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[gvar] Speed up loading by not reading all offsets

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This commit is contained in:
Behdad Esfahbod 2023-12-16 20:53:20 -07:00
parent 61916c1034
commit 7471ac6d4d
1 changed files with 28 additions and 17 deletions
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45
Lib/fontTools/ttLib/tables/_g_v_a_r.py
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@ -52,6 +52,26 @@ class _LazyDict(UserDict):
return v
def _decompileVarGlyph(self, glyphName):
gid = self.reverseGlyphMap[glyphName]
offsetSize = 2 if self.tableFormat == 0 else 4
startOffset = GVAR_HEADER_SIZE + offsetSize * gid
endOffset = startOffset + offsetSize * 2
offsets = table__g_v_a_r.decompileOffsets_(
self.gvarData[startOffset:endOffset],
tableFormat=self.tableFormat,
glyphCount=1,
)
gvarData = self.gvarData[
self.offsetToData + offsets[0] : self.offsetToData + offsets[1]
]
if not gvarData:
return []
glyph = self._glyf[glyphName]
numPointsInGlyph = self._gvar.getNumPoints_(glyph)
return decompileGlyph_(numPointsInGlyph, self.sharedCoords, self.axisTags, gvarData)
class table__g_v_a_r(DefaultTable.DefaultTable):
dependencies = ["fvar", "glyf"]
@ -116,11 +136,6 @@ class table__g_v_a_r(DefaultTable.DefaultTable):
sstruct.unpack(GVAR_HEADER_FORMAT, data[0:GVAR_HEADER_SIZE], self)
assert len(glyphs) == self.glyphCount
assert len(axisTags) == self.axisCount
offsets = self.decompileOffsets_(
data[GVAR_HEADER_SIZE:],
tableFormat=(self.flags & 1),
glyphCount=self.glyphCount,
)
sharedCoords = tv.decompileSharedTuples(
axisTags, self.sharedTupleCount, data, self.offsetToSharedTuples
)
@ -128,21 +143,17 @@ class table__g_v_a_r(DefaultTable.DefaultTable):
offsetToData = self.offsetToGlyphVariationData
glyf = ttFont["glyf"]
def decompileVarGlyph(self, glyphName):
gid = self.reverseGlyphMap[glyphName]
gvarData = data[
offsetToData + offsets[gid] : offsetToData + offsets[gid + 1]
]
if not gvarData:
return []
glyph = self._glyf[glyphName]
numPointsInGlyph = self._gvar.getNumPoints_(glyph)
return decompileGlyph_(numPointsInGlyph, sharedCoords, axisTags, gvarData)
l = _LazyDict({glyphs[gid]: decompileVarGlyph for gid in range(self.glyphCount)})
l = _LazyDict(
{glyphs[gid]: _decompileVarGlyph for gid in range(self.glyphCount)}
)
l.reverseGlyphMap = ttFont.getReverseGlyphMap()
l._glyf = glyf
l._gvar = self
l.gvarData = data
l.offsetToData = offsetToData
l.sharedCoords = sharedCoords
l.axisTags = axisTags
l.tableFormat = self.flags & 1
self.variations = l