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fabric.Image.filters.BaseFilter.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Class: BaseFilter</title>
<script src="scripts/prettify/prettify.js"> </script>
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<div id="main">
<h1 class="page-title">Class: BaseFilter</h1>
<section>
<header>
<h2>
<span class="ancestors"><a href="fabric.html">fabric</a><a href="fabric.Image.html">.Image</a><a href="fabric.Image.filters.html">.filters</a>.</span>BaseFilter</h2>
</header>
<article>
<div class="container-overview">
<h4 class="name" id="BaseFilter"><span class="type-signature"></span>new BaseFilter<span class="signature">()</span><span class="type-signature"></span></h4>
<div class="description">
Root filter class from which all filter classes inherit from
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line19456">line 19456</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<h4 class="name" id="type"><span class="type-signature"></span>type<span class="type-signature"></span></h4>
<div class="description">
Filter type
</div>
<dl class="details">
<dt class="tag-default">Default Value:</dt>
<dd class="tag-default"><ul class="dummy">
<li>BaseFilter</li>
</ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line19468">line 19468</a>
</li></ul></dd>
</dl>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="applyTo"><span class="type-signature"></span>applyTo<span class="signature">(options)</span><span class="type-signature"></span></h4>
<div class="description">
Apply this filter to the input image data provided.
Determines whether to use WebGL or Canvas2D based on the options.webgl flag.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
<h6>Properties</h6>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>passes</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">The number of filters remaining to be executed</td>
</tr>
<tr>
<td class="name"><code>webgl</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="description last">Whether to use webgl to render the filter.</td>
</tr>
<tr>
<td class="name"><code>sourceTexture</code></td>
<td class="type">
<span class="param-type">WebGLTexture</span>
</td>
<td class="description last">The texture setup as the source to be filtered.</td>
</tr>
<tr>
<td class="name"><code>targetTexture</code></td>
<td class="type">
<span class="param-type">WebGLTexture</span>
</td>
<td class="description last">The texture where filtered output should be drawn.</td>
</tr>
<tr>
<td class="name"><code>context</code></td>
<td class="type">
<span class="param-type">WebGLRenderingContext</span>
</td>
<td class="description last">The GL context used for rendering.</td>
</tr>
<tr>
<td class="name"><code>programCache</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">A map of compiled shader programs, keyed by filter type.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line19647">line 19647</a>
</li></ul></dd>
</dl>
<h4 class="name" id="applyToWebGL"><span class="type-signature"></span>applyToWebGL<span class="signature">(options)</span><span class="type-signature"></span></h4>
<div class="description">
Apply this filter using webgl.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
<h6>Properties</h6>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>passes</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">The number of filters remaining to be executed</td>
</tr>
<tr>
<td class="name"><code>webgl</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="description last">Whether to use webgl to render the filter.</td>
</tr>
<tr>
<td class="name"><code>originalTexture</code></td>
<td class="type">
<span class="param-type">WebGLTexture</span>
</td>
<td class="description last">The texture of the original input image.</td>
</tr>
<tr>
<td class="name"><code>sourceTexture</code></td>
<td class="type">
<span class="param-type">WebGLTexture</span>
</td>
<td class="description last">The texture setup as the source to be filtered.</td>
</tr>
<tr>
<td class="name"><code>targetTexture</code></td>
<td class="type">
<span class="param-type">WebGLTexture</span>
</td>
<td class="description last">The texture where filtered output should be drawn.</td>
</tr>
<tr>
<td class="name"><code>context</code></td>
<td class="type">
<span class="param-type">WebGLRenderingContext</span>
</td>
<td class="description last">The GL context used for rendering.</td>
</tr>
<tr>
<td class="name"><code>programCache</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">A map of compiled shader programs, keyed by filter type.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line19687">line 19687</a>
</li></ul></dd>
</dl>
<h4 class="name" id="createHelpLayer"><span class="type-signature"></span>createHelpLayer<span class="signature">()</span><span class="type-signature"></span></h4>
<div class="description">
If needed by a 2d filter, this functions can create an helper canvas to be used
remember that options.targetCanvas is available for use till end of chain.
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="fabric.js.html">fabric.js</a>, <a href="fabric.js.html#line19744">line 19744</a>
</li></ul></dd>
</dl>
<h4 class="name" id="createProgram"><span class="type-signature"></span>createProgram<span class="signature">(gl, fragmentSource, vertexSource)</span><span class="type-signature"></span></h4>
<div class="description">
Compile this filter's shader program.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>gl</code></td>
<td class="type">
<span class="param-type">WebGLRenderingContext</span>
</td>
<td class="description last">The GL canvas context to use for shader compilation.</td>
</tr>
<tr>
<td class="name"><code>fragmentSource</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">fragmentShader source for compilation</td>
</tr>
<tr>
<td class="name"><code>vertexSource</code></td>
<td class="type">
<span class="param-type">String</span>