1998618 - Font isn't correctly rendered

Status: RESOLVED FIXED

(Firefox :: PDF Viewer, defect, P3)

Description

[Calixte Denizet (:calixte)]

Attachment: Misrendered file

STR:

• open the file: https://github.com/user-attachments/files/23383534/test.1.pdf

The text isn't rendered as it must.

It's very likely a regression because of:
https://github.com/mozilla/pdf.js/pull/20197

Comment 1

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

Set release status flags based on info from the regressing bug 1991193

Comment 2

[Calixte Denizet (:calixte)]

The pdf contains a font with some characters outside of the range [0x0000-0xFFFF] and when writing the cmap we use the format 4 which is supposed to only handle characters in this range !
For this specific font, a format 8 would have been better:
https://learn.microsoft.com/en-us/typography/opentype/spec/cmap#format-8-mixed-16-bit-and-32-bit-coverage

Anyway, we should understand why it was "correctly" failing before the PR #20197 because thanks to this failure we were able to fallback on a browser font.

Comment 3

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

Set release status flags based on info from the regressing bug 1991193