- From: <bugzilla@jessica.w3.org>
- Date: Wed, 14 Jul 2010 21:01:17 +0000
- To: public-html-bugzilla@w3.org
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10169
Aryeh Gregor <Simetrical+w3cbug@gmail.com> changed:
What |Removed |Added
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CC| |Simetrical+w3cbug@gmail.com
--- Comment #1 from Aryeh Gregor <Simetrical+w3cbug@gmail.com> 2010-07-14 21:01:17 ---
Document showing lack of interop:
data:text/html,<!doctype html>
<canvas height="300" width="300"></canvas>
<script>
window.addEventListener('load', function () {
context = document.getElementsByTagName("canvas")[0].getContext("2d");
context.shadowBlur = 50;
context.shadowColor = 'black';
context.fillRect(100, 100, 100, 100); }, false);
</script>
This looks distinctly different in fairly recent WebKit, Gecko, and Presto
(Chrome dev, Firefox 4b1, Opera 10.60). From reading the specs, not knowing
anything about Gaussian blurs, I'd think it should look the same as:
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg"><defs>
<filter id="Gaussian_Blur"><feGaussianBlur in="SourceGraphic"
stdDeviation="5"/></filter>
</defs>
<rect x="100" y="100" width="100" height="100"
style="fill:black;filter:url(#Gaussian_Blur)"/>
</svg>
which Chrome and Opera render identically to one another, but very different to
how they render the canvas. So it should be safe to change the algorithm here
substantially. Although probably not to the point of matching SVG, on second
thought, since that's very different from what anyone does now for canvas (by
an order of magnitude in this case).
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Received on Wednesday, 14 July 2010 21:01:19 UTC