Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / System / Windows / Media / Effects / DropShadowBitmapEffect.cs / 1 / DropShadowBitmapEffect.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2005 // // File: BitmapEffectDropShadow.cs //----------------------------------------------------------------------------- #region Using directives using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; using MS.Internal.PresentationCore; using System.Security; #endregion namespace System.Windows.Media.Effects { ////// The class definition for DropShadowBitmapEffect /// public partial class DropShadowBitmapEffect { ////// Constructor /// public DropShadowBitmapEffect() { } ////// Creates the unmanaged effect handle /// unsafe protected override SafeHandle CreateUnmanagedEffect() { return Create(new Guid(0x459a3fbe, 0xd8ac, 0x4692, 0x87, 0x4b, 0x7a, 0x26, 0x57, 0x15, 0xaa, 0x16)); } ////// /// Update (propagetes) properties to the unmanaged effect /// ////// This method demands permission because effects should not be run /// in partial trust. /// /// SecurityCritical - because SetValue has a link demand /// SecutiryTreatAsSafe - because it demans UIWindow permission /// [SecurityCritical, SecurityTreatAsSafe] protected override void UpdateUnmanagedPropertyState(SafeHandle unmanagedEffect) { SecurityHelper.DemandUIWindowPermission(); BitmapEffect.SetValue(unmanagedEffect, "Color", this.Color); BitmapEffect.SetValue(unmanagedEffect, "ShadowDepth", this.ShadowDepth); BitmapEffect.SetValue(unmanagedEffect, "Direction", this.Direction); BitmapEffect.SetValue(unmanagedEffect, "Noise", this.Noise); BitmapEffect.SetValue(unmanagedEffect, "Opacity", this.Opacity); BitmapEffect.SetValue(unmanagedEffect, "Softness", this.Softness); } ////// An ImageEffect can be used to emulate a DropShadowBitmapEffect with certain restrictions. This /// method returns true when it is possible to emulate the DropShadowBitmapEffect using an ImageEffect. /// internal override bool CanBeEmulatedUsingEffectPipeline() { return (Noise == 0.0); } ////// Returns a ImageEffect that emulates this DropShadowBitmapEffect. /// internal override Effect GetEmulatingEffect() { if (_imageEffectEmulation == null) { _imageEffectEmulation = new DropShadowEffect(); } if (_imageEffectEmulation.Color != Color) { _imageEffectEmulation.Color = Color; } // The limits on ShadowDepth preserve existing behavior. // A scale transform can scale the shadow depth to exceed 50.0, // and this behavior is also handled correctly in the unmanaged layer. if (_imageEffectEmulation.ShadowDepth != ShadowDepth) { if (ShadowDepth >= 50.0) { _imageEffectEmulation.ShadowDepth = 50.0; } else if (ShadowDepth < 0.0) { _imageEffectEmulation.ShadowDepth = 0.0; } else { _imageEffectEmulation.ShadowDepth = ShadowDepth; } } if (_imageEffectEmulation.Direction != Direction) { _imageEffectEmulation.Direction = Direction; } if (_imageEffectEmulation.Opacity != Opacity) { if (Opacity >= 1.0) { _imageEffectEmulation.Opacity = 1.0; } else if (Opacity <= 0.0) { _imageEffectEmulation.Opacity = 0.0; } else { _imageEffectEmulation.Opacity = Opacity; } } if (_imageEffectEmulation.BlurRadius / _MAX_EMULATED_BLUR_RADIUS != Softness) { if (Softness >= 1.0) { _imageEffectEmulation.BlurRadius = _MAX_EMULATED_BLUR_RADIUS; } else if (Softness <= 0.0) { _imageEffectEmulation.BlurRadius = 0.0; } else { _imageEffectEmulation.BlurRadius = _MAX_EMULATED_BLUR_RADIUS * Softness; } } _imageEffectEmulation.RenderingBias = RenderingBias.Performance; return _imageEffectEmulation; } DropShadowEffect _imageEffectEmulation; private const double _MAX_EMULATED_BLUR_RADIUS = 25.0; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2005 // // File: BitmapEffectDropShadow.cs //----------------------------------------------------------------------------- #region Using directives using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; using MS.Internal.PresentationCore; using System.Security; #endregion namespace System.Windows.Media.Effects { ////// The class definition for DropShadowBitmapEffect /// public partial class DropShadowBitmapEffect { ////// Constructor /// public DropShadowBitmapEffect() { } ////// Creates the unmanaged effect handle /// unsafe protected override SafeHandle CreateUnmanagedEffect() { return Create(new Guid(0x459a3fbe, 0xd8ac, 0x4692, 0x87, 0x4b, 0x7a, 0x26, 0x57, 0x15, 0xaa, 0x16)); } ////// /// Update (propagetes) properties to the unmanaged effect /// ////// This method demands permission because effects should not be run /// in partial trust. /// /// SecurityCritical - because SetValue has a link demand /// SecutiryTreatAsSafe - because it demans UIWindow permission /// [SecurityCritical, SecurityTreatAsSafe] protected override void UpdateUnmanagedPropertyState(SafeHandle unmanagedEffect) { SecurityHelper.DemandUIWindowPermission(); BitmapEffect.SetValue(unmanagedEffect, "Color", this.Color); BitmapEffect.SetValue(unmanagedEffect, "ShadowDepth", this.ShadowDepth); BitmapEffect.SetValue(unmanagedEffect, "Direction", this.Direction); BitmapEffect.SetValue(unmanagedEffect, "Noise", this.Noise); BitmapEffect.SetValue(unmanagedEffect, "Opacity", this.Opacity); BitmapEffect.SetValue(unmanagedEffect, "Softness", this.Softness); } ////// An ImageEffect can be used to emulate a DropShadowBitmapEffect with certain restrictions. This /// method returns true when it is possible to emulate the DropShadowBitmapEffect using an ImageEffect. /// internal override bool CanBeEmulatedUsingEffectPipeline() { return (Noise == 0.0); } ////// Returns a ImageEffect that emulates this DropShadowBitmapEffect. /// internal override Effect GetEmulatingEffect() { if (_imageEffectEmulation == null) { _imageEffectEmulation = new DropShadowEffect(); } if (_imageEffectEmulation.Color != Color) { _imageEffectEmulation.Color = Color; } // The limits on ShadowDepth preserve existing behavior. // A scale transform can scale the shadow depth to exceed 50.0, // and this behavior is also handled correctly in the unmanaged layer. if (_imageEffectEmulation.ShadowDepth != ShadowDepth) { if (ShadowDepth >= 50.0) { _imageEffectEmulation.ShadowDepth = 50.0; } else if (ShadowDepth < 0.0) { _imageEffectEmulation.ShadowDepth = 0.0; } else { _imageEffectEmulation.ShadowDepth = ShadowDepth; } } if (_imageEffectEmulation.Direction != Direction) { _imageEffectEmulation.Direction = Direction; } if (_imageEffectEmulation.Opacity != Opacity) { if (Opacity >= 1.0) { _imageEffectEmulation.Opacity = 1.0; } else if (Opacity <= 0.0) { _imageEffectEmulation.Opacity = 0.0; } else { _imageEffectEmulation.Opacity = Opacity; } } if (_imageEffectEmulation.BlurRadius / _MAX_EMULATED_BLUR_RADIUS != Softness) { if (Softness >= 1.0) { _imageEffectEmulation.BlurRadius = _MAX_EMULATED_BLUR_RADIUS; } else if (Softness <= 0.0) { _imageEffectEmulation.BlurRadius = 0.0; } else { _imageEffectEmulation.BlurRadius = _MAX_EMULATED_BLUR_RADIUS * Softness; } } _imageEffectEmulation.RenderingBias = RenderingBias.Performance; return _imageEffectEmulation; } DropShadowEffect _imageEffectEmulation; private const double _MAX_EMULATED_BLUR_RADIUS = 25.0; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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