On Mon, 21 Oct 2013 01:41:12 +0200 Philippe Verdy <[email protected]> wrote:
> Is there standard way in Unicode to specify tht one wants to display > a combining > mark in isolation ? Unicode recommends U+00A0 NO-BREAK SPACE as the base character for combining marks to be displayed in isolation. I believe the sequence <U+00A0, U+200D ZERO WIDTH JOINER> may actually be required by Uniscribe, but I could have it wrong. > 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). This feature seems excessive. There should already be lookups to deal with bases that are too narrow, e.g. a sanserif 'i'. Richard.
