#include "clahe.h"
#include <QDebug>

CLAHE::CLAHE()
{
    _clahe = cv::createCLAHE();
}

void CLAHE::loadFile(const QString &path)
{
    cv::Mat tmp;
    tmp = cv::imread(path.toStdString(), cv::IMREAD_COLOR | cv::IMREAD_ANYDEPTH);
    double scale = tmp.depth()==CV_8U ? 1.0/255 : 1.0/65535;
    tmp.convertTo(tmp, CV_32F, scale);
    cv::cvtColor(tmp, tmp, cv::COLOR_BGR2Lab);
    cv::split(tmp, _image);
    _image[0].convertTo(_lumImage, CV_16U, 655.35);
    double min, max;
    cv::minMaxLoc(_image[0], &min, &max);
    qDebug() << scale << min << max;
}

void CLAHE::saveFile(const QString &path)
{

}

void CLAHE::apply(float clipLimit, int kernelSize)
{
    cv::Mat lum;
    _clahe->setClipLimit(clipLimit);
    _clahe->setTilesGridSize(cv::Size(kernelSize, kernelSize));
    _clahe->apply(_lumImage, lum);
    //lum = _lumImage;
    lum.convertTo(_image[0], CV_32F, 1.0/655.35);
    double min, max;
    cv::minMaxLoc(_image[0], &min, &max);
    qDebug() << min << max;
}

QPixmap CLAHE::getImage() const
{
    cv::Mat tmp;
    cv::merge(_image, 3, tmp);
    cv::cvtColor(tmp, tmp, cv::COLOR_Lab2RGB);
    tmp.convertTo(tmp, CV_8U, 255);
    QImage ret(tmp.data, tmp.cols, tmp.rows, tmp.step, QImage::Format_RGB888);
    //ret.bits();//perform deep copy of tmp.data pointer
    return QPixmap::fromImage(ret);
}