SPROUT_CONSTEXPR result_type
operator()(Unit const& u, Unit const& v) const {
return calc(
(u - offset_u_ + scale_ / 2) / scale_ * texture_.get().width(),
(-(v - offset_v_) + scale_ / 2) / scale_ * texture_.get().height()
);
}
SPROUT_CONSTEXPR result_type
get_color(unit_type const& x, unit_type const& y) const {
return is_tile()
? texture_.get()(
x < 0
? texture_.get().width() - 1 - static_cast<std::size_t>(-x) % texture_.get().width()
: static_cast<std::size_t>(x) % texture_.get().width()
,
y < 0
? texture_.get().height() - 1 - static_cast<std::size_t>(-y) % texture_.get().height()
: static_cast<std::size_t>(y) % texture_.get().height()
)
: x < 0 || x >= texture_.get().width()
|| y < 0 || y >= texture_.get().height()
? default_color_
: texture_.get()(static_cast<std::size_t>(x), static_cast<std::size_t>(y))
;
}
SPROUT_CONSTEXPR reference operator*() const {
return count_ != 0
? holder_.get()
: (throw std::out_of_range("value_iterator<>: dereference at out of range"), holder_.get())
;
}
operator value_iterator<const_type>() const {
return value_iterator<const_type>(holder_.get(), count_);
}
SPROUT_CONSTEXPR reference operator[](difference_type n) const {
return holder_.get();
}