Ram use and transparent effects

[poetaster]

Interesting you should ask. The opacity blur effect does have overhead, though I don’t think ram is a significant issue, but cpu usage is.

While tracking down a bug, jolla came across a solution which peaked @nephros curiousity about this:

Canvas.requestPaint() renders Image data tinted blue

I wonder, if there’s some confusion in RGBA vs ARGB in some components of Qt/Lipsick/Silica, would that maybe also explain the high CPU usage for “rgba” elements found and documented by @leszek? Or rather, are these copy operations particularly expensive?

The code, maybe, this: GitHub - sailfishos/qtscenegraph-adaptation

But there maybe other things involved.

The way things are done on SFOS uses custom (Sailfish.Silica) QML classes. Those are generally not compatible with other OS. If you want to see a ‘cross-seciton’ of QML approaches with one c++ base, have a look at GitHub - poetaster/SailConnect4: Connect 4 game with strong and configurable IA for Sailfish OS and desktop using Qt/C++ to see parallel Android and SFOS stuff. But I admit I’m not the original developer and have never tested Android.