DrawingImage.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / DrawingImage.cs / 1 / DrawingImage.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: DrawingImage class 
//                  An ImageSource with a Drawing for content
// 
//
// History:
//  05/26/2005 : [....] - Created it
// 
//---------------------------------------------------------------------------
 
using MS.Internal; 
using System;
using System.ComponentModel; 
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media; 
using System.Windows.Media.Animation;
using System.Windows.Media.Composition; 
using System.Windows.Media.Imaging; 

namespace System.Windows.Media 
{
    /// 
    /// The class definition for DrawingImage
    ///  
    public sealed partial class DrawingImage : ImageSource
    { 
        ///  
        /// Default DrawingImage ctor
        ///  
        public DrawingImage()
        {
        }
 
        /// 
        /// DrawingImage ctor that takes a Drawing 
        ///  
        /// The content of the DrawingImage
        public DrawingImage(Drawing drawing) 
        {
            Drawing = drawing;
        }
 
        /// 
        /// Width of the DrawingImage 
        ///  
        public override double Width
        { 
            get
            {
                ReadPreamble();
 
                return Size.Width;
            } 
        } 

        ///  
        /// Height of the DrawingImage
        /// 
        public override double Height
        { 
            get
            { 
                ReadPreamble(); 

                return Size.Height; 
            }
        }

        ///  
        /// Get the Metadata of the DrawingImage
        ///  
        public override ImageMetadata Metadata 
        {
            get 
            {
                ReadPreamble();

                // DrawingImage does not have any metadata currently defined. 
                return null;
            } 
        } 

        ///  
        /// Size for the DrawingImage
        /// 
        internal override Size Size
        { 
            get
            { 
                Drawing drawing = Drawing; 

                if (drawing != null) 
                {
                    Size size = drawing.GetBounds().Size;

                    if (!size.IsEmpty) 
                    {
                        return size; 
                    } 
                    else
                    { 
                        return new Size();
                    }
                }
                else 
                {
                    return new Size(); 
                } 
            }
        } 

        /// 
        /// Precompute is called during the frame preparation phase. Derived classes
        /// typically check if the brush requires realizations during this phase. 
        /// 
        internal override void Precompute() 
        { 
            Drawing drawing = Drawing;
 
            _requiresRealizationUpdates = false;
            if (drawing != null)
            {
                drawing.PrecomputeCore(); 
                _requiresRealizationUpdates = drawing.RequiresRealizationUpdates;
            } 
        } 

        ///  
        /// Checks if realization updates are requried for this resource.
        /// 
        internal override bool RequiresRealizationUpdates { get { return _requiresRealizationUpdates; } }
 
        /// 
        /// Derived classes must override this method and update realizations on dependent 
        /// resources if required. 
        /// 
        internal override void UpdateRealizations(RealizationContext ctx) 
        {
            if (_requiresRealizationUpdates)
            {
                Drawing drawing = Drawing; 
                Debug.Assert(drawing != null); // Otherwise _requiresRealizationUpdates would be false.
 
                drawing.UpdateRealizations(ctx); 
            }
        } 

        /// 
        /// This node can introduce graphness
        ///  
        internal  override bool CanIntroduceGraphness()
        { 
            return true; 
        }
 
        private bool _requiresRealizationUpdates;
    }
}

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

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