Fix #55005: imagepolygon num_points requirement

We actually have to check `$num_points` instead of `2*count($points)`,
because the latter may be greater than the former, but not all elements
of `$points` are guaranteed to be used.  This allowed to pass arrays
with excess elements to draw polygons with less than three vertices.

While the current implementation of `gdImagePolygon()` and friends
would allow us to draw monogons and digons, we don't allow that
anymore, because the respective drawing primitives work slightly
different (e.g. drawing lines support anti-aliasing, but drawing
general polygons does not).

To minimize the BC break, we do not fix this longstanding issue for PHP
7, but target PHP 8 only.

0 files changed, 0 insertions, 0 deletions