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

New features

• Added QUL_PLATFORM_DEFAULT_BINARY_ASSET_OPTIONS to enable configuring how the asset data binaries are included in the application binary.
• Compiler, graphics driver, and SDK upgrades:
  • ARM GCC compiler v10.3.
  • IAR compiler 9.20.4.
  • Graphics Driver v1e.1.0 for Traveo II Cluster Series
  • MCUXPresso SDK v2.11.1
• Added support for the RK055HDMIPI4MA0 display on NXP RT1170.
• Added the QUL_RH850_FLASH_TYPE and QUL_RH850_RAM_TYPE configure options to enable using Octa flash and Octa RAM for resource data.
• Added support to build the tviic2d6m-baremetal platform using the IAR 8.22 Functional Safety compiler.
• Added the Text.wrapMode API.
• Added error notification API to enable applications handle Qt Quick Ultralite errors gracefully. Refer to Error handling for more information.
• Added the qul_generate_flash_target CMake command to generate flash target.
• Added the texture() and textureCount() functions to access texture data.
• Added the performance and footprint guide to enable using Qt for MCUs optimally.
• Added Monotype FontmapEditor support for the Linux host, and upgraded it to the latest version.

Fixed issues

Qt for MCUs v2.2.4

• Fixed CMP0083 CMake policy error while building for the Linux desktop.
• Fixed the following in the Animation logic:
  • Avoid wrong QulError_Animation_ProgressOutOfRange assertions, while checking if the given value is within (0-1) bounds.
  • Trigger signals for standalone and top-level animations only to improve compatibility with Qt Quick animation.
• Fixed inconsistency in handling resource properties for resources with custom BASE and PREFIX.
• Fixed qmltocpp to prevent removing a function call with unused return value.
• Fixed the CMake configuration with Ninja to display progress of the flashing tool.
• Fixed the NXP platform port to avoid queries for touch data when there are no touch interrupts.
• Fixed stack size calculation logic to avoid the array-bounds compiler warning.
• Fixed unexpected artifacts on STM32H750B while running the swipe_game demo MinSizeRel build.
• Fixed fontcompiler to avoid wrong size for the glyphMap.
• Fixed the UI update logic to make sure that a Qul::Property::setValue call triggers a repaint.
• Fixed the CMake config for the automotive demo to include HMI sources.
• Fixed the interrupt_handler example to make sure the user button press behavior is consistent on all platforms.

Qt for MCUs v2.2.3

• Fixed type cast error on property change event for properties of type std::string.
• fontcompiler fixes:
  • Handle space characters in the font.unicodeCoverage list.
  • Avoid superfluous glyph not found warnings.
• Fixed rendering issues with a rectangle item that is at the center of its parent rectangle. This improves compatibility between QtQuick and Qt Quick Ultralite.
• Fixed segfault while evaluating properties that are not initialized.
• Fixed Text item to ensure that it handles the clip property like a standard QtQuick text item does.
• Fixed 24bpp blending on STM32F469I-Disco boards.
• Fixed Cypress Traveo II kit (JSON) file to ensure Qt Creator has all the necessary information to create a kit.
• Fixed touch handling on STM32F769I boards with the IAR toolchain, to also include the touch events outside the interrupt context.
• Fixed Text item to ensure line breaks for items with the Text.WordWrap as wrap mode, complies with the Unicode line break algorithm.
• Fixed division by zero if an Animation has its duration set to zero while the animation is active.
• Fixed crash on deleting the dirty render nodes.
• Fixed Property to avoid QulError_PropertyBase_DependencyNodesNotMarkedDirty assertions if a property has a combination of bindings and transitions. This also avoids the assertion if the property changes several times.
• Fixed fontcompiler to include only the unique characters into the Spark font engine cache priming data, ignoring duplicates in the font.unicodeCoverage list.

Qt for MCUs v2.2.2

• Fixed CMake logic to ignore the JDK found in the system environment while trying to find JLink.
• Fixed build type check for the multi-config generators such as MSVC to ensure that the default build type is correct.
• Fixed rendering artifacts on Cypress Traveo II with the shapes example built using the IAR toolchain.
• Fixed performance logging issues with a custom exec loop.
• Fixed issues related to flashing binaries onto the STM devices.

Qt for MCUs v2.2.1

• Fixed the logic used for auto-generation of static text translation arrays, to ensure that they are always stored in flash.
• Fixed the platform port for Infineon Traveo II to avoid the rounded rectangle blending artifacts with OTF windows.
• Fixed slower animation loops on the STM platform.
• Updated PauseAnimation and TimeLineAnimation to be based on the timestamp to avoid running them longer than expected.
• Fixed performance issues that was caused by frequent calls to the DrawingEngine::blendPath() function.
• Fixed the qmlcompiler to improve the error messages related to the invalid QML filename.
• Fixed following issues in the Desktop simulator:
  • Render quality when system scaling is enabled.
  • Default build type for applications on Windows is set to Release.

Qt for MCUs v2.2.0

• Optimized bindings to reduce code size by around 3-15% depending on the toolchain and the application.
• Fixed text layout to not include leading (font metric) in line height. This improves compatibility between Qt Quick and Qt Quick Ultralite.
• Fixed layers ignoring visible property and ensure that the property is also propagated to the layer's children.
• Fixed packaging to ensure that the compatibility sources are included.
• Optimized qulrcc to ensure that the raw binary data is aligned properly.
• Optimized the Screen and ItemLayer types to warn about wrong usage.
• Fixed inconsistent behavior in qulrcc when a qul_add_resource has BASE and PREFIX defined.
• Updated NXT RT1170 platform port to use a series of bezier curves instead of an arc.
• Fixed the font data array address alignment issue.
• Updated Qt Quick Ultralite to be compatible with Qt 6.2.4.
• Fixed memory manager to skip aligning memory in case of a nullptr.
• Fixed the Chess example to handle the turn indicator's location based on the screen orientation.
• Fixed rendering issues on Traveo II with Green Hills toolchain.
• Refactored blending logic to avoid flickering on STM32H750B.

New APIs

APIs for application development

• New Member Functions
• New Functions in Namespaces
• New Global Functions
• New QML Properties

New Member Functions

Class SharedImage:

New Functions in Namespaces

New Global Functions

New QML Properties

QML Type Text:

APIs for platform development

• New Global Functions
• New Macros

New Global Functions

New Macros

Changes in Previous Versions