KDAB TV – Presentations

How to painlessly migrate from MFC to Qt

TALK: Migrating from MFC to Qt
SPEAKER: Nicolas Arnaud Cormos
COMPANY: KDAB
TRACK: Application Development

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Microsoft Foundation Class Library (MFC) is a legacy C++ object-oriented library on Windows that exists since the dawn of Windows. It has been replaced lately with more up to date framework, but MFC legacy code still widely exists. While Qt and MFC are both over 25 years old, that’s where the similarity ends. Qt is actively maintained by a vibrant developer community, upgraded regularly to embrace the latest programming improvements, and expanded to cover new devices and operating systems. Qt is then a natural candidate for replacement of MFC. In this talk, we will discuss the strategy and steps to migrate an MFC legacy code base to Qt, how to map MFC code to Qt, as well as some of the traps to avoid.

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29 3

What's new with QStringView; and how can it handle string processing with Qt.

TALK: QStringView - Past, Present & Future
SPEAKER: Marc Mutz
COMPANY: KDAB
TRACK: Qt Technical Deep Dive

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Since QStringView was added in Qt 5.10, not much has happened, and the presenter duly asks for forgiveness for having stepped away from QStringView development for two years. But he’s back now, and Qt 5.14 will contain a significantly more complete QStringView (and QLatin1String) ecosystem than 5.13 did. If you do string processing with Qt, this talk is for you. After a very brief recap on QStringView’s general purpose in Qt, we will look at what’s new in Qt 5.14 with respect to QStringView and, time permitting, take a brief look into the near future.

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6 1

Make UI components that behave like you want them to with QML

TALK: QML Component Design
SPEAKER: Andre Somers
COMPANY: KDAB
TRACK: Qt Technical Deep Dive

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Did you ever create QML components that both display and manipulate a state that is stored in some kind of back-end? How do you ensure a property binding set by the user of your component stays in tact? What should happen if that backed is slow, or rejects your changes? In this talk, we will explore this problem in some more detail, and demonstrate a few possible solutions that deal with the challenges raised in different ways. The goal is that at the end of this talk, you will have the tools available to make UI components that behave predictably and are intuitive to use in your applications.

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32 5

Practical application scripting with QML

TALK: Practical Application Scripting With QML
SPEAKER: Kevin Krammer
COMPANY: KDAB
TRACK: Tooling & Testing

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
In my talk “When all goes according to script” at Qt World Summit 2015 [1] I explored the fundamentals of using the QML environment for the purpose of in-application scripting. In this follow-up, I am going to look into more practical aspects, especially on how the powerful declarative approach in QML allows very easy handling of asynchronous scripting tasks. The format will be a series of live-demos with Qt applications which either have been extended with such a scripting environment or even which have been built specifically around this capability. Similar to the original talk the goal is to show once again that QML is a versatile and powerful component for all Qt application development, above and beyond the already established use case of building advanced UIs. [1] https://resources.qt.io/videos/qtws15-when-all-goes-according-to-script-qt-application-development-kevin-krammer-kdab

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13 4

Tools for making improved models with Qt

TALK: Model Models - Tools for Making Better Behaved Models
SPEAKER: André Somers
COMPANY: KDAB
TRACK: Tooling & Testing

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Qt QAbstractItemModel API is used for both widgets and QML applications where it plays a central role for cases where there is a need to present larger quantities of data. For optimal performance, UI experience and to be able to use the insert, remove, move and displaced transitions on the QML ListView it is imperative that updates are signaled properly and as finely-grained as possible. But how do we deal with back-ends that don’t deliver enough data to do this? What if they just signal ‘changed’ or give us a whole new list without indicating what changed? Instead of relying on repetitive, hard-to-read and error-prone code or in the worst case relying on a model reset, I will present a generic approach leading to a simple drop-in solution to deal with data that comes in in bulk which results in proper, finely-grained updates to the model. A similar problem is providing all needed signals in case the model needs to be sorted. While a QSortFilterProxyModel does a good job doing the actual sorting, it does not provide the required signals to allow animating items moving in a QML ListView when the value of items changes or when the sort role or -column changes. In order to fix this, I will present a specialized proxy model that does enable this. Using these tools will help you make your models behave like “model” models.

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8 4

Companion apps and more second screen options with Qt

TALK: Qt On The Second Screen
SPEAKER: Christoph Sterz
COMPANY: KDAB
TRACK: Embedded

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Companion Apps, VNC remoting, streaming WebGL to the Browser or compiling your Code to WebASM – Adding a secondary screen to your application can either extend its functionality or the physical range for users operating it. Especially for Embedded Devices, offering remote monitoring, configuration or off-site maintenance adds benefit to users used to mobile and opens quick paths for support-teams to help effectively. This talk will summarize all options Qt has to offer for these needs and the usual paradigms to follow when you design your software to reach out further.

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10 1

How to optimise Qt Quick 2 applications for maximum performance

TALK: Optimizing the Rendering of Qt Quick 2 applications
SPEAKER: Giuseppe D’Angelo
COMPANY: KDAB
TRACK: Graphics & 3D

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
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 is for you. Qt Quick 2 applications are notably easy to write. With just a few lines of QML code, we can create compelling, animated, fluid, 60FPS user interfaces. From time to time, however, we may face performance problems in our UI layer, especially in constrained hardware environments (mobile or embedded). In order to tackle these problems, we need to understand the foundations of Qt Quick 2’s rendering, and how to design our code in order to extract the maximum performances from the underlying hardware. And while it is true that premature optimization is the root of all evil, avoding premature pessimization is also extremely important, especially at early stages of design of a complex application. In this talk we will introduce the main principles behind profiling and optimizing the rendering of a Qt Quick 2 application. We will start by discussing how Qt Quick 2 renders a scene – namely, through its scene graph and via OpenGL calls. We will see how to gather information about how effectively Qt Quick is rendering a scene. Some of this information is available via “secret switches”, while other requires the usage of external tools, which is therefore necessary to master. Finally, we will discuss how to fix some of the most common performance problems: poor batching, excessive overdraws, fill rate limitation, and poor texture memory utilization. Practical experience with QML application is required, and some OpenGL knowledge is beneficial (but not necessary).

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67 3

What’s new in Kuesa and Qt 3D?

TALK: What’s new in Kuesa and Qt 3D?
SPEAKER: Paul Lemire
COMPANY: KDAB
TRACK: Graphics & 3D

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Since Qt 5.7, Qt 3D has been Qt’s solution for 3D rendering. Kuesa is a layer that sits on top of Qt 3D. It provides a bridge between artists and application developers in order to maximize productivity and time to market. In this talk we will go over the new features introduced in Kuesa as well as the changes and improvements that were incorporated into Qt 3D.

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4 3

Provide a higher level of code with Qt 3D Node Editor and Shader Generator

TALK: Qt 3D Node Editor and Shader Generator
SPEAKER: Paul Lemire
COMPANY: KDAB
TRACK: Graphics & 3D

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
More and more frameworks and tools are providing higher level of development through the use of Node Editors to generate code, behaviors or entire applications. Since Qt 5.12, Qt provides support for loading a tree of nodes and convert these to generate OpenGL GLSL shader codes for Qt 3D. This can be harnessed to create a single shader description that can then be translated into different languages. This talk will present that part of the framework, show how it is used and discuss possible ideas of how that could be extended to target completely different type of features in the future.

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13 2

Why you should be using automated fuzzing to test for security issues in your code

TALK: Testing Your Code for Security Issues With Automated Fuzzing
SPEAKER: Albert Astals Cid
COMPANY: KDAB
TRACK: Tooling & Testing

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Writing secure code that deals with potentially untrusted data (parsers, importers, etc) is always hard since there are many potential cases to take into account. One of the techniques used to improve the security of such code is fuzzing. Fuzzing involves providing invalid or random data to a given piece of code to test its behaviour. Modern fuzzers are smart enough to understand what needs to be changed in the input to make the code go through a different code path making testing faster and more complete. oss-fuzz is a Free set of tools to make fuzzing of C/C++ code easier. It is comprised of various scripts and docker images, which, for example, have the base system libraries already compiled with the sanitizers. Coupling a fuzzer with the compiler sanitizers (asan, ubsan, msan) gives even better results since these sanitizers will make sure the code is run more strictly. In this session we’ll show how to fuzz a C++ codebase, as well as give you an update on how Qt is using these tools.

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4 1

Improve your code with Clang Tooling

TALK: Improving Your Code Using Clang Tooling
SPEAKER: Kevin Funk
COMPANY: KDAB
TRACK: Tooling & Testing

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
Clang is a C/C++ compiler frontend which parses C++ source code. Since the beginning of its development, the Clang ecosystem had a strong focus on providing tooling around C++. Several tools exist, which help writing or debugging C++ or even Qt code. This talk will introduce you to several highly valuable tools backed by Clang, such as the Clang compiler frontend itself (for static analysis), the Clang static analyzer (for static analysis), clang-tidy (for static analysis, linting & refactoring of source code), clang-format (for enforcing a coding style on your code), Clang Sanitizers (dynamic analysis) and last but not least: Clazy (a compiler plugin for Clang that has additional checks for Qt code). For each tool in this presentation, we’ll do a brief introduction about its capabilities and then live-demonstrate its usage on a few code examples. We’ll also demonstrate how the Clang tools can be used on projects using build systems other than CMake, by applying a few tricks. Clang is available on all major platforms, thus these tools can be used freely on either Windows, Linux or macOS. (With some limitations of the Clang Sanitizers on the Windows platform.)

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27 4

LTTng for full stack tracing

TALK: Full stack Tracing With LTTng
SPEAKER: Milian Wolff
COMPANY: KDAB
TRACK: Tooling & Testing

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
We all love and use C++ because of its performance. But how do we actually measure the performance of an application? How do we check whether an application is CPU- or I/O bound? How do we see if our application is influenced by others running on the same system? There are many good and valid answers to these questions. Tracing certainly is a very valuable addition to everyone’s toolset. It can offer in-depth insights into what a system is doing and why an application is performing in a given way. Done properly, we can use it to piece together multiple pieces of the picture: How is our hardware utilized, what is the kernel doing, what is my application doing? In this talk, we will give an introduction to LTTng, a tracing toolkit for Linux, and show how it can be applied on embedded Linux systems to get an answer to the following question: What can I do to optimize the startup time of my application? We will talk about configuring Qt and LTTng properly. We will discuss the most useful kernel trace points and demonstrate the tracing subsystem in Qt for custom user space trace points. And we will look at how to analyze the collected data in a way that doesn’t make you want to pull your hair out. The contents of this talk stem from the experience of successfully optimizing automotive Qt applications on embedded Linux applications. The lessons learned apply to a much broader audience and can also be used with other tracing toolkits such as ETW on Windows.

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30 5

Git and Gerrit essentials for Qt based work

TALK: Git and Gerrit For Working With and On Qt
SPEAKER: Kevin Funk
COMPANY: KDAB
TRACK: Tooling & Testing

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
A basic knowledge of Git is essential if you want to apply patches back to Qt or try out a not yet released version of Qt. In this talk we’re going through the most basic bits about modern software development with the code version control system Git. Beginning with the basic concepts, such as the initial setup, checking out code we will show how to manage and commit changes as well as navigate through the Git history. After having done that, we will show how to get started with the code review system in place for the Qt ecosystem, Gerrit. As part of this talk we’ll discuss how to set up your Gerrit account, how to upload your SSH keys and how to configure your Git checkout to be ready to work with Gerrit. We’ll do a small change on Qt module checkout, verify we did not break existing functionality, and then submit our change for review. This course is platform-agnostic, so the learned knowledge could be applied on either Windows, Linux or macOS. Course Contents – Initial setup and checkout of Git repositories – Managing and committing changes – Navigating through Git history – Collaboration via Gerrit code review and similar systems

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11 2

Test and profile Android applications with Qt

TALK: Testing & Profiling Qt on Android
SPEAKER: Bogdan Vatra
COMPANY: KDAB
TRACK: Tooling & Testing

Talk recorded at the Qt World Summit 2019 event in Berlin.
#QtWS19 November 2019 - BCC

TALK DESCRIPTION:
In this session, we are going to learn how to test and profile our Qt application on Android.

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26 4

Qt 3D: integrating 3D into user interfaces–Giuseppe D'Angelo, KDAB

Having 3D scenes in your application is becoming a clear trend and is likely to become even more important in the future with the growth of Virtual Reality and Augmented Reality. Up to recently, Qt allowed you to integrate with OpenGL fairly easily, but managing the rendering code itself was still a challenging task.

That's why Qt now provides a new module named Qt 3D. In this very short talk we'll introduce some of the design ideas behind Qt 3D, discuss its use cases, and show how simple it is to get 3D content in an application when using Qt 3D APIs.

82 16

Profiling QtQuick HMI Performance on Embedded Linux - Thomas McGuire

Presentation by Thomas McGuire, voice by Wieland Hagen.

QtQuick is a popular choice for creating HMIs for embedded devices. The hardware on these devices often is constrained and less performant than their desktop equivalents, this requires extra care from software developers in delivering a fluid user experience. KDAB is regularly involved with improving the performance of QtQuick HMIs on such devices for their customers.

In this demonstration, we will show how to profile and optimize the performance of a QtQuick speedometer, an example taken from an actual embedded project running on an i.MX6 board. We will show how to identify the performance bottleneck with the QML profiler in QtCreator, followed by pointing out possible solutions and then choosing the best one.

74 7

Porting Applications to Qt - Kevin Funk, KDAB

KDAB has unique experience in porting the code base for toolkits like Qt 3, Qt 4, Motif, Java, Tcl, GTK, .NET, MFC, and Photon to Qt 5. Porting legacy GUI toolkits to Qt5 is a job where proven experience saves a lot of time.

In this presentation we highlight the main problems facing developers using legacy toolkits, what migrations are and which approaches to migrations are possible. We give you a short overview of common guidelines in starting migrations including common pitfalls. We also discuss how KDAB can assist in porting your legacy code base to a modern Qt-based system using our tooling for automatic conversions.

9 0

An Unexpected C++ Journey - Daniel Vrátil (Can you use "Umlaut" in variable names in C++?)

About once a year, all of KDAB employees come together so we can get to know each other in a different way, and, among other things, introduce new members of the KDAB family, who are encouraged to give a ten-minute "newbie talk" on anything they are interested in. Last year Daniel Vrátil joined KDAB. We thought you'd enjoy his introductory talk.

63 2

Tailored static tooling using Clang: Clazy - Jean-Michaël Celerier [ACCU 2019]

#Clang #C++ #ACCUConf

There’s many patterns we learn to recognise in software, good and bad - and increasingly, we expect our compilers to spot those in our development. But we can improve on that - modern compilers give us all the building blocks to add static checking specific to a particular API, framework or even project.

Automating these checks can increase code quality, simplify code reviews, and enforce many stylistic points: for example using a particular string encoding, or avoiding certain APIs. Here we present an example of such a tool: Clazy, a plugin for the Clang compiler, focused around the Qt libraries. Clazy extends the compiler with additional warnings and checks specific to Qt, making development easier and more robust. We will show how some checks are implemented, and how this technique could be applied to other large frameworks usefully.

----------------

Jean-Michaël is a software developer at KDAB, where he works on projects using C++, Qt and OpenGL. He has been interested in C++ for 14 years and develops various open-source software for digital artists with modern C++ and Qt, in particular ossia score, a cross-platform intermedia sequencer. He is part of the Bordeaux C++ user group team.

-------------------------
Future Conferences:
ACCU 2019 Autumn Conference, Belfast (UK):
2019-11-11 and 2019-11-12.
ACCU 2020 Spring Conference, Bristol (UK), Marriott City Centre:
2020-03-24 to 2020-03-28.
-------------------------
ACCU Website: www.accu.org
ACCU Conference Website: conference.accu.org
ACCU Twitter: @ACCUConf
ACCU YouTube: https://www.youtube.com/c/ACCUConf

Filmed and Edited by Digital Medium Ltd - events.digital-medium.co.uk
Contact: events@digital-medium.co.uk

9 1

Kuesa 3D Studio Tutorial: Preparing 3D assets for realtime export

In this video, the third part of a series on using Kuesa 3D Studio, Timo Buske of KDAB gives an overview of the preparation of 3D assets for realtime export, including optimising meshes and creating a scenegraph. Find out more about Kuesa 3D at https://www.kdab.com/kuesa/

4 0