[Octave-bug-tracker] [bug #56506] [octave-forge] (geometry) clpPolygon_mrf crashes on non-overlapping polygons

[Philip Nienhuis]

URL:
  <https://savannah.gnu.org/bugs/?56506>

                 Summary: [octave-forge] (geometry) clpPolygon_mrf crashes on
non-overlapping polygons
                 Project: GNU Octave
            Submitted by: philipnienhuis
            Submitted on: Sun 16 Jun 2019 08:43:55 PM CEST
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: juanpi
         Originator Name: Philip Nienhuis
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
        Operating System: Any

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Details:

... when invoking the AND boolean operation:

>> subpol = [0 0; 5 5; 2.5 4;0 0];
>> clppol = [1 1; 6 6; 3.5 5; 1 1];
## First with these overlapping polygons ...
>> [outpol, f] = clipPolygon_mrf (subpol, clppol, 1)
outpol =
   3.0000   4.2000
   1.0000   1.0000
   5.0000   5.0000

f =  1
## Create disjoint clip polygon. With that ...
>> clppol2 = [10 1; 16 6; 13.5 5; 10 1];
>> [outpol, f] = clipPolygon_mrf (subpol, clppol2, 1)
error: out of memory or dimension too large for Octave's index type
error: called from
    clipPolygon_mrf at line 104 column 16
>>


I suspect something along the lines of compiled function polybool_mrf() not
checking for empty output polygons from the boolean operations before copying
internal results to output variables. The only boolean operation where empty
output can appear at all is AND.
(The Clipper library doesn't have this bug.)

cc-ing package maintainer.




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