diff options
Diffstat (limited to 'lib/extensions/lettering_svg_font_to_layers.py')
| -rw-r--r-- | lib/extensions/lettering_svg_font_to_layers.py | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/lib/extensions/lettering_svg_font_to_layers.py b/lib/extensions/lettering_svg_font_to_layers.py new file mode 100644 index 00000000..d5fc2219 --- /dev/null +++ b/lib/extensions/lettering_svg_font_to_layers.py @@ -0,0 +1,117 @@ +#!/usr/bin/env python3 +# coding=utf-8 +# +# Copyright (C) 2011 Felipe Correa da Silva Sanches <juca@members.fsf.org> +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +# +# +# Adapted for the inkstitch lettering module to allow glyph annotations for characters +# in specific positions or settings. Changes: see git history +"""Extension for converting svg fonts to layers""" + +from inkex import Layer, PathElement, errormsg + +from .base import InkstitchExtension + + +class LetteringSvgFontToLayers(InkstitchExtension): + """Convert an svg font to layers""" + + def add_arguments(self, pars): + pars.add_argument( + "--count", + type=int, + default=30, + help="Stop making layers after this number of glyphs.", + ) + + def flip_cordinate_system(self, elem, emsize, baseline): + """Scale and translate the element's path, returns the path object""" + path = elem.path + path.scale(1, -1, inplace=True) + path.translate(0, int(emsize) - int(baseline), inplace=True) + return path + + def effect(self): + # Current code only reads the first svgfont instance + font = self.svg.defs.findone("svg:font") + if font is None: + return errormsg("There are no svg fonts") + # setwidth = font.get("horiz-adv-x") + baseline = font.get("horiz-origin-y") + if baseline is None: + baseline = 0 + + guidebase = self.svg.viewbox_height - baseline + + fontface = font.findone("svg:font-face") + + emsize = fontface.get("units-per-em") + + # TODO: should we guarantee that <svg:font horiz-adv-x> equals <svg:font-face units-per-em> ? + caps = int(fontface.get("cap-height", 0)) + xheight = int(fontface.get("x-height", 0)) + ascender = int(fontface.get("ascent", 0)) + descender = int(fontface.get("descent", 0)) + + self.svg.set("width", emsize) + self.svg.namedview.add_guide(guidebase, True, "baseline") + self.svg.namedview.add_guide(guidebase - ascender, True, "ascender") + self.svg.namedview.add_guide(guidebase - caps, True, "caps") + self.svg.namedview.add_guide(guidebase - xheight, True, "xheight") + self.svg.namedview.add_guide(guidebase + descender, True, "decender") + + count = 0 + for glyph in font.findall("svg:glyph"): + hide_layer = count != 0 + self.convert_glyph_to_layer(glyph, emsize, baseline, hide_layer=hide_layer) + count += 1 + if count >= self.options.count: + break + + def convert_glyph_to_layer(self, glyph, emsize, baseline, hide_layer): + unicode_char = glyph.get("unicode") + + glyph_name = glyph.get("glyph-name").split('.') + if unicode_char is None: + if len(glyph_name) == 2: + unicode_char = glyph_name[0] + else: + return + + typographic_feature = '' + if len(glyph_name) == 2: + typographic_feature = glyph_name[1] + else: + arabic_form = glyph.get('arabic-form', None) + if arabic_form is not None and len(arabic_form) > 4: + typographic_feature = arabic_form[:4] + if typographic_feature: + typographic_feature = f".{typographic_feature}" + + layer = self.svg.add(Layer.new(f"GlyphLayer-{unicode_char}{typographic_feature}")) + + # glyph layers (except the first one) are innitially hidden + if hide_layer: + layer.style["display"] = "none" + + # Using curve description in d attribute of svg:glyph + path = layer.add(PathElement()) + path.path = self.flip_cordinate_system(glyph, emsize, baseline) + + +if __name__ == "__main__": + LetteringSvgFontToLayers().run() |