Locking up on Konva (Canvas) Applications

[abrahamfathman]

Description

Chrome browser tab becomes unresponsive. A dialog saying 'Page Unresponsive' is shown with the choice to 'Exit Page' or 'Wait'

Steps to Reproduce

1. Go to a site that is using Konva - like their demo here: https://konvajs.org/docs/sandbox/Free_Drawing.html
2. Try to scroll up and down on the web page

Expected behavior:
The web page will be responsive and you can see the HTML Canvas elements functioning.

Actual behavior:
Within 10 seconds, the browser page becomes unresponsive.

Versions

• Extension: 2021.3.2
• Browser: Chrome: 88.0.4324.192 (Official Build) (x86_64)
• OS: Mac

Additional Information

This is repeatable every time.
This started with version 2021.3.2.

[jonathanKingston]

Thanks for the report!

this.hitCanvas.context.getImageData(Math.round(pos.x * ratio), Math.round(pos.y * ratio), 1, 1).data

I'm seeing this as the source of the troubles, I think it's because the subset of the canvas data we are modifying.