AVFoundation: Fix y-inverted QML Videos

When the code that supports iOS was added, we introduced a bug where QML
videos would be played y-inverted on OS X.  This is because we made no
effort to y-invert the Framebuffer Object before rendering the texture
in the SceneGraph.  Now we render the video the the FBO y-inverted, so
there is no need to y-invert the resulting texture.

Task-number: QTBUG-35955
Change-Id: I41af1aaae57923b9972b5be5ec65f7d2a97d77c5
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/plugins/avfoundation/mediaplayer/avfvideoframerenderer.mm

@@ -120,7 +120,7 @@ QImage AVFVideoFrameRenderer::renderLayerToImage(AVPlayerLayer *layer)
         return QImage();
 
     renderLayerToFBO(layer, fbo);
-    QImage fboImage = fbo->toImage().mirrored();
+    QImage fboImage = fbo->toImage();
     m_glContext->doneCurrent();
 
     return fboImage;
@@ -204,7 +204,8 @@ void AVFVideoFrameRenderer::renderLayerToFBO(AVPlayerLayer *layer, QOpenGLFrameb
     glPushMatrix();
     glLoadIdentity();
 
-    glOrtho(0.0f, m_targetSize.width(), m_targetSize.height(), 0.0f, 0.0f, 1.0f);
+    //Render to FBO with inverted Y
+    glOrtho(0.0, m_targetSize.width(), 0.0, m_targetSize.height(), 0.0, 1.0);
 
     glMatrixMode(GL_MODELVIEW);
     glPushMatrix();