qt-everywhere-src-5.14.1/qtwebengine/src/webenginewidgets/api/qtwebenginewidgetsglobal.cpp

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#include "qtwebenginewidgetsglobal.h"

#include <QCoreApplication>
#include <QOpenGLContext>

namespace QtWebEngineCore
{
    extern void initialize();
}

QT_BEGIN_NAMESPACE

#ifndef QT_NO_OPENGL
Q_GUI_EXPORT QOpenGLContext *qt_gl_global_share_context();
#endif

static void initialize()
{
#ifndef QT_NO_OPENGL
    if (QCoreApplication::instance()) {
        //On window/ANGLE, calling QtWebEngine::initialize from DllMain will result in a crash.
        if (!qt_gl_global_share_context()) {
            qWarning("Qt WebEngine seems to be initialized from a plugin. Please "
                     "set Qt::AA_ShareOpenGLContexts using QCoreApplication::setAttribute "
                     "before constructing QGuiApplication.");
        }
        return;
    }
    //QCoreApplication is not yet instantiated, ensuring the call will be deferred
    qAddPreRoutine(QtWebEngineCore::initialize);
#endif // QT_NO_OPENGL
}

Q_CONSTRUCTOR_FUNCTION(initialize)

QT_END_NAMESPACE