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- """ TSI{0,1,2,3,5} are private tables used by Microsoft Visual TrueType (VTT)
- tool to store its hinting source data.
- TSI0 is the index table containing the lengths and offsets for the glyph
- programs and 'extra' programs ('fpgm', 'prep', and 'cvt') that are contained
- in the TSI1 table.
- """
- from . import DefaultTable
- import struct
- tsi0Format = ">HHL"
- def fixlongs(glyphID, textLength, textOffset):
- return int(glyphID), int(textLength), textOffset
- class table_T_S_I__0(DefaultTable.DefaultTable):
- dependencies = ["TSI1"]
- def decompile(self, data, ttFont):
- numGlyphs = ttFont["maxp"].numGlyphs
- indices = []
- size = struct.calcsize(tsi0Format)
- for i in range(numGlyphs + 5):
- glyphID, textLength, textOffset = fixlongs(
- *struct.unpack(tsi0Format, data[:size])
- )
- indices.append((glyphID, textLength, textOffset))
- data = data[size:]
- assert len(data) == 0
- assert indices[-5] == (0xFFFE, 0, 0xABFC1F34), "bad magic number"
- self.indices = indices[:-5]
- self.extra_indices = indices[-4:]
- def compile(self, ttFont):
- if not hasattr(self, "indices"):
- # We have no corresponding table (TSI1 or TSI3); let's return
- # no data, which effectively means "ignore us".
- return b""
- data = b""
- for index, textLength, textOffset in self.indices:
- data = data + struct.pack(tsi0Format, index, textLength, textOffset)
- data = data + struct.pack(tsi0Format, 0xFFFE, 0, 0xABFC1F34)
- for index, textLength, textOffset in self.extra_indices:
- data = data + struct.pack(tsi0Format, index, textLength, textOffset)
- return data
- def set(self, indices, extra_indices):
- # gets called by 'TSI1' or 'TSI3'
- self.indices = indices
- self.extra_indices = extra_indices
- def toXML(self, writer, ttFont):
- writer.comment("This table will be calculated by the compiler")
- writer.newline()
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