luoyi a écrit :
sorry, maybe I misunderstand what is "fixed-point 26.6 number".....
can you explain it ?
it means that the value of X can be seen as a 26-bit integer, followed
by a 6-bit
fractional part. As in the following graphics:
+----------------------------------+-----------+
| integer mantissa | fraction |
+----------------------------------+-----------+
26 bits 6 bits
In other words:
float_value(x) = (x >> 6) + (x & 63)/64.0
round(x) = (x+32) & ~63
floor(x) = x & ~63
ceil(x) = (x+63) & ~63
int(x) = (x >> 6)
the macro CEIL(x) as defined really returns int(ceil(x))
note that int(x) is (x >> 6) and *not* x/64.0 !!
Hope this helps,
- David Turner
- The FreeType Project (www.freetype.org)
"David Turner" <[EMAIL PROTECTED]> ??????:[EMAIL PROTECTED]
x=240 corresponds to value 3.75 CEIL(240) => 4
240 / 26.6 = 9.022
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