#include <QtGlobal>
#include <QtWidgets>
#include "ThumbGen.h"


#include "PDFPageWidget.h"
ThumbGen::ThumbGen(void)
{

}

double ThumbGen::calcDpi(Poppler::Page *pdfPage, QSize targetSize){
  double dpi;
  QSizeF oriSize = pdfPage->pageSizeF();
  double oriDpi = 72;
  if (targetSize.width() > targetSize.height()){
    dpi = targetSize.height()/(float)oriSize.height()*72;
  }else {
    dpi= targetSize.width()/(float)oriSize.width()*72;
  }
  return dpi;

}

void ThumbGen::run(){
  while(pWidgets.size()!=0){
    mutex.lock();
    PDFPageWidget *pw = pWidgets.first();
    pWidgets.pop_front();
    Poppler::Page *pp = pPages.first();
    pPages.pop_front();
    mutex.unlock();

    double dpi=calcDpi(pp,pw->size());
    QImage pageImage = pp->renderToImage(dpi, dpi);
    emit updateThumbnail(pageImage,pw);
  }
}
void ThumbGen::render(PDFPageWidget* pw,Poppler::Page* pp){
  mutex.lock();
  pWidgets.append(pw);
  pPages.append(pp);
  mutex.unlock();
}