STemWin - Background image on layer 0

dariog · Feb 17th 2015, 5:42pm

Hello,
I would like to use layer 0 to set background image but it doesn't work.
On the WM_INIT_DIALOG messages of each WINDOW dialog I execute this code:

Source Code

GUI_SelectLayer(0);
GUI_SetLayerVisEx (0, 0);
GUI_DrawBitmap(&bmHandle, 0,0);
GUI_SetLayerVisEx (0, 1);
GUI_SelectLayer(1);
GUI_Clear();

What is wrong?

Dario

SEGGER - Adrian · Feb 18th 2015, 9:55am

Hello Dario,

For detailed information on how to handle windows on layers, please refer to the section 24.1.2 "MultiLayer / MultiDisplay support" -> "Introduction" -> "Selecting a layer for a window" in the emWin user manual.

Best regards,
Adrian

dariog · Feb 18th 2015, 10:03am

Reading the manuale seems that if want to create a window with a custom baground image I need to create two window one for each layer. Is it correct?

Dario

SEGGER - Adrian · Feb 19th 2015, 10:32am

Hello Dario,

I would suggest you to create one window with a custom callback function in order to react to the WM_PAINT message.

Best regards,
Adrian

dariog · Feb 19th 2015, 1:29pm

Hello Adrian,
I tried your solution but drawing background picture together with live data on WM_PAINT increase a lot the CPU load (+40%).
Are there other solutions more efficient? I have 5 rolling windows each one with it's custom background.

thanks,
Dario

SEGGER - Adrian · Mar 9th 2015, 10:31am

Hello Dario,

Of course CPU load increases with the number of moving windows. I would suggest you to perform most of the moving actions using hardware layers. Further effects can also be performed using Memory Devices. For details, please refer to the chapters "Memory Devices" and "MultiLayer"

Best regards,
Adrian

Source Code

Share