Статья
11/17/2011

PixelShader Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Provides a managed wrapper around a High Level Shading Language (HLSL) pixel shader.

Inheritance Hierarchy

System.Object
System.Windows.DependencyObject
System.Windows.Media.Effects.PixelShader

Namespace: System.Windows.Media.Effects
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public NotInheritable Class PixelShader _
    Inherits DependencyObject

public sealed class PixelShader : DependencyObject

The PixelShader type exposes the following members.

Constructors

	Name	Description
	PixelShader	Initializes a new instance of the PixelShader class.

Top

Properties

	Name	Description
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	UriSource	Gets or sets a URI reference to HLSL bytecode in the assembly.

Top

Methods

	Name	Description
	CheckAccess	Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
	ClearValue	Clears the local value of a dependency property. (Inherited from DependencyObject.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetAnimationBaseValue	Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValue	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ReadLocalValue	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
	SetValue	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Top

Fields

	Name	Description
	UriSourceProperty	Identifies the UriSource dependency property.

Top

Remarks

Use the PixelShader class to access precompiled HLSL bytecode in a Silverlight application.

Set the UriSource property to load the shader bytecode.

To create a custom effect, assign the PixelShader to the PixelShader property of a ShaderEffect.

Examples

The following example shows an image with and without a shader effect applied to it.

Run this sample

This "invert colors" effect is a custom shader effect. To create your own effect, do the following:

Create a shader using High Level Shader Language (HLSL), part of the DirectX SDK, and compile into a .ps file. To compile .ps files, you can directly use the fxc command line tool provided with the DirectX SDK or another tool like Shazzam which gives you a convenient UI for working with the fxc command line tool.
Derive your custom effect from the ShaderEffect class and set the PixelShader property of your custom shader effect to your .ps file.

using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Effects;
using System;

namespace PixelShaderSample
{

    public class MyPixelInvertedEffect : ShaderEffect
    {

        public MyPixelInvertedEffect()
        {

            // Include your project name and .ps file.
            Uri u = new Uri(@"/PixelShaderSample;component/InvertColors.ps", UriKind.Relative);

            // Set the PixelShader of the custom shader effect to use your custom .ps file.
            PixelShader myPixelShader = new PixelShader();
            myPixelShader.UriSource = u;
            this.PixelShader = myPixelShader;

        }
    }
}

3. Apply the custom shader effect to your object (in this case an Image).

    <UserControl x:Class="PixelShaderSample.MainPage"
    xmlns:shader="clr-namespace:PixelShaderSample"
    xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml" 
    Width="400" Height="300">
    <StackPanel Orientation="Horizontal">

        <!-- Image without PixelShader effect on the left and image with
             custom shader on the right. -->
        <Image Height="200" Width="200" Source="tree_blossoms.jpg" Stretch="Fill"/>
        <Image Height="200" Width="200" Source="tree_blossoms.jpg" Stretch="Fill">
            <Image.Effect>
                <shader:MyPixelInvertedEffect />
            </Image.Effect>
        </Image>
    </StackPanel>
</UserControl>

Version Information

Silverlight

Supported in: 5, 4, 3

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Поделиться через