This library provides functions which take in RoboFab objects (RFonts or their
children) and converts any cubic curves to quadratic. The most useful function
is probably fonts_to_quadratic:
from robofab.world import OpenFont
from cu2qu import fonts_to_quadratic
thin_font = OpenFont('MyFont-Thin.ufo')
bold_font = OpenFont('MyFont-Bold.ufo')
fonts_to_quadratic(thin_font, bold_font)Interpolation compatibility is guaranteed during conversion. If it's not needed, converting one font at a time may yield more optimized results:
for font in [thin_font, bold_font]:
fonts_to_quadratic(font)Some fonts may need a different error threshold than the default (5 units). This can also be provided by the caller:
fonts_to_quadratic(thin_font, bold_font, max_err=10)for font in [thin_font, bold_font]:
fonts_to_quadratic(font, max_err=2)fonts_to_quadratic returns a string reporting the number of curves of each
length. For example print fonts_to_quadratic(font) may print something like:
3: 1000
4: 2000
5: 100
meaning that the font now contains 1000 curves with three points, 2000 with four points, and 100 with five. Given multiple fonts, the function will report the total counts across all fonts.
See the source for functions which operate on glyphs, segments, or just several
points. FontCollection classes are also exposed, which allow access into
multiple fonts simultaneously and may be generally useful.