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PostScript glyph drawing operations can be expressed in multiple different
ways. For example, as well as the ``lineto`` operator, there is also a
``hlineto`` operator which draws a horizontal line, removing the need to
specify a ``dx`` coordinate, and a ``vlineto`` operator which draws a
vertical line, removing the need to specify a ``dy`` coordinate. As well
as decompiling :class:`fontTools.misc.psCharStrings.T2CharString` objects
into lists of operations, this module allows for conversion between general
and specific forms of the operation.
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A rB|jd}|jd|gf | dkr|r`|jd|f |j| g f |jdt |gf n|j| |f g }q(W |r|jd|f |S )u Takes a T2CharString program list and returns list of commands.
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hintmask/cntrmask argument, as well as stray arguments at the end of the
program (¯\_(ツ)_/¯).
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number of regions. 'getNumRegions' takes a single argument, vsindex. If
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of regions for the charstring, else it returns the numRegions for
the vsindex.
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non-blend operator has an odd number of arguments, then the first argument is
a width, and is popped off. This is complicated with blend operators, as
there may be more than one before the first hint or moveto operator, and each
one reduces several arguments to just one list argument. We have to sum the
number of arguments that are not part of the blend arguments, and all the
'numBlends' values. We could instead have said that by definition, if there
is a blend operator, there is no width value, since CFF2 Charstrings don't
have width values. I discussed this with Behdad, and we are allowing for an
initial width value in this case because developers may assemble a CFF2
charstring from CFF Charstrings, which could have width values.
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