Is there standard way in Unicode to specify tht one wants to display a combining mark in isolation ? Which leading charcter should be used (that should not display by itself but would force the separation from the previaous context) which can also act as valid leader in combining sequences, and would resist to bidi reordering (it should be neutral), and have null collation by itself ?
Then it would be discarded by renderers, and it would know tht the combining mark must appear with its "ill-form", i.e. it would activate the lookup of U+25CC (in legcy fonts) or the new feature tht will select the a ppropriate form with its best default placeholder with the best metrics ? I would suggest a name for this OpenType feature "ilfm" (for ill-formed marks), distinct from "isol" already used for isolated base letters. This feature would map combining mrks (or ranges of combining marks) directly to the approprite glyph (possibly built as a composite glyph using common base glyph and the glyph of the combining mark itself with correct positioning). 2013/10/21 Andrew Cunningham <[email protected]> > I suspect it is a font issue, rather than a renderer issue, but then using > a dotted circle is a convention used in the unicode charts and in the > unicode spec. It is not a combination I'd expect a font developer from SE > Asia to necessarily support. > > Since publications in SE Asia have their own typographic conventions for > displaying isolated combining marks. > > Andrew >
