github.com/kaydxh/golang@v0.0.131/pkg/gocv/cgo/third_path/opencv4/include/opencv2/gapi/gmetaarg.hpp (about)

     1  // This file is part of OpenCV project.
     2  // It is subject to the license terms in the LICENSE file found in the top-level directory
     3  // of this distribution and at http://opencv.org/license.html.
     4  //
     5  // Copyright (C) 2018 Intel Corporation
     6  
     7  
     8  #ifndef OPENCV_GAPI_GMETAARG_HPP
     9  #define OPENCV_GAPI_GMETAARG_HPP
    10  
    11  #include <vector>
    12  #include <type_traits>
    13  
    14  #include <opencv2/gapi/util/util.hpp>
    15  #include <opencv2/gapi/util/variant.hpp>
    16  
    17  #include <opencv2/gapi/gmat.hpp>
    18  #include <opencv2/gapi/gscalar.hpp>
    19  #include <opencv2/gapi/garray.hpp>
    20  #include <opencv2/gapi/gopaque.hpp>
    21  #include <opencv2/gapi/gframe.hpp>
    22  
    23  namespace cv
    24  {
    25  // FIXME: Rename to GMeta?
    26  // FIXME: user shouldn't deal with it - put to detail?
    27  // GMetaArg is an union type over descriptions of G-types which can serve as
    28  // GComputation's in/output slots.
    29  //
    30  // GMetaArg objects are passed as arguments to GComputation::compile()
    31  // to specify which data a compiled computation should be specialized on.
    32  // For manual compile(), user must supply this metadata, in case of apply()
    33  // this metadata is taken from arguments computation should operate on.
    34  //
    35  // The first type (monostate) is equal to "uninitialized"/"unresolved" meta.
    36  using GMetaArg = util::variant
    37      < util::monostate
    38      , GMatDesc
    39      , GScalarDesc
    40      , GArrayDesc
    41      , GOpaqueDesc
    42      , GFrameDesc
    43      >;
    44  GAPI_EXPORTS std::ostream& operator<<(std::ostream& os, const GMetaArg &);
    45  
    46  using GMetaArgs = std::vector<GMetaArg>;
    47  
    48  namespace detail
    49  {
    50      // These traits are used by GComputation::compile()
    51  
    52      // FIXME: is_constructible<T> doesn't work as variant doesn't do any SFINAE
    53      // in its current template constructor
    54  
    55      template<typename T> struct is_meta_descr    : std::false_type {};
    56      template<> struct is_meta_descr<GMatDesc>    : std::true_type {};
    57      template<> struct is_meta_descr<GScalarDesc> : std::true_type {};
    58      template<> struct is_meta_descr<GArrayDesc>  : std::true_type {};
    59      template<> struct is_meta_descr<GOpaqueDesc> : std::true_type {};
    60  
    61      template<typename... Ts>
    62      using are_meta_descrs = all_satisfy<is_meta_descr, Ts...>;
    63  
    64      template<typename... Ts>
    65      using are_meta_descrs_but_last = all_satisfy<is_meta_descr, typename all_but_last<Ts...>::type>;
    66  
    67  } // namespace detail
    68  
    69  // Note: descr_of(std::vector<..>) returns a GArrayDesc, while
    70  //       descrs_of(std::vector<..>) returns an array of Meta args!
    71  class UMat;
    72  GAPI_EXPORTS cv::GMetaArgs descrs_of(const std::vector<cv::Mat> &vec);
    73  GAPI_EXPORTS cv::GMetaArgs descrs_of(const std::vector<cv::UMat> &vec);
    74  namespace gapi { namespace own {
    75      GAPI_EXPORTS cv::GMetaArgs descrs_of(const std::vector<Mat> &vec);
    76  }} // namespace gapi::own
    77  
    78  } // namespace cv
    79  
    80  #endif // OPENCV_GAPI_GMETAARG_HPP