Qt Quick Ultralite maintains source compatibility between minor releases. However, some changes may require you to adapt the application code accordingly. The following sections highlight such changes:

Important changes

• Added support for Infineon TRAVEO™ T2G CYT4EN (Technology Preview).
• Deprecated the Application QML type and added the ApplicationScreens QML type as a replacement.

New features

• Added the Studio.Components module and the ArcItem studio component.
• Refactored StaticText implementation to make its layout similar to Text, irrespective of the font engine in use. It also ensures that multi-line StaticText items align better when scaled, and their implicit horizontal alignment is correct.
• Updates to demos and examples:
  • Updated the automotive demo to control its simulation using the hardware buttons.
  • Added Benchmark mode to watch demo.
• Added the QUL_PLATFORM_DEFAULT_LAYER_RENDERING_HINTS CMake variable to enable configuring the platform layer engine with default rendering hints.
• Added support for fill paths with linear gradients:
  • Added the DrawingEngine APIs.
  • Added the Gradient QML type to enable drawing ShapePath and Rectangle with linear gradients.
  • Added support for hardware accelerated blending of linear gradients on the Infineon TRAVEO™ T2G and NXP i.MX RT1170 reference boards.
• Fixed GUI freeze on the Desktop backend if an error occurs in the Core library. The backend now has a error handler to stop execution if an error is detected.
• Fixed duplicate file warnings when building with IAR.
• Fixed qulrcc to use better hashing techniques to avoid name conflicts if an application uses large no. of images.
• Fixed compiler and linker warnings when building with the ARM GCC 12.x toolchain.
• Fixes to demos and examples:
  • Increased the text cache size to improve render performance for thermo demo on STM32 boards.
  • Updated the freertos-multitask example to show how using queues to set Qt Quick Ultralite properties, and communicate bi-directionally between the Qt Quick Ultralite and other threads.
  • Updated the Shapes example to show linear gradients usage.
• Refactored qmltocpp to make sure that it generates better code for empty structs. This improves flash memory footprint (3% to 7%) depending on the application.
• Upgrades:
  • TRAVEO™ T2G CYT4DN SDK version 2e.2.0.
  • TRAVEO™ T2G Sample Driver Library (SDL) version 7.9.0.
• QmlProject updates:
  • Added Project.supportedLanguages property to list the supported languages.
  • Added Project.primaryLanguage property to configure the default language.
  • Added sanity check to enable verifying the nodes and properties in a qmlproject file.
  • Added the MCU.Config.displayRotationAngle property to control the clockwise rotation angle.
• Added support for defining a Connections signal handler using the function syntax.
• Added support for Text.StyledText textFormat in a StaticText item. This enables adding inline images (with size) using HTML tags.
• Added Qul::PlatformInterface::ImageDecoder API to enable implementing custom image decoder. See Image decoder integration for more information.
• Added support for configuring a rotation angle for the entire application to match orientation of the physical display. See MCU.Config.displayRotationAngle QmlProject property for more information.

Fixed issues

Qt for MCUs v2.7.1

• Fixed layer positioning when display rotation angle is set to 90 or 270.
• Fixed qmlprojectexporter to enable faster export of larger projects. Use the --parallel or -j command-line to parallel process the QML files.
• Fixed linking errors when building the image_cache example for Renesas RH850 on AUTOSAR.
• Fixes to qmltocpp:
  • Generate the includes list in the correct order.
  • Qualify type with module names if the are used outside its module.
  • Make parent property available to the inline component declaration object to avoid a crash.
  • Improve anchor binding inside the inline component when it is used as a sourceComponent for Loader.
  • Check if a custom property of type Component is used as a binding for souceComponent to avoid a crash.
  • Fix crash on accessing object aliases from other QML files.
• Fixed QulPerf to make the performance metric values are updated only if the recording is enabled.
• Fixed image decoder to avoid a crash on STM when images are smaller than the input buffer.
• Fixed sprite_animations example to avoid rendering artifacts.
• Fixed host tools qulrcc, qmltocpp, and fontcompiler to make sure the generated code is consistent.
• Fixed error loading the QtQuick.Controls module with generateQmltypes enabled. The qmlprojectexporter needs the --qml-mappings-dir argument to load such modules and also provide more information if those modules are not found.

Qt for MCUs v2.7.0

• qmlprojectexporter fixes:
  • Check and remove duplicate entries in the QmlFiles node.
  • Check the type of the files in different files node to make sure they are relevant for that node.
  • Collect font files from the modules.
  • Warn if the TranslationFiles.MCU.omitSourceLanguage QmlProject property is not true when using ID-based translation.
  • Fixed CMake logic to report useful error messages if qmlprojectexporter fails due to missing dependencies.
  • Don't use system Clang with installed builds.
• qmltocpp fixes:
  • Generate C++ code based on the C++ standard of the project.
  • Accept object pointer in function arguments.
  • Fix logic to lookup the signal handler (with "on" prefix) for properties before considering a C++ function as the signal handler.
  • Consider when condition for default states.
  • Consider the declared state property before the StateChangeEvent.
  • Improve code generated from QML to avoid empty structs, improving flash memory footprint from 3 % to 7 % depending on the application.
• Changed the CheckBox::checkState enums to be consistent with Qt.
• Fixed wrong positioning and rendering glitches with transformed text because of one pixel offset.
• Fixed the wrong spacing between the glyphs while rendering complex text with Spark font engine.
• Fixed duplicate definition warning on STM32H750B-DISCO with ARM GCC.
• fontcompiler fixes:
  • Use enough memory for heap and glyph cache when using Spark font engine.
  • Exit gracefully after printing an error message on QUL_ASSERT.
• Fixed GHS 2018 compiler warnings while building for Renesas RH850.
• Improve ArcItem implementation to make sure it is compatible with Qt Quick.
• Fixed implementation for Item to make sure the visibility updates consider the property binding on its visible property.
• Fixed the heap structure field for thermo_demo (benchmark mode) on IAR baremetal platforms, to avoid wrong heap usage report.
• Updated the FreeType rasterizer to support the ARGB32_Premultiplied and ARGB4444_Premultiplied formats.
• Fixed CMake logic to find the correct path to the Clang resources.

New APIs

APIs for application development

• New QML Types
• New QML Properties

New QML Types

New QML Properties

QML Type Rectangle:

QML Type ShapePath:

APIs for platform development

• New Classes
• New Global Functions

New Classes

New Global Functions

Changes in Previous Versions