// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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//
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// Copyright (C) 2018 Intel Corporation
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#ifndef OPENCV_GAPI_GPROTO_HPP
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#define OPENCV_GAPI_GPROTO_HPP
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#include <type_traits>
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#include <vector>
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#include <ostream>
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#include <opencv2/gapi/util/variant.hpp>
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#include <opencv2/gapi/gmat.hpp>
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#include <opencv2/gapi/gscalar.hpp>
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#include <opencv2/gapi/garray.hpp>
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#include <opencv2/gapi/garg.hpp>
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#include <opencv2/gapi/gmetaarg.hpp>
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namespace cv {
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// FIXME: user shouldn't deal with it - put to detail?
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// GProtoArg is an union type over G-types which can serve as
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// GComputation's in/output slots. In other words, GProtoArg
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// wraps any type which can serve as G-API exchange type.
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//
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// In Runtime, GProtoArgs are substituted with appropriate GRunArgs.
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//
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// GProtoArg objects are constructed in-place when user describes
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// (captures) computations, user doesn't interact with these types
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// directly.
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using GProtoArg = util::variant
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< GMat
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, GMatP
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, GScalar
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, detail::GArrayU // instead of GArray<T>
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>;
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using GProtoArgs = std::vector<GProtoArg>;
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namespace detail
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{
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template<typename... Ts> inline GProtoArgs packArgs(Ts... args)
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{
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return GProtoArgs{ GProtoArg(wrap_gapi_helper<Ts>::wrap(args))... };
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}
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}
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template<class Tag>
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struct GIOProtoArgs
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{
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public:
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explicit GIOProtoArgs(const GProtoArgs& args) : m_args(args) {}
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explicit GIOProtoArgs(GProtoArgs &&args) : m_args(std::move(args)) {}
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GProtoArgs m_args;
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};
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struct In_Tag{};
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struct Out_Tag{};
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using GProtoInputArgs = GIOProtoArgs<In_Tag>;
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using GProtoOutputArgs = GIOProtoArgs<Out_Tag>;
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// Perfect forwarding
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template<typename... Ts> inline GProtoInputArgs GIn(Ts&&... ts)
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{
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return GProtoInputArgs(detail::packArgs(std::forward<Ts>(ts)...));
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}
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template<typename... Ts> inline GProtoOutputArgs GOut(Ts&&... ts)
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{
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return GProtoOutputArgs(detail::packArgs(std::forward<Ts>(ts)...));
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}
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namespace detail
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{
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// Extract elements form tuple
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// FIXME: Someday utilize a generic tuple_to_vec<> routine
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template<typename... Ts, int... Indexes>
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static GProtoOutputArgs getGOut_impl(const std::tuple<Ts...>& ts, detail::Seq<Indexes...>)
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{
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return GProtoOutputArgs{ detail::packArgs(std::get<Indexes>(ts)...)};
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}
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}
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template<typename... Ts> inline GProtoOutputArgs GOut(const std::tuple<Ts...>& ts)
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{
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// TODO: think of std::forward(ts)
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return detail::getGOut_impl(ts, typename detail::MkSeq<sizeof...(Ts)>::type());
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}
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// Takes rvalue as input arg
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template<typename... Ts> inline GProtoOutputArgs GOut(std::tuple<Ts...>&& ts)
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{
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// TODO: think of std::forward(ts)
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return detail::getGOut_impl(ts, typename detail::MkSeq<sizeof...(Ts)>::type());
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}
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// Extract run-time arguments from node origin
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// Can be used to extract constant values associated with G-objects
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// (like GScalar) at graph construction time
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GRunArg value_of(const GOrigin &origin);
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// Transform run-time computation arguments into a collection of metadata
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// extracted from that arguments
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GMetaArg GAPI_EXPORTS descr_of(const GRunArg &arg );
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GMetaArgs GAPI_EXPORTS descr_of(const GRunArgs &args);
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// Transform run-time operation result argument into metadata extracted from that argument
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// Used to compare the metadata, which generated at compile time with the metadata result operation in run time
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GMetaArg GAPI_EXPORTS descr_of(const GRunArgP& argp);
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// Checks if run-time computation argument can be described by metadata
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bool GAPI_EXPORTS can_describe(const GMetaArg& meta, const GRunArg& arg);
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bool GAPI_EXPORTS can_describe(const GMetaArgs& metas, const GRunArgs& args);
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// Checks if run-time computation result argument can be described by metadata.
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// Used to check if the metadata generated at compile time
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// coincides with output arguments passed to computation in cpu and ocl backends
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bool GAPI_EXPORTS can_describe(const GMetaArg& meta, const GRunArgP& argp);
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} // namespace cv
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#endif // OPENCV_GAPI_GPROTO_HPP
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