167 lines
6.9 KiB
Python
167 lines
6.9 KiB
Python
""" TSI{0,1,2,3,5} are private tables used by Microsoft Visual TrueType (VTT)
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tool to store its hinting source data.
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TSI1 contains the text of the glyph programs in the form of low-level assembly
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code, as well as the 'extra' programs 'fpgm', 'ppgm' (i.e. 'prep'), and 'cvt'.
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See also https://learn.microsoft.com/en-us/typography/tools/vtt/tsi-tables
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"""
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from . import DefaultTable
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from fontTools.misc.loggingTools import LogMixin
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from fontTools.misc.textTools import strjoin, tobytes, tostr
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class table_T_S_I__1(LogMixin, DefaultTable.DefaultTable):
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extras = {0xFFFA: "ppgm", 0xFFFB: "cvt", 0xFFFC: "reserved", 0xFFFD: "fpgm"}
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indextable = "TSI0"
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def decompile(self, data, ttFont):
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totalLength = len(data)
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indextable = ttFont[self.indextable]
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for indices, isExtra in zip(
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(indextable.indices, indextable.extra_indices), (False, True)
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):
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programs = {}
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for i, (glyphID, textLength, textOffset) in enumerate(indices):
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if isExtra:
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name = self.extras[glyphID]
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else:
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name = ttFont.getGlyphName(glyphID)
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if textOffset > totalLength:
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self.log.warning("textOffset > totalLength; %r skipped" % name)
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continue
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if textLength < 0x8000:
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# If the length stored in the record is less than 32768, then use
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# that as the length of the record.
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pass
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elif textLength == 0x8000:
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# If the length is 32768, compute the actual length as follows:
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isLast = i == (len(indices) - 1)
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if isLast:
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if isExtra:
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# For the last "extra" record (the very last record of the
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# table), the length is the difference between the total
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# length of the TSI1 table and the textOffset of the final
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# record.
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nextTextOffset = totalLength
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else:
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# For the last "normal" record (the last record just prior
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# to the record containing the "magic number"), the length
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# is the difference between the textOffset of the record
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# following the "magic number" (0xFFFE) record (i.e. the
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# first "extra" record), and the textOffset of the last
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# "normal" record.
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nextTextOffset = indextable.extra_indices[0][2]
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else:
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# For all other records with a length of 0x8000, the length is
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# the difference between the textOffset of the record in
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# question and the textOffset of the next record.
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nextTextOffset = indices[i + 1][2]
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assert nextTextOffset >= textOffset, "entries not sorted by offset"
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if nextTextOffset > totalLength:
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self.log.warning(
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"nextTextOffset > totalLength; %r truncated" % name
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)
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nextTextOffset = totalLength
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textLength = nextTextOffset - textOffset
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else:
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from fontTools import ttLib
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raise ttLib.TTLibError(
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"%r textLength (%d) must not be > 32768" % (name, textLength)
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)
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text = data[textOffset : textOffset + textLength]
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assert len(text) == textLength
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text = tostr(text, encoding="utf-8")
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if text:
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programs[name] = text
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if isExtra:
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self.extraPrograms = programs
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else:
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self.glyphPrograms = programs
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def compile(self, ttFont):
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if not hasattr(self, "glyphPrograms"):
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self.glyphPrograms = {}
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self.extraPrograms = {}
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data = b""
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indextable = ttFont[self.indextable]
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glyphNames = ttFont.getGlyphOrder()
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indices = []
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for i in range(len(glyphNames)):
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if len(data) % 2:
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data = (
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data + b"\015"
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) # align on 2-byte boundaries, fill with return chars. Yum.
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name = glyphNames[i]
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if name in self.glyphPrograms:
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text = tobytes(self.glyphPrograms[name], encoding="utf-8")
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else:
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text = b""
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textLength = len(text)
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if textLength >= 0x8000:
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textLength = 0x8000
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indices.append((i, textLength, len(data)))
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data = data + text
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extra_indices = []
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codes = sorted(self.extras.items())
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for i in range(len(codes)):
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if len(data) % 2:
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data = (
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data + b"\015"
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) # align on 2-byte boundaries, fill with return chars.
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code, name = codes[i]
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if name in self.extraPrograms:
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text = tobytes(self.extraPrograms[name], encoding="utf-8")
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else:
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text = b""
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textLength = len(text)
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if textLength >= 0x8000:
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textLength = 0x8000
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extra_indices.append((code, textLength, len(data)))
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data = data + text
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indextable.set(indices, extra_indices)
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return data
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def toXML(self, writer, ttFont):
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names = sorted(self.glyphPrograms.keys())
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writer.newline()
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for name in names:
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text = self.glyphPrograms[name]
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if not text:
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continue
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writer.begintag("glyphProgram", name=name)
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writer.newline()
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writer.write_noindent(text.replace("\r", "\n"))
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writer.newline()
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writer.endtag("glyphProgram")
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writer.newline()
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writer.newline()
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extra_names = sorted(self.extraPrograms.keys())
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for name in extra_names:
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text = self.extraPrograms[name]
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if not text:
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continue
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writer.begintag("extraProgram", name=name)
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writer.newline()
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writer.write_noindent(text.replace("\r", "\n"))
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writer.newline()
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writer.endtag("extraProgram")
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writer.newline()
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writer.newline()
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def fromXML(self, name, attrs, content, ttFont):
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if not hasattr(self, "glyphPrograms"):
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self.glyphPrograms = {}
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self.extraPrograms = {}
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lines = strjoin(content).replace("\r", "\n").split("\n")
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text = "\r".join(lines[1:-1])
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if name == "glyphProgram":
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self.glyphPrograms[attrs["name"]] = text
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elif name == "extraProgram":
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self.extraPrograms[attrs["name"]] = text
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