The agenda is published and KDAB engineers are offering a wealth of technical talks this year. Optimizing the Rendering of Qt Quick 2 applications, Giuseppe D'Angelo If you have ever wondered how Qt Quick applications are rendered to the screen, and how to use that knowledge to find and fix performance problems, then this talk […]

Sometimes it seems that we have nearly infinite memory resources, especially compared to the tiny 48K RAM of yesteryear’s 8-bit computers. But today’s complex applications can soak up megabytes before you know it. While it would be great if developers planned their memory management for all applications, thinking through a memory management strategy is crucial […]

At KDAB, we know that consistency is an important aspect of the User Experience - users don’t want to have to learn different ways to achieve the same thing. In the Linux world, there is a major structural pitfall to this: the applications written for Linux come in at least two major technologies - Qt […]

Linux perf is an immensely useful and powerful tool suite for profiling of C/C++ applications. I have used it extensively and successfully on various customer projects, both for desktop applications as well as automotive or industrial projects targeting low-end embedded Linux targets running on ARM hardware. The biggest problem with perf really is its usability, […]

Close to three months after the initial hotspot release, I'm happy to announce the release of version 1.1.0. Quick recap: Hotspot is a graphical frontend to the Linux perf profiler suite. It allows you to visually analyze perf.data files with the built-in Flame Graph and the Bottom-Up, Top-Down, or Caller-Callee data tables. It is a […]

After many months of work, I'm very pleased to finally announce KDAB's latest R&D project to the public: hotspot - a GUI for the Linux perf profiler. I have used Linux perf a lot over the past years. It is an extremely powerful and useful tool. But its complexity makes it very hard to use. […]

QZXing is a very useful library: It provides an easy to use Qt integration API around the barcode scanning library ZXing (zebras crossing). Because it is so easy to setup QZXing in a Qt application, we and most of our customers end up using it when they need to scan images for barcodes. There is, […]

I'm extremely happy to finally announce the first stable release of heaptrack, the FOSS heap memory profiler for C/C++ Linux applications. You can download the source tarball from the KDE mirrors: https://download.kde.org/stable/heaptrack/1.0.0/src/ Heaptrack is a fast heap memory profiler that runs on Linux. It allows you to track all heap memory allocations at run-time. Afterwards, […]

Are you a Qt developer and do you use Linux as your development platform of choice? Then this talk is for you: I will introduce you to perf, the Linux tool suite for performance analysis. The talk will not only cover a broad part of what perf has to offer, it will also dive into […]

Hello! This is a small wrap-up fromQtCon, the biggest Qt event in Europe in 2016, that happened at the beginning of September. At QtCon the Qt community joined forces with the KDE, FSFE and VideoLAN communities, to create an exciting event in the spirit of open collaboration and participation amongst projects. During QtCon many KDAB […]

Hello, and welcome to the usual appointment with a new release of Qt! Qt 5.7 has just been released, and once more, KDAB has been a huge part of it (we are shown in red on the graph): In this blog post I will show some of the outstanding contributions by KDAB engineers to the […]

Abstract: The new QtWebChannel module is a ready-to-use solution to make any QObject accessible to arbitrary JavaScript clients. KDAB already uses it in production for a client project on embedded devices, where it proofed to be an essential part for the HTML app framework embedded in a QML chrome. Thanks to QObject introspection, any object […]

An Example of Rendering with Qt3D In the previous article we learned about the requirements and high-level architecture of Qt3D 2.0. In order to put some of this into context and to give you a concrete example of how it looks to draw something in Qt3D using the QML API, we will now briefly show […]

Qt 5.4 was released just last week! The new release comes right on schedule (following the 6-months development cycle of the Qt 5 series), and brings a huge number of new features. KDAB engineers have contributed lots of code to Qt during the last few months. Once more, KDAB is the second largest contributor to […]

Hybrid applications, which mix a UI built with Qt Widgets or Qt Quick with embedded HTML websites, are very popular. In particular, something like an HTML 5 app framework is often requested by customers. Qt WebKit makes it trivial to embed HTML content in any graphical application. But how does one bridge the gap between […]