Non-owning view on a 2d-plane of data. More...

#include <cvb/block.hpp>

Classes
class	Column
	A single column. More...

class	Row
	A single row. More...

Public Member Functions
	Block (ACCESSTRAIT access, Cvb::Size2D< int > size)

auto	SubBlock (Cvb::Rect< int > aoi) const -> Block< T, decltype(this->Access().NewMoved(Cvb::Rect< int >{}))>
	Creates a new sub Block from this block.

CVB_FORCE_INLINE const PixelType &	operator() (int x, int y) const noexcept
	Coordinate pixel access operator.

CVB_FORCE_INLINE PixelType &	operator() (int x, int y) noexcept
	Coordinate pixel access operator.

template<class FromPixelType>
CVB_FORCE_INLINE auto	Set (int x, int y, const FromPixelType &value) noexcept -> std::enable_if_t<!std::is_convertible< remove_cvref_t< FromPixelType >, remove_cvref_t< PixelType > >::value, void >
	Coordinate setter.

CVB_FORCE_INLINE void	Set (int x, int y, const PixelType &value) noexcept
	Coordinate setter.

CVB_FORCE_INLINE const PixelType &	operator[] (int idx) const noexcept
	Index pixel access operator.

CVB_FORCE_INLINE PixelType &	operator[] (int idx) noexcept
	Coordinate pixel access operator.

template<class FromPixelType>
CVB_FORCE_INLINE auto	Set (int idx, const FromPixelType &value) noexcept -> std::enable_if_t<!std::is_convertible< remove_cvref_t< FromPixelType >, remove_cvref_t< PixelType > >::value, void >
	Index setter.

CVB_FORCE_INLINE void	Set (int idx, const PixelType &value) noexcept
	Index setter.

Row	RowAt (int y) const noexcept
	Gets the Block::Row at y.

Column	ColumnAt (int x) const noexcept
	Gets the Block::Column at x.

Public Member Functions inherited from BlockBase< ACCESSTRAIT >
CVB_FORCE_INLINE const ACCESSTRAIT &	Access () const noexcept
	Gets the pixel access.

CVB_FORCE_INLINE ACCESSTRAIT &	Access () noexcept
	Gets the pixel access.

CVB_FORCE_INLINE size_t	Length () const noexcept
	Gets the total number of pixels in this block.

CVB_FORCE_INLINE Size2D< int >	Size () const noexcept
	Gets the size of this block.

CVB_FORCE_INLINE int	Width () const noexcept
	Gets the width of this block.

CVB_FORCE_INLINE int	Height () const noexcept
	Gets the height of this block.

bool	Valid () const noexcept
	Gets whether this block is valid.

Static Public Attributes
static constexpr const bool	IsPixelTypeMutable = true
	! Indicates whether the returned values of operator(x,y) or operator[idx] are mutable.

Related Symbols
(Note that these are not member symbols.)
template<class T>
using	ArrayPlaneBlock = Block<T, ArrayAccess>
	A Cvb::Block of a contiguous plane.

template<class T>
using	LinearPlaneBlock = Block<T, LinearAccess>
	A Cvb::Block of a linear plane.

template<class T>
using	VpatPlaneBlock = Block<T, VpatAccess>
	A Cvb::Block of a VPAT plane.

template<class T, size_t K>
using	ScatterBlock = Block<T, ScatterAccess<K>>
	A Cvb::Block of variant planes.

template<class VISITOR>
auto	Visit (VISITOR &&visitor, const PointCloud &cloud)
	Creates a Cvb::Block based on the cloud object's access trait and pixel type and calls the given visitor with it.

template<class T, class VISITOR>
auto	VisitAs (VISITOR &&visitor, const PointCloud &cloud)
	Creates a Cvb::Block based on the cloud object's access trait and given pixel type T and calls the given visitor with it.

template<class VISITOR, class... PLNS>
auto	Visit (VISITOR &&visitor, const Plane &plane, const PLNS &...planes)
	Creates a Cvb::Block based on the plane and planes objects' access traits and pixel type and calls the given visitor with it.

template<class T, class VISITOR, class... PLNS>
auto	VisitAs (VISITOR &&visitor, const Plane &plane, const PLNS &...planes)
	Creates a Cvb::Block based on the plane and planes objects' access traits and given pixel type T and calls the given visitor with it.

template<class VISITOR, class... PLANEARGS>
auto	Visit (VISITOR &&visitor, const ImagePlane &plane, const PLANEARGS &...planes)
	Creates `Cvb::Block`s based on the planes objects' access traits and pixel type, and calls the given visitor with them.

template<class PIXEL_TYPE, class VISITOR, class... PLANEARGS>
auto	VisitAs (VISITOR &&visitor, const ImagePlane &plane, const PLANEARGS &...planes)
	Creates `Cvb::Block`s based on the planes objects' access traits and PIXEL_TYPE and calls the given visitor with them. When the PIXEL_TYPE is compile-time known, this overload is useful to avoid unnecessary template instantiations.

template<class VISITOR, class PLANE_T, class... PLANEARGS, std::enable_if_t< std::is_same< typename PlaneTraits< PLANE_T >::PlaneT, PLANE_T >::value, int > = 0>
auto	Visit (VISITOR &&visitor, const PLANE_T &plane, const PLANEARGS &...planes)
	Creates a Cvb::Block based on the plane and planes objects' access traits and pixel type and calls the given visitor with it.

template<class T, class VISITOR, class PLANE_T, class... PLANEARGS, std::enable_if_t< std::is_same< typename PlaneTraits< PLANE_T >::PlaneT, PLANE_T >::value, int > = 0>
auto	VisitAs (VISITOR &&visitor, const PLANE_T &plane, const PLANEARGS &...planes)
	Creates `Cvb::Block`s based on the planes objects' access traits and T and calls the given visitor with them. When the T is compile-time known, this variant is useful to avoid unnecessary template instantiations.

Detailed Description

template<class T, class ACCESSTRAIT>
class Cvb::Block< T, ACCESSTRAIT >

Non-owning view on a 2d-plane of data.

Template Parameters

T	Plane value type.
ACCESSTRAIT	Access Trait to access a coordinate.

Constructor & Destructor Documentation

◆ Block()

template<class T, class ACCESSTRAIT>

Block	(	ACCESSTRAIT	access,
		Cvb::Size2D< int >	size )

inlineexplicit

Member Function Documentation

◆ ColumnAt()

template<class T, class ACCESSTRAIT>

Column ColumnAt ( int x ) const

inlinenoexcept

Gets the Block::Column at x.

Precondition: x must be between 0 and less than the allowed width.

Parameters

[in] x Pixel column.

Returns: Column object at line x.

◆ operator()() [1/2]

template<class T, class ACCESSTRAIT>

CVB_FORCE_INLINE const PixelType & operator()	(	int	x,
		int	y ) const

inlinenoexcept

Coordinate pixel access operator.

Precondition: x and y inside Size()
Valid() == true

Parameters

[in]	x	X coordinate coefficient in pixels.
[in]	y	Y coordinate coefficient in pixels.

Returns: Const reference to pixel value.

◆ operator()() [2/2]

template<class T, class ACCESSTRAIT>

CVB_FORCE_INLINE PixelType & operator()	(	int	x,
		int	y )

inlinenoexcept

Coordinate pixel access operator.

Precondition: x and y inside Size()
Valid() == true

Parameters

[in]	x	X coordinate coefficient in pixels.
[in]	y	Y coordinate coefficient in pixels.

Returns: Mutable reference to pixel value.

◆ operator[]() [1/2]

template<class T, class ACCESSTRAIT>

CVB_FORCE_INLINE const PixelType & operator[] ( int idx ) const

inlinenoexcept

Index pixel access operator.

Precondition: idx between 0..Size().Width()*Size().Height()
Valid() == true

Parameters

[in] idx Pixel index in pixels.

Returns: Const reference to pixel value.

◆ operator[]() [2/2]

template<class T, class ACCESSTRAIT>

CVB_FORCE_INLINE PixelType & operator[] ( int idx )

inlinenoexcept

Coordinate pixel access operator.

Precondition: idx between 0..Size().Width()*Size().Height()
Valid() == true

Parameters

[in] idx Pixel index in pixels.

Returns: Mutable reference to pixel value.

◆ RowAt()

template<class T, class ACCESSTRAIT>

Row RowAt ( int y ) const

inlinenoexcept

Gets the Block::Row at y.

Precondition: y must be between 0 and less than the allowed height.

Parameters

[in] y Pixel row.

Returns: Row object at line y.

◆ Set() [1/4]

template<class T, class ACCESSTRAIT>

template<class FromPixelType>

CVB_FORCE_INLINE auto Set	(	int	idx,
		const FromPixelType &	value ) -> std::enable_if_t<!std::is_convertible<remove_cvref_t<FromPixelType>, remove_cvref_t<PixelType>>::value, void>

inlinenoexcept

Index setter.

Supports any input type for value for which get<I>() is overloaded and has sufficiently many values.

Precondition: idx between 0..Size().Width()*Size().Height()
Valid() == true

Parameters

[in]	idx	Pixel index in pixels.
[in]	value	New pixel value.

◆ Set() [2/4]

template<class T, class ACCESSTRAIT>

CVB_FORCE_INLINE void Set	(	int	idx,
		const PixelType &	value )

inlinenoexcept

Index setter.

Supports any input type for value for which get<I>() is overloaded and has sufficiently many values.

Precondition: idx between 0..Size().Width()*Size().Height()
Valid() == true

Parameters

[in]	idx	Pixel index in pixels.
[in]	value	New pixel value.

◆ Set() [3/4]

template<class T, class ACCESSTRAIT>

template<class FromPixelType>

CVB_FORCE_INLINE auto Set	(	int	x,
		int	y,
		const FromPixelType &	value ) -> std::enable_if_t<!std::is_convertible<remove_cvref_t<FromPixelType>, remove_cvref_t<PixelType>>::value, void>

inlinenoexcept

Coordinate setter.

Supports any input type for value for which get<I>() is overloaded and has sufficiently many values.

Precondition: x and y inside Size()
Valid() == true

Parameters

[in]	x	X coordinate coefficient in pixels.
[in]	y	Y coordinate coefficient in pixels.
[in]	value	New pixel value.

◆ Set() [4/4]

template<class T, class ACCESSTRAIT>

CVB_FORCE_INLINE void Set	(	int	x,
		int	y,
		const PixelType &	value )

inlinenoexcept

Coordinate setter.

Supports any input type for value for which get<I>() is overloaded and has sufficiently many values.

Precondition: x and y inside Size()
Valid() == true

Parameters

[in]	x	X coordinate coefficient in pixels.
[in]	y	Y coordinate coefficient in pixels.
[in]	value	New pixel value.

◆ SubBlock()

template<class T, class ACCESSTRAIT>

auto SubBlock ( Cvb::Rect< int > aoi ) const -> Block<T, decltype(this->Access().NewMoved(Cvb::Rect<int>{}))>

inline

Creates a new sub Block from this block.

Precondition: Valid() == true aoi is inside Size() and not empty

Parameters

[in] aoi Area of interest of this block.

Returns: New Block object of the given aoi.

Exceptions

std::logic_error	if this not Valid().
std::length_error	if aoi is outside bounds.

Friends And Related Symbol Documentation

◆ ArrayPlaneBlock

template<class T, class ACCESSTRAIT>

template<class T>

using ArrayPlaneBlock = Block<T, ArrayAccess>

A Cvb::Block of a contiguous plane.

Template Parameters

T	Plane value type.

◆ LinearPlaneBlock

template<class T, class ACCESSTRAIT>

template<class T>

using LinearPlaneBlock = Block<T, LinearAccess>

A Cvb::Block of a linear plane.

Template Parameters

T	Plane value type.

◆ ScatterBlock

template<class T, class ACCESSTRAIT>

template<class T, size_t K>

using ScatterBlock = Block<T, ScatterAccess<K>>

A Cvb::Block of variant planes.

Template Parameters

T	Plane value type.

◆ Visit() [1/4]

template<class VISITOR, class... PLANEARGS>

auto Visit	(	VISITOR &&	visitor,
		const ImagePlane &	plane,
		const PLANEARGS &...	planes )

Creates Cvb::Blocks based on the planes objects' access traits and pixel type, and calls the given visitor with them.

ImagePlane

The planes must have the same pixel type. If all planes support Cvb::ArrayAccess, then all blocks forwarded to the visitor are of type Cvb::ArrayPlaneBlock, if all are of Cvb::LinearAccess, all blocks will be of type Cvb::LinearPlaneBlock, otherwise of type Cvb::VpatPlaneBlock.

Template Parameters

VISITOR Callable that is called with the typed Cvb::Block.

Parameters

[in]	visitor	Callable of signature `auto(Block<T,ACCESS_TRAIT>, ...)`.
[in]	plane	The first plane to visit.
[in]	planes	Planes to create typed `Cvb::Block`s for that will be forwarded to the visitor.

Returns: Whatever visitor returns.

Exceptions

std::runtime_error	if no pixel type could be matched.
std::domain_error	if properties of the planes differ.

◆ Visit() [2/4]

template<class VISITOR, class... PLNS>

auto Visit	(	VISITOR &&	visitor,
		const Plane &	plane,
		const PLNS &...	planes )

Creates a Cvb::Block based on the plane and planes objects' access traits and pixel type and calls the given visitor with it.

Plane

Remarks: Currently only point clouds are supported, where LinearAccess is supported. If only a single plane is given, either a ArrayPlaneBlock<T> or a LinearPlaneBlock<T> is given as argument to the visitor.; If more than one plane is given, the visitor must either be callable with a single Block or with exactly as many Blocks as there are plane arguments. In the single argument case, the Block will either be a ArrayPlaneBlock<LinearValue<T, NumPlanes>>, LinearPlaneBlock<LinearValue<T, NumPlanes>> or a ScatterBlock<T, NumPlanes>. In the multiple argument case, the Blocks will all either be ArrayPlaneBlock<T> or LinearPlaneBlock<T> depending on whether all the planes' memory is continuous or not.; If the planes are interleaved in the argument order, a ArrayPlaneBlock<LinearValue<T, NumPlanes>> or LinearPlaneBlock<LinearValue<T, NumPlanes>> is used, providing performance optimizations. Otherwise ScatterBlock<RefValue<T, NumPlanes>, NumPlanes> is used.

Template Parameters

VISITOR The visitor functor.

Parameters

[in]	visitor	The visiting functor. May either have one argument or exactly as many arguments as planes are given.
[in]	plane	The first plane to visit.
[in]	planes	More planes to visit.

Returns: Whatever visitor returns.

Exceptions

std::domain_error if properties of the planes differ.

◆ Visit() [3/4]

template<class VISITOR, class PLANE_T, class... PLANEARGS, std::enable_if_t< std::is_same< typename PlaneTraits< PLANE_T >::PlaneT, PLANE_T >::value, int > = 0>

auto Visit	(	VISITOR &&	visitor,
		const PLANE_T &	plane,
		const PLANEARGS &...	planes )

Creates a Cvb::Block based on the plane and planes objects' access traits and pixel type and calls the given visitor with it.

Remarks: If more than one plane is given, the visitor must either be callable with a single Block or with exactly as many Blocks as there are plane arguments. In the single argument case, the Block will either be a ArrayPlaneBlock<LinearValue<T, NumPlanes>>, LinearPlaneBlock<LinearValue<T, NumPlanes>> or a ScatterBlock<T, NumPlanes>. In the multiple argument case, the Blocks will all either be ArrayPlaneBlock<T> or LinearPlaneBlock<T> depending on whether all the planes' memory is continuous or not. If PlaneTraits<PLANE_T>::HasVpat is true, VpatPlaneBlock<LinearValue<T, NumPlanes> or VpatPlaneBlock<T> are additionally possible block types.; If the planes are interleaved in the argument order, a ArrayPlaneBlock<LinearValue<T, NumPlanes>>, LinearPlaneBlock<LinearValue<T, NumPlanes>> or VpatPlaneBlock<LinearValue<T, NumPlanes> is used, providing performance benefits. If the planes are not interleaved ScatterBlock<RefValue<T, NumPlanes>, NumPlanes> is used.; The possible element types T are taken from PlaneTraits<PLANE_T>::TypeList.

Template Parameters

VISITOR The visitor functor.

Parameters

[in]	visitor	The visiting functor. May either have one argument or exactly as many arguments as planes are given.
[in]	plane	The first plane to visit.
[in]	planes	More planes to visit.

Returns: Whatever visitor returns.

Exceptions

std::domain_error if properties of the planes differ.

◆ Visit() [4/4]

template<class VISITOR>

auto Visit	(	VISITOR &&	visitor,
		const PointCloud &	cloud )

Creates a Cvb::Block based on the cloud object's access trait and pixel type and calls the given visitor with it.

PointCloud

Remarks: Currently only point clouds are supported, where LinearAccess is supported. The block will either be a ArrayPlaneBlock<LinearValue<T, 3>>, LinearPlaneBlock<LinearValue<T, 3>> or a ScatterBlock<T, 3>. If the x, y and z planes are interleaved in this order, a ArrayPlaneBlock<LinearValue<T, 3>> or LinearPlaneBlock<LinearValue<T, 3>> is used, providing performance optimizations. Otherwise ScatterBlock<T, 3> is used.

Template Parameters

VISITOR Callable that is called with the typed CvbConcepts::Block.

Parameters

[in]	visitor	Callable of signature auto(Block<T,ACCESS_TRAIT>).
[in]	cloud	PointCloud to create typed CvbConcepts::Block for.

Returns: Whatever visitor returns.

Exceptions

std::runtime_error	if no pixel type could be matched.
std::domain_error	if properties of the planes differ.

◆ VisitAs() [1/4]

template<class PIXEL_TYPE, class VISITOR, class... PLANEARGS>

auto VisitAs	(	VISITOR &&	visitor,
		const ImagePlane &	plane,
		const PLANEARGS &...	planes )

Creates Cvb::Blocks based on the planes objects' access traits and PIXEL_TYPE and calls the given visitor with them. When the PIXEL_TYPE is compile-time known, this overload is useful to avoid unnecessary template instantiations.

ImagePlane

The planes must have the same pixel type. If all planes support Cvb::ArrayAccess, then all blocks forwarded to the visitor are of type Cvb::ArrayPlaneBlock, if all are of Cvb::LinearAccess, all blocks will be of type Cvb::LinearPlaneBlock, otherwise of type Cvb::VpatPlaneBlock.

Template Parameters

PIXEL_TYPE	The pixel type of the planes.
VISITOR	Callable that is called with the typed Cvb::Block.

Parameters

[in]	visitor	Callable of signature `auto(Block<PIXEL_TYPE,ACCESS_TRAIT>, ...)`.
[in]	plane	The first plane to visit.
[in]	planes	Planes to create typed `Cvb::Block`s for that will be forwarded to the visitor.

Returns: Whatever visitor returns.

Exceptions

std::runtime_error	if no pixel type could be matched
std::domain_error	if properties of the planes differ.

◆ VisitAs() [2/4]

template<class T, class VISITOR, class... PLNS>

auto VisitAs	(	VISITOR &&	visitor,
		const Plane &	plane,
		const PLNS &...	planes )

Creates a Cvb::Block based on the plane and planes objects' access traits and given pixel type T and calls the given visitor with it.

Plane

Remarks: Currently only point clouds are supported, where LinearAccess is supported. The visitor must be callable with a single Block<PointT, AccessTrait> as argument.; If the planes are interleaved in the argument order, a ArrayPlaneBlock<PointT> or LinearPlaneBlock<PointT> is used, providing performance optimizations. Otherwise ScatterBlock<PointT, N> is used.; If T is an arithmetic type, the behavior is equivalent to Visit, except the component type is not dispatched and instead T is used. In this case, PointT will be LinearValue<T, NumPlanes> or RefValue<T, NumPlanes>. Otherwise T will be used as PointT directly.

Template Parameters

VISITOR The visitor functor.

Parameters

[in]	visitor	The visiting functor. May either have one argument or exactly as many arguments as planes are given.
[in]	plane	The first plane to visit.
[in]	planes	More planes to visit.

Returns: Whatever visitor returns.

Exceptions

std::domain_error if properties of the planes differ.

◆ VisitAs() [3/4]

template<class T, class VISITOR, class PLANE_T, class... PLANEARGS, std::enable_if_t< std::is_same< typename PlaneTraits< PLANE_T >::PlaneT, PLANE_T >::value, int > = 0>

auto VisitAs	(	VISITOR &&	visitor,
		const PLANE_T &	plane,
		const PLANEARGS &...	planes )

Creates Cvb::Blocks based on the planes objects' access traits and T and calls the given visitor with them. When the T is compile-time known, this variant is useful to avoid unnecessary template instantiations.

Remarks: If the planes are interleaved in the argument order, a ArrayPlaneBlock<PointT> or LinearPlaneBlock<PointT> is used, providing performance benefits. If PlaneTraits<PLANE_T>::HasVpat is true and any plane does not provide Cvb::LinearAccess, Cvb::VpatPlaneBlock is used. If the planes are not interleaved ScatterBlock<PointT, N> is used.; If T is an arithmetic type, the behavior is equivalent to Visit, except the component type is not dispatched and instead T is used. In this case, PointT will be LinearValue<T, NumPlanes> or RefValue<T, NumPlanes>. Otherwise T will be used as PointT directly.

Template Parameters

T	The element type of the planes.
VISITOR	The visitor functor.

Parameters

[in]	visitor	The visiting functor. May either have one argument or exactly as many arguments as planes are given.
[in]	plane	The first plane to visit.
[in]	planes	More planes to visit.

Returns: Whatever visitor returns.

Exceptions

std::runtime_error	if no pixel type could be matched
std::domain_error	if properties of the planes differ.

◆ VisitAs() [4/4]

template<class T, class VISITOR>

auto VisitAs	(	VISITOR &&	visitor,
		const PointCloud &	cloud )

Creates a Cvb::Block based on the cloud object's access trait and given pixel type T and calls the given visitor with it.

PointCloud

Remarks: Currently only point clouds are supported, where LinearAccess is supported. The block will either be a ArrrayPlaneBlock<PointT>, LinearPlaneBlock<PointT> or a ScatterBlock<PointT, 3>. If the x, y and z planes are interleaved in this order, a ArrayPlaneBlock<PointT> or LinearPlaneBlock<PointT> is used, providing superior performance. Otherwise ScatterBlock<PointT, 3> is used.; If T is an arithmetic type, the behavior is equivalent to Visit, except the component type is not dispatched and instead T is used. In this case, PointT will be LinearValue<T, 3> or RefValue<T, 3>. Otherwise T will be used as PointT directly.

Template Parameters

T	Type of the pixel, that can be accessed through the Block.
VISITOR	Callable that is called with the typed CvbConcepts::Block.

Parameters

[in]	visitor	Callable of signature auto(Block<T,ACCESS_TRAIT>).
[in]	cloud	PointCloud to create typed CvbConcepts::Block for.

Returns: Whatever visitor returns.

Exceptions

std::runtime_error	if no pixel type could be matched.
std::domain_error	if properties of the planes differ.

◆ VpatPlaneBlock

template<class T, class ACCESSTRAIT>

template<class T>

using VpatPlaneBlock = Block<T, VpatAccess>

A Cvb::Block of a VPAT plane.

Template Parameters

T	Plane value type.

Classes

Public Member Functions

Static Public Attributes

Related Symbols

Detailed Description

Constructor & Destructor Documentation

◆ Block()

Member Function Documentation

◆ ColumnAt()

◆ operator()() [1/2]

◆ operator()() [2/2]

◆ operator[]() [1/2]

◆ operator[]() [2/2]

◆ RowAt()

◆ Set() [1/4]

◆ Set() [2/4]

◆ Set() [3/4]

◆ Set() [4/4]

◆ SubBlock()

Friends And Related Symbol Documentation

◆ ArrayPlaneBlock

◆ LinearPlaneBlock

◆ ScatterBlock

◆ Visit() [1/4]

◆ Visit() [2/4]

◆ Visit() [3/4]

◆ Visit() [4/4]

◆ VisitAs() [1/4]

◆ VisitAs() [2/4]

◆ VisitAs() [3/4]

◆ VisitAs() [4/4]

◆ VpatPlaneBlock