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CISourceOverCompositing.xml
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CISourceOverCompositing.xml
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<Type Name="CISourceOverCompositing" FullName="CoreImage.CISourceOverCompositing">
<TypeSignature Language="C#" Value="public class CISourceOverCompositing : CoreImage.CICompositingFilter" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit CISourceOverCompositing extends CoreImage.CICompositingFilter" />
<TypeSignature Language="DocId" Value="T:CoreImage.CISourceOverCompositing" />
<TypeSignature Language="F#" Value="type CISourceOverCompositing = class
 inherit CICompositingFilter" />
<AssemblyInfo>
<AssemblyName>Xamarin.iOS</AssemblyName>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>Xamarin.Mac</AssemblyName>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Base>
<BaseTypeName>CoreImage.CICompositingFilter</BaseTypeName>
</Base>
<Interfaces />
<Docs>
<summary>The CISourceOverCompositing CoreImage filter</summary>
<remarks>
<para>The following example shows this filter in use</para>
<example>
<code lang="csharp lang-csharp"><![CDATA[
// Create CIImages from files.
CIImage clouds = CIImage.FromCGImage (UIImage.FromFile ("clouds.jpg").CGImage);
CIImage heron = CIImage.FromCGImage (UIImage.FromFile ("heron.jpg").CGImage);
// Construct the SourceOverComposite filter
var sourceOverComposite = new CISourceOverCompositing() {
Image = heron,
BackgroundImage = clouds
};
// Get the composite image from the filter.
var output = sourceOverComposite.OutputImage;
// To render the results, we need to create a context, and then
// use one of the context rendering APIs, in this case, we render the
// result into a CoreGraphics image, which is merely a useful representation
//
var context = CIContext.FromOptions (null);
var cgimage = context.CreateCGImage (output, output.Extent);
// The above cgimage can be added to a screen view, for example, this
// would add it to a UIImageView on the screen:
myImageView.Image = UIImage.FromImage (cgimage);
]]></code>
</example>
<para>
With the following source:
</para>
<para>
<img href="~/CoreImage/_images/heron.jpg" alt="Photograph of a heron." />
</para>
<para>
<img href="~/CoreImage/_images/clouds.jpg" alt="Photograph of clouds and sunbeams." />
</para>
<para>
Produces the following output:
</para>
<para>
<img href="~/CoreImage/_images/SourceOver.png" alt="Result of applying the filter." />
</para>
<para>
"Sunrise near Atkeison Plateau" © 2012 Charles Atkeison, used under a Creative Commons Attribution-ShareAlike license: https://creativecommons.org/licenses/by-sa/3.0/
"canon" © 2012 cuatrok77 hernandez, used under a Creative Commons Attribution-ShareAlike license: https://creativecommons.org/licenses/by-sa/3.0/
</para>
</remarks>
<related type="sample" href="https://github.com/xamarin/ios-samples/tree/master/CoreImage">Core Image</related>
</Docs>
<Members>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public CISourceOverCompositing ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:CoreImage.CISourceOverCompositing.#ctor" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
<AssemblyName>Xamarin.iOS</AssemblyName>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>Xamarin.Mac</AssemblyName>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>ObjCRuntime.BindingImpl(ObjCRuntime.BindingImplOptions.GeneratedCode | ObjCRuntime.BindingImplOptions.Optimizable)</AttributeName>
</Attribute>
</Attributes>
<Parameters />
<Docs>
<summary>Creates an instance of the CISourceOverCompositing image filter</summary>
<remarks>You can customize the behavior of this filter by setting the properties of this object before you run the CIContext pipeline. You must at least set the Image property to be the input image for this filter</remarks>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public CISourceOverCompositing (Foundation.NSCoder coder);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class Foundation.NSCoder coder) cil managed" />
<MemberSignature Language="DocId" Value="M:CoreImage.CISourceOverCompositing.#ctor(Foundation.NSCoder)" />
<MemberSignature Language="F#" Value="new CoreImage.CISourceOverCompositing : Foundation.NSCoder -> CoreImage.CISourceOverCompositing" Usage="new CoreImage.CISourceOverCompositing coder" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
<AssemblyName>Xamarin.iOS</AssemblyName>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>Xamarin.Mac</AssemblyName>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>Foundation.Export("initWithCoder:")</AttributeName>
</Attribute>
<Attribute>
<AttributeName>ObjCRuntime.BindingImpl(ObjCRuntime.BindingImplOptions.GeneratedCode | ObjCRuntime.BindingImplOptions.Optimizable)</AttributeName>
</Attribute>
<Attribute>
<AttributeName>System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Advanced)</AttributeName>
</Attribute>
</Attributes>
<Parameters>
<Parameter Name="coder" Type="Foundation.NSCoder" />
</Parameters>
<Docs>
<param name="coder">The unarchiver object.</param>
<summary>A constructor that initializes the object from the data stored in the unarchiver object.</summary>
<remarks>
<para>This constructor is provided to allow the class to be initialized from an unarchiver (for example, during NIB deserialization). This is part of the <see cref="T:Foundation.NSCoding" /> protocol.</para>
<para>If developers want to create a subclass of this object and continue to support deserialization from an archive, they should implement a constructor with an identical signature: taking a single parameter of type <see cref="T:Foundation.NSCoder" /> and decorate it with the [Export("initWithCoder:"] attribute declaration.</para>
<para>The state of this object can also be serialized by using the companion method, EncodeTo.</para>
</remarks>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="protected CISourceOverCompositing (Foundation.NSObjectFlag t);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig specialname rtspecialname instance void .ctor(class Foundation.NSObjectFlag t) cil managed" />
<MemberSignature Language="DocId" Value="M:CoreImage.CISourceOverCompositing.#ctor(Foundation.NSObjectFlag)" />
<MemberSignature Language="F#" Value="new CoreImage.CISourceOverCompositing : Foundation.NSObjectFlag -> CoreImage.CISourceOverCompositing" Usage="new CoreImage.CISourceOverCompositing t" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
<AssemblyName>Xamarin.iOS</AssemblyName>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>Xamarin.Mac</AssemblyName>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>ObjCRuntime.BindingImpl(ObjCRuntime.BindingImplOptions.GeneratedCode | ObjCRuntime.BindingImplOptions.Optimizable)</AttributeName>
</Attribute>
<Attribute>
<AttributeName>System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Advanced)</AttributeName>
</Attribute>
</Attributes>
<Parameters>
<Parameter Name="t" Type="Foundation.NSObjectFlag" />
</Parameters>
<Docs>
<param name="t">Unused sentinel value, pass NSObjectFlag.Empty.</param>
<summary>Constructor to call on derived classes to skip initialization and merely allocate the object.</summary>
<remarks>
<para>This constructor should be called by derived classes when they completely construct the object in managed code and merely want the runtime to allocate and initialize the NSObject. This is required to implement the two-step initialization process that Objective-C uses, the first step is to perform the object allocation, the second step is to initialize the object. When developers invoke the constructor that takes the NSObjectFlag.Empty they take advantage of a direct path that goes all the way up to NSObject to merely allocate the object's memory and bind the Objective-C and C# objects together. The actual initialization of the object is up to the developer.</para>
<para>This constructor is typically used by the binding generator to allocate the object, but prevent the actual initialization to take place. Once the allocation has taken place, the constructor has to initialize the object. With constructors generated by the binding generator this means that it manually invokes one of the "init" methods to initialize the object.</para>
<para>It is the developer's responsibility to completely initialize the object if they chain up using the NSObjectFlag.Empty path.</para>
<para>In general, if the developer's constructor invokes the NSObjectFlag.Empty base implementation, then it should be calling an Objective-C init method. If this is not the case, developers should instead chain to the proper constructor in their class. </para>
<para>The argument value is ignored and merely ensures that the only code that is executed is the construction phase is the basic NSObject allocation and runtime type registration. Typically the chaining would look like this:</para>
<example>
<code lang="csharp lang-csharp"><![CDATA[
//
// The NSObjectFlag merely allocates the object and registers the
// C# class with the Objective-C runtime if necessary, but no actual
// initXxx method is invoked, that is done later in the constructor
//
// This is taken from Xamarin.iOS's source code:
//
[Export ("initWithFrame:")]
public UIView (System.Drawing.RectangleF frame) : base (NSObjectFlag.Empty)
{
// Invoke the init method now.
var initWithFrame = new Selector ("initWithFrame:").Handle;
if (IsDirectBinding)
Handle = ObjCRuntime.Messaging.IntPtr_objc_msgSend_CGRect (this.Handle, initWithFrame, frame);
else
Handle = ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper_CGRect (this.SuperHandle, initWithFrame, frame);
}
]]></code>
</example>
</remarks>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public CISourceOverCompositing (IntPtr handle);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(native int handle) cil managed" />
<MemberSignature Language="DocId" Value="M:CoreImage.CISourceOverCompositing.#ctor(System.IntPtr)" />
<MemberSignature Language="F#" Value="new CoreImage.CISourceOverCompositing : nativeint -> CoreImage.CISourceOverCompositing" Usage="new CoreImage.CISourceOverCompositing handle" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
<AssemblyName>Xamarin.iOS</AssemblyName>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>Xamarin.Mac</AssemblyName>
<AssemblyVersion>0.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>ObjCRuntime.BindingImpl(ObjCRuntime.BindingImplOptions.GeneratedCode | ObjCRuntime.BindingImplOptions.Optimizable)</AttributeName>
</Attribute>
</Attributes>
<Parameters>
<Parameter Name="handle" Type="System.IntPtr" />
</Parameters>
<Docs>
<param name="handle">Pointer (handle) to the unmanaged object.</param>
<summary>A constructor used when creating managed representations of unmanaged objects; Called by the runtime.</summary>
<remarks>
<para>This constructor is invoked by the runtime infrastructure (<see cref="M:ObjCRuntime.Runtime.GetNSObject(System.IntPtr)" />) to create a new managed representation for a pointer to an unmanaged Objective-C object. Developers should not invoke this method directly, instead they should call the GetNSObject method as it will prevent two instances of a managed object to point to the same native object.</para>
</remarks>
</Docs>
</Member>
</Members>
</Type>