[regression] Text rendering is incorrect

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Last reply by PiotrGrochowski

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PiotrGrochowski

13/9/19, முற்பகல் 2:02

Those three operations should make the text rendering correct:

Disable hardware acceleration Set gfx.canvas.azure.backends to direct2d1.1,cairo Set gfx.content.azure.backends to direct2d1.1,cairo

https://renderingenginetest.netlify.com/

Dark theme can be tested by reversing the foreground and background colors in the HTML.

For reference, here is the correct GDI rendering of this website:

https://i.imgur.com/dWuZfbD.png https://i.imgur.com/M4oKd7i.png

In Firefox ESR 52.4.1 (32-bit), text renders correctly:

https://i.imgur.com/InrXmeI.png https://i.imgur.com/kn3bZra.png

which is the same as the GDI rendering of this website, except for some line spacing issues.

However, in Firefox 70.0b6 (32-bit), the rendering regressed and text no longer renders correctly:

https://i.imgur.com/Jn2NxGJ.png https://i.imgur.com/qDxww7y.png

Line spacing is correct, but don't let this distract you from how profoundly unsmooth the rendering is in the light theme version. The dark theme version is nearly identical though.

Those three operations should make the text rendering correct: Disable hardware acceleration Set gfx.canvas.azure.backends to direct2d1.1,cairo Set gfx.content.azure.backends to direct2d1.1,cairo https://renderingenginetest.netlify.com/ Dark theme can be tested by reversing the foreground and background colors in the HTML. For reference, here is the correct GDI rendering of this website: https://i.imgur.com/dWuZfbD.png https://i.imgur.com/M4oKd7i.png In Firefox ESR 52.4.1 (32-bit), text renders correctly: https://i.imgur.com/InrXmeI.png https://i.imgur.com/kn3bZra.png which is the same as the GDI rendering of this website, except for some line spacing issues. However, in Firefox 70.0b6 (32-bit), the rendering regressed and text no longer renders correctly: https://i.imgur.com/Jn2NxGJ.png https://i.imgur.com/qDxww7y.png Line spacing is correct, but don't let this distract you from how profoundly unsmooth the rendering is in the light theme version. The dark theme version is nearly identical though.

Answer 1 · 2019-09-13 02:02:04

TyDraniu

Top 10 Contributor

13/9/19, முற்பகல் 3:53

PiotrGrochowski said

Those three operations should make the text rendering correct: Disable hardware acceleration Set gfx.canvas.azure.backends to direct2d1.1,cairo Set gfx.content.azure.backends to direct2d1.1,cairo

If you disabled HA, enumerating 'direct2d1.1' was redundant. You've been using cairo for text rendering.

Recently cairo code has been removed from the browser. See bug 1517077.

Answer 2 · 2019-09-13 02:02:04

PiotrGrochowski கேள்வியின் உரிமையாளர்

13/9/19, முற்பகல் 3:57

What a facepalm it is that high quality text rendering has been removed. It is a regression. It is a dealbreaker because many if not most webpages have text in them so I'm not using the recent version.

Answer 3 · 2019-09-13 02:02:04

McCoy

13/9/19, முற்பகல் 5:14

See this Reddit thread :

https://www.reddit.com/r/firefox/comments/cz6nys/firefox_69_breaks_windows_font_rendering/

Answer 4 · 2019-09-13 02:02:04

PiotrGrochowski கேள்வியின் உரிமையாளர்

13/9/19, பிற்பகல் 2:34

Has anyone tested whether this regression is crossplatform? (all platforms using Mozilla's open-source DirectWrite renderer as opposed to the system native text rendering engine)

PiotrGrochowski மூலமாக 13 செப்டம்பர், 2019, பிற்பகல் 9:46:41 -0700 திருத்தப்பட்டது