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Restore ring start point after wagyu #15309
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Original file line number | Diff line number | Diff line change |
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@@ -36,6 +36,27 @@ static GeometryCollection toGeometryCollection(MultiPolygon<int16_t>&& multipoly | |
return result; | ||
} | ||
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// Attempts to restore original point order in rings: | ||
// see https://github.com/mapbox/mapbox-gl-native/issues/15268. | ||
static GeometryCollection restorePointOrder(GeometryCollection&& rings, const GeometryCollection& originalRings) { | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. nameless namespace instead of static |
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if (rings.size() != originalRings.size()) { | ||
// No sense restoring starting point if polygons are changed. | ||
return std::move(rings); | ||
} | ||
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int i = 0; | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. std::size_t, int overflows and |
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for (auto& ring : rings) { | ||
const auto originalRing = originalRings[i++]; | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. const auto& ? |
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auto item = find(ring.begin(), ring.end() - 1, originalRing[0]); | ||
if (item != ring.end()) { | ||
rotate(ring.begin(), item, ring.end() - 1); | ||
// Close the ring. | ||
ring.back() = ring.front(); | ||
} | ||
} | ||
return std::move(rings); | ||
} | ||
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GeometryCollection fixupPolygons(const GeometryCollection& rings) { | ||
using namespace mapbox::geometry::wagyu; | ||
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@@ -48,7 +69,7 @@ GeometryCollection fixupPolygons(const GeometryCollection& rings) { | |
MultiPolygon<int16_t> multipolygon; | ||
clipper.execute(clip_type_union, multipolygon, fill_type_even_odd, fill_type_even_odd); | ||
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return toGeometryCollection(std::move(multipolygon)); | ||
return restorePointOrder(toGeometryCollection(std::move(multipolygon)), rings); | ||
} | ||
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std::vector<GeometryCollection> classifyRings(const GeometryCollection& rings) { | ||
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GeometryCollection rings
and then just return, without move to avoid disabling NRVO