFormatter));
 
                    SafeMILHandle internalPalette; 
                    if (DestinationPalette != null)
                        internalPalette = DestinationPalette.InternalPalette; 
                    else
                        internalPalette = new SafeMILHandle();

                    Guid format = DestinationFormat.Guid; 

                    lock (_syncObject) 
                    { 
                        HRESULT.Check(UnsafeNativeMethods.WICFormatConverter.Initialize(
                                wicFormatter, 
                                Source.WicSourceHandle,
                                ref format,
                                DitherType.DitherTypeErrorDiffusion,
                                internalPalette, 
                                AlphaThreshold,
                                WICPaletteType.WICPaletteTypeOptimal 
                                )); 
                    }
 
                    WicSourceHandle = wicFormatter;

                    // Even if our source is cached, format conversion is expensive and so we'll
                    // always maintain our own cache for the purpose of rendering. 
                    _isSourceCached = false;
                } 
                catch 
                {
                    _bitmapInit.Reset(); 
                    throw;
                }
            }
 
            CreationCompleted = true;
            UpdateCachedSettings(); 
        } 

        ///  
        ///     Notification on source changing.
        /// 
        private void SourcePropertyChangedHook(DependencyPropertyChangedEventArgs e)
        { 
            if (!e.IsASubPropertyChange)
            { 
                BitmapSource newSource = e.NewValue as BitmapSource; 
                _source = newSource;
 
                _syncObject = (newSource != null) ? newSource.SyncObject : _bitmapInit;
            }
        }
 
        /// 
        ///     Notification on destination format changing. 
        ///  
        private void DestinationFormatPropertyChangedHook(DependencyPropertyChangedEventArgs e)
        { 
            if (!e.IsASubPropertyChange)
            {
                _destinationFormat = (PixelFormat)e.NewValue;
            } 
        }
 
        ///  
        ///     Notification on destination palette changing.
        ///  
        private void DestinationPalettePropertyChangedHook(DependencyPropertyChangedEventArgs e)
        {
            if (!e.IsASubPropertyChange)
            { 
                _destinationPalette = e.NewValue as BitmapPalette;
            } 
        } 

        ///  
        ///     Notification on alpha threshold changing.
        /// 
        private void AlphaThresholdPropertyChangedHook(DependencyPropertyChangedEventArgs e)
        { 
            if (!e.IsASubPropertyChange)
            { 
                _alphaThreshold = (double)e.NewValue; 
            }
        } 

        /// 
        ///     Coerce Source
        ///  
        private static object CoerceSource(DependencyObject d, object value)
        { 
            FormatConvertedBitmap bitmap = (FormatConvertedBitmap)d; 
            if (!bitmap._bitmapInit.IsInInit)
            { 
                return bitmap._source;
            }
            else
            { 
                return value;
            } 
        } 

        ///  
        ///     Coerce DestinationFormat
        /// 
        private static object CoerceDestinationFormat(DependencyObject d, object value)
        { 
            FormatConvertedBitmap bitmap = (FormatConvertedBitmap)d;
            if (!bitmap._bitmapInit.IsInInit) 
            { 
                return bitmap._destinationFormat;
            } 
            else
            {
                //
                // If the client is trying to create a FormatConvertedBitmap with a 
                // DestinationFormat == PixelFormats.Default, then coerce it to either
                // the Source bitmaps format (providing the Source bitmap is non-null) 
                // or the original DP value. 
                //
                if (((PixelFormat)value).Format == PixelFormatEnum.Default) 
                {
                    if (bitmap.Source != null)
                    {
                        return bitmap.Source.Format; 
                    }
                    else 
                    { 
                        return bitmap._destinationFormat;
                    } 
                }
                else
                {
                    return value; 
                }
            } 
        } 

        ///  
        ///     Coerce DestinationPalette
        /// 
        private static object CoerceDestinationPalette(DependencyObject d, object value)
        { 
            FormatConvertedBitmap bitmap = (FormatConvertedBitmap)d;
            if (!bitmap._bitmapInit.IsInInit) 
            { 
                return bitmap._destinationPalette;
            } 
            else
            {
                return value;
            } 
        }
 
        ///  
        ///     Coerce Transform
        ///  
        private static object CoerceAlphaThreshold(DependencyObject d, object value)
        {
            FormatConvertedBitmap bitmap = (FormatConvertedBitmap)d;
            if (!bitmap._bitmapInit.IsInInit) 
            {
                return bitmap._alphaThreshold; 
            } 
            else
            { 
                return value;
            }
        }
 
        #region Data Members
 
        private BitmapSource _source; 

        private PixelFormat _destinationFormat; 

        private BitmapPalette _destinationPalette;

        private double _alphaThreshold; 

        #endregion 
    } 

    #endregion // FormatConvertedBitmap 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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