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POCanvas drawImage throws INDEX_SIZE_ERR when run locally, but not from the web
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2011-09-18T03:09:09.597
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2011-09-19T00:32:21.573
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2011-09-18T15:04:05.940
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I'm running through the MDN tutorials, using the <a href="https://developer.mozilla.org/samples/canvas-tutorial/3_3_canvas_drawimage.html" rel="nofollow">drawImage method for slicing an image</a>. The stripped down page code looks like: <pre><code> <html> <head> <script type="application/x-javascript"> function draw() { var ctx = document.getElementById('canvas').getContext('2d'); ctx.drawImage(document.getElementById('frame'),0,0); ctx.drawImage(document.getElementById('source'),33,71,104,124,21,20,87,104); } </script> </head> <body onload="draw();"> <canvas id="canvas" width="150" height="150"></canvas> <img id="source" src="images/rhino.jpg" width="300" height="227" alt=""> <img id="frame" src="images/picture_frame.png" width="132" height="150" alt=""> </body> </html> </code></pre> When the full version is run from the MDN website, it works as expected. When copied to my local machine and loaded from a "file:///" url (with correct relative pathing for images), this throws an INDEX_SIZE_ERR on the drawImage...'source' line. Images load as expected through the img tags. Assigning the <code>document.getElementById('source')</code> to a variable and passing that variable to <code>drawImage</code> shows that the variable is non-null and has classWidth of 300 (through a simple <code>alert</code>), and still throws the error. The <code>ctx.drawImage(document.getElementById('frame'),0,0);</code> line does draw to the canvas correctly. Why is my local machine behaving differently than the web version? Security restrictions? (Newbie here, apologies if the answer is simple.)
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<javascript><html5><canvas>
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Canvas drawImage throws INDEX_SIZE_ERR when run locally, but not from the web
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