Re: Floating point in pango

[Behdad Esfahbod <behdad behdad org>]

On Wed, 2006-07-12 at 10:37 +0200, Murray Cumming wrote:
> > On Wed, 2006-07-12 at 08:47 +0200, Murray Cumming wrote:
> >> > Hi;
> >> >
> >> > On Tue, 2006-07-11 at 12:04 +0300, Jorn Baayen wrote:
> >> >> >
> >> >> > True.  That's because cairo's public API uses floating point.  Do
> >> you
> >> >> > have any idea how Pango can do better here?
> >> >>
> >> >> No :(
> >> >>
> >> >
> >> > Neither that nice but;
> >> >
> >> >  - Have cairo expose a new alternate fixed point API that pango-cairo
> >> >    makes use of ( openGL API does a similar thing ). Internally cairo
> >> >    is mostly fixed point I believe.
> >>
> >> Is this something that we can do with just a typedef?
> >
> > Not without a C++ compiler.
> 
> I'm not sure I understand. I'm not talking about a template.

I didn't have templates in mind either.  Just a class with casts and
overloaded operators.


> For instance, exactly what functions are we talking about in the API?

I was not just talking about the API.  The API is easy: it uses double.
So you can just typedef to whatever else, or #define it.  The hard part
is the implementation, and that's what I was suggesting.


> >  But that may be feasible still.  We use
> > floats like others do, add, multiply, sin(), cos(), and add & multiply
> > won't work straight on fixed.
> 
> So this is more than just API, but I guess it can still be adapted.


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behdad
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