Re: [Interest] Qt5 performance on imx6 with full hd

[Jason H]

Three was some static flag that I seem to b remember that could be set to hekp with spending less time in repaonts. Maybe it was for text maybe it was qlabels. But it is something to that effect.
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Sent from my Android phone with GMX Mail. Please excuse my brevity.

Jacob Kroon <jacob.kr...@gmail.com> wrote:

Hi,

I'm experimenting with a Qt application running on the Wandboards,
at full hd resolution, 1920x1080x32. I have a static background image, and some small animated Qml-elements on the screen. I'm not entirely satisfied with the resulting performance, and I think it is because of the background image being constantly fully redrawn in each frame. I've experimented with

* setClearBeforeRendering(false), since the background will be drawn anyway, there is no point in clearing before rendering. This seemed to have little impact on performance though.

* Letting Qt5 render into /dev/fb1 overlay on the imx6, with no background image, but instead write the background image manually into /dev/fb0. In this way, the IPU will blend the result onto the display. This seemed to be even worse than letting the GPU render the background.

Can the scenegraph be smart enough in such a way that it will only "clear" dirty rectangles with a user supplied background image ? Or are there any other tricks I am not aware of ?

Regards Jacob

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