libcruft-util/extent.cpp

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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
* Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
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*/
#include "extent.hpp"
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#include "maths.hpp"
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#include <algorithm>
#include <numeric>
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using cruft::extent;
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
extent<S,T>::extent (vector<S,T> _v)
{
std::transform (std::begin (_v),
std::end (_v),
this->begin (),
[] (auto i) {
// using std::abs gives unsigned abs warnings under clang. this tricks
// it sufficiently to quiet the warnings.
return i < 0 ? -i : i;
});
}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
extent<S,T>
extent<S,T>::expanded (cruft::vector<S,T> mag) const
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{
return *this + mag;
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}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::expanded (T t) const
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{
return *this + cruft::vector<S,T> {t};
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}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::contracted (vector<S,T> t) const
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{
return *this - t;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::contracted (T t) const
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{
return *this - vector<S,T> {t};
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}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
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bool
extent<S,T>::empty (void) const
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{
return almost_zero (area());
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}
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///////////////////////////////////////////////////////////////////////////////
template <typename T>
cruft::extent2<T>
cruft::rotate90 (cruft::extent2<T> obj, int steps)
{
if (steps % 2) {
return { obj.h, obj.w };
} else {
return obj;
}
}
//-----------------------------------------------------------------------------
template cruft::extent2<i32> cruft::rotate90 (cruft::extent2<i32>, int);
template cruft::extent2<i64> cruft::rotate90 (cruft::extent2<i64>, int);
template cruft::extent2<f32> cruft::rotate90 (cruft::extent2<f32>, int);
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///////////////////////////////////////////////////////////////////////////////
namespace cruft::debug {
template <size_t S, typename T>
struct validator<extent<S,T>> {
static bool is_valid (const extent<S,T> &e)
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{
return std::all_of (std::begin (e.data),
std::end (e.data),
[] (auto i) { return i >= 0; });
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}
};
}
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//-----------------------------------------------------------------------------
#define INSTANTIATE_S_T(S,T) \
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template struct ::cruft::extent<(S),T>; \
template bool ::cruft::debug::is_valid (const ::cruft::extent<(S),T>&); \
template struct ::cruft::debug::validator<::cruft::extent<(S),T>>;
#define INSTANTIATE(T) \
INSTANTIATE_S_T(1,T) \
INSTANTIATE_S_T(2,T) \
INSTANTIATE_S_T(3,T)
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INSTANTIATE( int16_t)
INSTANTIATE( int32_t)
INSTANTIATE( int64_t)
INSTANTIATE(uint16_t)
INSTANTIATE(uint32_t)
INSTANTIATE(uint64_t)
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INSTANTIATE(float)
INSTANTIATE(double)