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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Raspberry Pi (Trading) Limited
*
* bayer_format.cpp - Class to represent Bayer formats
*/
#include "libcamera/internal/bayer_format.h"
#include <map>
#include <libcamera/transform.h>
/**
* \file bayer_format.h
* \brief Class to represent Bayer formats and manipulate them
*/
namespace libcamera {
/**
* \class BayerFormat
* \brief Class to represent a raw image Bayer format
*
* This class encodes the different Bayer formats in such a way that they can
* be easily manipulated. For example, the bit depth or Bayer order can be
* easily altered - the Bayer order can even be "transformed" in the same
* manner as happens in many sensors when their horizontal or vertical "flip"
* controls are set.
*/
/**
* \enum BayerFormat::Order
* \brief The order of the colour channels in the Bayer pattern
*
* \var BayerFormat::BGGR
* \brief B then G on the first row, G then R on the second row.
* \var BayerFormat::GBRG
* \brief G then B on the first row, R then G on the second row.
* \var BayerFormat::GRBG
* \brief G then R on the first row, B then G on the second row.
* \var BayerFormat::RGGB
* \brief R then G on the first row, G then B on the second row.
*/
/**
* \enum BayerFormat::Packing
* \brief Different types of packing that can be applied to a BayerFormat
*
* \var BayerFormat::None
* \brief No packing
* \var BayerFormat::CSI2Packed
* \brief Format uses MIPI CSI-2 style packing
* \var BayerFormat::IPU3Packed
* \brief Format uses IPU3 style packing
*/
namespace {
const std::map<V4L2PixelFormat, BayerFormat> v4l2ToBayer{
{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR8), { BayerFormat::BGGR, 8, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG8), { BayerFormat::GBRG, 8, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG8), { BayerFormat::GRBG, 8, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB8), { BayerFormat::RGGB, 8, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR10), { BayerFormat::BGGR, 10, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG10), { BayerFormat::GBRG, 10, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG10), { BayerFormat::GRBG, 10, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB10), { BayerFormat::RGGB, 10, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR10P), { BayerFormat::BGGR, 10, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG10P), { BayerFormat::GBRG, 10, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG10P), { BayerFormat::GRBG, 10, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB10P), { BayerFormat::RGGB, 10, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SBGGR10), { BayerFormat::BGGR, 10, BayerFormat::IPU3Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SGBRG10), { BayerFormat::GBRG, 10, BayerFormat::IPU3Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SGRBG10), { BayerFormat::GRBG, 10, BayerFormat::IPU3Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SRGGB10), { BayerFormat::RGGB, 10, BayerFormat::IPU3Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR12), { BayerFormat::BGGR, 12, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG12), { BayerFormat::GBRG, 12, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG12), { BayerFormat::GRBG, 12, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB12), { BayerFormat::RGGB, 12, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR12P), { BayerFormat::BGGR, 12, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG12P), { BayerFormat::GBRG, 12, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG12P), { BayerFormat::GRBG, 12, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB12P), { BayerFormat::RGGB, 12, BayerFormat::CSI2Packed } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SBGGR16), { BayerFormat::BGGR, 16, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGBRG16), { BayerFormat::GBRG, 16, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SGRBG16), { BayerFormat::GRBG, 16, BayerFormat::None } },
{ V4L2PixelFormat(V4L2_PIX_FMT_SRGGB16), { BayerFormat::RGGB, 16, BayerFormat::None } },
};
/* Define a slightly arbitrary ordering so that we can use a std::map. */
struct BayerFormatComparator {
constexpr bool operator()(const BayerFormat &lhs, const BayerFormat &rhs) const
{
if (lhs.bitDepth < rhs.bitDepth)
return true;
else if (lhs.bitDepth > rhs.bitDepth)
return false;
if (lhs.order < rhs.order)
return true;
else if (lhs.order > rhs.order)
return false;
if (lhs.packing < rhs.packing)
return true;
else
return false;
}
};
const std::map<BayerFormat, V4L2PixelFormat, BayerFormatComparator> bayerToV4l2{
{ { BayerFormat::BGGR, 8, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SBGGR8) },
{ { BayerFormat::GBRG, 8, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGBRG8) },
{ { BayerFormat::GRBG, 8, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGRBG8) },
{ { BayerFormat::RGGB, 8, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SRGGB8) },
{ { BayerFormat::BGGR, 10, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SBGGR10) },
{ { BayerFormat::GBRG, 10, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGBRG10) },
{ { BayerFormat::GRBG, 10, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGRBG10) },
{ { BayerFormat::RGGB, 10, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SRGGB10) },
{ { BayerFormat::BGGR, 10, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SBGGR10P) },
{ { BayerFormat::GBRG, 10, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SGBRG10P) },
{ { BayerFormat::GRBG, 10, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SGRBG10P) },
{ { BayerFormat::RGGB, 10, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SRGGB10P) },
{ { BayerFormat::BGGR, 10, BayerFormat::IPU3Packed }, V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SBGGR10) },
{ { BayerFormat::GBRG, 10, BayerFormat::IPU3Packed }, V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SGBRG10) },
{ { BayerFormat::GRBG, 10, BayerFormat::IPU3Packed }, V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SGRBG10) },
{ { BayerFormat::RGGB, 10, BayerFormat::IPU3Packed }, V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SRGGB10) },
{ { BayerFormat::BGGR, 12, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SBGGR12) },
{ { BayerFormat::GBRG, 12, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGBRG12) },
{ { BayerFormat::GRBG, 12, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGRBG12) },
{ { BayerFormat::RGGB, 12, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SRGGB12) },
{ { BayerFormat::BGGR, 12, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SBGGR12P) },
{ { BayerFormat::GBRG, 12, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SGBRG12P) },
{ { BayerFormat::GRBG, 12, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SGRBG12P) },
{ { BayerFormat::RGGB, 12, BayerFormat::CSI2Packed }, V4L2PixelFormat(V4L2_PIX_FMT_SRGGB12P) },
{ { BayerFormat::BGGR, 16, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SBGGR16) },
{ { BayerFormat::GBRG, 16, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGBRG16) },
{ { BayerFormat::GRBG, 16, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SGRBG16) },
{ { BayerFormat::RGGB, 16, BayerFormat::None }, V4L2PixelFormat(V4L2_PIX_FMT_SRGGB16) },
};
} /* namespace */
/**
* \fn BayerFormat::BayerFormat()
* \brief Construct an empty (and invalid) BayerFormat
*/
/**
* \fn BayerFormat::BayerFormat(Order o, uint8_t b, Packing p)
* \brief Construct a BayerFormat from explicit values
* \param[in] o The order of the Bayer pattern
* \param[in] b The bit depth of the Bayer samples
* \param[in] p The type of packing applied to the pixel values
*/
/**
* \brief Construct a BayerFormat from a V4L2PixelFormat
* \param[in] v4l2Format The raw format to convert into a BayerFormat
*/
BayerFormat::BayerFormat(V4L2PixelFormat v4l2Format)
: order(BGGR), packing(None)
{
const auto it = v4l2ToBayer.find(v4l2Format);
if (it == v4l2ToBayer.end())
bitDepth = 0;
else
*this = it->second;
}
/**
* \fn BayerFormat::isValid()
* \brief Return whether a BayerFormat is valid
*/
/**
* \brief Assemble and return a readable string representation of the
* BayerFormat
* \return A string describing the BayerFormat
*/
std::string BayerFormat::toString() const
{
std::string result;
static const char *orderStrings[] = {
"BGGR",
"GBRG",
"GRBG",
"RGGB"
};
if (isValid() && order <= RGGB)
result = orderStrings[order];
else
return "INVALID";
result += "-" + std::to_string(bitDepth);
if (packing == CSI2Packed)
result += "-CSI2P";
else if (packing == IPU3Packed)
result += "-IPU3P";
return result;
}
/**
* \brief Convert a BayerFormat into the corresponding V4L2PixelFormat
* \return The V4L2PixelFormat corresponding to this BayerFormat
*/
V4L2PixelFormat BayerFormat::toV4L2PixelFormat() const
{
const auto it = bayerToV4l2.find(*this);
if (it != bayerToV4l2.end())
return it->second;
return V4L2PixelFormat();
}
/**
* \brief Apply a transform to this BayerFormat
* \param[in] t The transform to apply
*
* Appplying a transform to an image stored in a Bayer format affects the Bayer
* order. For example, performing a horizontal flip on the Bayer pattern
* RGGB causes the RG rows of pixels to become GR, and the GB rows to become BG.
* The transformed image would have a GRBG order. The bit depth and modifiers
* are not affected.
*
* Note that transpositions are ignored as the order of a transpose with
* respect to the flips would have to be defined, and sensors are not expected
* to support transposition.
*
* \return The transformed Bayer format
*/
BayerFormat BayerFormat::transform(Transform t) const
{
BayerFormat result = *this;
/*
* Observe that flipping bit 0 of the Order enum performs a horizontal
* mirror on the Bayer pattern (e.g. RGGB goes to GRBG). Similarly,
* flipping bit 1 performs a vertical mirror operation on it. Hence:
*/
if (!!(t & Transform::HFlip))
result.order = static_cast<Order>(result.order ^ 1);
if (!!(t & Transform::VFlip))
result.order = static_cast<Order>(result.order ^ 2);
return result;
}
/**
* \var BayerFormat::order
* \brief The order of the colour channels in the Bayer pattern
*/
/**
* \var BayerFormat::bitDepth
* \brief The bit depth of the samples in the Bayer pattern
*/
/**
* \var BayerFormat::packing
* \brief Any packing scheme applied to this BayerFormat
*/
} /* namespace libcamera */
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