diff options
Diffstat (limited to 'src/base/ftcalc.c')
| -rw-r--r-- | src/base/ftcalc.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/base/ftcalc.c b/src/base/ftcalc.c index 247ee034c..1201e3b56 100644 --- a/src/base/ftcalc.c +++ b/src/base/ftcalc.c @@ -496,6 +496,61 @@ /* documentation is in ftcalc.h */ + /* apparently, the second version of this code is not compiled correctly */ + /* on Mac machines with the MPW C compiler.. tsss, tsss, tss... */ +#if 1 + FT_EXPORT_DEF( FT_Int32 ) + FT_Div64by32( FT_Int64* x, + FT_Int32 y ) + { + FT_Int32 s; + FT_UInt32 q, r, i, lo; + + + s = x->hi; + if ( s < 0 ) + { + x->lo = (FT_UInt32)-(FT_Int32)x->lo; + x->hi = ~x->hi + !( x->lo ); + } + s ^= y; y = ABS( y ); + + /* Shortcut */ + if ( x->hi == 0 ) + { + if ( y > 0 ) + q = x->lo / y; + else + q = 0x7FFFFFFFL; + + return ( s < 0 ? -(FT_Int32)q : (FT_Int32)q ); + } + + r = x->hi; + lo = x->lo; + + if ( r >= (FT_UInt32)y ) /* we know y is to be treated as unsigned here */ + return ( s < 0 ? 0x80000001UL : 0x7FFFFFFFUL ); + /* Return Max/Min Int32 if division overflow. */ + /* This includes division by zero! */ + q = 0; + for ( i = 0; i < 32; i++ ) + { + r <<= 1; + q <<= 1; + r |= lo >> 31; + + if ( r >= (FT_UInt32)y ) + { + r -= y; + q |= 1; + } + lo <<= 1; + } + + return ( s < 0 ? -(FT_Int32)q : (FT_Int32)q ); + } +#else FT_EXPORT_DEF( FT_Int32 ) FT_Div64by32( FT_Int64* x, FT_Int32 y ) @@ -527,6 +582,7 @@ return ( s < 0 ? -(FT_Int32)q : (FT_Int32)q ); } +#endif #ifdef FT_CONFIG_OPTION_OLD_CALCS |