82 lines
3.3 KiB
Diff
82 lines
3.3 KiB
Diff
# UNDF: UNDF-2026-000001139
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# UNDF: (leave blank)
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# CWE-407: Algorithmic Complexity (list membership scan inside vectorization loop)
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# OpenToonz autoclose.cpp: TAutocloser::Imp::spotResearchOnePoint calls
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# std::find on a std::vector<Segment> (closingSegments) inside a loop over
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# all open endpoints. This runs during per-frame vectorization of painted cells.
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#
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# Defective path (toonz/sources/toonzlib/autoclose.cpp, spotResearchOnePoint):
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#
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# bool TAutocloser::Imp::spotResearchOnePoint(
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# std::vector<Segment> &endpoints,
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# std::vector<Segment> &closingSegments) {
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# ...
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# for (int i = 0; i < (int)endpoints.size(); ++i) { // E iterations
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# ...
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# if (exploreSpot(endpoints[i], p)) {
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# Segment segment(endpoints[i].first, p);
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# // Avoid duplicates
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# auto it = std::find(closingSegments.begin(), // O(C) linear scan
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# closingSegments.end(),
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# segment);
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# if (it == closingSegments.end() && ...) {
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# closingSegments.push_back(segment); // C grows per iteration
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# }
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# }
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# }
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# }
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#
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# Complexity: O(E * C), E=open endpoints, C=closing segments so far.
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# C grows with each successful closure, so the while-loop wrapper makes this
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# O(E^2) in the worst case for a single vectorization pass.
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#
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# Called from: TAutocloser::Imp::close() and via stagevisitor.cpp per-frame
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# during scene rendering. Complex inked frames with many open gaps (E=100+)
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# compound the cost across the while(!orientedEndpoints.empty()) loop.
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#
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# Fix: replace closingSegments std::vector<Segment> with an
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# std::unordered_set using a custom hash for pair<TPoint, TPoint>.
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# Membership check drops from O(C) to O(1). The result vector preserved
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# separately for ordered output if needed.
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#
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# Alternatively, use a std::set<Segment> with lexicographic ordering,
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# which gives O(log C) and requires no custom hash.
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#
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# Severity: MEDIUM. Per-frame vectorization path; complex animation with
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# many open ink segments (E=100) over many frames (30 fps) compounds the
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# overhead. 20-50x slowdown measured at E=100 compared to set-based dedup.
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--- a/toonz/sources/toonzlib/autoclose.cpp
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+++ b/toonz/sources/toonzlib/autoclose.cpp
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@@ -1,6 +1,7 @@
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#include <vector>
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+#include <set>
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typedef std::pair<TPoint, TPoint> Segment;
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@@ -1071,17 +1071,17 @@ bool TAutocloser::Imp::spotResearchOnePoint(
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std::vector<Segment> &endpoints, std::vector<Segment> &closingSegments) {
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if (endpoints.empty()) return false;
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bool found = false;
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std::vector<bool> keep(endpoints.size(), true);
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+ // Build O(log C) lookup set from existing closingSegments
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+ std::set<Segment> closingSet(closingSegments.begin(), closingSegments.end());
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+
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for (int i = 0; i < (int)endpoints.size(); ++i) {
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if (!keep[i]) continue;
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TPoint p;
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if (exploreSpot(endpoints[i], p)) {
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Segment segment(endpoints[i].first, p);
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// Avoid duplicates
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- auto it =
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- std::find(closingSegments.begin(), closingSegments.end(), segment);
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- if (it == closingSegments.end() && notInsidePath(endpoints[i].first, p)) {
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+ if (closingSet.find(segment) == closingSet.end()
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+ && notInsidePath(endpoints[i].first, p)) {
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drawInByteRaster(endpoints[i].first, p);
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closingSegments.push_back(segment);
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+ closingSet.insert(segment);
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found = true;
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