Created attachment 653557 [details]
example of bad hinting
Upgraded to F18 beta today, and all of a sudden everything looks like shit in Firefox. After some investigation, it turns out that hinting for Liberation Sans seems to be utterly broken.
See comparison screen shot from Firefox on F17 and F18.
Also tried forcing Liberation Sans in Epiphany, which rendered the same (i.e. badly).
Thanks for reporting this issue. We are going to discuss in tomorrow i18n meeting whether to revert back liberation 2.0 fonts. Will update it here.
Some issues noticesed:
* In the right picture some single vertical lines take several pixels while similar lines in other letters (or other parts of the same letter like in Russian ш in the word шрифтов or the П letter) occupy 1 pixel. It is incorrect that one vertical line in П is thicker than the other.
This unevenness creates an effect of blots spread through the text.
* Due to subpixel smoothing this also creates an "rainbow" effect with colorful (reddish) play while the text in the text in the left window looks evenly black (in the both examples the subpixel smoothing is on).
* Some thick letters in the right window fuse such as letters "ым" in the word "лицензированными".
* The broken hinting also makes the lower part of the "в" letter to appear smaller than the upper part (look at the word "шрифтов"). This is incorrect behavior.
*** This bug has been marked as a duplicate of bug 856239 ***