On 5/12/2021 11:46 PM, Marcel Fabian Krüger wrote:
Hi,recently we got an interesting bug report in luaotfload (the original report is at https://github.com/latex3/luaotfload/issues/184) which relates to the ConTeXt fontloader. Take the following ConTeXt example: \starttext \definefontfeature [default:bold] [default] [axis={weight=500}] \definedfont[file:NotoSansCJKsc-VF.otf*default:bold @ 10pt]U+5E2E 帮 \stoptextThe font is available at https://github.com/googlefonts/noto-cjk/raw/main/Sans/Variable/OTF/NotoSansCJKsc-VF.otf. This compiles correctly, but the CJK glyph do not appear since it's Type2 CharString is invalid. The CFF2 CharStrings of this glyph invokes the rrcurveto operator with 63 arguments, which is
66 etc .. multiples of 6
allowed in CFF2 where the argument limit is 513, but not allowed in Type2 where the limit is at 48.
a rather low limit right from the start (we can assume only rrcurveto is affected)
It would be great if ConTeXt could check for this and insert additional rrcuveto operators when necessary to avoid this issue.
after some experiments ... attached
(no upload yet as i'm renaming some low level helpers which needs testing)
Hans
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Hans Hagen | PRAGMA ADE
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largestack.pdf
Description: Adobe PDF document
\definefontfeature
[default:bold]
[default]
[axis={weight=500}]
\definefontfeature
[default:heavy]
[default]
[axis={weight=800}]
\definefontfeature
[default:light]
[default]
[axis={weight=250}]
\definefont
[DemoFontBold]
[file:NotoSansCJKsc-VF.otf*default:bold @ 10pt]
\definefont
[DemoFontHeavy]
[file:NotoSansCJKsc-VF.otf*default:heavy @ 10pt]
\definefont
[DemoFontLight]
[file:NotoSansCJKsc-VF.otf*default:light @ 10pt]
\startTEXpage
\DemoFontBold \char"5E2D\kern10pt\char"5E2E\kern10pt\char"5E2F\par
\DemoFontHeavy \char"5E2D\kern10pt\char"5E2E\kern10pt\char"5E2F\par
\DemoFontLight \char"5E2D\kern10pt\char"5E2E\kern10pt\char"5E2F
\stopTEXpage
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