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freetype2
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Code Issues 4 Releases Wiki Activity

Fixing the fixes :-) More formatting.

This commit is contained in:
Werner Lemberg 2000-05-29 22:40:57 +00:00
parent 4f99c3c423
commit c3c344c76e
1 changed files with 41 additions and 29 deletions
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70
src/base/ftcalc.c
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@ -64,7 +64,7 @@
/* */ /* */
/* <Description> */ /* <Description> */
/* Computes the square root of an Int32 integer (which will be */ /* Computes the square root of an Int32 integer (which will be */
/* as an unsigned long value). */ /* handled as an unsigned long value). */
/* */ /* */
/* <Input> */ /* <Input> */
/* x :: The value to compute the root for. */ /* x :: The value to compute the root for. */
@ -132,13 +132,14 @@
{ {
FT_Int s; FT_Int s;
s = 1; s = 1;
if ( a < 0 ) { a = -a; s = -s; } if ( a < 0 ) { a = -a; s = -s; }
if ( b < 0 ) { b = -b; s = -s; } if ( b < 0 ) { b = -b; s = -s; }
if ( c < 0 ) { c = -c; s = -s; } if ( c < 0 ) { c = -c; s = -s; }
return s * ( c > 0 ? ( ( (FT_Int64)a * b + ( c >> 1 ) ) / c ) return s * ( c > 0 ? ( (FT_Int64)a * b + ( c >> 1 ) ) / c
: 0x7FFFFFFF ); : 0x7FFFFFFFL );
} }
@ -174,7 +175,7 @@
FT_EXPORT_FUNC( FT_Long ) FT_MulFix( FT_Long a, FT_EXPORT_FUNC( FT_Long ) FT_MulFix( FT_Long a,
FT_Long b ) FT_Long b )
{ {
FT_Int s; FT_Int s;
s = 1; s = 1;
@ -219,11 +220,11 @@
s ^= b; b = ABS(b); s ^= b; b = ABS(b);
if ( b == 0 ) if ( b == 0 )
/* check for divide by 0 */ /* check for division by 0 */
q = 0x7FFFFFFFL; q = 0x7FFFFFFFL;
else else
/* compute result directly */ /* compute result directly */
q = ((FT_Int64)a << 16) / b; q = ( (FT_Int64)a << 16 ) / b;
return (FT_Int32)( s < 0 ? -q : q ); return (FT_Int32)( s < 0 ? -q : q );
} }
@ -277,9 +278,9 @@
do do
{ {
s = r; s = r;
r = ( r + l/r ) >> 1; r = ( r + l / r ) >> 1;
} }
while ( r > s || r*r > l ); while ( r > s || r * r > l );
return r; return r;
} }
@ -344,22 +345,23 @@
s ^= b; b = ABS( b ); s ^= b; b = ABS( b );
s ^= c; c = ABS( c ); s ^= c; c = ABS( c );
if ( a <= 46340 && b <= 46340 && c <= 176095L && c > 0) if ( a <= 46340 && b <= 46340 && c <= 176095L && c > 0 )
{ {
a = a*b + (c >> 1) ) / c; a = ( a * b + ( c >> 1 ) ) / c;
} }
else if (c > 0) else if ( c > 0 )
{ {
FT_Int64 temp, temp2; FT_Int64 temp, temp2;
FT_MulTo64( a, b, &temp ); FT_MulTo64( a, b, &temp );
temp2.hi = (FT_Int32)(c >> 31); temp2.hi = (FT_Int32)( c >> 31 );
temp2.lo = (FT_Word32)(c / 2); temp2.lo = (FT_Word32)( c / 2 );
FT_Add64( &temp, &temp2, &temp ); FT_Add64( &temp, &temp2, &temp );
a = FT_Div64by32( &temp, c ); a = FT_Div64by32( &temp, c );
} }
else else
a = 0x7FFFFFFF; a = 0x7FFFFFFFL;
return ( s < 0 ) ? -a : a; return ( s < 0 ) ? -a : a;
} }
@ -414,14 +416,16 @@
if ( ua <= 2048 && ub <= 1048576L ) if ( ua <= 2048 && ub <= 1048576L )
{ {
ua = ( ua*ub + 0x8000 ) >> 16; ua = ( ua * ub + 0x8000 ) >> 16;
} }
else else
{ {
FT_ULong al = ua & 0xFFFF; FT_ULong al = ua & 0xFFFF;
ua = (ua >> 16)*ub + al*(ub >> 16) + ( al*(ub & 0xFFFF) >> 16 ); ua = ( ua >> 16 ) * ub +
al * ( ub >> 16 ) +
( al * ( ub & 0xFFFF ) >> 16 );
} }
return ( s < 0 ? -(FT_Long)ua : ua ); return ( s < 0 ? -(FT_Long)ua : ua );
@ -447,7 +451,7 @@
/* The result of `(a*0x10000)/b'. */ /* The result of `(a*0x10000)/b'. */
/* */ /* */
/* <Note> */ /* <Note> */
/* The optimization for FT_DivFix() is simple: If (a << 16) fits in */ /* The optimization for FT_DivFix() is simple: If (a << 16) fits into */
/* 32 bits, then the division is computed directly. Otherwise, we */ /* 32 bits, then the division is computed directly. Otherwise, we */
/* use a specialized version of the old FT_MulDiv64(). */ /* use a specialized version of the old FT_MulDiv64(). */
/* */ /* */
@ -462,12 +466,14 @@
s ^= b; b = ABS(b); s ^= b; b = ABS(b);
if ( b == 0 ) if ( b == 0 )
/* check for divide by 0 */ {
/* check for division by 0 */
q = 0x7FFFFFFFL; q = 0x7FFFFFFFL;
else if ( (a >> 16) == 0 ) }
else if ( ( a >> 16 ) == 0 )
{ {
/* compute result directly */ /* compute result directly */
q = (FT_Word32)(a << 16) / (FT_Word32)b; q = (FT_Word32)( a << 16 ) / (FT_Word32)b;
} }
else else
{ {
@ -576,7 +582,7 @@
/* Check carry overflow of i1 + lo */ /* Check carry overflow of i1 + lo */
lo += i1; lo += i1;
hi += (lo < i1); hi += ( lo < i1 );
z->lo = lo; z->lo = lo;
z->hi = hi; z->hi = hi;
@ -615,6 +621,7 @@
FT_Int32 s; FT_Int32 s;
FT_Word32 q, r, i, lo; FT_Word32 q, r, i, lo;
s = x->hi; s = x->hi;
if ( s < 0 ) if ( s < 0 )
{ {
@ -626,8 +633,10 @@
/* Shortcut */ /* Shortcut */
if ( x->hi == 0 ) if ( x->hi == 0 )
{ {
if (y > 0) q = x->lo / y; if ( y > 0 )
else q = 0x7FFFFFFF; q = x->lo / y;
else
q = 0x7FFFFFFFL;
return ( s < 0 ) ? -(FT_Int32)q : (FT_Int32)q; return ( s < 0 ) ? -(FT_Int32)q : (FT_Int32)q;
} }
@ -637,8 +646,8 @@
if ( r >= (FT_Word32)y ) /* we know y is to be treated as unsigned here */ if ( r >= (FT_Word32)y ) /* we know y is to be treated as unsigned here */
return ( s < 0 ) ? 0x80000001L : 0x7FFFFFFFL; return ( s < 0 ) ? 0x80000001L : 0x7FFFFFFFL;
/* Return Max/Min Int32 if divide overflow. */ /* Return Max/Min Int32 if division overflow. */
/* This includes division by zero! */ /* This includes division by zero! */
q = 0; q = 0;
for ( i = 0; i < 32; i++ ) for ( i = 0; i < 32; i++ )
{ {
@ -678,6 +687,7 @@
z->hi = hi; z->hi = hi;
} }
static static
int ft_order64( FT_Int64* z ) int ft_order64( FT_Int64* z )
{ {
@ -701,6 +711,7 @@
return j - 1; return j - 1;
} }
/*************************************************************************/ /*************************************************************************/
/* */ /* */
/* <Function> */ /* <Function> */
@ -723,18 +734,19 @@
FT_Int32 r, s; FT_Int32 r, s;
if ( (FT_Int32)l->hi < 0 || if ( (FT_Int32)l->hi < 0 ||
(l->hi == 0 && l->lo == 0) ) ( l->hi == 0 && l->lo == 0 ) )
return 0; return 0;
s = ft_order64( l ); s = ft_order64( l );
if ( s == 0 ) return 1; if ( s == 0 )
return 1;
r = ft_square_roots[s]; r = ft_square_roots[s];
do do
{ {
s = r; s = r;
r = ( r + FT_Div64by32(l,r) ) >> 1; r = ( r + FT_Div64by32( l, r ) ) >> 1;
FT_MulTo64( r, r, &l2 ); FT_MulTo64( r, r, &l2 );
FT_Sub64 ( l, &l2, &l2 ); FT_Sub64 ( l, &l2, &l2 );
} }