import sys
import DefaultTable
import numpy
from fontTools import ttLib
from fontTools.misc.textTools import safeEval
class table__h_m_t_x(DefaultTable.DefaultTable):
headerTag = 'hhea'
advanceName = 'width'
sideBearingName = 'lsb'
numberOfMetricsName = 'numberOfHMetrics'
def decompile(self, data, ttFont):
numberOfMetrics = int(getattr(ttFont[self.headerTag], self.numberOfMetricsName))
metrics = numpy.fromstring(data[:4 * numberOfMetrics],
numpy.int16)
if sys.byteorder <> "big":
metrics = metrics.byteswap()
metrics.shape = (numberOfMetrics, 2)
data = data[4 * numberOfMetrics:]
numberOfSideBearings = ttFont['maxp'].numGlyphs - numberOfMetrics
numberOfSideBearings = int(numberOfSideBearings)
if numberOfSideBearings:
assert numberOfSideBearings > 0, "bad hmtx/vmtx table"
lastAdvance = metrics[-1][0]
advances = numpy.array([lastAdvance] * numberOfSideBearings,
numpy.int16)
sideBearings = numpy.fromstring(data[:2 * numberOfSideBearings],
numpy.int16)
if sys.byteorder <> "big":
sideBearings = sideBearings.byteswap()
data = data[2 * numberOfSideBearings:]
additionalMetrics = numpy.array([advances, sideBearings],
numpy.int16)
metrics = numpy.concatenate((metrics,
numpy.transpose(additionalMetrics)))
if data:
sys.stderr.write("too much data for hmtx/vmtx table\n")
metrics = metrics.tolist()
self.metrics = {}
for i in range(len(metrics)):
glyphName = ttFont.getGlyphName(i)
self.metrics[glyphName] = metrics[i]
def compile(self, ttFont):
metrics = []
for glyphName in ttFont.getGlyphOrder():
metrics.append(self.metrics[glyphName])
lastAdvance = metrics[-1][0]
lastIndex = len(metrics)
while metrics[lastIndex-2][0] == lastAdvance:
lastIndex = lastIndex - 1
if lastIndex <= 1:
# all advances are equal
lastIndex = 1
break
additionalMetrics = metrics[lastIndex:]
additionalMetrics = map(lambda (advance, sb): sb, additionalMetrics)
metrics = metrics[:lastIndex]
setattr(ttFont[self.headerTag], self.numberOfMetricsName, len(metrics))
metrics = numpy.array(metrics, numpy.int16)
if sys.byteorder <> "big":
metrics = metrics.byteswap()
data = metrics.tostring()
additionalMetrics = numpy.array(additionalMetrics, numpy.int16)
if sys.byteorder <> "big":
additionalMetrics = additionalMetrics.byteswap()
data = data + additionalMetrics.tostring()
return data
def toXML(self, writer, ttFont):
names = self.metrics.keys()
names.sort()
for glyphName in names:
advance, sb = self.metrics[glyphName]
writer.simpletag("mtx", [
("name", glyphName),
(self.advanceName, advance),
(self.sideBearingName, sb),
])
writer.newline()
def fromXML(self, (name, attrs, content), ttFont):
if not hasattr(self, "metrics"):
self.metrics = {}
if name == "mtx":
self.metrics[attrs["name"]] = [safeEval(attrs[self.advanceName]),
safeEval(attrs[self.sideBearingName])]
def __getitem__(self, glyphName):
return self.metrics[glyphName]
def __setitem__(self, glyphName, (advance, sb)):
self.metrics[glyphName] = advance, sb
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