1374225 - blurry ClearType font in Windows XP

Status: RESOLVED WONTFIX

(Thunderbird :: Mail Window Front End, defect)

Description

[krasnyitoster]

Attachment: sglazh.PNG

User Agent: Mozilla/5.0 (Windows NT 10.0; rv:47.0) Gecko/20100101 Firefox/47.0
Build ID: 20160623154057

Steps to reproduce:

1. Install Windows XP SP3 with latest updates. Options by default.
2. Install Thunderbird 52.2.0. Options by default.


Actual results:

Font seems blurry in main window, in calendar, preferences and other interface of Thunderbird.
Hardware anti-aliasing option in Thunderbird will not affect for the result.


Expected results:

Font should be not blurred.

Comment 1

[Wayne Mery (:wsmwk)]

Such an issue was fixed in bug 1345222 and should havfe been gone I think in 52.1.0.
Unless you are seeing a different issue in https://mzl.la/2sNXOSF

Comment 2

[krasnyitoster]

(In reply to Wayne Mery (:wsmwk, NI for questions) from comment #1)
> Such an issue was fixed in bug 1345222 and should havfe been gone I think in
> 52.1.0.
> Unless you are seeing a different issue in https://mzl.la/2sNXOSF
I think, it is not exactly this.
My bug is for Windows XP only. I have no problem in Windows 7 and 10.
I have problem with all 52.x.x versions, including last stable 52.2.0.

Comment 3

[rsx11m]

That may be an issue with the skia rendering now preferred over cairo, which may lead to fuzzy rendering even with ClearType switched off (I assume that hardware rendering is disabled on your machine, which should be indicated in Help > Troubleshooting Information).

You can switch the order by going into the Options (from the Tools menu or the [≡] button), Advanced and then General tab. Hit Config Editor and confirm the warning. Enter "gfx." into the search bar and change the variables as follows:

   gfx.canvas.azure.backends = direct2d1.1,cairo,skia  (from direct2d1.1,skia,cairo)
   gfx.content.azure.backends = direct2d1.1,cairo

Other options that may inpact font rendering with hardware acceleration enabled:

   gfx.direct2d.disabled = true  (from false)

   layers.acceleration.disabled = true   (disables hardware acceleration, which may not
                                          be enabled on your machine to start with if it
                                          has an older graphics card or driver)
Hopefully either of those helps.

Comment 4

[rsx11m]

... and, restart Thunderbird once you've made a change to see its effect (may not be immediate).

Comment 5

[Wayne Mery (:wsmwk)]

Like bug 1358078 comment 4 => Wontfix