RadialGradientBrush.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / RadialGradientBrush.cs / 1305600 / RadialGradientBrush.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
// Description: This file contains the implementation of RadialGradientBrush. 
//              The RadialGradientBrush is a GradientBrush which defines its
//              Gradient as a radial interpolation within an Ellipse. 
// 
// History:
//  05/08/2003 : [....] - Created it. 
//  09/21/2004 : timothyc - Added GradientStopCollection constructor.
//
//---------------------------------------------------------------------------
 
using MS.Internal;
using MS.Internal.PresentationCore; 
using System; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Diagnostics;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows; 
using System.Windows.Media.Animation;
using System.Windows.Media.Composition; 
using System.Security; 
using System.Security.Permissions;
 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;

namespace System.Windows.Media 
{
    ///  
    /// RadialGradientBrush - This GradientBrush defines its Gradient as an interpolation 
    /// within an Ellipse.
    ///  
    public sealed partial class RadialGradientBrush : GradientBrush
    {
        #region Constructors
 
        /// 
        /// Default constructor for RadialGradientBrush.  The resulting brush has no content. 
        ///  
        public RadialGradientBrush() : base()
        { 
        }

        /// 
        /// RadialGradientBrush Constructor 
        /// Constructs a RadialGradientBrush with two colors specified for GradientStops at
        /// offsets 0.0 and 1.0. 
        ///  
        ///  The Color at offset 0.0. 
        ///  The Color at offset 1.0.  
        public RadialGradientBrush(Color startColor,
                                   Color endColor) : base()
        {
            GradientStops.Add(new GradientStop(startColor, 0.0)); 
            GradientStops.Add(new GradientStop(endColor, 1.0));
        } 
 
        /// 
        /// RadialGradientBrush Constructor 
        /// Constructs a RadialGradientBrush with GradientStops set to the passed-in
        /// collection.
        /// 
        ///  GradientStopCollection to set on this brush.  
        public RadialGradientBrush(GradientStopCollection gradientStopCollection)
                                                   : base(gradientStopCollection) 
        { 
        }
 

        #endregion Constructors

        ///  
        ///   Critical: This code acceses an unsafe code block
        ///   TreatAsSafe: This does not expose any data uses all local variables. 
        ///   Sending instructions to the channel is considered a safe operation.Also 
        ///   all calls to copybytes have been verified so the operation is safe
        ///  
        [SecurityCritical,SecurityTreatAsSafe]
        private void ManualUpdateResource(DUCE.Channel channel, bool skipOnChannelCheck)
        {
            // If we're told we can skip the channel check, then we must be on channel 
            Debug.Assert(!skipOnChannelCheck || _duceResource.IsOnChannel(channel));
 
            if (skipOnChannelCheck || _duceResource.IsOnChannel(channel)) 
            {
                Transform vTransform = Transform; 
                Transform vRelativeTransform = RelativeTransform;
                GradientStopCollection vGradientStops = GradientStops;

                DUCE.ResourceHandle hTransform; 
                if (vTransform == null ||
                    Object.ReferenceEquals(vTransform, Transform.Identity) 
                    ) 
                {
                    hTransform = DUCE.ResourceHandle.Null; 
                }
                else
                {
                    hTransform = ((DUCE.IResource)vTransform).GetHandle(channel); 
                }
                DUCE.ResourceHandle hRelativeTransform; 
                if (vRelativeTransform == null || 
                    Object.ReferenceEquals(vRelativeTransform, Transform.Identity)
                    ) 
                {
                    hRelativeTransform = DUCE.ResourceHandle.Null;
                }
                else 
                {
                    hRelativeTransform = ((DUCE.IResource)vRelativeTransform).GetHandle(channel); 
                } 
                DUCE.ResourceHandle hOpacityAnimations = GetAnimationResourceHandle(OpacityProperty, channel);
                DUCE.ResourceHandle hCenterAnimations = GetAnimationResourceHandle(CenterProperty, channel); 
                DUCE.ResourceHandle hRadiusXAnimations = GetAnimationResourceHandle(RadiusXProperty, channel);
                DUCE.ResourceHandle hRadiusYAnimations = GetAnimationResourceHandle(RadiusYProperty, channel);
                DUCE.ResourceHandle hGradientOriginAnimations = GetAnimationResourceHandle(GradientOriginProperty, channel);
 
                DUCE.MILCMD_RADIALGRADIENTBRUSH data;
                unsafe 
                { 
                    data.Type = MILCMD.MilCmdRadialGradientBrush;
                    data.Handle = _duceResource.GetHandle(channel); 
                    double tempOpacity = Opacity;
                    DUCE.CopyBytes((byte*)&data.Opacity, (byte*)&tempOpacity, 8);
                    data.hOpacityAnimations = hOpacityAnimations;
                    data.hTransform = hTransform; 
                    data.hRelativeTransform = hRelativeTransform;
                    data.ColorInterpolationMode = ColorInterpolationMode; 
                    data.MappingMode = MappingMode; 
                    data.SpreadMethod = SpreadMethod;
 
                    Point tempCenter = Center;
                    DUCE.CopyBytes((byte*)&data.Center, (byte*)&tempCenter, 16);
                    data.hCenterAnimations = hCenterAnimations;
                    double tempRadiusX = RadiusX; 
                    DUCE.CopyBytes((byte*)&data.RadiusX, (byte*)&tempRadiusX, 8);
                    data.hRadiusXAnimations = hRadiusXAnimations; 
                    double tempRadiusY = RadiusY; 
                    DUCE.CopyBytes((byte*)&data.RadiusY, (byte*)&tempRadiusY, 8);
                    data.hRadiusYAnimations = hRadiusYAnimations; 
                    Point tempGradientOrigin = GradientOrigin;
                    DUCE.CopyBytes((byte*)&data.GradientOrigin, (byte*)&tempGradientOrigin, 16);
                    data.hGradientOriginAnimations = hGradientOriginAnimations;
 
                    // NTRAID#Longhorn-1011154-2004/8/12-asecchia GradientStopCollection:  Need to enforce upper-limit of gradient stop capacity
 
                    int count = (vGradientStops == null) ? 0 : vGradientStops.Count; 
                    data.GradientStopsSize = (UInt32)(sizeof(DUCE.MIL_GRADIENTSTOP)*count);
 
                    channel.BeginCommand(
                        (byte*)&data,
                        sizeof(DUCE.MILCMD_RADIALGRADIENTBRUSH),
                        sizeof(DUCE.MIL_GRADIENTSTOP)*count 
                        );
 
                    for (int i=0; i 
    /// RadialGradientBrush - This GradientBrush defines its Gradient as an interpolation 
    /// within an Ellipse.
    ///  
    public sealed partial class RadialGradientBrush : GradientBrush
    {
        #region Constructors
 
        /// 
        /// Default constructor for RadialGradientBrush.  The resulting brush has no content. 
        ///  
        public RadialGradientBrush() : base()
        { 
        }

        /// 
        /// RadialGradientBrush Constructor 
        /// Constructs a RadialGradientBrush with two colors specified for GradientStops at
        /// offsets 0.0 and 1.0. 
        ///  
        ///  The Color at offset 0.0. 
        ///  The Color at offset 1.0.  
        public RadialGradientBrush(Color startColor,
                                   Color endColor) : base()
        {
            GradientStops.Add(new GradientStop(startColor, 0.0)); 
            GradientStops.Add(new GradientStop(endColor, 1.0));
        } 
 
        /// 
        /// RadialGradientBrush Constructor 
        /// Constructs a RadialGradientBrush with GradientStops set to the passed-in
        /// collection.
        /// 
        ///  GradientStopCollection to set on this brush.  
        public RadialGradientBrush(GradientStopCollection gradientStopCollection)
                                                   : base(gradientStopCollection) 
        { 
        }
 

        #endregion Constructors

        ///  
        ///   Critical: This code acceses an unsafe code block
        ///   TreatAsSafe: This does not expose any data uses all local variables. 
        ///   Sending instructions to the channel is considered a safe operation.Also 
        ///   all calls to copybytes have been verified so the operation is safe
        ///  
        [SecurityCritical,SecurityTreatAsSafe]
        private void ManualUpdateResource(DUCE.Channel channel, bool skipOnChannelCheck)
        {
            // If we're told we can skip the channel check, then we must be on channel 
            Debug.Assert(!skipOnChannelCheck || _duceResource.IsOnChannel(channel));
 
            if (skipOnChannelCheck || _duceResource.IsOnChannel(channel)) 
            {
                Transform vTransform = Transform; 
                Transform vRelativeTransform = RelativeTransform;
                GradientStopCollection vGradientStops = GradientStops;

                DUCE.ResourceHandle hTransform; 
                if (vTransform == null ||
                    Object.ReferenceEquals(vTransform, Transform.Identity) 
                    ) 
                {
                    hTransform = DUCE.ResourceHandle.Null; 
                }
                else
                {
                    hTransform = ((DUCE.IResource)vTransform).GetHandle(channel); 
                }
                DUCE.ResourceHandle hRelativeTransform; 
                if (vRelativeTransform == null || 
                    Object.ReferenceEquals(vRelativeTransform, Transform.Identity)
                    ) 
                {
                    hRelativeTransform = DUCE.ResourceHandle.Null;
                }
                else 
                {
                    hRelativeTransform = ((DUCE.IResource)vRelativeTransform).GetHandle(channel); 
                } 
                DUCE.ResourceHandle hOpacityAnimations = GetAnimationResourceHandle(OpacityProperty, channel);
                DUCE.ResourceHandle hCenterAnimations = GetAnimationResourceHandle(CenterProperty, channel); 
                DUCE.ResourceHandle hRadiusXAnimations = GetAnimationResourceHandle(RadiusXProperty, channel);
                DUCE.ResourceHandle hRadiusYAnimations = GetAnimationResourceHandle(RadiusYProperty, channel);
                DUCE.ResourceHandle hGradientOriginAnimations = GetAnimationResourceHandle(GradientOriginProperty, channel);
 
                DUCE.MILCMD_RADIALGRADIENTBRUSH data;
                unsafe 
                { 
                    data.Type = MILCMD.MilCmdRadialGradientBrush;
                    data.Handle = _duceResource.GetHandle(channel); 
                    double tempOpacity = Opacity;
                    DUCE.CopyBytes((byte*)&data.Opacity, (byte*)&tempOpacity, 8);
                    data.hOpacityAnimations = hOpacityAnimations;
                    data.hTransform = hTransform; 
                    data.hRelativeTransform = hRelativeTransform;
                    data.ColorInterpolationMode = ColorInterpolationMode; 
                    data.MappingMode = MappingMode; 
                    data.SpreadMethod = SpreadMethod;
 
                    Point tempCenter = Center;
                    DUCE.CopyBytes((byte*)&data.Center, (byte*)&tempCenter, 16);
                    data.hCenterAnimations = hCenterAnimations;
                    double tempRadiusX = RadiusX; 
                    DUCE.CopyBytes((byte*)&data.RadiusX, (byte*)&tempRadiusX, 8);
                    data.hRadiusXAnimations = hRadiusXAnimations; 
                    double tempRadiusY = RadiusY; 
                    DUCE.CopyBytes((byte*)&data.RadiusY, (byte*)&tempRadiusY, 8);
                    data.hRadiusYAnimations = hRadiusYAnimations; 
                    Point tempGradientOrigin = GradientOrigin;
                    DUCE.CopyBytes((byte*)&data.GradientOrigin, (byte*)&tempGradientOrigin, 16);
                    data.hGradientOriginAnimations = hGradientOriginAnimations;
 
                    // NTRAID#Longhorn-1011154-2004/8/12-asecchia GradientStopCollection:  Need to enforce upper-limit of gradient stop capacity
 
                    int count = (vGradientStops == null) ? 0 : vGradientStops.Count; 
                    data.GradientStopsSize = (UInt32)(sizeof(DUCE.MIL_GRADIENTSTOP)*count);
 
                    channel.BeginCommand(
                        (byte*)&data,
                        sizeof(DUCE.MILCMD_RADIALGRADIENTBRUSH),
                        sizeof(DUCE.MIL_GRADIENTSTOP)*count 
                        );
 
                    for (int i=0; i
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