Fix of #8463 - Crash in SkeletalTrapezoidation::computePointCellRange() when a cell point didn't fit into Vec2i64 because it was too far away.

src/libslic3r/Arachne/SkeletalTrapezoidation.cpp

@@ -293,7 +293,15 @@ bool SkeletalTrapezoidation::computePointCellRange(vd_t::cell_type& cell, Point&
 
     // Check if any point of the cell is inside or outside polygon
     // Copy whole cell into graph or not at all
-    
+
+    // If the cell.incident_edge()->vertex0() is far away so much that it doesn't even fit into Vec2i64, then there is no way that it will be inside the input polygon.
+    assert(x <= double(std::numeric_limits<int64_t>::max()) && x >= std::numeric_limits<int64_t>::lowest());
+    assert(y <= double(std::numeric_limits<int64_t>::max()) && y >= std::numeric_limits<int64_t>::lowest());
+    if (const vd_t::vertex_type &vert = *cell.incident_edge()->vertex0();
+        vert.x() >= double(std::numeric_limits<int64_t>::max()) || vert.x() <= double(std::numeric_limits<int64_t>::lowest()) ||
+        vert.y() >= double(std::numeric_limits<int64_t>::max()) || vert.y() <= double(std::numeric_limits<int64_t>::lowest()))
+        return false; // Don't copy any part of this cell
+
     const Point source_point = VoronoiUtils::getSourcePoint(cell, segments);
     const PolygonsPointIndex source_point_index = VoronoiUtils::getSourcePointIndex(cell, segments);
     Vec2i64 some_point = VoronoiUtils::p(cell.incident_edge()->vertex0());

src/libslic3r/Arachne/utils/VoronoiUtils.cpp

@@ -17,7 +17,7 @@ Vec2i64 VoronoiUtils::p(const vd_t::vertex_type *node)
     const double y = node->y();
     assert(x <= double(std::numeric_limits<int64_t>::max()) && x >= std::numeric_limits<int64_t>::lowest());
     assert(y <= double(std::numeric_limits<int64_t>::max()) && y >= std::numeric_limits<int64_t>::lowest());
-    return Vec2i64(int64_t(x + 0.5 - (x < 0)), int64_t(y + 0.5 - (y < 0))); // Round to the nearest integer coordinates.
+    return {int64_t(x + 0.5 - (x < 0)), int64_t(y + 0.5 - (y < 0))}; // Round to the nearest integer coordinates.
 }
 
 Point VoronoiUtils::getSourcePoint(const vd_t::cell_type& cell, const std::vector<Segment>& segments)