context2d

Hello,

I would like to ask for a new feature in current context2d specification.

Can you please add new parameter to "getImageData", which is ability to
give it my own ImageData container?

Current getImageData always creates a new ImageData. When calling it too
often, a lot of garbage is created, garbage collection takes a lot of CPU
time. It will be nice to be able to recycle a single container (instance of
ImageData).

Thank you. Best regards
Ivan Kuckir