scrawl-canvas
Version:
Version 8.9.4 - 19 Nov 2022
151 lines (120 loc) • 4.88 kB
HTML
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Demo Filters 001</title>
<link href="css/normalize.css" rel="stylesheet" />
<link href="css/tests.css" rel="stylesheet" />
<style>
#my-image-store {
display: none;
}
.controls {
grid-template-columns: 1fr 2fr 1fr 2fr;
}
</style>
</head>
<body>
<h1><a href="index.html">Scrawl-canvas v8</a> - Filters test 001</h1>
<h2>Parameters for: Blur, Gaussianblur filters; filter memoization</h2>
<h3>To change image, drag-and-drop an image file over the canvas</h3>
<div class="controls">
<div class="lavender label">Blur</div>
<div class="lavender">
<select class="controlItem" id="blurFilter">
<option value="blurFilter">Legacy Blur</option>
<option value="gaussianBlurFilter">Gaussian blur</option>
</select>
</div>
<div class="lavender label">Opacity</div>
<div class="lavender"><input class="controlItem" id="opacity" type="range" value="1" min="0" max="1" step="0.01" /></div>
<div class="yellow label">Radius</div>
<div class="yellow"><input class="controlItem" id="radius" type="range" value="10" min="0" max="60" step="1" /></div>
<div class="yellow label">Passes</div>
<div class="yellow"><input class="controlItem" id="passes" type="range" value="1" min="0" max="10" step="1" /></div>
<div class="yellow label">Step</div>
<div class="yellow"><input class="controlItem" id="step" type="range" value="1" min="1" max="20" step="1" /></div>
<div class="yellow label">Exclude transparent pixels</div>
<div class="yellow">
<select class="controlItem" id="excludeTransparentPixels">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
<div class="pink label">Include red</div>
<div class="pink">
<select class="controlItem" id="includeRed">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
<div class="green label">Include green</div>
<div class="green">
<select class="controlItem" id="includeGreen">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
<div class="blue label">Include blue</div>
<div class="blue">
<select class="controlItem" id="includeBlue">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
<div class="lavender label">Include alpha</div>
<div class="lavender">
<select class="controlItem" id="includeAlpha">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
<div class="lavender label">Process horizontal</div>
<div class="lavender">
<select class="controlItem" id="processHorizontal">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
<div class="lavender label">Process vertical</div>
<div class="lavender">
<select class="controlItem" id="processVertical">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
<div class="yellow label">Memoize filter</div>
<div class="yellow">
<select class="controlItem" id="memoizeFilterOutput">
<option value="0">false</option>
<option value="1">true</option>
</select>
</div>
</div>
<canvas
id="mycanvas"
width="400"
height="400"
data-scrawl-canvas
></canvas>
<p id="reportmessage"></p>
<div class="testinfo">
<h4>Test purpose</h4>
<ul>
<li>Create a test Picture entity</li>
<li>Create a blur filter and apply it to the test entity</li>
<li>Update filter attributes and observe the effect they have on the entity</li>
</ul>
<p><b>Known issue:</b> Filter memoization will, sometimes, kill Safari-based browsers for as-yet-unknown reasons - it appears to cause the the getImageData() invocation on line 595 in mixin/entity.js to go from taking a a handful of milliseconds to over 5 seconds, but only after an element's <i>memoizeFilterOutput</i> flag has been set to true.</p>
<p>For now, if Scrawl-canvas detects that the user is viewing the canvas in a Safari-based browser, it will ignore requests to memoize filters. Use cache output functionality instead to improve render speeds.</p>
<p><b>Touch test:</b> not required</p>
<p><a href="../docs/demo/filters-001.html">Annotated code</a></p>
</div>
<div id="my-image-store">
<img id="iris" src="img/iris.png" class="flowers" />
</div>
<script src="filters-001.js" type="module"></script>
</body>
</html>