Bug 47744

Summary: Absolute Signs (vertical bar) and Integral doesn't stack properly for stretched operators
Product: WebKit Reporter: Alex Milowski <alex>
Component: MathMLAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: cdumez, dbarton, d-r, fred.wang, mrobinson, myschizobuddy
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: PC   
OS: Linux   
Bug Depends on: 121416    
Bug Blocks:    
Attachments:
Description Flags
Visual proof
none
reftest
none
reftest (reference) none

Alex Milowski
Reported 2010-10-15 15:23:24 PDT
After the STIX fonts have been installed, the vertical bar/absolute sign doesn't stack properly. There are spaced between each stacked glyph. This was tested on Ubuntu 10.10 using the Gtk port.
Attachments
Visual proof (36.61 KB, image/png)
2012-05-02 06:45 PDT, Chris Dumez 		no flags
Details
reftest (1.79 KB, text/html)
2013-07-19 01:54 PDT, Frédéric Wang (:fredw) 		no flags
Details
reftest (reference) (844 bytes, text/html)
2013-07-19 01:55 PDT, Frédéric Wang (:fredw) 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alex Milowski
Comment 1 2010-10-18 18:24:58 PDT
The integral sign also doesn't stack properly.
MySchizo Buddy
Comment 2 2010-12-29 12:55:40 PST
you should post the faulty mathml code and associated screenshots if you want any chance of this getting fixed.
Chris Dumez
Comment 3 2012-05-02 06:45:42 PDT
Created attachment 139801 [details] Visual proof I can reproduce the issue in EFL port (I'm assuming you would get similar results with GTK since we share fonts), see screenshot attached. It is easily reproduced with the following tests: - mathml/presentation/mo.xhtml - mathml/presentation/row.xhtml
Chris Dumez
Comment 4 2012-05-02 06:47:39 PDT
This may be a STIX font problem? There was actually a similar bug report filed against STIX 1.0 (for integral sign only): http://sourceforge.net/tracker/?func=detail&aid=3136520&group_id=328428&atid=1378225
Frédéric Wang (:fredw)
Comment 5 2013-07-19 01:52:22 PDT
(In reply to comment #3) > Created an attachment (id=139801) [details] > Visual proof > > I can reproduce the issue in EFL port (I'm assuming you would get similar results with GTK since we share fonts), see screenshot attached. > > It is easily reproduced with the following tests: > - mathml/presentation/mo.xhtml > - mathml/presentation/row.xhtml The gaps are also visible on the GTK ports too, except that the references are currently PNG images of the the bad output and so the tests pass (the EFL versions are skipped). I'm going to attach a reftest to verify that the extenders form perfect straight lines. (In reply to comment #4) > This may be a STIX font problem? > > There was actually a similar bug report filed against STIX 1.0 (for integral sign only): > http://sourceforge.net/tracker/?func=detail&aid=3136520&group_id=328428&atid=1378225 I think it's just the way WebKit positions the glyphs that should be improved. Martin Robinson is working on a patch that fixes this problem on GTK and I guess EFL too, but it's not ready yet.
Frédéric Wang (:fredw)
Comment 6 2013-07-19 01:54:42 PDT
Created attachment 207069 [details] reftest
Frédéric Wang (:fredw)
Comment 7 2013-07-19 01:55:10 PDT
Created attachment 207070 [details] reftest (reference)
Frédéric Wang (:fredw)
Comment 8 2013-07-19 01:57:19 PDT
Attachment 207069 [details] and attachment 207070 [details] should render the same when this bug is fixed and should render differently on the GTK/EFL ports and probably others at the moment.
Frédéric Wang (:fredw)
Comment 9 2013-07-24 01:46:20 PDT
Note on the reftests: I really wanted to use narrower red bands (50px instead of 150px) but could not because of bug 119043.
Martin Robinson
Comment 10 2013-10-08 16:08:59 PDT
*** This bug has been marked as a duplicate of bug 122361 ***
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