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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta content="text/html; charset=UTF-8" http-equiv="content-type"></meta>
<title>SVG Filters 1.2, Part 2: Language</title>
<link rel="stylesheet" type="text/css" href="style/svg-style.css"/>
<link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-WD"/>
</head>
<body>
<div class="head">
<p><a href="http://www.w3.org/"><img width="72" alt="W3C" src="http://www.w3.org/Icons/w3c_home" height="48"></img></a></p>
<h1>SVG Filters 1.2, Part 2: Language</h1>
<h2 id="pagesubtitle"> W3C Working Draft 01 May 2007</h2>
<dl>
<dt>This version:</dt>
<dd><a href="http://www.w3.org/TR/2007/WD-SVGFilter12-20070501/">http://www.w3.org/TR/2007/WD-SVGFilter12-20070501/</a></dd>
<dt>Latest version:</dt>
<dd><a href="http://www.w3.org/TR/SVGFilter12">http://www.w3.org/TR/SVGFilter12</a></dd>
<dt>Editors:</dt>
<dd>Erik Dahlström, Opera Software ASA <<a href="mailto:ed@opera.com">ed@opera.com</a>></dd>
<dt>Authors:</dt>
<dd>The authors of this specification are the participants of the W3C SVG Working Group.</dd>
</dl>
<p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2007 <a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>®</sup> (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>, <a href="http://www.ercim.org/"><acronym title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym></a>, <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.</p>
</div>
<hr title="Separator from Header"></hr>
<h2 id="abstract"> Abstract</h2>
<p>
SVG is language for describing vector graphics, however it's typically rendered on raster displays. SVG filter effects is a way of processing the generated raster image before it's displayed.
</p>
<p>Although originally designed for use in SVG, filter effects are defined in XML and are accessed via a presentation property, and therefore could be used in other environments, such as HTML styled with CSS and XSL:FO.
</p>
<p>
This document defines the markup used by SVG filters.
</p>
<h2 id="status"> Status of This Document</h2>
<p><em>This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/">W3C technical reports index</a> at http://www.w3.org/TR/.</em></p>
<p>This document is the First Public Working Draft of this specification.
There is an accompanying <a href="/TR/2007/WD-SVGFilterPrimer12-20070501">SVG Filters 1.2, Part
1: Primer</a> that lists the ways SVG filters may be used. </p>
<p>
This document has been produced by the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG Working Group</a> as
part of the W3C <a href="http://www.w3.org/Graphics/Activity">Graphics Activity</a> within the
<a href="http://www.w3.org/Interaction/">Interaction Domain</a>. The Working Group expects to advance this Working Draft to Recommendation Status.
</p>
<p>We explicitly invite comments on this specification. Please send them to <a href="mailto:www-svg@w3.org">www-svg@w3.org</a>: the public email list for
issues related to vector graphics on the Web (<a href="http://lists.w3.org/Archives/Public/www-svg/">archives</a>). Acceptance
of the archiving policy is requested automatically upon first post to the
list. To subscribe send an email to
<a href="mailto:www-svg-request@w3.org">www-svg-request@w3.org</a> with
the word subscribe in the subject line. </p>
<p>This document was produced by a group operating under the
<a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5
February 2004 <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>.
<acronym title="World Wide Web Consortium">W3C</acronym> maintains a <a href="http://www.w3.org/2004/01/pp-impl/19480/status" rel="disclosure">public list of any
patent disclosures</a> made in connection with the
deliverables of the group; that page also includes
instructions for disclosing a patent.
An individual who has actual knowledge of a patent which the
individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the
information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>.</p>
<p>
Publication as a Working Draft does not imply endorsement by the <acronym title="World Wide Web Consortium">W3C</acronym> Membership.
This is a draft document and may be updated, replaced or obsoleted by other
documents at any time. It is inappropriate to cite this document as other than
work in progress.
</p>
<hr></hr>
<h2 id="howto"> How to read this document and give feedback</h2>
<p>This draft of SVG Filters is essentially the filter chapter from <a href="#ref-svg11">SVG 1.1</a>. One of the goals is that this specification
can be re-used more easily by other specifications that want to have filter
effects. Some things that have been changed are: error handling is more
similar to SVG Tiny 1.2, the addition of a <a href="#feDropShadowElement"><span class="element-name">'feDropShadow'</span></a> filter primitive and the
possibility to filter bitmap data with the DOM. </p>
<p>
Sections have been marked with green sidebars if it's new since SVG 1.1, and in blue if it's been changed since SVG 1.1.
</p>
<p>The main purpose of this document is to encourage public feedback. The
best way to give feedback is by sending an email to <a href="mailto:public-svg-filters@w3.org">public-svg-filters@w3.org</a>. Please
include some kind of keyword that identifies the area of the specification
the comment is referring to in the subject line of your message (e.g "Section
X.Y - the 'filter' property" or "Filtering primitive handling"). If you have
comments on multiple areas of this document, then it is probably best to
split those comments into multiple messages. </p>
<p>The public are welcome to comment on any aspect in this document, but
there are a few areas in which the SVG Working Group are explicitly
requesting feedback. These areas are noted in place within this document.
There is also a specific area related to the specification that is listed
here: </p>
<h2 id="toc">Table of Contents</h2>
<ul class="toc">
<li>1 <a href="#introduction">Introduction</a>
</li>
<li>2 <a href="#FilterElement">The 'filter'element</a>
</li>
<li>3 <a href="#FilterProperty">The 'filter'property</a>
</li>
<li>4 <a href="#FilterEffectsRegion">Filter effects region</a>
<ul class="toc">
<li>4.1 <a href="#filter-margins">Filter Region extensions</a>
</li>
</ul>
</li>
<li>5 <a href="#AccessBackgroundImage">Accessing the background image</a>
<ul class="toc">
<li>5.1 <a href="#AccessBackgroundImageSVG">Accessing the background image in SVG</a>
</li>
</ul>
</li>
<li>6 <a href="#FilterPrimitivesOverview">Filter primitives overview</a>
<ul class="toc">
<li>6.1 <a href="#FilterPrimitivesOverviewIntro">Overview</a>
</li>
<li>6.2 <a href="#CommonAttributes">Common attributes</a>
</li>
<li>6.3 <a href="#FilterPrimitiveSubRegion">Filter primitive subregion</a>
</li>
</ul>
</li>
<li>7 <a href="#LightSourceDefinitions">Light source elements and properties</a>
<ul class="toc">
<li>7.1 <a href="#LightSourceIntro">Introduction</a>
</li>
<li>7.2 <a href="#feDistantLightElement">Light source 'feDistantLight'</a>
</li>
<li>7.3 <a href="#fePointLightElement">Light source 'fePointLight'</a>
</li>
<li>7.4 <a href="#feSpotLightElement">Light source 'feSpotLight'</a>
</li>
<li>7.5 <a href="#LightingColorProperty">The 'lighting-color' property</a>
</li>
</ul>
</li>
<li>8 <a href="#feBlendElement">Filter primitive 'feBlend'</a>
</li>
<li>9 <a href="#feColorMatrixElement">Filter primitive 'feColorMatrix'</a>
</li>
<li>10 <a href="#feComponentTransferElement">Filter primitive 'feComponentTransfer'</a>
</li>
<li>11 <a href="#feCompositeElement">Filter primitive 'feComposite'</a>
</li>
<li>12 <a href="#feConvolveMatrixElement">Filter primitive 'feConvolveMatrix'</a>
</li>
<li>13 <a href="#feDiffuseLightingElement">Filter primitive 'feDiffuseLighting'</a>
</li>
<li>14 <a href="#feDisplacementMapElement">Filter primitive 'feDisplacementMap'</a>
</li>
<li>15 <a href="#feFloodElement">Filter primitive 'feFlood'</a>
</li>
<li>16 <a href="#feGaussianBlurElement">Filter primitive 'feGaussianBlur'</a>
</li>
<li>17 <a href="#feImageElement">Filter primitive 'feImage'</a>
</li>
<li>18 <a href="#feMergeElement">Filter primitive 'feMerge'</a>
</li>
<li>19 <a href="#feMorphologyElement">Filter primitive 'feMorphology'</a>
</li>
<li>20 <a href="#feOffsetElement">Filter primitive 'feOffset'</a>
</li>
<li>21 <a href="#feSpecularLightingElement">Filter primitive 'feSpecularLighting'</a>
</li>
<li>22 <a href="#feTileElement">Filter primitive 'feTile'</a>
</li>
<li>23 <a href="#feTurbulenceElement">Filter primitive 'feTurbulence'</a>
</li>
<li>24 <a href="#feDropShadowElement">Filter primitive 'feDropShadow'</a>
</li>
<li>25 <a href="#feDiffuseSpecularElement">Filter primitive 'feDiffuseSpecular'</a>
</li>
<li>26 <a href="#feCustomElement">Filter primitive 'feCustom'</a>
</li>
<li>27 <a href="#RelaxNG">RelaxNG Schema for SVG Filters 1.2</a>
</li>
<li>28 <a href="#DOMInterfaces">DOM interfaces</a>
<ul class="toc">
<li>28.1 <a href="#InterfaceImageData">Interface ImageData</a>
</li>
<li>28.2 <a href="#InterfaceSVGFilterElement">Interface SVGFilterElement</a>
</li>
<li>28.3 <a href="#InterfaceSVGFilterPrimitiveStandardAttributes">Interface SVGFilterPrimitiveStandardAttributes</a>
</li>
<li>28.4 <a href="#InterfaceSVGFEBlendElement">Interface SVGFEBlendElement</a>
</li>
<li>28.5 <a href="#InterfaceSVGFEColorMatrixElement">Interface SVGFEColorMatrixElement</a>
</li>
<li>28.6 <a href="#InterfaceSVGFEComponentTransferElement">Interface SVGFEComponentTransferElement</a>
</li>
<li>28.7 <a href="#InterfaceSVGComponentTransferFunctionElement">Interface SVGComponentTransferFunctionElement</a>
</li>
<li>28.8 <a href="#InterfaceSVGFEFuncRElement">Interface SVGFEFuncRElement</a>
</li>
<li>28.9 <a href="#InterfaceSVGFEFuncGElement">Interface SVGFEFuncGElement</a>
</li>
<li>28.10 <a href="#InterfaceSVGFEFuncBElement">Interface SVGFEFuncBElement</a>
</li>
<li>28.11 <a href="#InterfaceSVGFEFuncAElement">Interface SVGFEFuncAElement</a>
</li>
<li>28.12 <a href="#InterfaceSVGFECompositeElement">Interface SVGFECompositeElement</a>
</li>
<li>28.13 <a href="#InterfaceSVGFEConvolveMatrixElement">Interface SVGFEConvolveMatrixElement</a>
</li>
<li>28.14 <a href="#InterfaceSVGFEDiffuseLightingElement">Interface SVGFEDiffuseLightingElement</a>
</li>
<li>28.15 <a href="#InterfaceSVGFEDistantLightElement">Interface SVGFEDistantLightElement</a>
</li>
<li>28.16 <a href="#InterfaceSVGFEPointLightElement">Interface SVGFEPointLightElement</a>
</li>
<li>28.17 <a href="#InterfaceSVGFESpotLightElement">Interface SVGFESpotLightElement</a>
</li>
<li>28.18 <a href="#InterfaceSVGFEDisplacementMapElement">Interface SVGFEDisplacementMapElement</a>
</li>
<li>28.19 <a href="#InterfaceSVGFEFloodElement">Interface SVGFEFloodElement</a>
</li>
<li>28.20 <a href="#InterfaceSVGFEGaussianBlurElement">Interface SVGFEGaussianBlurElement</a>
</li>
<li>28.21 <a href="#InterfaceSVGFEImageElement">Interface SVGFEImageElement</a>
</li>
<li>28.22 <a href="#InterfaceSVGFEMergeElement">Interface SVGFEMergeElement</a>
</li>
<li>28.23 <a href="#InterfaceSVGFEMergeNodeElement">Interface SVGFEMergeNodeElement</a>
</li>
<li>28.24 <a href="#InterfaceSVGFEMorphologyElement">Interface SVGFEMorphologyElement</a>
</li>
<li>28.25 <a href="#InterfaceSVGFEOffsetElement">Interface SVGFEOffsetElement</a>
</li>
<li>28.26 <a href="#InterfaceSVGFESpecularLightingElement">Interface SVGFESpecularLightingElement</a>
</li>
<li>28.27 <a href="#InterfaceSVGFETileElement">Interface SVGFETileElement</a>
</li>
<li>28.28 <a href="#InterfaceSVGFETurbulenceElement">Interface SVGFETurbulenceElement</a>
</li>
<li>28.29 <a href="#InterfaceSVGFEDropShadowElement">Interface SVGFEDropShadowElement</a>
</li>
</ul>
</li>
<li>29 <a href="#references1">References</a>
<ul class="toc">
<li>29.1 <a href="#normref">Normative References</a>
</li>
<li>29.2 <a href="#informref">Informative References</a>
</li>
</ul>
</li>
</ul>
<h2 id="introduction">1 Introduction</h2>
<p>This chapter describes a declarative filter effects feature set, which
when combined with the other web technologies, like SVG or HTML, can describe
much of the common artwork on the Web in such a way that client-side
generation and alteration can be performed easily. In addition, the ability
to apply filter effects to SVG <a href="/TR/SVGMobile12/intro.html#TermGraphicsElement">graphics elements</a> and <a href="/TR/SVGMobile12/intro.html#TermContainerElement">container elements</a> helps to
maintain the semantic structure of the document, instead of resorting to
images which aside from generally being a fixed resolution tend to obscure
the original semantics of the elements they replace. This is especially true
for effects applied to text. The various usage scenarios are listed in the
SVG Filters Requirements document. </p>
<p>Note that even though this specification references parts of <a href="#ref-svg11">SVG 1.1</a> it does not require a complete SVG 1.1
implementation. </p>
<p>This document is normative. </p>
<p>This document contains explicit conformance criteria that overlap with
some RNG definitions in requirements. If there is any conflict between the
two, the explicit conformance criteria are the definitive reference. </p>
<p>A filter effect consists of a series of graphics operations that are
applied to a given <a id="TermSourceGraphic" name="TermSourceGraphic"><span class="SVG-Term">source graphic</span></a> to produce a modified graphical
result. The result of the filter effect is rendered to the target device
instead of the original source graphic. The following illustrates the
process:</p>
<div id="AnExample"><p><img src="examples/filters00.png" alt="Image showing source graphic transformed by filter effect" height="78" width="401"></img></p>
<p class="view-as-svg"><a href="examples/filters00.svg">View this example as
SVG (SVG-enabled browsers only)</a><br></br>
</p></div>
<h2 id="FilterElement">2 The <span class="element-name">'filter'</span>
element</h2>
<p>The description of the <span class="element-name">'filter'</span> element
follows:</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="FilterElementFilterUnitsAttribute" name="FilterElementFilterUnitsAttribute"></a> <span class="adef">filterUnits</span> = "<em>userSpaceOnUse</em> |
<em>objectBoundingBox</em>"</dt>
<dd>See <a href="#FilterEffectsRegion">Filter effects region</a>.</dd>
<dt><a id="FilterElementPrimitiveUnitsAttribute" name="FilterElementPrimitiveUnitsAttribute"></a> <span class="adef">primitiveUnits</span> = "<em>userSpaceOnUse</em> |
<em>objectBoundingBox</em>"</dt>
<dd>Specifies the coordinate system for the various length values within
the filter primitives and for the attributes that define the <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
If <strong>primitiveUnits="userSpaceOnUse"</strong>, any length values
within the filter definitions represent values in the current user
coordinate system in place at the time when the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element is referenced (i.e., the user coordinate system for the element
referencing the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element via a <a href="#FilterProperty"><span class="prop-name">'filter'</span></a>
property).<br></br>
If <strong>primitiveUnits="objectBoundingBox"</strong>, then any length
values within the filter definitions represent fractions or percentages
of the bounding box on the referencing element (see Object bounding box
units
).<br></br>
If attribute <span class="attr-name">primitiveUnits</span> is not
specified, then the effect is as if a value of <span class="attr-value">userSpaceOnUse</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
<div class="new">
<dl>
<dt><a id="FilterElementFilterMarginUnitsAttribute" name="FilterElementFilterMarginUnitsAttribute"></a> <span class="adef">filterMarginUnits</span> = "<em>userSpaceOnUse</em> |
<em>objectBoundingBox</em>"</dt>
<dd>See <a href="#FilterEffectsRegion">Filter effects region</a>.</dd>
<dt><a id="FilterElementPrimitiveMarginUnitsAttribute" name="FilterElementPrimitiveMarginUnitsAttribute"></a> <span class="adef">primitiveMarginUnits</span> = "<em>userSpaceOnUse</em> |
<em>objectBoundingBox</em>"</dt>
<dd>Specifies the coordinate system for the margin attributes within the
filter primitives which is used for determining the <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
If <strong>primitiveMarginUnits="userSpaceOnUse"</strong>, any margin
attribute values within the filter definitions represent values in the
current user coordinate system in place at the time when the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element is referenced (i.e., the user coordinate system for the element
referencing the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element via a <a href="#FilterProperty"><span class="prop-name">'filter'</span></a>
property).<br></br>
If <strong>primitiveMarginUnits="objectBoundingBox"</strong>, then any
margin attribute values within the filter definitions represent
fractions or percentages of the bounding box on the referencing element
(see Object bounding box units
).<br></br>
If attribute <span class="attr-name">primitiveMarginUnits</span> is
not specified, then the effect is as if a value of <span class="attr-value">userSpaceOnUse</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<dl>
<dt><a id="FilterElementXAttribute" name="FilterElementXAttribute"></a>
<span class="adef">x</span> = "<em><coordinate></em>"</dt>
<dd>See <a href="#FilterEffectsRegion">Filter effects region</a>.</dd>
<dt><a id="FilterElementYAttribute" name="FilterElementYAttribute"></a>
<span class="adef">y</span> = "<em><coordinate></em>"</dt>
<dd>See <a href="#FilterEffectsRegion">Filter effects region</a>.</dd>
<dt><a id="FilterElementWidthAttribute" name="FilterElementWidthAttribute"></a> <span class="adef">width</span> =
"<em><length></em>"</dt>
<dd>See <a href="#FilterEffectsRegion">Filter effects region</a>.</dd>
<dt><a id="FilterElementHeightAttribute" name="FilterElementHeightAttribute"></a> <span class="adef">height</span> =
"<em><length></em>"</dt>
<dd>See <a href="#FilterEffectsRegion">Filter effects region</a>.</dd>
</dl>
<div class="new">
<dl>
<dt><a class="indexref-filter_primitives_common_attributes::mx#Q#_attribute" id="FilterElementMxAttribute" name="FilterElementMxAttribute"></a>
<span class="adef">mx</span> = "<em><coordinate></em>"</dt>
<dd>The margin delta for the x coordinate of the subregion which
restricts calculation and rendering of the given filter primitive. If
this attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::my#Q#_attribute" id="FilterElementMyAttribute" name="FilterElementMyAttribute"></a>
<span class="adef">my</span> = "<em><coordinate></em>"</dt>
<dd>The margin delta for the y coordinate of the subregion which
restricts calculation and rendering of the given filter primitive. If
this attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>. <br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::mw#Q#_attribute" id="FilterElementMwAttribute" name="FilterElementMwAttribute"></a>
<span class="adef">mw</span> = "<em><length></em>"</dt>
<dd>The margin delta for the width of the subregion which restricts
calculation and rendering of the given filter primitive. If this
attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::mh#Q#_attribute" id="FilterElementMhAttribute" name="FilterElementMhAttribute"></a>
<span class="adef">mh</span> = "<em><length></em>"</dt>
<dd>The margin delta for the height of the subregion which restricts
calculation and rendering of the given filter primitive. If this
attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<dl>
<dt><a id="FilterElementFilterResAttribute" name="FilterElementFilterResAttribute"></a> <span class="adef">filterRes</span> = "<em><number-optional-number></em>"
</dt>
<dd>See <a href="#FilterEffectsRegion">Filter effects region</a>.</dd>
</dl>
<div class="changed">
<dl>
<dt>
<a id="FilterElementHrefAttribute" name="FilterElementHrefAttribute"></a> <span class="adef">xlink:href</span>
= "<span class="attr-value"><XMLRI></span>"</dt>
<dd><p>A URI reference
to another <span class="element-name">'filter'</span> element within
the current SVG document fragment. Any attributes which are defined on
the referenced <span class="element-name">'filter'</span> element which
are not defined on this element are inherited by this element. If this
element has no defined filter nodes, and the referenced element has
defined filter nodes (possibly due to its own <span class="attr-name">href</span> attribute), then this element inherits
the filter nodes defined from the referenced <span class="element-name">'filter'</span> element. Inheritance can be
indirect to an arbitrary level; thus, if the referenced <span class="element-name">'filter'</span> element inherits attributes or its
filter node specification due to its own <span class="attr-name">href</span> attribute, then the current element can
inherit those attributes or filter node specifications.</p>
<div class="note">
This attribute is deprecated and should not be used, it's included for
backwards compatibility reasons only.</div>
<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
</div>
<p>Properties inherit into the <span class="element-name">'filter'</span>
element from its ancestors; properties do <em>not</em> inherit from the
element referencing the <span class="element-name">'filter'</span>
element.</p>
<p><span class="element-name">'filter'</span> elements are never rendered
directly; their only usage is as something that can be referenced using the
<a href="#FilterProperty"><span class="prop-name">'filter'</span></a>
property. The <span class="prop-name">'display'</span> property does not
apply to the <span class="element-name">'filter'</span> element; thus, <span class="element-name">'filter'</span> elements are not directly rendered even
if the <span class="prop-name">'display'</span> property is set to a value
other than <span class="prop-value">none</span>, and <span class="element-name">'filter'</span> elements are available for referencing
even when the <span class="prop-name">'display'</span> property on the <span class="element-name">'filter'</span> element or any of its ancestors is set
to <span class="prop-value">none</span>.</p>
<br></br>
<h2 id="FilterProperty">3 The <span class="prop-name">'filter'</span>
property</h2>
<p>The description of the <span class="prop-name">'filter'</span> property is
as follows:</p>
<div class="changed">
<div class="propdef">
<dl>
<dt><span class="index-def" title="'margin-top'"><a class="propdef-title" id="propdef-filter" name="propdef-filter"><span class="prop-name">'filter'</span></a></span></dt>
<dd>
<table cellpadding="0" cellspacing="0" class="propinfo" summary="filter property">
<tbody>
<tr valign="baseline">
<td><em>Value:</em> </td>
<td><FuncXMLRI> | none | <a href="http://www.w3.org/TR/REC-CSS2/cascade.html#value-def-inherit" class="noxref"><span class="value-inst-inherit noxref">inherit</span></a></td>
</tr>
<tr valign="baseline">
<td><em>Initial:</em> </td>
<td>none</td>
</tr>
<tr valign="baseline">
<td><em>Applies to:</em> </td>
<td>All elements that render. The host language is resposible for
stating which elements render.
For svg: container elements
and graphics elements
.</td>
</tr>
<tr valign="baseline">
<td><em>Inherited:</em> </td>
<td>no</td>
</tr>
<tr valign="baseline">
<td><em>Percentages:</em> </td>
<td>N/A</td>
</tr>
<tr valign="baseline">
<td><em>Media:</em> </td>
<td>visual</td>
</tr>
<tr valign="baseline">
<td><em>Animatable:</em> </td>
<td>yes</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</div>
</div>
<dl>
<dt><span class="prop-value"><FuncXMLRI></span></dt>
<dd>An IRI reference
to a <a href="#FilterElement"><span class="element-name">'filter'</span></a> element which defines the
filter effects that shall be applied to this element.
</dd>
<dt><span class="prop-value">none</span></dt>
<dd>Do not apply any filter effects to this element.</dd>
</dl>
<br></br>
<h2 id="FilterEffectsRegion">4 Filter effects region</h2>
<p>A <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element can define a region on the canvas to which a given filter effect
applies and can provide a resolution for any intermediate continuous tone
images used to process any raster-based filter primitives. </p>
<div class="new">
<h3 id="filter-margins">4.1 Filter Region extensions</h3>
<p>In <a href="#ref-svg11">SVG 1.1</a>, a <span class="element">filter</span>
defines the area upon which it applies. This makes it difficult to develop a
generic filter that can be applied to arbitrary graphics, since the filter
must define a large enough area to cover any graphical object to which it is
applied. An example of this is a generic "drop shadow" filter, which is
commonly specified as a combination of a Gaussian blur <a href="#feGaussianBlurElement"><span class="element-name">feGuassianBlur</span></a>) that is offset <a href="#feOffsetElement"><span class="element-name">feOffset</span></a>) and then composed <a href="#feCompositeElement"><span class="element-name">feComposite</span></a>) with the original source graphic.
Since the shadow has to extend beyond the original graphic's boundaries, the
filter must be defined to have a larger area than the original graphic.
Overestimating this margin has a negative effect on performance, since the
complex filter operation has to touch a larger amount of user space (ie.
pixels). </p>
<p>In order to solve this problem this spec allows additional control over
the filter region. The outer filter region is expressed by delta to the
<a href="#FilterElementXAttribute"><span class="attr-name">x</span></a>,
<a href="#FilterElementYAttribute"><span class="attr-name">y</span></a>,
<a href="#FilterElementWidthAttribute"><span class="attr-name">width</span></a>,
<a href="#FilterElementHeightAttribute"><span class="attr-name">height</span></a>
of the input filter region. </p>
<p>In particular, the <a href="#FilterElementFilterMarginUnitsAttribute"><span class="attr-name">filterMarginUnits</span></a>, <a href="#FilterElementPrimitiveMarginUnitsAttribute"><span class="attr-name">primitiveMarginUnits</span></a>, <a href="#FilterElementMxAttribute"><span class="attr-name">mx</span></a>, <a href="#FilterElementMyAttribute"><span class="attr-name">my</span></a>, <a href="#FilterElementMwAttribute"><span class="attr-name">mw</span></a> and <a href="#FilterElementMhAttribute"><span class="attr-name">mh</span></a> are
added to the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element. The <span class="attr-name">filterMarginUnits</span> specifies the coordinate space of
the new margin attributes, which are used to increase or decrease the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element's
<a href="#FilterElementXAttribute"><span class="attr-name">x</span></a>,
<a href="#FilterElementYAttribute"><span class="attr-name">y</span></a>,
<a href="#FilterElementWidthAttribute"><span class="attr-name">width</span></a> and
<a href="#FilterElementHeightAttribute"><span class="attr-name">height</span></a>
attributes (once they have been calculated). The <a href="#FilterElementPrimitiveMarginUnitsAttribute"><span class="attr-name">primitiveMarginUnits</span></a> specifies the units for the
new margin attributes on the filter primitives, also named
<a href="#FilterElementMwAttribute"><span class="attr-name">mx</span></a>,
<a href="#FilterElementMyAttribute"><span class="attr-name">my</span></a>,
<a href="#FilterElementMwAttribute"><span class="attr-name">mw</span></a>,
<a href="#FilterElementMhAttribute"><span class="attr-name">mh</span></a>.
These margins attribute override those set on the parent <span class="element">filter</span> element. Note that this doesn't mean that a
filter primitive can expand the filter region itself, just that the
coordinate system used for filter primitives margin attributes can be
different than the one used for the margin attributes on the
<a href="#FilterElement"><span class="element-name">'filter'</span></a> element. </p>
<p>An example of the new attributes, which defines a generic drop shadow
filter: </p>
<pre class="examplesource"> <filter id="dropShadow" x="0" y="0" width="1" height="1"
filterMarginUnits="userSpaceOnUse"
mx="0" my="0" mw="5" mh="5" >
<feGaussianBlur stdDeviation="2" in="SourceAlpha" />
<feOffset dx="2" />
<feMerge>
<feMergeNode />
<feMergeNode in="SourceGraphic" />
</feMerge>
</filter> </pre>
<p>In the above example, the filter region by default covers the entire
bounds of the object (which is not enough to show the shadow). Adding the new
margins extends the width and height by 5 user units each, which is always
enough to display the blur (which has a standard deviation of 2 user units)
and offset (which is another 2 units). </p>
</div>
<p>The <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element has the following attributes which work together to define the filter
effects region:</p>
<ul>
<li><a class="indexref-filter#Q#_element::filterUnits#Q#_attribute" name="FilterUnitsAttribute" id="FilterUnitsAttribute"></a>
<strong>filterUnits={ userSpaceOnUse | objectBoundingBox }</strong>.<br></br>
Defines the coordinate system for attributes <a href="#FilterRegionXYWidthHeightAttributes"><span class="attr-name">x, y,
width, height</span></a>.<br></br>
If <strong>filterUnits="userSpaceOnUse"</strong>, <a href="#FilterRegionXYWidthHeightAttributes"><span class="attr-name">x, y,
width, height</span></a> represent values in the current user coordinate
system in place at the time when the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element is referenced (i.e., the
user coordinate system for the element referencing the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element via a <a href="#FilterProperty"><span class="prop-name">'filter'</span></a> property).<br></br>
If <strong>filterUnits="objectBoundingBox"</strong>, then <a href="#FilterRegionXYWidthHeightAttributes"><span class="attr-name">x, y,
width, height</span></a> represent fractions or percentages of the
bounding box on the referencing element (see Object bounding box units
).<br></br>
If attribute <span class="attr-name">filterUnits</span> is not specified,
then the effect is as if a value of <span class="attr-value">objectBoundingBox</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></li>
<li><a class="indexref-filter#Q#_element::x#Q#_attribute" name="FilterRegionXAttribute" id="FilterRegionXAttribute"></a> <a class="indexref-filter#Q#_element::y#Q#_attribute" name="FilterRegionYAttribute" id="FilterRegionYAttribute"></a> <a class="indexref-filter#Q#_element::width#Q#_attribute" name="FilterRegionWidthAttribute" id="FilterRegionWidthAttribute"></a> <a class="indexref-filter#Q#_element::height#Q#_attribute" name="FilterRegionHeightAttribute" id="FilterRegionHeightAttribute"></a> <a name="FilterRegionXYWidthHeightAttributes" id="FilterRegionXYWidthHeightAttributes"></a> <strong>x, y, width,
height</strong>, which define a rectangular region on the canvas to which
this filter applies.<br></br>
The amount of memory and processing time required to apply the filter are
related to the size of this rectangle and the <a href="#FilterElementFilterResAttribute"><span class="attr-name">filterRes</span></a> attribute of the filter.<br></br>
The coordinate system for these attributes depends on the value for
attribute <a href="#FilterUnitsAttribute"><span class="attr-name">filterUnits</span></a>.<br></br>
The bounds of this rectangle act as a hard clipping region for each <a href="#FilterPrimitivesOverview">filter primitive</a> included with a
given <a href="#FilterElement"><span class="element-name">'filter'</span></a> element; thus, if the effect of
a given filter primitive would extend beyond the bounds of the rectangle
(this sometimes happens when using a <a href="#feGaussianBlurElement"><span class="element-name">'feGaussianBlur'</span></a> filter primitive with a
very large <a href="#feGaussianBlurStdDeviationAttribute"><span class="attr-name">stdDeviation</span></a>), parts of the effect will get
clipped.<br></br>
If <strong>x</strong> or <strong>y</strong> is not specified, the effect
is as if a value of "-10%" were specified.<br></br>
If <strong>width</strong> or <strong>height</strong> is not specified,
the effect is as if a value of "120%" were specified.<br></br>
Negative or zero values for <strong>width</strong> or
<strong>height</strong> disable rendering of the element which referenced
the filter. <br></br>
<span class="anim-target">Animatable:yes.</span></li>
</ul>
<div class="new">
<ul>
<li><a class="indexref-filter#Q#_element::filterMarginUnits#Q#_attribute" name="FilterMarginAttribute" id="FilterMarginAttribute"></a>
<strong>filterMarginUnits={ userSpaceOnUse | objectBoundingBox
}</strong>.<br></br>
Defines the coordinate system for attributes <a href="#FilterRegionMXMYMWMHAttributes"><span class="attr-name">mx, my,
mw, mh</span></a>.<br></br>
If <strong>filterMarginUnits="userSpaceOnUse"</strong>, <a href="#FilterRegionMXMYMWMHAttributes"><span class="attr-name">mx, my,
mw, mh</span></a> represent values in the current user coordinate system
in place at the time when the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element is referenced (i.e., the
user coordinate system for the element referencing the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element via a <a href="#FilterProperty"><span class="prop-name">'filter'</span></a> property).<br></br>
If <strong>filterMarginUnits="objectBoundingBox"</strong>, then <a href="#FilterRegionMXMYMWMHAttributes"><span class="attr-name">mx, my,
mw, mh</span></a> represent fractions or percentages of the bounding box
on the referencing element (see Object bounding box units
).<br></br>
If attribute <span class="attr-name">filterMarginUnits</span> is not
specified, then the effect is as if a value of <span class="attr-value">userSpaceOnUse</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></li>
<li><a class="indexref-filter#Q#_element::mx#Q#_attribute" name="FilterRegionMxAttribute" id="FilterRegionMyAttribute"></a> <a class="indexref-filter#Q#_element::my#Q#_attribute" name="FilterRegionMyAttribute2" id="FilterRegionMyAttribute2"></a> <a class="indexref-filter#Q#_element::mw#Q#_attribute" name="FilterRegionMwAttribute" id="FilterRegionMwAttribute"></a> <a class="indexref-filter#Q#_element::mh#Q#_attribute" name="FilterRegionMhAttribute" id="FilterRegionMhAttribute"></a> <a name="FilterRegionMXMYMWMHAttributes" id="FilterRegionMXMYMWMHAttributes"></a> <strong>mx, my, mw, mh</strong>,
which define deltas to the <a href="#FilterRegionXYWidthHeightAttributes"><span class="attr-name">x, y, width, height</span></a> of the filter region. <br></br>
After the <a href="#FilterRegionXYWidthHeightAttributes"><span class="attr-name">x, y, width, height</span></a> have been calculated for the filter region the
<a href="#FilterRegionMXMYMWMHAttributes"><span class="attr-name">mx, my, mw, mh</span></a> are calculated and added to the filter region. If the
resulting filter region has a negative or zero width or height, the
rendering of the element which referenced the filter is disabled.<br></br>
The coordinate system for these attributes depends on the value for
attribute <a href="#FilterElementFilterMarginUnitsAttribute"><span class="attr-name">filterMarginUnits</span></a>.<br></br>
If <strong>mx</strong> or <strong>my</strong> is not specified, the
effect is as if a value of <span class="attr-value">0</span> were
specified.<br></br>
If <strong>mw</strong> or <strong>mh</strong> is not specified, the
effect is as if a value of <span class="attr-value">0</span> were
specified.<br></br>
<span class="anim-target">Animatable:yes.</span></li>
</ul>
</div>
<ul>
<li><strong>filterRes</strong> (which has the form <code>x-pixels
[y-pixels])</code> indicates the width and height of the intermediate
images in pixels. If not provided, then a reasonable default resolution
appropriate for the target device will be used. (For displays, an
appropriate display resolution, preferably the current display's pixel
resolution, is the default. For printing, an appropriate common printer
resolution, such as 400dpi, is the default.)<br></br>
Care should be taken when assigning a non-default value to this
attribute. Too small of a value may result in unwanted pixelation in the
result. Too large of a value may result in slow processing and large
memory usage.<br></br>
Negative or zero values disable rendering of the element which referenced
the filter. <br></br>
<span class="anim-target">Animatable:yes.</span></li>
</ul>
<p>Note that both of the two possible value for <span class="attr-name">filterUnits</span> (i.e., <span class="attr-value">objectBoundingBox</span> and <span class="attr-value">userSpaceOnUse</span>) result in a filter region whose
coordinate system has its X-axis and Y-axis each parallel to the X-axis and
Y-axis, respectively, of the user coordinate system for the element to which
the filter will be applied.</p>
<p>Sometimes implementers can achieve faster performance when the filter
region can be mapped directly to device pixels; thus, for best performance on
display devices, it is suggested that authors define their region such that
the user agent can align the filter region pixel-for-pixel with the
background. In particular, for best filter effects performance, avoid
rotating or skewing the user coordinate system. Explicit values for attribute
<span class="attr-name">filterRes</span> can either help or harm performance.
If <span class="attr-name">filterRes</span> is smaller than the automatic
(i.e., default) filter resolution, then filter effect might have faster
performance (usually at the expense of quality). If <span class="attr-name">filterRes</span> is larger than the automatic (i.e.,
default) filter resolution, then filter effects performance will usually be
slower.</p>
<p>It is often necessary to provide padding space because the filter effect
might impact bits slightly outside the tight-fitting bounding box on a given
object. For these purposes, it is possible to provide negative percentage
values for <strong>x, y</strong> and percentages values greater than 100% for
<strong>width, height</strong>. This, for example, is why the defaults for
the filter effects region are x="-10%" y="-10%" width="120%"
height="120%".</p>
<a class="indexref-filter_effects_background_image" id="FilterEffectsAccessingBackgroundImage" name="FilterEffectsAccessingBackgroundImage"></a> <a class="indexref-background_image" id="AccessingBackgroundImage" name="AccessingBackgroundImage"></a>
<h2 id="AccessBackgroundImage">5 Accessing the background image</h2>
<p>Two possible pseudo input images for filter effects are <a href="#BackgroundImage">BackgroundImage</a> and <a href="#BackgroundAlpha">BackgroundAlpha</a>, which each represent an image
snapshot of the canvas under the filter region at the time that the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element
is invoked. <a href="#BackgroundImage">BackgroundImage</a> represents both
the color values and alpha channel of the canvas (i.e., RGBA pixel values),
whereas <a href="#BackgroundAlpha">BackgroundAlpha</a> represents only the
alpha channel.</p>
<p>Implementations
will often need to maintain supplemental background image buffers in order to
support the <a href="#BackgroundImage">BackgroundImage</a> and <a href="#BackgroundAlpha">BackgroundAlpha</a> pseudo input images. Sometimes,
the background image buffers will contain an in-memory copy of the
accumulated painting operations on the current canvas.</p>
<p>Because in-memory image buffers can take up significant system resources,
content must explicitly indicate to the
user agent that the document needs access to the background image before <a href="#BackgroundImage">BackgroundImage</a> and <a href="#BackgroundAlpha">BackgroundAlpha</a> pseudo input images can be used.
</p>
<div class="new">
A background image is what's been <i>rendered before</i> the current element.
The host language is responsible for defining what <i>rendered before</i> in
this context means
. For SVG, that uses the painter's algorithm, <i>rendered before</i> means
all of the prior elements in pre order traversal previous to the element to
which the filter is applied. </div>
<p>The property which enables access to the background image is
<strong>'enable-background'</strong>:</p>
<a class="indexref-enable-background#Q#_property" id="EnableBackgroundProperty" name="EnableBackgroundProperty"></a>
<div class="changed">
<div class="propdef">
<dl>
<dt><span class="index-def" title="'margin-top'"><a class="propdef-title" id="propdef-enable-background" name="propdef-enable-background"><span class="prop-name">'enable-background'</span></a></span></dt>
<dd>
<table cellpadding="0" cellspacing="0" class="propinfo" summary="enable-background property">
<tbody>
<tr valign="baseline">
<td><em>Value:</em> </td>
<td>accumulate | new [ <x> <y> <width>
<height> ] | <a href="http://www.w3.org/TR/REC-CSS2/cascade.html#value-def-inherit" class="noxref"><span class="value-inst-inherit noxref">inherit</span></a></td>
</tr>
<tr valign="baseline">
<td><em>Initial:</em> </td>
<td>accumulate</td>
</tr>
<tr valign="baseline">
<td><em>Applies to:</em> </td>
<td>Typically elements that can contain renderable elements. Host
language is responsible for defining the applicable set of
elements.
For SVG: container elements</td>
</tr>
<tr valign="baseline">
<td><em>Inherited:</em> </td>
<td>no</td>
</tr>
<tr valign="baseline">
<td><em>Percentages:</em> </td>
<td>N/A</td>
</tr>
<tr valign="baseline">
<td><em>Media:</em> </td>
<td>visual</td>
</tr>
<tr valign="baseline">
<td><em>Animatable:</em> </td>
<td>no</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</div>
</div>
<div class="changed">
<p>A value of <strong>new</strong> indicates two things:</p>
<ul>
<li>It enables the ability of children of the current
element to access the background image.</li>
<li>It indicates that a new (i.e., initially transparent black) background
image canvas is established and that (in effect) all children of the
current
element shall be rendered into the new background image canvas in
addition to being rendered onto the target device.</li>
</ul>
<p>A meaning of <strong>enable-background: accumulate</strong> (the
initial/default value) depends on context:</p>
<ul>
<li>If an ancestor
element has a property value of 'enable-background:new', then all
renderable child elements of the current
element are rendered both onto the parent
element's background image canvas and onto the target device.</li>
<li>Otherwise, there is no current background image canvas, so it is only
necessary to render
the renderable elements onto the target device. (No need to render to the
background image canvas.)</li>
</ul>
<p>If a filter effect specifies either the <a href="#BackgroundImage">BackgroundImage</a> or the <a href="#BackgroundAlpha">BackgroundAlpha</a> pseudo input images and no
ancestor
element has a property value of 'enable-background:new', then the background
image request is technically in error. Processing will proceed without
interruption (i.e., no error message) and a transparent black image shall be
provided in response to the request.</p>
<p>The optional
<strong><x>,<y>,<width>,<height></strong> parameters
on the <strong>new</strong> value indicate the subregion of the
element to which enable-background applies' user space where access to the
background image is allowed to happen. These parameters enable the user
agent potentially to allocate smaller temporary image buffers than the
default values, which might require the user agent to allocate buffers as
large as the current viewport. Thus, the values
<x>,<y>,<width>,<height> act as a clipping rectangle
on the background image canvas. If more than zero but less than four of the
values <x>,<y>,<width> and <height> are specified or
if negative or zero values are specified for <width> or <height>,
<a href="#BackgroundImage">BackgroundImage</a> and <a href="#BackgroundAlpha">BackgroundAlpha</a> are processed as if background
image processing were not enabled. </p>
</div>
<div class="new">
<h3 id="AccessBackgroundImageSVG">5.1 Accessing the background image in SVG</h3>
<p>This section only applies to the SVG definition of enable-background.</p>
</div>
<p>Assume you have an element E in the document and that E has a series of
ancestors A<sub>1</sub> (its immediate parent), A<sub>2</sub>, etc. (Note:
A<sub>0</sub> is E.) Each ancestor A<sub>i</sub> will have a corresponding
temporary background image offscreen buffer BUF<sub>i</sub>. The contents of
the <em>background image</em> available to a <a href="#FilterElement"><span class="element-name">'filter'</span></a> referenced by E is defined as
follows:</p>
<ul>
<li>Find the element A<sub>i</sub> with the smallest subscript i (including
A<sub>0</sub>=E) for which the <a href="#EnableBackgroundProperty"><span class="prop-name">'enable-background'</span></a> property has the value
<span class="prop-value">new</span>. (Note: if there is no such ancestor
element, then there is no background image available to E, in which case
a transparent black image will be used as E's background image.)</li>
<li>For each A<sub>i</sub> (from i=n to 1), initialize BUF<sub>i</sub> to
transparent black. Render all children of A<sub>i</sub> up to but not
including A<sub>i-1</sub> into BUF<sub>i</sub>. The children are painted,
then filtered, clipped, masked and composited using the various painting,
filtering, clipping, masking and object opacity settings on the given
child. Any filter effects, masking and group opacity that might be set on
A<sub>i</sub> do <em>not</em> apply when rendering the children of
A<sub>i</sub> into BUF<sub>i</sub>.<br></br>
(Note that for the case of A<sub>0</sub>=E, the graphical contents of E
are not rendered into BUF<sub>1</sub> and thus are not part of the
background image available to E. Instead, the graphical contents of E are
available via the <a href="#SourceGraphic">SourceGraphic</a> and <a href="#SourceAlpha">SourceAlpha</a> pseudo input images.)</li>
<li>Then, for each A<sub>i</sub> (from i=1 to n-1), composite
BUF<sub>i</sub> into BUF<sub>i+1</sub>.</li>
<li>The accumulated result (i.e., BUF<sub>n</sub>) represents the
background image available to E.</li>
</ul>
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/enable-background-01.svg">enable-background-01.svg</a>
</div>
<div class="examplesource">
<pre>
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="13.5cm" height="2.7cm" viewBox="0 0 1350 270"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<title>Example enable-background01</title>
<desc>This test case shows five pictures which illustrate the rules
for background image processing.</desc>
<defs>
<filter id="ShiftBGAndBlur"
filterUnits="userSpaceOnUse" x="0" y="0" width="1200" height="400">
<desc>
This filter discards the SourceGraphic, if any, and just produces
a result consisting of the BackgroundImage shifted down 125 units
and then blurred.
</desc>
<feOffset in="BackgroundImage" dx="0" dy="125" />
<feGaussianBlur stdDeviation="8" />
</filter>
<filter id="ShiftBGAndBlur_WithSourceGraphic"
filterUnits="userSpaceOnUse" x="0" y="0" width="1200" height="400">
<desc>
This filter takes the BackgroundImage, shifts it down 125 units, blurs it,
and then renders the SourceGraphic on top of the shifted/blurred background.
</desc>
<feOffset in="BackgroundImage" dx="0" dy="125" />
<feGaussianBlur stdDeviation="8" result="blur" />
<feMerge>
<feMergeNode in="blur"/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<g transform="translate(0,0)">
<desc>The first picture is our reference graphic without filters.</desc>
<rect x="25" y="25" width="100" height="100" fill="red"/>
<g opacity=".5">
<circle cx="125" cy="75" r="45" fill="green"/>
<polygon points="160,25 160,125 240,75" fill="blue"/>
</g>
<rect x="5" y="5" width="260" height="260" fill="none" stroke="blue"/>
</g>
<g enable-background="new" transform="translate(270,0)">
<desc>The second adds an empty 'g' element which invokes ShiftBGAndBlur.</desc>
<rect x="25" y="25" width="100" height="100" fill="red"/>
<g opacity=".5">
<circle cx="125" cy="75" r="45" fill="green"/>
<polygon points="160,25 160,125 240,75" fill="blue"/>
</g>
<g filter="url(#ShiftBGAndBlur)"/>
<rect x="5" y="5" width="260" height="260" fill="none" stroke="blue"/>
</g>
<g enable-background="new" transform="translate(540,0)">
<desc>The third invokes ShiftBGAndBlur on the inner group.</desc>
<rect x="25" y="25" width="100" height="100" fill="red"/>
<g filter="url(#ShiftBGAndBlur)" opacity=".5">
<circle cx="125" cy="75" r="45" fill="green"/>
<polygon points="160,25 160,125 240,75" fill="blue"/>
</g>
<rect x="5" y="5" width="260" height="260" fill="none" stroke="blue"/>
</g>
<g enable-background="new" transform="translate(810,0)">
<desc>The fourth invokes ShiftBGAndBlur on the triangle.</desc>
<rect x="25" y="25" width="100" height="100" fill="red"/>
<g opacity=".5">
<circle cx="125" cy="75" r="45" fill="green"/>
<polygon points="160,25 160,125 240,75" fill="blue"
filter="url(#ShiftBGAndBlur)"/>
</g>
<rect x="5" y="5" width="260" height="260" fill="none" stroke="blue"/>
</g>
<g enable-background="new" transform="translate(1080,0)">
<desc>The fifth invokes ShiftBGAndBlur_WithSourceGraphic on the triangle.</desc>
<rect x="25" y="25" width="100" height="100" fill="red"/>
<g opacity=".5">
<circle cx="125" cy="75" r="45" fill="green"/>
<polygon points="160,25 160,125 240,75" fill="blue"
filter="url(#ShiftBGAndBlur_WithSourceGraphic)"/>
</g>
<rect x="5" y="5" width="260" height="260" fill="none" stroke="blue"/>
</g>
</svg>
</pre>
</div>
<div class="exampleimage">
<img src="examples/enable-background-01.png" alt="Rendering of enable-background-01.svg" />
</div>
</div>
<p>The example above contains five parts, described as follows:</p>
<ol>
<li>The first set is the reference graphic. The reference graphic consists
of a red rectangle followed by a 50% transparent <span class="element-name">'g'</span>
element. Inside the <span class="element-name">'g'</span>
is a green circle that partially overlaps the rectangle and a a blue
triangle that partially overlaps the circle. The three objects are then
outlined by a rectangle stroked with a thin blue line. No filters are
applied to the reference graphic.</li>
<li>The second set enables background image processing and adds an empty
<span class="element-name">'g'</span>
element which invokes the ShiftBGAndBlur filter. This filter takes the
current accumulated background image (i.e., the entire reference graphic)
as input, shifts its offscreen down, blurs it, and then writes the result
to the canvas. Note that the offscreen for the filter is initialized to
transparent black, which allows the already rendered rectangle, circle
and triangle to show through after the filter renders its own result to
the canvas.</li>
<li>The third set enables background image processing and instead invokes
the ShiftBGAndBlur filter on the inner <span class="element-name">'g'</span>
element. The accumulated background at the time the filter is applied
contains only the red rectangle. Because the children of the inner <span class="element-name">'g'</span>
(i.e., the circle and triangle) are not part of the inner <span class="element-name">'g'</span>
element's background and because ShiftBGAndBlur ignores SourceGraphic,
the children of the inner <span class="element-name">'g'</span>
do not appear in the result.</li>
<li>The fourth set enables background image processing and invokes the
ShiftBGAndBlur on the <span class="element-name">'polygon'</span>
element that draws the triangle. The accumulated background at the time
the filter is applied contains the red rectangle plus the green circle
ignoring the effect of the <span class="prop-name">'opacity'</span>
property on the inner <span class="element-name">'g'</span>
element. (Note that the blurred green circle at the bottom does not let
the red rectangle show through on its left side. This is due to ignoring
the effect of the <span class="prop-name">'opacity'</span>
property.) Because the triangle itself is not part of the accumulated
background and because ShiftBGAndBlur ignores SourceGraphic, the triangle
does not appear in the result.</li>
<li>The fifth set is the same as the fourth except that filter
ShiftBGAndBlur_WithSourceGraphic is invoked instead of ShiftBGAndBlur.
ShiftBGAndBlur_WithSourceGraphic performs the same effect as
ShiftBGAndBlur, but then renders the SourceGraphic on top of the shifted,
blurred background image. In this case, SourceGraphic is the blue
triangle; thus, the result is the same as in the fourth case except that
the blue triangle now appears.</li>
</ol>
<h2 id="FilterPrimitivesOverview">6 Filter primitives overview</h2>
<h3 id="FilterPrimitivesOverviewIntro">6.1 Overview</h3>
<p>This section describes the various filter primtives that can be assembled
to achieve a particular filter effect.</p>
<p>Unless otherwise stated, all image filters operate on premultiplied RGBA
samples. Filters which work more naturally on non-premultiplied data
(feColorMatrix and feComponentTransfer) will temporarily undo and redo
premultiplication as specified. All raster effect filtering operations take 1
to N input RGBA images, additional attributes as parameters, and produce a
single output RGBA image.</p>
<p>The RGBA result from each filter primitive will be clamped into the
allowable ranges for colors and opacity values. Thus, for example, the result
from a given filter primitive will have any negative color values or opacity
values adjusted up to color/opacity of zero.</p>
<p>The color space in which a particular filter primitive performs its
operations is determined by the value of property <span class="prop-name">'color-interpolation-filters'</span> on the given filter
primitive. A different property, <span class="prop-name">'color-interpolation'</span> determines the color space for
other color operations. Because these two properties have different initial
values (<span class="prop-name">'color-interpolation-filters'</span> has an
initial value of <span class="prop-value">linearRGB</span> whereas <span class="prop-name">'color-interpolation'</span> has an initial value of <span class="prop-value">sRGB</span>), in some cases to achieve certain results
(e.g., when coordinating gradient interpolation with a filtering operation)
it will be necessary to explicitly set <span class="prop-name">'color-interpolation'</span> to <span class="prop-value">linearRGB</span> or <span class="prop-name">'color-interpolation-filters'</span> to <span class="prop-value">sRGB</span> on particular elements. Note that the examples
below do not explicitly set either <span class="prop-name">'color-interpolation'</span> or <span class="prop-name">'color-interpolation-filters'</span>, so the initial values
for these properties apply to the examples.</p>
<h3 id="CommonAttributes">6.2 Common attributes</h3>
<p>The following attributes are available for most of the filter
primitives:</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a class="indexref-filter_primitives_common_attributes::x#Q#_attribute" id="FilterPrimitiveXAttribute" name="FilterPrimitiveXAttribute"></a>
<span class="adef">x</span> = "<em><coordinate></em>"</dt>
<dd>The minimum x coordinate for the subregion which restricts
calculation and rendering of the given filter primitive. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::y#Q#_attribute" id="FilterPrimitiveYAttribute" name="FilterPrimitiveYAttribute"></a>
<span class="adef">y</span> = "<em><coordinate></em>"</dt>
<dd>The minimum y coordinate for the subregion which restricts
calculation and rendering of the given filter primitive. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>. <br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::width#Q#_attribute" id="FilterPrimitiveWidthAttribute" name="FilterPrimitiveWidthAttribute"></a>
<span class="adef">width</span> = "<em><length></em>"</dt>
<dd>The width of the subregion which restricts calculation and rendering
of the given filter primitive. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
A negative or zero value disables the effect of the given filter
primitive (i.e., the result is a transparent black image).<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::height#Q#_attribute" id="FilterPrimitiveHeightAttribute" name="FilterPrimitiveHeightAttribute"></a>
<span class="adef">height</span> = "<em><length></em>"</dt>
<dd>The height of the subregion which restricts calculation and rendering
of the given filter primitive. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
A negative or zero value disables the effect of the given filter
primitive (i.e., the result is a transparent black image).<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
<div class="new">
<dl>
<dt><a class="indexref-filter_primitives_common_attributes::mx#Q#_attribute" id="FilterCommonMxAttribute" name="FilterCommonMxAttribute"></a>
<span class="adef">mx</span> = "<em><coordinate></em>"</dt>
<dd>The margin delta for the x coordinate of the subregion which
restricts calculation and rendering of the given filter primitive. If
this attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::my#Q#_attribute" id="FilterCommonMyAttribute" name="FilterCommonMyAttribute"></a>
<span class="adef">my</span> = "<em><coordinate></em>"</dt>
<dd>The margin delta for the y coordinate of the subregion which
restricts calculation and rendering of the given filter primitive. If
this attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>. <br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::mw#Q#_attribute" id="FilterCommonMwAttribute" name="FilterCommonMwAttribute"></a>
<span class="adef">mw</span> = "<em><length></em>"</dt>
<dd>The margin delta for the width of the subregion which restricts
calculation and rendering of the given filter primitive. If this
attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::mh#Q#_attribute" id="FilterCommonMhAttribute" name="FilterCommonMhAttribute"></a>
<span class="adef">mh</span> = "<em><length></em>"</dt>
<dd>The margin delta for the height of the subregion which restricts
calculation and rendering of the given filter primitive. If this
attribute is not specified, the effect is as if a value of <span class="attr-value">0</span> were specified. See <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<dl>
<dt><a class="indexref-filter_primitives_common_attributes::result#Q#_attribute" id="FilterPrimitiveResultAttribute" name="FilterPrimitiveResultAttribute"></a>
<span class="adef">result</span> =
"<em><filter-primitive-reference></em>"</dt>
<dd>Assigned name for this filter primitive. If supplied, then graphics
that result from processing this filter primitive can be referenced by
an <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> attribute on a subsequent filter
primitive within the same <a href="#FilterElement"><span class="element-name">'filter'</span></a> element. If no value is
provided, the output will only be available for re-use as the implicit
input into the next filter primitive if that filter primitive provides
no value for its <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> attribute.<br></br>
Note that a <em><filter-primitive-reference></em> is not an XML
ID; instead, a <em><filter-primitive-reference></em> is only
meaningful within a given <a href="#FilterElement"><span class="element-name">'filter'</span></a> element and thus have only
local scope. It is legal for the same
<em><filter-primitive-reference></em> to appear multiple times
within the same <a href="#FilterElement"><span class="element-name">'filter'</span></a> element. When referenced, the
<em><filter-primitive-reference></em> will use the closest
preceding filter primitive with the given result.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a class="indexref-filter_primitives_common_attributes::in#Q#_attribute" id="FilterPrimitiveInAttribute" name="FilterPrimitiveInAttribute"></a>
<span class="adef">in</span> = "<em><a href="#SourceGraphic">SourceGraphic</a> | <a href="#SourceAlpha">SourceAlpha</a> | <a href="#BackgroundImage">BackgroundImage</a> | <a href="#BackgroundAlpha">BackgroundAlpha</a> | <a href="#FillPaint">FillPaint</a> | <a href="#StrokePaint">StrokePaint</a> |
<filter-primitive-reference></em>"</dt>
<dd>Identifies input for the given filter primitive. The value can be
either one of six keywords or can be a string which matches a previous
<a href="#FilterPrimitiveResultAttribute"><span class="attr-name">result</span></a> attribute value within the same <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element. If no value is provided and this is the first filter
primitive, then this filter primitive will use <a href="#SourceGraphic"><span class="attr-value">SourceGraphic</span></a>
as its input. If no value is provided and this is a subsequent filter
primitive, then this filter primitive will use the result from the
previous filter primitive as its input.
<p>If the value for <span class="attr-name">result</span> appears
multiple times within a given <a href="#FilterElement"><span class="element-name">'filter'</span></a> element, then a reference to
that result will use the closest preceding filter primitive with the
given value for attribute <span class="attr-name">result</span>.
Forward references to results are not allowed, and will be treated as
if no result was specified. </p>
Definitions for the six keywords:
<dl>
<dt><a id="SourceGraphic" name="SourceGraphic"><span class="attr-value">SourceGraphic</span></a></dt>
<dd>This keyword represents the graphics elements
that were the original input into the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element. For raster
effects filter primitives, the graphics elements
will be rasterized into an initially clear RGBA raster in image
space. Pixels left untouched by the original graphic will be left
clear. The image is specified to be rendered in linear RGBA
pixels. The alpha channel of this image captures any
anti-aliasing specified by SVG. (Since the raster is linear, the
alpha channel of this image will represent the exact percent
coverage of each pixel.)</dd>
<dt><a id="SourceAlpha" name="SourceAlpha"><span class="attr-value">SourceAlpha</span></a></dt>
<dd>This keyword represents the graphics elements
that were the original input into the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element. <span class="attr-value">SourceAlpha</span> has all of the same rules
as <a href="#SourceGraphic"><span class="attr-value">SourceGraphic</span></a> except that only the
alpha channel is used. The input image is an RGBA image
consisting of implicitly black color values for the RGB channels,
but whose alpha channel is the same as <a href="#SourceGraphic"><span class="attr-value">SourceGraphic</span></a>. If this option is
used, then some implementations might need to rasterize the
graphics elements
in order to extract the alpha channel.</dd>
<dt><a id="BackgroundImage" name="BackgroundImage"><span class="attr-value">BackgroundImage</span></a></dt>
<dd>This keyword represents an image snapshot of the canvas under
the filter region at the time that the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element was invoked. See
<a href="#AccessingBackgroundImage">Accessing the background
image</a>.</dd>
<dt><a id="BackgroundAlpha" name="BackgroundAlpha"><span class="attr-value">BackgroundAlpha</span></a></dt>
<dd>Same as <a href="#BackgroundImage">BackgroundImage</a> except
only the alpha channel is used. See <a href="#SourceAlpha"><span class="attr-value">SourceAlpha</span></a> and <a href="#AccessingBackgroundImage">Accessing the background
image</a>.</dd>
</dl>
<div class="changed">
<dl>
<dt><a id="FillPaint" name="FillPaint"><span class="attr-value">FillPaint</span></a></dt>
<dd>
<p> This keyword represents the target element <i>rendered filled</i>. The host language is responsible for specifying what <i>rendered filled</i> in this context means, if not specified FillPaint will be taken to mean a transparent black image. For svg this keyword represents the value of the <span class="prop-name">'fill'</span>
property on the target element for the filter effect.</p>
<p>
Note that text is generally painted filled, not stroked.
</p>
<p>The FillPaint image has conceptually infinite extent.
Frequently this image is opaque everywhere, but it
might not be if the "paint"
itself has alpha, as in the case of a gradient or pattern which
itself includes transparent or semi-transparent parts.</p>
</dd>
<dt><a id="StrokePaint" name="StrokePaint"><span class="attr-value">StrokePaint</span></a></dt>
<dd>
<p>This keyword represents the target element <i>rendered stroked</i>. The host language is responsible for specifying what <i>rendered stroked</i> in this context means, if not specified StrokePaint will be taken to mean a transparent black image. For svg this keyword represents the value of the <span class="prop-name">'stroke'</span>
property on the target element for the filter effect.</p>
<p>
Note that text is generally painted filled, not stroked.
</p>
<p>The StrokePaint image has conceptually infinite extent.
Frequently this image is opaque everywhere, but it
might not be if the "paint"
itself has alpha, as in the case of a gradient or pattern which
itself includes transparent or semi-transparent parts.</p>
</dd>
</dl>
</div>
<span class="anim-target">Animatable:yes.</span> </dd>
</dl>
</div>
<h3 id="FilterPrimitiveSubRegion">6.3 Filter primitive subregion</h3>
<div class="changed">
<p>All filter primitives have attributes <strong>x</strong>, <strong>y</strong>,
<strong>width</strong> and <strong>height</strong>, and <strong>mx</strong>,
<strong>my</strong>, <strong>mw</strong> and <strong>mh</strong>, which
together identify a subregion which restricts calculation and rendering of
the given filter primitive. The <strong>x</strong>, <strong>y</strong>,
<strong>width</strong> and <strong>height</strong> attributes are defined
according to the same rules as other filter primitives' coordinate and length
attributes and thus represent values in the coordinate system established by
attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element.
The <strong>mx</strong>, <strong>my</strong>, <strong>mw</strong> and
<strong>mh</strong> attributes contain deltas to the corresponding
<strong>x</strong>, <strong>y</strong>, <strong>width</strong> and
<strong>height</strong> attributes and contain values in the coordinate
system established by attribute <a href="#FilterElementPrimitiveMarginUnitsAttribute"><span class="attr-name">primitiveMarginUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element.
</p></div>
<p><strong>x</strong>, <strong>y</strong>, <strong>width</strong> and
<strong>height</strong> default to the union (i.e., tightest fitting bounding
box) of the subregions defined for all referenced nodes. If there are no
referenced nodes (e.g., for <a href="#feImageElement"><span class="element-name">'feImage'</span></a> or <a href="#feTurbulenceElement"><span class="element-name">'feTurbulence'</span></a>), or one or more of the
referenced nodes is a standard input (one of <a href="#SourceGraphic"><span class="attr-value">SourceGraphic</span></a>, <a href="#SourceAlpha"><span class="attr-value">SourceAlpha</span></a>, <a href="#BackgroundImage"><span class="attr-value">BackgroundImage</span></a>, <a href="#BackgroundAlpha"><span class="attr-value">BackgroundAlpha</span></a>,
<a href="#FillPaint"><span class="attr-value">FillPaint</span></a> or <a href="#StrokePaint"><span class="attr-value">StrokePaint</span></a>), or for
<a href="#feTileElement"><span class="element-name">'feTile'</span></a>
(which is special because its principal function is to replicate the
referenced node in X and Y and thereby produce a usually larger result), the
default subregion is 0%,0%,100%,100%, where percentages are relative to the
dimensions of the filter region.</p>
<div class="new">
<p>After the <strong>x</strong>, <strong>y</strong>, <strong>width</strong>,
<strong>height</strong> have been calculated for the filter primitive
subregion the margin attributes <strong>mx</strong>, <strong>my</strong>,
<strong>mw</strong>, <strong>mh</strong> are calculated and added to the
former to make the filter primitive subregion. If the filter primitive
subregion has a negative or zero width or height, the effect of the filter
primitive is disabled. </p>
</div>
<div class="changed">
<p>The filter primitive subregion act as a hard clip clipping rectangle for
the filter primitive.</p>
<p>All intermediate offscreens are defined to not exceed the intersection of
the filter primitive subregion with the <a href="#FilterEffectsRegion">filter
region</a>. The filter region and any of the filter primitive subregions are
to be set up such that all offscreens are made big enough to accommodate any
pixels which even partly intersect with either the filter region or the
filter primitive subregions.</p>
<p><a href="#feTileElement"><span class="element-name">'feTile'</span></a>
references a previous filter primitive and then stitches the tiles together
based on the filter primitive subregion of the referenced filter primitive in
order to fill its own <a href="#FilterPrimitiveSubRegion">filter primitive
subregion</a>.</p>
</div>
<div class="new">
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/filtersubregion00.svg">filtersubregion00.svg</a>
</div>
<div class="examplesource">
<pre>
<svg width="400" height="400" xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="flood" x="0" y="0" width="100%" height="100%" primitiveUnits="objectBoundingBox">
<feFlood x="25%" y="25%" width="50%" height="50%"
flood-color="green" flood-opacity="0.75"/>
</filter>
<filter id="blend" primitiveUnits="objectBoundingBox">
<feBlend x="25%" y="25%" width="50%" height="50%"
in2="SourceGraphic" mode="multiply"/>
</filter>
<filter id="merge" primitiveUnits="objectBoundingBox">
<feMerge x="25%" y="25%" width="50%" height="50%">
<feMergeNode in="SourceGraphic"/>
<feMergeNode in="FillPaint"/>
</feMerge>
</filter>
</defs>
<g fill="none" stroke="blue" stroke-width="4">
<rect width="200" height="200"/>
<line x2="200" y2="200"/>
<line x1="200" y2="200"/>
</g>
<circle fill="green" filter="url(#flood)" cx="100" cy="100" r="90"/>
<g transform="translate(200 0)">
<g fill="none" stroke="blue" stroke-width="4">
<rect width="200" height="200"/>
<line x2="200" y2="200"/>
<line x1="200" y2="200"/>
</g>
<circle fill="green" filter="url(#blend)" cx="100" cy="100" r="90"/>
</g>
<g transform="translate(0 200)">
<g fill="none" stroke="blue" stroke-width="4">
<rect width="200" height="200"/>
<line x2="200" y2="200"/>
<line x1="200" y2="200"/>
</g>
<circle fill="green" fill-opacity="0.5" filter="url(#merge)" cx="100" cy="100" r="90"/>
</g>
</svg> </pre>
</div>
<div class="exampleimage">
<img src="examples/filtersubregion00.png" alt="Rendering of filtersubregion00.svg" />
</div>
</div>
<p>
In the example above there are three rects that each have a cross and a circle in them. The circle element in each one has a different filter applied, but with the same filter primitive subregion. The filter output should be limited to the filter primitive subregion, so you should never see the circles themselves, just the rects that make up the filter primitive subregion.
</p>
<ul>
<li>
The upper left rect shows an <a href="#feFloodElement"><span class="element-name">'feFlood'</span></a> with <span class="attr-name">flood-opacity</span>="<span class="attr-value">75%</span>" so the cross should be visible through the green rect in the middle.
</li>
<li>
The lower left rect shows an <a href="#feMergeElement"><span class="element-name">'feMerge'</span></a> that merges <span class="attr-value">SourceGraphic</span> with <span class="attr-value">FillPaint</span>. Since the circle has <span class="attr-name">fill-opacity</span>="<span class="attr-value">0.5</span>" it will also be transparent so that the cross is visible through the green rect in the middle.
</li>
<li>The upper right rect shows an <a href="#feBlendElement"><span class="element-name">'feBlend'</span></a> that has <span class="attr-name">mode</span>="<span class="attr-value">multiply</span>". Since the circle in this case isn't transparent the result is totally opaque. The rect should be dark green and the cross should not be visible through it.
</li>
</ul>
</div>
<h2 id="LightSourceDefinitions">7 Light source elements and properties</h2>
<h3 id="LightSourceIntro">7.1 Introduction</h3>
<p>The following sections define the elements that define a light source, <a href="#feDistantLightElement"><span class="element-name">'feDistantLight'</span></a>, <a href="#fePointLightElement"><span class="element-name">'fePointLight'</span></a> and
<a href="#feSpotLightElement"><span class="element-name">'feSpotLight'</span></a>,
and property <a href="#LightingColorProperty"><span class="prop-name">'lighting-color'</span></a>, which defines the color of the
light.</p>
<h3 id="feDistantLightElement">7.2 Light source <span class="element-name">'feDistantLight'</span></h3>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feDistantLightAzimuthAttribute" name="feDistantLightAzimuthAttribute"></a> <span class="adef">azimuth</span> = "<em><number></em>"</dt>
<dd>Direction angle for the light source on the XY plane (clockwise), in
degrees.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDistantLightElevationAttribute" name="feDistantLightElevationAttribute"></a> <span class="adef">elevation</span> = "<em><number></em>"</dt>
<dd>Direction angle for the light source on the YZ plane, in degrees.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<h3 id="fePointLightElement">7.3 Light source <span class="element-name">'fePointLight'</span></h3>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="fePointLightXAttribute" name="fePointLightXAttribute"></a> <span class="adef">x</span> = "<em><number></em>"</dt>
<dd>X location for the light source in the coordinate system established
by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="fePointLightYAttribute" name="fePointLightYAttribute"></a> <span class="adef">y</span> = "<em><number></em>"</dt>
<dd>Y location for the light source in the coordinate system established
by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="fePointLightZAttribute" name="fePointLightZAttribute"></a> <span class="adef">z</span> = "<em><number></em>"</dt>
<dd>Z location for the light source in the coordinate system established
by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element, assuming that, in the initial coordinate system
, the positive Z-axis comes out towards the person viewing the content
and assuming that one unit along the Z-axis equals one unit in X or
Y.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<h3 id="feSpotLightElement">7.4 Light source <span class="element-name">'feSpotLight'</span></h3>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feSpotLightXAttribute" name="feSpotLightXAttribute"></a> <span class="adef">x</span> = "<em><number></em>"</dt>
<dd>X location for the light source in the coordinate system established
by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpotLightYAttribute" name="feSpotLightYAttribute"></a> <span class="adef">y</span> = "<em><number></em>"</dt>
<dd>Y location for the light source in the coordinate system established
by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpotLightZAttribute" name="feSpotLightZAttribute"></a> <span class="adef">z</span> = "<em><number></em>"</dt>
<dd>Z location for the light source in the coordinate system established
by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element, assuming that, in the initial coordinate system
, the positive Z-axis comes out towards the person viewing the content
and assuming that one unit along the Z-axis equals one unit in X or
Y.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpotLightPointsAtXAttribute" name="feSpotLightPointsAtXAttribute"></a> <span class="adef">pointsAtX</span> = "<em><number></em>"</dt>
<dd>X location in the coordinate system established by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element of the point at which the light source is pointing.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpotLightPointsAtYAttribute" name="feSpotLightPointsAtYAttribute"></a> <span class="adef">pointsAtY</span> = "<em><number></em>"</dt>
<dd>Y location in the coordinate system established by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element of the point at which the light source is pointing.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpotLightPointsAtZAttribute" name="feSpotLightPointsAtZAttribute"></a> <span class="adef">pointsAtZ</span> = "<em><number></em>"</dt>
<dd>Z location of the point at which the light source is pointing,
assuming that, in the initial coordinate system
, the positive Z-axis comes out towards the person viewing the content
and assuming that one unit along the Z-axis equals one unit in X or
Y.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpotLightSpecularExponentAttribute" name="feSpotLightSpecularExponentAttribute"></a> <span class="adef">specularExponent</span> = "<em><number></em>"</dt>
<dd>Exponent value controlling the focus for the light source.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpotLightLimitingConeAngleAttribute" name="feSpotLightLimitingConeAngleAttribute"></a> <span class="adef">limitingConeAngle</span> = "<em><number></em>"</dt>
<dd>A limiting cone which restricts the region where the light is
projected. No light is projected outside the cone. <span class="attr-name">limitingConeAngle</span> represents the angle between
the spot light axis (i.e. the axis between the light source and the
point to which it is pointing at) and the spot light cone. User agents
should apply a smoothing technique such as anti-aliasing at the
boundary of the cone.<br></br>
If no value is specified, then no limiting cone will be applied.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<h3 id="LightingColorProperty">7.5 The <span class="prop-name">'lighting-color'</span> property</h3>
<p>The <span class="prop-name">'lighting-color'</span> property defines the
color of the light source for filter primitives <a href="#feDiffuseLightingElement"><span class="element-name">'feDiffuseLighting'</span></a> and <a href="#feSpecularLightingElement"><span class="element-name">'feSpecularLighting'</span></a>.</p>
<div class="propdef">
<dl>
<dt><span class="index-def" title="'margin-top'"><a class="propdef-title" id="propdef-lighting-color" name="propdef-lighting-color"><span class="prop-name">'lighting-color'</span></a></span></dt>
<dd>
<table cellpadding="0" cellspacing="0" class="propinfo" summary="lighting-color property">
<tbody>
<tr valign="baseline">
<td><em>Value:</em> </td>
<td>currentColor |<br></br>
<color>
[icc-color(<name>[,<icccolorvalue>]*)] |<br></br>
<a href="http://www.w3.org/TR/REC-CSS2/cascade.html#value-def-inherit" class="noxref"><span class="value-inst-inherit noxref">inherit</span></a></td>
</tr>
<tr valign="baseline">
<td><em>Initial:</em> </td>
<td>white</td>
</tr>
<tr valign="baseline">
<td><em>Applies to:</em> </td>
<td><a href="#feDiffuseLightingElement"><span class="element-name">'feDiffuseLighting'</span></a> and <a href="#feSpecularLightingElement"><span class="element-name">'feSpecularLighting'</span></a>
elements</td>
</tr>
<tr valign="baseline">
<td><em>Inherited:</em> </td>
<td>no</td>
</tr>
<tr valign="baseline">
<td><em>Percentages:</em> </td>
<td>N/A</td>
</tr>
<tr valign="baseline">
<td><em>Media:</em> </td>
<td>visual</td>
</tr>
<tr valign="baseline">
<td><em>Animatable:</em> </td>
<td>yes</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</div>
<h2 id="feBlendElement">8 Filter primitive <span class="element-name">'feBlend'</span></h2>
<p>This filter composites two objects together using commonly used imaging
software blending modes. It performs a pixel-wise combination of two input
images.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feBlendModeAttribute" name="feBlendModeAttribute"></a> <span class="adef">mode</span> = "<em>normal | multiply | screen | darken |
lighten</em>"</dt>
<dd>One of the image blending modes (see <a href="#BlendingTable">table</a> below). Default is: normal.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feBlendIn2Attribute" name="feBlendIn2Attribute"></a> <span class="adef">in2</span> = "<em>(see <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a>
attribute)</em>"</dt>
<dd>The second input image to the blending operation. This attribute can
take on the same values as the <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> attribute.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<p>For all feBlend modes, the result opacity is computed as follows:</p>
<pre>qr = 1 - (1-qa)*(1-qb)</pre>
<p>For the compositing formulas below, the following definitions apply:</p>
<pre>image A = in
image B = in2
cr = Result color (RGB) - premultiplied
qa = Opacity value at a given pixel for image A
qb = Opacity value at a given pixel for image B
ca = Color (RGB) at a given pixel for image A - premultiplied
cb = Color (RGB) at a given pixel for image B - premultiplied </pre>
<p><a id="BlendingTable" name="BlendingTable"></a>The following table
provides the list of available image blending modes:</p>
<div class="note-editor">
ED: make table look nicer</div>
<table width="500" border="1" summary="blending modes">
<tbody>
<tr>
<td>Image Blending Mode</td>
<td>Formula for computing result color</td>
</tr>
<tr>
<td>normal</td>
<td>cr = (1 - qa) * cb + ca</td>
</tr>
<tr>
<td>multiply</td>
<td>cr = (1-qa)*cb + (1-qb)*ca + ca*cb</td>
</tr>
<tr>
<td>screen</td>
<td>cr = cb + ca - ca * cb</td>
</tr>
<tr>
<td>darken</td>
<td>cr = Min ((1 - qa) * cb + ca, (1 - qb) * ca + cb)</td>
</tr>
<tr>
<td>lighten</td>
<td>cr = Max ((1 - qa) * cb + ca, (1 - qb) * ca + cb)</td>
</tr>
</tbody>
</table>
<p><span class="attr-value">'normal'</span> blend mode is equivalent to <a href="#feCompositeOperatorAttribute"><span class="attr-value">operator="over"</span></a> on the <a href="#feCompositeElement"><span class="element-name">'feComposite'</span></a>
filter primitive, matches the blending method used by <a href="#feMergeElement"><span class="element-name">'feMerge'</span></a> and matches
the <a href="http://www.w3.org/TR/SVGMobile12/painting.html#CompositingSimpleAlpha">simple alpha compositing</a>
technique used in SVG for all compositing outside of filter effects.</p>
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/feBlend.svg">feBlend.svg</a>
</div>
<div class="examplesource">
<pre>
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="5cm" height="5cm" viewBox="0 0 500 500"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<title>Example feBlend - Examples of feBlend modes</title>
<desc>Five text strings blended into a gradient,
with one text string for each of the five feBlend modes.</desc>
<defs>
<linearGradient id="MyGradient" gradientUnits="userSpaceOnUse"
x1="100" y1="0" x2="300" y2="0">
<stop offset="0" stop-color="#000000" />
<stop offset=".33" stop-color="#ffffff" />
<stop offset=".67" stop-color="#ff0000" />
<stop offset="1" stop-color="#808080" />
</linearGradient>
<filter id="Normal">
<feBlend mode="normal" in2="BackgroundImage" in="SourceGraphic"/>
</filter>
<filter id="Multiply">
<feBlend mode="multiply" in2="BackgroundImage" in="SourceGraphic"/>
</filter>
<filter id="Screen">
<feBlend mode="screen" in2="BackgroundImage" in="SourceGraphic"/>
</filter>
<filter id="Darken">
<feBlend mode="darken" in2="BackgroundImage" in="SourceGraphic"/>
</filter>
<filter id="Lighten">
<feBlend mode="lighten" in2="BackgroundImage" in="SourceGraphic"/>
</filter>
</defs>
<rect fill="none" stroke="blue"
x="1" y="1" width="498" height="498"/>
<g enable-background="new" >
<rect x="100" y="20" width="300" height="460" fill="url(#MyGradient)" />
<g font-family="Verdana" font-size="75" fill="#888888" fill-opacity=".6" >
<text x="50" y="90" filter="url(#Normal)" >Normal</text>
<text x="50" y="180" filter="url(#Multiply)" >Multiply</text>
<text x="50" y="270" filter="url(#Screen)" >Screen</text>
<text x="50" y="360" filter="url(#Darken)" >Darken</text>
<text x="50" y="450" filter="url(#Lighten)" >Lighten</text>
</g>
</g>
</svg>
</pre>
</div>
<div class="exampleimage">
<img src="examples/feBlend.png" alt="Rendering of feBlend.svg" />
</div>
</div>
<h2 id="feColorMatrixElement">9 Filter primitive <span class="element-name">'feColorMatrix'</span></h2>
<p>This filter applies a matrix transformation:</p>
<pre>| R' | | a00 a01 a02 a03 a04 | | R |
| G' | | a10 a11 a12 a13 a14 | | G |
| B' | = | a20 a21 a22 a23 a24 | * | B |
| A' | | a30 a31 a32 a33 a34 | | A |
| 1 | | 0 0 0 0 1 | | 1 |</pre>
<div class="note-editor">
ED: Make this in mathml, how to export? (want same look as in
coords.html)</div>
<p>on the RGBA color and alpha values of every pixel on the input graphics to
produce a result with a new set of RGBA color and alpha values.</p>
<p>The calculations are performed on non-premultiplied color values. If the
input graphics consists of premultiplied color values, those values are
automatically converted into non-premultiplied color values for this
operation.</p>
<p>These matrices often perform an identity mapping in the alpha channel. If
that is the case, an implementation can avoid the costly undoing and redoing
of the premultiplication for all pixels with A = 1.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feColorMatrixTypeAttribute" name="feColorMatrixTypeAttribute"></a> <span class="adef">type</span> =
"<em>matrix | saturate | hueRotate | luminanceToAlpha</em>"</dt>
<dd>Indicates the type of matrix operation. The keyword <span class="attr-name">matrix</span> indicates that a full 5x4 matrix of
values will be provided. The other keywords represent convenience
shortcuts to allow commonly used color operations to be performed
without specifying a complete matrix.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feColorMatrixValuesAttribute" name="feColorMatrixValuesAttribute"></a> <span class="adef">values</span> =
"<em>list of <number>s</em>"</dt>
<dd>The contents of <span class="attr-name">values</span> depends on the
value of attribute <a href="#feColorMatrixTypeAttribute"><span class="attr-name">type</span></a>:
<ul>
<li>For <span class="attr-value">type="matrix"</span>, <span class="attr-name">values</span> is a list of 20 matrix values (a00
a01 a02 a03 a04 a10 a11 ... a34), separated by whitespace and/or a
comma. For example, the identity matrix could be expressed as:
<pre>type="matrix"
values="1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0"</pre>
</li>
<li>For <span class="attr-value">type="saturate"</span>, <span class="attr-name">values</span> is a single real number value (0 to
1). A <span class="attr-value">saturate</span> operation is
equivalent to the following matrix operation:
<pre>| R' | |0.213+0.787s 0.715-0.715s 0.072-0.072s 0 0 | | R |
| G' | |0.213-0.213s 0.715+0.285s 0.072-0.072s 0 0 | | G |
| B' | = |0.213-0.213s 0.715-0.715s 0.072+0.928s 0 0 | * | B |
| A' | | 0 0 0 1 0 | | A |
| 1 | | 0 0 0 0 1 | | 1 |</pre>
<div class="note-editor">
ED: Make this in mathml, how to export? (want same look as in
coords.html)</div>
</li>
<li>For <span class="attr-value">type="hueRotate"</span>, <span class="attr-name">values</span> is a single one real number value
(degrees). A <span class="attr-value">hueRotate</span> operation is
equivalent to the following matrix operation:
<pre>| R' | | a00 a01 a02 0 0 | | R |
| G' | | a10 a11 a12 0 0 | | G |
| B' | = | a20 a21 a22 0 0 | * | B |
| A' | | 0 0 0 1 0 | | A |
| 1 | | 0 0 0 0 1 | | 1 |</pre>
<div class="note-editor">
ED: Make this in mathml, how to export? (want same look as in
coords.html)</div>
where the terms a00, a01, etc. are calculated as follows:
<pre>| a00 a01 a02 | [+0.213 +0.715 +0.072]
| a10 a11 a12 | = [+0.213 +0.715 +0.072] +
| a20 a21 a22 | [+0.213 +0.715 +0.072]
[+0.787 -0.715 -0.072]
cos(hueRotate value) * [-0.213 +0.285 -0.072] +
[-0.213 -0.715 +0.928]
[-0.213 -0.715+0.928]
sin(hueRotate value) * [+0.143 +0.140-0.283]
[-0.787 +0.715+0.072]</pre>
<div class="note-editor">
ED: Make this in mathml, how to export? (want same look as in
coords.html)</div>
Thus, the upper left term of the hue matrix turns out to be:
<pre>.213 + cos(hueRotate value)*.787 - sin(hueRotate value)*.213</pre>
<div class="note-editor">
ED: Make this in mathml, how to export? (want same look as in
coords.html)</div>
</li>
<li>For <span class="attr-value">type="luminanceToAlpha"</span>,
<span class="attr-name">values</span> is not applicable. A <span class="attr-value">luminanceToAlpha</span> operation is equivalent
to the following matrix operation:
<pre> | R' | | 0 0 0 0 0 | | R |
| G' | | 0 0 0 0 0 | | G |
| B' | = | 0 0 0 0 0 | * | B |
| A' | | 0.2125 0.7154 0.0721 0 0 | | A |
| 1 | | 0 0 0 0 1 | | 1 |</pre>
<div class="note-editor">
ED: Make this in mathml, how to export? (want same look as in
coords.html)</div>
</li>
</ul>
If the attribute is not specified, then the default behavior depends on
the value of attribute <a href="#feColorMatrixTypeAttribute"><span class="attr-name">type</span></a>. If <span class="attr-value">type="matrix"</span>, then this attribute defaults
to the identity matrix. If <span class="attr-value">type="saturate"</span>, then this attribute defaults
to the value <span class="attr-value">1</span>, which results in the
identify matrix. If <span class="attr-value">type="hueRotate"</span>,
then this attribute defaults to the value <span class="attr-value">0</span>, which results in the identify matrix.<br></br>
<span class="anim-target">Animatable:yes.</span> </dd>
</dl>
</div>
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/feColorMatrix.svg">feColorMatrix.svg</a>
</div>
<div class="examplesource">
<pre>
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="8cm" height="5cm" viewBox="0 0 800 500"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<title>Example feColorMatrix - Examples of feColorMatrix operations</title>
<desc>Five text strings showing the effects of feColorMatrix:
an unfiltered text string acting as a reference,
use of the feColorMatrix matrix option to convert to grayscale,
use of the feColorMatrix saturate option,
use of the feColorMatrix hueRotate option,
and use of the feColorMatrix luminanceToAlpha option.</desc>
<defs>
<linearGradient id="MyGradient" gradientUnits="userSpaceOnUse"
x1="100" y1="0" x2="500" y2="0">
<stop offset="0" stop-color="#ff00ff" />
<stop offset=".33" stop-color="#88ff88" />
<stop offset=".67" stop-color="#2020ff" />
<stop offset="1" stop-color="#d00000" />
</linearGradient>
<filter id="Matrix" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feColorMatrix type="matrix" in="SourceGraphic"
values=".33 .33 .33 0 0
.33 .33 .33 0 0
.33 .33 .33 0 0
.33 .33 .33 0 0"/>
</filter>
<filter id="Saturate40" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feColorMatrix type="saturate" in="SourceGraphic" values="40%"/>
</filter>
<filter id="HueRotate90" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feColorMatrix type="hueRotate" in="SourceGraphic" values="90"/>
</filter>
<filter id="LuminanceToAlpha" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feColorMatrix type="luminanceToAlpha" in="SourceGraphic" result="a"/>
<feComposite in="SourceGraphic" in2="a" operator="in" />
</filter>
</defs>
<rect fill="none" stroke="blue"
x="1" y="1" width="798" height="498"/>
<g font-family="Verdana" font-size="75"
font-weight="bold" fill="url(#MyGradient)" >
<rect x="100" y="0" width="500" height="20" />
<text x="100" y="90">Unfiltered</text>
<text x="100" y="190" filter="url(#Matrix)" >Matrix</text>
<text x="100" y="290" filter="url(#Saturate40)" >Saturate</text>
<text x="100" y="390" filter="url(#HueRotate90)" >HueRotate</text>
<text x="100" y="490" filter="url(#LuminanceToAlpha)" >Luminance</text>
</g>
</svg>
</pre>
</div>
<div class="exampleimage">
<img src="examples/feColorMatrix.png" alt="Rendering of feColorMatrix.svg" />
</div>
</div>
<h2 id="feComponentTransferElement">10 Filter primitive <span class="element-name">'feComponentTransfer'</span></h2>
<p>This filter primitive performs component-wise remapping of data as
follows:</p>
<pre>R' = <a href="#feFuncRElement">feFuncR</a>( R )
G' = <a href="#feFuncGElement">feFuncG</a>( G )
B' = <a href="#feFuncBElement">feFuncB</a>( B )
A' = <a href="#feFuncAElement">feFuncA</a>( A )</pre>
<p>for every pixel. It allows operations like brightness adjustment, contrast
adjustment, color balance or thresholding.</p>
<p>The calculations are performed on non-premultiplied color values. If the
input graphics consists of premultiplied color values, those values are
automatically converted into non-premultiplied color values for this
operation. (Note that the undoing and redoing of the premultiplication can be
avoided if <a href="#feFuncAElement">feFuncA</a> is the identity transform
and all alpha values on the source graphic are set to 1.)</p>
<a id="feComponentTransferAttributes" name="feComponentTransferAttributes"></a> <a id="feFuncR" name="feFuncR"></a><a class="indexref-feFuncR#Q#_element" id="feFuncRElement" name="feFuncRElement"></a> <a id="feFuncG" name="feFuncG"></a><a class="indexref-feFuncG#Q#_element" id="feFuncGElement" name="feFuncGElement"></a> <a id="feFuncB" name="feFuncB"></a><a class="indexref-feFuncB#Q#_element" id="feFuncBElement" name="feFuncBElement"></a> <a id="feFuncA" name="feFuncA"></a><a class="indexref-feFuncA#Q#_element" id="feFuncAElement" name="feFuncAElement"></a>
<dl>
<dt>The specification of the transfer functions is defined by the
sub-elements to <span class="element-name">'feComponentTransfer'</span>:</dt>
<dd><span class="element-name">'feFuncR'</span>, transfer function for
red component of the input graphic</dd>
<dd><span class="element-name">'feFuncG'</span>, transfer function for
green component of the input graphic</dd>
<dd><span class="element-name">'feFuncB'</span>, transfer function for
blue component of the input graphic</dd>
<dd><span class="element-name">'feFuncA'</span>, transfer function for
alpha component of the input graphic</dd>
</dl>
<p>The attributes below apply to sub-elements <span class="element-name">'feFuncR'</span>, <span class="element-name">'feFuncG'</span>, <span class="element-name">'feFuncB'</span> and <span class="element-name">'feFuncA'</span> define the transfer functions.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feComponentTransferTypeAttribute" name="feComponentTransferTypeAttribute"></a> <span class="adef">type</span>
= "<em>identity | table | discrete | linear | gamma</em>"</dt>
<dd><p>Indicates the type of component transfer function. The type of
function determines the applicability of the other attributes.</p>
<ul>
<li>For <span class="attr-value">identity</span>:
<pre>C' = C</pre>
</li>
<li>For <span class="attr-value">table</span>, the function is
defined by linear interpolation into a lookup table by attribute <a href="#feComponentTransferTableValuesAttribute"><span class="attr-name">tableValues</span></a>, which provides a list of
<em>n+1</em> values (i.e., v<sub>0</sub> to v<sub>n</sub>) in order
to identify <em>n</em> interpolation ranges. Interpolations use the
following formula.
<p>For a value <code>C</code> pick a <code>k</code> such that:</p>
<p class="filterformula">k/N <= C < (k+1)/N</p>
<p>The result <code>C'</code> is given by:</p>
<p class="filterformula">C' = v<sub>k</sub> + (C - k/N)*N *
(v<sub>k+1</sub> - v<sub>k</sub>)</p>
</li>
<li>For <span class="attr-value">discrete</span>, the function is
defined by the step function defined by attribute <a href="#feComponentTransferTableValuesAttribute"><span class="attr-name">tableValues</span></a>, which provides a list of
<em>n</em> values (i.e., v<sub>0</sub> to v<sub>n-1</sub>) in order
to identify a step function consisting of <em>n</em> steps. The
step function is defined by the following formula.
<p>For a value <code>C</code> pick a <code>k</code> such that:</p>
<p class="filterformula">k/N <= C < (k+1)/N</p>
<p>The result <code>C'</code> is given by:</p>
<p class="filterformula">C' = v<sub>k</sub></p>
</li>
<li>For <span class="attr-value">linear</span>, the function is
defined by the following linear equation:
<p class="filterformula">C' = <a href="#feComponentTransferSlopeAttribute"><span class="attr-name">slope</span></a> * C + <a href="#feComponentTransferInterceptAttribute"><span class="attr-name">intercept</span></a></p>
</li>
<li>For <span class="attr-value">gamma</span>, the function is
defined by the following exponential function:
<p class="filterformula">C' = <a href="#feComponentTransferAmplitudeAttribute"><span class="attr-name">amplitude</span></a> * pow(C, <a href="#feComponentTransferExponentAttribute"><span class="attr-name">exponent</span></a>) + <a href="#feComponentTransferOffsetAttribute"><span class="attr-name">offset</span></a></p>
</li>
</ul>
<span class="anim-target">Animatable:yes.</span> </dd>
<dt><a id="feComponentTransferTableValuesAttribute" name="feComponentTransferTableValuesAttribute"></a> <span class="adef">tableValues</span> = "<em>(list of <number>s)</em>"</dt>
<dd>When <span class="attr-value">type="table"</span>, the list of
<number>
s <em>v0,v1,...vn</em>, separated by white space and/or a comma, which
define the lookup table. An empty list results in an identity transfer
function. If the attribute is not specified, then the effect is as if
an empty list were provided.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feComponentTransferSlopeAttribute" name="feComponentTransferSlopeAttribute"></a> <span class="adef">slope</span> = "<em><number></em>"</dt>
<dd>When <span class="attr-value">type="linear"</span>, the slope of the
linear function.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feComponentTransferInterceptAttribute" name="feComponentTransferInterceptAttribute"></a> <span class="adef">intercept</span> = "<em><number></em>"</dt>
<dd>When <span class="attr-value">type="linear"</span>, the intercept of
the linear function.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feComponentTransferAmplitudeAttribute" name="feComponentTransferAmplitudeAttribute"></a> <span class="adef">amplitude</span> = "<em><number></em>"</dt>
<dd>When <span class="attr-value">type="gamma"</span>, the amplitude of
the gamma function.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feComponentTransferExponentAttribute" name="feComponentTransferExponentAttribute"></a> <span class="adef">exponent</span> = "<em><number></em>"</dt>
<dd>When <span class="attr-value">type="gamma"</span>, the exponent of
the gamma function.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feComponentTransferOffsetAttribute" name="feComponentTransferOffsetAttribute"></a> <span class="adef">offset</span> = "<em><number></em>"</dt>
<dd>When <span class="attr-value">type="gamma"</span>, the offset of the
gamma function.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
<dl>
<dt><em>Attributes defined elsewhere:</em></dt>
<dd><a href="http://www.w3.org/TR/SVGMobile12/struct.html#Core.attrib">%stdAttrs;</a>
, <a href="#CommonAttributes">%filter_primitive_attributes_with_in;</a>,
<a href="http://www.w3.org/TR/SVG11/styling.html#UsingPresentationAttributes">%PresentationAttributes-FilterPrimitives;</a>
.</dd>
</dl>
</div>
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/feComponentTransfer.svg">feComponentTransfer.svg</a>
</div>
<div class="examplesource">
<pre>
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="8cm" height="4cm" viewBox="0 0 800 400"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<title>Example feComponentTransfer - Examples of feComponentTransfer operations</title>
<desc>Four text strings showing the effects of feComponentTransfer:
an identity function acting as a reference,
use of the feComponentTransfer table option,
use of the feComponentTransfer linear option,
and use of the feComponentTransfer gamma option.</desc>
<defs>
<linearGradient id="MyGradient" gradientUnits="userSpaceOnUse"
x1="100" y1="0" x2="600" y2="0">
<stop offset="0" stop-color="#ff0000" />
<stop offset=".33" stop-color="#00ff00" />
<stop offset=".67" stop-color="#0000ff" />
<stop offset="1" stop-color="#000000" />
</linearGradient>
<filter id="Identity" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="identity"/>
<feFuncG type="identity"/>
<feFuncB type="identity"/>
<feFuncA type="identity"/>
</feComponentTransfer>
</filter>
<filter id="Table" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="table" tableValues="0 0 1 1"/>
<feFuncG type="table" tableValues="1 1 0 0"/>
<feFuncB type="table" tableValues="0 1 1 0"/>
</feComponentTransfer>
</filter>
<filter id="Linear" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="linear" slope=".5" intercept=".25"/>
<feFuncG type="linear" slope=".5" intercept="0"/>
<feFuncB type="linear" slope=".5" intercept=".5"/>
</feComponentTransfer>
</filter>
<filter id="Gamma" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feComponentTransfer>
<feFuncR type="gamma" amplitude="2" exponent="5" offset="0"/>
<feFuncG type="gamma" amplitude="2" exponent="3" offset="0"/>
<feFuncB type="gamma" amplitude="2" exponent="1" offset="0"/>
</feComponentTransfer>
</filter>
</defs>
<rect fill="none" stroke="blue"
x="1" y="1" width="798" height="398"/>
<g font-family="Verdana" font-size="75"
font-weight="bold" fill="url(#MyGradient)" >
<rect x="100" y="0" width="600" height="20" />
<text x="100" y="90">Identity</text>
<text x="100" y="190" filter="url(#Table)" >TableLookup</text>
<text x="100" y="290" filter="url(#Linear)" >LinearFunc</text>
<text x="100" y="390" filter="url(#Gamma)" >GammaFunc</text>
</g>
</svg>
</pre>
</div>
<div class="exampleimage">
<img src="examples/feComponentTransfer.png" alt="Rendering of feComponentTransfer.svg" />
</div>
</div>
<h2 id="feCompositeElement">11 Filter primitive <span class="element-name">'feComposite'</span></h2>
<p>This filter performs the combination of the two input images pixel-wise in
image space using one of the Porter-Duff [<a href="#ref-PORTERDUFF">PORTERDUFF</a>] compositing operations: <em>over, in,
atop, out, xor</em>. Additionally, a component-wise <em>arithmetic</em>
operation (with the result clamped between [0..1]) can be applied.</p>
<p>The <em>arithmetic</em> operation is useful for combining the output from
the <a href="#feDiffuseLightingElement"><span class="element-name">'feDiffuseLighting'</span></a> and <a href="#feSpecularLightingElement"><span class="element-name">'feSpecularLighting'</span></a> filters with texture
data. It is also useful for implementing <em>dissolve</em>. If the
<em>arithmetic</em> operation is chosen, each result pixel is computed using
the following formula:</p>
<pre>result = k1*i1*i2 + k2*i1 + k3*i2 + k4</pre>
<p>For this filter primitive, the extent of the resulting image might grow as
described in the section that describes the <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feCompositeOperatorAttribute" name="feCompositeOperatorAttribute"></a> <span class="adef">operator</span>
= "<em>over | in | out | atop | xor | arithmetic</em>"</dt>
<dd>The compositing operation that is to be performed. All of the <span class="attr-name">operator</span> types except <span class="attr-value">arithmetic</span> match the correspond operation as
described in [<a href="#ref-PORTERDUFF">PORTERDUFF</a>]. The <span class="attr-value">arithmetic</span> operator is described above.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feCompositeK1Attribute" name="feCompositeK1Attribute"></a> <span class="adef">k1</span> = "<em><number></em>"</dt>
<dd>Only applicable if <span class="attr-value">operator="arithmetic"</span>.<br></br>
If the attribute is not specified, the effect is as if a value of "0"
were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feCompositeK2Attribute" name="feCompositeK2Attribute"></a> <span class="adef">k2</span> = "<em><number></em>"</dt>
<dd>Only applicable if <span class="attr-value">operator="arithmetic"</span>.<br></br>
If the attribute is not specified, the effect is as if a value of "0"
were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feCompositeK3Attribute" name="feCompositeK3Attribute"></a> <span class="adef">k3</span> = "<em><number></em>"</dt>
<dd>Only applicable if <span class="attr-value">operator="arithmetic"</span>.<br></br>
If the attribute is not specified, the effect is as if a value of "0"
were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feCompositeK4Attribute" name="feCompositeK4Attribute"></a> <span class="adef">k4</span> = "<em><number></em>"</dt>
<dd>Only applicable if <span class="attr-value">operator="arithmetic"</span>.<br></br>
If the attribute is not specified, the effect is as if a value of "0"
were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feCompositeIn2Attribute" name="feCompositeIn2Attribute"></a>
<span class="adef">in2</span> = "<em>(see <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a>
attribute)</em>"</dt>
<dd>The second input image to the compositing operation. This attribute
can take on the same values as the <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> attribute.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/feComposite.svg">feComposite.svg</a>
</div>
<div class="examplesource">
<pre>
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="330" height="195" viewBox="0 0 1100 650" version="1.1"
xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Example feComposite - Examples of feComposite operations</title>
<desc>Four rows of six pairs of overlapping triangles depicting
the six different feComposite operators under different
opacity values and different clearing of the background.</desc>
<defs>
<desc>Define two sets of six filters for each of the six compositing operators.
The first set wipes out the background image by flooding with opaque white.
The second set does not wipe out the background, with the result
that the background sometimes shines through and is other cases
is blended into itself (i.e., "double-counting").</desc>
<filter id="overFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood"/>
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="over" result="comp"/>
<feMerge> <feMergeNode in="flood"/> <feMergeNode in="comp"/> </feMerge>
</filter>
<filter id="inFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood"/>
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="in" result="comp"/>
<feMerge> <feMergeNode in="flood"/> <feMergeNode in="comp"/> </feMerge>
</filter>
<filter id="outFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood"/>
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="out" result="comp"/>
<feMerge> <feMergeNode in="flood"/> <feMergeNode in="comp"/> </feMerge>
</filter>
<filter id="atopFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood"/>
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="atop" result="comp"/>
<feMerge> <feMergeNode in="flood"/> <feMergeNode in="comp"/> </feMerge>
</filter>
<filter id="xorFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood"/>
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="xor" result="comp"/>
<feMerge> <feMergeNode in="flood"/> <feMergeNode in="comp"/> </feMerge>
</filter>
<filter id="arithmeticFlood" filterUnits="objectBoundingBox"
x="-5%" y="-5%" width="110%" height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood"/>
<feComposite in="SourceGraphic" in2="BackgroundImage" result="comp"
operator="arithmetic" k1=".5" k2=".5" k3=".5" k4=".5"/>
<feMerge> <feMergeNode in="flood"/> <feMergeNode in="comp"/> </feMerge>
</filter>
<filter id="overNoFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="over" result="comp"/>
</filter>
<filter id="inNoFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="in" result="comp"/>
</filter>
<filter id="outNoFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="out" result="comp"/>
</filter>
<filter id="atopNoFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="atop" result="comp"/>
</filter>
<filter id="xorNoFlood" filterUnits="objectBoundingBox" x="-5%" y="-5%" width="110%" height="110%">
<feComposite in="SourceGraphic" in2="BackgroundImage" operator="xor" result="comp"/>
</filter>
<filter id="arithmeticNoFlood" filterUnits="objectBoundingBox"
x="-5%" y="-5%" width="110%" height="110%">
<feComposite in="SourceGraphic" in2="BackgroundImage" result="comp"
operator="arithmetic" k1=".5" k2=".5" k3=".5" k4=".5"/>
</filter>
<path id="Blue100" d="M 0 0 L 100 0 L 100 100 z" fill="#00ffff" />
<path id="Red100" d="M 0 0 L 0 100 L 100 0 z" fill="#ff00ff" />
<path id="Blue50" d="M 0 125 L 100 125 L 100 225 z" fill="#00ffff" fill-opacity=".5" />
<path id="Red50" d="M 0 125 L 0 225 L 100 125 z" fill="#ff00ff" fill-opacity=".5" />
<g id="TwoBlueTriangles">
<use xlink:href="#Blue100"/>
<use xlink:href="#Blue50"/>
</g>
<g id="BlueTriangles">
<use transform="translate(275,25)" xlink:href="#TwoBlueTriangles"/>
<use transform="translate(400,25)" xlink:href="#TwoBlueTriangles"/>
<use transform="translate(525,25)" xlink:href="#TwoBlueTriangles"/>
<use transform="translate(650,25)" xlink:href="#TwoBlueTriangles"/>
<use transform="translate(775,25)" xlink:href="#TwoBlueTriangles"/>
<use transform="translate(900,25)" xlink:href="#TwoBlueTriangles"/>
</g>
</defs>
<rect fill="none" stroke="blue" x="1" y="1" width="1098" height="648"/>
<g font-family="Verdana" font-size="40" shape-rendering="crispEdges">
<desc>Render the examples using the filters that draw on top of
an opaque white surface, thus obliterating the background.</desc>
<g enable-background="new">
<text x="15" y="75">opacity 1.0</text>
<text x="15" y="115" font-size="27">(with feFlood)</text>
<text x="15" y="200">opacity 0.5</text>
<text x="15" y="240" font-size="27">(with feFlood)</text>
<use xlink:href="#BlueTriangles"/>
<g transform="translate(275,25)">
<use xlink:href="#Red100" filter="url(#overFlood)" />
<use xlink:href="#Red50" filter="url(#overFlood)" />
<text x="5" y="275">over</text>
</g>
<g transform="translate(400,25)">
<use xlink:href="#Red100" filter="url(#inFlood)" />
<use xlink:href="#Red50" filter="url(#inFlood)" />
<text x="35" y="275">in</text>
</g>
<g transform="translate(525,25)">
<use xlink:href="#Red100" filter="url(#outFlood)" />
<use xlink:href="#Red50" filter="url(#outFlood)" />
<text x="15" y="275">out</text>
</g>
<g transform="translate(650,25)">
<use xlink:href="#Red100" filter="url(#atopFlood)" />
<use xlink:href="#Red50" filter="url(#atopFlood)" />
<text x="10" y="275">atop</text>
</g>
<g transform="translate(775,25)">
<use xlink:href="#Red100" filter="url(#xorFlood)" />
<use xlink:href="#Red50" filter="url(#xorFlood)" />
<text x="15" y="275">xor</text>
</g>
<g transform="translate(900,25)">
<use xlink:href="#Red100" filter="url(#arithmeticFlood)" />
<use xlink:href="#Red50" filter="url(#arithmeticFlood)" />
<text x="-25" y="275">arithmetic</text>
</g>
</g>
<g transform="translate(0,325)" enable-background="new">
<desc>Render the examples using the filters that do not obliterate
the background, thus sometimes causing the background to continue
to appear in some cases, and in other cases the background
image blends into itself ("double-counting").</desc>
<text x="15" y="75">opacity 1.0</text>
<text x="15" y="115" font-size="27">(without feFlood)</text>
<text x="15" y="200">opacity 0.5</text>
<text x="15" y="240" font-size="27">(without feFlood)</text>
<use xlink:href="#BlueTriangles"/>
<g transform="translate(275,25)">
<use xlink:href="#Red100" filter="url(#overNoFlood)" />
<use xlink:href="#Red50" filter="url(#overNoFlood)" />
<text x="5" y="275">over</text>
</g>
<g transform="translate(400,25)">
<use xlink:href="#Red100" filter="url(#inNoFlood)" />
<use xlink:href="#Red50" filter="url(#inNoFlood)" />
<text x="35" y="275">in</text>
</g>
<g transform="translate(525,25)">
<use xlink:href="#Red100" filter="url(#outNoFlood)" />
<use xlink:href="#Red50" filter="url(#outNoFlood)" />
<text x="15" y="275">out</text>
</g>
<g transform="translate(650,25)">
<use xlink:href="#Red100" filter="url(#atopNoFlood)" />
<use xlink:href="#Red50" filter="url(#atopNoFlood)" />
<text x="10" y="275">atop</text>
</g>
<g transform="translate(775,25)">
<use xlink:href="#Red100" filter="url(#xorNoFlood)" />
<use xlink:href="#Red50" filter="url(#xorNoFlood)" />
<text x="15" y="275">xor</text>
</g>
<g transform="translate(900,25)">
<use xlink:href="#Red100" filter="url(#arithmeticNoFlood)" />
<use xlink:href="#Red50" filter="url(#arithmeticNoFlood)" />
<text x="-25" y="275">arithmetic</text>
</g>
</g>
</g>
</svg>
</pre>
</div>
<div class="exampleimage">
<img src="examples/feComposite.png" alt="Rendering of feComposite.svg" />
</div>
</div>
<h2 id="feConvolveMatrixElement">12 Filter primitive <span class="element-name">'feConvolveMatrix'</span></h2>
<p>feConvolveMatrix applies a matrix convolution filter effect. A convolution
combines pixels in the input image with neighboring pixels to produce a
resulting image. A wide variety of imaging operations can be achieved through
convolutions, including blurring, edge detection, sharpening, embossing and
beveling.</p>
<p>A matrix convolution is based on an n-by-m matrix (the convolution kernel)
which describes how a given pixel value in the input image is combined with
its neighboring pixel values to produce a resulting pixel value. Each result
pixel is determined by applying the kernel matrix to the corresponding source
pixel and its neighboring pixels. The basic convolution formula which is
applied to each color value for a given pixel is:</p>
<p class="filterformula">RESULT<sub>X,Y</sub> = ( <br></br>
SUM <sub>I=0 to [<a href="#feConvolveMatrixElementOrderAttribute">orderY</a>-1]</sub> { <br></br>
SUM <sub>J=0 to [<a href="#feConvolveMatrixElementOrderAttribute">orderX</a>-1]</sub> { <br></br>
SOURCE <sub>X-<a href="#feConvolveMatrixElementTargetXAttribute">targetX</a>+J, Y-<a href="#feConvolveMatrixElementTargetYAttribute">targetY</a>+I</sub> * <a href="#feConvolveMatrixElementKernelMatrixAttribute">kernelMatrix</a><sub><a href="#feConvolveMatrixElementOrderAttribute">orderX</a>-J-1, <a href="#feConvolveMatrixElementOrderAttribute">orderY</a>-I-1</sub> <br></br>
} <br></br>
} <br></br>
) / <a href="#feConvolveMatrixElementDivisorAttribute">divisor</a> + <a href="#feConvolveMatrixElementBiasAttribute">bias</a><br></br>
</p>
<div class="note-editor">
ED: Consider making this into mathml</div>
<p>where "orderX" and "orderY" represent the X and Y values for the <a href="#feConvolveMatrixElementOrderAttribute"><span class="attr-name">order</span></a> attribute, "targetX" represents the value
of the <a href="#feConvolveMatrixElementTargetXAttribute"><span class="attr-name">targetX</span></a> attribute, "targetY" represents the
value of the <a href="#feConvolveMatrixElementTargetYAttribute"><span class="attr-name">targetY</span></a> attribute, "kernelMatrix" represents the
value of the <a href="#feConvolveMatrixElementKernelMatrixAttribute"><span class="attr-name">kernelMatrix</span></a> attribute, "divisor" represents the
value of the <a href="#feConvolveMatrixElementDivisorAttribute"><span class="attr-name">divisor</span></a> attribute, and "bias" represents the
value of the <a href="#feConvolveMatrixElementBiasAttribute"><span class="attr-name">bias</span></a> attribute.</p>
<p>Note in the above formulas that the values in the kernel matrix are
applied such that the kernel matrix is rotated 180 degrees relative to the
source and destination images in order to match convolution theory as
described in many computer graphics textbooks.</p>
<p>To illustrate, suppose you have a input image which is 5 pixels by 5
pixels, whose color values for one of the color channels are as follows:</p>
<pre> 0 20 40 235 235
100 120 140 235 235
200 220 240 235 235
225 225 255 255 255
225 225 255 255 255</pre>
<div class="note-editor">
ED: Consider making this into mathml</div>
<p>and you define a 3-by-3 convolution kernel as follows:</p>
<pre> 1 2 3
4 5 6
7 8 9</pre>
<div class="note-editor">
ED: Consider making this into mathml</div>
<p>Let's focus on the color value at the second row and second column of the
image (source pixel value is 120). Assuming the simplest case (where the
input image's pixel grid aligns perfectly with the kernel's pixel grid) and
assuming default values for attributes <span class="attr-name">divisor</span>, <span class="attr-name">targetX</span> and
<span class="attr-name">targetY</span>, then resulting color value will
be:</p>
<pre>(9* 0 + 8* 20 + 7* 40 +
6*100 + 5*120 + 4*140 +
3*200 + 2*220 + 1*240) / (9+8+7+6+5+4+3+2+1)</pre>
<div class="note-editor">
ED: Consider making this into mathml</div>
<p>Because they operate on pixels, matrix convolutions are inherently
resolution-dependent. To make <span class="element-name">'feConvolveMatrix</span> produce resolution-independent
results, an explicit value should be provided for either the <a href="#FilterElementFilterResAttribute"><span class="attr-name">filterRes</span></a> attribute on the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element
and/or attribute <span class="attr-name">kernelUnitLength</span>.</p>
<p><a href="#feConvolveMatrixElementKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a>, in combination with the other
attributes, defines an implicit pixel grid in the filter effects coordinate
system (i.e., the coordinate system established by the <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> attribute). If the pixel grid
established by <a href="#feConvolveMatrixElementKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a> is not scaled to match the
pixel grid established by attribute <a href="#FilterElementFilterResAttribute"><span class="attr-name">filterRes</span></a> (implicitly or explicitly), then the
input image will be temporarily rescaled to match its pixels with <a href="#feConvolveMatrixElementKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a>. The convolution happens on the
resampled image. After applying the convolution, the image is resampled back
to the original resolution.</p>
<p>When the image must be resampled to match the coordinate system defined by
<a href="#feConvolveMatrixElementKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a> prior to convolution, or
resampled to match the device coordinate system after convolution, it is
recommended that high quality viewers make use of appropriate interpolation
techniques, for example bilinear or bicubic. Depending on the speed of the
available interpolents, this choice may be affected by the <span class="prop-name">'image-rendering'</span> property setting. Note that
implementations might choose approaches that minimize or eliminate resampling
when not necessary to produce proper results, such as when the document is
zoomed out such that <span class="attr-name">kernelUnitLength</span> is
considerably smaller than a device pixel.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feConvolveMatrixElementOrderAttribute" name="feConvolveMatrixElementOrderAttribute"></a> <span class="adef">order</span> = "<span class="attr-value"><number-optional-number></span>"</dt>
<dd>Indicates the number of cells in each dimension for <span class="attr-name">kernelMatrix</span>. The values provided must be
<integer>
s greater than zero. The first number, <orderX>, indicates the
number of columns in the matrix. The second number, <orderY>,
indicates the number of rows in the matrix. If <orderY> is not
provided, it defaults to <orderX>.<br></br>
A typical value is order="3". It is recommended that only small values
(e.g., 3) be used; higher values may result in very high CPU overhead
and usually do not produce results that justify the impact on
performance.<br></br>
If the attribute is not specified, the effect is as if a value of "3"
were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feConvolveMatrixElementKernelMatrixAttribute" name="feConvolveMatrixElementKernelMatrixAttribute"></a> <span class="adef">kernelMatrix</span> = "<span class="attr-value"><list of
numbers></span>"</dt>
<dd>The list of <number>
s that make up the kernel matrix for the convolution. Values are
separated by space characters and/or a comma. The number of entries in
the list must equal <orderX> times <orderY>.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feConvolveMatrixElementDivisorAttribute" name="feConvolveMatrixElementDivisorAttribute"></a> <span class="adef">divisor</span> = "<span class="attr-value"><number></span>"</dt>
<dd>After applying the <span class="attr-name">kernelMatrix</span> to the
input image to yield a number, that number is divided by <span class="attr-name">divisor</span> to yield the final destination color
value. A divisor that is the sum of all the matrix values tends to have
an evening effect on the overall color intensity of the result. If the
specified divisor is zero then the default value will be used instead.
The default value is the sum of all values in kernelMatrix, with the
exception that if the sum is zero, then the divisor is set to 1.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feConvolveMatrixElementBiasAttribute" name="feConvolveMatrixElementBiasAttribute"></a> <span class="adef">bias</span> = "<span class="attr-value"><number></span>"</dt>
<dd>After applying the <span class="attr-name">kernelMatrix</span> to the
input image to yield a number and applying the <a href="#feConvolveMatrixElementDivisorAttribute"><span class="attr-name">divisor</span></a>, the <span class="attr-name">bias</span> attribute is added to each component. One
application of <span class="attr-name">bias</span> is when it is
desirable to have .5 gray value be the zero response of the filter. If
<span class="attr-name">bias</span> is not specified, then the effect
is as if a value of zero were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feConvolveMatrixElementTargetXAttribute" name="feConvolveMatrixElementTargetXAttribute"></a> <span class="adef">targetX</span> = "<span class="attr-value"><integer></span>"</dt>
<dd>Determines the positioning in X of the convolution matrix relative to
a given target pixel in the input image. The leftmost column of the
matrix is column number zero. The value must be such that: 0 <=
targetX < orderX. By default, the convolution matrix is centered in
X over each pixel of the input image (i.e., targetX = floor ( orderX /
2 )).<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feConvolveMatrixElementTargetYAttribute" name="feConvolveMatrixElementTargetYAttribute"></a> <span class="adef">targetY</span> = "<span class="attr-value"><integer></span>"</dt>
<dd>Determines the positioning in Y of the convolution matrix relative to
a given target pixel in the input image. The topmost row of the matrix
is row number zero. The value must be such that: 0 <= targetY <
orderY. By default, the convolution matrix is centered in Y over each
pixel of the input image (i.e., targetY = floor ( orderY / 2 )).<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feConvolveMatrixElementEdgeModeAttribute" name="feConvolveMatrixElementEdgeModeAttribute"></a> <span class="adef">edgeMode</span> = "<span class="attr-value">duplicate | wrap |
none</span>"</dt>
<dd><p>Determines how to extend the input image as necessary with color
values so that the matrix operations can be applied when the kernel is
positioned at or near the edge of the input image.</p>
<p>"duplicate" indicates that the input image is extended along each of
its borders as necessary by duplicating the color values at the given
edge of the input image.</p>
<pre>Original N-by-M image, where m=M-1 and n=N-1:
11 12 ... 1m 1M
21 22 ... 2m 2M
.. .. ... .. ..
n1 n2 ... nm nM
N1 N2 ... Nm NM
Extended by two pixels using "duplicate":
11 11 11 12 ... 1m 1M 1M 1M
11 11 11 12 ... 1m 1M 1M 1M
11 11 11 12 ... 1m 1M 1M 1M
21 21 21 22 ... 2m 2M 2M 2M
.. .. .. .. ... .. .. .. ..
n1 n1 n1 n2 ... nm nM nM nM
N1 N1 N1 N2 ... Nm NM NM NM
N1 N1 N1 N2 ... Nm NM NM NM
N1 N1 N1 N2 ... Nm NM NM NM</pre>
<div class="note-editor">
ED: Consider making this into mathml</div>
<p>"wrap" indicates that the input image is extended by taking the
color values from the opposite edge of the image.</p>
<pre>Extended by two pixels using "wrap":
nm nM n1 n2 ... nm nM n1 n2
Nm NM N1 N2 ... Nm NM N1 N2
1m 1M 11 12 ... 1m 1M 11 12
2m 2M 21 22 ... 2m 2M 21 22
.. .. .. .. ... .. .. .. ..
nm nM n1 n2 ... nm nM n1 n2
Nm NM N1 N2 ... Nm NM N1 N2
1m 1M 11 12 ... 1m 1M 11 12
2m 2M 21 22 ... 2m 2M 21 22</pre>
<div class="note-editor">
ED: Consider making this into mathml</div>
<p>"none" indicates that the input image is extended with pixel values
of zero for R, G, B and A.</p>
<p><span class="anim-target">Animatable:yes.</span></p>
</dd>
<dt><a id="feConvolveMatrixElementKernelUnitLengthAttribute" name="feConvolveMatrixElementKernelUnitLengthAttribute"></a> <span class="adef">kernelUnitLength</span> = "<span class="attr-value"><number-optional-number></span>"</dt>
<dd>The first number is the <dx> value. The second number is the
<dy> value. If the <dy> value is not specified, it defaults
to the same value as <dx>. Indicates the intended distance in
current filter units (i.e., units as determined by the value of
attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a>) between successive columns
and rows, respectively, in the <span class="attr-name">kernelMatrix</span>. By specifying value(s) for <span class="attr-name">kernelUnitLength</span>, the kernel becomes defined
in a scalable, abstract coordinate system. If <span class="attr-name">kernelUnitLength</span> is not specified, the default
value is one pixel in the offscreen bitmap, which is a pixel-based
coordinate system, and thus potentially not scalable. For some level of
consistency across display media and user agents, it is necessary that
a value be provided for at least one of <span class="attr-name">filterRes</span> and <span class="attr-name">kernelUnitLength</span>. In some implementations, the
most consistent results and the fastest performance will be achieved if
the pixel grid of the temporary offscreen images aligns with the pixel
grid of the kernel.<br></br>
If a negative or zero value is specified the default value will be used
instead. <br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feConvolveMatrixElementPreserveAlphaAttribute" name="feConvolveMatrixElementPreserveAlphaAttribute"></a> <span class="adef">preserveAlpha</span> = "<span class="attr-value">false |
true</span>"</dt>
<dd>A value of <span class="attr-value">false</span> indicates that the
convolution will apply to all channels, including the alpha channel.<br></br>
A value of <span class="attr-value">true</span> indicates that the
convolution will only apply to the color channels. In this case, the
filter will temporarily unpremultiply the color component values, apply
the kernel, and then re-premultiply at the end.<br></br>
If <span class="attr-name">preserveAlpha</span> is not specified, then
the effect is as if a value of <span class="attr-value">false</span>
were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<h2 id="feDiffuseLightingElement">13 Filter primitive <span class="element-name">'feDiffuseLighting'</span></h2>
<p>This filter primitive lights an image using the alpha channel as a bump
map. The resulting image is an RGBA opaque image based on the light color
with alpha = 1.0 everywhere. The lighting calculation follows the standard
diffuse component of the Phong lighting model. The resulting image depends on
the light color, light position and surface geometry of the input bump
map.</p>
<p>The light map produced by this filter primitive can be combined with a
texture image using the multiply term of the <em>arithmetic</em> <a href="#feCompositeElement"><span class="element-name">'feComposite'</span></a> compositing method. Multiple
light sources can be simulated by adding several of these light maps together
before applying it to the texture image.</p>
<p>The formulas below make use of 3x3 filters. Because they operate on
pixels, such filters are inherently resolution-dependent. To make <span class="element-name">'feDiffuseLighting'</span> produce
resolution-independent results, an explicit value should be provided for
either the <a href="#FilterElementFilterResAttribute"><span class="attr-name">filterRes</span></a> attribute on the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element
and/or attribute <span class="attr-name">kernelUnitLength</span>.</p>
<p><a href="#feDiffuseLightingKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a>, in combination with the other
attributes, defines an implicit pixel grid in the filter effects coordinate
system (i.e., the coordinate system established by the <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> attribute). If the pixel grid
established by <a href="#feDiffuseLightingKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a> is not scaled to match the
pixel grid established by attribute <a href="#FilterElementFilterResAttribute"><span class="attr-name">filterRes</span></a> (implicitly or explicitly), then the
input image will be temporarily rescaled to match its pixels with <a href="#feDiffuseLightingKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a>. The 3x3 filters are applied to
the resampled image. After applying the filter, the image is resampled back
to its original resolution.</p>
<p>When the image must be resampled, it is recommended that high quality
viewers make use of appropriate interpolation techniques, for example
bilinear or bicubic. Depending on the speed of the available interpolents,
this choice may be affected by the <span class="prop-name">'image-rendering'</span> property setting. Note that
implementations might choose approaches that minimize or eliminate resampling
when not necessary to produce proper results, such as when the document is
zoomed out such that <span class="attr-name">kernelUnitLength</span> is
considerably smaller than a device pixel.</p>
<p>For the formulas that follow, the
<code>Norm(A<sub>x</sub>,A<sub>y</sub>,A<sub>z</sub>)</code> function is
defined as:</p>
<div class="note-editor">
ED: Consider making the following in mathml</div>
<p class="filterformula">Norm(A<sub>x</sub>,A<sub>y</sub>,A<sub>z</sub>) =
sqrt(A<sub>x</sub>^2+A<sub>y</sub>^2+A<sub>z</sub>^2)</p>
<p>The resulting RGBA image is computed as follows:</p>
<p class="filterformula">D<sub>r</sub> = k<sub>d</sub> * N.L *
L<sub>r</sub><br></br>
D<sub>g</sub> = k<sub>d</sub> * N.L * L<sub>g</sub><br></br>
D<sub>b</sub> = k<sub>d</sub> * N.L * L<sub>b</sub><br></br>
D<sub>a</sub> = 1.0</p>
<p>where</p>
<dl>
<dd>k<sub>d</sub> = diffuse lighting constant<br></br>
N = surface normal unit vector, a function of x and y<br></br>
L = unit vector pointing from surface to light, a function of x and y
in the point and spot light cases<br></br>
L<sub>r</sub>,L<sub>g</sub>,L<sub>b</sub> = RGB components of light, a
function of x and y in the spot light case</dd>
</dl>
<p>N is a function of x and y and depends on the surface gradient as
follows:</p>
<p>The surface described by the input alpha image A<sub>in</sub> (x,y) is:</p>
<p class="filterformula">Z (x,y) = surfaceScale * A<sub>in</sub> (x,y)</p>
<a class="indexref-feDiffuseLighting::surface_normal_calculations" name="SurfaceNormalCalculations" id="SurfaceNormalCalculations"></a>
<p>Surface normal is calculated using the Sobel gradient 3x3 filter.
Different filter kernels are used depending on whether the given pixel is on
the interior or an edge. For each case, the formula is:</p>
<p class="filterformula">N<sub>x</sub> (x,y)= - surfaceScale *
FACTOR<sub>x</sub> *<br></br>
(K <sub>x</sub>(0,0)*I(x-dx,y-dy) +
K<sub>x</sub>(1,0)*I(x,y-dy) + K<sub>x</sub>(2,0)*I(x+dx,y-dy) +<br></br>
K <sub>x</sub>(0,1)*I(x-dx,y) +
K<sub>x</sub>(1,1)*I(x,y) + K<sub>x</sub>(2,1)*I(x+dx,y) +<br></br>
K <sub>x</sub>(0,2)*I(x-dx,y+dy) +
K<sub>x</sub>(1,2)*I(x,y+dy) + K<sub>x</sub>(2,2)*I(x+dx,y+dy))<br></br>
N<sub>y</sub> (x,y)= - surfaceScale * FACTOR<sub>y</sub> *<br></br>
(K <sub>y</sub>(0,0)*I(x-dx,y-dy) +
K<sub>y</sub>(1,0)*I(x,y-dy) + K<sub>y</sub>(2,0)*I(x+dx,y-dy) +<br></br>
K <sub>y</sub>(0,1)*I(x-dx,y) +
K<sub>y</sub>(1,1)*I(x,y) + K<sub>y</sub>(2,1)*I(x+dx,y) +<br></br>
K <sub>y</sub>(0,2)*I(x-dx,y+dy) +
K<sub>y</sub>(1,2)*I(x,y+dy) + K<sub>y</sub>(2,2)*I(x+dx,y+dy))<br></br>
N<sub>z</sub> (x,y) = 1.0<br></br>
<br></br>
N = (N<sub>x</sub>, N<sub>y</sub>, N<sub>z</sub>) /
Norm((N<sub>x</sub>,N<sub>y</sub>,N<sub>z</sub>))</p>
<p>In these formulas, the <code>dx</code> and <code>dy</code> values (e.g.,
<code>I(x-dx,y-dy)</code>), represent deltas relative to a given
<code>(x,y)</code> position for the purpose of estimating the slope of the
surface at that point. These deltas are determined by the value (explicit or
implicit) of attribute <a href="#feDiffuseLightingKernelUnitLengthAttribute"><span class="attr-name">kernelUnitLength</span></a>.</p>
<table border="1" summary="feDiffuseLighting formulas">
<colgroup><col width="33.3%"></col><col width="33.3%"></col><col width="*"></col></colgroup>
<tbody>
<tr>
<td><p>Top/left corner:</p>
<p class="filterformula">FACTOR<sub>x</sub>=2/(3*dx)<br></br>
K<sub>x</sub> =<br></br>
| 0 0 0 |<br></br>
| 0 -2 2 |<br></br>
| 0 -1 1 |<br></br>
<br></br>
FACTOR<sub>y</sub>=2/(3*dy)<br></br>
K<sub>y</sub> = <br></br>
| 0 0 0 |<br></br>
| 0 -2 -1 |<br></br>
| 0 2 1 |</p>
</td>
<td><p>Top row:</p>
<p class="filterformula">FACTOR<sub>x</sub>=1/(3*dx)<br></br>
K<sub>x</sub> =<br></br>
| 0 0 0 |<br></br>
| -2 0 2 |<br></br>
| -1 0 1 |<br></br>
<br></br>
FACTOR<sub>y</sub>=1/(2*dy)<br></br>
K<sub>y</sub> = <br></br>
| 0 0 0 |<br></br>
| -1 -2 -1 |<br></br>
| 1 2 1 |</p>
</td>
<td><p>Top/right corner:</p>
<p class="filterformula">FACTOR<sub>x</sub>=2/(3*dx)<br></br>
K<sub>x</sub> =<br></br>
| 0 0 0 |<br></br>
| -2 2 0 |<br></br>
| -1 1 0 |<br></br>
<br></br>
FACTOR<sub>y</sub>=2/(3*dy)<br></br>
K<sub>y</sub> = <br></br>
| 0 0 0 |<br></br>
| -1 -2 0 |<br></br>
| 1 2 0 |</p>
</td>
</tr>
<tr>
<td><p>Left column:</p>
<p class="filterformula">FACTOR<sub>x</sub>=1/(2*dx)<br></br>
K<sub>x</sub> =<br></br>
| 0 -1 1 |<br></br>
| 0 -2 2 |<br></br>
| 0 -1 1 |<br></br>
<br></br>
FACTOR<sub>y</sub>=1/(3*dy)<br></br>
K<sub>y</sub> = <br></br>
| 0 -2 -1 |<br></br>
| 0 0 0 |<br></br>
| 0 2 1 |</p>
</td>
<td><p>Interior pixels:</p>
<p class="filterformula">FACTOR<sub>x</sub>=1/(4*dx)<br></br>
K<sub>x</sub> =<br></br>
| -1 0 1 |<br></br>
| -2 0 2 |<br></br>
| -1 0 1 |<br></br>
<br></br>
FACTOR<sub>y</sub>=1/(4*dy)<br></br>
K<sub>y</sub> = <br></br>
| -1 -2 -1 |<br></br>
| 0 0 0 |<br></br>
| 1 2 1 |</p>
</td>
<td><p>Right column:</p>
<p class="filterformula">FACTOR<sub>x</sub>=1/(2*dx)<br></br>
K<sub>x</sub> =<br></br>
| -1 1 0|<br></br>
| -2 2 0|<br></br>
| -1 1 0|<br></br>
<br></br>
FACTOR<sub>y</sub>=1/(3*dy)<br></br>
K<sub>y</sub> = <br></br>
| -1 -2 0 |<br></br>
| 0 0 0 |<br></br>
| 1 2 0 |</p>
</td>
</tr>
<tr>
<td><p>Bottom/left corner:</p>
<p class="filterformula">FACTOR<sub>x</sub>=2/(3*dx)<br></br>
K<sub>x</sub> =<br></br>
| 0 -1 1 |<br></br>
| 0 -2 2 |<br></br>
| 0 0 0 |<br></br>
<br></br>
FACTOR<sub>y</sub>=2/(3*dy)<br></br>
K<sub>y</sub> = <br></br>
| 0 -2 -1 |<br></br>
| 0 2 1 |<br></br>
| 0 0 0 |</p>
</td>
<td><p>Bottom row:</p>
<p class="filterformula">FACTOR<sub>x</sub>=1/(3*dx)<br></br>
K<sub>x</sub> =<br></br>
| -1 0 1 |<br></br>
| -2 0 2 |<br></br>
| 0 0 0 |<br></br>
<br></br>
FACTOR<sub>y</sub>=1/(2*dy)<br></br>
K<sub>y</sub> = <br></br>
| -1 -2 -1 |<br></br>
| 1 2 1 |<br></br>
| 0 0 0 |</p>
</td>
<td><p>Bottom/right corner:</p>
<p class="filterformula">FACTOR<sub>x</sub>=2/(3*dx)<br></br>
K<sub>x</sub> =<br></br>
| -1 1 0 |<br></br>
| -2 2 0 |<br></br>
| 0 0 0 |<br></br>
<br></br>
FACTOR<sub>y</sub>=2/(3*dy)<br></br>
K<sub>y</sub> = <br></br>
| -1 -2 0 |<br></br>
| 1 2 0 |<br></br>
| 0 0 0 |</p>
</td>
</tr>
</tbody>
</table>
<p>L, the unit vector from the image sample to the light, is calculated as
follows:</p>
<p>For Infinite light sources it is constant:</p>
<p class="filterformula">L<sub>x</sub> = cos(azimuth)*cos(elevation)<br></br>
L<sub>y</sub> = sin(azimuth)*cos(elevation)<br></br>
L<sub>z</sub> = sin(elevation)</p>
<p>For Point and spot lights it is a function of position:</p>
<p class="filterformula">L<sub>x</sub> = Light<sub>x</sub> - x<br></br>
L<sub>y</sub> = Light<sub>y</sub> - y<br></br>
L<sub>z</sub> = Light<sub>z</sub> - Z(x,y)<br></br>
<br></br>
L = (L<sub>x</sub>, L<sub>y</sub>, L<sub>z</sub>) / Norm(L<sub>x</sub>,
L<sub>y</sub>, L<sub>z</sub>)</p>
<p>where Light<sub>x</sub>, Light<sub>y</sub>, and Light<sub>z</sub> are the
input light position.</p>
<p>L<sub>r</sub>,L<sub>g</sub>,L<sub>b</sub>, the light color vector, is a
function of position in the spot light case only:</p>
<p class="filterformula">L<sub>r</sub> =
Light<sub>r</sub>*pow((-L.S),specularExponent)<br></br>
L<sub>g</sub> = Light<sub>g</sub>*pow((-L.S),specularExponent)<br></br>
L<sub>b</sub> = Light<sub>b</sub>*pow((-L.S),specularExponent)</p>
<p>where S is the unit vector pointing from the light to the point
(pointsAtX, pointsAtY, pointsAtZ) in the x-y plane:</p>
<p class="filterformula">S<sub>x</sub> = pointsAtX - Light<sub>x</sub><br></br>
S<sub>y</sub> = pointsAtY - Light<sub>y</sub><br></br>
S<sub>z</sub> = pointsAtZ - Light<sub>z</sub><br></br>
<br></br>
S = (S<sub>x</sub>, S<sub>y</sub>, S<sub>z</sub>) / Norm(S<sub>x</sub>,
S<sub>y</sub>, S<sub>z</sub>)</p>
<p>If L.S is positive, no light is present. (L<sub>r</sub> = L<sub>g</sub> =
L<sub>b</sub> = 0)</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feDiffuseLightingSurfaceScaleAttribute" name="feDiffuseLightingSurfaceScaleAttribute"></a> <span class="adef">surfaceScale</span> = "<em><number></em>"</dt>
<dd>height of surface when A<sub>in</sub> = 1.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDiffuseLightingDiffuseConstantAttribute" name="feDiffuseLightingDiffuseConstantAttribute"></a> <span class="adef">diffuseConstant</span> = "<em><number></em>"</dt>
<dd>kd in Phong lighting model. In SVG, this can be any non-negative
number.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDiffuseLightingKernelUnitLengthAttribute" name="feDiffuseLightingKernelUnitLengthAttribute"></a> <span class="adef">kernelUnitLength</span> = "<span class="attr-value"><number-optional-number></span>"</dt>
<dd>The first number is the <dx> value. The second number is the
<dy> value. If the <dy> value is not specified, it defaults
to the same value as <dx>. Indicates the intended distance in
current filter units (i.e., units as determined by the value of
attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a>) for <code>dx</code> and
<code>dy</code>, respectively, in the <a href="#SurfaceNormalCalculations">surface normal calculation
formulas</a>. By specifying value(s) for <span class="attr-name">kernelUnitLength</span>, the kernel becomes defined
in a scalable, abstract coordinate system. If <span class="attr-name">kernelUnitLength</span> is not specified, the
<code>dx</code> and <code>dy</code> values should represent very small
deltas relative to a given <code>(x,y)</code> position, which might be
implemented in some cases as one pixel in the intermediate image
offscreen bitmap, which is a pixel-based coordinate system, and thus
potentially not scalable. For some level of consistency across display
media and user agents, it is necessary that a value be provided for at
least one of <span class="attr-name">filterRes</span> and <span class="attr-name">kernelUnitLength</span>. Discussion of intermediate
images are in the <a href="#introduction">Introduction</a> and in the
description of attribute <a href="#FilterElementFilterResAttribute"><span class="attr-name">filterRes</span></a>.<br></br>
If a negative or zero value is specified the default value will be used
instead. <br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<p>The light source is defined by one of the child elements <a href="#feDistantLightElement"><span class="element-name">'feDistantLight'</span></a>, <a href="#fePointLightElement"><span class="element-name">'fePointLight'</span></a> or <a href="#feSpotLightElement"><span class="element-name">'feSpotLight'</span></a>. The light color is specified
by property <a href="#LightingColorProperty"><span class="prop-name">'lighting-color'</span></a>.</p>
<h2 id="feDisplacementMapElement">14 Filter primitive <span class="element-name">'feDisplacementMap'</span></h2>
<p>This filter primitive uses the pixels values from the image from <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a>
to spatially displace the image from <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a>.
This is the transformation to be performed:</p>
<div class="changed">
<pre> P'(x,y) ← P( x + scale * (XC(x,y) - .5), y + scale * (YC(x,y) - .5))
</pre>
</div>
<p>where P(x,y) is the input image, <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a>, and
P'(x,y) is the destination. XC(x,y) and YC(x,y) are the component values of
the designated by the <em>xChannelSelector</em> and
<em>yChannelSelector</em>. For example, to use the R component of <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a>
to control displacement in x and the G component of Image2 to control
displacement in y, set <em>xChannelSelector</em> to "R" and
<em>yChannelSelector</em> to "G".</p>
<div class="changed">
<p>The displacement map, <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a>, defines the inverse of the mapping
performed.</p>
</div>
<p>The calculations using the pixel values from <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a>
are performed using non-premultiplied color values. If the image from <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a>
consists of premultiplied color values, those values are automatically
converted into non-premultiplied color values before performing this
operation.</p>
<p>This filter can have arbitrary non-localized effect on the input which
might require substantial buffering in the processing pipeline. However with
this formulation, any intermediate buffering needs can be determined by
<em>scale</em> which represents the maximum range of displacement in either x
or y.</p>
<p>When applying this filter, the source pixel location will often lie
between several source pixels. In this case it is recommended that high
quality viewers apply an interpolent on the surrounding pixels, for example
bilinear or bicubic, rather than simply selecting the nearest source pixel.
Depending on the speed of the available interpolents, this choice may be
affected by the <span class="prop-name">'image-rendering'</span> property
setting.</p>
<p>The <span class="prop-name">'color-interpolation-filters'</span> property
only applies to the <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a> source image and does not apply to the <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a>
source image.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feDisplacementMapScaleAttribute" name="feDisplacementMapScaleAttribute"></a> <span class="adef">scale</span>
= "<em><number></em>"</dt>
<dd>Displacement scale factor. The amount is expressed in the coordinate
system established by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
When the value of this attribute is <span class="attr-value">0</span>,
this operation has no effect on the source image.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDisplacementMapXChannelSelectorAttribute" name="feDisplacementMapXChannelSelectorAttribute"></a> <span class="adef">xChannelSelector</span> = "<em>R | G | B | A</em>"</dt>
<dd>Indicates which channel from <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a> to use to displace the pixels in <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> along the x-axis.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDisplacementMapYChannelSelectorAttribute" name="feDisplacementMapYChannelSelectorAttribute"></a> <span class="adef">yChannelSelector</span> = "<em>R | G | B | A</em>"</dt>
<dd>Indicates which channel from <a href="#feDisplacementMapIn2Attribute"><span class="attr-name">in2</span></a> to use to displace the pixels in <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> along the y-axis.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDisplacementMapIn2Attribute" name="feDisplacementMapIn2Attribute"></a> <span class="adef">in2</span> =
"<em>(see <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> attribute)</em>"</dt>
<dd>The second input image, which is used to displace the pixels in the
image from attribute <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a>. This attribute can take on the same
values as the <a href="#FilterPrimitiveInAttribute"><span class="attr-name">in</span></a> attribute.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<h2 id="feFloodElement">15 Filter primitive <span class="element-name">'feFlood'</span></h2>
<p>This filter primitive creates a rectangle filled with the color and
opacity values from properties <span class="prop-name">'flood-color'</span>
and <span class="prop-name">'flood-opacity'</span>. The rectangle is as large
as the <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>
established by the <span class="element-name">'feFlood'</span> element.</p>
<div class="adef-list">
</div>
<p>The <span class="prop-name">'flood-color'</span> property indicates what
color to use to flood the current <a href="#FilterPrimitiveSubRegion">filter
primitive subregion</a>. The keyword <span class="attr-value">currentColor</span> and ICC colors can be specified in the
same manner as within a <paint> specification for the <span class="prop-name">'fill'</span> and <span class="prop-name">'stroke'</span>
properties.</p>
<a class="indexref-flood-color#Q#_property" id="FloodColorProperty" name="FloodColorProperty"></a>
<div class="propdef">
<dl>
<dt><span class="index-def" title="'margin-top'"><a class="propdef-title" id="propdef-flood-color" name="propdef-flood-color"><span class="prop-name">'flood-color'</span></a></span></dt>
<dd>
<table cellpadding="0" cellspacing="0" class="propinfo" summary="flood-color property">
<tbody>
<tr valign="baseline">
<td><em>Value:</em> </td>
<td>currentColor |<br></br>
<color>
[icc-color(<name>[,<icccolorvalue>]*)] |<br></br>
<a href="http://www.w3.org/TR/REC-CSS2/cascade.html#value-def-inherit" class="noxref"><span class="value-inst-inherit noxref">inherit</span></a></td>
</tr>
<tr valign="baseline">
<td><em>Initial:</em> </td>
<td>black</td>
</tr>
<tr valign="baseline">
<td><em>Applies to:</em> </td>
<td><a href="#feFloodElement"><span class="element-name">'feFlood'</span></a> and <a href="#feDropShadowElement"><span class="element-name">'feDropShadow'</span></a> elements</td>
</tr>
<tr valign="baseline">
<td><em>Inherited:</em> </td>
<td>no</td>
</tr>
<tr valign="baseline">
<td><em>Percentages:</em> </td>
<td>N/A</td>
</tr>
<tr valign="baseline">
<td><em>Media:</em> </td>
<td>visual</td>
</tr>
<tr valign="baseline">
<td><em>Animatable:</em> </td>
<td>yes</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</div>
<p>The <span class="prop-name">'flood-opacity'</span> property defines the
opacity value to use across the entire <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a>.</p>
<a class="indexref-opacity::flood-opacity#Q#_property" id="OpacityFloodOpacityProperty" name="OpacityFloodOpacityProperty"></a> <a class="indexref-flood-opacity#Q#_property" id="FloodOpacityProperty" name="FloodOpacityProperty"></a>
<div class="propdef">
<dl>
<dt><span class="index-def" title="'margin-top'"><a class="propdef-title" id="propdef-flood-opacity" name="propdef-flood-opacity"><span class="prop-name">'flood-opacity'</span></a></span></dt>
<dd>
<table cellpadding="0" cellspacing="0" class="propinfo" summary="flood-opacity property">
<tbody>
<tr valign="baseline">
<td><em>Value:</em> </td>
<td><opacity-value> | <a href="http://www.w3.org/TR/REC-CSS2/cascade.html#value-def-inherit" class="noxref"><span class="value-inst-inherit noxref">inherit</span></a></td>
</tr>
<tr valign="baseline">
<td><em>Initial:</em> </td>
<td>1</td>
</tr>
<tr valign="baseline">
<td><em>Applies to:</em> </td>
<td><a href="#feFloodElement"><span class="element-name">'feFlood'</span></a> and <a href="#feDropShadowElement"><span class="element-name">'feDropShadow'</span></a> elements</td>
</tr>
<tr valign="baseline">
<td><em>Inherited:</em> </td>
<td>no</td>
</tr>
<tr valign="baseline">
<td><em>Percentages:</em> </td>
<td>N/A</td>
</tr>
<tr valign="baseline">
<td><em>Media:</em> </td>
<td>visual</td>
</tr>
<tr valign="baseline">
<td><em>Animatable:</em> </td>
<td>yes</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</div>
<h2 id="feGaussianBlurElement">16 Filter primitive <span class="element-name">'feGaussianBlur'</span></h2>
<p>This filter primitive performs a Gaussian blur on the input image.</p>
<p>The Gaussian blur kernel is an approximation of the normalized
convolution:</p>
<p class="filterformula">H(x) = exp(-x<sup>2</sup>/ (2s<sup>2</sup>)) /
sqrt(2* pi*s<sup>2</sup>)</p>
<p>where 's' is the standard deviation specified by <a href="#feGaussianBlurStdDeviationAttribute"><span class="attr-name">stdDeviation</span></a>.</p>
<p>The value of <a href="#feGaussianBlurStdDeviationAttribute"><span class="attr-name">stdDeviation</span></a> can be either one or two numbers.
If two numbers are provided, the first number represents a standard deviation
value along the x-axis of the current coordinate system and the second value
represents a standard deviation in Y. If one number is provided, then that
value is used for both X and Y.</p>
<p>Even if only one value is provided for <a href="#feGaussianBlurStdDeviationAttribute"><span class="attr-name">stdDeviation</span></a>, this can be implemented as a
separable convolution.</p>
<p>For larger values of 's' (s >= 2.0), an approximation can be used:
Three successive box-blurs build a piece-wise quadratic convolution kernel,
which approximates the Gaussian kernel to within roughly 3%.</p>
<p class="filterformula">let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)</p>
<p>... if d is odd, use three box-blurs of size 'd', centered on the output
pixel.</p>
<p>... if d is even, two box-blurs of size 'd' (the first one centered on the
pixel boundary between the output pixel and the one to the left, the second
one centered on the pixel boundary between the output pixel and the one to
the right) and one box blur of size 'd+1' centered on the output pixel.</p>
<p>Frequently this operation will take place on alpha-only images, such as
that produced by the built-in input, <a href="#SourceAlpha"><span class="attr-value">SourceAlpha</span></a>. The implementation may notice this
and optimize the single channel case. If the input has infinite extent and is
constant, this operation has no effect. If the input has infinite extent and
is a tile, the filter is evaluated with periodic boundary conditions.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feGaussianBlurStdDeviationAttribute" name="feGaussianBlurStdDeviationAttribute"></a> <span class="adef">stdDeviation</span> =
"<em><number-optional-number></em>"</dt>
<dd>The standard deviation for the blur operation. If two <number>
s are provided, the first number represents a standard deviation value
along the x-axis of the coordinate system established by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element. The second value represents a standard deviation in Y. If one
number is provided, then that value is used for both X and Y.<br></br>
A negative or zero value disables the effect of the given filter
primitive (i.e., the result is a transparent black image).<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<p><a href="#AnExample">The example</a> at the start of this chapter makes
use of the <span class="element-name">feGaussianBlur</span> filter primitive
to create a drop shadow effect.</p>
<h2 id="feImageElement">17 Filter primitive <span class="element-name">'feImage'</span></h2>
<p>This filter primitive refers to a graphic external to this filter element,
which is loaded or rendered into an RGBA raster and becomes the result of the
filter primitive.</p>
<p>This filter primitive can refer to an external image or can be a reference
to another piece of SVG. It produces an image similar to the built-in image
source <a href="#SourceGraphic"><span class="attr-value">SourceGraphic</span></a> except that the graphic comes
from an external source.</p>
<p>If the <span class="attr-name">xlink:href</span> references a stand-alone
image resource such as a JPEG, PNG or SVG file, then the image resource is
rendered according to the behavior of the <span class="element-name">'image'</span> element; otherwise, the referenced
resource is rendered according to the behavior of the <span class="element-name">'use'</span> element. In either case, the current user
coordinate system depends on the value of attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a> element.
The processing of the <span class="attr-name">preserveAspectRatio</span>
attribute on the <span class="element-name">'feImage'</span> element is
identical to that of the <a href="/TR/SVGMobile12/struct.html#ImageElement"><span class="element-name">'image'</span></a> element.</p>
<p>When the referenced image must be resampled to match the device coordinate
system, it is recommended that high quality viewers make use of appropriate
interpolation techniques, for example bilinear or bicubic. Depending on the
speed of the available interpolents, this choice may be affected by the <span class="prop-name">'image-rendering'</span> property setting.</p>
<div class="adef-list">
</div>
<h2 id="feMergeElement">18 Filter primitive <span class="element-name">'feMerge'</span></h2>
<p>This filter primitive composites input image layers on top of each other
using the <em>over</em> operator with <em>Input1</em> (corresponding to the
first <a href="#feMergeNodeElement"><span class="element-name">'feMergeNode'</span></a> child element) on the bottom
and the last specified input, <em>InputN</em> (corresponding to the last <a href="#feMergeNodeElement"><span class="element-name">'feMergeNode'</span></a> child element), on top.</p>
<p>Many effects produce a number of intermediate layers in order to create
the final output image. This filter allows us to collapse those into a single
image. Although this could be done by using n-1 Composite-filters, it is more
convenient to have this common operation available in this form, and offers
the implementation some additional flexibility.</p>
<p>Each 'feMerge' element can have any number of 'feMergeNode' subelements,
each of which has an <a href="#CommonAttributes"><span class="attr-name">in</span></a> attribute.</p>
<p>The canonical implementation of feMerge is to render the entire effect
into one RGBA layer, and then render the resulting layer on the output
device. In certain cases (in particular if the output device itself is a
continuous tone device), and since merging is associative, it might be a
sufficient approximation to evaluate the effect one layer at a time and
render each layer individually onto the output device bottom to top.</p>
<p>If the topmost image input is <a href="#SourceGraphic"><span class="attr-value">SourceGraphic</span></a> and this <span class="element-name">'feMerge'</span> is the last filter primitive in the
filter, the implementation is encouraged to render the layers up to that
point, and then render the <a href="#SourceGraphic"><span class="attr-value">SourceGraphic</span></a> directly from its vector
description on top.</p>
<a id="feMergeNode" name="feMergeNode"></a> <a class="indexref-feMergeNode#Q#_element" id="feMergeNodeElement" name="feMergeNodeElement"></a>
<div class="adef-list">
</div>
<p><a href="#AnExample">The example</a> at the start of this chapter makes
use of the <span class="element-name">feMerge</span> filter primitive to
composite two intermediate filter results together.</p>
<h2 id="feMorphologyElement">19 Filter primitive <span class="element-name">'feMorphology'</span></h2>
<p>This filter primitive performs "fattening" or "thinning" of artwork. It is
particularly useful for fattening or thinning an alpha channel.</p>
<p>The dilation (or erosion) kernel is a rectangle with a width of
2*<em>x-radius</em> and a height of 2*<em>y-radius</em>. In dilation, the
output pixel is the individual component-wise maximum of the corresponding
R,G,B,A values in the input image's kernel rectangle. In erosion, the output
pixel is the individual component-wise minimum of the corresponding R,G,B,A
values in the input image's kernel rectangle.</p>
<p>Frequently this operation will take place on alpha-only images, such as
that produced by the built-in input, <a href="#SourceAlpha"><span class="attr-value">SourceAlpha</span></a>. In that case, the implementation
might want to optimize the single channel case.</p>
<p>If the input has infinite extent and is constant, this operation has no
effect. If the input has infinite extent and is a tile, the filter is
evaluated with periodic boundary conditions.</p>
<p>Because <span class="element-name">'feMorphology'</span> operates on
premultipied color values, it will always result in color values less than or
equal to the alpha channel.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feMorphologyOperatorAttribute" name="feMorphologyOperatorAttribute"></a> <span class="adef">operator</span> = "<em>erode | dilate</em>"</dt>
<dd>A keyword indicating whether to erode (i.e., thin) or dilate (fatten)
the source graphic.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feMorphologyRadiusAttribute" name="feMorphologyRadiusAttribute"></a> <span class="adef">radius</span> =
"<em><number-optional-number></em>"</dt>
<dd>The radius (or radii) for the operation. If two <number>
s are provided, the first number represents a x-radius and the second
value represents a y-radius. If one number is provided, then that value
is used for both X and Y. The values are in the coordinate system
established by attribute <a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
A negative or zero value disables the effect of the given filter
primitive (i.e., the result is a transparent black image).<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/feMorphology.svg">feMorphology.svg</a>
</div>
<div class="examplesource">
<pre>
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="5cm" height="7cm" viewBox="0 0 700 500"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<title>Example feMorphology - Examples of erode and dilate</title>
<desc>Five text strings drawn as outlines.
The first is unfiltered. The second and third use 'erode'.
The fourth and fifth use 'dilate'.</desc>
<defs>
<filter id="Erode3">
<feMorphology operator="erode" in="SourceGraphic" radius="3" />
</filter>
<filter id="Erode6">
<feMorphology operator="erode" in="SourceGraphic" radius="6" />
</filter>
<filter id="Dilate3">
<feMorphology operator="dilate" in="SourceGraphic" radius="3" />
</filter>
<filter id="Dilate6">
<feMorphology operator="dilate" in="SourceGraphic" radius="6" />
</filter>
</defs>
<rect fill="none" stroke="blue" stroke-width="2"
x="1" y="1" width="698" height="498"/>
<g enable-background="new" >
<g font-family="Verdana" font-size="75"
fill="none" stroke="black" stroke-width="6" >
<text x="50" y="90">Unfiltered</text>
<text x="50" y="180" filter="url(#Erode3)" >Erode radius 3</text>
<text x="50" y="270" filter="url(#Erode6)" >Erode radius 6</text>
<text x="50" y="360" filter="url(#Dilate3)" >Dilate radius 3</text>
<text x="50" y="450" filter="url(#Dilate6)" >Dilate radius 6</text>
</g>
</g>
</svg>
</pre>
</div>
<div class="exampleimage">
<img src="examples/feMorphology.png" alt="Rendering of feMorphology.svg" />
</div>
</div>
<h2 id="feOffsetElement">20 Filter primitive <span class="element-name">'feOffset'</span></h2>
<p>This filter primitive offsets the input image relative to its current
position in the image space by the specified vector.</p>
<p>This is important for effects like drop shadows.</p>
<p>When applying this filter, the destination location may be offset by a
fraction of a pixel in device space. In this case a high quality viewer
should make use of appropriate interpolation techniques, for example bilinear
or bicubic. This is especially recommended for dynamic viewers where this
interpolation provides visually smoother movement of images. For static
viewers this is less of a concern. Close attention should be made to the
<span class="prop-name">'image-rendering'</span> property setting to
determine the authors intent.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feOffsetDxAttribute" name="feOffsetDxAttribute"></a> <span class="adef">dx</span> = "<em><number></em>"</dt>
<dd>The amount to offset the input graphic along the x-axis. The offset
amount is expressed in the coordinate system established by attribute
<a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feOffsetDyAttribute" name="feOffsetDyAttribute"></a> <span class="adef">dy</span> = "<em><number></em>"</dt>
<dd>The amount to offset the input graphic along the y-axis. The offset
amount is expressed in the coordinate system established by attribute
<a href="#FilterElementPrimitiveUnitsAttribute"><span class="attr-name">primitiveUnits</span></a> on the <a href="#FilterElement"><span class="element-name">'filter'</span></a>
element.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<p><a href="#AnExample">The example</a> at the start of this chapter makes
use of the <span class="element-name">feOffset</span> filter primitive to
offset the drop shadow from the original source graphic.</p>
<h2 id="feSpecularLightingElement">21 Filter primitive <span class="element-name">'feSpecularLighting'</span></h2>
<p>This filter primitive lights a source graphic using the alpha channel as a
bump map. The resulting image is an RGBA image based on the light color. The
lighting calculation follows the standard specular component of the Phong
lighting model. The resulting image depends on the light color, light
position and surface geometry of the input bump map. The result of the
lighting calculation is added. The filter primitive assumes that the viewer
is at infinity in the z direction (i.e., the unit vector in the eye direction
is (0,0,1) everywhere).</p>
<p>This filter primitive produces an image which contains the specular
reflection part of the lighting calculation. Such a map is intended to be
combined with a texture using the <em>add</em> term of the
<em>arithmetic</em> <a href="#feCompositeElement"><span class="element-name">'feComposite'</span></a> method. Multiple light sources
can be simulated by adding several of these light maps before applying it to
the texture image.</p>
<p>The resulting RGBA image is computed as follows:</p>
<p class="filterformula">S<sub>r</sub> = k<sub>s</sub> * pow(N.H,
specularExponent) * L<sub>r<br></br>
</sub> S<sub>g</sub> = k<sub>s</sub> * pow(N.H, specularExponent) *
L<sub>g<br></br>
</sub> S<sub>b</sub> = k<sub>s</sub> * pow(N.H, specularExponent) *
L<sub>b<br></br>
</sub> S<sub>a</sub> = max(S<sub>r,</sub> S<sub>g,</sub> S<sub>b</sub>)</p>
<p>where</p>
<dl>
<dd>k<sub>s</sub> = specular lighting constant<br></br>
N = surface normal unit vector, a function of x and y<br></br>
H = "halfway" unit vector between eye unit vector and light unit
vector<br></br>
<br></br>
L<sub>r</sub>,L<sub>g</sub>,L<sub>b</sub> = RGB components of light</dd>
</dl>
<p>See <a href="#feDiffuseLightingElement"><span class="element-name">'feDiffuseLighting'</span></a> for definition of N and
(L<sub>r</sub>, L<sub>g</sub>, L<sub>b</sub>).</p>
<p>The definition of H reflects our assumption of the constant eye vector E =
(0,0,1):</p>
<p class="filterformula">H = (L + E) / Norm(L+E)</p>
<p>where L is the light unit vector.</p>
<p>Unlike the <a href="#feDiffuseLightingElement"><span class="element-name">'feDiffuseLighting'</span></a>, the <span class="element-name">'feSpecularLighting'</span> filter produces a non-opaque
image. This is due to the fact that the specular result
(S<sub>r</sub>,S<sub>g</sub>,S<sub>b</sub>,S<sub>a</sub>) is meant to be
added to the textured image. The alpha channel of the result is the max of
the color components, so that where the specular light is zero, no additional
coverage is added to the image and a fully white highlight will add
opacity.</p>
<p>The <a href="#feDiffuseLightingElement"><span class="element-name">'feDiffuseLighting'</span></a> and <span class="element-name">'feSpecularLighting'</span> filters will often be
applied together. An implementation may detect this and calculate both maps
in one pass, instead of two.</p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feSpecularLightingSurfaceScaleAttribute" name="feSpecularLightingSurfaceScaleAttribute"></a> <span class="adef">surfaceScale</span> = "<em><number></em>"</dt>
<dd>height of surface when A<sub>in</sub> = 1.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpecularLightingSpecularConstantAttribute" name="feSpecularLightingSpecularConstantAttribute"></a> <span class="adef">specularConstant</span> = "<em><number></em>"</dt>
<dd>ks in Phong lighting model. In SVG, this can be any non-negative
number.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feSpecularLightingSpecularExponentAttribute" name="feSpecularLightingSpecularExponentAttribute"></a> <span class="adef">specularExponent</span> = "<em><number></em>"</dt>
<dd>Exponent for specular term, larger is more "shiny". Range 1.0 to
128.0.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<p>The light source is defined by one of the child elements <a href="#feDistantLightElement"><span class="element-name">'feDistantLight'</span></a>, <a href="#fePointLightElement"><span class="element-name">'fePointLight'</span></a> or <a href="#feDistantLightElement"><span class="element-name">'feDistantLight'</span></a>. The light color is
specified by property <a href="#LightingColorProperty"><span class="prop-name">'lighting-color'</span></a>.</p>
<p><a href="#AnExample">The example</a> at the start of this chapter makes
use of the <span class="element-name">feSpecularLighting</span> filter
primitive to achieve a highly reflective, 3D glowing effect.</p>
<h2 id="feTileElement">22 Filter primitive <span class="element-name">'feTile'</span></h2>
<p>This filter primitive fills a target rectangle with a repeated, tiled
pattern of an input image. </p>
<div class="changed">
The target rectangle is as large as the <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a> established
by the <span class="element-name">'feTile'</span> element. </div>
<p>Typically, the input image has been defined with its own <a href="#FilterPrimitiveSubRegion">filter primitive subregion</a> in order to
define a reference tile. <span class="element-name">'feTile'</span>
replicates the reference tile in both X and Y to completely fill the target
rectangle. The top/left corner of each given tile is at location
<code>(x+i*width,y+j*height)</code>, where <code>(x,y)</code> represents the
top/left of the input image's filter primitive subregion, <code>width</code>
and <code>height</code> represent the width and height of the input image's
filter primitive subregion, and <code>i</code> and <code>j</code> can be any
integer value. In most cases, the input image will have a smaller filter
primitive subregion than the <span class="element-name">'feTile'</span> in
order to achieve a repeated pattern effect.</p>
<p>Implementers must take appropriate measures in constructing the tiled
image to avoid artifacts between tiles, particularly in situations where the
user to device transform includes shear and/or rotation. Unless care is
taken, interpolation can lead to edge pixels in the tile having opacity
values lower or higher than expected due to the interaction of painting
adjacent tiles which each have partial overlap with particular pixels.</p>
<div class="adef-list">
</div>
<h2 id="feTurbulenceElement">23 Filter primitive <span class="element-name">'feTurbulence'</span></h2>
<p>This filter primitive creates an image using the Perlin turbulence
function. It allows the synthesis of artificial textures like clouds or
marble. For a detailed description the of the Perlin turbulence function, see
"Texturing and Modeling", Ebert et al, AP Professional, 1994. The resulting
image will fill the entire <a href="#FilterPrimitiveSubRegion">filter
primitive subregion</a> for this filter primitive.</p>
<p>It is possible to create bandwidth-limited noise by synthesizing only one
octave.</p>
<p>The C code below shows the exact algorithm used for this filter effect.</p>
<p>For fractalSum, you get a turbFunctionResult that is aimed at a range of
-1 to 1 (the actual result might exceed this range in some cases). To convert
to a color value, use the formula <code>colorValue = ((turbFunctionResult *
255) + 255) / 2</code>, then clamp to the range 0 to 255.</p>
<p>For turbulence, you get a turbFunctionResult that is aimed at a range of 0
to 1 (the actual result might exceed this range in some cases). To convert to
a color value, use the formula <code>colorValue = (turbFunctionResult *
255)</code>, then clamp to the range 0 to 255.</p>
<p>The following order is used for applying the pseudo random numbers. An
initial seed value is computed based on attribute <span class="attr-name">seed</span>. Then the implementation computes the lattice
points for R, then continues getting additional pseudo random numbers
relative to the last generated pseudo random number and computes the lattice
points for G, and so on for B and A.</p>
<p>The generated color and alpha values are in the color space determined by
the value of property <span class="prop-name">'color-interpolation-filters'</span>:</p>
<pre class="svgsamplecompressed">/* Produces results in the range [1, 2**31 - 2].
Algorithm is: r = (a * r) mod m
where a = 16807 and m = 2**31 - 1 = 2147483647
See [Park & Miller], CACM vol. 31 no. 10 p. 1195, Oct. 1988
To test: the algorithm should produce the result 1043618065
as the 10,000th generated number if the original seed is 1.
*/
#define RAND_m 2147483647 /* 2**31 - 1 */
#define RAND_a 16807 /* 7**5; primitive root of m */
#define RAND_q 127773 /* m / a */
#define RAND_r 2836 /* m % a */
long setup_seed(long lSeed)
{
if (lSeed <= 0) lSeed = -(lSeed % (RAND_m - 1)) + 1;
if (lSeed > RAND_m - 1) lSeed = RAND_m - 1;
return lSeed;
}
long random(long lSeed)
{
long result;
result = RAND_a * (lSeed % RAND_q) - RAND_r * (lSeed / RAND_q);
if (result <= 0) result += RAND_m;
return result;
}
#define BSize 0x100
#define BM 0xff
#define PerlinN 0x1000
#define NP 12 /* 2^PerlinN */
#define NM 0xfff
static uLatticeSelector[BSize + BSize + 2];
static double fGradient[4][BSize + BSize + 2][2];
struct StitchInfo
{
int nWidth; // How much to subtract to wrap for stitching.
int nHeight;
int nWrapX; // Minimum value to wrap.
int nWrapY;
};
static void init(long lSeed)
{
double s;
int i, j, k;
lSeed = setup_seed(lSeed);
for(k = 0; k < 4; k++)
{
for(i = 0; i < BSize; i++)
{
uLatticeSelector[i] = i;
for (j = 0; j < 2; j++)
fGradient[k][i][j] = (double)(((lSeed = random(lSeed)) % (BSize + BSize)) - BSize) / BSize;
s = double(sqrt(fGradient[k][i][0] * fGradient[k][i][0] + fGradient[k][i][1] * fGradient[k][i][1]));
fGradient[k][i][0] /= s;
fGradient[k][i][1] /= s;
}
}
while(--i)
{
k = uLatticeSelector[i];
uLatticeSelector[i] = uLatticeSelector[j = (lSeed = random(lSeed)) % BSize];
uLatticeSelector[j] = k;
}
for(i = 0; i < BSize + 2; i++)
{
uLatticeSelector[BSize + i] = uLatticeSelector[i];
for(k = 0; k < 4; k++)
for(j = 0; j < 2; j++)
fGradient[k][BSize + i][j] = fGradient[k][i][j];
}
}
#define s_curve(t) ( t * t * (3. - 2. * t) )
#define lerp(t, a, b) ( a + t * (b - a) )
double noise2(int nColorChannel, double vec[2], StitchInfo *pStitchInfo)
{
int bx0, bx1, by0, by1, b00, b10, b01, b11;
double rx0, rx1, ry0, ry1, *q, sx, sy, a, b, t, u, v;
register i, j;
t = vec[0] + PerlinN;
bx0 = (int)t;
bx1 = bx0+1;
rx0 = t - (int)t;
rx1 = rx0 - 1.0f;
t = vec[1] + PerlinN;
by0 = (int)t;
by1 = by0+1;
ry0 = t - (int)t;
ry1 = ry0 - 1.0f;
// If stitching, adjust lattice points accordingly.
if(pStitchInfo != NULL)
{
if(bx0 >= pStitchInfo->nWrapX)
bx0 -= pStitchInfo->nWidth;
if(bx1 >= pStitchInfo->nWrapX)
bx1 -= pStitchInfo->nWidth;
if(by0 >= pStitchInfo->nWrapY)
by0 -= pStitchInfo->nHeight;
if(by1 >= pStitchInfo->nWrapY)
by1 -= pStitchInfo->nHeight;
}
bx0 &= BM;
bx1 &= BM;
by0 &= BM;
by1 &= BM;
i = uLatticeSelector[bx0];
j = uLatticeSelector[bx1];
b00 = uLatticeSelector[i + by0];
b10 = uLatticeSelector[j + by0];
b01 = uLatticeSelector[i + by1];
b11 = uLatticeSelector[j + by1];
sx = double(s_curve(rx0));
sy = double(s_curve(ry0));
q = fGradient[nColorChannel][b00]; u = rx0 * q[0] + ry0 * q[1];
q = fGradient[nColorChannel][b10]; v = rx1 * q[0] + ry0 * q[1];
a = lerp(sx, u, v);
q = fGradient[nColorChannel][b01]; u = rx0 * q[0] + ry1 * q[1];
q = fGradient[nColorChannel][b11]; v = rx1 * q[0] + ry1 * q[1];
b = lerp(sx, u, v);
return lerp(sy, a, b);
}
double turbulence(int nColorChannel, double *point, double fBaseFreqX, double fBaseFreqY,
int nNumOctaves, bool bFractalSum, bool bDoStitching,
double fTileX, double fTileY, double fTileWidth, double fTileHeight)
{
StitchInfo stitch;
StitchInfo *pStitchInfo = NULL; // Not stitching when NULL.
// Adjust the base frequencies if necessary for stitching.
if(bDoStitching)
{
// When stitching tiled turbulence, the frequencies must be adjusted
// so that the tile borders will be continuous.
if(fBaseFreqX != 0.0)
{
double fLoFreq = double(floor(fTileWidth * fBaseFreqX)) / fTileWidth;
double fHiFreq = double(ceil(fTileWidth * fBaseFreqX)) / fTileWidth;
if(fBaseFreqX / fLoFreq < fHiFreq / fBaseFreqX)
fBaseFreqX = fLoFreq;
else
fBaseFreqX = fHiFreq;
}
if(fBaseFreqY != 0.0)
{
double fLoFreq = double(floor(fTileHeight * fBaseFreqY)) / fTileHeight;
double fHiFreq = double(ceil(fTileHeight * fBaseFreqY)) / fTileHeight;
if(fBaseFreqY / fLoFreq < fHiFreq / fBaseFreqY)
fBaseFreqY = fLoFreq;
else
fBaseFreqY = fHiFreq;
}
// Set up initial stitch values.
pStitchInfo = &stitch;
stitch.nWidth = int(fTileWidth * fBaseFreqX + 0.5f);
stitch.nWrapX = fTileX * fBaseFreqX + PerlinN + stitch.nWidth;
stitch.nHeight = int(fTileHeight * fBaseFreqY + 0.5f);
stitch.nWrapY = fTileY * fBaseFreqY + PerlinN + stitch.nHeight;
}
double fSum = 0.0f;
double vec[2];
vec[0] = point[0] * fBaseFreqX;
vec[1] = point[1] * fBaseFreqY;
double ratio = 1;
for(int nOctave = 0; nOctave < nNumOctaves; nOctave++)
{
if(bFractalSum)
fSum += double(noise2(nColorChannel, vec, pStitchInfo) / ratio);
else
fSum += double(fabs(noise2(nColorChannel, vec, pStitchInfo)) / ratio);
vec[0] *= 2;
vec[1] *= 2;
ratio *= 2;
if(pStitchInfo != NULL)
{
// Update stitch values. Subtracting PerlinN before the multiplication and
// adding it afterward simplifies to subtracting it once.
stitch.nWidth *= 2;
stitch.nWrapX = 2 * stitch.nWrapX - PerlinN;
stitch.nHeight *= 2;
stitch.nWrapY = 2 * stitch.nWrapY - PerlinN;
}
}
return fSum;
}</pre>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feTurbulenceBaseFrequencyAttribute" name="feTurbulenceBaseFrequencyAttribute"></a> <span class="adef">baseFrequency</span> =
"<em><number-optional-number></em>"</dt>
<dd>The base frequency (frequencies) parameter(s) for the noise function.
If two <number>
s are provided, the first number represents a base frequency in the X
direction and the second value represents a base frequency in the Y
direction. If one number is provided, then that value is used for both
X and Y.<br></br>
If the attribute is not specified, or if a negative value for base
frequency is specified, then the effect is as if a value of <span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feTurbulenceNumOctavesAttribute" name="feTurbulenceNumOctavesAttribute"></a> <span class="adef">numOctaves</span> = "<em><integer></em>"</dt>
<dd>The numOctaves parameter for the noise function.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">1</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feTurbulenceSeedAttribute" name="feTurbulenceSeedAttribute"></a>
<span class="adef">seed</span> = "<em><number></em>"</dt>
<dd>The starting number for the pseudo random number generator.<br></br>
If the attribute is not specified, then the effect is as if a value of
<span class="attr-value">0</span> were specified.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feTurbulenceStitchTilesAttribute" name="feTurbulenceStitchTilesAttribute"></a> <span class="adef">stitchTiles</span> = "<em>stitch | noStitch</em>"</dt>
<dd>If <span class="attr-value">stitchTiles="noStitch"</span>, no attempt
it made to achieve smooth transitions at the border of tiles which
contain a turbulence function. Sometimes the result will show clear
discontinuities at the tile borders.<br></br>
If <span class="attr-value">stitchTiles="stitch"</span>, then the user
agent will automatically adjust baseFrequency-x and baseFrequency-y
values such that the feTurbulence node's width and height (i.e., the
width and height of the current subregion) contains an integral number
of the Perlin tile width and height for the first octave. The
baseFrequency will be adjusted up or down depending on which way has
the smallest relative (not absolute) change as follows: Given the
frequency, calculate <code>lowFreq=floor(width*frequency)/width</code>
and <code>hiFreq=ceil(width*frequency)/width</code>. If
frequency/lowFreq < hiFreq/frequency then use lowFreq, else use
hiFreq. While generating turbulence values, generate lattice vectors as
normal for Perlin Noise, except for those lattice points that lie on
the right or bottom edges of the active area (the size of the resulting
tile). In those cases, copy the lattice vector from the opposite edge
of the active area.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feTurbulenceTypeAttribute" name="feTurbulenceTypeAttribute"></a>
<span class="adef">type</span> = "<em>fractalNoise | turbulence</em>"</dt>
<dd>Indicates whether the filter primitive should perform a noise or
turbulence function.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
<div class="example">
<div class="exampleheader">
<strong>Example:</strong> <a href="examples/feTurbulence.svg">feTurbulence.svg</a>
</div>
<div class="examplesource">
<pre>
<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="450px" height="325px" viewBox="0 0 450 325"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<title>Example feTurbulence - Examples of feTurbulence operations</title>
<desc>Six rectangular areas showing the effects of
various parameter settings for feTurbulence.</desc>
<g font-family="Verdana" text-anchor="middle" font-size="10" >
<defs>
<filter id="Turb1" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feTurbulence type="turbulence" baseFrequency="0.05" numOctaves="2"/>
</filter>
<filter id="Turb2" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feTurbulence type="turbulence" baseFrequency="0.1" numOctaves="2"/>
</filter>
<filter id="Turb3" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feTurbulence type="turbulence" baseFrequency="0.05" numOctaves="8"/>
</filter>
<filter id="Turb4" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feTurbulence type="fractalNoise" baseFrequency="0.1" numOctaves="4"/>
</filter>
<filter id="Turb5" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feTurbulence type="fractalNoise" baseFrequency="0.4" numOctaves="4"/>
</filter>
<filter id="Turb6" filterUnits="objectBoundingBox"
x="0%" y="0%" width="100%" height="100%">
<feTurbulence type="fractalNoise" baseFrequency="0.1" numOctaves="1"/>
</filter>
</defs>
<rect x="1" y="1" width="448" height="323"
fill="none" stroke="blue" stroke-width="1" />
<rect x="25" y="25" width="100" height="75" filter="url(#Turb1)" />
<text x="75" y="117">type=turbulence</text>
<text x="75" y="129">baseFrequency=0.05</text>
<text x="75" y="141">numOctaves=2</text>
<rect x="175" y="25" width="100" height="75" filter="url(#Turb2)" />
<text x="225" y="117">type=turbulence</text>
<text x="225" y="129">baseFrequency=0.1</text>
<text x="225" y="141">numOctaves=2</text>
<rect x="325" y="25" width="100" height="75" filter="url(#Turb3)" />
<text x="375" y="117">type=turbulence</text>
<text x="375" y="129">baseFrequency=0.05</text>
<text x="375" y="141">numOctaves=8</text>
<rect x="25" y="180" width="100" height="75" filter="url(#Turb4)" />
<text x="75" y="272">type=fractalNoise</text>
<text x="75" y="284">baseFrequency=0.1</text>
<text x="75" y="296">numOctaves=4</text>
<rect x="175" y="180" width="100" height="75" filter="url(#Turb5)" />
<text x="225" y="272">type=fractalNoise</text>
<text x="225" y="284">baseFrequency=0.4</text>
<text x="225" y="296">numOctaves=4</text>
<rect x="325" y="180" width="100" height="75" filter="url(#Turb6)" />
<text x="375" y="272">type=fractalNoise</text>
<text x="375" y="284">baseFrequency=0.1</text>
<text x="375" y="296">numOctaves=1</text>
</g>
</svg>
</pre>
</div>
<div class="exampleimage">
<img src="examples/feTurbulence.png" alt="Rendering of feTurbulence.svg" />
</div>
</div>
<div class="new">
<h2 id="feDropShadowElement">24 Filter primitive <span class="element-name">'feDropShadow'</span></h2>
<p>This filter creates a drop shadow of the input image. It is a shorthand
filter, and is defined in terms of combinations of other filter primitives.
The expectation is that it can be optimized more easily by
implementations.</p>
<p>The result of a <span class="element-name">'feDropShadow'</span> filter
primitive is equivalent to the following: </p>
<pre class="examplesource">
<feGaussianBlur in="<b>alpha-channel-of-feDropShadow-in</b>" stdDeviation="<b>stdDeviation-of-feDropShadow</b>"/>
<feOffset dx="<b>dx-of-feDropShadow</b>" dy="<b>dy-of-feDropShadow</b>" result="offsetblur"/>
<feFlood flood-color="<b>flood-color-of-feDropShadow</b>" flood-opacity="<b>flood-opacity-of-feDropShadow</b>"/>
<feComposite in2="offsetblur" operator="in"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="<b>in-of-feDropShadow</b>"/>
</feMerge>
</pre>
<p>
The above divided into steps:</p>
<ol>
<li>Take the alpha channel of the input to the <span class="element-name">'feDropShadow'</span> filter primitive and the <a href="#feDropShadowStdDeviationAttribute"><span class="attr-name">stdDeviation</span></a> on the <span class="element-name">'feDropShadow'</span> and do processing as if the
following <a href="#feGaussianBlurElement"><span class="element-name">'feGaussianBlur'</span></a> was applied:
<pre class="examplesource"> <feGaussianBlur in="<b>alpha-channel-of-feDropShadow-in</b>" stdDeviation="<b>stdDeviation-of-feDropShadow</b>"/></pre>
<br></br>
</li>
<li>Offset the result of step 1 by <a href="#feDropShadowDxAttribute"><span class="attr-name">dx</span></a> and <a href="#feDropShadowDyAttribute"><span class="attr-name">dy</span></a> as
specified on the <span class="element-name">'feDropShadow'</span>
element, equivalent to applying an <a href="#feOffsetElement"><span class="element-name">'feOffset'</span></a> with these parameters:
<pre class="examplesource"> <feOffset dx="<b>dx-of-feDropShadow</b>" dy="<b>dy-of-feDropShadow</b>" result="offsetblur"/></pre>
<br></br>
</li>
<li>Do processing as if an <a href="#feFloodElement"><span class="element-name">'feFlood'</span></a> element with <a href="#propdef-flood-color"><span class="prop-name">'flood-color'</span></a> and <a href="#propdef-flood-opacity"><span class="prop-name">'flood-opacity'</span></a> as specified on the <span class="element-name">'feDropShadow'</span> was applied:
<pre class="examplesource"> <feFlood flood-color="<b>flood-color-of-feDropShadow</b>" flood-opacity="<b>flood-opacity-of-feDropShadow</b>"/></pre>
<br></br>
</li>
<li>Composite the result of the <a href="#feFloodElement"><span class="element-name">'feFlood'</span></a> in step 3 with the result of
the <a href="#feOffsetElement"><span class="element-name">'feOffset'</span></a> in step 2 as if an <a href="#feCompositeElement"><span class="element-name">'feComposite'</span></a> filter primitive with <a href="#feCompositeOperatorAttribute"><span class="attr-name">operator</span></a>='in' was applied:
<pre class="examplesource"> <feComposite in2="offsetblur" operator="in"/></pre>
<br></br>
</li>
<li>Finally merge the result of the previous step, doing processing as if
the following <a href="#feMergeElement"><span class="element-name">'feMerge'</span></a> was performed:
<pre class="examplesource"> <feMerge>
<feMergeNode/>
<feMergeNode in="<b>in-of-feDropShadow</b>"/>
</feMerge></pre>
</li>
</ol>
<p>Note that while the definition of the <span class="element-name">'feDropShadow'</span> filter primitive says that it can
be expanded into an equivalent tree it is not required that it is implemented
like that. The expectation is that user agents can optimize the handling by not having to do all the steps separately. Beyond the DOM interface <a href="#InterfaceSVGFEDropShadowElement">SVGFEDropShadow</a> there is no way
of accessing the internals of the <span class="element-name">'feDropShadow'</span> filter primitive, meaning if the
filter primitive is implemented as an equivalent tree then that tree must not
be exposed to the DOM. </p>
<div class="adef-list">
<p><em>Attribute definitions:</em></p>
<dl>
<dt><a id="feDropShadowDxAttribute" name="feDropShadowDxAttribute"></a>
<span class="adef">dx</span> = "<em><number></em>"</dt>
<dd>The x offset of the drop shadow. If the attribute is not specified,
then the effect is as if a value of <span class="attr-value">2</span>
were specified. This attribute is then forwarded to the <span class="attr-name">dx</span> attribute of the internal <a href="#feOffsetElement"><span class="element-name">'feOffset'</span></a> element.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDropShadowDyAttribute" name="feDropShadowDyAttribute"></a>
<span class="adef">dy</span> = "<em><number></em>"</dt>
<dd>The y offset of the drop shadow. If the attribute is not specified,
then the effect is as if a value of <span class="attr-value">2</span>
were specified. This attribute is then forwarded to the <span class="attr-name">dy</span> attribute of the internal <a href="#feOffsetElement"><span class="element-name">'feOffset'</span></a> element.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
<dt><a id="feDropShadowStdDeviationAttribute" name="feDropShadowStdDeviationAttribute"></a> <span class="adef">stdDeviation</span> =
"<em><number-optional-number></em>"</dt>
<dd>The standard deviation for the blur operation in the drop shadow. If
the attribute is not specified, then the effect is as if a value of
<span class="attr-value">2</span> were specified. This attribute is
then forwarded to the <a href="#feDropShadowStdDeviationAttribute"><span class="attr-name">stdDeviation</span></a> attribute of the internal <a href="#feGaussianBlurElement"><span class="element-name">'feGaussianBlur'</span></a> element.<br></br>
<span class="anim-target">Animatable:yes.</span></dd>
</dl>
</div>
</div>
<div class="note">
<h2 id="feDiffuseSpecularElement">25 Filter primitive <span class="element-name">'feDiffuseSpecular'</span></h2>
The SVG WG is looking at providing a shorthand for diffuse+specular.
</div>
<div class="note">
<h2 id="feCustomElement">26 Filter primitive <span class="element-name">'feCustom'</span></h2>
The SVG WG is looking to add a filter primitive that allows programmatic access
to the pixel data for a filter.
</div>
<div class="new">
<h2 id="RelaxNG">27 RelaxNG Schema for SVG Filters 1.2</h2>
<p>The schema for SVG Filters 1.2 is written in <a href="http://www.y12.doe.gov/sgml/sc34/document/0362_files/relaxng-is.pdf">RelaxNG</a>
[<a href="#ref-RNG">RelaxNG</a>], a namespace-aware schema language that uses
the datatypes from <a href="http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/">XML Schema Part
2</a> [<a href="#ref-Schema2">Schema2</a>]. This allows namespaces and
modularity to be much more naturally expressed than using DTD syntax. The
RelaxNG schema for SVG Filter 1.2 may be imported by other RelaxNG schemas,
or combined with other schemas in other languages into a multi-namespace,
multi-grammar schema using <a href="http://www.asahi-net.or.jp/~eb2m-mrt/dsdl/">Namespace-based Validation
Dispatching Language</a> [<a href="#ref-NVDL">NVDL</a>].</p>
<p>Unlike a DTD, the schema used for validation is not hardcoded into the
document instance. There is no equivalent to the DOCTYPE declaration. Simply
point your editor or other validation tool to the IRI of the schema (or your
local cached copy, as you prefer).</p>
<p>
The RNG is under construction, and only the individual RNG snippets are available at this time. They have not yet been integrated into a functional schema. The individual RNG files are available <a href="rng">here</a>.
</p>
</div>
<h2 id="DOMInterfaces">28 DOM interfaces</h2>
<div class="note">
The interfaces below will be made available in a IDL file for an upcoming draft.
</div>
<p>The following interfaces are defined below: <a href="#InterfaceImageData">ImageData</a>, <a href="#InterfaceSVGFilterElement">SVGFilterElement</a>, <a href="#InterfaceSVGFilterPrimitiveStandardAttributes">SVGFilterPrimitiveStandardAttributes</a>,
<a href="#InterfaceSVGFEBlendElement">SVGFEBlendElement</a>, <a href="#InterfaceSVGFEColorMatrixElement">SVGFEColorMatrixElement</a>, <a href="#InterfaceSVGFEComponentTransferElement">SVGFEComponentTransferElement</a>,
<a href="#InterfaceSVGComponentTransferFunctionElement">SVGComponentTransferFunctionElement</a>,
<a href="#InterfaceSVGFEFuncRElement">SVGFEFuncRElement</a>, <a href="#InterfaceSVGFEFuncGElement">SVGFEFuncGElement</a>, <a href="#InterfaceSVGFEFuncBElement">SVGFEFuncBElement</a>, <a href="#InterfaceSVGFEFuncAElement">SVGFEFuncAElement</a>, <a href="#InterfaceSVGFECompositeElement">SVGFECompositeElement</a>, <a href="#InterfaceSVGFEConvolveMatrixElement">SVGFEConvolveMatrixElement</a>,
<a href="#InterfaceSVGFEDiffuseLightingElement">SVGFEDiffuseLightingElement</a>,
<a href="#InterfaceSVGFEDistantLightElement">SVGFEDistantLightElement</a>, <a href="#InterfaceSVGFEPointLightElement">SVGFEPointLightElement</a>, <a href="#InterfaceSVGFESpotLightElement">SVGFESpotLightElement</a>, <a href="#InterfaceSVGFEDisplacementMapElement">SVGFEDisplacementMapElement</a>,
<a href="#InterfaceSVGFEFloodElement">SVGFEFloodElement</a>, <a href="#InterfaceSVGFEGaussianBlurElement">SVGFEGaussianBlurElement</a>, <a href="#InterfaceSVGFEImageElement">SVGFEImageElement</a>, <a href="#InterfaceSVGFEMergeElement">SVGFEMergeElement</a>, <a href="#InterfaceSVGFEMergeNodeElement">SVGFEMergeNodeElement</a>, <a href="#InterfaceSVGFEMorphologyElement">SVGFEMorphologyElement</a>, <a href="#InterfaceSVGFEOffsetElement">SVGFEOffsetElement</a>, <a href="#InterfaceSVGFESpecularLightingElement">SVGFESpecularLightingElement</a>,
<a href="#InterfaceSVGFETileElement">SVGFETileElement</a>, <a href="#InterfaceSVGFETurbulenceElement">SVGFETurbulenceElement</a>, <a href="#InterfaceSVGFEDropShadowElement">SVGFEDropShadowElement</a>.</p>
<br></br>
<div class="new">
<h3 id="InterfaceImageData">28.1 Interface <span class="DOMInterfaceName">ImageData</span></h3>
<p>The <span class="DOMInterfaceName">ImageData</span> interface corresponds
to pixel data that can be used as input to the <span class="DOMInterfaceName">SVGFilterElement</span> interface.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface ImageData {
readonly attribute unsigned long width;
readonly attribute unsigned long height;
readonly attribute int[] data;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">unsigned long</span> <span class="dom-attr-name">width</span></dt>
<dd>The width of the bitmap that the ImageData represents.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">unsigned long</span> <span class="dom-attr-name">height</span></dt>
<dd>The height of the bitmap that the ImageData represents.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">int[]</span> <span class="dom-attr-name">data</span></dt>
<dd>An array of pixel values that is the bitmap. This array must
always be in the form of width×height×4 integer values. The
pixel data is in left-to-right order, starting from the top-left
corner, and going row by row downwards. Every pixel is
represented by four integer values, red, green, blue and alpha,
in that order. The range of each color component is 0..255. The
intent is that this is compatible with <a href="http://www.whatwg.org/">WHATWG</a> [<a href="#ref-WHATWG">WHATWG</a>] canvas interfaces, in particular
see <a href="http://www.whatwg.org/specs/web-apps/current-work/#imagedata">ImageData</a>.</dd>
</dl>
</dd>
</dl>
<br></br>
</div>
<h3 id="InterfaceSVGFilterElement">28.2 Interface <span class="DOMInterfaceName">SVGFilterElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFilterElement</span> interface
corresponds to the <span class="element-name">'filter'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFilterElement :
SVGElement,
SVGURIReference,
SVGLangSpace,
SVGExternalResourcesRequired,
SVGStylable,
SVGUnitTypes {
readonly attribute SVGAnimatedEnumeration filterUnits;
readonly attribute SVGAnimatedEnumeration primitiveUnits;
readonly attribute SVGAnimatedEnumeration filterMarginUnits;
readonly attribute SVGAnimatedEnumeration primitiveMarginUnits;
readonly attribute SVGAnimatedLength x;
readonly attribute SVGAnimatedLength y;
readonly attribute SVGAnimatedLength width;
readonly attribute SVGAnimatedLength height;
readonly attribute SVGAnimatedInteger filterResX;
readonly attribute SVGAnimatedInteger filterResY;
void setFilterRes ( in unsigned long filterResX, in unsigned long filterResY );
ImageData apply(in ImageData source);
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">filterUnits</span></dt>
<dd>Corresponds to attribute <span class="attr-name">filterUnits</span> on the given <span class="element-name">'filter'</span> element. Takes one of the
constants defined in <span class="DOMInterfaceName">SVGUnitTypes</span>.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">primitiveUnits</span></dt>
<dd>Corresponds to attribute <span class="attr-name">primitiveUnits</span> on the given <span class="element-name">'filter'</span> element. Takes one of the
constants defined in <span class="DOMInterfaceName">SVGUnitTypes</span>.</dd>
</dl>
<div class="new"><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">filterMarginUnits</span></dt>
<dd>Corresponds to attribute <span class="attr-name">filterMarginUnits</span> on the given <span class="element-name">'filter'</span> element. Takes one of the
constants defined in <span class="DOMInterfaceName">SVGUnitTypes</span>.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">primitiveMarginUnits</span></dt>
<dd>Corresponds to attribute <span class="attr-name">primitiveMarginUnits</span> on the given <span class="element-name">'filter'</span> element. Takes one of the
constants defined in <span class="DOMInterfaceName">SVGUnitTypes</span>.</dd>
</dl>
</div>
<dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">x</span></dt>
<dd>Corresponds to attribute <span class="attr-name">x</span> on
the given <span class="element-name">'filter'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">y</span></dt>
<dd>Corresponds to attribute <span class="attr-name">y</span> on
the given <span class="element-name">'filter'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">width</span></dt>
<dd>Corresponds to attribute <span class="attr-name">width</span>
on the given <span class="element-name">'filter'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">height</span></dt>
<dd>Corresponds to attribute <span class="attr-name">height</span>
on the given <span class="element-name">'filter'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedInteger</span> <span class="dom-attr-name">filterResX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">filterRes</span> on the given <span class="element-name">'filter'</span> element. Contains the X
component of attribute <span class="attr-name">filterRes</span>.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedInteger</span> <span class="dom-attr-name">filterResY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">filterRes</span> on the given <span class="element-name">'filter'</span> element. Contains the Y
component (possibly computed automatically) of attribute <span class="attr-name">filterRes</span>.</dd>
</dl>
</dd>
<dt><b>Methods</b></dt>
<dd><dl>
<dt><span class="dom-method-name">setFilterRes</span></dt>
<dd>Sets the values for attribute <span class="attr-name">filterRes</span>.
<dl>
<dt><span class="dom-parameters">Parameters</span></dt>
<dd>
<table border="0" summary="method parameters">
<tbody>
<tr>
<td valign="top">in <span class="dom-parameter-type">unsigned long</span>
<span class="dom-parameter-name">filterResX</span></td>
<td></td>
<td>The X component of attribute <span class="attr-name">filterRes</span>.</td>
</tr>
<tr>
<td valign="top">in <span class="dom-parameter-type">unsigned long</span>
<span class="dom-parameter-name">filterResY</span></td>
<td></td>
<td>The Y component of attribute <span class="attr-name">filterRes</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
<dl>
<dt><span class="dom-no-returnvalue">No Return Value</span></dt>
</dl>
<dl>
<dt><span class="dom-no-exceptions">No Exceptions</span></dt>
</dl>
</dd>
</dl>
<div class="new">
<dl>
<dt><span class="dom-method-name">apply</span></dt>
<dd>Applies the filter to the given ImageData object and returns
the result.
<dl>
<dt><span class="dom-parameters">Parameters</span></dt>
<dd>
<table border="0" summary="method parameters">
<tbody>
<tr>
<td valign="top">in <span class="dom-parameter-type">ImageData</span> <span class="dom-parameter-name">source</span></td>
<td></td>
<td>The image to apply the filter to.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
<dl>
<dt><span class="dom-returnvalue">Return value</span></dt>
<dd>
<table border="0" summary="method return value">
<tbody>
<tr>
<td valign="top"><span class="dom-returnvalue-type">ImageData</span></td>
<td></td>
<td>The result of the filter, see <a href="#InterfaceImageData">ImageData</a> for how to
construct this.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
<dl>
<dt><span class="dom-no-exceptions">No Exceptions</span></dt>
</dl>
</dd>
</dl>
</div>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFilterPrimitiveStandardAttributes">28.3 Interface <span class="DOMInterfaceName">SVGFilterPrimitiveStandardAttributes</span></h3>
<p>This interface defines the set of DOM attributes that are common across
the filter interfaces.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFilterPrimitiveStandardAttributes : SVGStylable {
readonly attribute SVGAnimatedLength x;
readonly attribute SVGAnimatedLength y;
readonly attribute SVGAnimatedLength width;
readonly attribute SVGAnimatedLength height;
readonly attribute SVGAnimatedString result;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">x</span></dt>
<dd>Corresponds to attribute <span class="attr-name">x</span> on
the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">y</span></dt>
<dd>Corresponds to attribute <span class="attr-name">y</span> on
the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">width</span></dt>
<dd>Corresponds to attribute <span class="attr-name">width</span>
on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedLength</span> <span class="dom-attr-name">height</span></dt>
<dd>Corresponds to attribute <span class="attr-name">height</span>
on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">result</span></dt>
<dd>Corresponds to attribute <span class="attr-name">result</span>
on the given element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEBlendElement">28.4 Interface <span class="DOMInterfaceName">SVGFEBlendElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEBlendElement</span> interface
corresponds to the <span class="element-name">'feBlend'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEBlendElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
// Blend Mode Types
const unsigned short SVG_FEBLEND_MODE_UNKNOWN = 0;
const unsigned short SVG_FEBLEND_MODE_NORMAL = 1;
const unsigned short SVG_FEBLEND_MODE_MULTIPLY = 2;
const unsigned short SVG_FEBLEND_MODE_SCREEN = 3;
const unsigned short SVG_FEBLEND_MODE_DARKEN = 4;
const unsigned short SVG_FEBLEND_MODE_LIGHTEN = 5;
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedString in2;
readonly attribute SVGAnimatedEnumeration mode;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Blend Mode Types</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_FEBLEND_MODE_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_FEBLEND_MODE_NORMAL</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">normal</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FEBLEND_MODE_MULTIPLY</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">multiply</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FEBLEND_MODE_SCREEN</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">screen</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FEBLEND_MODE_DARKEN</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">darken</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FEBLEND_MODE_LIGHTEN</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">lighten</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feBlend'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in2</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in2</span> on
the given <span class="element-name">'feBlend'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">mode</span></dt>
<dd>Corresponds to attribute <span class="attr-name">mode</span> on
the given <span class="element-name">'feBlend'</span> element.
Takes one of the Blend Mode Types.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEColorMatrixElement">28.5 Interface <span class="DOMInterfaceName">SVGFEColorMatrixElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEColorMatrixElement</span>
interface corresponds to the <span class="element-name">'feColorMatrix'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEColorMatrixElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
// Color Matrix Types
const unsigned short SVG_FECOLORMATRIX_TYPE_UNKNOWN = 0;
const unsigned short SVG_FECOLORMATRIX_TYPE_MATRIX = 1;
const unsigned short SVG_FECOLORMATRIX_TYPE_SATURATE = 2;
const unsigned short SVG_FECOLORMATRIX_TYPE_HUEROTATE = 3;
const unsigned short SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA = 4;
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedEnumeration type;
readonly attribute SVGAnimatedNumberList values;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Color Matrix Types</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_FECOLORMATRIX_TYPE_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_FECOLORMATRIX_TYPE_MATRIX</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">matrix</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOLORMATRIX_TYPE_SATURATE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">saturate</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOLORMATRIX_TYPE_HUEROTATE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">hueRotate</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">luminanceToAlpha</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feColorMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">type</span></dt>
<dd>Corresponds to attribute <span class="attr-name">type</span> on
the given <span class="element-name">'feColorMatrix'</span>
element. Takes one of the Color Matrix Types.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumberList</span> <span class="dom-attr-name">values</span></dt>
<dd>Corresponds to attribute <span class="attr-name">values</span>
on the given <span class="element-name">'feColorMatrix'</span>
element.
<p>Provides access to the contents of the <span class="attr-name">values</span> attribute.</p>
</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEComponentTransferElement">28.6 Interface <span class="DOMInterfaceName">SVGFEComponentTransferElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEComponentTransferElement</span>
interface corresponds to the <span class="element-name">'feComponentTransfer'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEComponentTransferElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feComponentTransfer'</span>
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGComponentTransferFunctionElement">28.7 Interface <span class="DOMInterfaceName">SVGComponentTransferFunctionElement</span></h3>
<p>This interface defines a base interface used by the component transfer
function interfaces.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGComponentTransferFunctionElement : SVGElement {
// Component Transfer Types
const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN = 0;
const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY = 1;
const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_TABLE = 2;
const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE = 3;
const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_LINEAR = 4;
const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_GAMMA = 5;
readonly attribute SVGAnimatedEnumeration type;
readonly attribute SVGAnimatedNumberList tableValues;
readonly attribute SVGAnimatedNumber slope;
readonly attribute SVGAnimatedNumber intercept;
readonly attribute SVGAnimatedNumber amplitude;
readonly attribute SVGAnimatedNumber exponent;
readonly attribute SVGAnimatedNumber offset;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Component Transfer Types</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">identity</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPONENTTRANSFER_TYPE_TABLE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">table</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">discrete</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPONENTTRANSFER_TYPE_LINEAR</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">linear</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPONENTTRANSFER_TYPE_GAMMA</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">gamma</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">type</span></dt>
<dd>Corresponds to attribute <span class="attr-name">type</span> on
the given element. Takes one of the Component Transfer Types.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumberList</span> <span class="dom-attr-name">tableValues</span></dt>
<dd>Corresponds to attribute <span class="attr-name">tableValues</span> on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">slope</span></dt>
<dd>Corresponds to attribute <span class="attr-name">slope</span>
on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">intercept</span></dt>
<dd>Corresponds to attribute <span class="attr-name">intercept</span> on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">amplitude</span></dt>
<dd>Corresponds to attribute <span class="attr-name">amplitude</span> on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">exponent</span></dt>
<dd>Corresponds to attribute <span class="attr-name">exponent</span> on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">offset</span></dt>
<dd>Corresponds to attribute <span class="attr-name">offset</span>
on the given element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEFuncRElement">28.8 Interface <span class="DOMInterfaceName">SVGFEFuncRElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEFuncRElement</span> interface
corresponds to the <span class="element-name">'feFuncR'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEFuncRElement : SVGComponentTransferFunctionElement {};</pre>
</div>
<br></br>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEFuncGElement">28.9 Interface <span class="DOMInterfaceName">SVGFEFuncGElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEFuncGElement</span> interface
corresponds to the <span class="element-name">'feFuncG'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEFuncGElement : SVGComponentTransferFunctionElement {};</pre>
</div>
<br></br>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEFuncBElement">28.10 Interface <span class="DOMInterfaceName">SVGFEFuncBElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEFuncBElement</span> interface
corresponds to the <span class="element-name">'feFuncB'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEFuncBElement : SVGComponentTransferFunctionElement {};</pre>
</div>
<br></br>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEFuncAElement">28.11 Interface <span class="DOMInterfaceName">SVGFEFuncAElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEFuncAElement</span> interface
corresponds to the <span class="element-name">'feFuncA'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEFuncAElement : SVGComponentTransferFunctionElement {};</pre>
</div>
<br></br>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFECompositeElement">28.12 Interface <span class="DOMInterfaceName">SVGFECompositeElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFECompositeElement</span> interface
corresponds to the <span class="element-name">'feComposite'</span>
element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFECompositeElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
// Composite Operators
const unsigned short SVG_FECOMPOSITE_OPERATOR_UNKNOWN = 0;
const unsigned short SVG_FECOMPOSITE_OPERATOR_OVER = 1;
const unsigned short SVG_FECOMPOSITE_OPERATOR_IN = 2;
const unsigned short SVG_FECOMPOSITE_OPERATOR_OUT = 3;
const unsigned short SVG_FECOMPOSITE_OPERATOR_ATOP = 4;
const unsigned short SVG_FECOMPOSITE_OPERATOR_XOR = 5;
const unsigned short SVG_FECOMPOSITE_OPERATOR_ARITHMETIC = 6;
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedString in2;
readonly attribute SVGAnimatedEnumeration operator;
readonly attribute SVGAnimatedNumber k1;
readonly attribute SVGAnimatedNumber k2;
readonly attribute SVGAnimatedNumber k3;
readonly attribute SVGAnimatedNumber k4;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Composite Operators</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_FECOMPOSITE_OPERATOR_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPOSITE_OPERATOR_OVER</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">over</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPOSITE_OPERATOR_IN</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">in</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPOSITE_OPERATOR_OUT</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">out</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPOSITE_OPERATOR_ATOP</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">atop</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPOSITE_OPERATOR_XOR</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">xor</span>.</td>
</tr>
<tr>
<td valign="top">SVG_FECOMPOSITE_OPERATOR_ARITHMETIC</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">arithmetic</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feComposite'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in2</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in2</span> on
the given <span class="element-name">'feComposite'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">operator</span></dt>
<dd>Corresponds to attribute <span class="attr-name">operator</span> on the given <span class="element-name">'feComposite'</span> element. Takes one of
the Composite Operators.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">k1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">k1</span> on
the given <span class="element-name">'feComposite'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">k2</span></dt>
<dd>Corresponds to attribute <span class="attr-name">k2</span> on
the given <span class="element-name">'feComposite'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">k3</span></dt>
<dd>Corresponds to attribute <span class="attr-name">k3</span> on
the given <span class="element-name">'feComposite'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">k4</span></dt>
<dd>Corresponds to attribute <span class="attr-name">k4</span> on
the given <span class="element-name">'feComposite'</span>
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEConvolveMatrixElement">28.13 Interface <span class="DOMInterfaceName">SVGFEConvolveMatrixElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEConvolveMatrixElement</span>
interface corresponds to the <span class="element-name">'feConvolveMatrix'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEConvolveMatrixElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
// Edge Mode Values
const unsigned short SVG_EDGEMODE_UNKNOWN = 0;
const unsigned short SVG_EDGEMODE_DUPLICATE = 1;
const unsigned short SVG_EDGEMODE_WRAP = 2;
const unsigned short SVG_EDGEMODE_NONE = 3;
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedInteger orderX;
readonly attribute SVGAnimatedInteger orderY;
readonly attribute SVGAnimatedNumberList kernelMatrix;
readonly attribute SVGAnimatedNumber divisor;
readonly attribute SVGAnimatedNumber bias;
readonly attribute SVGAnimatedInteger targetX;
readonly attribute SVGAnimatedInteger targetY;
readonly attribute SVGAnimatedEnumeration edgeMode;
readonly attribute SVGAnimatedNumber kernelUnitLengthX;
readonly attribute SVGAnimatedNumber kernelUnitLengthY;
readonly attribute SVGAnimatedBoolean preserveAlpha;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Edge Mode Values</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_EDGEMODE_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_EDGEMODE_DUPLICATE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">duplicate</span>.</td>
</tr>
<tr>
<td valign="top">SVG_EDGEMODE_WRAP</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">wrap</span>.</td>
</tr>
<tr>
<td valign="top">SVG_EDGEMODE_NONE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">none</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feConvolveMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedInteger</span> <span class="dom-attr-name">orderX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">order</span>
on the given <span class="element-name">'feConvolveMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedInteger</span> <span class="dom-attr-name">orderY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">order</span>
on the given <span class="element-name">'feConvolveMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumberList</span> <span class="dom-attr-name">kernelMatrix</span></dt>
<dd>Corresponds to attribute <span class="attr-name">kernelMatrix</span> on the given element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">divisor</span></dt>
<dd>Corresponds to attribute <span class="attr-name">divisor</span>
on the given <span class="element-name">'feConvolveMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">bias</span></dt>
<dd>Corresponds to attribute <span class="attr-name">bias</span> on
the given <span class="element-name">'feConvolveMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedInteger</span> <span class="dom-attr-name">targetX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">targetX</span>
on the given <span class="element-name">'feConvolveMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedInteger</span> <span class="dom-attr-name">targetY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">targetY</span>
on the given <span class="element-name">'feConvolveMatrix'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">edgeMode</span></dt>
<dd>Corresponds to attribute <span class="attr-name">edgeMode</span> on the given <span class="element-name">'feConvolveMatrix'</span> element. Takes one
of the Edge Mode Types.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">kernelUnitLengthX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">kernelUnitLength</span> on the given <span class="element-name">'feConvolveMatrix'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">kernelUnitLengthY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">kernelUnitLength</span> on the given <span class="element-name">'feConvolveMatrix'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedBoolean</span> <span class="dom-attr-name">preserveAlpha</span></dt>
<dd>Corresponds to attribute <span class="attr-name">preserveAlpha</span> on the given <span class="element-name">'feConvolveMatrix'</span> element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEDiffuseLightingElement">28.14 Interface <span class="DOMInterfaceName">SVGFEDiffuseLightingElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEDiffuseLightingElement</span>
interface corresponds to the <span class="element-name">'feDiffuseLighting'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEDiffuseLightingElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedNumber surfaceScale;
readonly attribute SVGAnimatedNumber diffuseConstant;
readonly attribute SVGAnimatedNumber kernelUnitLengthX;
readonly attribute SVGAnimatedNumber kernelUnitLengthY;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feDiffuseLighting'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">surfaceScale</span></dt>
<dd>Corresponds to attribute <span class="attr-name">surfaceScale</span> on the given <span class="element-name">'feDiffuseLighting'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">diffuseConstant</span></dt>
<dd>Corresponds to attribute <span class="attr-name">diffuseConstant</span> on the given <span class="element-name">'feDiffuseLighting'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">kernelUnitLengthX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">kernelUnitLength</span> on the given <span class="element-name">'feDiffuseLighting'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">kernelUnitLengthY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">kernelUnitLength</span> on the given <span class="element-name">'feDiffuseLighting'</span> element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEDistantLightElement">28.15 Interface <span class="DOMInterfaceName">SVGFEDistantLightElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEDistantLightElement</span>
interface corresponds to the <span class="element-name">'feDistantLight'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEDistantLightElement : SVGElement {
readonly attribute SVGAnimatedNumber azimuth;
readonly attribute SVGAnimatedNumber elevation;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">azimuth</span></dt>
<dd>Corresponds to attribute <span class="attr-name">azimuth</span>
on the given <span class="element-name">'feDistantLight'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">elevation</span></dt>
<dd>Corresponds to attribute <span class="attr-name">elevation</span> on the given <span class="element-name">'feDistantLight'</span> element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEPointLightElement">28.16 Interface <span class="DOMInterfaceName">SVGFEPointLightElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEPointLightElement</span> interface
corresponds to the <span class="element-name">'fePointLight'</span>
element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEPointLightElement : SVGElement {
readonly attribute SVGAnimatedNumber x;
readonly attribute SVGAnimatedNumber y;
readonly attribute SVGAnimatedNumber z;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">x</span></dt>
<dd>Corresponds to attribute <span class="attr-name">x</span> on
the given <span class="element-name">'fePointLight'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">y</span></dt>
<dd>Corresponds to attribute <span class="attr-name">y</span> on
the given <span class="element-name">'fePointLight'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">z</span></dt>
<dd>Corresponds to attribute <span class="attr-name">z</span> on
the given <span class="element-name">'fePointLight'</span>
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFESpotLightElement">28.17 Interface <span class="DOMInterfaceName">SVGFESpotLightElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFESpotLightElement</span> interface
corresponds to the <span class="element-name">'feSpotLight'</span>
element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFESpotLightElement : SVGElement {
readonly attribute SVGAnimatedNumber x;
readonly attribute SVGAnimatedNumber y;
readonly attribute SVGAnimatedNumber z;
readonly attribute SVGAnimatedNumber pointsAtX;
readonly attribute SVGAnimatedNumber pointsAtY;
readonly attribute SVGAnimatedNumber pointsAtZ;
readonly attribute SVGAnimatedNumber specularExponent;
readonly attribute SVGAnimatedNumber limitingConeAngle;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">x</span></dt>
<dd>Corresponds to attribute <span class="attr-name">x</span> on
the given <span class="element-name">'feSpotLight'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">y</span></dt>
<dd>Corresponds to attribute <span class="attr-name">y</span> on
the given <span class="element-name">'feSpotLight'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">z</span></dt>
<dd>Corresponds to attribute <span class="attr-name">z</span> on
the given <span class="element-name">'feSpotLight'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">pointsAtX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">pointsAtX</span> on the given <span class="element-name">'feSpotLight'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">pointsAtY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">pointsAtY</span> on the given <span class="element-name">'feSpotLight'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">pointsAtZ</span></dt>
<dd>Corresponds to attribute <span class="attr-name">pointsAtZ</span> on the given <span class="element-name">'feSpotLight'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">specularExponent</span></dt>
<dd>Corresponds to attribute <span class="attr-name">specularExponent</span> on the given <span class="element-name">'feSpotLight'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">limitingConeAngle</span></dt>
<dd>Corresponds to attribute <span class="attr-name">limitingConeAngle</span> on the given <span class="element-name">'feSpotLight'</span> element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEDisplacementMapElement">28.18 Interface <span class="DOMInterfaceName">SVGFEDisplacementMapElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEDisplacementMapElement</span>
interface corresponds to the <span class="element-name">'feDisplacementMap'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEDisplacementMapElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
// Channel Selectors
const unsigned short SVG_CHANNEL_UNKNOWN = 0;
const unsigned short SVG_CHANNEL_R = 1;
const unsigned short SVG_CHANNEL_G = 2;
const unsigned short SVG_CHANNEL_B = 3;
const unsigned short SVG_CHANNEL_A = 4;
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedString in2;
readonly attribute SVGAnimatedNumber scale;
readonly attribute SVGAnimatedEnumeration xChannelSelector;
readonly attribute SVGAnimatedEnumeration yChannelSelector;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Channel Selectors</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_CHANNEL_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_CHANNEL_R</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">R</span>.</td>
</tr>
<tr>
<td valign="top">SVG_CHANNEL_G</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">G</span>.</td>
</tr>
<tr>
<td valign="top">SVG_CHANNEL_B</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">B</span>.</td>
</tr>
<tr>
<td valign="top">SVG_CHANNEL_A</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">A</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feDisplacementMap'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in2</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in2</span> on
the given <span class="element-name">'feDisplacementMap'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">scale</span></dt>
<dd>Corresponds to attribute <span class="attr-name">scale</span>
on the given <span class="element-name">'feDisplacementMap'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">xChannelSelector</span></dt>
<dd>Corresponds to attribute <span class="attr-name">xChannelSelector</span> on the given <span class="element-name">'feDisplacementMap'</span> element. Takes
one of the Channel Selectors.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">yChannelSelector</span></dt>
<dd>Corresponds to attribute <span class="attr-name">yChannelSelector</span> on the given <span class="element-name">'feDisplacementMap'</span> element. Takes
one of the Channel Selectors.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEFloodElement">28.19 Interface <span class="DOMInterfaceName">SVGFEFloodElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEFloodElement</span> interface
corresponds to the <span class="element-name">'feFlood'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEFloodElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feFlood'</span>
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEGaussianBlurElement">28.20 Interface <span class="DOMInterfaceName">SVGFEGaussianBlurElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEGaussianBlurElement</span>
interface corresponds to the <span class="element-name">'feGaussianBlur'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEGaussianBlurElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedNumber stdDeviationX;
readonly attribute SVGAnimatedNumber stdDeviationY;
void setStdDeviation ( in float stdDeviationX, in float stdDeviationY );
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feGaussianBlur'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">stdDeviationX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">stdDeviation</span> on the given <span class="element-name">'feGaussianBlur'</span> element. Contains
the X component of attribute <span class="attr-name">stdDeviation</span>.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">stdDeviationY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">stdDeviation</span> on the given <span class="element-name">'feGaussianBlur'</span> element. Contains
the Y component (possibly computed automatically) of attribute
<span class="attr-name">stdDeviation</span>.</dd>
</dl>
</dd>
<dt><b>Methods</b></dt>
<dd><dl>
<dt><span class="dom-method-name">setStdDeviation</span></dt>
<dd>Sets the values for attribute <span class="attr-name">stdDeviation</span>.
<dl>
<dt><span class="dom-parameters">Parameters</span></dt>
<dd>
<table border="0" summary="method parameters">
<tbody>
<tr>
<td valign="top">in <span class="dom-parameter-type">float</span> <span class="dom-parameter-name">stdDeviationX</span></td>
<td></td>
<td>The X component of attribute <span class="attr-name">stdDeviation</span>.</td>
</tr>
<tr>
<td valign="top">in <span class="dom-parameter-type">float</span> <span class="dom-parameter-name">stdDeviationY</span></td>
<td></td>
<td>The Y component of attribute <span class="attr-name">stdDeviation</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
<dl>
<dt><span class="dom-no-returnvalue">No Return Value</span></dt>
</dl>
<dl>
<dt><span class="dom-no-exceptions">No Exceptions</span></dt>
</dl>
</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEImageElement">28.21 Interface <span class="DOMInterfaceName">SVGFEImageElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEImageElement</span> interface
corresponds to the <span class="element-name">'feImage'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEImageElement :
SVGElement,
SVGURIReference,
SVGLangSpace,
SVGExternalResourcesRequired,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
};</pre>
</div>
</dd>
<dt> </dt>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedPreserveAspectRatio</span> <span class="dom-attr-name">preserveAspectRatio</span></dt>
<dd>Corresponds to attribute <span class="attr-name">preserveAspectRatio</span> on the given
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEMergeElement">28.22 Interface <span class="DOMInterfaceName">SVGFEMergeElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEMergeElement</span> interface
corresponds to the <span class="element-name">'feMerge'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEMergeElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {};</pre>
</div>
<br></br>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEMergeNodeElement">28.23 Interface <span class="DOMInterfaceName">SVGFEMergeNodeElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEMergeNodeElement</span> interface
corresponds to the <span class="element-name">'feMergeNode'</span>
element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEMergeNodeElement : SVGElement {
readonly attribute SVGAnimatedString in1;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feMergeNode'</span>
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEMorphologyElement">28.24 Interface <span class="DOMInterfaceName">SVGFEMorphologyElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEMorphologyElement</span> interface
corresponds to the <span class="element-name">'feMorphology'</span>
element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEMorphologyElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
// Morphology Operators
const unsigned short SVG_MORPHOLOGY_OPERATOR_UNKNOWN = 0;
const unsigned short SVG_MORPHOLOGY_OPERATOR_ERODE = 1;
const unsigned short SVG_MORPHOLOGY_OPERATOR_DILATE = 2;
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedEnumeration operator;
readonly attribute SVGAnimatedNumber radiusX;
readonly attribute SVGAnimatedNumber radiusY;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Morphology Operators</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_MORPHOLOGY_OPERATOR_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_MORPHOLOGY_OPERATOR_ERODE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">erode</span>.</td>
</tr>
<tr>
<td valign="top">SVG_MORPHOLOGY_OPERATOR_DILATE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">dilate</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feMorphology'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">operator</span></dt>
<dd>Corresponds to attribute <span class="attr-name">operator</span> on the given <span class="element-name">'feMorphology'</span> element. Takes one of
the Morphology Operators.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">radiusX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">radius</span>
on the given <span class="element-name">'feMorphology'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">radiusY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">radius</span>
on the given <span class="element-name">'feMorphology'</span>
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFEOffsetElement">28.25 Interface <span class="DOMInterfaceName">SVGFEOffsetElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEOffsetElement</span> interface
corresponds to the <span class="element-name">'feOffset'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEOffsetElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedNumber dx;
readonly attribute SVGAnimatedNumber dy;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feOffset'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">dx</span></dt>
<dd>Corresponds to attribute <span class="attr-name">dx</span> on
the given <span class="element-name">'feOffset'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">dy</span></dt>
<dd>Corresponds to attribute <span class="attr-name">dy</span> on
the given <span class="element-name">'feOffset'</span>
element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFESpecularLightingElement">28.26 Interface <span class="DOMInterfaceName">SVGFESpecularLightingElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFESpecularLightingElement</span>
interface corresponds to the <span class="element-name">'feSpecularLighting'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFESpecularLightingElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedNumber surfaceScale;
readonly attribute SVGAnimatedNumber specularConstant;
readonly attribute SVGAnimatedNumber specularExponent;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feSpecularLighting'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">surfaceScale</span></dt>
<dd>Corresponds to attribute <span class="attr-name">surfaceScale</span> on the given <span class="element-name">'feSpecularLighting'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">specularConstant</span></dt>
<dd>Corresponds to attribute <span class="attr-name">specularConstant</span> on the given <span class="element-name">'feSpecularLighting'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">specularExponent</span></dt>
<dd>Corresponds to attribute <span class="attr-name">specularExponent</span> on the given <span class="element-name">'feSpecularLighting'</span> element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFETileElement">28.27 Interface <span class="DOMInterfaceName">SVGFETileElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFETileElement</span> interface
corresponds to the <span class="element-name">'feTile'</span> element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFETileElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feTile'</span> element.</dd>
</dl>
</dd>
</dl>
<br></br>
<h3 id="InterfaceSVGFETurbulenceElement">28.28 Interface <span class="DOMInterfaceName">SVGFETurbulenceElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFETurbulenceElement</span> interface
corresponds to the <span class="element-name">'feTurbulence'</span>
element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFETurbulenceElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
// Turbulence Types
const unsigned short SVG_TURBULENCE_TYPE_UNKNOWN = 0;
const unsigned short SVG_TURBULENCE_TYPE_FRACTALNOISE = 1;
const unsigned short SVG_TURBULENCE_TYPE_TURBULENCE = 2;
// Stitch Options
const unsigned short SVG_STITCHTYPE_UNKNOWN = 0;
const unsigned short SVG_STITCHTYPE_STITCH = 1;
const unsigned short SVG_STITCHTYPE_NOSTITCH = 2;
readonly attribute SVGAnimatedNumber baseFrequencyX;
readonly attribute SVGAnimatedNumber baseFrequencyY;
readonly attribute SVGAnimatedInteger numOctaves;
readonly attribute SVGAnimatedNumber seed;
readonly attribute SVGAnimatedEnumeration stitchTiles;
readonly attribute SVGAnimatedEnumeration type;
};</pre>
</div>
<br></br>
</dd>
<dt><b>Definition group Turbulence Types</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_TURBULENCE_TYPE_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_TURBULENCE_TYPE_FRACTALNOISE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">fractalNoise</span>.</td>
</tr>
<tr>
<td valign="top">SVG_TURBULENCE_TYPE_TURBULENCE</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">turbulence</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Definition group Stitch Options</b></dt>
<dd><dl>
<dt><b>Defined constants</b></dt>
<dd>
<table border="0" summary="enumeration values">
<tbody>
<tr>
<td valign="top">SVG_STITCHTYPE_UNKNOWN</td>
<td></td>
<td valign="top">The type is not one of predefined types.
It is invalid to attempt to define a new value of this
type or to attempt to switch an existing value to this
type.</td>
</tr>
<tr>
<td valign="top">SVG_STITCHTYPE_STITCH</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">stitch</span>.</td>
</tr>
<tr>
<td valign="top">SVG_STITCHTYPE_NOSTITCH</td>
<td></td>
<td valign="top">Corresponds to value <span class="attr-value">noStitch</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">baseFrequencyX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">baseFrequencyX</span> on the given <span class="element-name">'feTurbulence'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">baseFrequencyY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">baseFrequencyY</span> on the given <span class="element-name">'feTurbulence'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedInteger</span> <span class="dom-attr-name">numOctaves</span></dt>
<dd>Corresponds to attribute <span class="attr-name">numOctaves</span> on the given <span class="element-name">'feTurbulence'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">seed</span></dt>
<dd>Corresponds to attribute <span class="attr-name">seed</span> on
the given <span class="element-name">'feTurbulence'</span>
element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">stitchTiles</span></dt>
<dd>Corresponds to attribute <span class="attr-name">stitchTiles</span> on the given <span class="element-name">'feTurbulence'</span> element. Takes one of
the Stitching Options.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedEnumeration</span> <span class="dom-attr-name">type</span></dt>
<dd>Corresponds to attribute <span class="attr-name">type</span> on
the given <span class="element-name">'feTurbulence'</span>
element. Takes one of the Turbulence Types.</dd>
</dl>
</dd>
</dl>
<div class="new">
<h3 id="InterfaceSVGFEDropShadowElement">28.29 Interface <span class="DOMInterfaceName">SVGFEDropShadowElement</span></h3>
<p>The <span class="DOMInterfaceName">SVGFEDropShadowElement</span> interface
corresponds to the <span class="element-name">'feDropShadow'</span>
element.</p>
<dl>
<dt><br></br>
<b>IDL Definition</b></dt>
<dd>
<div class="idl-code">
<pre>interface SVGFEDropShadowElement :
SVGElement,
SVGFilterPrimitiveStandardAttributes {
readonly attribute SVGAnimatedString in1;
readonly attribute SVGAnimatedNumber dx;
readonly attribute SVGAnimatedNumber dy;
readonly attribute SVGAnimatedNumber stdDeviationX;
readonly attribute SVGAnimatedNumber stdDeviationY;
void setStdDeviation ( in float stdDeviationX, in float stdDeviationY );
};</pre>
</div>
<br></br>
</dd>
<dt><b>Attributes</b></dt>
<dd><dl>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedString</span> <span class="dom-attr-name">in1</span></dt>
<dd>Corresponds to attribute <span class="attr-name">in</span> on
the given <span class="element-name">'feDropShadow'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">dx</span></dt>
<dd>Corresponds to attribute <span class="attr-name">dx</span> on the
given <span class="element-name">'feDropShadow'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">dy</span></dt>
<dd>Corresponds to attribute <span class="attr-name">dy</span> on the
given <span class="element-name">'feDropShadow'</span> element.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">stdDeviationX</span></dt>
<dd>Corresponds to attribute <span class="attr-name">stdDeviation</span>
on the given <span class="element-name">'feDropShadow'</span> element.
Contains the X component of attribute <span class="attr-name">stdDeviation</span>.</dd>
<dt><span class="dom-readonly">readonly</span> <span class="dom-attr-type">SVGAnimatedNumber</span> <span class="dom-attr-name">stdDeviationY</span></dt>
<dd>Corresponds to attribute <span class="attr-name">stdDeviation</span>
on the given <span class="element-name">'feDropShadow'</span> element.
Contains the Y component of attribute <span class="attr-name">stdDeviation</span>.</dd>
</dl>
</dd>
<dt><b>Methods</b></dt>
<dd><dl>
<dt><span class="dom-method-name">setStdDeviation</span></dt>
<dd>Sets the values for attribute <span class="attr-name">stdDeviation</span>.
<dl>
<dt><span class="dom-parameters">Parameters</span></dt>
<dd>
<table border="0" summary="method parameters">
<tbody>
<tr>
<td valign="top">in <span class="dom-parameter-type">float</span> <span class="dom-parameter-name">stdDeviationX</span></td>
<td></td>
<td>The X component of attribute <span class="attr-name">stdDeviation</span>.</td>
</tr>
<tr>
<td valign="top">in <span class="dom-parameter-type">float</span> <span class="dom-parameter-name">stdDeviationY</span></td>
<td></td>
<td>The Y component of attribute <span class="attr-name">stdDeviation</span>.</td>
</tr>
</tbody>
</table>
</dd>
</dl>
<dl>
<dt><span class="dom-no-returnvalue">No Return Value</span></dt>
</dl>
<dl>
<dt><span class="dom-no-exceptions">No Exceptions</span></dt>
</dl>
</dd>
</dl>
</dd>
</dl>
<br></br>
</div>
<h2 id="references1">29 References</h2>
<h3 id="normref">29.1 Normative References</h3>
<dl>
<dt id="ref-NVDL"><strong class="normref">[NVDL]</strong></dt>
<dd><strong>Document Schema Definition Languages (DSDL) — Part 4:
Namespace-based Validation Dispatching Language — NVDL. ISO/IEC FCD
19757-4</strong>, See <a href="http://www.asahi-net.or.jp/~eb2m-mrt/dsdl/">http://www.asahi-net.or.jp/~eb2m-mrt/dsdl/</a>
</dd>
<dt id="ref-PORTERDUFF"><strong class="normref">[PORTERDUFF]</strong></dt>
<dd><strong>Compositing Digital Images</strong>, T. Porter, T. Duff,
SIGGRAPH '84 Conference Proceedings, Association for Computing
Machinery, Volume 18, Number 3, July 1984. </dd>
<dt id="ref-RNG"><strong class="normref">[RelaxNG]</strong></dt>
<dd><strong>Document Schema Definition Languages (DSDL) — Part 2:
Regular grammar- based validation — RELAX NG. ISO/IEC FDIS
19757-2:2002(E)</strong>, J. Clark, <span class="ruby"><span lang="ja" xml:lang="ja" class="rb">村田 真</span> <span class="rp">(</span><span class="rt"><span class="familyname">Murata</span> M.</span><span class="rp">)</span></span>, eds., 12 December 2002. See <a href="http://www.y12.doe.gov/sgml/sc34/document/0362_files/relaxng-is.pdf">http://www.y12.doe.gov/sgml/sc34/document/0362_files/relaxng-is.pdf</a>
</dd>
<dt id="ref-Schema2"><strong class="normref">[Schema2]</strong></dt>
<dd><strong>XML Schema Part 2: Datatypes Second Edition</strong>, P.
Biron, A. Malhotra, eds. W3C, 28 October 2004 (Recommendation). Latest
version available at <a href="http://www.w3.org/TR/xmlschema-2/">http://www.w3.org/TR/xmlschema-2/</a>.
See also <a href="http://www.w3.org/TR/2005/NOTE-xml11schema10-20050511/">Processing
XML 1.1 documents with XML Schema 1.0 processors</a>. </dd>
<dt id="ref-svg11"><strong class="normref">[SVG11]</strong></dt>
<dd><strong>Scalable Vector Graphics (SVG) 1.1 Specification</strong>,
Dean Jackson editor, W3C, 14 January 2003 (Recommendation). See <a href="http://www.w3.org/TR/2003/REC-SVG11-20030114/">http://www.w3.org/TR/2003/REC-SVG11-20030114/</a>
</dd>
</dl>
<h3 id="informref">29.2 Informative References</h3>
<dl>
<dt id="ref-WHATWG"><strong class="informref">[WHATWG]</strong></dt>
<dd><strong>WHATWG HTML5 proposal</strong>, Ian Hickson editor, Google,
22 February 2007 (Proposal). See <a href="http://www.whatwg.org/specs/web-apps/current-work/">http://www.whatwg.org/specs/web-apps/current-work/</a>
</dd>
</dl>
</body>
</html>