Fix to QGLWidget crash

QGLWidget crashed due to regression
caused by fix to QTTH-1553. Crash only
occurred if application was locked to
landscape mode but started when device
was in portrait mode.

Task-number: QTTH-1597
Reviewed-by: Laszlo Agocs

Author: Jani Hautakangas

src/opengl/qgl.cpp

@@ -4297,16 +4297,19 @@ bool QGLWidget::event(QEvent *e)
         // if we've reparented a window that has the current context
         // bound, we need to rebind that context to the new window id
         if (d->glcx == QGLContext::currentContext())
-            makeCurrent();
+            makeCurrent(); // Shouldn't happen but keep it here just for sure
 
         if (testAttribute(Qt::WA_TranslucentBackground))
             setContext(new QGLContext(d->glcx->requestedFormat(), this));
     }
 
     // A re-parent is likely to destroy the Symbian window and re-create it. It is important
     // that we free the EGL surface _before_ the winID changes - otherwise we can leak.
-    if (e->type() == QEvent::ParentAboutToChange)
+    if (e->type() == QEvent::ParentAboutToChange) {
+        if (d->glcx == QGLContext::currentContext())
+            d->glcx->doneCurrent();
         d->glcx->d_func()->destroyEglSurfaceForDevice();
+    }
 
     if ((e->type() == QEvent::ParentChange) || (e->type() == QEvent::WindowStateChange)) {
         // The window may have been re-created during re-parent or state change - if so, the EGL

src/opengl/qgl_p.h

@@ -175,6 +175,7 @@ class QGLWidgetPrivate : public QWidgetPrivate
 #endif
 #if defined(Q_OS_SYMBIAN)
                        , eglSurfaceWindowId(0)
+                       , surfaceSizeInitialized(false)
 #endif
     {
         isGLWidget = 1;
@@ -220,6 +221,7 @@ class QGLWidgetPrivate : public QWidgetPrivate
 #ifdef Q_OS_SYMBIAN
     void recreateEglSurface();
     WId eglSurfaceWindowId;
+    bool surfaceSizeInitialized : 1;
 #endif
 };
 

src/opengl/qgl_symbian.cpp

@@ -259,7 +259,7 @@ bool QGLContext::chooseContext(const QGLContext* shareContext) // almost same as
     return true;
 }
 
-void QGLWidget::resizeEvent(QResizeEvent *)
+void QGLWidget::resizeEvent(QResizeEvent *e)
 {
     Q_D(QGLWidget);
     if (!isValid())
@@ -270,17 +270,18 @@ void QGLWidget::resizeEvent(QResizeEvent *)
     if (this == qt_gl_share_widget())
         return;
 
-    if (QGLContext::currentContext())
-        doneCurrent();
-
-    // Symbian needs to recreate the surface on resize.
-    d->recreateEglSurface();
+    if (!d->surfaceSizeInitialized || e->oldSize() != e->size()) {
+        // On Symbian we need to recreate the surface on resize.
+        d->recreateEglSurface();
+        d->surfaceSizeInitialized = true;
+    }
 
     makeCurrent();
+
     if (!d->glcx->initialized())
         glInit();
+
     resizeGL(width(), height());
-    //handle overlay
 }
 
 const QGLContext* QGLWidget::overlayContext() const
@@ -363,6 +364,9 @@ void QGLWidgetPrivate::recreateEglSurface()
     WId currentId = q->winId();
 
     if (glcx->d_func()->eglSurface != EGL_NO_SURFACE) {
+        if (glcx == QGLContext::currentContext())
+            glcx->doneCurrent();
+
         eglDestroySurface(glcx->d_func()->eglContext->display(),
                                                 glcx->d_func()->eglSurface);
     }