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#!/usr/bin/python
'IPython support for fonttools'
__all__ = ['displayGlyphs', 'loadFont', 'displayText', 'displayRaw']
from fontTools import ttLib
from fontTools.pens.basePen import BasePen
from fontTools.misc import arrayTools
from IPython.display import SVG, HTML
from defcon import Font
from ufo2ft import compileTTF
class SVGPen(BasePen) :
def __init__(self, glyphSet, scale=1.0) :
super(SVGPen, self).__init__(glyphSet);
self.__commands = []
self.__scale = scale
def __str__(self) :
return " ".join(self.__commands)
def scale(self, pt) :
return ((pt[0] or 0) * self.__scale, (pt[1] or 0) * self.__scale)
def _moveTo(self, pt):
self.__commands.append("M {0[0]} {0[1]}".format(self.scale(pt)))
def _lineTo(self, pt):
self.__commands.append("L {0[0]} {0[1]}".format(self.scale(pt)))
def _curveToOne(self, pt1, pt2, pt3) :
self.__commands.append("C {0[0]} {0[1]} {1[0]} {1[1]} {2[0]} {2[1]}".format(self.scale(pt1), self.scale(pt2), self.scale(pt3)))
def _closePath(self) :
self.__commands.append("Z")
def clear(self) :
self.__commands = []
def _svgheader():
return '''<?xml version="1.0"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
'''
def _bbox(f, gnames, points, scale=1):
gset = f.glyphSet
bbox = (0, 0, 0, 0)
for i, gname in enumerate(gnames):
if hasattr(points, '__len__') and i == len(points):
points.append((bbox[2] / scale, 0))
pt = points[i] if i < len(points) else (0, 0)
g = gset[gname]._glyph
if g is None or not hasattr(g, 'xMin') :
gbox = (0, 0, 0, 0)
else :
gbox = (g.xMin * scale, g.yMin * scale, g.xMax * scale, g.yMax * scale)
bbox = arrayTools.unionRect(bbox, arrayTools.offsetRect(gbox, pt[0] * scale, pt[1] * scale))
return bbox
glyphsetcount = 0
def _defglyphs(f, gnames, scale=1):
global glyphsetcount
glyphsetcount += 1
gset = f.glyphSet
p = SVGPen(gset, scale)
res = "<defs><g>\n"
for gname in sorted(set(gnames)):
res += '<symbol overflow="visible" id="{}_{}">\n'.format(gname, glyphsetcount)
g = gset[gname]
p.clear()
g.draw(p)
res += '<path style="stroke:none;" d="' + str(p) + '"/>\n</symbol>\n'
res += "</g></defs>\n"
return res
def loadFont(fname):
if fname.lower().endswith(".ufo"):
ufo = Font(fname)
f = compileTTF(ufo)
else:
f = ttLib.TTFont(fname)
return f
def displayGlyphs(f, gnames, points=None, scale=None):
if not hasattr(gnames, '__len__') or isinstance(gnames, basestring):
gnames = [gnames]
if not hasattr(points, '__len__'):
points = []
if not hasattr(f, 'glyphSet'):
f.glyphSet = f.getGlyphSet()
res = _svgheader()
if points is None:
points = []
bbox = _bbox(f, gnames, points, scale or 1)
maxh = 100.
height = bbox[3] - (bbox[1] if bbox[1] < 0 else 0)
if scale is None and height > maxh:
scale = maxh / height
bbox = [x * scale for x in bbox]
res += _defglyphs(f, gnames, scale)
res += '<g id="surface1" transform="matrix(1,0,0,-1,{},{})">\n'.format(-bbox[0], bbox[3])
res += ' <rect x="{}" y="{}" width="{}" height="{}" style="fill:white;stroke:none"/>\n'.format(
bbox[0], bbox[1], bbox[2]-bbox[0], bbox[3])
res += ' <g style="fill:black">\n'
for i, gname in enumerate(gnames):
pt = points[i] if i < len(points) else (0, 0)
res += ' <use xlink:href="#{0}_{3}" x="{1}" y="{2}"/>\n'.format(gname, pt[0] * scale, pt[1] * scale, glyphsetcount)
res += ' </g></g>\n</svg>\n'
return SVG(data=res)
#return res
def displayText(f, text, features = [], lang=None, dir="", script="", shapers="", size=0):
import harfbuzz
glyphs = harfbuzz.shape_text(f, text, features, lang, dir, script, shapers)
gnames = []
points = []
x = 0
y = 0
for g in glyphs:
gnames.append(f.getGlyphName(g.gid))
points.append((x+g.offset[0], y+g.offset[1]))
x += g.advance[0]
y += g.advance[1]
if size == 0:
scale = None
else:
upem = f['head'].unitsPerEm
scale = 4. * size / (upem * 3.)
return displayGlyphs(f, gnames, points, scale=scale)
def displayRaw(text):
# res = "<html><body>"+text.encode('utf-8')+"</body></html>"
res = u"<html><body><p>"+text+u"</p></body></html>"
return HTML(data=res)
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