On 07/02/2002 10:41:24 AM "John H. Jenkins" wrote:
[I've been out of the loop for the past couple of weeks -- just now catching up on this.] >Alas, but that's technically impossible. Both OT and AAT (I'm not sure >about Graphite) require that single characters map to single glyphs, which >are then processed. (In OT, of course, you are also supposed to do some >preprocessing in character space, but that doesn't solve this problem.) >It would be nice to have a cmap format which maps multiple characters to >single glyphs initially. > >The way we deal with this is to have the ligatures with the ZWJ inserted >as part of a ligature table which is on by default and which isn't >revealed to the UI so that the user can't turn them off. In Graphite, character sequences get mapped into glyph sequences one-to-one via the cmap, just as in OT and AAT. From that point, what happens and what can happen is completely at the discretion of the font developer. They can decide to always form certain ligatures, always form some ligatures but make others dependent upon ZWJ, or they may make some/all dependent upon a user-selected font feature (assumes the software exposes an UI for selecting the features that the font supports). Of course, nothing happens unless the font developer included rules that make it happen. - Peter --------------------------------------------------------------------------- Peter Constable Non-Roman Script Initiative, SIL International 7500 W. Camp Wisdom Rd., Dallas, TX 75236, USA Tel: +1 972 708 7485 E-mail: <[EMAIL PROTECTED]>
