Bug 208084
| Summary: | Foobillard won't start | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Kjartan Maraas <kmaraas> |
| Component: | foobillard | Assignee: | Miloslav Trmač <mitr> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | rawhide | CC: | extras-qa, jantho, ondrej, trevin |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2006-12-05 09:03:51 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 208734 | ||
| Bug Blocks: | |||
|
Description
Kjartan Maraas
2006-09-26 10:44:05 UTC
I've tracked this bug down to freetype-2.2.1 in Fedora Core 6. The same version
of foobillard runs properly in Fedora Core 5 which has freetype-2.1.0.
The offending function is tt_cmap4_char_map_binary (in
freetype-2.2.1/src/sfnt/ttcmap.c). Here is the backtrace:
#0 tt_cmap4_char_map_binary (cmap=0x7409a0, pcharcode=0x7fff42accf14,
next=0 '\0') at /usr/src/debug/freetype-2.2.1/src/sfnt/ttcmap.c:1191
#1 0x00002aaaaab18b34 in tt_cmap4_char_index (cmap=0x4, char_code=104)
at /usr/src/debug/freetype-2.2.1/src/sfnt/ttcmap.c:1256
#2 0x000000000043efa7 in getStringGLListFT (str=0x798750 "hallo",
fontname=0x798850 "youregon.ttf", font_height=0.29999999999999999,
depth=0.0799999982, width=0x798958, height=<value optimized out>)
at font.c:584
#3 0x000000000043d752 in textObj3D_new (str=0x442df7 "hallo",
fontname=0x442bed "youregon.ttf", height=<value optimized out>,
depth=0.0799999982, ppspline=<value optimized out>) at textobj.c:192
#4 0x0000000000411060 in main (argc=1, argv=<value optimized out>)
at billard3d.c:5185
In frame 1 (tt_cmap4_char_index), there is a choice to call either
tt_cmap4_char_map_linear or tt_cmap4_char_map_binary depending on whether the
cmap is sorted. If I call (from the debugger) tt_cmap4_char_map_linear, I get
the correct index of 70. If I call tt_cmap4_char_map_binary using the same
parameters, I get an index of 57406, which is incorrect.
It appears that the problem starts around line 1100, when the OVERLAPPING flag
in the cmap is set. The variable p is changed to "cmap->data + 14 + ( i - 1 ) *
2" (equal to cmap->data + 14 + ( mid - 1 ) * 2). Since the character does not
occur in the previous segment, the loop breaks at line 1104. mid and max are
still equal, so the block at 1119 is skipped; and mid and 'i' are still equal as
well, so the block at 1171 is skipped, which would have reset p to cmap->data +
14 + mid * 2. I'm guessing that should have been the correct value of p.
It appears that this bug was fixed just yesterday:
http://cvs.savannah.gnu.org/viewcvs/freetype/freetype2/src/sfnt/ttcmap.c?r1=1.65&r2=1.66
I patched the file, rebuilt and installed freetype, and now foobillard runs.
Thanks for debugging this! Would it be possible to get this fix into FC6? Are we sure foobillard is the only app that breaks from this? Moving this to fedora core/freetype #208734, which blocks this bug, is already filed against freetype. Fixed in freetype-2.2.1-16.fc6. I've tested this yesterday on x86_64 and it works - thanks a lot. |