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add some compost effects.

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bolero-MURAKAMI 2012-11-09 22:33:11 +09:00
parent d01ee064e2
commit c7e6be98bb
20 changed files with 1815 additions and 6 deletions
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126
sprout/compost/effects/compress.hpp Normal file
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#ifndef SPROUT_COMPOST_EFFECTS_COMPRESS_HPP
#define SPROUT_COMPOST_EFFECTS_COMPRESS_HPP
#include <sprout/config.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/range/adaptor/transformed.hpp>
namespace sprout {
namespace compost {
namespace detail {
template<typename Value, typename T>
SPROUT_CONSTEXPR T
compress_value(T const& x, Value const& threshold, Value const& ratio, Value const& gain) {
return (x > threshold ? threshold + (x - threshold) * ratio
: x < -threshold ? -threshold + (x + threshold) * ratio
: x
) * gain
;
}
} // namespace detail
//
// compress_value
//
template<typename Value, typename T = void>
struct compress_value {
public:
typedef Value value_type;
typedef T argument_type;
typedef T result_type;
private:
value_type threshold_;
value_type ratio_;
value_type gain_;
public:
SPROUT_CONSTEXPR compress_value(Value const& threshold, Value const& ratio)
: threshold_(threshold), ratio_(ratio), gain_(1 / (threshold + (1 - threshold) * ratio))
{}
SPROUT_CONSTEXPR result_type
operator()(T const& x) const {
return sprout::compost::detail::compress_value(x, threshold_, ratio_, gain_);
}
};
template<typename Value>
struct compress_value<Value, void> {
public:
typedef Value value_type;
private:
value_type threshold_;
value_type ratio_;
value_type gain_;
public:
SPROUT_CONSTEXPR compress_value(Value const& threshold, Value const& ratio)
: threshold_(threshold), ratio_(ratio), gain_(1 / (threshold + (1 - threshold) * ratio))
{}
template<typename T>
SPROUT_CONSTEXPR T
operator()(T const& x) const {
return sprout::compost::detail::compress_value(x, threshold_, ratio_, gain_);
}
};
namespace effects {
//
// compress_holder
//
template<typename T>
class compress_holder {
public:
typedef T value_type;
private:
value_type threshold_;
value_type ratio_;
public:
compress_holder() = default;
compress_holder(compress_holder const&) = default;
SPROUT_CONSTEXPR compress_holder(value_type const& threshold, value_type const& ratio)
: threshold_(threshold), ratio_(ratio)
{}
SPROUT_CONSTEXPR value_type const& threshold() const {
return threshold_;
}
SPROUT_CONSTEXPR value_type const& ratio() const {
return ratio_;
}
};
//
// compressed_forwarder
//
class compressed_forwarder {
public:
template<typename T>
SPROUT_CONSTEXPR sprout::compost::effects::compress_holder<T>
operator()(T const& threshold, T const& ratio) {
return sprout::compost::effects::compress_holder<T>(threshold, ratio);
}
};
//
// compressed
//
namespace {
SPROUT_STATIC_CONSTEXPR sprout::compost::effects::compressed_forwarder compressed{};
} // anonymous-namespace
//
// operator|
//
template<typename Range, typename T>
inline SPROUT_CONSTEXPR auto
operator|(Range&& lhs, sprout::compost::effects::compress_holder<T> const& rhs)
-> decltype(
sprout::forward<Range>(lhs)
| sprout::adaptors::transformed(sprout::compost::compress_value<T>(rhs.threshold(), rhs.ratio()))
)
{
return sprout::forward<Range>(lhs)
| sprout::adaptors::transformed(sprout::compost::compress_value<T>(rhs.threshold(), rhs.ratio()))
;
}
} // namespace effects
} // namespace compost
} // namespace sprout
#endif // #ifndef SPROUT_COMPOST_EFFECTS_COMPRESS_HPP