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[smooth] Fortify 64-bit algorithm. 

* src/smooth/ftgrays.c (FT_UDIVPREP, FT_UDIV): s/long/FT_Int64/ and
s/unsigned long/FT_UInt64/.
(gray_render_line): Adjust a critical variable type.
This commit is contained in:
Alexei Podtelezhnikov 2021-08-20 13:51:40 -04:00
parent f0f00f7c16
commit de3b5c201c
1 changed files with 6 additions and 6 deletions
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12
src/smooth/ftgrays.c
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@ -375,12 +375,12 @@ typedef ptrdiff_t FT_PtrDist;
/* These macros speed up repetitive divisions by replacing them */
/* with multiplications and right shifts. */
#define FT_UDIVPREP( c, b ) \
long b ## _r = c ? (long)( FT_ULONG_MAX >> PIXEL_BITS ) / ( b ) \
#define FT_UDIVPREP( c, b ) \
FT_Int64 b ## _r = c ? (FT_Int64)( ~(FT_UInt64)0 >> PIXEL_BITS ) / ( b ) \
: 0
#define FT_UDIV( a, b ) \
(TCoord)( ( (unsigned long)( a ) * (unsigned long)( b ## _r ) ) >> \
( sizeof( long ) * FT_CHAR_BIT - PIXEL_BITS ) )
#define FT_UDIV( a, b ) \
(TCoord)( ( (FT_UInt64)( a ) * (FT_UInt64)( b ## _r ) ) >> \
( sizeof( FT_UInt64 ) * FT_CHAR_BIT - PIXEL_BITS ) )
/* Scale area and apply fill rule to calculate the coverage byte. */
@ -921,7 +921,7 @@ typedef ptrdiff_t FT_PtrDist;
}
else /* any other line */
{
TPos prod = dx * (TPos)fy1 - dy * (TPos)fx1;
FT_Int64 prod = dx * (FT_Int64)fy1 - dy * (FT_Int64)fx1;
FT_UDIVPREP( ex1 != ex2, dx );
FT_UDIVPREP( ey1 != ey2, dy );