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Code Issues 4 Releases Wiki Activity

[smooth] Replace left shifts with multiplications (#47114). 

* src/smooth/ftgrays.c (SUBPIXELS, UPSCALE, DOWNSCALE): Do it.
This commit is contained in:
Alexei Podtelezhnikov 2016-03-06 23:01:50 -05:00
parent caa48b0db1
commit d0b0e31ed7
2 changed files with 9 additions and 3 deletions
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ChangeLog
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@ -1,3 +1,9 @@
2016-03-06 Alexei Podtelezhnikov <apodtele@gmail.com>
[smooth] Replace left shifts with multiplications (#47114).
* src/smooth/ftgrays.c (SUBPIXELS, UPSCALE, DOWNSCALE): Do it.
2016-03-05 Werner Lemberg <wl@gnu.org>
[autofit] Avoid excessive stem length rounding (#25392).

6
src/smooth/ftgrays.c
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@ -320,17 +320,17 @@ typedef ptrdiff_t FT_PtrDist;
#define ONE_PIXEL ( 1L << PIXEL_BITS )
#define TRUNC( x ) ( (TCoord)( (x) >> PIXEL_BITS ) )
#define SUBPIXELS( x ) ( (TPos)(x) << PIXEL_BITS )
#define SUBPIXELS( x ) ( (TPos)(x) * ONE_PIXEL )
#define FLOOR( x ) ( (x) & -ONE_PIXEL )
#define CEILING( x ) ( ( (x) + ONE_PIXEL - 1 ) & -ONE_PIXEL )
#define ROUND( x ) ( ( (x) + ONE_PIXEL / 2 ) & -ONE_PIXEL )
#if PIXEL_BITS >= 6
#define UPSCALE( x ) ( (x) << ( PIXEL_BITS - 6 ) )
#define UPSCALE( x ) ( (x) * ( ONE_PIXEL >> 6 ) )
#define DOWNSCALE( x ) ( (x) >> ( PIXEL_BITS - 6 ) )
#else
#define UPSCALE( x ) ( (x) >> ( 6 - PIXEL_BITS ) )
#define DOWNSCALE( x ) ( (x) << ( 6 - PIXEL_BITS ) )
#define DOWNSCALE( x ) ( (x) * ( 64 >> PIXEL_BITS ) )
#endif