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from fontTools.misc import sstruct
from fontTools.misc.textTools import safeEval
from fontTools.misc.fixedTools import (
ensureVersionIsLong as fi2ve, versionToFixed as ve2fi)
from . import DefaultTable
import math
vheaFormat = """
> # big endian
tableVersion: L
ascent: h
descent: h
lineGap: h
advanceHeightMax: H
minTopSideBearing: h
minBottomSideBearing: h
yMaxExtent: h
caretSlopeRise: h
caretSlopeRun: h
caretOffset: h
reserved1: h
reserved2: h
reserved3: h
reserved4: h
metricDataFormat: h
numberOfVMetrics: H
"""
class table__v_h_e_a(DefaultTable.DefaultTable):
# Note: Keep in sync with table__h_h_e_a
dependencies = ['vmtx', 'glyf', 'CFF ', 'CFF2']
def decompile(self, data, ttFont):
sstruct.unpack(vheaFormat, data, self)
def compile(self, ttFont):
if ttFont.recalcBBoxes and (ttFont.isLoaded('glyf') or ttFont.isLoaded('CFF ') or ttFont.isLoaded('CFF2')):
self.recalc(ttFont)
self.tableVersion = fi2ve(self.tableVersion)
return sstruct.pack(vheaFormat, self)
def recalc(self, ttFont):
if 'vmtx' in ttFont:
vmtxTable = ttFont['vmtx']
self.advanceHeightMax = max(adv for adv, _ in vmtxTable.metrics.values())
boundsHeightDict = {}
if 'glyf' in ttFont:
glyfTable = ttFont['glyf']
for name in ttFont.getGlyphOrder():
g = glyfTable[name]
if g.numberOfContours == 0:
continue
if g.numberOfContours < 0 and not hasattr(g, "yMax"):
# Composite glyph without extents set.
# Calculate those.
g.recalcBounds(glyfTable)
boundsHeightDict[name] = g.yMax - g.yMin
elif 'CFF ' in ttFont or 'CFF2' in ttFont:
if 'CFF ' in ttFont:
topDict = ttFont['CFF '].cff.topDictIndex[0]
else:
topDict = ttFont['CFF2'].cff.topDictIndex[0]
charStrings = topDict.CharStrings
for name in ttFont.getGlyphOrder():
cs = charStrings[name]
bounds = cs.calcBounds(charStrings)
if bounds is not None:
boundsHeightDict[name] = int(
math.ceil(bounds[3]) - math.floor(bounds[1]))
if boundsHeightDict:
minTopSideBearing = float('inf')
minBottomSideBearing = float('inf')
yMaxExtent = -float('inf')
for name, boundsHeight in boundsHeightDict.items():
advanceHeight, tsb = vmtxTable[name]
bsb = advanceHeight - tsb - boundsHeight
extent = tsb + boundsHeight
minTopSideBearing = min(minTopSideBearing, tsb)
minBottomSideBearing = min(minBottomSideBearing, bsb)
yMaxExtent = max(yMaxExtent, extent)
self.minTopSideBearing = minTopSideBearing
self.minBottomSideBearing = minBottomSideBearing
self.yMaxExtent = yMaxExtent
else: # No glyph has outlines.
self.minTopSideBearing = 0
self.minBottomSideBearing = 0
self.yMaxExtent = 0
def toXML(self, writer, ttFont):
formatstring, names, fixes = sstruct.getformat(vheaFormat)
for name in names:
value = getattr(self, name)
if name == "tableVersion":
value = fi2ve(value)
value = "0x%08x" % value
writer.simpletag(name, value=value)
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
if name == "tableVersion":
setattr(self, name, ve2fi(attrs["value"]))
return
setattr(self, name, safeEval(attrs["value"]))
# reserved0 is caretOffset for legacy reasons
@property
def reserved0(self):
return self.caretOffset
@reserved0.setter
def reserved0(self, value):
self.caretOffset = value
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