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Re: Release timelines and Unicode2 branch

From: Steven Tamm
Subject: Re: Release timelines and Unicode2 branch
Date: Wed, 21 Sep 2005 23:03:02 -0700

Sorry to jump in late,
Emacs.app is the name of the bundle that contains the app. On Mac OS X Finder and throughout the graphical interface the name appears as "Emacs". Any build of emacs that is meant to be run from the Mac graphical interface should be called "Emacs".

Aqua = Name of the look and field of the Mac OS X windowing system. It is a description of the Theme of the Mac OS X. Carbon = Name of the C interface to the Mac OS X windowing system. Based on Mac OS 9 APIs. Cocoa = Name of the ObjC interface to the Mac OS X windowing system. Based on Next/OpenStep. For the most part compatible with GNUStep. The incompatibilities are minor and mostly have to do with image rendering and font handling.

The name "emacs on aqua" is misleading and bad for technical reasons (it's like saying Emacs for Clearlooks).

The default build on mainline for Mac OS X is referred to as "Carbon" as distinct from the "X11" build. But it's still "Emacs", as would a build based on GNUStep compiled under Cocoa.

As for the unicode branch, the way that unicode font handling is done on the Mac (ATSUI) is different from the old-style (Quickdraw) that is used in the Carbon port. Quickdraw is based on MBTE and converting it to unicode is hard. I've done some work on rewriting the text rendering to use ATSUI, but I ran into some performance problems due to the way that fonts and styles are handled in ATSUI . It would be easier to port a GNUStep based version to use utf8 in an efficient manner based on NSLayoutManager: but any GNUStep based version of Emacs will suffer from some pretty tricky threading issues due to Apple's strange implementation of menu handling. It took a lot of effort to figure it out with Carbon. Also, maintaining backwards compatibility of font spec's is nigh impossible. But I haven't looked at the cocoa port of emacs in forever.


On Sep 20, 2005, at 11:43 PM, Richard M. Stallman wrote:

"Emacs.app" is a good name.  Mac users will recognize its relevance,
but it doesn't publicize Macintosh otherwise.

So let's use that.

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