443 lines
18 KiB
C++
443 lines
18 KiB
C++
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/*
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Copyright 2008 Intel Corporation
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Use, modification and distribution are subject to the Boost Software License,
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Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt).
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*/
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#ifndef BOOST_POLYGON_BOOLEAN_OP_HPP
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#define BOOST_POLYGON_BOOLEAN_OP_HPP
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namespace boost { namespace polygon{
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namespace boolean_op {
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//BooleanOp is the generic boolean operation scanline algorithm that provides
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//all the simple boolean set operations on manhattan data. By templatizing
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//the intersection count of the input and algorithm internals it is extensible
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//to multi-layer scans, properties and other advanced scanline operations above
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//and beyond simple booleans.
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//T must cast to int
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template <class T, typename Unit>
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class BooleanOp {
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public:
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typedef std::map<Unit, T> ScanData;
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typedef std::pair<Unit, T> ElementType;
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protected:
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ScanData scanData_;
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typename ScanData::iterator nextItr_;
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T nullT_;
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public:
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inline BooleanOp () : scanData_(), nextItr_(), nullT_() { nextItr_ = scanData_.end(); nullT_ = 0; }
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inline BooleanOp (T nullT) : scanData_(), nextItr_(), nullT_(nullT) { nextItr_ = scanData_.end(); }
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inline BooleanOp (const BooleanOp& that) : scanData_(that.scanData_), nextItr_(),
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nullT_(that.nullT_) { nextItr_ = scanData_.begin(); }
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inline BooleanOp& operator=(const BooleanOp& that);
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//moves scanline forward
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inline void advanceScan() { nextItr_ = scanData_.begin(); }
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//proceses the given interval and T data
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//appends output edges to cT
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template <class cT>
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inline void processInterval(cT& outputContainer, interval_data<Unit> ivl, T deltaCount);
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private:
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inline typename ScanData::iterator lookup_(Unit pos){
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if(nextItr_ != scanData_.end() && nextItr_->first >= pos) {
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return nextItr_;
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}
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return nextItr_ = scanData_.lower_bound(pos);
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}
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inline typename ScanData::iterator insert_(Unit pos, T count){
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return nextItr_ = scanData_.insert(nextItr_, ElementType(pos, count));
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}
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template <class cT>
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inline void evaluateInterval_(cT& outputContainer, interval_data<Unit> ivl, T beforeCount, T afterCount);
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};
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class BinaryAnd {
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public:
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inline BinaryAnd() {}
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inline bool operator()(int a, int b) { return (a > 0) & (b > 0); }
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};
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class BinaryOr {
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public:
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inline BinaryOr() {}
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inline bool operator()(int a, int b) { return (a > 0) | (b > 0); }
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};
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class BinaryNot {
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public:
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inline BinaryNot() {}
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inline bool operator()(int a, int b) { return (a > 0) & !(b > 0); }
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};
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class BinaryXor {
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public:
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inline BinaryXor() {}
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inline bool operator()(int a, int b) { return (a > 0) ^ (b > 0); }
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};
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//BinaryCount is an array of two deltaCounts coming from two different layers
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//of scan event data. It is the merged count of the two suitable for consumption
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//as the template argument of the BooleanOp algorithm because BinaryCount casts to int.
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//T is a binary functor object that evaluates the array of counts and returns a logical
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//result of some operation on those values.
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//BinaryCount supports many of the operators that work with int, particularly the
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//binary operators, but cannot support less than or increment.
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template <class T>
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class BinaryCount {
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public:
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inline BinaryCount()
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#ifndef BOOST_POLYGON_MSVC
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: counts_()
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#endif
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{ counts_[0] = counts_[1] = 0; }
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// constructs from two integers
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inline BinaryCount(int countL, int countR)
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#ifndef BOOST_POLYGON_MSVC
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: counts_()
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#endif
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{ counts_[0] = countL, counts_[1] = countR; }
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inline BinaryCount& operator=(int count) { counts_[0] = count, counts_[1] = count; return *this; }
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inline BinaryCount& operator=(const BinaryCount& that);
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inline BinaryCount(const BinaryCount& that)
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#ifndef BOOST_POLYGON_MSVC
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: counts_()
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#endif
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{ *this = that; }
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inline bool operator==(const BinaryCount& that) const;
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inline bool operator!=(const BinaryCount& that) const { return !((*this) == that);}
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inline BinaryCount& operator+=(const BinaryCount& that);
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inline BinaryCount& operator-=(const BinaryCount& that);
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inline BinaryCount operator+(const BinaryCount& that) const;
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inline BinaryCount operator-(const BinaryCount& that) const;
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inline BinaryCount operator-() const;
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inline int& operator[](bool index) { return counts_[index]; }
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//cast to int operator evaluates data using T binary functor
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inline operator int() const { return T()(counts_[0], counts_[1]); }
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private:
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int counts_[2];
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};
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class UnaryCount {
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public:
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inline UnaryCount() : count_(0) {}
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// constructs from two integers
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inline explicit UnaryCount(int count) : count_(count) {}
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inline UnaryCount& operator=(int count) { count_ = count; return *this; }
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inline UnaryCount& operator=(const UnaryCount& that) { count_ = that.count_; return *this; }
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inline UnaryCount(const UnaryCount& that) : count_(that.count_) {}
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inline bool operator==(const UnaryCount& that) const { return count_ == that.count_; }
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inline bool operator!=(const UnaryCount& that) const { return !((*this) == that);}
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inline UnaryCount& operator+=(const UnaryCount& that) { count_ += that.count_; return *this; }
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inline UnaryCount& operator-=(const UnaryCount& that) { count_ -= that.count_; return *this; }
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inline UnaryCount operator+(const UnaryCount& that) const { UnaryCount tmp(*this); tmp += that; return tmp; }
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inline UnaryCount operator-(const UnaryCount& that) const { UnaryCount tmp(*this); tmp -= that; return tmp; }
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inline UnaryCount operator-() const { UnaryCount tmp; return tmp - *this; }
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//cast to int operator evaluates data using T binary functor
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inline operator int() const { return count_ % 2; }
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private:
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int count_;
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};
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template <class T, typename Unit>
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inline BooleanOp<T, Unit>& BooleanOp<T, Unit>::operator=(const BooleanOp& that) {
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scanData_ = that.scanData_;
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nextItr_ = scanData_.begin();
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nullT_ = that.nullT_;
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return *this;
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}
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//appends output edges to cT
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template <class T, typename Unit>
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template <class cT>
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inline void BooleanOp<T, Unit>::processInterval(cT& outputContainer, interval_data<Unit> ivl, T deltaCount) {
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typename ScanData::iterator lowItr = lookup_(ivl.low());
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typename ScanData::iterator highItr = lookup_(ivl.high());
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//add interval to scan data if it is past the end
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if(lowItr == scanData_.end()) {
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lowItr = insert_(ivl.low(), deltaCount);
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highItr = insert_(ivl.high(), nullT_);
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evaluateInterval_(outputContainer, ivl, nullT_, deltaCount);
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return;
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}
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//ensure that highItr points to the end of the ivl
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if(highItr == scanData_.end() || (*highItr).first > ivl.high()) {
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T value = nullT_;
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if(highItr != scanData_.begin()) {
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--highItr;
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value = highItr->second;
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}
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nextItr_ = highItr;
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highItr = insert_(ivl.high(), value);
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}
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//split the low interval if needed
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if(lowItr->first > ivl.low()) {
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if(lowItr != scanData_.begin()) {
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--lowItr;
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nextItr_ = lowItr;
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lowItr = insert_(ivl.low(), lowItr->second);
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} else {
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nextItr_ = lowItr;
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lowItr = insert_(ivl.low(), nullT_);
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}
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}
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//process scan data intersecting interval
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for(typename ScanData::iterator itr = lowItr; itr != highItr; ){
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T beforeCount = itr->second;
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T afterCount = itr->second += deltaCount;
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Unit low = itr->first;
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++itr;
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Unit high = itr->first;
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evaluateInterval_(outputContainer, interval_data<Unit>(low, high), beforeCount, afterCount);
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}
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//merge the bottom interval with the one below if they have the same count
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if(lowItr != scanData_.begin()){
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typename ScanData::iterator belowLowItr = lowItr;
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--belowLowItr;
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if(belowLowItr->second == lowItr->second) {
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scanData_.erase(lowItr);
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}
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}
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//merge the top interval with the one above if they have the same count
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if(highItr != scanData_.begin()) {
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typename ScanData::iterator beforeHighItr = highItr;
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--beforeHighItr;
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if(beforeHighItr->second == highItr->second) {
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scanData_.erase(highItr);
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highItr = beforeHighItr;
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++highItr;
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}
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}
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nextItr_ = highItr;
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}
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template <class T, typename Unit>
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template <class cT>
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inline void BooleanOp<T, Unit>::evaluateInterval_(cT& outputContainer, interval_data<Unit> ivl,
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T beforeCount, T afterCount) {
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bool before = (int)beforeCount > 0;
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bool after = (int)afterCount > 0;
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int value = (!before & after) - (before & !after);
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if(value) {
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outputContainer.insert(outputContainer.end(), std::pair<interval_data<Unit>, int>(ivl, value));
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}
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}
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template <class T>
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inline BinaryCount<T>& BinaryCount<T>::operator=(const BinaryCount<T>& that) {
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counts_[0] = that.counts_[0];
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counts_[1] = that.counts_[1];
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return *this;
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}
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template <class T>
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inline bool BinaryCount<T>::operator==(const BinaryCount<T>& that) const {
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return counts_[0] == that.counts_[0] &&
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counts_[1] == that.counts_[1];
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}
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template <class T>
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inline BinaryCount<T>& BinaryCount<T>::operator+=(const BinaryCount<T>& that) {
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counts_[0] += that.counts_[0];
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counts_[1] += that.counts_[1];
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return *this;
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}
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template <class T>
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inline BinaryCount<T>& BinaryCount<T>::operator-=(const BinaryCount<T>& that) {
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counts_[0] += that.counts_[0];
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counts_[1] += that.counts_[1];
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return *this;
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}
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template <class T>
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inline BinaryCount<T> BinaryCount<T>::operator+(const BinaryCount<T>& that) const {
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BinaryCount retVal(*this);
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retVal += that;
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return retVal;
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}
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template <class T>
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inline BinaryCount<T> BinaryCount<T>::operator-(const BinaryCount<T>& that) const {
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BinaryCount retVal(*this);
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retVal -= that;
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return retVal;
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}
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template <class T>
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inline BinaryCount<T> BinaryCount<T>::operator-() const {
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return BinaryCount<T>() - *this;
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}
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template <class T, typename Unit, typename iterator_type_1, typename iterator_type_2>
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inline void applyBooleanBinaryOp(std::vector<std::pair<Unit, std::pair<Unit, int> > >& output,
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//const std::vector<std::pair<Unit, std::pair<Unit, int> > >& input1,
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//const std::vector<std::pair<Unit, std::pair<Unit, int> > >& input2,
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iterator_type_1 itr1, iterator_type_1 itr1_end,
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iterator_type_2 itr2, iterator_type_2 itr2_end,
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T defaultCount) {
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BooleanOp<T, Unit> boolean(defaultCount);
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//typename std::vector<std::pair<Unit, std::pair<Unit, int> > >::const_iterator itr1 = input1.begin();
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//typename std::vector<std::pair<Unit, std::pair<Unit, int> > >::const_iterator itr2 = input2.begin();
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std::vector<std::pair<interval_data<Unit>, int> > container;
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//output.reserve((std::max)(input1.size(), input2.size()));
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//consider eliminating dependecy on limits with bool flag for initial state
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Unit UnitMax = (std::numeric_limits<Unit>::max)();
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Unit prevCoord = UnitMax;
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Unit prevPosition = UnitMax;
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T count(defaultCount);
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//define the starting point
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if(itr1 != itr1_end) {
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prevCoord = (*itr1).first;
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prevPosition = (*itr1).second.first;
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count[0] += (*itr1).second.second;
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}
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if(itr2 != itr2_end) {
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if((*itr2).first < prevCoord ||
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((*itr2).first == prevCoord && (*itr2).second.first < prevPosition)) {
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prevCoord = (*itr2).first;
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prevPosition = (*itr2).second.first;
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count = defaultCount;
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count[1] += (*itr2).second.second;
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++itr2;
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} else if((*itr2).first == prevCoord && (*itr2).second.first == prevPosition) {
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count[1] += (*itr2).second.second;
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++itr2;
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if(itr1 != itr1_end) ++itr1;
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} else {
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if(itr1 != itr1_end) ++itr1;
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}
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} else {
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if(itr1 != itr1_end) ++itr1;
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}
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while(itr1 != itr1_end || itr2 != itr2_end) {
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Unit curCoord = UnitMax;
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Unit curPosition = UnitMax;
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T curCount(defaultCount);
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if(itr1 != itr1_end) {
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curCoord = (*itr1).first;
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curPosition = (*itr1).second.first;
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curCount[0] += (*itr1).second.second;
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}
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if(itr2 != itr2_end) {
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if((*itr2).first < curCoord ||
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((*itr2).first == curCoord && (*itr2).second.first < curPosition)) {
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curCoord = (*itr2).first;
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curPosition = (*itr2).second.first;
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curCount = defaultCount;
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curCount[1] += (*itr2).second.second;
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++itr2;
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} else if((*itr2).first == curCoord && (*itr2).second.first == curPosition) {
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curCount[1] += (*itr2).second.second;
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++itr2;
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if(itr1 != itr1_end) ++itr1;
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} else {
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if(itr1 != itr1_end) ++itr1;
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}
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} else {
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++itr1;
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}
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if(prevCoord != curCoord) {
|
||
|
|
boolean.advanceScan();
|
||
|
|
prevCoord = curCoord;
|
||
|
|
prevPosition = curPosition;
|
||
|
|
count = curCount;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if(curPosition != prevPosition && count != defaultCount) {
|
||
|
|
interval_data<Unit> ivl(prevPosition, curPosition);
|
||
|
|
container.clear();
|
||
|
|
boolean.processInterval(container, ivl, count);
|
||
|
|
for(std::size_t i = 0; i < container.size(); ++i) {
|
||
|
|
std::pair<interval_data<Unit>, int>& element = container[i];
|
||
|
|
if(!output.empty() && output.back().first == prevCoord &&
|
||
|
|
output.back().second.first == element.first.low() &&
|
||
|
|
output.back().second.second == element.second * -1) {
|
||
|
|
output.pop_back();
|
||
|
|
} else {
|
||
|
|
output.push_back(std::pair<Unit, std::pair<Unit, int> >(prevCoord, std::pair<Unit, int>(element.first.low(),
|
||
|
|
element.second)));
|
||
|
|
}
|
||
|
|
output.push_back(std::pair<Unit, std::pair<Unit, int> >(prevCoord, std::pair<Unit, int>(element.first.high(),
|
||
|
|
element.second * -1)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
prevPosition = curPosition;
|
||
|
|
count += curCount;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class T, typename Unit>
|
||
|
|
inline void applyBooleanBinaryOp(std::vector<std::pair<Unit, std::pair<Unit, int> > >& inputOutput,
|
||
|
|
const std::vector<std::pair<Unit, std::pair<Unit, int> > >& input2,
|
||
|
|
T defaultCount) {
|
||
|
|
std::vector<std::pair<Unit, std::pair<Unit, int> > > output;
|
||
|
|
applyBooleanBinaryOp(output, inputOutput, input2, defaultCount);
|
||
|
|
if(output.size() < inputOutput.size() / 2) {
|
||
|
|
inputOutput = std::vector<std::pair<Unit, std::pair<Unit, int> > >();
|
||
|
|
} else {
|
||
|
|
inputOutput.clear();
|
||
|
|
}
|
||
|
|
inputOutput.insert(inputOutput.end(), output.begin(), output.end());
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename count_type = int>
|
||
|
|
struct default_arg_workaround {
|
||
|
|
template <typename Unit>
|
||
|
|
static inline void applyBooleanOr(std::vector<std::pair<Unit, std::pair<Unit, int> > >& input) {
|
||
|
|
BooleanOp<count_type, Unit> booleanOr;
|
||
|
|
std::vector<std::pair<interval_data<Unit>, int> > container;
|
||
|
|
std::vector<std::pair<Unit, std::pair<Unit, int> > > output;
|
||
|
|
output.reserve(input.size());
|
||
|
|
//consider eliminating dependecy on limits with bool flag for initial state
|
||
|
|
Unit UnitMax = (std::numeric_limits<Unit>::max)();
|
||
|
|
Unit prevPos = UnitMax;
|
||
|
|
Unit prevY = UnitMax;
|
||
|
|
int count = 0;
|
||
|
|
for(typename std::vector<std::pair<Unit, std::pair<Unit, int> > >::iterator itr = input.begin();
|
||
|
|
itr != input.end(); ++itr) {
|
||
|
|
Unit pos = (*itr).first;
|
||
|
|
Unit y = (*itr).second.first;
|
||
|
|
if(pos != prevPos) {
|
||
|
|
booleanOr.advanceScan();
|
||
|
|
prevPos = pos;
|
||
|
|
prevY = y;
|
||
|
|
count = (*itr).second.second;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if(y != prevY && count != 0) {
|
||
|
|
interval_data<Unit> ivl(prevY, y);
|
||
|
|
container.clear();
|
||
|
|
booleanOr.processInterval(container, ivl, count_type(count));
|
||
|
|
for(std::size_t i = 0; i < container.size(); ++i) {
|
||
|
|
std::pair<interval_data<Unit>, int>& element = container[i];
|
||
|
|
if(!output.empty() && output.back().first == prevPos &&
|
||
|
|
output.back().second.first == element.first.low() &&
|
||
|
|
output.back().second.second == element.second * -1) {
|
||
|
|
output.pop_back();
|
||
|
|
} else {
|
||
|
|
output.push_back(std::pair<Unit, std::pair<Unit, int> >(prevPos, std::pair<Unit, int>(element.first.low(),
|
||
|
|
element.second)));
|
||
|
|
}
|
||
|
|
output.push_back(std::pair<Unit, std::pair<Unit, int> >(prevPos, std::pair<Unit, int>(element.first.high(),
|
||
|
|
element.second * -1)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
prevY = y;
|
||
|
|
count += (*itr).second.second;
|
||
|
|
}
|
||
|
|
if(output.size() < input.size() / 2) {
|
||
|
|
input = std::vector<std::pair<Unit, std::pair<Unit, int> > >();
|
||
|
|
} else {
|
||
|
|
input.clear();
|
||
|
|
}
|
||
|
|
input.insert(input.end(), output.begin(), output.end());
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
#endif
|