[QtQuick] Image rendering issues on certain android tablet

[lukegluke]

Hi all,

I have 8" tablet MediaTek MT8735, GPU Mali-T720 (1 core), OpenGL ES 3.1, 1280x800, Android 8.1.

Running "Qt Quick Controls 2 - Gallery" on it gives this result with rendering issues on inclined lines (looks familiar to 3d cases when something rendering without antialiasing):

(Add "2" to the picture to ensure that qt-logo@2x.png is used)

I have the same (by design) android tablet, but on different x86 platform:
CPU Intel Atom x5-Z8350, GPU Intel HD Graphics for Atom x5/x7, OpenGL ES 3.1, 1280x736, Android 5.1
Running gallery example on it as also on 3 other tablets and phones, and desktop windows pc gives correct smooth result:

If qt-logo@2x.png image is replaced with the biggest version from qt-logo@4x.png, it'll be rendered fine.

And by the way qt-logo@2x.png resolution is bigger than logo picture size in app, so picture is shrunk and not stretched!

I use the same application for arm-v7 on all devices.

Also I did test first tablet with qt 5.12.0 gallery example built for arm64 - same result.

Thanks in advance for any help.

[lukegluke]

Found the working solution: use mipmap property for smooth downsampling (https://stackoverflow.com/questions/23286666/qml-image-smooth-property-not-working ).

But I still wonder why only 8" tablet MediaTek MT8735, GPU Mali-T720 produces this issue?