- From: Franz Buchinger <fbuchinger@gmail.com>
- Date: Sat, 5 Dec 2009 13:24:36 +0100
Gears introduced the concept of an "offscreen canvas" that doesn't draw anything in the browser window, but can be used to manipulate images in a web worker. I used this functionality to implement a "resize-before-upload" feature in my photo gallery uploader. Now I'm trying to port my uploader to HTML5 but there seems no way to delegate the scaling work to a HTML5 web worker. Surely I could use the DOM canvas to scale down the photos in the main "browser thread", but this means that the UI gets blocked during this process. If the user chooses more than a few multi-megapixel photos, the CPU-intensive downscaling will likely freeze the browser and trigger a script abortion warning. Are there plans to introduce an "offscreen canvas" in html5? If not, which workarounds are possible? kind regards, Franz -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.whatwg.org/pipermail/whatwg-whatwg.org/attachments/20091205/dfc2b925/attachment-0001.htm>
Received on Saturday, 5 December 2009 04:24:36 UTC