QImage bind texture fails

[wysota]

grabWidget is a costly method.

[saman_artorious]

grabWidget is a costly method.

is there any alternative?

[ChrisW67]

If I read your code's intent correctly you are:

1. Creating a QPixmap using grabWidget()
2. Converting the QPixmap to a PNG encoded data stream in a QByteArray
3. Passing the QByteArray to another routine.
4. Creating a QImage from the PNG encoded data stream
5. Binding the QImage texture into a QGLWidget.

Perhaps I have missed something but steps 2 and 4 seem pointless. Why not just pass the QPixmap and call QGLWidget::bindTexture() on that? You avoid two costly conversions through PNG and the construction of a QImage.

[saman_artorious]

Thanks for your idea. I tried it, but it had no effect in term of CPU reduction.

[wysota]

Try this:

http://www.opengl.org/registry/specs...rom_pixmap.txt