Re: Industry Thai Cell-Clustering Rules

[Chookij Vanatham <chookij vanatham eng sun com>]

Hi Robert, Owen,
 
] On Fri, 3 Nov 2000, Chookij Vanatham wrote:
] 
] > ] Can't those be detected somehow ? (it would be interesting to have the
] > ] list of combinations and the codepoints assigned to the precombined 
glyphs)
] > 
] > Not quite sure about the question, give me more detail.
] 
] Pango shapers can "probe" fonts to see if they have certain glyphs.
] 
] They can also do y adjustments on glyphs.  It would be quite easy I guess
] to make a Thai renderer that could do nicely positioned vowels without
] needed extra glyphs for vowel-at-different-heights.
] 
] > Now, if users want to have Thai displayed as Wtt2.0 Cell-clustering,
] > what will you do ?
] 
] We have 
] 
]   if (user_asked_for_wtt2_on_all_thai_fonts()) 
]     {
]        use_wtt2();
]     }
]   else
]     {
]        dont_use_wtt2();
]     }
] 
] > That's why, we put Cell-clustering to XLFD name, so that, the engine
] > can determine which cell-clustering rule should be used. Then, users
] > would be able to choose what they want.
] 
This alternative is ok for me too.
Then, user_asked_for_wtt2_on_all_thai_fonts(), would be something,
may be, checking form Environment Variable, like, WTT_CELL_CLUSTERING, etc.

% setenv WTT_CELL_CLUSTERING True

Then, Thai pango engine will be able to pick up use_wtt2().

I think, this is the good option too.


] To put it bluntly, that is mad.

Well!!!, let me make sure that this isn't my idea to have it
at the beginning. :)


] 
] The correct way to have a user-configuration option is to have a
] user-configuration option, not to kludge it by abusing the XLFD.

Now, we have 2 options, either user-configuration or XLFD.

Hmm!!! May be, we need to think more. :)


Chookij V.


] 
] -- 
] Robert Brady
] robert suse co uk
] 
] 
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