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* src/base/fttrigon.c (ft_trig_downscale): Make 64bit version work.

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Werner Lemberg 2012-11-17 11:45:24 +01:00
parent 0690d3d7b5
commit fa22ec1cfb
2 changed files with 16 additions and 7 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2012-11-17 Werner Lemberg <wl@gnu.org>
* src/base/fttrigon.c (ft_trig_downscale): Make 64bit version work.
2012-11-15 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] Fix integer overflows in dd5718c7d67a.

17
src/base/fttrigon.c
View File

@ -4,7 +4,7 @@
/* */
/* FreeType trigonometric functions (body). */
/* */
/* Copyright 2001, 2002, 2003, 2004, 2005 by */
/* Copyright 2001-2005, 2012 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -21,6 +21,11 @@
#include FT_TRIGONOMETRY_H
#ifdef FT_LONG64
typedef FT_INT64 FT_Int64;
#endif
/* the following is 0.2715717684432231 * 2^30 */
#define FT_TRIG_COSCALE 0x11616E8EUL
@ -39,7 +44,7 @@
#define FT_TRIG_SCALE 1166391785UL /* 0x4585BA38UL */
#ifdef FT_CONFIG_HAS_INT64
#ifdef FT_LONG64
/* multiply a given value by the CORDIC shrink factor */
static FT_Fixed
@ -58,7 +63,7 @@
return ( s >= 0 ) ? val : -val;
}
#else /* !FT_CONFIG_HAS_INT64 */
#else /* !FT_LONG64 */
/* multiply a given value by the CORDIC shrink factor */
static FT_Fixed
@ -72,10 +77,10 @@
val = ( val >= 0 ) ? val : -val;
v1 = (FT_UInt32)val >> 16;
v2 = (FT_UInt32)(val & 0xFFFFL);
v2 = (FT_UInt32)( val & 0xFFFFL );
k1 = (FT_UInt32)FT_TRIG_SCALE >> 16; /* constant */
k2 = (FT_UInt32)(FT_TRIG_SCALE & 0xFFFFL); /* constant */
k2 = (FT_UInt32)( FT_TRIG_SCALE & 0xFFFFL ); /* constant */
hi = k1 * v1;
lo1 = k1 * v2 + k2 * v1; /* can't overflow */
@ -93,7 +98,7 @@
return ( s >= 0 ) ? val : -val;
}
#endif /* !FT_CONFIG_HAS_INT64 */
#endif /* !FT_LONG64 */
static FT_Int