1961423 - Using "Save to PDF" corrupts glyph in other PDF viewers

Status: RESOLVED FIXED

(Firefox :: PDF Viewer, defect, P1)

Description

[Laurenz Stampfl]

Attachment: original.pdf

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.0) Gecko/20100101 Firefox/137.0

Steps to reproduce:

I have a simple PDF file "original.pdf" which displays fine in any PDF viewer. I opened the PDF in Firefox and resaved it by pressing "Print" and "Save to PDF".

Actual results:

The resaved PDF still displays fine when opening in Firefox, but when trying any other viewer (Chrome, Apple Preview and Acrobat), the first glyph suddenly ends up being displayed as a .notdef glyph.

Expected results:

The text should still display fine in any PDF viewer.

Comment 1

[Laurenz Stampfl]

Attachment: The resaved PDF

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Firefox::PDF Viewer' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Ardelean Oana, Desktop Test Engineering [:oardelean]]

Hello, thank you for the bug report!
Managed to reproduce this issue using:

• Firefox Nightly 139.0a1;
• Firefox 138.0;

Tested on macOS 14. Could not reproduce on Windows 10 (with Adobe Acrobat Reader) or Ubuntu 22 (with Document Viewer).

Setting as NEW so the developing team can have a look.

Comment 4

[Calixte Denizet (:calixte)]

The used font is a CFF one and we rewrite it a bit in order to make it usable in Firefox.
The last version of ttx was failing and a way to fix the failure is to change the nLeftvalue here:
https://github.com/mozilla/pdf.js/blob/91175dc67d13addbc0c172858fb87bae8c8212af/src/core/cff_parser.js#L1769-L1779
which is supposed to be the number of glyphs in the range except the first one.
And fixing the ttx failure is fixing this bug in Firefox too.

Comment 5

[BMO Github Automation]

Attachment: [mozilla/pdf.js] Fix 'print to pdf' on Mac with a cid font (bug 1961423) (#19862)