From: Antoine Leca (Antoine10646@leca-marti.org)
Date: Mon Mar 29 2004 - 06:13:30 EST
On Sunday, March 28, 2004 12:03 AM, James Kass wrote:
> So, if the question is how to make an OpenType font *not* display the
> dotted circle on Windows with Uniscribe, one idea would be to add a
> spacing glyph to U+25CC (DOTTED CIRCLE) in the font.
If you do so, you will end with defeating the normal behaviour that is to
draw a circle when someone makes an error while typing. Depending on the
intent of the font, it may or may not be a good idea.
Since Avarangal seems to be now under "non disclosure agreement" with
Microsoft, we do not know for sure what is his intent.
We also do not know if there are variations between releases (I hear there
are, but do not feel it is my job to investigate it), or generally what are
the real specifications in this area (the official being that the sequence
SP+ZWJ+some_mark renders without displaying the circle, but we know it is
not always enforced).
In the general case of a font intended for general use, and if the rendering
without the circle is intended in special cases like drawing a keyboard
layout for reference, I still believe it is better to have the circle and
resort to special manipulations, like SP+ZWJ+vowel or drawing directly with
ExtTextOut(ETO_GLYPH_INDEX), in order to draw the keyboard layout. At least,
because complexing a font to cure a defect into a version of one (the)
rendering engine does not seem to me an engineering solution. (I since read
your other post that rather seems to agree with me)
> Another approach is to simply use a non-OpenType Unicode TrueType
> font for Tamil. The dotted circles don't seem to ever appear unless the
> font-in-use has OpenType tables covering the script-in-use.
Right. (The only remaining problem will then be the overhang and centering).
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