Bug 49871 – [windows] font-size:0 text runs should have zero width

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[James Robinson]

The following should render with no gap between 'abc' and 'def':

abc<span style="font-size:0">w</span>def

but on the latest nightlies there's a large gap.  This causes us to misrender the php.net manual which uses this pattern (for whatever reason).  My guess it that we need to special-case platformWidthForGlyph(Glyph glyph) for the case when the font size is zero, but I don't currently have access to a windows development platform to verify.

[James Robinson]

Created attachment 74601 [details]
patch for chromium

[James Robinson]

Here's a patch for the chromium SimpleFont* classes that need them.  The OS X code seems to all work fine.

I'm pretty positive that the Safari Win port needs a similar patch, but I'm not sure exactly how to handle boundsForGDIGlyph() and don't have access to a dev environment to test code changes on Safari/Win so I've left that codepath alone.

[Dimitri Glazkov (Google)]

Comment on attachment 74601 [details]
patch for chromium

please don't break everything when landing this.

[James Robinson]

Committed r72567: <http://trac.webkit.org/changeset/72567>

[Adam Roben (:aroben)]

(In reply to comment #2)
> I'm pretty positive that the Safari Win port needs a similar patch, but I'm not sure exactly how to handle boundsForGDIGlyph()

I think you can handle it just like the other width functions.

[Mihai Parparita]

BTW, the updated test fails on the upstream Mac port on Leopard (presumably an ATSUI vs. CoreText difference):

-PASS s.getBoundingClientRect().width is 0
+FAIL s.getBoundingClientRect().width should be 0. Was 2147483648.

http://build.webkit.org/results/Leopard%20Intel%20Debug%20(Tests)/r72675%20(23809)/results.html

[Eric Seidel (no email)]

Seems this should be closed?

[Pravin D]

The same behavior is seen on Safari windows. Please reopen the bug. I'm uploading the patch for the same.