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/*
* Copyright (c) 2021-2022, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/DeprecatedString.h>
#include <AK/FixedPoint.h>
#include <AK/Format.h>
#include <AK/Forward.h>
#include <AK/Function.h>
#include <AK/Types.h>
#include <LibDSP/Music.h>
namespace DSP {
using ParameterFixedPoint = FixedPoint<8, i64>;
// Identifies the different kinds of parameters.
// Note that achieving parameter type identification is NOT possible with typeid().
enum class ParameterType : u8 {
Invalid = 0,
Range,
Enum,
Boolean,
};
enum class Logarithmic : bool {
No,
Yes
};
// Processors have modifiable parameters that should be presented to the UI in a uniform way without requiring the processor itself to implement custom interfaces.
class ProcessorParameter {
public:
ProcessorParameter(DeprecatedString name, ParameterType type)
: m_name(move(name))
, m_type(type)
{
}
DeprecatedString const& name() const { return m_name; }
ParameterType type() const { return m_type; }
private:
DeprecatedString const m_name;
ParameterType const m_type;
};
namespace Detail {
struct ProcessorParameterSetValueTag {
explicit ProcessorParameterSetValueTag() = default;
};
template<typename ParameterT>
class ProcessorParameterSingleValue : public ProcessorParameter {
public:
ProcessorParameterSingleValue(DeprecatedString name, ParameterType type, ParameterT initial_value)
: ProcessorParameter(move(name), type)
, m_value(move(initial_value))
{
}
operator ParameterT() const
{
return value();
}
operator double() const
requires(IsSame<ParameterT, ParameterFixedPoint>)
{
return static_cast<double>(value());
}
ParameterT value() const { return m_value; };
void set_value(ParameterT value)
{
set_value_sneaky(value, DSP::Detail::ProcessorParameterSetValueTag {});
for (auto const& did_change_value : m_change_value_listeners)
did_change_value(value);
}
// Use of this function is discouraged. It doesn't notify the value listener.
void set_value_sneaky(ParameterT value, [[maybe_unused]] Detail::ProcessorParameterSetValueTag)
{
if (value != m_value)
m_value = value;
}
// FIXME: Devise a good API for unregistering listeners.
void register_change_listener(Function<void(ParameterT const&)> listener)
{
m_change_value_listeners.append(move(listener));
}
protected:
ParameterT m_value;
Vector<Function<void(ParameterT const&)>> m_change_value_listeners;
};
}
class ProcessorBooleanParameter final : public Detail::ProcessorParameterSingleValue<bool> {
public:
ProcessorBooleanParameter(DeprecatedString name, bool initial_value)
: Detail::ProcessorParameterSingleValue<bool>(move(name), ParameterType::Boolean, move(initial_value))
{
}
};
class ProcessorRangeParameter final : public Detail::ProcessorParameterSingleValue<ParameterFixedPoint> {
public:
ProcessorRangeParameter(DeprecatedString name, ParameterFixedPoint min_value, ParameterFixedPoint max_value, ParameterFixedPoint initial_value, Logarithmic logarithmic)
: Detail::ProcessorParameterSingleValue<ParameterFixedPoint>(move(name), ParameterType::Range, move(initial_value))
, m_min_value(move(min_value))
, m_max_value(move(max_value))
, m_default_value(move(initial_value))
, m_logarithmic(logarithmic)
{
VERIFY(initial_value <= max_value && initial_value >= min_value);
}
ProcessorRangeParameter(ProcessorRangeParameter const& to_copy)
: ProcessorRangeParameter(to_copy.name(), to_copy.min_value(), to_copy.max_value(), to_copy.value(), to_copy.is_logarithmic())
{
}
ParameterFixedPoint min_value() const { return m_min_value; }
ParameterFixedPoint max_value() const { return m_max_value; }
ParameterFixedPoint range() const { return m_max_value - m_min_value; }
constexpr Logarithmic is_logarithmic() const { return m_logarithmic; }
ParameterFixedPoint default_value() const { return m_default_value; }
void set_value(ParameterFixedPoint value)
{
VERIFY(value <= m_max_value && value >= m_min_value);
Detail::ProcessorParameterSingleValue<ParameterFixedPoint>::set_value(value);
}
private:
double const m_min_value;
double const m_max_value;
double const m_default_value;
Logarithmic const m_logarithmic;
};
template<typename EnumT>
requires(IsEnum<EnumT>) class ProcessorEnumParameter final : public Detail::ProcessorParameterSingleValue<EnumT> {
public:
ProcessorEnumParameter(DeprecatedString name, EnumT initial_value)
: Detail::ProcessorParameterSingleValue<EnumT>(move(name), ParameterType::Enum, initial_value)
{
}
};
}
template<>
struct AK::Formatter<DSP::ProcessorRangeParameter> : AK::StandardFormatter {
Formatter() = default;
explicit Formatter(StandardFormatter formatter)
: StandardFormatter(formatter)
{
}
ErrorOr<void> format(FormatBuilder& builder, DSP::ProcessorRangeParameter value)
{
if (m_mode == Mode::Pointer) {
Formatter<FlatPtr> formatter { *this };
return formatter.format(builder, reinterpret_cast<FlatPtr>(&value));
}
if (m_sign_mode != FormatBuilder::SignMode::Default)
VERIFY_NOT_REACHED();
if (m_alternative_form)
VERIFY_NOT_REACHED();
if (m_zero_pad)
VERIFY_NOT_REACHED();
if (m_mode != Mode::Default)
VERIFY_NOT_REACHED();
if (m_width.has_value() && m_precision.has_value())
VERIFY_NOT_REACHED();
m_width = m_width.value_or(0);
m_precision = m_precision.value_or(NumericLimits<size_t>::max());
TRY(builder.put_literal(DeprecatedString::formatted("[{} - {}]: {}", value.min_value(), value.max_value(), value.value())));
return {};
}
};
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