QPixmap load

When trying to load image files that does not exist, the QPixmap::load functions ends up calling QImageReader::supportedImageFormats which in turn tries to load several plugins by calling dlopen (this happens for each time that function is called). This is time-consuming and is especially visible when debugging an application.

#include <QApplication>
#include <QPixmap>

int main(int argc, char **argv)
{
QApplication app(argc, argv);

for(int i=0; i<50; ++i)
QPixmap * pix = new QPixmap("some_non-existing.file");

app.exit(0);
}