git.maemo.org Git - presencevnc/blob - test/painting.cpp

   1 #include <QtGui>
   2 #include <iostream>
   3
   4 //use this rectangle in source image
   5 const int src_xoff = 15;
   6 const int src_yoff = 23;
   7 const int src_width = 600;
   8 const int src_height = 500;
   9 const QRect src_rect(src_xoff, src_yoff, src_width, src_height);
  10
  11
  12 class Widget : public QWidget {
  13 public:
  14         Widget():
  15                 QWidget(0)
  16         {
  17                 msecs = paints = mode = 0;
  18                 img = QImage("stripes.png");
  19
  20                 QTimer *timer = new QTimer(this);
  21                 connect(timer, SIGNAL(timeout()),
  22                         this, SLOT(repaint()));
  23                 timer->start(150);
  24
  25         }
  26 protected:
  27         virtual void paintEvent(QPaintEvent*);
  28 private:
  29         QImage img;
  30         int msecs, paints, mode;
  31 };
  32
  33 void Widget::paintEvent(QPaintEvent*)
  34 {
  35         QPainter painter(this);
  36         //painter.setRenderHint(QPainter::SmoothPixmapTransform);
  37
  38         QTime t;
  39         t.start();
  40
  41         switch(mode) {
  42 //scaled (fit to window)
  43         case 0: //this is how small updates in 0.6 are done
  44                 painter.drawImage(rect(),
  45                         img.copy(src_rect)
  46                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  47                 break;
  48         case 1: //fast transformation
  49                 painter.drawImage(rect(),
  50                         img.copy(src_rect)
  51                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::FastTransformation));
  52                 break;
  53         case 2: //tell drawImage() that no further scaling is required
  54         //why different from 1?
  55                 painter.drawImage(rect().topLeft(),
  56                         img.copy(src_rect)
  57                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  58                 break;
  59         case 3: //avoid scaled()
  60                 painter.drawImage(rect(),
  61                         img.copy(src_rect));
  62                 break;
  63         case 4: //avoid copy() and scaled()
  64                 painter.drawImage(rect(), img, src_rect);
  65                 break;
  66
  67 // not scaled - repeat preceeding tests with dimensions that just happen to require no transformation
  68 // these are all comparable
  69         case 5: //this is how small updates in 0.6 are done
  70                 painter.drawImage(rect(),
  71                         img.copy(rect())
  72                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  73                 break;
  74         case 6: //fast transformation
  75                 painter.drawImage(rect(),
  76                         img.copy(rect())
  77                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::FastTransformation));
  78                 break;
  79         case 7: //tell drawImage() that no further scaling is required
  80                 painter.drawImage(rect().topLeft(),
  81                         img.copy(rect())
  82                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  83                 break;
  84         case 8: //avoid scaled()
  85                 painter.drawImage(rect(),
  86                         img.copy(rect()));
  87                 break;
  88         case 9: //avoid copy() and scaled()
  89                 painter.drawImage(rect(), img, rect());
  90                 break;
  91 //and a few extra
  92         case 10:
  93                 painter.drawImage(rect().topLeft(), img, rect());
  94                 break;
  95         case 11:
  96                 painter.drawImage(rect().topLeft(), img);
  97                 break;
  98         case 12:
  99                 painter.drawImage(rect().topLeft(),
 100                         img.copy(rect()));
 101                 break;
 102         case 13: //5 with KeepAspectRatio
 103                 painter.drawImage(rect(),
 104                         img.copy(rect())
 105                         .scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
 106                 break;
 107         }
 108
 109         msecs += t.elapsed();
 110         paints++;
 111
 112         const int paints_per_mode = 20;
 113         const int num_modes = 14;
 114
 115         if(paints > paints_per_mode) {
 116                 std::cout << mode << ":\t" << double(msecs)/paints << " msecs per paint\n";
 117                 msecs = paints = 0;
 118                 mode++;
 119                 if(mode >= num_modes)
 120                         close();
 121         }
 122
 123 }
 124
 125 int main(int argc, char* argv[])
 126 {
 127         QApplication app(argc, argv);
 128
 129         Widget w;
 130         w.show();
 131
 132         return app.exec();
 133 }