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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* sharpen.cpp - sharpening control algorithm
*/
#include <math.h>
#include <libcamera/base/log.h>
#include "../sharpen_status.h"
#include "sharpen.hpp"
using namespace RPiController;
using namespace libcamera;
LOG_DEFINE_CATEGORY(RPiSharpen)
#define NAME "rpi.sharpen"
Sharpen::Sharpen(Controller *controller)
: SharpenAlgorithm(controller), user_strength_(1.0)
{
}
char const *Sharpen::Name() const
{
return NAME;
}
void Sharpen::SwitchMode(CameraMode const &camera_mode,
[[maybe_unused]] Metadata *metadata)
{
// can't be less than one, right?
mode_factor_ = std::max(1.0, camera_mode.noise_factor);
}
void Sharpen::Read(boost::property_tree::ptree const ¶ms)
{
threshold_ = params.get<double>("threshold", 1.0);
strength_ = params.get<double>("strength", 1.0);
limit_ = params.get<double>("limit", 1.0);
LOG(RPiSharpen, Debug)
<< "Read threshold " << threshold_
<< " strength " << strength_
<< " limit " << limit_;
}
void Sharpen::SetStrength(double strength)
{
// Note that this function is how an application sets the overall
// sharpening "strength". We call this the "user strength" field
// as there already is a strength_ field - being an internal gain
// parameter that gets passed to the ISP control code. Negative
// values are not allowed - coerce them to zero (no sharpening).
user_strength_ = std::max(0.0, strength);
}
void Sharpen::Prepare(Metadata *image_metadata)
{
// The user_strength_ affects the algorithm's internal gain directly, but
// we adjust the limit and threshold less aggressively. Using a sqrt
// function is an arbitrary but gentle way of accomplishing this.
double user_strength_sqrt = sqrt(user_strength_);
struct SharpenStatus status;
// Binned modes seem to need the sharpening toned down with this
// pipeline, thus we use the mode_factor here. Also avoid
// divide-by-zero with the user_strength_sqrt.
status.threshold = threshold_ * mode_factor_ /
std::max(0.01, user_strength_sqrt);
status.strength = strength_ / mode_factor_ * user_strength_;
status.limit = limit_ / mode_factor_ * user_strength_sqrt;
// Finally, report any application-supplied parameters that were used.
status.user_strength = user_strength_;
image_metadata->Set("sharpen.status", status);
}
// Register algorithm with the system.
static Algorithm *Create(Controller *controller)
{
return new Sharpen(controller);
}
static RegisterAlgorithm reg(NAME, &Create);
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