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[base] Remove truncation in `FT_DivFix'. 

* src/base/ftcalc.c (FT_DivFix): Updated.
This commit is contained in:
Alexei Podtelezhnikov 2014-08-18 23:16:15 -04:00
parent 5ef2023c45
commit 382f3155f6
2 changed files with 19 additions and 14 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2014-08-18 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] Remove truncation in `FT_DivFix'.
* src/base/ftcalc.c (FT_DivFix): Updated.
2014-08-14 Alexei Podtelezhnikov <apodtele@gmail.com>
Minor refactoring.

27
src/base/ftcalc.c
View File

@ -247,11 +247,10 @@
FT_DivFix( FT_Long a,
FT_Long b )
{
FT_Int32 s;
FT_UInt32 q;
FT_Int s = 1;
FT_Long q;
s = 1;
if ( a < 0 )
{
a = -a;
@ -268,9 +267,9 @@
q = 0x7FFFFFFFL;
else
/* compute result directly */
q = (FT_UInt32)( ( ( (FT_UInt64)a << 16 ) + ( b >> 1 ) ) / b );
q = (FT_Long)( ( ( (FT_UInt64)a << 16 ) + ( b >> 1 ) ) / b );
return ( s < 0 ? -(FT_Long)q : (FT_Long)q );
return ( s < 0 ? -q : q );
}
@ -564,23 +563,23 @@
FT_DivFix( FT_Long a,
FT_Long b )
{
FT_Int32 s;
FT_UInt32 q;
FT_Long s;
FT_Long q;
/* XXX: this function does not allow 64-bit arguments */
s = (FT_Int32)a; a = FT_ABS( a );
s ^= (FT_Int32)b; b = FT_ABS( b );
s = a; a = FT_ABS( a );
s ^= b; b = FT_ABS( b );
if ( (FT_UInt32)b == 0 )
if ( b == 0 )
{
/* check for division by 0 */
q = (FT_UInt32)0x7FFFFFFFL;
q = 0x7FFFFFFFL;
}
else if ( ( a >> 16 ) == 0 )
{
/* compute result directly */
q = (FT_UInt32)( ( (FT_ULong)a << 16 ) + ( b >> 1 ) ) / (FT_UInt32)b;
q = (FT_Long)( ( ( (FT_ULong)a << 16 ) + ( b >> 1 ) ) / b );
}
else
{
@ -593,10 +592,10 @@
temp2.hi = 0;
temp2.lo = (FT_UInt32)( b >> 1 );
FT_Add64( &temp, &temp2, &temp );
q = ft_div64by32( temp.hi, temp.lo, (FT_Int32)b );
q = (FT_Long)ft_div64by32( temp.hi, temp.lo, (FT_Int32)b );
}
return ( s < 0 ? -(FT_Int32)q : (FT_Int32)q );
return ( s < 0 ? -q : q );
}