[WIP] Use ImageBitmap when possible #1131
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These are much faster than Image object in some browsers, so prefer them when possible.
Found this whilst profiling #1108. Noticed that we were spending a lot of time base64 encoding images and drawing them. So I tried using the newer ImageBitmap objects instead.
This gives a massive performance increase in Firefox (2.7 seconds instead of 5 seconds for my test recording). Unfortunately it seems Chrome has screwed something up here and I get a performance regression there (8 seconds vs 5.5 seconds before).
More investigation is needed, but it looks like it is something worth pursuing.