Re: [ft] what's the mean of CEIL( x )?

[David Turner]

luoyi a écrit :
> sorry, but:
>
> #define CEIL( x )   ( ( (x) + 63 ) >> 6 )
>
> obviously doesn't do what the C language "ceil()" function do....
>
>   
if x is a fixed-point 26.6 number, the macro returns the smallest 
integer that is greater
or equal to it, so it's very comparable to ceil()

ex:

  x=240 corresponds to value 3.75 CEIL(240) => 4
  x=64   corresponds to value 1.0  CEIL(64) => 1
  x=32  corresponds to value 0.5   CEIL(32) => 1
  x =1   corresponds to value 0.015625   CEIL(1) => 1
  x = 0  corresponds to value 0.  CEIL(0) => 0
  x = -1 corresponds to value -0.015625   CEIL(-1) => 0
  x = -32 corresponds to value -0.5  CEIL(-32) => 0
  x = -64 corresponds to value -1.  CEIL(-64) => -1

etc...

Regards,

- David Turner
- The FreeType Project  (www.freetype.org)

> "Peter Montgomery" <address@hidden> ??????:address@hidden
>   
> > luoyi,
> >
> > Looks like the fixed point (26.6) version of the C language "ceil( )" 
> > function.  Here's a page if you're not familiar with it.
> >
> > http://www.cplusplus.com/ref/cmath/ceil.html
> >
> >     
>
>
>
>
>
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>
>   


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