import DefaultTable
import sstruct
from fontTools.misc.textTools import safeEval
vheaFormat = """
> # big endian
tableVersion: 16.16F
ascent: h
descent: h
lineGap: h
advanceHeightMax: H
minTopSideBearing: h
minBottomSideBearing: h
yMaxExtent: h
caretSlopeRise: h
caretSlopeRun: h
reserved0: h
reserved1: h
reserved2: h
reserved3: h
reserved4: h
metricDataFormat: h
numberOfVMetrics: H
"""
class table__v_h_e_a(DefaultTable.DefaultTable):
dependencies = ['vmtx', 'glyf']
def decompile(self, data, ttFont):
sstruct.unpack(vheaFormat, data, self)
def compile(self, ttFont):
self.recalc(ttFont)
return sstruct.pack(vheaFormat, self)
def recalc(self, ttFont):
vtmxTable = ttFont['vmtx']
if ttFont.has_key('glyf'):
if not ttFont.isLoaded('glyf'):
return
glyfTable = ttFont['glyf']
advanceHeightMax = -100000 # arbitrary big negative number
minTopSideBearing = 100000 # arbitrary big number
minBottomSideBearing = 100000 # arbitrary big number
yMaxExtent = -100000 # arbitrary big negative number
for name in ttFont.getGlyphOrder():
height, tsb = vtmxTable[name]
g = glyfTable[name]
if g.numberOfContours <= 0:
continue
advanceHeightMax = max(advanceHeightMax, height)
minTopSideBearing = min(minTopSideBearing, tsb)
rsb = height - tsb - (g.yMax - g.yMin)
minBottomSideBearing = min(minBottomSideBearing, rsb)
extent = tsb + (g.yMax - g.yMin)
yMaxExtent = max(yMaxExtent, extent)
self.advanceHeightMax = advanceHeightMax
self.minTopSideBearing = minTopSideBearing
self.minBottomSideBearing = minBottomSideBearing
self.yMaxExtent = yMaxExtent
else:
# XXX CFF recalc...
pass
def toXML(self, writer, ttFont):
formatstring, names, fixes = sstruct.getformat(vheaFormat)
for name in names:
value = getattr(self, name)
if type(value) == type(0L):
value = int(value)
writer.simpletag(name, value=value)
writer.newline()
def fromXML(self, (name, attrs, content), ttFont):
setattr(self, name, safeEval(attrs["value"]))
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