diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2010-01-12 17:00:25 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-01-12 17:07:30 +0000 |
| commit | 74ea4c908067f5579b51d3dbaea387da8f343671 (patch) | |
| tree | 446c908643e34fde4673f7a2ffddf870d99a7b82 /src/cairo-path-fixed.c | |
| parent | a5dd5a6069c0d7435260a954d8d98483f5fbcc1c (diff) | |
path: Do not remove anti-parallel line segments in case we are stroking
Bug 26010 - cairo_line_to optimizes away path segments
http://bugs.freedesktop.org/show_bug.cgi?id=26010
As exercised by path-stroke-twice, we incorrectly optimise away a line
segment if the path doubled back upon itself. This is very reminiscent
of the optimisation bug for replacing curve-to with line-to.
Diffstat (limited to 'src/cairo-path-fixed.c')
| -rw-r--r-- | src/cairo-path-fixed.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/cairo-path-fixed.c b/src/cairo-path-fixed.c index 42172c674..34de6a37b 100644 --- a/src/cairo-path-fixed.c +++ b/src/cairo-path-fixed.c @@ -480,7 +480,10 @@ _cairo_path_fixed_line_to (cairo_path_fixed_t *path, _cairo_slope_init (&prev, p, &path->current_point); _cairo_slope_init (&self, &path->current_point, &point); - if (_cairo_slope_equal (&prev, &self)) { + if (_cairo_slope_equal (&prev, &self) && + /* cannot trim anti-parallel segments whilst stroking */ + ! _cairo_slope_backwards (&prev, &self)) + { buf->points[buf->num_points - 1] = point; goto FLAGS; } |