1646354 - bookmarks menu > scroll font rendering

Status: UNCONFIRMED

(Core :: Graphics: Text, defect)

Description

[cebz]

Attachment: firefox bookmarks font rendering.gif

User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:77.0) Gecko/20100101 Firefox/77.0

Steps to reproduce:

1. Open Firefox 77.0.1 x64 in Windows 8.1 x64 with Intel HD IGP
2. Open bookmarks menu
3. Scroll bookmarks menu

Actual results:

If scroll then font rendering/focus change after 3 second aprox. It's so annoying.

This happens when "menu font" is changed from Segoe UI (standard) to Arial in Windows 8.1. If "menu font" is Segoe UI then bookmarks font is fine when scrolling.

Safe mode, not HWA, not direct2d accel, not addons don't resolve it.

3 photos attached.

Expected results:

Bookmarks menu font rendering should NOT change when scrolling like with Windows default menu font.

Comment 1

[Jamie Nicol [:jnicol]]

Thank you for the report. Could you please attach a copy of your about:support page?

Do you know if this affects other fonts as well, or just Arial? Do you know if this has always been the case or whether it is a recent regression? If it's a regression, would you be able to use mozregression to find out what has caused it?

Comment 2

[cebz]

(In reply to Jamie Nicol [:jnicol] from comment #1)

Thank you for the report. Could you please attach a copy of your about:support page?

Do you know if this affects other fonts as well, or just Arial? Do you know if this has always been the case or whether it is a recent regression? If it's a regression, would you be able to use mozregression to find out what has caused it?

Hello,

thank you all for your suppport and work.

I attach about:support log (html and txt, I tryed to print to pdf but it fails) and one gif with possible error.

I normally use Win7, last times Win8.1, I see this issue some time ago with 8.1. I did some test:

Win8.1 x64 + Firefox 77.01 x64 (full config and clean install) = FAIL issue YES present.
-> Firefox 70.0 clean install = FAIL -> 60.0 = FAIL -> 50.0 =OK then 51.0 = FAIL
Looks like it is some change from 51.0 and new with font rendering.

This issue is NOT present with Win7 SP1 x86 +Firefox 77.0.1 x86 (probably x64 too ok).

I analised with simple zoom Windows utility pixel changes between Firefox 50.0 and 51.0...77.0.1 and I see different font draw when bookmarks menu is open -> scroll -> stop. 50.0 use the same font rendering (three color always , RGB?) and 51.0 and new use RGB -> back-gray Grayscale? -> RGB this is the change.

Looking for 51.0 changes from 50.0 I see some things that might be the reason:

• Improved video performance for users without GPU acceleration for less CPU usage and a better full screen experience
• Added support for WebGL 2, with advanced graphics rendering features like transform feedback, improved texturing capabilities, and a new sophisticated shading language
• Use 2D graphics library (Skia) for content rendering on Linux (I think not because in Windows)

Regards.

Comment 3

[cebz]

Attachment: about-support html and txt.zip

Comment 4

[cebz]

Attachment: firefox50 vs next.gif

Comment 5

[cebz]

About mozregression I have not idea, but if it's neccessary tell me and I can try to learn it.

Comment 6

[cebz]

All fonts afected, some more than others.

Standard Segoe UI too after recheck it with zoom. (I don't know how edit previous post to write all there)

Comment 7

[Jamie Nicol [:jnicol]]

To use mozregression, you can download and install mozregression-gui.exe from this page. Then launch the app, click the scissor icon (in English it's called "Run a new bisection"), and click next to accept the default options on the first two screens ("Basic configuration" and "Profile selection"). On the third screen "Build selection", you want to change "Last known good build" to a release and 50. And "First known bad build" to release and 51.

Then versions of firefox will automatically be downloaded and launched. For each one you just need to say whether it is good or bad. Eventually it will finish, and if you could copy the output to here that would be great. Let me know if you run in to any problems!

Comment 8

[cebz]

Thanks Jamie.

I attach mozregression results about bookmarks menu tests. After 2016-09-15 build it tryed to build more but it said "Unable to find enought data to bisect".

51.0a1 2016-09-15 OK

In other hand I see other similar font rendering issue with Firefox Main Menú, but transition grayscale-rgb is faster than bookmarks menu and different steps draw (3 in bookmarks menu and 2 in main menu). This issue is present in actual 77.0.1 and good 51.0a1 2016-09-15. It may be related with different font or direct2d? rendering between Win7 (good) and Win8.x (bad).

Comment 9

[cebz]

Attachment: mozregre test 51 nightly.PNG

Comment 10

[cebz]

Update:

I can confirm same issue with Windows 10 LSTB (10.0.14.393) and I suppose all versions.