#include"ac.h"

extern "C" void filter(cv::Mat  &frame) {
    static constexpr int MAX = 8;
    static ac::MatrixCollection<MAX> collection;
    if(collection.empty()) {
        srand(static_cast<unsigned int>(time(0)));
        collection.shiftFrames(frame);
    }
    collection.shiftFrames(frame);
    
    int line_start_x = rand()%(frame.cols-1);
    int line_dip = rand()%10;
    static int cnt = 0;
    static int rnd_max = rand()%50;
    static bool none = false;
    static int offset = 0;
    if(++cnt > rnd_max) {
        cnt = 0;
        rnd_max = rand()%50;
        none = !none;
    }
    if(none == true) return;
    
    for(int z = 0; z < frame.rows; ++z) {
    
        int line_inc = 0;
        int line_pos = 0;
        
        for(int i = line_start_x; i < frame.cols; ++i) {
            cv::Vec3b &pixel = ac::pixelAt(frame, z, i);
            ++line_pos;
            if(line_pos > line_dip) {
                ++line_inc;
            }
            
            if(z+line_inc < frame.rows) {
                cv::Vec3b pix = collection.frames[offset].at<cv::Vec3b>(z+line_inc, i);
                for(int q = 0; q < 3; ++q) {
                    pixel[q] = ac::wrap_cast((0.5 * pixel[q]) + (0.5 * pix[q]));
                }
            }
        }
    }
    
    if((++offset > (MAX-1))) {
        offset = rand()%(MAX-1);
    }
}