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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2022, Theobroma Systems
*
* af.cpp - RkISP1 AF hill climbing based control algorithm
*/
#include "af.h"
/**
* \file af.h
*/
namespace libcamera::ipa::rkisp1::algorithms {
/**
* \class Af
* \brief AF control algorithm
*/
LOG_DEFINE_CATEGORY(RkISP1Af)
static rkisp1_cif_isp_window rectangleToIspWindow(const Rectangle &rectangle)
{
rkisp1_cif_isp_window ispwindow;
ispwindow.h_offs = rectangle.x;
ispwindow.v_offs = rectangle.y;
ispwindow.h_size = rectangle.width;
ispwindow.v_size = rectangle.height;
return ispwindow;
}
/**
* \copydoc libcamera::ipa::Algorithm::configure
*/
int Af::configure([[maybe_unused]] IPAContext &context,
const IPACameraSensorInfo &configInfo)
{
/* Default AF window of 3/4 size of the screen placed at the center */
defaultWindow_ = Rectangle(configInfo.outputSize.width / 8,
configInfo.outputSize.height / 8,
3 * configInfo.outputSize.width / 4,
3 * configInfo.outputSize.height / 4);
updateCurrentWindow(defaultWindow_);
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::prepare
*/
void Af::prepare([[maybe_unused]] IPAContext &context, rkisp1_params_cfg *params)
{
if (updateAfwindow_) {
params->meas.afc_config.num_afm_win = 1;
params->meas.afc_config.thres = 128;
params->meas.afc_config.var_shift = 4;
/* \todo Allow setting thres and var_shift in tuning file */
params->meas.afc_config.afm_win[0] = rectangleToIspWindow(currentWindow_);
params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_AFC;
params->module_ens |= RKISP1_CIF_ISP_MODULE_AFC;
params->module_en_update |= RKISP1_CIF_ISP_MODULE_AFC;
updateAfwindow_ = false;
}
}
/**
* \copydoc libcamera::ipa::Algorithm::process
*/
void Af::process(IPAContext &context,
[[maybe_unused]] IPAFrameContext *frameCtx,
const rkisp1_stat_buffer *stats)
{
uint32_t sharpness = stats->params.af.window[0].sum;
uint32_t luminance = stats->params.af.window[0].lum;
LOG(RkISP1Af, Debug) << "lensPosition: " << context.frameContext.af.focus
<< ", Sharpness: " << sharpness
<< ", Luminance: " << luminance;
uint32_t lensPosition = processAutofocus(sharpness);
if (lensPosition != context.frameContext.af.focus) {
context.frameContext.af.focus = lensPosition;
setFramesToSkip(kFLensWaitFrames);
}
}
void Af::setMetering(controls::AfMeteringEnum metering)
{
if (metering == meteringMode_)
return;
if (metering == controls::AfMeteringWindows) {
updateCurrentWindow(userWindow_);
} else {
updateCurrentWindow(defaultWindow_);
}
meteringMode_ = metering;
}
void Af::setWindows(Span<const Rectangle> windows)
{
if (windows.size() != 1) {
LOG(RkISP1Af, Error) << "Only one AF window is supported";
return;
}
/* \todo Check if window size is valid for ISP */
LOG(RkISP1Af, Debug) << "setWindows: " << userWindow_;
userWindow_ = windows[0];
if (meteringMode_ == controls::AfMeteringWindows) {
updateCurrentWindow(userWindow_);
}
}
void Af::updateCurrentWindow(const Rectangle &window)
{
currentWindow_ = window;
updateAfwindow_ = true;
}
REGISTER_IPA_ALGORITHM(Af, "Af")
} /* namespace libcamera::ipa::rkisp1::algorithms */
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