Details
-
Bug
-
Resolution: Duplicate
-
Not Evaluated
-
None
-
4.8.x
-
None
-
Qt 4.8.x (does not crash with 4.7.4)
Linux x64
Description
for the following example
#include <QApplication> #include <QString> #include <QFontMetrics> #include <QFont> #include <QDebug> int main(int argc, char** argv) { QApplication app(argc, argv); QChar normal_o(0x006F), crashChar(0x030C); QString crashString; crashString += normal_o; crashString += crashChar; QFont font; #if 0 font.setPointSize(9); font.setFamily("DejaVu Sans"); #endif QFontMetrics met(font); int width; width = met.width(crashString); qDebug() << "width is: " << width << " string:" << crashString; return 0; }
Qt-4.8.x crashes with
QFontEngineFT::loadFlags (this=<optimized out>, set=0x0, format=<optimized out>, flags=<optimized out>,
hsubpixel=@0x7fffffff965f, vfactor=@0x7fffffff9658) at text/qfontengine_ft.cpp:804
804 text/qfontengine_ft.cpp: Datei oder Verzeichnis nicht gefunden.
in text/qfontengine_ft.cpp
(gdb) bt
#0 QFontEngineFT::loadFlags (this=<optimized out>, set=0x0, format=<optimized out>,
flags=<optimized out>, hsubpixel=@0x7fffffff965f, vfactor=@0x7fffffff9658)
at text/qfontengine_ft.cpp:804
#1 0x00007ffff7061410 in QFontEngineFT::getPointInOutline (this=0x7bd670, glyph=701, flags=0, point=7,
xpos=0x7fffffff97f0, ypos=0x7fffffff97ec, nPoints=0x7fffffff96b8) at text/qfontengine_ft.cpp:1969
#2 0x00007ffff79cf22d in Get_Anchor (gpi=<optimized out>, an=0x819798, glyph_index=<optimized out>,
x_value=0x7fffffff97f0, y_value=0x7fffffff97ec) at ../3rdparty/harfbuzz/src/harfbuzz-gpos.c:759
#3 0x00007ffff79d19ec in Lookup_MarkBasePos (context_length=65535, flags=<optimized out>,
buffer=0x745e00, st=0x6d3690, gpi=0x7fffffff9870, nesting_level=<optimized out>)
at ../3rdparty/harfbuzz/src/harfbuzz-gpos.c:2302
#4 GPOS_Do_Glyph_Lookup (gpi=<optimized out>, lookup_index=<optimized out>, buffer=0x745e00,
context_length=65535, nesting_level=1) at ../3rdparty/harfbuzz/src/harfbuzz-gpos.c:5808
#5 0x00007ffff79d83f0 in GPOS_Do_String_Lookup (buffer=0x745e00, lookup_index=13, gpi=0x7fffffff9870)
at ../3rdparty/harfbuzz/src/harfbuzz-gpos.c:5902
#6 HB_GPOS_Apply_String (font=<optimized out>, gpos=0x70dcd0, load_flags=<optimized out>,
buffer=0x745e00, dvi=<optimized out>, r2l=<optimized out>)
at ../3rdparty/harfbuzz/src/harfbuzz-gpos.c:6073
#7 0x00007ffff79dd0a8 in HB_OpenTypePosition (item=0x7fffffffa070, availableGlyphs=2,
doLogClusters=1 '\001') at ../3rdparty/harfbuzz/src/harfbuzz-shaper.cpp:1232
#8 0x00007ffff79e1624 in HB_ShapeItem (shaper_item=0x7fffffffa070)
at ../3rdparty/harfbuzz/src/harfbuzz-shaper.cpp:1364
#9 0x00007ffff6fad5d2 in QTextEngine::shapeTextWithHarfbuzz (this=0x7fffffffa450, item=<optimized out>)
at text/qtextengine.cpp:1329
#10 0x00007ffff6fadfea in QTextEngine::shapeText (this=0x7fffffffa450, item=0) at text/qtextengine.cpp:922
#11 0x00007ffff6fae3c2 in QTextEngine::shape (this=0x7fffffffa450, item=0) at text/qtextengine.cpp:1437
#12 0x00007ffff6fb2ff1 in QTextEngine::width (this=0x7fffffffa450, from=0, len=<optimized out>)
at text/qtextengine.cpp:1670
#13 0x00007ffff6f8a8a9 in QFontMetrics::width (this=0x7fffffffd670, text=..., len=2,
flags=<optimized out>) at text/qfontmetrics.cpp:582
#14 0x0000000000402779 in main (argc=1, argv=0x7fffffffd7d8)
at /home/buscher/QT/qHarfbuzzCrash/main.cpp:27
it crashes in qfontengine_ft.cpp:804 because "set" is 0.
if you look at qfontengine_ft.cpp:801
http://qt.gitorious.org/qt/qt/blobs/4.8/src/gui/text/qfontengine_ft.cpp#line801
you can see that "set" can be 0.
crash introduced by
http://qt.gitorious.org/qt/qt/commit/5a4df38a
Patch attached to fix that crash.
Attachments
Issue Links
- is replaced by
-
-
- Closed
-