Custom Query (27 matches)

Simple sound facilities (playing a WAV file) are (also) used very often by "real-world" Qt applications.

If we have a QApplication instance created on the stack in main() (a very common practice for 99% of Qt apps), then an attempt to call the exit() function from stdlib will produce an application trap with a popuplog entry (SYS3170/c0010001, most likely in DOSCALL1.DLL).

A simple example to reproduce:

#include <qapplication.h>
#include <stdlib.h>
int main (int argc, char **argv)
{
    QApplication a (argc, argv);
    exit (-1);
}

From what I've already found, this happens when a global QFontCache (internal QObject subclass) instance is being destroyed (by a static func from the exit list). It is created as a child of QApplication, so its QObject desctructor calls parentObject->removeChild (this); but for some reason the vtable of the QApplocation instance is already corrupted by that time (but no QApplocation destructor has been called yet!).

We need to support the alpha channel in the QPixmap implementation, and correctly blend it when drawing pixmaps both to widgets and to other pixmaps.