import DefaultTable
import sstruct
from fontTools.misc.textTools import safeEval
hheaFormat = """
> # big endian
tableVersion: 16.16F
ascent: h
descent: h
lineGap: h
advanceWidthMax: H
minLeftSideBearing: h
minRightSideBearing: h
xMaxExtent: h
caretSlopeRise: h
caretSlopeRun: h
caretOffset: h
reserved0: h
reserved1: h
reserved2: h
reserved3: h
metricDataFormat: h
numberOfHMetrics: H
"""
class table__h_h_e_a(DefaultTable.DefaultTable):
dependencies = ['hmtx', 'glyf']
def decompile(self, data, ttFont):
sstruct.unpack(hheaFormat, data, self)
def compile(self, ttFont):
if ttFont.isLoaded('glyf') and ttFont.recalcBBoxes:
self.recalc(ttFont)
return sstruct.pack(hheaFormat, self)
def recalc(self, ttFont):
hmtxTable = ttFont['hmtx']
if ttFont.has_key('glyf'):
glyfTable = ttFont['glyf']
advanceWidthMax = -100000 # arbitrary big negative number
minLeftSideBearing = 100000 # arbitrary big number
minRightSideBearing = 100000 # arbitrary big number
xMaxExtent = -100000 # arbitrary big negative number
for name in ttFont.getGlyphOrder():
width, lsb = hmtxTable[name]
g = glyfTable[name]
if g.numberOfContours <= 0:
continue
advanceWidthMax = max(advanceWidthMax, width)
minLeftSideBearing = min(minLeftSideBearing, lsb)
rsb = width - lsb - (g.xMax - g.xMin)
minRightSideBearing = min(minRightSideBearing, rsb)
extent = lsb + (g.xMax - g.xMin)
xMaxExtent = max(xMaxExtent, extent)
self.advanceWidthMax = advanceWidthMax
self.minLeftSideBearing = minLeftSideBearing
self.minRightSideBearing = minRightSideBearing
self.xMaxExtent = xMaxExtent
else:
# XXX CFF recalc...
pass
def toXML(self, writer, ttFont):
formatstring, names, fixes = sstruct.getformat(hheaFormat)
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"]))
|