105 lines
2.9 KiB
Python
105 lines
2.9 KiB
Python
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class _TTGlyphSet(object):
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"""Generic dict-like GlyphSet class that pulls metrics from hmtx and
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glyph shape from TrueType or CFF.
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"""
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def __init__(self, ttFont, glyphs, glyphType):
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"""Construct a new glyphset.
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Args:
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font (TTFont): The font object (used to get metrics).
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glyphs (dict): A dictionary mapping glyph names to ``_TTGlyph`` objects.
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glyphType (class): Either ``_TTGlyphCFF`` or ``_TTGlyphGlyf``.
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"""
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self._glyphs = glyphs
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self._hmtx = ttFont['hmtx']
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self._vmtx = ttFont['vmtx'] if 'vmtx' in ttFont else None
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self._glyphType = glyphType
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def keys(self):
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return list(self._glyphs.keys())
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def has_key(self, glyphName):
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return glyphName in self._glyphs
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__contains__ = has_key
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def __getitem__(self, glyphName):
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horizontalMetrics = self._hmtx[glyphName]
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verticalMetrics = self._vmtx[glyphName] if self._vmtx else None
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return self._glyphType(
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self, self._glyphs[glyphName], horizontalMetrics, verticalMetrics)
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def __len__(self):
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return len(self._glyphs)
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def get(self, glyphName, default=None):
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try:
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return self[glyphName]
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except KeyError:
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return default
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class _TTGlyph(object):
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"""Wrapper for a TrueType glyph that supports the Pen protocol, meaning
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that it has .draw() and .drawPoints() methods that take a pen object as
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their only argument. Additionally there are 'width' and 'lsb' attributes,
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read from the 'hmtx' table.
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If the font contains a 'vmtx' table, there will also be 'height' and 'tsb'
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attributes.
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"""
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def __init__(self, glyphset, glyph, horizontalMetrics, verticalMetrics=None):
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"""Construct a new _TTGlyph.
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Args:
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glyphset (_TTGlyphSet): A glyphset object used to resolve components.
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glyph (ttLib.tables._g_l_y_f.Glyph): The glyph object.
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horizontalMetrics (int, int): The glyph's width and left sidebearing.
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"""
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self._glyphset = glyphset
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self._glyph = glyph
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self.width, self.lsb = horizontalMetrics
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if verticalMetrics:
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self.height, self.tsb = verticalMetrics
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else:
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self.height, self.tsb = None, None
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def draw(self, pen):
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"""Draw the glyph onto ``pen``. See fontTools.pens.basePen for details
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how that works.
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"""
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self._glyph.draw(pen)
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def drawPoints(self, pen):
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# drawPoints is only implemented for _TTGlyphGlyf at this time.
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raise NotImplementedError()
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class _TTGlyphCFF(_TTGlyph):
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pass
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class _TTGlyphGlyf(_TTGlyph):
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def draw(self, pen):
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"""Draw the glyph onto Pen. See fontTools.pens.basePen for details
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how that works.
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"""
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glyfTable = self._glyphset._glyphs
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glyph = self._glyph
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offset = self.lsb - glyph.xMin if hasattr(glyph, "xMin") else 0
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glyph.draw(pen, glyfTable, offset)
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def drawPoints(self, pen):
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"""Draw the glyph onto PointPen. See fontTools.pens.pointPen
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for details how that works.
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"""
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glyfTable = self._glyphset._glyphs
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glyph = self._glyph
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offset = self.lsb - glyph.xMin if hasattr(glyph, "xMin") else 0
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glyph.drawPoints(pen, glyfTable, offset)
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