A very popular use case for Flash is to write pixel art games. This is made possible by a fast copyPixels method on BitmapData class: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/BitmapData.html#copyPixels%28%29 Flash game authors compose multiple BitmapData regions into a larger BitmapData and then draw it scaled with linear sampling. Currently this can be achieved with CanvasRenderingContext2D.drawImage but this is not available in Workers. Having such a feature on ImageData would make it possible to write such games entirely in Workers. Another possibility is to provide an additional view on ArrayBuffers, perhaps a PixelArray view that has low level block pixel operations like fillRect, copyRect, etc.

We need to triage whether this is needed at all anymore. In any case, it's not GFX-related, really.

Would still be nice, but is not critical at all for our initial release.