An Overview of Qt - asankar1

Agenda About Qt –A brief intro of Qt Qt development tools –Tools used for building Qt application Qt Architecture –The underlying structure and building blocks of Qt Qt for Automotive HMI –Why and how Qt can be used for automotive HMI

About Qt

What is Qt? Cross platform application framework –Linux/Embedded Linux, Windows/Windows CE –Mac OS X, Symbian, Maemo Founded by “Trolltech” and acquired by “Nokia” Free and open source Built on low level drivers of the specific platforms Supports GCC and Visual Studio C++ compilers

Advantages of Qt Platform portability Built-in library set Customizable to fit in embedded platforms Complete open source Expandable with user defined library Widely used in desktop and embedded platforms Bundled with all required development tools Good documentation and community support

Limitations of Qt Need to be built for every embedded platform No official support for open source QT Relatively less performance against native Apps.

Other Qt customers

Qt Development Tools

Qt Development tools Qt Creator: IDE for Qt application framework Qt Designer: GUI layout and forms builder Qt Assistant: Customizable document reader Qmake: Cross platform build tool

Qt Creator C++ Code editor Include Designer Build management Project management Supports standard debugging Integrated context help

Qt Designer Drag and drop Instant preview Easy to edit object properties Easy access to signals and slots Customizable standard widgets

Qt Assistant View online Qt manuals Easy navigation buttons Basic search and bookmark functions Provision to add more online source for documentation

Qmake Qt project file contains required modules list Qmake reads Qt project file and creates makefile Automatically include the library files Automatically create build rules

Qt Architecture

Qt Framework Architecture Hardware peripherals Operating System and native libraries Qt built for the underlying OS Qt APIs Qt Application

Qt Framework key features Inter-object communication through signals and slots Queryable object properties Powerful events and filters Guarded pointers

Qt Modules QtCore Core module used by other modules QtGui Allow to use UI components QtNetwork Contains classes for network programming QtOpenGL Supports OpenGL for 3D objects QtSvg Supports scalable vector graphics QtMultimedia Provides low level audio video functionality QtOpenVG Supports OpenVG rendering QtWebkit Contains classes for displaying web content

QtCore Non-GUI functionalities Abstract classes for other modules Timers, memory allocations, File handling String, semaphore and mutex handlers Event handler and thread management functions

QtGui Input controls like buttons, text, list controls etc. Forms, scroll bars, Table, Grids etc. Image controls, painter and paint engines etc. UI event handlers

QtNetwork Network access and configuration manager Ftp functions, TCP/UDP socket managers Host address, URL and cookie manager Authentication and cryptographic functions

QtOpenGL GL format and context manager GL Window surface, buffer and Widget Frame buffer object Shader compiler and linker

QtOpenVG Provides EGL based or OpenGL based OpenVG Manages VG painter, paint engine and paths 2D vector primitives functions Text drawing and pixmap drawing functions

QtSvg SVG generator SVG renderer SVG Widget Graphics SVG item

QtMultimedia Audio format settings and device info functions Audio input/output interface functions Classes for video buffer, video frame and video surface

QtWebkit Web frame, web page and web view Web history manager Web settings and plug-in factory

Qt for Automotive HMI

QtQuick Technology for modern UI UI behaviors defined using QML Integrated to Qt app by QtDeclarative module UI loadable at runtime Easy to program and visualize using QML viewer

QtQuick Designer

Cross platform Qt setup Download Qt source Build Host Qt Build Qt Simulator Configure Qt source for target Build Qt-target Copy Qt-target into target Develop Qt application Build and test using Host Qt Build the application for Qt Sim Test with simulator Build application for Qt-target Run the application from target Building Qt variants Developing Qt App

Qt advantage in automotive Easy to use and customizable UI Flexibility to update and adapt new changes Utilizes hardware to improve performance in graphics, audio and video applications Ability to integrate web contents Projects can be platform independent

Activities done so far Built embedded Qt version 4.7 Developed demo Opengl ES application Ported screen driver to use hardware acceleration Benchmarked the performance of Qt in Opengl ES

To be done in Qt Build the latest Qt version for embedded Explore the new feature QtQuick Explore the usage QtMultimedia module Develop applications with QtQuick UI and multimedia Compare the performance with commercial tools

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