/usr/lib/python2.7/dist-packages/reportlab/pdfbase/_can_cmap_data.py is in python-reportlab 3.3.0-1.
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"""
This is a utility to 'can' the widths data for certain CID fonts.
Now we're using Unicode, we don't need 20 CMAP files for each Asian
language, nor the widths of the non-normal characters encoded in each
font. we just want a dictionary of the character widths in a given
font which are NOT 1000 ems wide, keyed on Unicode character (not CID).
Running off CMAP files we get the following widths...::
>>> font = UnicodeCIDFont('HeiseiMin-W3')
>>> font.stringWidth(unicode(','), 10)
2.5
>>> font.stringWidth(unicode('m'), 10)
7.7800000000000002
>>> font.stringWidth(u'\u6771\u4EAC', 10)
20.0
>>>
"""
from pprint import pprint as pp
from reportlab.pdfbase._cidfontdata import defaultUnicodeEncodings
from reportlab.pdfbase.cidfonts import UnicodeCIDFont
def run():
buf = []
buf.append('widthsByUnichar = {}')
for fontName, (language, encName) in defaultUnicodeEncodings.items():
print('handling %s : %s : %s' % (fontName, language, encName))
#this does just about all of it for us, as all the info
#we need is present.
font = UnicodeCIDFont(fontName)
widthsByCID = font.face._explicitWidths
cmap = font.encoding._cmap
nonStandardWidthsByUnichar = {}
for codePoint, cid in cmap.items():
width = widthsByCID.get(cid, 1000)
if width != 1000:
nonStandardWidthsByUnichar[chr(codePoint)] = width
print('created font width map (%d items). ' % len(nonStandardWidthsByUnichar))
buf.append('widthsByUnichar["%s"] = %s' % (fontName, repr(nonStandardWidthsByUnichar)))
src = '\n'.join(buf) + '\n'
open('canned_widths.py','w').write(src)
print('wrote canned_widths.py')
if __name__=='__main__':
run()
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