diff options
Diffstat (limited to 'src/gpu/GrTessellator.cpp')
-rw-r--r-- | src/gpu/GrTessellator.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/gpu/GrTessellator.cpp b/src/gpu/GrTessellator.cpp index 5f25e5a5fb..2cb9adcbf8 100644 --- a/src/gpu/GrTessellator.cpp +++ b/src/gpu/GrTessellator.cpp @@ -1078,6 +1078,17 @@ uint8_t max_edge_alpha(Edge* a, Edge* b) { } } +bool out_of_range_and_collinear(const SkPoint& p, Edge* edge, Comparator& c) { + if (c.sweep_lt(p, edge->fTop->fPoint) && + !Line(p, edge->fBottom->fPoint).dist(edge->fTop->fPoint)) { + return true; + } else if (c.sweep_lt(edge->fBottom->fPoint, p) && + !Line(edge->fTop->fPoint, p).dist(edge->fBottom->fPoint)) { + return true; + } + return false; +} + bool check_for_intersection(Edge* edge, Edge* other, EdgeList* activeEdges, Vertex** current, VertexList* mesh, Comparator& c, SkArenaAlloc& alloc) { if (!edge || !other) { @@ -1086,6 +1097,12 @@ bool check_for_intersection(Edge* edge, Edge* other, EdgeList* activeEdges, Vert SkPoint p; uint8_t alpha; if (edge->intersect(*other, &p, &alpha) && p.isFinite()) { + // Ignore any out-of-range intersections which are also collinear, + // since the resulting edges would cancel each other out by merging. + if (out_of_range_and_collinear(p, edge, c) || + out_of_range_and_collinear(p, other, c)) { + return false; + } Vertex* v; LOG("found intersection, pt is %g, %g\n", p.fX, p.fY); Vertex* top = *current; |