Invert direction for downwards glyphs #1117
Merged
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Closes #1115

See https://freetype.org/freetype2/docs/reference/ft2-base_interface.html#ft_glyphslotrec
bitmap_top
can be negative, meaning that glyph direction is downward, this PR fixes the crash when contour can not display such glyphs, this is itself a hack since this is not how properly handle this case i suppose.For example such figures still can be generated in contour