Get raw data from canvas

[ggolda]

Hello!
I need to extract a series of raw pixel buffers from canvas and currently I have no idea how to do that properly. toBuffer method doesn't return raw pixel buffer and context.getImageData takes a lot of time to return a pixel array (around 130-140ms on my machine).

Is there an efficient way how to do that? Maybe in C style where I just pass pre-allocated Buffer to skia-canvas and it writes pixels back to me?

[ggolda]

Hm, after further tests it looks like context.getImageData itself is fast if you do simple draws on a canvas before requesting data.

But if I call context.drawImage and context.getImageData after then it become incredibly slow (130-150ms).