Font rendering antialiasing broken in tab labels

Bug #372670 reported by Ricardo Pérez López on 2009-05-06
This bug affects 1 person
Affects Status Importance Assigned to Milestone (Ubuntu)

Bug Description

Binary package hint:

Using the latest packages from Jaunty, the tab labels in the dialogs shows without antialiasing.

To reproduce the issue, click on Tools->Customize to display the Customize dialog. You can see that the "Menus", "Toolbars" and "Events" tabs shows without antialiasing. (The selected tab "Keyboard" is correctly displayed, though.)

I attach an screenshot to illustrate the problem.

Ricardo Pérez López (ricardo) wrote :
Ricardo Pérez López (ricardo) wrote :

Maybe related to #271283, and submitted at asac request.

Alexander Sack (asac) wrote :

hmm. does this happen for all tabs in OOO or just the ones in that dialog?

Ricardo Pérez López (ricardo) wrote :

Yes, the issue happens for all tabs in any application (I've tried Writer and Calc, at least). Any dialog containing tabs reproduces the issue. I can upload more screenshots if you need them.

Mike Kasick (mkasick) wrote :

I've looked into this issue as it was suggested to be possibly related to #271283, and I wanted to make sure that the fix I submitted didn't have additional side-effects.

I've looked at the posted screenshot, and to the best I can determine it appears that the tab glyphs _are_ antialiasted. If you zoom in, there's clearly whole-pixel blending happening on diagonals like "M" and "v". What's strange about this picture is that the vertical strokes are only one pixel wide with no edge blending. That alone isn't a problem--could easily happen on fully hinted fonts. It's bizarre though since the remaining glyphs in that dialog don't follow suit and do exhibit edge blending.

I can't tell exactly what's going on, but my best suspicion is that the inactive tabs are simply being displayed in a different font. Not sure why that's happening, could be a font misconfiguration issue as function of the font packages installed or a side effect of upgrading.

In any event, I booted the Jaunty Live CD with the stock configuration and took two screenshots, one as-is (lcddefault) and one with the patch from #271283 disabled (lcdlegacy). As best I can tell, everything appears appropriately in the stock configuration, with the inactive tabs rendering the same as other text, and the effects of applying the lcdfilter patch appear consistent with other applications.

Mike Kasick (mkasick) wrote :

Only one attachment per post?

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