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authorChristian Rauch <Rauch.Christian@gmx.de>2022-07-05 10:55:48 +0100
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-07-19 14:21:54 +0300
commit1c4d4801850559d6f919eef5c2ffbaf7675dbc46 (patch)
treed1686453c2d047565b9708bc9e03d375fcfa8578 /test/signal-threads.cpp
parentef77e2637985b61dc99669b4396647ad13acb204 (diff)
libcamera: controls: Use std::optional to handle invalid control values
Previously, ControlList::get<T>() would use default constructed objects to indicate that a ControlList does not have the requested Control. This has several disadvantages: 1) It requires types to be default constructible, 2) it does not differentiate between a default constructed object and an object that happens to have the same state as a default constructed object. std::optional<T> additionally stores the information if the object is valid or not, and therefore is more expressive than a default constructed object. Signed-off-by: Christian Rauch <Rauch.Christian@gmx.de> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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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/base/log.h>

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

#include "libcamera/internal/formats.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, V4L2PixelFormat::Info> vpf2pf{
	/* RGB formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_RGB565),
		{ formats::RGB565, "16-bit RGB 5-6-5" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_RGB565X),
		{ formats::RGB565_BE, "16-bit RGB 5-6-5 BE" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_RGB24),
		{ formats::BGR888, "24-bit RGB 8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_BGR24),
		{ formats::RGB888, "24-bit BGR 8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_XBGR32),
		{ formats::XRGB8888, "32-bit BGRX 8-8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_XRGB32),
		{ formats::BGRX8888, "32-bit XRGB 8-8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_RGBX32),
		{ formats::XBGR8888, "32-bit RGBX 8-8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_BGRX32),
		{ formats::RGBX8888, "32-bit XBGR 8-8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_RGBA32),
		{ formats::ABGR8888, "32-bit RGBA 8-8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_ABGR32),
		{ formats::ARGB8888, "32-bit BGRA 8-8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_ARGB32),
		{ formats::BGRA8888, "32-bit ARGB 8-8-8-8" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_BGRA32),
		{ formats::RGBA8888, "32-bit ABGR 8-8-8-8" } },

	/* YUV packed formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_YUYV),
		{ formats::YUYV, "YUYV 4:2:2" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_YVYU),
		{ formats::YVYU, "YVYU 4:2:2" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_UYVY),
		{ formats::UYVY, "UYVY 4:2:2" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_VYUY),
		{ formats::VYUY, "VYUY 4:2:2" } },

	/* YUV planar formats. */
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV16),
		{ formats::NV16, "Y/CbCr 4:2:2" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV16M),
		{ formats::NV16, "Y/CbCr 4:2:2 (N-C)" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV61),
		{ formats::NV61, "Y/CrCb 4:2:2" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV61M),
		{ formats::NV61, "Y/CrCb 4:2:2 (N-C)" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV12),
		{ formats::NV12, "Y/CbCr 4:2:0" } },
	{ V4L2PixelFormat(V4L2_PIX_FMT_NV12M),