[nvda] Re: BRLTTY and NVDA

On 30/10/2008 2:45 AM, Simon Eigeldinger wrote:

Why does NVDA use different tables than brltty? wouldn't it be better
to use brlttys tables instead using other tables?

There are several reasons for this:
* BRLTTY does not provide the ability to use contracted braille tables externally; the contracted tables can only be used internally. One reason for this is that using contracted tables requires that the client (NVDA) be provided with a map of input characters to output characters, which is a lot of extra work for BRLTTY. Even if it could, this would be very slow, as every translated string would have to be passed back and forth between BRLTTY and NVDA. * Given this fact, it doesn't make sense to use BRLTTY for text tables and something else for contracted tables. Therefore, I made the decision to simply communicate dots to BRLTTY and use liblouis for all braille translation. * This also means we do not depend on BRLTTY. BRLTTY is one method of communicating with a braille display, but it is not the only one. NVDA's Freedom Scientific and Handy Tech drivers, for example, do not use BRLTTY at all. 

Jamie

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