Date: Wed Jan 30 2008 - 04:56:45 CST
Quoting James Kass <email@example.com>:
> John Knightley wrote,
>> thank-you, GPOS certainly manages to centre the dots correctly-at
>> least in some applications.
>> U+0332 combining low line however needs to be half or full width
>> depending upon the width of the character it is combined with.
>> It would appear from comparng that Code2000 and SIL Doulos use some
>> other mechanism to produce stacking.
> Code2000 uses OpenType GPOS (glyph positioning) tables to stack diacritics
> and to reasonably place diacritics in relation to their base characters. The
> SIL Doulos font most probably uses the same method.
My apologies - I shoould rather say that Code2000 uses advanced GPOS
to produce stacking, and that I have not been able to do the same.
>> For some reason - the stacking feature, by mark to ligature does
>> not seem to work. This however maybe due to other factors.
> Can you post a graphic example of the notation you desire? It
> is said that a picture is worth a thousand words, and this might
> help us understand the desired behaviour.
The attached sample.png is simple example, and sample2.png slightly
more complicated. (I have added a few dots and lines, so that in a
few notes one can see main variations.)
Notes use the numbers 1 to 7; dots above or belowso a higher or lower
octave; a line below halves the duration of the note.
With half width numbers this is no problem.
> The fullwidth presentation forms of Latin characters (and western digits)
> may present an interesting problem. I'd have to check, but I'm pretty
> sure that I've made no allowances for any of them using GPOS and
> combining marks. I'm also not sure if a rendering engine will attempt
> to shape characters from that range, but it would make for an interesting
> test. (Even the ASCII digits -- I had not considered that anyone would need
> to put combining marks with them and so did not make any effort to
> assign what are called "anchor points" to them.)
> Best regards,
> James Kass
This message sent through Virus Free Email
This archive was generated by hypermail 2.1.5 : Wed Jan 30 2008 - 07:47:52 CST