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Unified Diff: third_party/freetype/src/base/ftcalc.c

Issue 1413673003: Update bundled freetype to 2.6.1 (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: DEPS for corpus Created 5 years, 1 month ago
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Index: third_party/freetype/src/base/ftcalc.c
diff --git a/third_party/freetype/src/base/ftcalc.c b/third_party/freetype/src/base/ftcalc.c
index f3ef8c537ba1ba11e64abb60c2216af3319d6e24..619a08b3a0c3e2a2a60399b4579605b46ef37388 100644
--- a/third_party/freetype/src/base/ftcalc.c
+++ b/third_party/freetype/src/base/ftcalc.c
@@ -4,7 +4,7 @@
/* */
/* Arithmetic computations (body). */
/* */
-/* Copyright 1996-2006, 2008, 2012-2014 by */
+/* Copyright 1996-2015 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@@ -86,8 +86,7 @@
FT_EXPORT_DEF( FT_Fixed )
FT_RoundFix( FT_Fixed a )
{
- return ( a >= 0 ) ? ( a + 0x8000L ) & ~0xFFFFL
- : -((-a + 0x8000L ) & ~0xFFFFL );
+ return ( a + 0x8000L - ( a < 0 ) ) & ~0xFFFFL;
}
@@ -96,8 +95,7 @@
FT_EXPORT_DEF( FT_Fixed )
FT_CeilFix( FT_Fixed a )
{
- return ( a >= 0 ) ? ( a + 0xFFFFL ) & ~0xFFFFL
- : -((-a + 0xFFFFL ) & ~0xFFFFL );
+ return ( a + 0xFFFFL ) & ~0xFFFFL;
}
@@ -106,8 +104,7 @@
FT_EXPORT_DEF( FT_Fixed )
FT_FloorFix( FT_Fixed a )
{
- return ( a >= 0 ) ? a & ~0xFFFFL
- : -((-a) & ~0xFFFFL );
+ return a & ~0xFFFFL;
}
#ifndef FT_MSB
@@ -115,30 +112,31 @@
FT_BASE_DEF ( FT_Int )
FT_MSB( FT_UInt32 z )
{
- FT_Int shift = 0;
+ FT_Int shift = 0;
+
/* determine msb bit index in `shift' */
- if ( z & 0xFFFF0000U )
+ if ( z & 0xFFFF0000UL )
{
z >>= 16;
shift += 16;
}
- if ( z & 0x0000FF00U )
+ if ( z & 0x0000FF00UL )
{
z >>= 8;
shift += 8;
}
- if ( z & 0x000000F0U )
+ if ( z & 0x000000F0UL )
{
z >>= 4;
shift += 4;
}
- if ( z & 0x0000000CU )
+ if ( z & 0x0000000CUL )
{
z >>= 2;
shift += 2;
}
- if ( z & 0x00000002U )
+ if ( z & 0x00000002UL )
{
/* z >>= 1; */
shift += 1;
@@ -172,69 +170,77 @@
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Long )
- FT_MulDiv( FT_Long a,
- FT_Long b,
- FT_Long c )
+ FT_MulDiv( FT_Long a_,
+ FT_Long b_,
+ FT_Long c_ )
{
- FT_Int s = 1;
- FT_Long d;
+ FT_Int s = 1;
+ FT_UInt64 a, b, c, d;
+ FT_Long d_;
+
+
+ FT_MOVE_SIGN( a_, s );
+ FT_MOVE_SIGN( b_, s );
+ FT_MOVE_SIGN( c_, s );
+ a = (FT_UInt64)a_;
+ b = (FT_UInt64)b_;
+ c = (FT_UInt64)c_;
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
- FT_MOVE_SIGN( c, s );
+ d = c > 0 ? ( a * b + ( c >> 1 ) ) / c
+ : 0x7FFFFFFFUL;
- d = (FT_Long)( c > 0 ? ( (FT_Int64)a * b + ( c >> 1 ) ) / c
- : 0x7FFFFFFFL );
+ d_ = (FT_Long)d;
- return ( s > 0 ) ? d : -d;
+ return s < 0 ? -d_ : d_;
}
/* documentation is in ftcalc.h */
FT_BASE_DEF( FT_Long )
- FT_MulDiv_No_Round( FT_Long a,
- FT_Long b,
- FT_Long c )
+ FT_MulDiv_No_Round( FT_Long a_,
+ FT_Long b_,
+ FT_Long c_ )
{
- FT_Int s = 1;
- FT_Long d;
+ FT_Int s = 1;
+ FT_UInt64 a, b, c, d;
+ FT_Long d_;
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
- FT_MOVE_SIGN( c, s );
+ FT_MOVE_SIGN( a_, s );
+ FT_MOVE_SIGN( b_, s );
+ FT_MOVE_SIGN( c_, s );
- d = (FT_Long)( c > 0 ? (FT_Int64)a * b / c
- : 0x7FFFFFFFL );
+ a = (FT_UInt64)a_;
+ b = (FT_UInt64)b_;
+ c = (FT_UInt64)c_;
- return ( s > 0 ) ? d : -d;
+ d = c > 0 ? a * b / c
+ : 0x7FFFFFFFUL;
+
+ d_ = (FT_Long)d;
+
+ return s < 0 ? -d_ : d_;
}
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Long )
- FT_MulFix( FT_Long a,
- FT_Long b )
+ FT_MulFix( FT_Long a_,
+ FT_Long b_ )
{
#ifdef FT_MULFIX_ASSEMBLER
- return FT_MULFIX_ASSEMBLER( a, b );
+ return FT_MULFIX_ASSEMBLER( a_, b_ );
#else
- FT_Int s = 1;
- FT_Long c;
-
+ FT_Int64 ab = (FT_Int64)a_ * (FT_Int64)b_;
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
-
- c = (FT_Long)( ( (FT_Int64)a * b + 0x8000L ) >> 16 );
-
- return ( s > 0 ) ? c : -c;
+ /* this requires arithmetic right shift of signed numbers */
+ return (FT_Long)( ( ab + 0x8000L - ( ab < 0 ) ) >> 16 );
#endif /* FT_MULFIX_ASSEMBLER */
}
@@ -243,20 +249,26 @@
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Long )
- FT_DivFix( FT_Long a,
- FT_Long b )
+ FT_DivFix( FT_Long a_,
+ FT_Long b_ )
{
- FT_Int s = 1;
- FT_Long q;
+ FT_Int s = 1;
+ FT_UInt64 a, b, q;
+ FT_Long q_;
+
+ FT_MOVE_SIGN( a_, s );
+ FT_MOVE_SIGN( b_, s );
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
+ a = (FT_UInt64)a_;
+ b = (FT_UInt64)b_;
- q = (FT_Long)( b > 0 ? ( ( (FT_UInt64)a << 16 ) + ( b >> 1 ) ) / b
- : 0x7FFFFFFFL );
+ q = b > 0 ? ( ( a << 16 ) + ( b >> 1 ) ) / b
+ : 0x7FFFFFFFUL;
- return ( s < 0 ? -q : q );
+ q_ = (FT_Long)q;
+
+ return s < 0 ? -q_ : q_;
}
@@ -400,26 +412,29 @@
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Long )
- FT_MulDiv( FT_Long a,
- FT_Long b,
- FT_Long c )
+ FT_MulDiv( FT_Long a_,
+ FT_Long b_,
+ FT_Long c_ )
{
- FT_Int s = 1;
+ FT_Int s = 1;
+ FT_UInt32 a, b, c;
/* XXX: this function does not allow 64-bit arguments */
- if ( a == 0 || b == c )
- return a;
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
- FT_MOVE_SIGN( c, s );
+ FT_MOVE_SIGN( a_, s );
+ FT_MOVE_SIGN( b_, s );
+ FT_MOVE_SIGN( c_, s );
+
+ a = (FT_UInt32)a_;
+ b = (FT_UInt32)b_;
+ c = (FT_UInt32)c_;
if ( c == 0 )
- a = 0x7FFFFFFFL;
+ a = 0x7FFFFFFFUL;
- else if ( (FT_ULong)a + b <= 129894UL - ( c >> 17 ) )
- a = ( (FT_ULong)a * b + ( c >> 1 ) ) / c;
+ else if ( a + b <= 129894UL - ( c >> 17 ) )
+ a = ( a * b + ( c >> 1 ) ) / c;
else
{
@@ -438,30 +453,36 @@
: ft_div64by32( temp.hi, temp.lo, c );
}
- return ( s < 0 ? -a : a );
+ a_ = (FT_Long)a;
+
+ return s < 0 ? -a_ : a_;
}
FT_BASE_DEF( FT_Long )
- FT_MulDiv_No_Round( FT_Long a,
- FT_Long b,
- FT_Long c )
+ FT_MulDiv_No_Round( FT_Long a_,
+ FT_Long b_,
+ FT_Long c_ )
{
- FT_Int s = 1;
+ FT_Int s = 1;
+ FT_UInt32 a, b, c;
+
+ /* XXX: this function does not allow 64-bit arguments */
- if ( a == 0 || b == c )
- return a;
+ FT_MOVE_SIGN( a_, s );
+ FT_MOVE_SIGN( b_, s );
+ FT_MOVE_SIGN( c_, s );
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
- FT_MOVE_SIGN( c, s );
+ a = (FT_UInt32)a_;
+ b = (FT_UInt32)b_;
+ c = (FT_UInt32)c_;
if ( c == 0 )
- a = 0x7FFFFFFFL;
+ a = 0x7FFFFFFFUL;
- else if ( (FT_ULong)a + b <= 131071UL )
- a = (FT_ULong)a * b / c;
+ else if ( a + b <= 131071UL )
+ a = a * b / c;
else
{
@@ -475,19 +496,21 @@
: ft_div64by32( temp.hi, temp.lo, c );
}
- return ( s < 0 ? -a : a );
+ a_ = (FT_Long)a;
+
+ return s < 0 ? -a_ : a_;
}
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Long )
- FT_MulFix( FT_Long a,
- FT_Long b )
+ FT_MulFix( FT_Long a_,
+ FT_Long b_ )
{
#ifdef FT_MULFIX_ASSEMBLER
- return FT_MULFIX_ASSEMBLER( a, b );
+ return FT_MULFIX_ASSEMBLER( a_, b_ );
#elif 0
@@ -498,12 +521,9 @@
* the leftmost bits by copying the sign bit, it might be faster.
*/
- FT_Long sa, sb;
- FT_ULong ua, ub;
-
+ FT_Long sa, sb;
+ FT_UInt32 a, b;
- if ( a == 0 || b == 0x10000L )
- return a;
/*
* This is a clever way of converting a signed number `a' into its
@@ -523,57 +543,58 @@
* with the value 1 rather than -1. After that, everything else goes
* wrong.
*/
- sa = ( a >> ( sizeof ( a ) * 8 - 1 ) );
- a = ( a ^ sa ) - sa;
- sb = ( b >> ( sizeof ( b ) * 8 - 1 ) );
- b = ( b ^ sb ) - sb;
+ sa = ( a_ >> ( sizeof ( a_ ) * 8 - 1 ) );
+ a = ( a_ ^ sa ) - sa;
+ sb = ( b_ >> ( sizeof ( b_ ) * 8 - 1 ) );
+ b = ( b_ ^ sb ) - sb;
- ua = (FT_ULong)a;
- ub = (FT_ULong)b;
+ a = (FT_UInt32)a_;
+ b = (FT_UInt32)b_;
- if ( ua + ( ub >> 8 ) <= 8190UL )
- ua = ( ua * ub + 0x8000U ) >> 16;
+ if ( a + ( b >> 8 ) <= 8190UL )
+ a = ( a * b + 0x8000U ) >> 16;
else
{
- FT_ULong al = ua & 0xFFFFU;
+ FT_UInt32 al = a & 0xFFFFUL;
- ua = ( ua >> 16 ) * ub + al * ( ub >> 16 ) +
- ( ( al * ( ub & 0xFFFFU ) + 0x8000U ) >> 16 );
+ a = ( a >> 16 ) * b + al * ( b >> 16 ) +
+ ( ( al * ( b & 0xFFFFUL ) + 0x8000UL ) >> 16 );
}
- sa ^= sb,
- ua = (FT_ULong)(( ua ^ sa ) - sa);
+ sa ^= sb;
+ a = ( a ^ sa ) - sa;
- return (FT_Long)ua;
+ return (FT_Long)a;
#else /* 0 */
- FT_Int s = 1;
- FT_ULong ua, ub;
+ FT_Int s = 1;
+ FT_UInt32 a, b;
- if ( a == 0 || b == 0x10000L )
- return a;
+ /* XXX: this function does not allow 64-bit arguments */
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
+ FT_MOVE_SIGN( a_, s );
+ FT_MOVE_SIGN( b_, s );
- ua = (FT_ULong)a;
- ub = (FT_ULong)b;
+ a = (FT_UInt32)a_;
+ b = (FT_UInt32)b_;
- if ( ua + ( ub >> 8 ) <= 8190UL )
- ua = ( ua * ub + 0x8000UL ) >> 16;
+ if ( a + ( b >> 8 ) <= 8190UL )
+ a = ( a * b + 0x8000UL ) >> 16;
else
{
- FT_ULong al = ua & 0xFFFFUL;
+ FT_UInt32 al = a & 0xFFFFUL;
- ua = ( ua >> 16 ) * ub + al * ( ub >> 16 ) +
- ( ( al * ( ub & 0xFFFFUL ) + 0x8000UL ) >> 16 );
+ a = ( a >> 16 ) * b + al * ( b >> 16 ) +
+ ( ( al * ( b & 0xFFFFUL ) + 0x8000UL ) >> 16 );
}
- return ( s < 0 ? -(FT_Long)ua : (FT_Long)ua );
+ a_ = (FT_Long)a;
+
+ return s < 0 ? -a_ : a_;
#endif /* 0 */
@@ -583,27 +604,31 @@
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Long )
- FT_DivFix( FT_Long a,
- FT_Long b )
+ FT_DivFix( FT_Long a_,
+ FT_Long b_ )
{
- FT_Int s = 1;
- FT_Long q;
+ FT_Int s = 1;
+ FT_UInt32 a, b, q;
+ FT_Long q_;
/* XXX: this function does not allow 64-bit arguments */
- FT_MOVE_SIGN( a, s );
- FT_MOVE_SIGN( b, s );
+ FT_MOVE_SIGN( a_, s );
+ FT_MOVE_SIGN( b_, s );
+
+ a = (FT_UInt32)a_;
+ b = (FT_UInt32)b_;
if ( b == 0 )
{
/* check for division by 0 */
- q = 0x7FFFFFFFL;
+ q = 0x7FFFFFFFUL;
}
- else if ( a <= 65535L - ( b >> 17 ) )
+ else if ( a <= 65535UL - ( b >> 17 ) )
{
/* compute result directly */
- q = (FT_Long)( ( ( (FT_ULong)a << 16 ) + ( b >> 1 ) ) / b );
+ q = ( ( a << 16 ) + ( b >> 1 ) ) / b;
}
else
{
@@ -617,14 +642,16 @@
temp2.lo = b >> 1;
FT_Add64( &temp, &temp2, &temp );
- q = (FT_Long)ft_div64by32( temp.hi, temp.lo, b );
+ q = ft_div64by32( temp.hi, temp.lo, b );
}
- return ( s < 0 ? -q : q );
+ q_ = (FT_Long)q;
+
+ return s < 0 ? -q_ : q_;
}
-#endif /* FT_LONG64 */
+#endif /* !FT_LONG64 */
/* documentation is in ftglyph.h */
@@ -731,6 +758,102 @@
}
+ /* documentation is in ftcalc.h */
+
+ FT_BASE_DEF( FT_UInt32 )
+ FT_Vector_NormLen( FT_Vector* vector )
+ {
+ FT_Int32 x_ = vector->x;
+ FT_Int32 y_ = vector->y;
+ FT_Int32 b, z;
+ FT_UInt32 x, y, u, v, l;
+ FT_Int sx = 1, sy = 1, shift;
+
+
+ FT_MOVE_SIGN( x_, sx );
+ FT_MOVE_SIGN( y_, sy );
+
+ x = (FT_UInt32)x_;
+ y = (FT_UInt32)y_;
+
+ /* trivial cases */
+ if ( x == 0 )
+ {
+ if ( y > 0 )
+ vector->y = sy * 0x10000;
+ return y;
+ }
+ else if ( y == 0 )
+ {
+ if ( x > 0 )
+ vector->x = sx * 0x10000;
+ return x;
+ }
+
+ /* Estimate length and prenormalize by shifting so that */
+ /* the new approximate length is between 2/3 and 4/3. */
+ /* The magic constant 0xAAAAAAAAUL (2/3 of 2^32) helps */
+ /* achieve this in 16.16 fixed-point representation. */
+ l = x > y ? x + ( y >> 1 )
+ : y + ( x >> 1 );
+
+ shift = 31 - FT_MSB( l );
+ shift -= 15 + ( l >= ( 0xAAAAAAAAUL >> shift ) );
+
+ if ( shift > 0 )
+ {
+ x <<= shift;
+ y <<= shift;
+
+ /* re-estimate length for tiny vectors */
+ l = x > y ? x + ( y >> 1 )
+ : y + ( x >> 1 );
+ }
+ else
+ {
+ x >>= -shift;
+ y >>= -shift;
+ l >>= -shift;
+ }
+
+ /* lower linear approximation for reciprocal length minus one */
+ b = 0x10000 - (FT_Int32)l;
+
+ x_ = (FT_Int32)x;
+ y_ = (FT_Int32)y;
+
+ /* Newton's iterations */
+ do
+ {
+ u = (FT_UInt32)( x_ + ( x_ * b >> 16 ) );
+ v = (FT_UInt32)( y_ + ( y_ * b >> 16 ) );
+
+ /* Normalized squared length in the parentheses approaches 2^32. */
+ /* On two's complement systems, converting to signed gives the */
+ /* difference with 2^32 even if the expression wraps around. */
+ z = -(FT_Int32)( u * u + v * v ) / 0x200;
+ z = z * ( ( 0x10000 + b ) >> 8 ) / 0x10000;
+
+ b += z;
+
+ } while ( z > 0 );
+
+ vector->x = sx < 0 ? -(FT_Pos)u : (FT_Pos)u;
+ vector->y = sy < 0 ? -(FT_Pos)v : (FT_Pos)v;
+
+ /* Conversion to signed helps to recover from likely wrap around */
+ /* in calculating the prenormalized length, because it gives the */
+ /* correct difference with 2^32 on two's complement systems. */
+ l = (FT_UInt32)( 0x10000 + (FT_Int32)( u * x + v * y ) / 0x10000 );
+ if ( shift > 0 )
+ l = ( l + ( 1 << ( shift - 1 ) ) ) >> shift;
+ else
+ l <<= -shift;
+
+ return l;
+ }
+
+
#if 0
/* documentation is in ftcalc.h */
@@ -747,7 +870,7 @@
if ( x > 0 )
{
rem_hi = 0;
- rem_lo = x;
+ rem_lo = (FT_UInt32)x;
count = 24;
do
{
@@ -778,58 +901,40 @@
FT_Pos out_x,
FT_Pos out_y )
{
- FT_Long result; /* avoid overflow on 16-bit system */
-
-
- /* deal with the trivial cases quickly */
- if ( in_y == 0 )
- {
- if ( in_x >= 0 )
- result = out_y;
- else
- result = -out_y;
- }
- else if ( in_x == 0 )
- {
- if ( in_y >= 0 )
- result = -out_x;
- else
- result = out_x;
- }
- else if ( out_y == 0 )
- {
- if ( out_x >= 0 )
- result = in_y;
- else
- result = -in_y;
- }
- else if ( out_x == 0 )
- {
- if ( out_y >= 0 )
- result = -in_x;
- else
- result = in_x;
- }
- else /* general case */
- {
#ifdef FT_LONG64
- FT_Int64 delta = (FT_Int64)in_x * out_y - (FT_Int64)in_y * out_x;
+ FT_Int64 delta = (FT_Int64)in_x * out_y - (FT_Int64)in_y * out_x;
- if ( delta == 0 )
- result = 0;
- else
- result = 1 - 2 * ( delta < 0 );
+ return ( delta > 0 ) - ( delta < 0 );
#else
+ FT_Int result;
+
+
+ if ( (FT_ULong)FT_ABS( in_x ) + (FT_ULong)FT_ABS( out_y ) <= 131071UL &&
+ (FT_ULong)FT_ABS( in_y ) + (FT_ULong)FT_ABS( out_x ) <= 131071UL )
+ {
+ FT_Long z1 = in_x * out_y;
+ FT_Long z2 = in_y * out_x;
+
+
+ if ( z1 > z2 )
+ result = +1;
+ else if ( z1 < z2 )
+ result = -1;
+ else
+ result = 0;
+ }
+ else /* products might overflow 32 bits */
+ {
FT_Int64 z1, z2;
/* XXX: this function does not allow 64-bit arguments */
- ft_multo64( (FT_Int32)in_x, (FT_Int32)out_y, &z1 );
- ft_multo64( (FT_Int32)in_y, (FT_Int32)out_x, &z2 );
+ ft_multo64( (FT_UInt32)in_x, (FT_UInt32)out_y, &z1 );
+ ft_multo64( (FT_UInt32)in_y, (FT_UInt32)out_x, &z2 );
if ( z1.hi > z2.hi )
result = +1;
@@ -841,12 +946,12 @@
result = -1;
else
result = 0;
-
-#endif
}
/* XXX: only the sign of return value, +1/0/-1 must be used */
- return (FT_Int)result;
+ return result;
+
+#endif
}
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