/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2021, Google inc. * * tone_mapping.cpp - IPU3 ToneMapping and Gamma control */ #include "tone_mapping.h" #include #include /** * \file tone_mapping.h */ namespace libcamera { namespace ipa::ipu3::algorithms { /** * \class ToneMapping * \brief A class to handle tone mapping based on gamma * * This algorithm improves the image dynamic using a look-up table which is * generated based on a gamma parameter. */ ToneMapping::ToneMapping() : gamma_(1.0) { } /** * \brief Configure the tone mapping given a configInfo * \param[in] context The shared IPA context * \param[in] configInfo The IPA configuration data * * \return 0 */ int ToneMapping::configure(IPAContext &context, [[maybe_unused]] const IPAConfigInfo &configInfo) { /* Initialise tone mapping gamma value. */ context.activeState.toneMapping.gamma = 0.0; return 0; } /** * \brief Fill in the parameter structure, and enable gamma control * \param context The shared IPA context * \param params The IPU3 parameters * * Populate the IPU3 parameter structure with our tone mapping look up table and * enable the gamma control module in the processing blocks. */ void ToneMapping::prepare([[maybe_unused]] IPAContext &context, ipu3_uapi_params *params) { /* Copy the calculated LUT into the parameters buffer. */ memcpy(params->acc_param.gamma.gc_lut.lut, context.activeState.toneMapping.gammaCorrection.lut, IPU3_UAPI_GAMMA_CORR_LUT_ENTRIES * sizeof(params->acc_param.gamma.gc_lut.lut[0])); /* Enable the custom gamma table. */ params->use.acc_gamma = 1; params->acc_param.gamma.gc_ctrl.enable = 1; } /** * \brief Calculate the tone mapping look up table * \param context The shared IPA context * \param frameContext The current frame context * \param stats The IPU3 statistics and ISP results * * The tone mapping look up table is generated as an inverse power curve from * our gamma setting. */ void ToneMapping::process(IPAContext &context, [[maybe_unused]] IPAFrameContext *frameContext, [[maybe_unused]] const ipu3_uapi_stats_3a *stats) { /* * Hardcode gamma to 1.1 as a default for now. * * \todo Expose gamma control setting through the libcamera control API */ gamma_ = 1.1; if (context.activeState.toneMapping.gamma == gamma_) return; struct ipu3_uapi_gamma_corr_lut &lut = context.activeState.toneMapping.gammaCorrection; for (uint32_t i = 0; i < std::size(lut.lut); i++) { double j = static_cast(i) / (std::size(lut.lut) - 1); double gamma = std::pow(j, 1.0 / gamma_); /* The output value is expressed on 13 bits. */ lut.lut[i] = gamma * 8191; } context.activeState.toneMapping.gamma = gamma_; } } /* namespace ipa::ipu3::algorithms */ } /* namespace libcamera */ vivid.git/plain/test/byte-stream-buffer.cpp?h=v0.0.4&id=ccfcf5f2356fc3bd1dfb825652b2f05738651b46'>plain) 
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2018, Google Inc.
 *
 * byte_stream_buffer.cpp - ByteStreamBuffer tests
 */

#include <array>
#include <iostream>

#include "libcamera/internal/byte_stream_buffer.h"

#include "test.h"

using namespace std;
using namespace libcamera;

class ByteStreamBufferTest : public Test
{
protected:
	int run()
	{
		/*
		 * gcc 11.1.0 incorrectly raises a maybe-uninitialized warning
		 * when calling data.size() below (if the address sanitizer is
		 * disabled). Silence it by initializing the array.
		 */
		std::array<uint8_t, 100> data = {};
		unsigned int i;
		uint32_t value;
		int ret;

		/*
		 * Write mode.
		 */
		ByteStreamBuffer wbuf(data.data(), data.size());

		if (wbuf.base() != data.data() || wbuf.size() != data.size() ||
		    wbuf.offset() != 0 || wbuf.overflow()) {