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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Ideas On Board
*
* constrast.cpp - IPU3 Contrast and Gamma control
*/
#include "contrast.h"
#include <cmath>
#include <libcamera/base/log.h>
namespace libcamera {
namespace ipa::ipu3::algorithms {
LOG_DEFINE_CATEGORY(IPU3Contrast)
Contrast::Contrast()
: gamma_(1.0)
{
}
void Contrast::initialise(IPAContext &context)
{
ipu3_uapi_params ¶ms = context.params;
/* Limit the gamma effect for now */
gamma_ = 1.1;
/* Plot the gamma curve into the look up table */
for (uint32_t i = 0; i < 256; i++) {
double j = i / 255.0;
double gamma = std::pow(j, 1.0 / gamma_);
/* The maximum value 255 is represented on 13 bits in the IPU3 */
params.acc_param.gamma.gc_lut.lut[i] = gamma * 8191;
}
LOG(IPU3Contrast, Info) << "Processed Gamma Curve";
}
} /* namespace ipa::ipu3::algorithms */
} /* namespace libcamera */
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