924093 - Letters are rendered randomly bold in PDF

Status: RESOLVED DUPLICATE of bug 921465

(Firefox :: PDF Viewer, defect)

Description

[David Balažic]

Attachment: examplePDF.png

Opening the URL in Firefox 24 shows the document with bad text rendering.
See screenshot.

Comment 1

[David Balažic]

Attachment: The problematic PDF

I attach the PDF for the case it is not available any more on the original location.

Comment 2

[Petruta Horea [:phorea], Desktop QA]

I couldn't reproduce the issue using latest Aurora and Fx 24 en-US build. 
Are you using a locale Firefox version?

Can you reproduce this issue in safe mode? How about on a clean profile?
http://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
http://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Thanks

Comment 3

[David Balažic]

What do you mean by "locale Firefox version"?
It is the US_EN version.

I tried a different profile and there it works OK.
I also tried FF on another PC (running WinXP) and there the same problem happens.

I'll attach a list of addons in the problem profile.

Comment 4

[David Balažic]

Attachment: addons.png

List of addons in the profile where the problem happens.

Note: the Trouble free profile has these two add-ons (the plugins are same as they are per PC, not per user profile):
 - Dictionary for the Slovene language 0.1.1.1
 - Lazarus: Form Recovery 2.3

Comment 5

[David Balažic]

The problem persists even after disabling all add-ons (and restarting FF).
I did that on the WinXP machine (that I access over Remote Desktop).
On this machine in the 100% zoom level (smaller zooms do not exibit the problem), only the letters l and i are rendered bolder that the rest. Increasing the zoom level (enlarging the image) makes more and more letters bolder than the rest.

Comment 6

[Loic]

I think it's related to HWA. With HWA disabled, I'm able to reproduce it.
And I guess on your Win XP machine, there is no HWA enabled by default, so the issue is visible.

Comment 7

[David Balažic]

On my Windows 8 system the problem does not happen, with HWA on or off.

Comment 8

[Masatoshi Kimura [:emk]]

Confirmed on WinXP SP3 with HWA enabled, Japanese Windows
I guess this is a fallout from <https://github.com/mozilla/pdf.js/pull/3209>.

Comment 9

[Masatoshi Kimura [:emk]]

https://github.com/mozilla/pdf.js/issues/3563 ?
This is especially severe on Japanese Windows because its default serif font (MS Mincho) is rendered without ClearType. There is no way to enable ClearType for East-Asian fonts if the font contains embedded bitmap.