Closed
Bug 611563
Opened 15 years ago
Closed 15 years ago
Hang/freeze when trying to display certain Unicode private-area glyphs at large sizes (<h1> and <h2>, e.g.)
Categories
(Core :: Layout: Text and Fonts, defect)
Tracking
()
RESOLVED
FIXED
| Tracking | Status | |
|---|---|---|
| blocking2.0 | --- | final+ |
People
(Reporter: ejh985, Unassigned)
Details
Attachments
(2 files)
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:2.0b6) Gecko/20100101 Firefox/4.0b6
Build Identifier: Mozilla/5.0 (Windows NT 6.1; rv:2.0b6) Gecko/20100101 Firefox/4.0b6
Firefox is hanging indefinitely when trying to display a vanilla HTML page containing the following:
<font face="Linux Libertine O"><h1>  Longwood </h1></font>
(Note that you must have Linux Libertine installed for the crash/hang to occur; if a font is used that does not contain a glyph at that location, a "hex box" is displayed as expected.)
So far I've reproduced this on both Firefox 4b6 and Firefox 3.6.12, with any of the glyphs from U+E000 (A "Tux" glyph in Libertine) through roughly U+E121. In Libertine section constitutes about 80 or 90 special glyphs, including the true small caps, true old-style figures, the Wikipedia 'W', and more than a dozen latin ligatures.
The glyphs all render correctly at smallish sizes (including up through the default <h3>). I have not tested any other fonts for comparison, because I haven't found any others that use those code locations. Like I said above, the crash/hang does NOT occur for fonts without actual glyphs in that range, as the "hex box" seems to display fine.
The problem can also be caused by zooming in on a page that uses one or more of those glyphs at a *smaller* size. That is, such a page loads/displays correctly at first, but then Firefox hangs when you zoom in past a certain point.
Reproducible: Always
Steps to Reproduce:
1. Install "Linux Libertine O" (OpenType), freely available at sourceforge.
2. Create the world's lamest .html file:
<html>
<head><title>This page won't load!</title></head>
<body>
<font face="Linux Libertine O">
<h1> This should be a old-style '1':  </h1>
</body>
</html>
3. Open the file in Firefox.
Alternately:
1. Install Libertine.
2. Create the above file, but remove the <h1> and </h1> tags.
3. Open the file in Firefox.
4. Zoom in at least 4 or 5 times.
Actual Results:
Firefox hangs before anything is displayed. User is forced to terminate the program.
Expected Results:
Firefox should display a large line of text that reads "This should be a old-style '1': 1".
As I said in the Details, my ability to test the boundaries of this bug is limited by font catalog. It may be that the bug only affects the U+Exxx range of Unicode glyphs, or the entirety of the "Private Use" area; it might only affect Libertine's glyphs, or it might affect any glyphs of a certain size or complexity, or it might affect any glyph whatsoever at those positions.
I have at least confirmed that other browsers and text-processing software handle the glyphs correctly (e.g. IE8 and WordPad).
For those testers who might balk at having to actually install a font to test a bug: Libertine is an excellent and free font, anyway.
Here, for convenience, is a copy of the latest Libertine Regular font. If it is installed on your system, the test HTML file will cause Firefox to hang/freeze.
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Updated•15 years ago
|
Status: UNCONFIRMED → NEW
blocking2.0: --- → ?
Ever confirmed: true
Wow. That was fast. Don't know how, but this seems to be fixed already in 4b7. Guess it was a duplicate bug?
In any case, all the glyphs seem to be displayed properly at large sizes now.
Status: NEW → RESOLVED
Closed: 15 years ago
Resolution: --- → FIXED
blocking2.0: ? → final+
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Description
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