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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 * Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
 *
 * v4l2_pixelformat.cpp - V4L2 Pixel Format
 */

#include "libcamera/internal/v4l2_pixelformat.h"

#include <ctype.h>
#include <map>
#include <string.h>

#include <libcamera/formats.h>
#include <libcamera/pixel_format.h>

#include "libcamera/internal/formats.h"
#include "libcamera/internal/log.h"

/**
 * \file v4l2_pixelformat.h
 * \brief V4L2 Pixel Format
 */
namespace libcamera {

LOG_DECLARE_CATEGORY(V4L2)

/**
 * \class V4L2PixelFormat
 * \brief V4L2 pixel format FourCC wrapper
 *
 * The V4L2PixelFormat class describes the pixel format of a V4L2 buffer. It
 * wraps the V4L2 numerical FourCC, and shall be used in all APIs that deal with
 * V4L2 pixel formats. Its purpose is to prevent unintentional confusion of
 * V4L2 and DRM FourCCs in code by catching implicit conversion attempts at
 * compile time.
 *
 * To achieve this goal, construction of a V4L2PixelFormat from an integer value
 * is explicit. To retrieve the integer value of a V4L2PixelFormat, both the
 * explicit value() and implicit uint32_t conversion operators may be used.
 */

namespace {

const std::map<V4L2PixelFormat, PixelFormat> vpf2pf{
	/* RGB formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_RGB24), formats::BGR888 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_BGR24), formats::RGB888 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_RGBA32), formats::ABGR8888 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_ABGR32), formats::ARGB8888 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_ARGB32), formats::BGRA8888 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_BGRA32), formats::RGBA8888 },

	/* YUV packed formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_YUYV), formats::YUYV },
	{ V4L2PixelFormat(V4L2_PIX_FMT_YVYU), formats::YVYU },
	{ V4L2PixelFormat(V4L2_PIX_FMT_UYVY), formats::UYVY },
	{ V4L2PixelFormat(V4L2_PIX_FMT_VYUY), formats::VYUY },

	/* YUV planar formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV16), formats::NV16 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV61), formats::NV61 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV12), formats::NV12 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV21), formats::NV21 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_YUV420), formats::YUV420 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_YUV422P), formats::YUV422 },

	/* Greyscale formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_GREY), formats::R8 },

	/* Bayer formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR8), formats::SBGGR8 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG8), formats::SGBRG8 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG8), formats::SGRBG8 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB8), formats::SRGGB8 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR10), formats::SBGGR10 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG10), formats::SGBRG10 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG10), formats::SGRBG10 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB10), formats::SRGGB10 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR10P), formats::SBGGR10_CSI2P },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG10P), formats::SGBRG10_CSI2P },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG10P), formats::SGRBG10_CSI2P },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB10P), formats::SRGGB10_CSI2P },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR12), formats::SBGGR12 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG12), formats::SGBRG12 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG12), formats::SGRBG12 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB12), formats::SRGGB12 },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR12P), formats::SBGGR12_CSI2P },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG12P), formats::SGBRG12_CSI2P },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG12P), formats::SGRBG12_CSI2P },
	{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB12P), formats::SRGGB12_CSI2P },

	/* Compressed formats. */