[PD-dev] libpd: divide by 0 in rtext_senditup()

[Dan Wilcox]

Thanks. Good catch! I’ll try it now.

--------
Dan Wilcox
@danomatika <https://twitter.com/danomatika>
danomatika.com <http://danomatika.com/>
robotcowboy.com <http://robotcowboy.com/>
> On Sep 24, 2016, at 11:34 AM, Pierre Guillot <guillotpierre6 at gmail.com> wrote:
> 
> Hi Dan, 
> I think I had the same issue with my plugin and PD 0.47. If I remember well, the solution was to call "sys_startgui(NULL)" after "pd_init()" (it should be in libpd_init() I think).
> 
> 2016-09-24 19:26 GMT+02:00 Dan Wilcox <danomatika at gmail.com <mailto:danomatika at gmail.com>>:
> Digging further, looks like sys_zoomfontwidth() & sys_zoomfontheight() are returning 0 in glist_fontwith()/glist_fontheight().
> 
> --------
> Dan Wilcox
> @danomatika <https://twitter.com/danomatika>
> danomatika.com <http://danomatika.com/>
> robotcowboy.com <http://robotcowboy.com/>
>> On Sep 24, 2016, at 11:20 AM, Dan Wilcox <danomatika at gmail.com <mailto:danomatika at gmail.com>> wrote:
>> 
>> I’m playing with removing the @synchronized locks in the libpd Obj-C layer since the updates to the libpd ringbuffer seem to be working now.
>> 
>> Long story short, I’m only running into one issue: divide by 0s in g_rtext.c rtext_senditup() when opening a file. It seems that the findx & findy computations on line 215 & 216 fails since the previous glist_fontwidth() & glist_fontheight() calls return 0. Could this be an execution order issue where removing the lock is making something happen earlier than it should?
>> 
>> Adding the following before the findx & findy math works as a quick fix to keep the divide by zero error:
>> 
>> if (fontwidth <= 0) fontwidth = 1;
>> if (fontheight <= 0) fontheight = 1;
>> 
>> I’m wondering if there is a better way to catch this...
>> 
>> --------
>> Dan Wilcox
>> @danomatika <https://twitter.com/danomatika>
>> danomatika.com <http://danomatika.com/>
>> robotcowboy.com <http://robotcowboy.com/>
> 
> 
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