scrolling text issue

Kaijun Tang

Other Parts Discussed in Thread: DM3730

Hi,

I have created a scrolling text using Qt timer. It works fine in x86-based linux. But I found it is not scrolling smooth on 1Ghz DM3730 processor when I test it on beagleboard. It has a short pause periodically, it seems one or two ticks are missed periodically. I just want to know if the processor has any hardware function to do font acceleration.

over 13 years ago

0 Renjith Thomas over 13 years ago

Guru 31670 points

Tang,

Are you scrolling based on dragging by touch panel inputs? Or is it just a scrolling application, which does scrolling by itself? Are you scrolling vertically or horizontally?

Have you enabled SGX acceleration in your device?

0 Kaijun Tang over 13 years ago in reply to Renjith Thomas

Intellectual 770 points

The text is scrolling itself horizontally. I don't use SGX, I don't know if SGX can accelerate fonts map. But I heard SGX doesn't do much on 2D graphics.

0 Renjith Thomas over 13 years ago in reply to Kaijun Tang

Guru 31670 points

I'm not really sure about this. Have you written your own application for the same?

What is the exact number of frames that you are trying to display per second? Also can you check the fps in the HDMI display?

0 Kaijun Tang over 13 years ago in reply to Renjith Thomas

Intellectual 770 points

Yes, I wrote it with Qt. it is triggerd by timer from 10ms to 100ms. the text is just repositioned. It has nothing to do with frame rate. On screen, video can play well.

0 Prabindh Sundareson over 13 years ago in reply to Kaijun Tang

TI__Expert 6580 points

Qt text rendering can take significant CPU MHz when updated at fast rate. If the text is not changing, try using QStaticText instead, to get improved performance. Link below.

http://qt-project.org/doc/qt-4.8/qstatictext.html

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scrolling text issue