Hi all,
The following will roughly double the space of optimal calculations. Comments?
Alexei
diff --git a/src/base/ftcalc.c b/src/base/ftcalc.c
index 6e65583..baeb810 100644
--- a/src/base/ftcalc.c
+++ b/src/base/ftcalc.c
@@ -363,15 +363,15 @@
/* */
/* we compute 'a*b+c/2', then divide it by 'c'. (positive values) */
/* */
- /* 46340 is FLOOR(SQRT(2^31-1)). */
+ /* 46340 * 46341 approaches but does not exceed 2^31-1. */
/* */
- /* if ( a <= 46340 && b <= 46340 ) then ( a*b <= 0x7FFEA810 ) */
+ /* if ( a + b <= 92681 ) then ( a*b <= 0x7FFF5D14 ) */
/* */
- /* 0x7FFFFFFF - 0x7FFEA810 = 0x157F0 */
+ /* 0x7FFFFFFF - 0x7FFF5D14 = 0xA2EB */
/* */
- /* if ( c < 0x157F0*2 ) then ( a*b+c/2 <= 0x7FFFFFFF ) */
+ /* if ( c < 0xA2EB * 2 + 1 ) then ( a*b+c/2 <= 0x7FFFFFFF ) */
/* */
- /* and 2*0x157F0 = 176096 */
+ /* and 2*0xA2EB + 1 = 83415 */
/* */
FT_EXPORT_DEF( FT_Long )
@@ -390,7 +390,7 @@
s ^= b; b = FT_ABS( b );
s ^= c; c = FT_ABS( c );
- if ( a <= 46340L && b <= 46340L && c <= 176095L && c > 0 )
+ if ( a + b <= 92681L && c <= 83415L && c > 0 )
a = ( a * b + ( c >> 1 ) ) / c;
else if ( (FT_Int32)c > 0 )
@@ -427,7 +427,7 @@
s ^= b; b = FT_ABS( b );
s ^= c; c = FT_ABS( c );
- if ( a <= 46340L && b <= 46340L && c > 0 )
+ if ( a + b <= 92681L && c > 0 )
a = a * b / c;
else if ( (FT_Int32)c > 0 )