include/fsdk/IDetector.h

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#pragma once

#include <fsdk/FSDKError.h>
#include <fsdk/IFaceDetectionBatch.h>
#include <fsdk/IObject.h>
#include <fsdk/Types.h>
#include <fsdk/Types/Face.h>
#include <fsdk/Types/SensorType.h>

#include <fsdk/vlc/future.h>

#include <functional>

namespace fsdk {

#ifndef DOXYGEN_SHOULD_SKIP_THIS
    DECLARE_SMARTPTR(IDetector);
#endif

    enum ObjectDetectorClassType {
        FACE_DET_DEFAULT = 0, 
        FACE_DET_V1 = 4,      
        FACE_DET_V2 = 5,      
        FACE_DET_V3 = 6,      
        FACE_DET_V3M = 7,     
        FACE_DET_COUNT = 8,   
    };

    enum DetectionComparerType {
        DCT_CONFIDENCE = 0,        
        DCT_CENTER,                
        DCT_CENTER_AND_CONFIDENCE, 
        DCT_SIZE,                  
        DCT_COUNT
    };

    enum DetectionType {
        DT_BBOX = 0,             
        DT_LANDMARKS5 = 1 << 0,  
        DT_LANDMARKS68 = 1 << 1, 
        DT_ALL = 0xffff          
    };

    inline DetectionType operator|(DetectionType a, DetectionType b) {
        return static_cast<DetectionType>(static_cast<int>(a) | static_cast<int>(b));
    }

    class IDetectionComparer {
    public:
        virtual bool compare(const Image& img, const Detection& a, const Detection& b) const = 0;
        virtual ~IDetectionComparer() = default;
    };

    class FunctionDetectionComparer : public IDetectionComparer {
    public:
        typedef std::function<bool(const Image& img, const Detection&, const Detection&)> Function;

        explicit FunctionDetectionComparer(const Function& function)
            : func(function) {
        }

        bool compare(const Image& img, const Detection& a, const Detection& b) const {
            return func(img, a, b);
        }

    private:
        Function func;
    };

    struct IDetector : IRefCounted {
        virtual ResultValue<FSDKError, Ref<IFaceDetectionBatch>> detect(
            Span<const Image> images,
            Span<const Rect> ROIs,
            uint32_t perImageNum,
            DetectionType type = DT_BBOX) noexcept = 0;

        virtual ResultValue<FSDKError, Face>
        detectOne(const Image& image, const Rect& rect, DetectionType type = DT_BBOX) noexcept = 0;

        virtual ResultValue<FSDKError, Ref<IFaceDetectionBatch>> redetect(
            Span<const Image> images,
            Ref<IFaceDetectionBatch> detectionBatch,
            DetectionType type = DT_BBOX) noexcept = 0;

        virtual ResultValue<FSDKError, Ref<IFaceDetectionBatch>> redetect(
            Span<const Image> images,
            Span<Span<const Detection>> detections,
            DetectionType type = DT_BBOX) noexcept = 0;

        virtual ResultValue<FSDKError, Face>
        redetectOne(const Image& image, const Detection& detection, DetectionType type = DT_BBOX) noexcept = 0;

        virtual void setDetectionComparer(DetectionComparerType comparerType) noexcept = 0;

        virtual void setCustomDetectionComparer(const IDetectionComparer* comparer) noexcept = 0;

        virtual Result<FSDKError> validate(
            Span<const Image> images,
            Span<Span<const Detection>> detections,
            Span<Span<Result<FSDKError>>> errors) const noexcept = 0;

        virtual Result<FSDKError> validate(
            Span<const Image> images,
            Span<const Rect> rects,
            uint32_t detectionPerImageNum,
            Span<Result<FSDKError>> outErrors) const noexcept = 0;

        virtual Result<FSDKError> validate(
            Span<const Image> images,
            Ref<IFaceDetectionBatch> detectionBatch,
            Span<Result<FSDKError>> outErrors) const noexcept = 0;

        using FaceBatchFuture = vlc::future<IFaceDetectionBatchPtr>;

        virtual FaceBatchFuture detectAsync(
            Span<const Image> images,
            Span<const Rect> rectangles,
            uint32_t perImageNum,
            DetectionType type = DT_BBOX) const = 0;

        virtual FaceBatchFuture redetectAsync(
            Span<const Image> images,
            IFaceDetectionBatchPtr detectionBatch,
            DetectionType type = DT_BBOX) const = 0;
    };

} // namespace fsdk