786845 - Fonts changing appearance / cleartype on/off/buggy

Status: RESOLVED WORKSFORME

(Core :: Graphics: Text, defect)

Description

[Leonardo Pereira]

Attachment: the bug

User Agent: Mozilla/5.0 (Windows NT 6.2; rv:15.0) Gecko/20100101 Firefox/15.0
Build ID: 20120824154833

Steps to reproduce:

browsing a page and passing my pointer over button and image elements on page


Actual results:

the fonts appear to turn cleartype on/off ramdomly and sometimes, texts from other places of the page goes on the other


Expected results:

reder the fonts properly

Comment 1

[Loic]

Maybe an issue with Windows 8 and font rendering.

Could you try with hardware acceleration disabled, please. (options > advanced > general, then restart FF).

In addition, attach here the section about:support > graphics.

Similar bug: https://bugzilla.mozilla.org/show_bug.cgi?id=760299

Comment 2

[Leonardo Pereira]

I've disabled hardware acceleration but still the same. I've tried to make the bug cases in Chrome and IE and there the text is ok


My graphics properties are in portuguese, but I think you can understand


Gráficos
        Descrição do adaptador
        Intel(R) G41 Express Chipset (Microsoft Corporation - WDDM 1.1)

        ID do fornecedor
        0x8086

        ID do dispositivo
        0x2e32

        RAM do adaptador
        Unknown

        Drivers do adaptador
        igdumd32 igd10umd32

        Versão do driver
        8.15.10.2702

        Data do driver
        3-24-2012

        Direct2D ativo
        false

        DirectWrite ativo
        false (6.2.9200.16384)

        Parâmetros ClearType
        Parâmetros ClearType não encontrados

        Renderização WebGL
        Google Inc. -- ANGLE (Intel(R) G41 Express Chipset (Microsoft Corporation - WDDM 1.1)) -- OpenGL ES 2.0 (ANGLE 1.0.0.1041)

        Janelas aceleradas pela GPU
        0

Comment 3

[Loic]

Thanks for the log.

Could you try to use GDI Classic for font rendering in Firefox.
Go to about:config and change gfx.font_rendering.cleartype_params.rendering_mode to 2 and restart Firefox.

For the record:
A value of -1 implies use the default value, otherwise value ranges follow registry settings:
pref("gfx.font_rendering.cleartype_params.rendering_mode", -1);
rendering mode [0, 5] default: 0
0 = use default for font & size;
1 = aliased;
2 = GDI Classic;
3 = GDI Natural Widths;
4 = Natural;
5 = Natural Symmetric

Comment 4

[Leonardo Pereira]

it occurs less frenquently now, but still occurs.

Comment 5

[Leonardo Pereira]

I've recently installed the windows 8 in my notebook and the problem occurs in it too. I guess it can be a video driver issue since both my Desktop PC and Notebook have intel chipset and the driver I'm using in both is built-in microsoft WDDM1.1

Comment 6

[u279076]

Possibly related to or dupe of bug 793280.

Comment 7

[Leonardo Pereira]

Attachment: cleartype on/off

Comment 8

[juan becerra [:juanb]]

Leonardo, does this still happen on Firefox 16 beta 6?

Comment 9

[Leonardo Pereira]

(In reply to juan becerra [:juanb] from comment #8)
> Leonardo, does this still happen on Firefox 16 beta 6?

I'll try it and post a feedback

Comment 10

[Leonardo Pereira]

(In reply to juan becerra [:juanb] from comment #8)
> Leonardo, does this still happen on Firefox 16 beta 6?

No, it's solved in 16b6

Comment 11

[Tomer Cohen :tomer]

Attachment: Clear Type disabled