kopia lustrzana https://github.com/inkstitch/inkstitch
70 wiersze
2.9 KiB
Python
70 wiersze
2.9 KiB
Python
from inkex import NSS
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from lxml import etree
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class FontKerning(object):
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"""
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This class reads kerning information from an SVG file
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"""
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def __init__(self, path):
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with open(path) as svg:
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self.svg = etree.parse(svg)
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# horiz_adv_x defines the wdith of specific letters (distance to next letter)
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def horiz_adv_x(self):
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# In XPath 2.0 we could use ".//svg:glyph/(@unicode|@horiz-adv-x)"
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xpath = ".//svg:glyph[@unicode and @horiz-adv-x]/@*[name()='unicode' or name()='horiz-adv-x']"
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hax = self.svg.xpath(xpath, namespaces=NSS)
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if len(hax) == 0:
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return {}
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return dict(zip(hax[0::2], [int(x) for x in hax[1::2]]))
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# kerning (specific distances of two specified letters)
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def hkern(self):
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xpath = ".//svg:hkern[(@u1 or @g1) and (@u1 or @g1) and @k]/@*[contains(name(), '1') or contains(name(), '2') or name()='k']"
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hkern = self.svg.xpath(xpath, namespaces=NSS)
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for index, glyph in enumerate(hkern):
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# fontTools.agl will import fontTools.misc.py23 which will output a deprecation warning
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# ignore the warning for now - until the library fixed it
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if index == 0:
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import warnings
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with warnings.catch_warnings():
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warnings.simplefilter("ignore")
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from fontTools.agl import toUnicode
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if len(glyph) > 1 and not (index + 1) % 3 == 0:
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glyph_names = glyph.split(",")
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# the glyph name is written in various languages, second is english. Let's look it up.
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if len(glyph_names) == 1:
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hkern[index] = toUnicode(glyph)
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else:
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hkern[index] = toUnicode(glyph_names[1])
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k = [int(x) for x in hkern[2::3]]
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u = [k + v for k, v in zip(hkern[0::3], hkern[1::3])]
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hkern = dict(zip(u, k))
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return hkern
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# the space character
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def word_spacing(self):
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xpath = "string(.//svg:glyph[@glyph-name='space'][1]/@*[name()='horiz-adv-x'])"
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word_spacing = self.svg.xpath(xpath, namespaces=NSS) or 26
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return int(word_spacing)
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# default letter spacing
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def letter_spacing(self):
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xpath = "string(.//svg:font[@horiz-adv-x][1]/@*[name()='horiz-adv-x'])"
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letter_spacing = self.svg.xpath(xpath, namespaces=NSS) or 0
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return int(letter_spacing)
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# this value will be saved into the json file to preserve it for later font edits
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# additionally it serves to automatically define the line height (leading)
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def units_per_em(self, default=100):
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xpath = "string(.//svg:font-face[@units-per-em][1]/@*[name()='units-per-em'])"
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units_per_em = self.svg.xpath(xpath, namespaces=NSS) or default
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return int(units_per_em)
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"""
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def missing_glyph_spacing(self):
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xpath = "string(.//svg:missing-glyph/@*[name()='horiz-adv-x'])"
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return float(self.svg.xpath(xpath, namespaces=NSS))
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"""
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