Re: [ft-devel] Can freetype be more tolerant with this font?

[Albert Astals Cid]

El dilluns, 31 de desembre de 2018, a les 14:44:10 CET, Alexei Podtelezhnikov 
va escriure:
> > I obviously have no idea how important the check for FT_CURVE_TAG_CUBIC is, 
> > just that for this particular font removing it makes it work.
> 
> Below is the dump of the m outline data. The contour 1 contains a run
> of four control points FT_CURVE_TAG_CUBIC (0x2), which is not how a
> Bezier curve would be specified. I think Freetype is correct to reject
> this font.

Ok, so the font is not correctly formed, but it seems that freetype can still 
render it "just fine".

Personally i think it would be much better if freetype would render the font 
(maybe even with a printf saying "broken font trying to continue") instead of 
"punishing" the person that received a PDF with that font in it by not 
rendering it.

There's that old saying that one should be strict when writing a format but 
flexible when reading the same format for maximum usability.

Cheers,
  Albert

> 
> LinuxBiolinumOItalic Regular loaded...
> Loading Flags: 0x1
> Outline Flags: 0x4
> Contour   0
>   1   x:   458   y:   180   t: 0x1
>   2   x:   465   y:   212   t: 0x2
>   3   x:   475   y:   249   t: 0x2
>   4   x:   482   y:   281   t: 0x1
>   5   x:   484   y:   293   t: 0x2
>   6   x:   485   y:   305   t: 0x2
>   7   x:   486   y:   316   t: 0x1
>   8   x:   540   y:   364   t: 0x2
>   9   x:   566   y:   379   t: 0x2
>  10   x:   603   y:   379   t: 0x1
>  11   x:   657   y:   379   t: 0x2
>  12   x:   672   y:   357   t: 0x2
>  13   x:   658   y:   290   t: 0x1
>  14   x:   635   y:   178   t: 0x1
>  15   x:   620   y:   104   t: 0x2
>  16   x:   608   y:    52   t: 0x2
>  17   x:   589   y:    -1   t: 0x1
>  18   x:   589   y:    -4   t: 0x1
>  19   x:   589   y:    -4   t: 0x2
>  20   x:   603   y:    -1   t: 0x2
>  21   x:   638   y:    -1   t: 0x1
>  22   x:   672   y:    -1   t: 0x2
>  23   x:   685   y:    -4   t: 0x2
>  24   x:   685   y:    -4   t: 0x1
>  25   x:   687   y:    -1   t: 0x1
>  26   x:   690   y:    56   t: 0x2
>  27   x:   698   y:   102   t: 0x2
>  28   x:   714   y:   178   t: 0x1
>  29   x:   735   y:   278   t: 0x1
>  30   x:   753   y:   367   t: 0x2
>  31   x:   757   y:   437   t: 0x2
>  32   x:   649   y:   437   t: 0x1
>  33   x:   596   y:   437   t: 0x2
>  34   x:   552   y:   419   t: 0x2
>  35   x:   484   y:   361   t: 0x1
>  36   x:   478   y:   411   t: 0x2
>  37   x:   447   y:   437   t: 0x2
>  38   x:   391   y:   437   t: 0x1
>  39   x:   357   y:   437   t: 0x2
>  40   x:   301   y:   422   t: 0x2
>  41   x:   228   y:   347   t: 0x1
>  42   x:   226   y:   350   t: 0x1
>  43   x:   230   y:   393   t: 0x2
>  44   x:   228   y:   425   t: 0x2
>  45   x:   228   y:   425   t: 0x1
>  46   x:   228   y:   435   t: 0x2
>  47   x:   226   y:   435   t: 0x2
>  48   x:   220   y:   435   t: 0x1
>  49   x:   196   y:   425   t: 0x2
>  50   x:   169   y:   417   t: 0x2
>  51   x:   139   y:   414   t: 0x1
>  52   x:   137   y:   411   t: 0x1
>  53   x:   144   y:   365   t: 0x2
>  54   x:   139   y:   308   t: 0x2
>  55   x:   123   y:   233   t: 0x1
>  56   x:   112   y:   178   t: 0x1
>  57   x:    96   y:   103   t: 0x2
>  58   x:    83   y:    52   t: 0x2
>  59   x:    64   y:    -2   t: 0x1
>  60   x:    65   y:    -5   t: 0x1
>  61   x:    65   y:    -5   t: 0x2
>  62   x:    83   y:    -2   t: 0x2
>  63   x:   114   y:    -2   t: 0x1
>  64   x:   145   y:    -2   t: 0x2
>  65   x:   161   y:    -5   t: 0x2
>  66   x:   161   y:    -5   t: 0x1
>  67   x:   164   y:    -2   t: 0x1
>  68   x:   168   y:    55   t: 0x2
>  69   x:   177   y:   102   t: 0x2
>  70   x:   193   y:   178   t: 0x1
>  71   x:   218   y:   295   t: 0x1
>  72   x:   277   y:   355   t: 0x2
>  73   x:   321   y:   377   t: 0x2
>  74   x:   353   y:   377   t: 0x1
>  75   x:   399   y:   377   t: 0x2
>  76   x:   413   y:   357   t: 0x2
>  77   x:   396   y:   276   t: 0x1
>  78   x:   375   y:   178   t: 0x1
>  79   x:   359   y:   103   t: 0x2
>  80   x:   348   y:    52   t: 0x2
>  81   x:   328   y:    -2   t: 0x1
>  82   x:   328   y:    -5   t: 0x1
>  83   x:   328   y:    -5   t: 0x2
>  84   x:   346   y:    -2   t: 0x2
>  85   x:   377   y:    -2   t: 0x1
>  86   x:   407   y:    -2   t: 0x2
>  87   x:   425   y:    -5   t: 0x2
>  88   x:   425   y:    -5   t: 0x1
>  89   x:   427   y:    -2   t: 0x1
>  90   x:   431   y:    55   t: 0x2
>  91   x:   440   y:   102   t: 0x2
> Contour   1
>  92   x:   456   y:   178   t: 0x1
>  93   x:   484   y:   358   t: 0x1
>  94   x:   484   y:   358   t: 0x2
>  95   x:   484   y:   358   t: 0x2
>  96   x:   484   y:   360   t: 0x2
>  97   x:   484   y:   360   t: 0x2
>