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POJavaScript memory problem with canvas
 

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  1. POJavaScript memory problem with canvas
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    <p>I'm using <code>getImageData</code>/<code>putImageData</code> on a HTML5 canvas to be able to manipulate a picture. My problem is that the browser never seems to <a href="http://jonelf.posterous.com/lite-gc-men-for-sent" rel="nofollow noreferrer">free any memory</a>. Not until I close the tab (tested in Chrome and Opera).</p> <p>Moved these out of the function: <strike></p> <blockquote> <pre><code> var ctx = document.getElementById('leif').getContext('2d'); var imgd = ctx.getImageData(0,0,width,height); var pix = imgd.data; var rndpixel = 0; </code></pre> <p></strike></p> </blockquote> <p>and the problem disappeared!</p> <pre><code>function infiniteLeif() { for (var i = 0; i&lt;65536; i+=4) { rndpixel=Math.floor(Math.random()*(width*(height-2))+width+4) * 4; pix[rndpixel-wx4] = pix[rndpixel]; pix[rndpixel-wx4+1] = pix[rndpixel+1]; pix[rndpixel-wx4+2] = pix[rndpixel+2]; pix[rndpixel+wx4] = pix[rndpixel]; pix[rndpixel+wx4+1] = pix[rndpixel+1]; pix[rndpixel+wx4+2] = pix[rndpixel+2]; pix[rndpixel-4] = pix[rndpixel]; pix[rndpixel-4+1] = pix[rndpixel+1]; pix[rndpixel-4+2] = pix[rndpixel+2]; pix[rndpixel+4] = pix[rndpixel]; pix[rndpixel+4+1] = pix[rndpixel+1]; pix[rndpixel+4+2] = pix[rndpixel+2]; } ctx.putImageData(imgd,0,0); if (go==1) t=setTimeout(infiniteLeif,40); } </code></pre> <p>A full <a href="http://plea.se/me/leif/canvas_leif.html" rel="nofollow noreferrer">example can be found here</a> (Google Chrome is recommended).</p> <p>It's not the <code>setTimeout</code> that is the problem because I tried a loop with the same effect.</p> <p>I've come to understand that removal of circular references often is the key but do I really have one? How can I change this code so that the <a href="https://stackoverflow.com/questions/864516/what-is-javascript-garbage-collection">JavaScript GC</a> gets a chance to do it's job?</p>
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    1. USJonas Elfström
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      1. POJavaScript memory problem with canvas
      1. USNosredna
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      1. USWouter Lievens
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    1. COI wonder if the canvas is holding onto the pix array. You may want to set it to null before freeing the canvas.
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      1. POJavaScript memory problem with canvas
      1. USJames Black
    2. COYeah, this is weird. trying nulling ALL the variables at the end of the function.
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