Detecting Overdraw in QML HMIs with GammaRay

Overdraw happens when one QML item fully eclipses another QML item. The QML renderer always draws both items, although there is no need to draw the eclipsed item. You must help out the renderer by explicitly setting visible: false on the eclipsed item. On embedded systems, heavy overdraw makes animations or flicking jerky. In...

Using Qt 5.6 and Later under LGPL

Up to Qt 5.3, things were pretty simple. Most modules were under LGPLv2.1 with the exception of some commercial modules. Starting with Qt 5.4, new Qt modules were published under LGPLv3 and old modules additionally under LGPLv3. With Qt 5.6, we now have quite a patchwork of modules under different licenses. Qt 5.7 will...

Responsive QML HMIs with Scaling

The HMIs of in-vehicle infotainment systems, TVs, phones and many other systems must adapt to different screen resolutions and formats. This adaptation should happen with as little duplicate effort as possible. The simplest way of doing this for QML HMIs is to scale the values of all x, y, width, height, margin and border...

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