[Qt4.8] QML: Text corruption

[wysota]

Why it's better to use a viewport instead of just switching everything to the opengl render?

I develop an application for Android, iOS, Windows, Mac OS X and we plan to migrate it to Qt5.x in a near future. On platforms like Android or iOS opengl is the native graphic system.
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Because the gl renderer is of lower quality than the raster one. And (I think) it won't work on Qt5 anyway.

[flamaros]

Because the gl renderer is of lower quality than the raster one. And (I think) it won't work on Qt5 anyway.

With Qt5 the default render engine for QML is opengl, but with a scene graph.

[wysota]

With Qt5 the default render engine for QML is opengl, but with a scene graph.

A render engine -- yes, graphics system -- no. I'm telling you to use a QGLWidget as the viewport which makes QML render using OpenGL while keeping the graphicssystem at its default value which makes everything else use whatever is set as default on the platform. In Qt5 there are no graphics systems, only QPA plugins. Using QtQuick2 requires a QPA plugin that supports OpenGL(ES) 2.0+, that's it, nothing more.