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Another Clipper optimization. When adding a set of paths

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to Clipper, allocate the edges in a single continuous vector.
This commit is contained in:
bubnikv 2017-03-03 21:40:40 +01:00
parent fa4df36963
commit f24427cd76
2 changed files with 68 additions and 21 deletions
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88
xs/src/clipper.cpp
View file

@ -896,6 +896,72 @@ TEdge* ClipperBase::ProcessBound(TEdge* E, bool NextIsForward)
//------------------------------------------------------------------------------
bool ClipperBase::AddPath(const Path &pg, PolyType PolyTyp, bool Closed)
{
PROFILE_FUNC();
// Remove duplicate end point from a closed input path.
// Remove duplicate points from the end of the input path.
int highI = (int)pg.size() -1;
if (Closed)
while (highI > 0 && (pg[highI] == pg[0]))
--highI;
while (highI > 0 && (pg[highI] == pg[highI -1]))
--highI;
if ((Closed && highI < 2) || (!Closed && highI < 1))
return false;
// Allocate a new edge array.
std::vector<TEdge> edges(highI + 1);
// Fill in the edge array.
bool result = AddPathInternal(pg, highI, PolyTyp, Closed, edges.data());
if (result)
// Success, remember the edge array.
m_edges.emplace_back(std::move(edges));
return result;
}
bool ClipperBase::AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed)
{
PROFILE_FUNC();
std::vector<int> num_edges(ppg.size(), 0);
int num_edges_total = 0;
for (size_t i = 0; i < ppg.size(); ++ i) {
const Path &pg = ppg[i];
// Remove duplicate end point from a closed input path.
// Remove duplicate points from the end of the input path.
int highI = (int)pg.size() -1;
if (Closed)
while (highI > 0 && (pg[highI] == pg[0]))
--highI;
while (highI > 0 && (pg[highI] == pg[highI -1]))
--highI;
if ((Closed && highI < 2) || (!Closed && highI < 1))
highI = -1;
num_edges[i] = highI + 1;
num_edges_total += highI + 1;
}
if (num_edges_total == 0)
return false;
// Allocate a new edge array.
std::vector<TEdge> edges(num_edges_total);
// Fill in the edge array.
bool result = false;
TEdge *p_edge = edges.data();
for (Paths::size_type i = 0; i < ppg.size(); ++i)
if (num_edges[i]) {
bool res = AddPathInternal(ppg[i], num_edges[i] - 1, PolyTyp, Closed, p_edge);
if (res) {
p_edge += num_edges[i];
result = true;
}
}
if (result)
// At least some edges were generated. Remember the edge array.
m_edges.emplace_back(std::move(edges));
return result;
}
bool ClipperBase::AddPathInternal(const Path &pg, int highI, PolyType PolyTyp, bool Closed, TEdge* edges)
{
PROFILE_FUNC();
#ifdef use_lines
@ -906,15 +972,7 @@ bool ClipperBase::AddPath(const Path &pg, PolyType PolyTyp, bool Closed)
throw clipperException("AddPath: Open paths have been disabled.");
#endif
// Remove duplicate end point from a closed input path.
// Remove duplicate points from the end of the input path.
int highI = (int)pg.size() -1;
if (Closed) while (highI > 0 && (pg[highI] == pg[0])) --highI;
while (highI > 0 && (pg[highI] == pg[highI -1])) --highI;
if ((Closed && highI < 2) || (!Closed && highI < 1)) return false;
//create a new edge array ...
std::vector<TEdge> edges(highI + 1);
assert(highI >= 0 && highI < pg.size());
//1. Basic (first) edge initialization ...
try
@ -1018,11 +1076,9 @@ bool ClipperBase::AddPath(const Path &pg, PolyType PolyTyp, bool Closed)
E = E->Next;
}
m_MinimaList.push_back(locMin);
m_edges.emplace_back(std::move(edges));
return true;
}
m_edges.emplace_back(std::move(edges));
bool leftBoundIsForward;
TEdge* EMin = 0;
@ -1079,16 +1135,6 @@ bool ClipperBase::AddPath(const Path &pg, PolyType PolyTyp, bool Closed)
}
//------------------------------------------------------------------------------
bool ClipperBase::AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed)
{
PROFILE_FUNC();
bool result = false;
for (Paths::size_type i = 0; i < ppg.size(); ++i)
if (AddPath(ppg[i], PolyTyp, Closed)) result = true;
return result;
}
//------------------------------------------------------------------------------
void ClipperBase::Clear()
{
PROFILE_FUNC();

1
xs/src/clipper.hpp
View file

@ -291,6 +291,7 @@ public:
bool PreserveCollinear() const {return m_PreserveCollinear;};
void PreserveCollinear(bool value) {m_PreserveCollinear = value;};
protected:
bool AddPathInternal(const Path &pg, int highI, PolyType PolyTyp, bool Closed, TEdge* edges);
TEdge* AddBoundsToLML(TEdge *e, bool IsClosed);
virtual void Reset();
TEdge* ProcessBound(TEdge* E, bool IsClockwise);