svghmi/fonts.py
author Edouard Tisserant
Thu, 16 Sep 2021 09:40:36 +0200
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Sequel to 95fe62bfe920 : Copy description when DnD variables from Globals in resources and configuration variable panels to POUs, now including ST/IL POUs.
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz
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# Copyright (C) 2021: Edouard TISSERANT
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#
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# See COPYING file for copyrights details.
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from __future__ import print_function
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import sys
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from base64 import b64encode
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from fontTools import ttLib
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# Inkscape seems to refer to font with different family name depending on platform.
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# this are heuristics that would need extensive testing to be sure.
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FamilyNameIDs = [1] if sys.platform.startswith('win') else [1, 16]
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def GetFontTypeAndFamilyName(filename):
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    """
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    Getting font family, format and MIME type
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    """
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    familyname = None
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    uniquename = None
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    formatname = None
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    mimetype = None
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    font = ttLib.TTFont(filename)
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    # https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html
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    for name in font["name"].names:
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        #print(name.nameID, name.platformID, name.langID, name.toUnicode())
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        if name.nameID in FamilyNameIDs and name.platformID==3 and name.langID==1033:
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            familyname = name.toUnicode()
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        if name.nameID==4 and name.platformID==3 and name.langID==1033:
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            uniquename = name.toUnicode()
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    if font.flavor :
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        # woff and woff2
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        formatname = font.flavor
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        mimetype = "font/" + formatname
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    # conditions on sfntVersion was deduced from fontTools.ttLib.sfnt
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    elif font.sfntVersion in ("\x00\x01\x00\x00", "true"):
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        formatname = "truetype"
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        mimetype = "font/ttf"
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    elif font.sfntVersion == "OTTO":
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        formatname = "opentype"
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        mimetype = "font/otf"
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    return familyname,uniquename,formatname,mimetype
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def DataURIFromFile(filename, mimetype):
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    with open(filename, "rb") as fp:
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        data = fp.read()
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    return "".join([
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        "data:",
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        mimetype,
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        ";base64,",
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        b64encode(data).strip()])
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def GetCSSFontFaceFromFontFile(filename):
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    familyname, uniquename, formatname, mimetype = GetFontTypeAndFamilyName(filename)
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    data_uri = DataURIFromFile(filename, mimetype)
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    css_font_face = \
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    """
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    @font-face {{
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          font-family: "{}";
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          src: url("{}") format("{}")
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    }}
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    """.format(familyname, data_uri, formatname)
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    return css_font_face
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# tests
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if __name__ == '__main__':
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    print(GetCSSFontFaceFromFontFile("/usr/share/matplotlib/mpl-data/fonts/ttf/DejaVuSans.ttf"))
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    print(GetCSSFontFaceFromFontFile("/usr/share/fonts/opentype/urw-base35/NimbusSans-Regular.otf"))
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    print(GetCSSFontFaceFromFontFile("/usr/share/yelp/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_SansSerif-Regular.woff"))