1573e1eed6
Summary: The ability to use pre-determined character widths will benefit alternative layout engines such as gagern's canvas layout engine. I would also like to experiment would using CSS transforms to absolutely position each glyph. This diff adds a new make rule, make extended_metrics, which generates metrics that also containing glyph widths. Test Plan: - run `make extended_metrics` - verify that fontMetricsData.js contains entries with 5 numbers instead of 4 Reviewers: emily alpert
109 lines
3.1 KiB
Python
Executable File
109 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python
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import collections
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import json
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import parse_tfm
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import subprocess
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import sys
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def find_font_path(font_name):
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try:
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font_path = subprocess.check_output(['kpsewhich', font_name])
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except OSError:
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raise RuntimeError("Couldn't find kpsewhich program, make sure you" +
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" have TeX installed")
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except subprocess.CalledProcessError:
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raise RuntimeError("Couldn't find font metrics: '%s'" % font_name)
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return font_path.strip()
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def main():
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mapping = json.load(sys.stdin)
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fonts = [
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'cmbsy10.tfm',
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'cmbx10.tfm',
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'cmex10.tfm',
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'cmmi10.tfm',
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'cmmib10.tfm',
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'cmr10.tfm',
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'cmsy10.tfm',
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'cmti10.tfm',
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'msam10.tfm',
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'msbm10.tfm',
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'eufm10.tfm',
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'cmtt10.tfm',
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'rsfs10.tfm',
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'cmss10.tfm',
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]
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# Extracted by running `\font\a=<font>` and then `\showthe\skewchar\a` in
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# TeX, where `<font>` is the name of the font listed here. The skewchar
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# will be printed out in the output. If it outputs `-1`, that means there
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# is no skewchar, so we use `None` here.
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font_skewchar = {
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'cmbsy10': None,
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'cmbx10': None,
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'cmex10': None,
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'cmmi10': 127,
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'cmmib10': None,
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'cmr10': None,
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'cmsy10': 48,
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'cmti10': None,
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'msam10': None,
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'msbm10': None,
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'eufm10': None,
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'cmtt10': None,
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'rsfs10': None,
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'cmss10': None,
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}
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font_name_to_tfm = {}
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for font_name in fonts:
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font_basename = font_name.split('.')[0]
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font_path = find_font_path(font_name)
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font_name_to_tfm[font_basename] = parse_tfm.read_tfm_file(font_path)
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families = collections.defaultdict(dict)
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for family, chars in mapping.iteritems():
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for char, char_data in chars.iteritems():
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char_num = int(char)
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font = char_data['font']
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tex_char_num = int(char_data['char'])
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yshift = float(char_data['yshift'])
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if family == "Script-Regular":
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tfm_char = font_name_to_tfm[font].get_char_metrics(tex_char_num,
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fix_rsfs=True)
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else:
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tfm_char = font_name_to_tfm[font].get_char_metrics(tex_char_num)
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height = round(tfm_char.height + yshift / 1000.0, 5)
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depth = round(tfm_char.depth - yshift / 1000.0, 5)
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italic = round(tfm_char.italic_correction, 5)
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width = round(tfm_char.width, 5)
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skewkern = 0.0
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if (font_skewchar[font] and
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font_skewchar[font] in tfm_char.kern_table):
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skewkern = round(
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tfm_char.kern_table[font_skewchar[font]], 5)
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families[family][char_num] = {
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'height': height,
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'depth': depth,
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'italic': italic,
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'skew': skewkern,
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'width': width
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}
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sys.stdout.write(
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json.dumps(families, separators=(',', ':'), sort_keys=True))
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if __name__ == '__main__':
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main()
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