NotoColorEmoji - loca table not found

NotoColorEmoji - loca table not found

[Adam Reviczky]

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Hi,

I am trying to use the 'handshake' character (
https://www.fileformat.info/info/unicode/char/1f91d/fontsupport.htm) from
the Noto Color Emoji font (
https://github.com/googlefonts/noto-emoji/blob/main/fonts/NotoColorEmoji.ttf
).

The following MWE gives an error:

\starttext

\definedfont[file:NotoColorEmoji.ttf] \char"1F91D

\stoptext

fonts           > otf loading > loading 'NotoColorEmoji.ttf', hash
'notocoloremoji'
system          > lua > compiling
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
into
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
system          > lua > dumping
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
into
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
stripped
fonts           > otf loading > loading done
fonts           > otf loading > saving 'NotoColorEmoji.ttf' in cache
system          > lua > compiling
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
into
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
system          > lua > dumping
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
into
'/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
stripped
fonts           > otf loading > loading, optimizing, packing and caching
time 2.557
pages           > flushing realpage 1, userpage 1, subpage 1
close source    > level 2, order 3, name '/tmp/MWE.tex'
close source    > level 1, order 3, name
'/usr/share/texmf/tex/context/base/mkiv/cont-yes.mkiv'
! error:  (file NotoColorEmoji.ttf) (ttf): loca table not foundmtx-context
    | fatal error: return code: 256

Any idea what is wrong?

Adam

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Re: NotoColorEmoji - loca table not found

[Jairo A. del Rio]

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In ConTeXt LMTX this works just fine (try mtxrun --generate and context
--make first):

\definefontfeature[Emoji][default][sbix=yes]

\starttext

\definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D

\stoptext

However, when one tries to convert it with ImageMagick the following
happens:

   **** Error reading a content stream. The page may be incomplete.
               Output may be incorrect.
   **** Error: Ignoring spurious ET operator.
               Output may be incorrect.
   **** Error: File did not complete the page properly and may be damaged.
               Output may be incorrect.


Only SVG fonts don't trigger this error in LMTX.


I confirm ConTeXt MkIV is having issues with emoji fonts. It seems that
GraphicsMagick is not properly generating images as it complains about an
improper header.

Jairo

El jue, 13 de may. de 2021 a la(s) 18:26, Adam Reviczky (reviczky@gmail.com)
escribió:

> Hi,
>
> I am trying to use the 'handshake' character (
> https://www.fileformat.info/info/unicode/char/1f91d/fontsupport.htm) from
> the Noto Color Emoji font (
> https://github.com/googlefonts/noto-emoji/blob/main/fonts/NotoColorEmoji.ttf
> ).
>
> The following MWE gives an error:
>
> \starttext
>
> \definedfont[file:NotoColorEmoji.ttf] \char"1F91D
>
> \stoptext
>
> fonts           > otf loading > loading 'NotoColorEmoji.ttf', hash
> 'notocoloremoji'
> system          > lua > compiling
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
> into
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
> system          > lua > dumping
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
> into
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
> stripped
> fonts           > otf loading > loading done
> fonts           > otf loading > saving 'NotoColorEmoji.ttf' in cache
> system          > lua > compiling
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
> into
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
> system          > lua > dumping
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
> into
> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
> stripped
> fonts           > otf loading > loading, optimizing, packing and caching
> time 2.557
> pages           > flushing realpage 1, userpage 1, subpage 1
> close source    > level 2, order 3, name '/tmp/MWE.tex'
> close source    > level 1, order 3, name
> '/usr/share/texmf/tex/context/base/mkiv/cont-yes.mkiv'
> ! error:  (file NotoColorEmoji.ttf) (ttf): loca table not foundmtx-context
>     | fatal error: return code: 256
>
> Any idea what is wrong?
>
> Adam
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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If your question is of interest to others as well, please add an entry to the Wiki!

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___________________________________________________________________________________

Re: NotoColorEmoji - loca table not found

[Adam Reviczky]

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Thanks Jairo,

That indeed works, should've read that it is bitmap only.

I do get a white background though (MKIV), is that how the bitmap is stored?

\definefontfeature[Emoji][default][sbix=yes]

\starttext

\framed[background=color,background=black]{\definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D}

\stoptext


In Hans' example for applecoloremoji there is no white background (page 5,
bachotex-2017-emoji.pdf).

I also do not get a white background with LibreOfiice.


Adam

On Fri, May 14, 2021 at 12:51 AM Jairo A. del Rio <jairoadelrio6@gmail.com>
wrote:

> In ConTeXt LMTX this works just fine (try mtxrun --generate and context
> --make first):
>
> \definefontfeature[Emoji][default][sbix=yes]
>
> \starttext
>
> \definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D
>
> \stoptext
>
> However, when one tries to convert it with ImageMagick the following
> happens:
>
>    **** Error reading a content stream. The page may be incomplete.
>                Output may be incorrect.
>    **** Error: Ignoring spurious ET operator.
>                Output may be incorrect.
>    **** Error: File did not complete the page properly and may be damaged.
>                Output may be incorrect.
>
>
> Only SVG fonts don't trigger this error in LMTX.
>
>
> I confirm ConTeXt MkIV is having issues with emoji fonts. It seems that
> GraphicsMagick is not properly generating images as it complains about an
> improper header.
>
> Jairo
>
> El jue, 13 de may. de 2021 a la(s) 18:26, Adam Reviczky (
> reviczky@gmail.com) escribió:
>
>> Hi,
>>
>> I am trying to use the 'handshake' character (
>> https://www.fileformat.info/info/unicode/char/1f91d/fontsupport.htm)
>> from the Noto Color Emoji font (
>> https://github.com/googlefonts/noto-emoji/blob/main/fonts/NotoColorEmoji.ttf
>> ).
>>
>> The following MWE gives an error:
>>
>> \starttext
>>
>> \definedfont[file:NotoColorEmoji.ttf] \char"1F91D
>>
>> \stoptext
>>
>> fonts           > otf loading > loading 'NotoColorEmoji.ttf', hash
>> 'notocoloremoji'
>> system          > lua > compiling
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
>> into
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
>> system          > lua > dumping
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
>> into
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
>> stripped
>> fonts           > otf loading > loading done
>> fonts           > otf loading > saving 'NotoColorEmoji.ttf' in cache
>> system          > lua > compiling
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
>> into
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
>> system          > lua > dumping
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
>> into
>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
>> stripped
>> fonts           > otf loading > loading, optimizing, packing and caching
>> time 2.557
>> pages           > flushing realpage 1, userpage 1, subpage 1
>> close source    > level 2, order 3, name '/tmp/MWE.tex'
>> close source    > level 1, order 3, name
>> '/usr/share/texmf/tex/context/base/mkiv/cont-yes.mkiv'
>> ! error:  (file NotoColorEmoji.ttf) (ttf): loca table not
>> foundmtx-context     | fatal error: return code: 256
>>
>> Any idea what is wrong?
>>
>> Adam
>>
>>
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to
>> the Wiki!
>>
>> maillist : ntg-context@ntg.nl /
>> http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>> wiki     : http://contextgarden.net
>>
>> ___________________________________________________________________________________
>>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: NotoColorEmoji - loca table not found

[Jairo A. del Rio]

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El jue, 13 de may. de 2021 a la(s) 19:52, Adam Reviczky (reviczky@gmail.com)
escribió:

> Thanks Jairo,
>
> That indeed works, should've read that it is bitmap only.
>
> I do get a white background though (MKIV), is that how the bitmap is
> stored?
>
>
In LuaLaTeX with Harfbuzz shaper as well as ConTeXt LMTX, transparency is
properly handled, so I suppose ConTeXt MkIV is to blame in this case. In
case you understand how does ConTeXt handle with bitmap fonts, relevant
files are under
/home/coragyps/lmtx/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/fonts/


> \definefontfeature[Emoji][default][sbix=yes]
>
> \starttext
>
>
> \framed[background=color,background=black]{\definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D}
>
> \stoptext
>
>
> In Hans' example for applecoloremoji there is no white background (page 5,
> bachotex-2017-emoji.pdf).
>
> I also do not get a white background with LibreOfiice.
>
>
>
I'd wait for Hans to fix it, as I don't really understand font management
in ConTeXt...

Jairo


> Adam
>
> On Fri, May 14, 2021 at 12:51 AM Jairo A. del Rio <jairoadelrio6@gmail.com>
> wrote:
>
>> In ConTeXt LMTX this works just fine (try mtxrun --generate and context
>> --make first):
>>
>> \definefontfeature[Emoji][default][sbix=yes]
>>
>> \starttext
>>
>> \definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D
>>
>> \stoptext
>>
>> However, when one tries to convert it with ImageMagick the following
>> happens:
>>
>>    **** Error reading a content stream. The page may be incomplete.
>>                Output may be incorrect.
>>    **** Error: Ignoring spurious ET operator.
>>                Output may be incorrect.
>>    **** Error: File did not complete the page properly and may be damaged.
>>                Output may be incorrect.
>>
>>
>> Only SVG fonts don't trigger this error in LMTX.
>>
>>
>> I confirm ConTeXt MkIV is having issues with emoji fonts. It seems that
>> GraphicsMagick is not properly generating images as it complains about an
>> improper header.
>>
>> Jairo
>>
>> El jue, 13 de may. de 2021 a la(s) 18:26, Adam Reviczky (
>> reviczky@gmail.com) escribió:
>>
>>> Hi,
>>>
>>> I am trying to use the 'handshake' character (
>>> https://www.fileformat.info/info/unicode/char/1f91d/fontsupport.htm)
>>> from the Noto Color Emoji font (
>>> https://github.com/googlefonts/noto-emoji/blob/main/fonts/NotoColorEmoji.ttf
>>> ).
>>>
>>> The following MWE gives an error:
>>>
>>> \starttext
>>>
>>> \definedfont[file:NotoColorEmoji.ttf] \char"1F91D
>>>
>>> \stoptext
>>>
>>> fonts           > otf loading > loading 'NotoColorEmoji.ttf', hash
>>> 'notocoloremoji'
>>> system          > lua > compiling
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
>>> into
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
>>> system          > lua > dumping
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tma'
>>> into
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/png/notocoloremoji.tmc'
>>> stripped
>>> fonts           > otf loading > loading done
>>> fonts           > otf loading > saving 'NotoColorEmoji.ttf' in cache
>>> system          > lua > compiling
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
>>> into
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
>>> system          > lua > dumping
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tma'
>>> into
>>> '/home/ubuntu/.texlive2020/texmf-var/luatex-cache/context/b47c3d3cee7cb6c86268d0595268c442/fonts/otl/notocoloremoji.tmc'
>>> stripped
>>> fonts           > otf loading > loading, optimizing, packing and caching
>>> time 2.557
>>> pages           > flushing realpage 1, userpage 1, subpage 1
>>> close source    > level 2, order 3, name '/tmp/MWE.tex'
>>> close source    > level 1, order 3, name
>>> '/usr/share/texmf/tex/context/base/mkiv/cont-yes.mkiv'
>>> ! error:  (file NotoColorEmoji.ttf) (ttf): loca table not
>>> foundmtx-context     | fatal error: return code: 256
>>>
>>> Any idea what is wrong?
>>>
>>> Adam
>>>
>>>
>>> ___________________________________________________________________________________
>>> If your question is of interest to others as well, please add an entry
>>> to the Wiki!
>>>
>>> maillist : ntg-context@ntg.nl /
>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>>> wiki     : http://contextgarden.net
>>>
>>> ___________________________________________________________________________________
>>>
>>
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to
>> the Wiki!
>>
>> maillist : ntg-context@ntg.nl /
>> http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>> wiki     : http://contextgarden.net
>>
>> ___________________________________________________________________________________
>>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: NotoColorEmoji - loca table not found

[Hans Hagen]

On 5/14/2021 1:26 AM, Adam Reviczky wrote:
> Hi,
> 
> I am trying to use the 'handshake' character 
> (https://www.fileformat.info/info/unicode/char/1f91d/fontsupport.htm 
> <https://www.fileformat.info/info/unicode/char/1f91d/fontsupport.htm>) 
> from the Noto Color Emoji font 
> (https://github.com/googlefonts/noto-emoji/blob/main/fonts/NotoColorEmoji.ttf 
> <https://github.com/googlefonts/noto-emoji/blob/main/fonts/NotoColorEmoji.ttf>).
> 
> The following MWE gives an error:
> 
> \starttext
> 
> \definedfont[file:NotoColorEmoji.ttf] \char"1F91D
> 
> \stoptext

works here (lmtx):

\starttext
     \definedfont[file:NotoColorEmoji.ttf*color]

     \emoji{handshake}
     \char"1F91D
\stoptext

two handhakes ... (you need to use the color feature, this font doesn't 
have non colored ones btw)

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: NotoColorEmoji - loca table not found

[Hans Hagen]

On 5/14/2021 1:49 AM, Jairo A. del Rio wrote:
> In ConTeXt LMTX this works just fine (try mtxrun --generate and context 
> --make first):
> 
> \definefontfeature[Emoji][default][sbix=yes]
> 
> \starttext
> 
> \definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D
> 
> \stoptext
> 
> However, when one tries to convert it with ImageMagick the following 
> happens:
> 
>     **** Error reading a content stream. The page may be incomplete.
>                 Output may be incorrect.
>     **** Error: Ignoring spurious ET operator.
>                 Output may be incorrect.
>     **** Error: File did not complete the page properly and may be damaged.
>                 Output may be incorrect.
> 
> 
> Only SVG fonts don't trigger this error in LMTX.
> 
> 
> I confirm ConTeXt MkIV is having issues with emoji fonts. It seems that 
> GraphicsMagick is not properly generating images as it complains about 
> an improper header.
my experiences with graphicmagick and such conversions are bad, one can 
also get pdf with missing objects and so ... when you have a version 
that works, best stick to that before updating (or keep it around)

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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Re: NotoColorEmoji - loca table not found

[Hans Hagen]

On 5/14/2021 3:21 AM, Jairo A. del Rio wrote:
> 
> 
> El jue, 13 de may. de 2021 a la(s) 19:52, Adam Reviczky 
> (reviczky@gmail.com <mailto:reviczky@gmail.com>) escribió:
> 
>     Thanks Jairo,
> 
>     That indeed works, should've read that it is bitmap only.
> 
>     I do get a white background though (MKIV), is that how the bitmap is
>     stored?
> 
> 
> In LuaLaTeX with Harfbuzz shaper as well as ConTeXt LMTX, transparency 
> is properly handled, so I suppose ConTeXt MkIV is to blame in this case. 
> In case you understand how does ConTeXt handle with bitmap fonts, 
> relevant files are under 
> /home/coragyps/lmtx/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/fonts/
> 
>     \definefontfeature[Emoji][default][sbix=yes]
> 
>     \starttext
> 
>     \framed[background=color,background=black]{\definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D}

took me quite a while to realize that there is an error in that line

>     \stoptext
> 
> 
>     In Hans' example for applecoloremoji there is no white background
>     (page 5, bachotex-2017-emoji.pdf).
> 
>     I also do not get a white background with LibreOfiice.
> 
> 
> 
> I'd wait for Hans to fix it, as I don't really understand font 
> management in ConTeXt...
in lmtx we use a different method

in mkiv we can actually switch to a variant that was on hold till 
texlive release (i.e. luatex 1.13, i forgot about that)

even then, because we cache the problem in mkiv is more with the 
conversion tools that drop masks ..

Hans



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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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Re: NotoColorEmoji - loca table not found

[Adam Reviczky]

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Hi Hans,

Yes, sorry about the error :).

Thanks for the explanation, will use lmtx for that, though probably best
just using another font (some mentioned on the list
https://www.mail-archive.com/ntg-context@ntg.nl/msg92800.html and
https://mailman.ntg.nl/pipermail/ntg-context/2020/098136.html) or svg or
metapost as I do not need it in colour.

I thought it would be easier via fonts but backtracking on the idea now and
maybe using something like this instead:
https://thenounproject.com/term/handshake/153516/.

Thank you,
Adam

On Fri, May 14, 2021 at 4:33 PM Hans Hagen <j.hagen@xs4all.nl> wrote:

> On 5/14/2021 3:21 AM, Jairo A. del Rio wrote:
> >
> >
> > El jue, 13 de may. de 2021 a la(s) 19:52, Adam Reviczky
> > (reviczky@gmail.com <mailto:reviczky@gmail.com>) escribió:
> >
> >     Thanks Jairo,
> >
> >     That indeed works, should've read that it is bitmap only.
> >
> >     I do get a white background though (MKIV), is that how the bitmap is
> >     stored?
> >
> >
> > In LuaLaTeX with Harfbuzz shaper as well as ConTeXt LMTX, transparency
> > is properly handled, so I suppose ConTeXt MkIV is to blame in this case.
> > In case you understand how does ConTeXt handle with bitmap fonts,
> > relevant files are under
> >
> /home/coragyps/lmtx/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/fonts/
> >
> >     \definefontfeature[Emoji][default][sbix=yes]
> >
> >     \starttext
> >
> >
>  \framed[background=color,background=black]{\definedfont[file:NotoColorEmoji.ttf*Emoji]\char"1F91D}
>
> took me quite a while to realize that there is an error in that line
>
> >     \stoptext
> >
> >
> >     In Hans' example for applecoloremoji there is no white background
> >     (page 5, bachotex-2017-emoji.pdf).
> >
> >     I also do not get a white background with LibreOfiice.
> >
> >
> >
> > I'd wait for Hans to fix it, as I don't really understand font
> > management in ConTeXt...
> in lmtx we use a different method
>
> in mkiv we can actually switch to a variant that was on hold till
> texlive release (i.e. luatex 1.13, i forgot about that)
>
> even then, because we cache the problem in mkiv is more with the
> conversion tools that drop masks ..
>
> Hans
>
>
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
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>
> ___________________________________________________________________________________
>

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Re: NotoColorEmoji - loca table not found

[Hans Hagen]

On 5/14/2021 6:33 PM, Adam Reviczky wrote:
> Hi Hans,
> 
> Yes, sorry about the error :).
> 
> Thanks for the explanation, will use lmtx for that, though probably best 
> just using another font (some mentioned on the list 
> https://www.mail-archive.com/ntg-context@ntg.nl/msg92800.html 
> <https://www.mail-archive.com/ntg-context@ntg.nl/msg92800.html> and 
> https://mailman.ntg.nl/pipermail/ntg-context/2020/098136.html 
> <https://mailman.ntg.nl/pipermail/ntg-context/2020/098136.html>) or svg 
> or metapost as I do not need it in colour.

I spend quite a bit of time looking into this (it's already a while ago 
when I implemented all this and color stuff in otf is a bit of a mess 
and evolving, so in retrospect it's probably better to wait a few years 
to see how that works out; the same for variable fonts ... hadr to deal 
with when there are not many fonts and fuzzy specs.)

Anyway, the problem is this: these png emoji are using palettes + masks 
and that combinaiton gives:

- with gm (gs) : white background
- with mutool  : black background
- with luatex  : a mess
- with lmtx    : what we want

now, testing all this takes a lot of time in mkiv because building the 
cache file takes time, so it's one of these moments i wonder if a modern 
machine would do better than my old but reliable machine. The outcome is 
that in mkiv one can do this:

\enabledirectives[backend.otfpng.method=lmtx]   % the real deal, slow
\enabledirectives[backend.otfpng.method=mutool] % black bg
\enabledirectives[backend.otfpng.method=gm]     % white bg, default

So, when you have a fast machine or a coffe break, you can use the lmtx 
method (can be configures in cont-loc.mkiv).

As manetioned, in lmtx it is done differently so no penalties there.

> I thought it would be easier via fonts but backtracking on the idea now 
> and maybe using something like this instead: 
> https://thenounproject.com/term/handshake/153516/ 
> <https://thenounproject.com/term/handshake/153516/>.
btw, some emoji fonts have both bw outlines and bitmap color, some use 
png (bloated), and microsoft fonts have efficient outline color (nice 
mechanism).

Hans

(who never uses emoji)


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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