Created attachment 1165931 [details] antialiasing rendering difference between ff46 and ff47 Hi! it appears to me that font antialiasing changed in a subtle but noticeable manner between firefox 46 and firefox 47. It concerns rgb antialiasing. This is particularily visible on the rendering of the "w" letter in the attached screenshot : firefox 46 on the left xmag, and firefox 47 on the right. Firefox 46 rendering was smoother (more blue levels on the left w).
It's particularly noticeable if font hinting is turned off entirely. Then font rendering can be quite different between 46 (e.g. firefox-46.0.1-9.fc23, which I just tested with) and 47 (firefox-47.0-4.fc23). For example, the address bar's rendering is horrendous. I'm attaching two comparative examples of my own. Beyond the address bar, note for instance the artifacts on the brackets of "(rhbz#1338010)" on the right side of the page.
Created attachment 1166112 [details] Font rendering in Firefox 46
Created attachment 1166113 [details] Font rendering in Firefox 47
Looks like this is caused by xrender being now disabled by default. You can get the old behavior by setting "gfx.xrender.enabled" to "true" in about:config. Mozilla bug for the change: https://bugzilla.mozilla.org/show_bug.cgi?id=1241832
Mozilla bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1279785 With some Fontconfig tuning, the about:config change is not needed.
Nice catch! it works after doing the suggested tweak in fontconfig, about lcdfilter: ln -s /usr/share/fontconfig/conf.avail/11-lcdfilter-default.conf ~/.config/fontconfig/conf.d Thanks,
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