commit (head): bidi work

From: Tomas Frydrych (tomasfrydrych_at_yahoo.co.uk)
Date: Fri Apr 23 2004 - 11:37:04 EDT

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Some refactoring of bidi code: we now access the fribidi library via
a handful of UT_bidi*() functions defined in ut_string.h; in
addition, I have replaced the constants defined in fribidi.h with
UT_BIDI_ constants. This makes it relatively easy to remove the
fribidi dependency by reimplementing the UT_bidi*() functions in
platform code; I am considering doing this on win32 since the system
provides us with a native bidi API. These changes also makes it
possible to disable bidi processing by simply replacing the current
UT_bidi*() implementaitons with dummies.

This should not break anything, as the changes are mostly formal
changes of names.

files: quite a few

Tomas

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