On 14-2-2010 17:06, Khaled Hosny wrote:
On Sun, Feb 14, 2010 at 02:42:30PM +0100, Hans Hagen wrote:
On 13-2-2010 18:32, Khaled Hosny wrote:
On Fri, Feb 12, 2010 at 07:21:14PM +0100, Hans Hagen wrote:
On 12-2-2010 19:03, Khaled Hosny wrote:
Is 'opbd' feature supported? According to the spec[1] this feature is
used to define what I think is equivalent to the protrusion values used
for optical alignment of the glyphs. I grepped the sources and there
seem no be special handling of it, I don't have fonts that use this
feature (I didn't look for one) but I'm planning to use it in my fonts
and thought I'd check if ConTeXt support it first.
This Typophile thread[2] might be interesting too.
If fonts are needed I can check for free fonts that implement this, or
prepare a font for testing.
[1] http://www.microsoft.com/typography/OTSPEC/features_ko.htm#opbd
[2] http://typophile.com/node/48738
Indeed I need a test font in order to see how it can be implemented.
If there are no fonts we should wonder what the exact spec is. Does
fontforge support it?
I found that the font "fxlbi.otf" (of libertine fonts) has both 'lfbd' and
'rtbd' (left/right optical bounds) but no 'opbd' feature. Now re-reading
the spec, I don't see what the values stored in 'opbd' is used for as
the application has to consult 'lfbd' or 'rtbd' feature according to the
position of the glyph in the line, I asked on OpenType mailing list but
I don't expect getting an answer (nobody implemented this feature, except
FontForge AFAIK.) My suggestion is to ignore 'opbd' completely and just
use the values from 'lfbd'/'rtbd' directly.
but are these [lr]fbd meant for protruding or for italic correction
They are meant for protruding, and per the spec should be applied
only at the start/end of line.
http://www.microsoft.com/typography/OTSPEC/features_ko.htm#lfbd
http://www.microsoft.com/typography/OTSPEC/features_pt.htm#rtbd
well, i decided to take a look at the font but it looks like something
else ... in that font only digits seem to have such values
Hans
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