[cairo-bugs] [Bug 39096] New: _cairo_fixed_from_double overflow with double > about 8 400 000

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat Jul 9 09:17:07 PDT 2011


           Summary: _cairo_fixed_from_double overflow with double > about
                    8 400 000
           Product: cairo
           Version: 1.10.3
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: arno at renevier.net
         QAContact: cairo-bugs at cairographics.org

when using cairo with big double numbers (ie about 8 400 000), an overflow
appears in _cairo_fixed_from_double and input is transformed to a negative
value. In attached testcase, output should be:
path: 8400000.000000 0.000000 8400000.000000 200.000000
but is actually:
path: -8377216.000000 0.000000 -8377216.000000 200.000000

bug does not appear with 8300000 and below.

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