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bentley-ottman: End subsumed colinear traps

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I'm not quite sure how we end up with a pair of colinear edges both with
a deferred trap...

Fixes crash in bug-bo-ricotz

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-09-16 12:35:45 +01:00
parent 0aabde2314
commit a0ec977944
1 changed files with 9 additions and 3 deletions
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12
src/cairo-bentley-ottmann.c
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@ -1434,12 +1434,18 @@ _active_edges_to_traps (cairo_bo_edge_t *pos,
left = pos;
while (pos != NULL) {
if (pos != left && pos->deferred_trap.right) {
if (edges_colinear (left, pos)) {
/* XXX It shouldn't be possible to here with 2 deferred traps
* on colinear edges... See bug-bo-rictoz.
*/
if (left->deferred_trap.right == NULL &&
edges_colinear (left, pos))
{
/* continuation on left */
assert (left->deferred_trap.right == NULL);
left->deferred_trap = pos->deferred_trap;
pos->deferred_trap.right = NULL;
} else {
}
else
{
status = _cairo_bo_edge_end_trap (pos, top, traps);
if (unlikely (status))
return status;