[libGD] #92 [Task opened] imagearc/imagefilledarc DoS fix problem

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A new Flyspray task has been opened.  Details are below.

User who did this - Claes Månsson (cj)

Attached to Project - libGD
Summary - imagearc/imagefilledarc DoS fix problem
Task Type - Bug Report
Category - Drawing function
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Normal
Reported Version - 2.0.34
Due in Version - Undecided
Due Date - Undecided
Details - The DoS fix for imagearc and imagefilledarc ( http://bugs.libgd.org/?do=details&task_id=74 ) may be too pedantic when cropping angles.

Consider a start angle of 270 and an end angle of 630. The intent is clearly to draw a full revolution of the arc from 12 to 12 o clock, but the modulo arithmetic converts the end angle to 270 which means that nothing is drawn.

This new behaviour broke a piechart script that we were using, so the issue is not merely theoretical.

A fix may go along the lines of this (untested code):
<code>
int diff;

diff = e - s;

if (diff > 360) {
  diff = diff % 360;
}


if (s > 360) {
  s = s % 360;
}

e = s + diff;
</code>








More information can be found at the following URL:
http://bugs.libgd.org/?do=details&task_id=92

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