"""TSI{0,1,2,3,5} are private tables used by Microsoft Visual TrueType (VTT)
tool to store its hinting source data.
TSI5 contains the VTT character groups.
See also https://learn.microsoft.com/en-us/typography/tools/vtt/tsi-tables
"""
import array
import logging
import sys
from fontTools.misc.textTools import safeEval
from . import DefaultTable
log = logging.getLogger(__name__)
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class table_T_S_I__5(DefaultTable.DefaultTable):
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def decompile(self, data, ttFont):
numGlyphs = ttFont["maxp"].numGlyphs
a = array.array("H")
a.frombytes(data)
if sys.byteorder != "big":
a.byteswap()
self.glyphGrouping = {}
numEntries = len(data) // 2
if numEntries != numGlyphs:
diff = numEntries - numGlyphs
log.warning(
"Number of entries differs from the number of glyphs in the font "
f"by {abs(diff)} ({numEntries} entries vs. {numGlyphs} glyphs)."
)
for i in range(numEntries):
self.glyphGrouping[ttFont.getGlyphName(i)] = a[i]
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def compile(self, ttFont):
glyphNames = ttFont.getGlyphOrder()
a = array.array("H")
for i in range(len(glyphNames)):
a.append(self.glyphGrouping.get(glyphNames[i], 0))
if sys.byteorder != "big":
a.byteswap()
return a.tobytes()
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def toXML(self, writer, ttFont):
names = sorted(self.glyphGrouping.keys())
for glyphName in names:
writer.simpletag(
"glyphgroup", name=glyphName, value=self.glyphGrouping[glyphName]
)
writer.newline()
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def fromXML(self, name, attrs, content, ttFont):
if not hasattr(self, "glyphGrouping"):
self.glyphGrouping = {}
if name != "glyphgroup":
return
self.glyphGrouping[attrs["name"]] = safeEval(attrs["value"])