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| author | Andrea Canciani <ranma42@gmail.com> | 2010-06-16 22:54:08 +0200 |
|---|---|---|
| committer | Andrea Canciani <ranma42@gmail.com> | 2010-06-16 22:59:46 +0200 |
| commit | 3cd07559328b60e3da85debb805cb4a3fc4abc22 (patch) | |
| tree | daaeeeffc77736b26075e0927d4124e3ab29a871 /src/cairo-fixed-private.h | |
| parent | 8689d75caaa9c6ee42976873d21684fa9f48834f (diff) | |
| download | cairo-3cd07559328b60e3da85debb805cb4a3fc4abc22.tar.gz | |
correct rounding computation
cairo_fixed_integer_round[_down] were adding an unsigned mask value
before shifting its result, causing the shift to be computed as
logical (unsigned) right shift, thus producing incorrect values for
negative inputs. Making the mask value signed fixes this issue.
Bug report by cu:
http://lists.cairographics.org/archives/cairo/2010-June/020115.html
Diffstat (limited to 'src/cairo-fixed-private.h')
| -rw-r--r-- | src/cairo-fixed-private.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cairo-fixed-private.h b/src/cairo-fixed-private.h index 66898a20f..8873056cf 100644 --- a/src/cairo-fixed-private.h +++ b/src/cairo-fixed-private.h @@ -52,7 +52,7 @@ #define CAIRO_FIXED_ONE_DOUBLE ((double)(1 << CAIRO_FIXED_FRAC_BITS)) #define CAIRO_FIXED_EPSILON ((cairo_fixed_t)(1)) -#define CAIRO_FIXED_FRAC_MASK (((cairo_fixed_unsigned_t)(-1)) >> (CAIRO_FIXED_BITS - CAIRO_FIXED_FRAC_BITS)) +#define CAIRO_FIXED_FRAC_MASK ((cairo_fixed_t)(((cairo_fixed_unsigned_t)(-1)) >> (CAIRO_FIXED_BITS - CAIRO_FIXED_FRAC_BITS))) #define CAIRO_FIXED_WHOLE_MASK (~CAIRO_FIXED_FRAC_MASK) static inline cairo_fixed_t |