Noto Emoji COLRv1

23 May 2023

      Hi Hans,

I tried using the code from [1] for Noto Emoji in COLRv1 format [2]:

   \startTEXpage
       \definefontfeature[colored][default][colr=9]
       \definedfont[Noto-COLRv1.ttf*colored] 🦆 % U+1F986
   \stopTEXpage

but ConTeXt gives the following error:

   fonts           > otf loading > loading 'Noto-COLRv1.ttf', hash 'noto-colrv1'
   otf reader      > table version 1 of 'colr' is partially supported for font Noto-COLRv1.ttf
   otf reader      > unsupported colr type 2 paint format 0
   otf reader      > unsupported colr type 2 paint format %i
   otf reader      > fatal error in file 'Noto-COLRv1.ttf': ...ext/tex/texmf-context/tex/context/base/mkxl/font-dsp.lmt:3575: table index is nil
   stack traceback:
   	...ext/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2344: in metamethod 'newindex'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-dsp.lmt:3575: in metamethod 'index'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-dsp.lmt:3677: in metamethod 'index'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-dsp.lmt:3150: in upvalue 'getpaintoffset'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-dsp.lmt:3564: in field '?'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-dsp.lmt:3677: in metamethod 'index'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-dsp.lmt:3685: in local 'reader'
   	...ext/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2089: in upvalue 'readtable'
   	...ext/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2204: in upvalue 'readdata'
   	...ext/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2257: in function <...ext/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2240>
   	[C]: in function 'xpcall'
   	...ext/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2346: in upvalue 'loadfont'
   	...ext/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2401: in field 'loadfont'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-otl.lmt:160: in field 'load'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-otl.lmt:624: in upvalue 'otftotfm'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-otl.lmt:652: in function <...ext/tex/texmf-context/tex/context/base/mkxl/font-otl.lmt:651>
   	(...tail calls...)
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-def.lmt:362: in function <...ext/tex/texmf-context/tex/context/base/mkxl/font-def.lmt:350>
   	(...tail calls...)
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-def.lmt:465: in field 'read'
   	...ext/tex/texmf-context/tex/context/base/mkxl/font-ctx.lmt:1371: in function <...ext/tex/texmf-context/tex/context/base/mkxl/font-ctx.lmt:1228>
   	(...tail calls...)
   fonts           > otf loading > loading failed due to read error
   fonts           > defining > forced type 'ttf' of 'Noto-COLRv1' not found
   fonts           > defining > unable to define 'Noto-COLRv1.ttf' as 'thedefinedfont--0'
   system          > print height forced to paper height
   system          > print width forced to paper width
   fonts           > checking > char 🦆 (U+1F986) in font 'LMRoman10-Regular' with id 1: missing
...
From what I can tell, the Lua code is trying to read past the end of
font file. I tried debugging the error further, but this is well beyond
my understanding.
(Also, paintreaders[6--11] in font-dsp.lmt are missing "offset" in the
function signature, and paintreaders itself is glboal. Maybe related?)

I'm using the current latest (2023.05.08 17:39).

Thanks,
-- Max

[1]: https://mailman.ntg.nl/pipermail/ntg-context/2022/107279.html
[2]: https://github.com/googlefonts/noto-emoji/raw/main/fonts/Noto-COLRv1.ttf

Max Chernoff

Hans Hagen

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