Re: [Fontforge-devel] Conversion to quadratic splines

[Alexej K. <ana...@ya...>]

On Tuesday 28 February 2006 19:12, George Williams wrote:
> On Sat, 2006-02-25 at 11:51, Alexey Kryukov wrote:
> > Good news! Unfortunately, I can't test this, because the current
> > CVS hangs when I am trying to convert splines to quadratic or to
> > perform a TTF export.
>
> I can't reproduce this. Can you send an example where it hangs? I
> have seen occasional Internal Errors, but I think they are now fixed
> in the cvs tree. Never a hang.

Surprizingly, on my system FF hangs on absolutely any font, including 
one sent by Michal (problems4.sfd). Here the callstack:

0x081634de in _QuarticSolve (q=0xbf929be8, ts=0xbf929d10) at 
splineutil.c:3111
3111                if ( val>-.0001 && val<.0001 ) {
(gdb) info threads
  1 Thread -1208957248 (LWP 20577)  0x081634de in _QuarticSolve 
(q=0xbf929be8, ts=0xbf929d10)
    at splineutil.c:3111
(gdb) where
#0  0x081634de in _QuarticSolve (q=0xbf929be8, ts=0xbf929d10) at 
splineutil.c:3111
#1  0x0816666f in LineTangentToSplineThroughPt (s=0x8cb67f8, 
pt=0xbf929dd8, ts=0xbf929d10,
    tmin=0.76009139656222424, tmax=1.5) at splineutil.c:3894
#2  0x0820e764 in PrettyApprox (ps=0x8cb67f8, tmin=0.5, tmax=1, 
data=0xbf929da0, qcnt=2)
    at splineorder2.c:563
#3  0x0820f664 in ttfApprox (ps=0x8cb67f8, start=Variable "start" is not 
available.
) at splineorder2.c:692
#4  0x0820fa59 in SSttfApprox (ss=0x8c1ade8) at splineorder2.c:754
#5  0x0820fc8d in SplineSetsTTFApprox (ss=0x8c1ade8) at 
splineorder2.c:780
#6  0x0820fcd3 in SCConvertToOrder2 (sc=0x8cb1728) at splineorder2.c:867
#7  0x0820fdce in SFConvertToOrder2 (_sf=Variable "_sf" is not 
available.
) at splineorder2.c:905
#8  0x080c558d in GFI_OK (g=0x8cd0160, e=0xbf92a7e4) at fontinfo.c:5481
#9  0x003a8cd5 in GButtonInvoked (b=Variable "b" is not available.
) at gbuttons.c:59
#10 0x003aa0d7 in gbutton_mouse (g=0x8cd0160, event=0xbf92aa70) at 
gbuttons.c:193
#11 0x003ac917 in _GWidget_Container_eh (gw=0x8c7d930, event=0xbf92aa70) 
at gcontainer.c:286
#12 0x003ad38b in _GWidget_TopLevel_eh (gw=0x8c7d930, event=0xbf92aa70) 
at gcontainer.c:717
#13 0x003f6ca4 in dispatchEvent (gdisp=0x8b86268, event=0xbf92aaec) at 
gxdraw.c:3128
#14 0x003f838b in GXDrawEventLoop (gd=0x8b86268) at gxdraw.c:3227
#15 0x003af7f0 in GDrawEventLoop (gdisp=0x0) at gdraw.c:626
#16 0x08176a46 in FontForgeMain (argc=2, argv=0xbf92b1f4) at start.c:786
#17 0x00c23de6 in __libc_start_main () from /lib/libc.so.6
#18 0x0805d6a9 in _start ()   

-- 
Regards,
Alexey Kryukov <anagnost {at} yandex {dot} ru>

Moscow State University
Historical Faculty