Introduction

This layer contains recipes and classes for building Slint's C++ API, as well as the Rust based demos.

For a Rust based application using Slint, use meta-rust directly,

For a C++ based application, the recipes in this layer assume that your application is built using CMake and uses find_package(Slint) to locate Slint, and then uses slint_target_sources to compile .slint files to C++ as well as links against Slint::Slint. For more details, check out our C++ Getting Started. When creating a Bitbake recipe for, use this layer, and in your application's recipe inherit from cmake and slint.

Prerequisites

Meta-slint requires:

meta-openembedded/meta-oe
meta-rust-bin

Check the layer.conf LAYERSERIES_COMPAT_meta for yocto version compatibility

By default, yocto will pick the _git recipe of slint-cpp, which means the development version of Slint will be built. To select a specific Slint version, in your conf/local.conf, set set PREFERRED_VERSION_slint-cpp = "x.x.x" and PREFERRED_VERSION_slint-cpp-native = "x.x.x".

Features

For git builds and builds from Slint version 1.3 onwards, certain features are configurable via PACKAGECONFIG.

Feature Name	Description	Enabled by Default
renderer-skia	Skia OpenGL renderer	No
renderer-femtovg	Lightweight FemtoVG OpenGL renderer	Yes
backend-linuxkms	Backend for rendering via KMS/DRM	No
interpreter	C++ API for Slint Interpreter	Yes

Set the PACKAGECONFIG:pn-slint-cpp variable in your conf/local.conf to tweak. For example, to disable the FemtoVG renderer, enable Skia, and the linuxkms backend, set them like this:

PACKAGECONFIG:append:pn-slint-cpp = " backend-linuxkms renderer-skia "
PACKAGECONFIG:remove:pn-slint-cpp = " renderer-femtovg "

Compiling the Skia Renderer

The Skia renderer requires clang to compile. The meta-clang layer provides current versions of clang that work with the recipes in this layer.

Building an SDK that contains Slint

With Slint version 1.3 or newer, the nativesdk-slint-cpp package allows for including Slint in your SDK, so that CMake based applications that use Slint and the Slint C++ compiler can be used.

Either add the package to your corresponding package groups or add the following to your conf/local.conf:

TOOLCHAIN_HOST_TASK:append = " nativesdk-slint-cpp"

Building an SDK for external Slint builds

A regular Yocto SDK should be suitable for building Slint against, out of the box. Make sure to source your environment-setup before invoking cmake on the Slint build, and pass -DRust_CARGO_TARGET=<your triplet>.

If your build of Slint enables the Skia renderer (SLINT_FEATURE_RENDERER_SKIA), make sure to include the meta-clang layer in your project and set CLANGSDK = "1" in your conf/local.conf before running the populate_sdk task on your image.

Demo Images

STM32 MPU OpenSTLinux

When building for STM32 MPU OpenSTLinux, adding this meta-slint layer to your environment enables an additional st-example-image-slint image target. In your conf/local.conf set DISTRO = "openstlinux-eglfs" and run bitbake st-example-image-slint to build an image that ships various Slint demos in a minimal image. The demos run directly on the framebuffer with the LinuxKMS backend.

(Tested on stm32mp157-disco)

F&S Elektronik Systeme

When building for F&S Elektronik meta-fus, adding this meta-slint layer to your environment enables an additional fus-image-slint-demos image target.

Steps:

• Add meta-slint
• Add meta-clang
• Add meta-rust
• Edit your conf/local.conf:
  • Make sure DISTRO is set to "fus-imx-wayland"
  • Select the Rust version from meta-rust by adding this line (adjust path to layer accordingly): include ../../sources/meta-rust/conf/distro/include/rust_versions.inc
• Run bitbake fus-image-slint-demos to build an image that ships various Slint demos in a minimal image. The demos run directly on the framebuffer with the LinuxKMS backend.