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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2012-04-19 15:48:01 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2012-04-19 15:48:01 +0100 |
| commit | 5e39a8098b88b2e8d25eb46c6bbe8656c9e0260c (patch) | |
| tree | 2157485c0e1a46b33c64fbf120c8744e1d30d7a5 /src/cairo-fixed-private.h | |
| parent | 57cfdfd9796531a576060e9304715920e0fdb8fe (diff) | |
| download | cairo-5e39a8098b88b2e8d25eb46c6bbe8656c9e0260c.tar.gz | |
dash: Use a epsilon compare for stepping the dash
Due to rounding errors that may creep in comparing against 0.0 is
dangerous and may result in an infinite loop whilst generating dashes
that consumes all memory.
Reported-and-tested-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'src/cairo-fixed-private.h')
| -rw-r--r-- | src/cairo-fixed-private.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/cairo-fixed-private.h b/src/cairo-fixed-private.h index 9a16a037b..b6cc6be7d 100644 --- a/src/cairo-fixed-private.h +++ b/src/cairo-fixed-private.h @@ -52,6 +52,8 @@ #define CAIRO_FIXED_ONE_DOUBLE ((double)(1 << CAIRO_FIXED_FRAC_BITS)) #define CAIRO_FIXED_EPSILON ((cairo_fixed_t)(1)) +#define CAIRO_FIXED_ERROR_DOUBLE (1. / (2 * CAIRO_FIXED_ONE_DOUBLE)) + #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) |