Corrupted PDF display under Crostini (ChromeOS Linux container)

[msiniscalchi]

Attach (recommended) or Link to PDF file here:
Using the demo PDF on the pdf.js website

Configuration:

• Chromium Version 79.0.3945.130 (Developer Build) built on Debian 10.2, running on Debian 10.2 (64-bit)
• Operating system and its version: Debian Buster running in the ChromeOS Linux default container ("Crostini")
• PDF.js version: whatever version the demo on the PDF.js web page uses
• Is a browser extension: NO

Steps to reproduce the problem:

1. Go to the PDF.js webpage
2. Click "Demo"

What is the expected behavior? (add screenshot)

PDF is displayed correctly

What went wrong? (add screenshot)
Most characters are simply not displayed.

Comments: I originally found out about this problem using the VScode LaTeX Workshop extension, which uses pdf.js to display PDF files produced by LaTeX. I was having the same issue with my own files---most characters just were not displayed. However, as shown above, the exact same behavior occurs when running a browser under Crostini.

If I instead visit the pdf.js website using Chrome, NOT within the Crostini container but under "regular" ChromeOS, everything works perfectly.

[Snuffleupagus]

This does look more like a <canvas> and/or Font loading bug in the platform/browser itself, rather than a general PDF.js library issue (since otherwise you'd expect it to be broken everywhere).

[msiniscalchi]

Hm. Interesting. Indeed things seem to work using Firefox-esr (68.4.1esr 64-bit). See attached screenshot. So this seems to be a Chromium-on-Crostini-specific issue. As I mentioned in the original message, the issue dues not arise with the standard Chrome browser in ChromeOS . It does however arise with Chromium 79, and with the Chromium engine built into VSCode.

[timvandermeij]

This doesn't look like something that can be fixed on the PDF.js side. It's best to report the issue to the Chrostini developers.