A problem with combining characters

A problem with combining characters

[luigi scarso]

In this example \N{COMBINING CARON BELOW} looks bad -- a font problem ?

\usetypescript[libertine]
\setupbodyfont[libertine,rm,10pt]
\setupinterlinespace[line=2.6ex]

\starttext
%%echo '\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING
CARON BELOW}' |./uconv -t utf-8  -x "name-any
ạ̬
\stoptext


-- 
luigi
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___________________________________________________________________________________

Re: A problem with combining characters

[Khaled Hosny]

On Fri, Jul 02, 2010 at 05:57:01PM +0200, luigi scarso wrote:
> In this example \N{COMBINING CARON BELOW} looks bad -- a font problem ?
> 
> \usetypescript[libertine]
> \setupbodyfont[libertine,rm,10pt]
> \setupinterlinespace[line=2.6ex]
> 
> \starttext
> %%echo '\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING
> CARON BELOW}' |./uconv -t utf-8  -x "name-any
> ạ̬
> \stoptext

Tested with Pango, the two marks overlap, very likely to be a font issue
(no mark to mark anchor attachment). Looks good in DejaVu Sans (but not
Serif) BTW.


-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer
___________________________________________________________________________________
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___________________________________________________________________________________

Re: A problem with combining characters

[luigi scarso]

On Fri, Jul 2, 2010 at 6:33 PM, Khaled Hosny <khaledhosny@eglug.org> wrote:
> On Fri, Jul 02, 2010 at 05:57:01PM +0200, luigi scarso wrote:
>> In this example \N{COMBINING CARON BELOW} looks bad -- a font problem ?
>>
>> \usetypescript[libertine]
>> \setupbodyfont[libertine,rm,10pt]
>> \setupinterlinespace[line=2.6ex]
>>
>> \starttext
>> %%echo '\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING
>> CARON BELOW}' |./uconv -t utf-8  -x "name-any
>> ạ̬
>> \stoptext
>
> Tested with Pango, the two marks overlap, very likely to be a font issue
> (no mark to mark anchor attachment). Looks good in DejaVu Sans (but not
> Serif) BTW.
Libertine has not ccmp feature,
dejavusans yes

-- 
luigi
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___________________________________________________________________________________

Re: A problem with combining characters

[luigi scarso]

Also
\usemodule[s-fnt-10]
\setuppapersize[A3,landscape][A3,landscape]
\setupbodyfont[ss,12pt]
\setupinteraction[state=start]
\starttext
\completecontent
\chapter{dejavusansmono}
\ShowCompleteFont{name:dejavusansmono}{12pt}{1}
\chapter{dejavuserif}
\ShowCompleteFont{name:dejavuserif}{12pt}{1}
\chapter{libertine}
\ShowCompleteFont{name:libertine}{12pt}{1}
\stoptext

-- 
luigi
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: A problem with combining characters

[luigi scarso]

On Fri, Jul 2, 2010 at 5:57 PM, luigi scarso <luigi.scarso@gmail.com> wrote:
> In this example \N{COMBINING CARON BELOW} looks bad -- a font problem ?
>
> \usetypescript[libertine]
> \setupbodyfont[libertine,rm,10pt]
> \setupinterlinespace[line=2.6ex]
>
> \starttext
> %%echo '\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING
> CARON BELOW}' |./uconv -t utf-8  -x "name-any
> ạ̬
> \stoptext


Better in pure mkiv

\usetypescript[libertine]
\setupbodyfont[libertine,rm,10pt]
\setupinterlinespace[line=2.6ex]

\startluacode
function desc2utf8(desc)
    local us = ''
    local plane = 0
    for i,v in pairs(characters.data) do
      plane = i
      if v.description ==  desc then
       us = v.unicodeslot
       break
       end
    end
    return  tex.sprint(tex.ctxcatcodes,unicode.utf8.char(us))
end
\stopluacode
\def\N#1{\ctxlua{desc2utf8("#1")}}

\starttext
\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING CARON BELOW}
\stoptext


-- 
luigi
___________________________________________________________________________________
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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: A problem with combining characters

[luigi scarso]

On Fri, Jul 2, 2010 at 6:33 PM, Khaled Hosny <khaledhosny@eglug.org> wrote:
> On Fri, Jul 02, 2010 at 05:57:01PM +0200, luigi scarso wrote:
>> In this example \N{COMBINING CARON BELOW} looks bad -- a font problem ?
>>
>> \usetypescript[libertine]
>> \setupbodyfont[libertine,rm,10pt]
>> \setupinterlinespace[line=2.6ex]
>>
>> \starttext
>> %%echo '\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING
>> CARON BELOW}' |./uconv -t utf-8  -x "name-any
>> ạ̬
>> \stoptext
>
> Tested with Pango, the two marks overlap, very likely to be a font issue
> (no mark to mark anchor attachment). Looks good in DejaVu Sans (but not
> Serif) BTW.
Not here: the same problem of libertine.
Maybe I'm not using the right features ?

\pdfobjcompresslevel0
\pdfcompresslevel0
\unprotect


\definefontfeature[otftracker-dejavu]
    [language=dflt,mode=node,script=latn,ccmp=yes,kern=yes]

%aalt    Access All Alternates
%ccmp    Glyph Composition/Decomposition
%dlig    Discretionary Ligatures
%hlig    Historical Ligatures
%kern    Kerning
%liga    Standard Ligatures
%mark    Mark Positioning
%mkmk    Mark to Mark Positioning
%salt    Stylistic Alternates



\starttypescriptcollection[dejavu]
    \starttypescript [serif] [dejavu] [name]
        \setups[\s!font:\s!fallback:\s!serif]
        \definefontsynonym [\s!Serif]
[\s!file:DejaVuSerif.ttf]  [\s!features=otftracker-dejavu]
        \definefontsynonym [\s!SerifBold]
[\s!file:DejaVuSerif-Bold.ttf]  [\s!features=\s!default]
        \definefontsynonym [\s!SerifItalic]
[\s!file:DejaVuSerif-Italic.ttf] [\s!features=\s!default]
        \definefontsynonym [\s!SerifBoldItalic]
[\s!file:DejaVuSerif-BoldItalic.ttf] [\s!features=\s!default]
    \stoptypescript

    \starttypescript [sans] [dejavu] [name]
        \setups[\s!font:\s!fallback:\s!sans]
        \definefontsynonym [\s!Sans]
[\s!file:DejaVuSans.ttf]  [\s!features=otftracker-dejavu]
        \definefontsynonym [\s!SansBold]
[\s!file:DejaVuSans-Bold.ttf]  [\s!features=\s!default]
        \definefontsynonym [\s!SansItalic]
[\s!file:DejaVuSans-Oblique.ttf] [\s!features=\s!default]
        \definefontsynonym [\s!SansBoldItalic]
[\s!file:DejaVuSans-Oblique.ttf] [\s!features=\s!default]
    \stoptypescript
\stoptypescriptcollection
\protect


\starttypescript[dejavu]
    \definetypeface[dejavu][rm][serif][dejavu]
    \definetypeface[dejavu][ss][sans][dejavu]
\stoptypescript

\usetypescript[dejavu]
\setupbodyfont[dejavu,rm,18pt]
\setupinterlinespace[line=2.6ex]

\startluacode
function desc2utf8(desc)
  local us = ''
  local plane = 0
  for i,v in pairs(characters.data) do
   if v.description ==  desc then
     us = v.unicodeslot
     print(string.format("==> \%s u\%04x",desc,us))
     break
   end
  end
  return  tex.sprint(tex.ctxcatcodes,unicode.utf8.char(us))
end
\stopluacode
\def\N#1{\ctxlua{desc2utf8("#1")}}


\starttext
\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING CARON BELOW}
{\ss \N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING CARON
BELOW} }\\
\\
{\rm \N{LATIN SMALL LETTER N}\N{COMBINING TILDE}}%
{\ss \N{LATIN SMALL LETTER N}\N{COMBINING TILDE}}\\
%
{\rm \N{LATIN SMALL LETTER N WITH TILDE}}%
{\ss \N{LATIN SMALL LETTER N WITH TILDE}}
\stoptext



-- 
luigi
___________________________________________________________________________________
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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: A problem with combining characters

[luigi scarso]

On Mon, Jul 5, 2010 at 11:44 AM, luigi scarso <luigi.scarso@gmail.com> wrote:
> On Fri, Jul 2, 2010 at 6:33 PM, Khaled Hosny <khaledhosny@eglug.org> wrote:
>> On Fri, Jul 02, 2010 at 05:57:01PM +0200, luigi scarso wrote:
>>> In this example \N{COMBINING CARON BELOW} looks bad -- a font problem ?
>>>
>>> \usetypescript[libertine]
>>> \setupbodyfont[libertine,rm,10pt]
>>> \setupinterlinespace[line=2.6ex]
>>>
>>> \starttext
>>> %%echo '\N{LATIN SMALL LETTER A}\N{COMBINING DOT BELOW}\N{COMBINING
>>> CARON BELOW}' |./uconv -t utf-8  -x "name-any
>>> ạ̬
>>> \stoptext
>>
>> Tested with Pango, the two marks overlap, very likely to be a font issue
>> (no mark to mark anchor attachment). Looks good in DejaVu Sans (but not
>> Serif) BTW.
> Not here: the same problem of libertine.
> Maybe I'm not using the right features ?
Maybe  combine=yes
-- 
luigi
___________________________________________________________________________________
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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________