svghmi/fonts.py
author Edouard Tisserant <edouard.tisserant@gmail.com>
Sat, 05 Mar 2022 11:14:00 +0100
branchwxPython4
changeset 3437 ce366d67a5b7
parent 3215 da2481f359b7
child 3933 6750083ae878
permissions -rw-r--r--
Tests: Enhance robustness of stdout driven waiting state in Sikuli based tests.

Some tests were randomly passing, because from time to time waiting for idle was skiped. It was combination of multiple problems :
- buffering on stdout (now use readline + flush for each write to log)
- it is sometime required to wait for activity before waiting for timeout added "WaitForChangeAndIdle" to "stdoutIdleObserver"
#!/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
import sys
from base64 import b64encode

from fontTools import ttLib

# Inkscape seems to refer to font with different family name depending on platform.
# this are heuristics that would need extensive testing to be sure.
FamilyNameIDs = [1] if sys.platform.startswith('win') else [1, 16]

def GetFontTypeAndFamilyName(filename):
    """
    Getting font family, format and MIME type
    """

    familyname = None
    uniquename = 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:
        #print(name.nameID, name.platformID, name.langID, name.toUnicode())
        if name.nameID in FamilyNameIDs and name.platformID==3 and name.langID==1033:
            familyname = name.toUnicode()
        if name.nameID==4 and name.platformID==3 and name.langID==1033:
            uniquename = 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,uniquename,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, uniquename, 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"))