[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [ft] Why is FT_F26Dot6 defined as a signed long
|
From: |
Werner LEMBERG |
|
Subject: |
Re: [ft] Why is FT_F26Dot6 defined as a signed long |
|
Date: |
Thu, 14 Feb 2019 06:45:29 +0100 (CET) |
> I'm curious why FT_F26Dot6 is a signed long and not a FT_Int32? I
> would have expected it to be a 32 bit fixed point value.
The library is quite old; at the time of its inception, `long' was
32bit on most platforms, and C types like `int32_t' didn't exist yet
(or were so new that just a very small set of compilers supported it
then).
On the other hand, using a 64bit entity has the advantage of tagging
an unsigned 32bit value as `not set', for example, by assigning
value -1 to it.
Werner