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("test.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
  37         QTime t;
  38         t.start();
  39
  40         switch(mode) {
  41 //scaled (fit to window)
  42         case 0: //this is how small updates in 0.6 are done
  43                 painter.drawImage(rect(),
  44                         img.copy(src_rect)
  45                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  46                 break;
  47         case 1: //fast transformation
  48                 painter.drawImage(rect(),
  49                         img.copy(src_rect)
  50                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::FastTransformation));
  51                 break;
  52         case 2: //tell drawImage() that no further scaling is required
  53         //why different from 1?
  54                 painter.drawImage(rect().topLeft(),
  55                         img.copy(src_rect)
  56                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  57                 break;
  58         case 3: //avoid scaled()
  59                 painter.drawImage(rect(),
  60                         img.copy(src_rect));
  61                 break;
  62         case 4: //avoid copy() and scaled()
  63                 painter.drawImage(rect(), img, src_rect);
  64                 break;
  65
  66 // not scaled - repeat preceeding tests with dimensions that just happen to require no transformation
  67 // these are all comparable
  68         case 5: //this is how small updates in 0.6 are done
  69                 painter.drawImage(rect(),
  70                         img.copy(rect())
  71                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  72                 break;
  73         case 6: //fast transformation
  74                 painter.drawImage(rect(),
  75                         img.copy(rect())
  76                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::FastTransformation));
  77                 break;
  78         case 7: //tell drawImage() that no further scaling is required
  79                 painter.drawImage(rect().topLeft(),
  80                         img.copy(rect())
  81                         .scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
  82                 break;
  83         case 8: //avoid scaled()
  84                 painter.drawImage(rect(),
  85                         img.copy(rect()));
  86                 break;
  87         case 9: //avoid copy() and scaled()
  88                 painter.drawImage(rect(), img, rect());
  89                 break;
  90 //and a few extra
  91         case 10:
  92                 painter.drawImage(rect().topLeft(), img, rect());
  93                 break;
  94         case 11:
  95                 painter.drawImage(rect().topLeft(), img);
  96                 break;
  97         case 12:
  98                 painter.drawImage(rect().topLeft(),
  99                         img.copy(rect()));
 100                 break;
 101         case 13: //5 with KeepAspectRatio
 102                 painter.drawImage(rect(),
 103                         img.copy(rect())
 104                         .scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
 105                 break;
 106         }
 107
 108         msecs += t.elapsed();
 109         paints++;
 110
 111         const int paints_per_mode = 20;
 112         const int num_modes = 14;
 113
 114         if(paints > paints_per_mode) {
 115                 std::cout << mode << ":\t" << double(msecs)/paints << " msecs per paint\n";
 116                 msecs = paints = 0;
 117                 mode++;
 118                 if(mode >= num_modes)
 119                         close();
 120         }
 121
 122 }
 123
 124 int main(int argc, char* argv[])
 125 {
 126         QApplication app(argc, argv);
 127
 128         Widget w;
 129         w.show();
 130
 131         return app.exec();
 132 }