247946 - "MathML in action" is misrenderred

Status: RESOLVED INVALID

(Core :: MathML, defect)

Description

[Rex Dieter]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040621
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040621

When trying to display the "MathML in action" page from 
http://www.mozilla.org/projects/mathml/start.xhtml
using mozilla-1.7, the page initially loads a blank page.  Using the scrollbars
makes part of the page display, but it is still distorted.  (I can provide
screenshots if necessary).

mozilla-1.6 worked fine.  Same thing happens on all my mozilla builds (on redhat
8.0/9, Fedora Core 1/2, and RH Enterprise 3).

Reproducible: Always
Steps to Reproduce:

Comment 1

[Rex Dieter]

FYI, changing my preferences to use Mathematica fonts instead of the default
(TeX?), makes the page at least render (instead of being blank), but elements
are misplaced.  Screenshot forthcoming

Comment 2

[Rex Dieter]

Attachment: mathml misrendering with Math'ca fonts

Comment 3

[rbs]

Any idea what has triggered this bug? 

The screenshot suggests that it is an Xft-build. Although the Xft-build wasn't
perfect before, it looks as if it has regressed. The screenshot shows characters
that are jamming now.

Comment 4

[Rex Dieter]

FYI, yes, this is with an Xft build (AFAIK, which is required for proper MathML
support/display).

Comment 5

[Jungshik Shin]

I can't reproduce the bug with the trunk build(gtk2 + xft) on Fedora Core 1.
I'll try 1.7 later.

Rex, what's the output of 'locale' command? How about your font setting in
Edit|Preference....? 

Comment 6

[Rex Dieter]

fonts: serif, sans-serif, monospace (fontconfig aliases for the bitstream-vera
fonts on Fedora Core)

$ locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

Comment 7

[Jungshik Shin]

I couldn't reproduce the bug with 1.7branch build (my own) on Fedora core1 under
en_US.UTF-8 locale. My font settting for Western is identical to yours. So are
aliases for sans,serif, monospace in fonts.config file. Because I have been
building with my patch for bug 215219, I suspected that *might* (although not so
likely) prevent this bug from showing up. I got rid of the patch and rebuilt it
(i.e I built with the same source as 1.7), but MathML is rendered in my 1.7
build as in 1.6.

I went through patches commited to nsFontMetricsXft.cpp since this February and
couldn't come up with an immediate culprit.  

Comment 8

[Rex Dieter]

FYI, here the configure flags I'm using to build mozilla (as I said, these same
options worked for moz-1.6):
  ./configure \
  --host=%{_host} --build=%{_build} --target=%{_target_platform} \
  --prefix=%{_prefix} --libdir=%{_libdir} --mandir=%{_mandir} \
  --enable-optimize \
  --disable-debug --disable-pedantic \
  --disable-tests --disable-short-wchar \
  --with-default-mozilla-five-home=%{_libdir}/mozilla-%{version} \
  %{!?debug_package:--enable-strip-libs} \
  --enable-nspr-autoconf \
  --enable-extensions \
  --enable-crypto \
  --enable-xprint \
  --without-system-nspr \
  --enable-svg --enable-svg-renderer-libart \
  --enable-calendar \
  --with-system-libjpeg \
  --with-system-libmng \
  --with-system-libpng \
  --with-system-zlib \
  --enable-default-toolkit=gtk2 \
  --enable-xft

Comment 9

[Rex Dieter]

I dropped a patch I borrowed from Mandrake, and now the misrendering is gone. 
 
I still have the issue that the page initially loads blank when using TeX 
fonts (until I use scrollbars to force sections of the page to refresh).  When 
using Mathematica fonts, the page now renders perfectly. 

Comment 10

[Jungshik Shin]

(In reply to comment #9)
> I dropped a patch I borrowed from Mandrake, and now the misrendering is gone. 

Gee, it would have saved me some time if you had written earlier that you had a
patch from Mandrake. Out of curiosity, what's their patch like? 
  
> I still have the issue that the page initially loads blank when using TeX 
> fonts (until I use scrollbars to force sections of the page to refresh).  When 
> using Mathematica fonts, the page now renders perfectly.
 
 I'll try to reproduce this problem later this week (I won't have any time to
look into this next two days)

Comment 11

[Rex Dieter]

My apologies about the bad Mandrake (ctl2) patch (and subsequent removal).  When
I was first investigating, I had done a quick scan of all my local patches to
see if any were relavent to MathML, and I missed that one.

For the record, my previous attempts at using MathML on non-xft builds ended up
crashing xfs (X font server).  freetype-enabled builds manually pointing at the
mathml fonts ended with mozilla crashes.  

Comment 12

[Rex Dieter]

I'm convinced now that I brought the bug/problem on myself by including
extraneous patches.  Move on, nothing more to see here.  (-: