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authorNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-08-06 14:36:23 +0200
committerNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-08-16 13:50:03 +0200
commit0b9d8eb265a16a0dda650700759066b714f8fd0c (patch)
tree16ef4c028aa85cfbebeac4f8964e9f631293e4cb /test/media_device/media_device_test.cpp
parentef5f5c4db05e5d88d58b0d565f7716c59751b991 (diff)
libcamera: pipeline_handler: Mark controls() and properties() as const operations
Reading the controls and properties does not modify the pipeline's state and can be marked as const operations. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'test/media_device/media_device_test.cpp')
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generated by cgit v1.2.1 (git 2.18.0) at 2025-01-11 15:31:04 +0000
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2021, Raspberry Pi (Trading) Limited
 *
 * color_space.cpp - color spaces.
 */

#include <libcamera/color_space.h>

#include <algorithm>
#include <array>
#include <map>
#include <sstream>
#include <utility>

/**
 * \file color_space.h
 * \brief Class and enums to represent color spaces
 */

namespace libcamera {

/**
 * \class ColorSpace
 * \brief Class to describe a color space
 *
 * The ColorSpace class defines the color primaries, the transfer function,
 * the Y'CbCr encoding associated with the color space, and the range
 * (sometimes also referred to as the quantisation) of the color space.
 *
 * Certain combinations of these fields form well-known standard color
 * spaces such as "JPEG" or "REC709".
 *
 * In the strictest sense a "color space" formally only refers to the
 * color primaries and white point. Here, however, the ColorSpace class
 * adopts the common broader usage that includes the transfer function,
 * Y'CbCr encoding method and quantisation.
 *
 * For more information on the specific color spaces described here, please
 * see:
 *
 * - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-srgb">sRGB</a>
 * - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-jpeg">JPEG</a>
 * - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-smpte-170m">SMPTE 170M</a>
 * - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-rec709">Rec.709</a>
 * - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-bt2020">Rec.2020</a>
 */

/**
 * \enum ColorSpace::Primaries
 * \brief The color primaries for this color space
 *
 * \var ColorSpace::Primaries::Raw
 * \brief These are raw colors directly from a sensor, the primaries are
 * unspecified
 *
 * \var ColorSpace::Primaries::Smpte170m
 * \brief SMPTE 170M color primaries
 *
 * \var ColorSpace::Primaries::Rec709
 * \brief Rec.709 color primaries
 *
 * \var ColorSpace::Primaries::Rec2020
 * \brief Rec.2020 color primaries
 */

/**
 * \enum ColorSpace::TransferFunction
 * \brief The transfer function used for this color space
 *
 * \var ColorSpace::TransferFunction::Linear
 * \brief This color space uses a linear (identity) transfer function
 *
 * \var ColorSpace::TransferFunction::Srgb
 * \brief sRGB transfer function
 *
 * \var ColorSpace::TransferFunction::Rec709
 * \brief Rec.709 transfer function
 */

/**
 * \enum ColorSpace::YcbcrEncoding
 * \brief The Y'CbCr encoding
 *
 * \var ColorSpace::YcbcrEncoding::None
 * \brief There is no defined Y'CbCr encoding (used for non-YUV formats)
 *
 * \var ColorSpace::YcbcrEncoding::Rec601
 * \brief Rec.601 Y'CbCr encoding
 *
 * \var ColorSpace::YcbcrEncoding::Rec709
 * \brief Rec.709 Y'CbCr encoding
 *
 * \var ColorSpace::YcbcrEncoding::Rec2020
 * \brief Rec.2020 Y'CbCr encoding
 */

/**
 * \enum ColorSpace::Range
 * \brief The range (sometimes "quantisation") for this color space
 *
 * \var ColorSpace::Range::Full
 * \brief This color space uses full range pixel values
 *
 * \var ColorSpace::Range::Limited
 * \brief This color space uses limited range pixel values, being
 * 16 to 235 for Y' and 16 to 240 for Cb and Cr (8 bits per sample)
 * or 64 to 940 for Y' and 16 to 960 for Cb and Cr (10 bits)
 */

/**
 * \fn ColorSpace::ColorSpace(Primaries p, TransferFunction t, Encoding e, Range r)
 * \brief Construct a ColorSpace from explicit values
 * \param[in] p The color primaries
 * \param[in] t The transfer function for the color space
 * \param[in] e The Y'CbCr encoding
 * \param[in] r The range of the pixel values in this color space
 */

/**
 * \brief Assemble and return a readable string representation of the
 * ColorSpace
 *
 * If the color space matches a standard ColorSpace (such as ColorSpace::Jpeg)