1 files changed, 53 insertions, 7 deletions

diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 3affca4..70ddc20 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -96,7 +96,7 @@
 
 QT_BEGIN_NAMESPACE
 
-#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS) || defined(Q_WS_QPA)
+#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS) || defined(Q_WS_QPA) || defined(Q_OS_SYMBIAN)
 QGLExtensionFuncs QGLContextPrivate::qt_extensionFuncs;
 #endif
 
@@ -2271,7 +2271,7 @@ static void convertToGLFormatHelper(QImage &dst, const QImage &img, GLenum textu
     }
 }
 
-#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS) || defined(Q_WS_QPA)
+#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS) || defined(Q_WS_QPA) || defined(Q_OS_SYMBIAN)
 QGLExtensionFuncs& QGLContextPrivate::extensionFuncs(const QGLContext *)
 {
     return qt_extensionFuncs;
@@ -2294,11 +2294,19 @@ QImage QGLContextPrivate::convertToGLFormat(const QImage &image, bool force_prem
 QGLTexture *QGLContextPrivate::bindTexture(const QImage &image, GLenum target, GLint format,
                                            QGLContext::BindOptions options)
 {
+    Q_Q(QGLContext);
+
     const qint64 key = image.cacheKey();
     QGLTexture *texture = textureCacheLookup(key, target);
     if (texture) {
-        glBindTexture(target, texture->id);
-        return texture;
+        if (image.paintingActive()) {
+            // A QPainter is active on the image - take the safe route and replace the texture.
+            q->deleteTexture(texture->id);
+            texture = 0;
+        } else {
+            glBindTexture(target, texture->id);
+            return texture;
+        }
     }
 
     if (!texture)
@@ -2564,14 +2572,19 @@ QGLTexture *QGLContextPrivate::bindTexture(const QPixmap &pixmap, GLenum target,
     }
 #else
     Q_UNUSED(pd);
-    Q_UNUSED(q);
 #endif
 
     const qint64 key = pixmap.cacheKey();
     QGLTexture *texture = textureCacheLookup(key, target);
     if (texture) {
-        glBindTexture(target, texture->id);
-        return texture;
+        if (pixmap.paintingActive()) {
+            // A QPainter is active on the pixmap - take the safe route and replace the texture.
+            q->deleteTexture(texture->id);
+            texture = 0;
+        } else {
+            glBindTexture(target, texture->id);
+            return texture;
+        }
     }
 
 #if defined(Q_WS_X11)
@@ -4204,6 +4217,34 @@ bool QGLWidget::event(QEvent *e)
         d->glcx->d_ptr->clearDrawable();
 #  endif
     }
+#elif defined(Q_OS_SYMBIAN)
+    // prevents errors on some systems, where we get a flush to a
+    // hidden widget
+    if (e->type() == QEvent::Hide) {
+        makeCurrent();
+        glFinish();
+        doneCurrent();
+    } else if (e->type() == QEvent::ParentChange) {
+        // 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();
+
+        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)
+        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
+        // surface will need to be re-created.
+        d->recreateEglSurface();
+    }
+
 #endif
 
     return QWidget::event(e);
@@ -4411,6 +4452,11 @@ void QGLWidget::glDraw()
     Q_D(QGLWidget);
     if (!isValid())
         return;
+#ifdef Q_OS_SYMBIAN
+    // Crashes on Symbian if trying to render to invisible surfaces
+    if (!isVisible() && d->glcx->device()->devType() == QInternal::Widget)
+        return;
+#endif
     makeCurrent();
 #ifndef QT_OPENGL_ES
     if (d->glcx->deviceIsPixmap())