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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi Ltd
*
* sharpen.cpp - sharpening control algorithm
*/
#include <math.h>
#include <libcamera/base/log.h>
#include "../sharpen_status.h"
#include "sharpen.h"
using namespace RPiController;
using namespace libcamera;
LOG_DEFINE_CATEGORY(RPiSharpen)
#define NAME "rpi.sharpen"
Sharpen::Sharpen(Controller *controller)
: SharpenAlgorithm(controller), userStrength_(1.0)
{
}
char const *Sharpen::name() const
{
return NAME;
}
void Sharpen::switchMode(CameraMode const &cameraMode,
[[maybe_unused]] Metadata *metadata)
{
/* can't be less than one, right? */
modeFactor_ = std::max(1.0, cameraMode.noiseFactor);
}
int Sharpen::read(const libcamera::YamlObject ¶ms)
{
threshold_ = params["threshold"].get<double>(1.0);
strength_ = params["strength"].get<double>(1.0);
limit_ = params["limit"].get<double>(1.0);
LOG(RPiSharpen, Debug)
<< "Read threshold " << threshold_
<< " strength " << strength_
<< " limit " << limit_;
return 0;
}
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).
*/
userStrength_ = std::max(0.0, strength);
}
void Sharpen::prepare(Metadata *imageMetadata)
{
/*
* The userStrength_ 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 userStrengthSqrt = sqrt(userStrength_);
struct SharpenStatus status;
/*
* Binned modes seem to need the sharpening toned down with this
* pipeline, thus we use the modeFactor_ here. Also avoid
* divide-by-zero with the userStrengthSqrt.
*/
status.threshold = threshold_ * modeFactor_ /
std::max(0.01, userStrengthSqrt);
status.strength = strength_ / modeFactor_ * userStrength_;
status.limit = limit_ / modeFactor_ * userStrengthSqrt;
/* Finally, report any application-supplied parameters that were used. */
status.userStrength = userStrength_;
imageMetadata->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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