336 lines
10 KiB
C++
336 lines
10 KiB
C++
#ifndef MTUTILS_HPP
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#define MTUTILS_HPP
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#include <atomic> // for std::atomic_flag and memory orders
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#include <mutex> // for std::lock_guard
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#include <functional> // for std::function
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#include <utility> // for std::forward
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#include <algorithm>
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#include "libslic3r.h"
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#include "Point.hpp"
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namespace Slic3r {
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/// Handy little spin mutex for the cached meshes.
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/// Implements the "Lockable" concept
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class SpinMutex
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{
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std::atomic_flag m_flg;
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static const /*constexpr*/ auto MO_ACQ = std::memory_order_acquire;
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static const /*constexpr*/ auto MO_REL = std::memory_order_release;
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public:
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inline SpinMutex() { m_flg.clear(MO_REL); }
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inline void lock() { while (m_flg.test_and_set(MO_ACQ)) ; }
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inline bool try_lock() { return !m_flg.test_and_set(MO_ACQ); }
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inline void unlock() { m_flg.clear(MO_REL); }
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};
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/// A wrapper class around arbitrary object that needs thread safe caching.
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template<class T> class CachedObject
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{
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public:
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// Method type which refreshes the object when it has been invalidated
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using Setter = std::function<void(T &)>;
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private:
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T m_obj; // the object itself
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bool m_valid; // invalidation flag
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SpinMutex m_lck; // to make the caching thread safe
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// the setter will be called just before the object's const value is
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// about to be retrieved.
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std::function<void(T &)> m_setter;
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public:
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// Forwarded constructor
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template<class... Args>
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inline CachedObject(Setter fn, Args &&... args)
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: m_obj(std::forward<Args>(args)...), m_valid(false), m_setter(fn)
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{}
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// invalidate the value of the object. The object will be refreshed at
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// the next retrieval (Setter will be called). The data that is used in
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// the setter function should be guarded as well during modification so
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// the modification has to take place in fn.
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inline void invalidate(std::function<void()> fn)
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{
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std::lock_guard<SpinMutex> lck(m_lck);
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fn();
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m_valid = false;
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}
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// Get the const object properly updated.
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inline const T &get()
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{
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std::lock_guard<SpinMutex> lck(m_lck);
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if (!m_valid) {
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m_setter(m_obj);
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m_valid = true;
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}
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return m_obj;
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}
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};
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/// An std compatible random access iterator which uses indices to the
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/// source vector thus resistant to invalidation caused by relocations. It
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/// also "knows" its container. No comparison is neccesary to the container
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/// "end()" iterator. The template can be instantiated with a different
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/// value type than that of the container's but the types must be
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/// compatible. E.g. a base class of the contained objects is compatible.
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///
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/// For a constant iterator, one can instantiate this template with a value
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/// type preceded with 'const'.
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template<class Vector, // The container type, must be random access...
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class Value = typename Vector::value_type // The value type
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>
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class IndexBasedIterator
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{
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static const size_t NONE = size_t(-1);
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std::reference_wrapper<Vector> m_index_ref;
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size_t m_idx = NONE;
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public:
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using value_type = Value;
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using pointer = Value *;
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using reference = Value &;
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using difference_type = long;
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using iterator_category = std::random_access_iterator_tag;
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inline explicit IndexBasedIterator(Vector &index, size_t idx)
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: m_index_ref(index), m_idx(idx)
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{}
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// Post increment
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inline IndexBasedIterator operator++(int)
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{
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IndexBasedIterator cpy(*this);
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++m_idx;
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return cpy;
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}
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inline IndexBasedIterator operator--(int)
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{
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IndexBasedIterator cpy(*this);
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--m_idx;
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return cpy;
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}
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inline IndexBasedIterator &operator++()
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{
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++m_idx;
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return *this;
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}
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inline IndexBasedIterator &operator--()
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{
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--m_idx;
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return *this;
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}
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inline IndexBasedIterator &operator+=(difference_type l)
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{
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m_idx += size_t(l);
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return *this;
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}
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inline IndexBasedIterator operator+(difference_type l)
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{
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auto cpy = *this;
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cpy += l;
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return cpy;
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}
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inline IndexBasedIterator &operator-=(difference_type l)
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{
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m_idx -= size_t(l);
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return *this;
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}
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inline IndexBasedIterator operator-(difference_type l)
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{
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auto cpy = *this;
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cpy -= l;
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return cpy;
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}
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operator difference_type() { return difference_type(m_idx); }
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/// Tesing the end of the container... this is not possible with std
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/// iterators.
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inline bool is_end() const
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{
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return m_idx >= m_index_ref.get().size();
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}
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inline Value &operator*() const
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{
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assert(m_idx < m_index_ref.get().size());
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return m_index_ref.get().operator[](m_idx);
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}
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inline Value *operator->() const
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{
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assert(m_idx < m_index_ref.get().size());
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return &m_index_ref.get().operator[](m_idx);
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}
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/// If both iterators point past the container, they are equal...
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inline bool operator==(const IndexBasedIterator &other)
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{
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size_t e = m_index_ref.get().size();
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return m_idx == other.m_idx || (m_idx >= e && other.m_idx >= e);
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}
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inline bool operator!=(const IndexBasedIterator &other)
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{
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return !(*this == other);
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}
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inline bool operator<=(const IndexBasedIterator &other)
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{
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return (m_idx < other.m_idx) || (*this == other);
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}
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inline bool operator<(const IndexBasedIterator &other)
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{
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return m_idx < other.m_idx && (*this != other);
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}
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inline bool operator>=(const IndexBasedIterator &other)
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{
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return m_idx > other.m_idx || *this == other;
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}
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inline bool operator>(const IndexBasedIterator &other)
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{
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return m_idx > other.m_idx && *this != other;
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}
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};
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/// A very simple range concept implementation with iterator-like objects.
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template<class It> class Range
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{
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It from, to;
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public:
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// The class is ready for range based for loops.
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It begin() const { return from; }
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It end() const { return to; }
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// The iterator type can be obtained this way.
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using Type = It;
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Range() = default;
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Range(It &&b, It &&e)
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: from(std::forward<It>(b)), to(std::forward<It>(e))
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{}
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// Some useful container-like methods...
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inline size_t size() const { return end() - begin(); }
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inline bool empty() const { return size() == 0; }
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};
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template<class C> bool all_of(const C &container)
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{
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return std::all_of(container.begin(),
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container.end(),
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[](const typename C::value_type &v) {
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return static_cast<bool>(v);
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});
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}
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// A shorter C++14 style form of the enable_if metafunction
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template<bool B, class T>
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using enable_if_t = typename std::enable_if<B, T>::type;
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// /////////////////////////////////////////////////////////////////////////////
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// Type safe conversions to and from scaled and unscaled coordinates
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// /////////////////////////////////////////////////////////////////////////////
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// A meta-predicate which is true for integers wider than or equal to coord_t
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template<class I> struct is_scaled_coord
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{
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static const SLIC3R_CONSTEXPR bool value =
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std::is_integral<I>::value &&
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std::numeric_limits<I>::digits >=
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std::numeric_limits<coord_t>::digits;
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};
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// Meta predicates for floating, 'scaled coord' and generic arithmetic types
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template<class T>
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using FloatingOnly = enable_if_t<std::is_floating_point<T>::value, T>;
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template<class T>
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using ScaledCoordOnly = enable_if_t<is_scaled_coord<T>::value, T>;
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template<class T>
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using ArithmeticOnly = enable_if_t<std::is_arithmetic<T>::value, T>;
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// A shorter form for a generic Eigen vector which is widely used in PrusaSlicer
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template<class T, int N>
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using EigenVec = Eigen::Matrix<T, N, 1, Eigen::DontAlign>;
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// Semantics are the following:
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// Upscaling (scaled()): only from floating point types (or Vec) to either
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// floating point or integer 'scaled coord' coordinates.
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// Downscaling (unscaled()): from arithmetic types (or Vec) to either
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// floating point only
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// Conversion definition from unscaled to floating point scaled
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template<class Tout,
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class Tin,
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class = FloatingOnly<Tin>,
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class = FloatingOnly<Tout>>
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inline SLIC3R_CONSTEXPR Tout scaled(const Tin &v) SLIC3R_NOEXCEPT
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{
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return static_cast<Tout>(v / static_cast<Tout>(SCALING_FACTOR));
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}
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// Conversion definition from unscaled to integer 'scaled coord'.
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// TODO: is the rounding necessary ? Here it is to show that it can be different
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// but it does not have to be. Using std::round means loosing noexcept and
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// constexpr modifiers
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template<class Tout = coord_t, class Tin, class = FloatingOnly<Tin>>
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inline SLIC3R_CONSTEXPR ScaledCoordOnly<Tout> scaled(const Tin &v) SLIC3R_NOEXCEPT
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{
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//return static_cast<Tout>(std::round(v / SCALING_FACTOR));
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return static_cast<Tout>(v / static_cast<Tout>(SCALING_FACTOR));
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}
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// Conversion for Eigen vectors (N dimensional points)
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template<class Tout = coord_t, class Tin, int N, class = FloatingOnly<Tin>>
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inline EigenVec<ArithmeticOnly<Tout>, N> scaled(const EigenVec<Tin, N> &v)
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{
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return v.template cast<Tout>() / SCALING_FACTOR;
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}
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// Conversion from arithmetic scaled type to floating point unscaled
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template<class Tout = double,
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class Tin,
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class = ArithmeticOnly<Tin>,
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class = FloatingOnly<Tout>>
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inline SLIC3R_CONSTEXPR Tout unscaled(const Tin &v) SLIC3R_NOEXCEPT
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{
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return static_cast<Tout>(v * static_cast<Tout>(SCALING_FACTOR));
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}
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// Unscaling for Eigen vectors. Input base type can be arithmetic, output base
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// type can only be floating point.
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template<class Tout = double,
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class Tin,
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int N,
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class = ArithmeticOnly<Tin>,
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class = FloatingOnly<Tout>>
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inline SLIC3R_CONSTEXPR EigenVec<Tout, N> unscaled(
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const EigenVec<Tin, N> &v) SLIC3R_NOEXCEPT
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{
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return v.template cast<Tout>() * SCALING_FACTOR;
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}
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} // namespace Slic3r
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#endif // MTUTILS_HPP
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