def build(self):
# TODO: Consider emitting multiple subtables to save space.
# Partition the marks and bases into disjoint subsets, so that
# MarkBasePos rules would only access glyphs from a single
# subset. This would likely lead to smaller mark/base
# matrices, so we might be able to omit many of the empty
# anchor tables that we currently produce. Of course, this
# would only work if the MarkBasePos rules of real-world fonts
# allow partitioning into multiple subsets. We should find out
# whether this is the case; if so, implement the optimization.
st = otTables.MarkBasePos()
st.Format = 1
st.MarkCoverage = \
self.buildCoverage_(self.marks, otTables.MarkCoverage)
markClasses = self.buildMarkClasses_(self.marks)
st.ClassCount = len(markClasses)
self.setMarkArray_(self.marks, markClasses, st)
st.BaseCoverage = \
self.buildCoverage_(self.bases, otTables.BaseCoverage)
st.BaseArray = otTables.BaseArray()
st.BaseArray.BaseCount = len(st.BaseCoverage.glyphs)
st.BaseArray.BaseRecord = []
for base in st.BaseCoverage.glyphs:
baserec = otTables.BaseRecord()
st.BaseArray.BaseRecord.append(baserec)
baserec.BaseAnchor = []
for markClass in sorted(markClasses.keys(), key=markClasses.get):
baserec.BaseAnchor.append(self.bases[base].get(markClass))
return self.buildLookup_([st])
def buildMarkBasePosSubtable(marks, bases, glyphMap):
"""Build a single MarkBasePos subtable.
a1, a2, a3, a4, a5 = buildAnchor(500, 100), ...
marks = {"acute": (0, a1), "grave": (0, a1), "cedilla": (1, a2)}
bases = {"a": {0: a3, 1: a5}, "b": {0: a4, 1: a5}}
"""
self = ot.MarkBasePos()
self.Format = 1
self.MarkCoverage = buildCoverage(marks, glyphMap)
self.MarkArray = buildMarkArray(marks, glyphMap)
self.ClassCount = max([mc for mc, _ in marks.values()]) + 1
self.BaseCoverage = buildCoverage(bases, glyphMap)
self.BaseArray = buildBaseArray(bases, self.ClassCount, glyphMap)
return self
def test_splitMarkBasePos():
from fontTools.otlLib.builder import buildAnchor, buildMarkBasePosSubtable
marks = {
"acutecomb": (0, buildAnchor(0, 600)),
"gravecomb": (0, buildAnchor(0, 590)),
"cedillacomb": (1, buildAnchor(0, 0)),
}
bases = {
"a": {
0: buildAnchor(350, 500),
1: None,
},
"c": {
0: buildAnchor(300, 700),
1: buildAnchor(300, 0),
},
}
glyphOrder = ["a", "c", "acutecomb", "gravecomb", "cedillacomb"]
glyphMap = {g: i for i, g in enumerate(glyphOrder)}
oldSubTable = buildMarkBasePosSubtable(marks, bases, glyphMap)
oldSubTable.MarkCoverage.Format = oldSubTable.BaseCoverage.Format = 1
newSubTable = otTables.MarkBasePos()
ok = otTables.splitMarkBasePos(oldSubTable,
newSubTable,
overflowRecord=None)
assert ok
assert oldSubTable.Format == newSubTable.Format
assert oldSubTable.MarkCoverage.glyphs == ["acutecomb", "gravecomb"]
assert newSubTable.MarkCoverage.glyphs == ["cedillacomb"]
assert newSubTable.MarkCoverage.Format == 1
assert oldSubTable.BaseCoverage.glyphs == newSubTable.BaseCoverage.glyphs
assert newSubTable.BaseCoverage.Format == 1
assert oldSubTable.ClassCount == newSubTable.ClassCount == 1
assert oldSubTable.MarkArray.MarkCount == 2
assert newSubTable.MarkArray.MarkCount == 1
assert oldSubTable.BaseArray.BaseCount == newSubTable.BaseArray.BaseCount
assert newSubTable.BaseArray.BaseRecord[0].BaseAnchor[0] is None
assert newSubTable.BaseArray.BaseRecord[1].BaseAnchor[0] == buildAnchor(
300, 0)
def test_splitMarkBasePos():
from fontTools.otlLib.builder import buildAnchor, buildMarkBasePosSubtable
marks = {
"acutecomb": (0, buildAnchor(0, 600)),
"gravecomb": (0, buildAnchor(0, 590)),
"cedillacomb": (1, buildAnchor(0, 0)),
}
bases = {
"a": {
0: buildAnchor(350, 500),
1: None,
},
"c": {
0: buildAnchor(300, 700),
1: buildAnchor(300, 0),
},
}
glyphOrder = ["a", "c", "acutecomb", "gravecomb", "cedillacomb"]
glyphMap = {g: i for i, g in enumerate(glyphOrder)}
oldSubTable = buildMarkBasePosSubtable(marks, bases, glyphMap)
newSubTable = otTables.MarkBasePos()
ok = otTables.splitMarkBasePos(oldSubTable,
newSubTable,
overflowRecord=None)
assert ok
assert getXML(oldSubTable.toXML) == [
'<MarkBasePos Format="1">',
' <MarkCoverage>',
' <Glyph value="acutecomb"/>',
' <Glyph value="gravecomb"/>',
' </MarkCoverage>',
' <BaseCoverage>',
' <Glyph value="a"/>',
' <Glyph value="c"/>',
' </BaseCoverage>',
' <!-- ClassCount=1 -->',
' <MarkArray>',
' <!-- MarkCount=2 -->',
' <MarkRecord index="0">',
' <Class value="0"/>',
' <MarkAnchor Format="1">',
' <XCoordinate value="0"/>',
' <YCoordinate value="600"/>',
' </MarkAnchor>',
' </MarkRecord>',
' <MarkRecord index="1">',
' <Class value="0"/>',
' <MarkAnchor Format="1">',
' <XCoordinate value="0"/>',
' <YCoordinate value="590"/>',
' </MarkAnchor>',
' </MarkRecord>',
' </MarkArray>',
' <BaseArray>',
' <!-- BaseCount=2 -->',
' <BaseRecord index="0">',
' <BaseAnchor index="0" Format="1">',
' <XCoordinate value="350"/>',
' <YCoordinate value="500"/>',
' </BaseAnchor>',
' </BaseRecord>',
' <BaseRecord index="1">',
' <BaseAnchor index="0" Format="1">',
' <XCoordinate value="300"/>',
' <YCoordinate value="700"/>',
' </BaseAnchor>',
' </BaseRecord>',
' </BaseArray>',
'</MarkBasePos>',
]
assert getXML(newSubTable.toXML) == [
'<MarkBasePos Format="1">',
' <MarkCoverage>',
' <Glyph value="cedillacomb"/>',
' </MarkCoverage>',
' <BaseCoverage>',
' <Glyph value="a"/>',
' <Glyph value="c"/>',
' </BaseCoverage>',
' <!-- ClassCount=1 -->',
' <MarkArray>',
' <!-- MarkCount=1 -->',
' <MarkRecord index="0">',
' <Class value="0"/>',
' <MarkAnchor Format="1">',
' <XCoordinate value="0"/>',
' <YCoordinate value="0"/>',
' </MarkAnchor>',
' </MarkRecord>',
' </MarkArray>',
' <BaseArray>',
' <!-- BaseCount=2 -->',
' <BaseRecord index="0">',
' <BaseAnchor index="0" empty="1"/>',
' </BaseRecord>',
' <BaseRecord index="1">',
' <BaseAnchor index="0" Format="1">',
' <XCoordinate value="300"/>',
' <YCoordinate value="0"/>',
' </BaseAnchor>',
' </BaseRecord>',
' </BaseArray>',
'</MarkBasePos>',
]