UWP app on Windows IoT Core renders image wrong

Dick M 1

Hi,

Runtime creating some images on a XAML page (as children of a canvas), assigning a BitmapImage as source. Occasionally the images (which are rather small) show partials of other images from within the application. After a redraw, the images are rendered correctly again (based on the same PNG files, running through the same code).

Sample with random wrong images:

Checked the resources on the Raspberry PI 3b but memory is only at 40%. And it does not happen all the time, so no reproduction path available.

Hope someone has a clue.

KR, Dick

Cris Zhan-MSFT 6,601 Reputation points

2021-04-15T10:00:10.77+00:00

Hello,

Does this problem happen randomly only on Raspberry Pi devices with Windows Iot Core? Will you encounter this problem when deploying this APP on local machine or other devices? May I know the version of Windows Iot Core you are using.
Dick M 1 Reputation point

2021-04-22T19:47:13.397+00:00

Hi @Cris Zhan-MSFT ,

Sorry for the late reply, did not notice your prompt response.

I have not seen it happen on regular Windows 10 systems so far, only on IoT core. We are using build 17763, which works great for our software except for the random glitch in image displaying.

Dick
Cris Zhan-MSFT 6,601 Reputation points

2021-04-23T09:37:46.037+00:00

Hello Dick,

It seems that this is a random error that cannot be reproduced accurately. When you say that running this app on your local machine has not had this problem yet, it seems to point to the specific system or device, not the app itself.

Also, does this problem only occur on one device? Or multiple RPi 3b devices with windows IOT Core (17763) running this app all have this problem.

Best Regards,
Dick M 1 Reputation point

2021-04-23T16:05:09.897+00:00

Hi @Cris Zhan-MSFT ,

We have seen it on several RPi 3b devices but randomly indeed. I assume it could happen on all of them but might not be seen since it cannot be reproduced accurately.

Currently I have increased the amount of memory available for the GPU in the RPi settings, hoping that might solve the problem.

Dick
Dick M 1 Reputation point

2021-06-06T18:59:36.377+00:00

Hi @Cris Zhan-MSFT ,

By now we did some more testing after increasing the gpu_mem to a higher value. It seems that the problem occurs less often but that might also be a feeling.

Does Windows IoT Core use the gpu_mem for rendering UWP pages? Which would make further increasing it, an option...

KR, Dick