FormatConvertedBitmap.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Imaging / FormatConvertedBitmap.cs / 1305600 / 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();
 
            IsValidForFinalizeCreation(/* throwIfInvalid = */ true);
            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 
                                ));
                    }

                    // 
                    // This is just a link in a BitmapSource chain. The memory is being used by
                    // the BitmapSource at the end of the chain, so no memory pressure needs 
                    // to be added here. 
                    //
                    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; 
                }
                finally
                {
                    if (wicFormatter != null) 
                    {
                        wicFormatter.Close(); 
                    } 
                }
            } 

            CreationCompleted = true;
            UpdateCachedSettings();
        } 

        ///  
        ///     Notification on source changing. 
        /// 
        private void SourcePropertyChangedHook(DependencyPropertyChangedEventArgs e) 
        {
            if (!e.IsASubPropertyChange)
            {
                BitmapSource newSource = e.NewValue as BitmapSource; 
                _source = newSource;
                RegisterDownloadEventSource(_source); 
                _syncObject = (newSource != null) ? newSource.SyncObject : _bitmapInit; 
            }
        } 

        internal override bool IsValidForFinalizeCreation(bool throwIfInvalid)
        {
            if (Source == null) 
            {
                if (throwIfInvalid) 
                { 
                    throw new InvalidOperationException(SR.Get(SRID.Image_NoArgument, "Source"));
                } 
                return false;
            }
            if (DestinationFormat.Palettized)
            { 
                if (DestinationPalette == null)
                { 
                    if (throwIfInvalid) 
                    {
                        throw new InvalidOperationException(SR.Get(SRID.Image_IndexedPixelFormatRequiresPalette)); 
                    }
                    return false;
                }
                else if ((1 << DestinationFormat.BitsPerPixel) < DestinationPalette.Colors.Count) 
                {
                    if (throwIfInvalid) 
                    { 
                        throw new InvalidOperationException(SR.Get(SRID.Image_PaletteColorsDoNotMatchFormat));
                    } 
                    return false;
                }
            }
 
            return true;
        } 
 
        /// 
        ///     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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