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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Ideas On Board
*
* awb.h - IPU3 AWB control algorithm
*/
#pragma once
#include <vector>
#include <linux/intel-ipu3.h>
#include <libcamera/geometry.h>
#include "algorithm.h"
namespace libcamera {
namespace ipa::ipu3::algorithms {
/* Region size for the statistics generation algorithm */
static constexpr uint32_t kAwbStatsSizeX = 16;
static constexpr uint32_t kAwbStatsSizeY = 12;
struct Accumulator {
unsigned int counted;
struct {
uint64_t red;
uint64_t green;
uint64_t blue;
} sum;
};
class Awb : public Algorithm
{
public:
Awb();
~Awb();
int configure(IPAContext &context, const IPAConfigInfo &configInfo) override;
void prepare(IPAContext &context, const uint32_t frame,
IPAFrameContext &frameContext,
ipu3_uapi_params *params) override;
void process(IPAContext &context, const uint32_t frame,
IPAFrameContext &frameContext,
const ipu3_uapi_stats_3a *stats,
ControlList &metadata) override;
private:
/* \todo Make these structs available to all the ISPs ? */
struct RGB {
RGB(double _R = 0, double _G = 0, double _B = 0)
: R(_R), G(_G), B(_B)
{
}
double R, G, B;
RGB &operator+=(RGB const &other)
{
R += other.R, G += other.G, B += other.B;
return *this;
}
};
struct AwbStatus {
double temperatureK;
double redGain;
double greenGain;
double blueGain;
};
private:
void calculateWBGains(const ipu3_uapi_stats_3a *stats);
void generateZones();
void generateAwbStats(const ipu3_uapi_stats_3a *stats);
void clearAwbStats();
void awbGreyWorld();
uint32_t estimateCCT(double red, double green, double blue);
static constexpr uint16_t threshold(float value);
static constexpr uint16_t gainValue(double gain);
std::vector<RGB> zones_;
Accumulator awbStats_[kAwbStatsSizeX * kAwbStatsSizeY];
AwbStatus asyncResults_;
uint32_t stride_;
uint32_t cellsPerZoneX_;
uint32_t cellsPerZoneY_;
uint32_t cellsPerZoneThreshold_;
};
} /* namespace ipa::ipu3::algorithms */
} /* namespace libcamera*/
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