Variable Font Validation

Comments

• Options

  John Hudson Posts: 2,977

  December 2019

  Flipped and scaled composites were supposed to be technically okay in TrueType since the beginning, but in fact they tended to cause rendering problems, so I long ago made a point of only using composites unflipped and unscaled.
  

  6
• Options

  Adam Jagosz Posts: 689

  December 2019 edited December 2019

  I wanted to ask the same question. So I assume it is safer to care about winding directions? Is there a reasonable way to test for them in FontLab 7? (FontAudit doesn't include it, since it's supposed to be fixed upon export, but variable fonts seemingly can't be manipulated with predictable results this way). I tried scripting, but the function I tried to use doesn't work:

  <div>from FL import *;<br>f = fl.font;<br>for g in f.glyphs:<br>&nbsp; n = g.GetContoursNumber();<br>&nbsp; for i in range(0,n):<br>&nbsp;&nbsp;&nbsp; cc = g.isContourClockwise(i);<br>&nbsp;&nbsp;&nbsp; print g.name;<br>&nbsp;&nbsp;&nbsp; print cc; # returns None for all glyphs, instead of a boolean<br>&nbsp;&nbsp;&nbsp; if cc:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; print g.name + "has counter-clockwise contour " + str(i);<br></div>

  0
• Options

  Jeremy Dooley Posts: 67

  December 2019

  Some context: https://forum.fontlab.com/fontlab-7/correct-winding-directions-in-fl7-variable-font/

  0
• Options

  Viktor Rubenko Posts: 119

  December 2019

  @Adam Jagosz
  

  import fontlab as fl
  
  
  for glyph in (fl.flGlyph(glyph) for glyph in fl.CurrentFont().glyphs):
      if glyph.activeLayer.getContours():
          print(
              "{}: {}".format(
                  glyph.name,
                  [
                      contour.clockwise
                      for contour in glyph.activeLayer.getContours()
                  ],
              )
          )
  

  
  

  
  

  2
• Options

  Dave Crossland Posts: 1,391

  December 2019 edited December 2019

  Contributors to the FontBakery project are developing a set of checks for variable fonts. You are welcome to contribute ideas or code!
  
  GitHub.com/googlefonts/FontBakery

  0