Web Workers and Canvas

Question

Are web workers allowed to access a canvas object?

Answer 1

Small update, as the question is now more than half a year old:

In Chrome/Chromium 6 you can now send a canvas' ImageData object to a web worker, let the web worker make changes to the object and then write it back to the canvas using putImageData(..).

Google's Chromabrush does it this way, the source-code can be found here:

• Main thread
• Web worker

Update:

The latest development snapshots of Opera (10.70) and Firefox (4.0b1) also support passing ImageData objects to a web worker.

Update 2017:

Actual links from Github (easier to find needed files from Chromabrush):

• Sending imageData to worker
• Receiving data