tfmLib: Read TeX Font Metrics files
Module for reading TFM (TeX Font Metrics) files.
The TFM format is described in the TFtoPL WEB source code, whose typeset form can be found on CTAN.
>>> from fontTools.tfmLib import TFM
>>> tfm = TFM("Tests/tfmLib/data/cmr10.tfm")
>>>
>>> # Accessing an attribute gets you metadata.
>>> tfm.checksum
1274110073
>>> tfm.designsize
10.0
>>> tfm.codingscheme
'TeX text'
>>> tfm.family
'CMR'
>>> tfm.seven_bit_safe_flag
False
>>> tfm.face
234
>>> tfm.extraheader
{}
>>> tfm.fontdimens
{'SLANT': 0.0, 'SPACE': 0.33333396911621094, 'STRETCH': 0.16666698455810547, 'SHRINK': 0.11111164093017578, 'XHEIGHT': 0.4305553436279297, 'QUAD': 1.0000028610229492, 'EXTRASPACE': 0.11111164093017578}
>>> # Accessing a character gets you its metrics.
>>> # “width” is always available, other metrics are available only when
>>> # applicable. All values are relative to “designsize”.
>>> tfm.chars[ord("g")]
{'width': 0.5000019073486328, 'height': 0.4305553436279297, 'depth': 0.1944446563720703, 'italic': 0.013888359069824219}
>>> # Kerning and ligature can be accessed as well.
>>> tfm.kerning[ord("c")]
{104: -0.02777862548828125, 107: -0.02777862548828125}
>>> tfm.ligatures[ord("f")]
{105: ('LIG', 12), 102: ('LIG', 11), 108: ('LIG', 13)}