1716344 - Lines and text are missing on high contrast

Status: RESOLVED WORKSFORME

(Firefox :: PDF Viewer, defect, P3)

Description

[Raluca Popovici, Desktop QA]

Attachment: 2021-06-14_14h48_33.png

Tested with:
Nightly 91.0a1 (2021-06-13)

Tested on:
Win 10

Preconditions:
In about:config, set pdfjs.enableXfa = true

Steps:

1. Turn on the Hight Contrast(White/Black) on your system
2. Launch firefox
3. Open the following pdf: https://bug1671648.bmoattachments.org/attachment.cgi?id=9182033

Actual result:
Few lines of the table and date format text of the form are missing with hight contrast white.
On High Contrast Black is more difficult to read the text.

Expected result:
The lines of the table/date format text of the form should be properly displayed on high contrast high mode
The text should be readable on High Contrast Black mode

Comment 1

[Raluca Popovici, Desktop QA]

Attachment: 2021-06-14_14h50_29.png

Comment 2

[Daniel Bodea [:danibodea]]

This issue occurs just the same in Windows 7 while it does not occur in Mac OS 11.4 or Ubuntu 20.

Comment 3

[Morgan Reschenberg [:morgan]]

This might have to do with backplating -- does the issue change/resolve if you set browser.display.permit_backplate to false in about:config?

Comment 4

[Daniel Bodea [:danibodea]]

(In reply to Morgan Reschenberg [:morgan] from comment #3)

This might have to do with backplating -- does the issue change/resolve if you set browser.display.permit_backplate to false in about:config?

No, disabling that pref will make it worse when using High Contrast Black: All text disappears and about the same when using High Contrast White.

Comment 5

[Emilio Cobos Álvarez (:emilio)]

Is this fixed on Nightly Dani?

Comment 6

[Daniel Bodea [:danibodea]]

The render of the attached PDF is considerably better in Nightly v92.0a1 from 2021-08-02, but it still shows minor issues with missing borders or partialy displayed text. So minor that I will choose to ignore them. The PDF is now aesthetic.

It appears that more releases has influenced how the PDF renders in High Contrast White:

1. most of the missing borders and cut text has started being displayed after:
   Bug 1719380 - Update pdf.js to version 2.10.263 r=pdfjs-reviewers,marco
   Differential Revision: https://phabricator.services.mozilla.com/D119237
2. Some more of the missing borders and a highlight for the input fields:
   Bug 1722768 - Update pdf.js to version 2.11.22 r=pdfjs-reviewers,marco
   Differential Revision: https://phabricator.services.mozilla.com/D121125

It is the same for both Win10 and Win7.
Please set this bug as fixed.