Hi all,

I'm writing an application which dynamically changes the picture on running video streams. The OS is debian based with X11.

The problem is a slow but surely increasing memory leak reported by process "xorg" (not by my application). A little bit googling hinted that the pixmap paiting on the video could be an issue. I tried to comment the relavant part of the code and the memroy leak disappeared. And then, I started uncommenting bit by bit. Now the whole memory leak has come down to 3 lines of code:

Qt Code: 
  1. // Setting source and target for drawPixmap()
  2.     QRectF source(0, 0, currPixmap->width(), currPixmap->height());
  3.     QRectF target(0, 0, objectCameraSelectionWindow->getDirectionImageWidth(),
  4.                   objectCameraSelectionWindow->getDirectionImageHeight());
  5.  
  6.     // drawPixmap() is faster on-screen while drawImage() may be faster on
  7.     // QPainter or other devices.
  8.     painter.drawPixmap(target, *currPixmap, source);
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So, again if I uncomment this code, linux command "top" reports a disticnt memory leak, otherwise not. The code snippet is used inside the paintEvent method:

Qt Code: 
  1. void RenderDirection::paintEvent(QPaintEvent *)
  2. {
  3.     QPainter painter(this);
  4.     QPixmap* currPixmap=0;
  5.  
  6.     // Choose the coirrect bitmap
  7.     if(direction == "left"){
  8.  
  9.         currPixmap = objectCameraSelectionWindow->getImageOnLeftVideo();
  10.     }
  11.     else if(direction == "right"){
  12.  
  13.         currPixmap = objectCameraSelectionWindow->getImageOnRightVideo();
  14.     }
  15.  
  16.  
  17.     // Setting source and target for drawPixmap()
  18.     QRectF source(0, 0, currPixmap->width(), currPixmap->height());
  19.     QRectF target(0, 0, objectCameraSelectionWindow->getDirectionImageWidth(),
  20.                   objectCameraSelectionWindow->getDirectionImageHeight());
  21.  
  22.     // drawPixmap() is faster on-screen while drawImage() may be faster on
  23.     // QPainter or other devices.
  24.     painter.drawPixmap(target, *currPixmap, source);
  25. }
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As usual, any help is much appreciated.
Anirban