cv::gapi::GKernelPackage Class Reference

A container class for heterogeneous kernel implementation collections. More...

#include <opencv2/gapi/gkernel.hpp>

Public Member Functions
std::vector< GBackend >	backends () const
	Lists all backends which are included into package. More...
template<typename KImpl >
void	include (const cv::unite_policy up=cv::unite_policy::KEEP)
	Put a new kernel implementation KImpl into package. More...
template<typename KImpl >
bool	includes () const
	Test if a particular kernel implementation KImpl is included in this kernel package. More...
template<typename KAPI >
bool	includesAPI () const
template<typename KAPI >
GBackend	lookup (const GLookupOrder &order={}) const
	Find a kernel (by its API), given the look-up order. More...
void	remove (const GBackend &backend)
	Remove all kernels associated with the given backend from the package. More...
template<typename KAPI >
void	remove ()
	Remove all kernels implementing the given API from the package. More...
std::size_t	size () const
	Returns total number of kernels in the package (across all backends included) More...

Friends
GKernelPackage	combine (const GKernelPackage &lhs, const GKernelPackage &rhs, const cv::unite_policy policy)
	Create a new package based on lhs and rhs, with unity policy defined by policy. More...

Detailed Description

A container class for heterogeneous kernel implementation collections.

GKernelPackage is a special container class which stores kernel implementations. Objects of this class are created and passed to cv::GComputation::compile() to specify which kernels to use in the compiled graph. GKernelPackage may contain kernels of different backends, e.g. be heterogeneous.

The most easy way to create a kernel package is to use function cv::gapi::kernels(). This template functions takes kernel implementations in form of type list (variadic template) and generates a kernel package atop of that.

Kernel packages can be also generated programatically, starting with an empty package (created with the default constructor) and then by populating it with kernels via call to GKernelPackage::include(). Note this method is also a template one since G-API kernel implementations are types, not objects.

Finally, two kernel packages can be combined into a new one with function cv::gapi::combine(). There are different rules apply to this process, see also cv::gapi::unite_policy for details.

Member Function Documentation

backends()

std::vector<GBackend> cv::gapi::GKernelPackage::backends

(

)

const

Lists all backends which are included into package.

Returns

vector of backends

include()

template<typename KImpl >

void cv::gapi::GKernelPackage::include ( const cv::unite_policy  up = cv::unite_policy::KEEP )

inline

Put a new kernel implementation KImpl into package.

Parameters

up	unite policy to use. If the package has already implementation for this kernel (probably from another backend), and cv::unite_policy::KEEP is passed, the existing implementation remains in package; on cv::unite_policy::REPLACE all other existing implementations are first dropped from the package.

includes()

template<typename KImpl >

bool cv::gapi::GKernelPackage::includes ( ) const

inline

Test if a particular kernel implementation KImpl is included in this kernel package.

See also

includesAPI()

Returns

true if there is such kernel, false otherwise.

includesAPI()

template<typename KAPI >

bool cv::gapi::GKernelPackage::includesAPI ( ) const

inline

Check if package contains ANY implementation of a kernel API by API type.

lookup()

template<typename KAPI >

GBackend cv::gapi::GKernelPackage::lookup ( const GLookupOrder &  order = {} ) const

inline

Find a kernel (by its API), given the look-up order.

If order is empty, returns first suitable implementation. Throws if nothing found.

Returns

Backend which hosts matching kernel implementation.

See also

cv::gapi::lookup_order

remove() [1/2]

void cv::gapi::GKernelPackage::remove

(

const GBackend &

backend

)

Remove all kernels associated with the given backend from the package.

Does nothing if there's no kernels of this backend in the package.

Parameters

backend

backend which kernels to remove

remove() [2/2]

template<typename KAPI >

void cv::gapi::GKernelPackage::remove ( )

inline

Remove all kernels implementing the given API from the package.

Does nothing if there's no kernels implementing the given interface.

size()

std::size_t cv::gapi::GKernelPackage::size

(

)

const

Returns total number of kernels in the package (across all backends included)

Returns

a number of kernels in the package

Friends And Related Function Documentation

combine

GKernelPackage combine ( const GKernelPackage &  lhs, const GKernelPackage &  rhs, const cv::unite_policy  policy  )

friend

Create a new package based on lhs and rhs, with unity policy defined by policy.

Parameters

lhs	"Left-hand-side" package in the process
rhs	"Right-hand-side" package in the process
policy	Unite policy which is used in case of conflicts – when the same kernel API is implemented in both packages by different backends; cv::unite_policy::KEEP keeps both implementation in the resulting package, while cv::unite_policy::REPLACE gives precedence two kernels from "Right-hand-side".

Returns

a new kernel package.

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The documentation for this class was generated from the following file:

• opencv2/gapi/gkernel.hpp