beremiz

SVGHMI: Added fonts.py with functions to convert ttf, otf and woff fonts into data_uri based CSS font-face
svghmi
2021-03-29, Edouard Tisserant
debd5014ce21
Parents 5d379934d5c9
Children de6b878c324d
SVGHMI: Added fonts.py with functions to convert ttf, otf and woff fonts into data_uri based CSS font-face
1 files changed, 69 insertions(+), 0 deletions(-)
  • +69 -0
    svghmi/fonts.py
    • --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/svghmi/fonts.py Mon Mar 29 07:11:45 2021 +0200
    @@ -0,0 +1,69 @@
    +#!/usr/bin/env python
    +# -*- coding: utf-8 -*-
    +
    +# This file is part of Beremiz
    +# Copyright (C) 2021: Edouard TISSERANT
    +#
    +# See COPYING file for copyrights details.
    +
    +from __future__ import print_function
    +from base64 import b64encode
    +
    +from fontTools import ttLib
    +
    +def GetFontTypeAndFamilyName(filename):
    + """
    + Getting font family, format and MIME type
    + """
    +
    + familyname = None
    + formatname = None
    + mimetype = None
    +
    + font = ttLib.TTFont(filename)
    + # https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html
    + for name in font["name"].names:
    + if name.nameID==1 and name.platformID in [0,3]:
    + familyname = name.toUnicode()
    +
    + if font.flavor :
    + # woff and woff2
    + formatname = font.flavor
    + mimetype = "font/" + formatname
    + # conditions on sfntVersion was deduced from fontTools.ttLib.sfnt
    + elif font.sfntVersion in ("\x00\x01\x00\x00", "true"):
    + formatname = "truetype"
    + mimetype = "font/ttf"
    + elif font.sfntVersion == "OTTO":
    + formatname = "opentype"
    + mimetype = "font/otf"
    +
    + return familyname,formatname,mimetype
    +
    +def DataURIFromFile(filename, mimetype):
    + with open(filename, "rb") as fp:
    + data = fp.read()
    + return "".join([
    + "data:",
    + mimetype,
    + ";base64,",
    + b64encode(data).strip()])
    +
    +def GetCSSFontFaceFromFontFile(filename):
    + familyname, formatname, mimetype = GetFontTypeAndFamilyName(filename)
    + data_uri = DataURIFromFile(filename, mimetype)
    + css_font_face = \
    + """
    + @font-face {{
    + font-family: "{}";
    + src: url("{}") format("{}")
    + }}
    + """.format(familyname, data_uri, formatname)
    + return css_font_face
    +
    +
    +# tests
    +if __name__ == '__main__':
    + print(GetCSSFontFaceFromFontFile("/usr/share/matplotlib/mpl-data/fonts/ttf/DejaVuSans.ttf"))
    + print(GetCSSFontFaceFromFontFile("/usr/share/fonts/opentype/urw-base35/NimbusSans-Regular.otf"))
    + print(GetCSSFontFaceFromFontFile("/usr/share/yelp/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_SansSerif-Regular.woff"))