Skiko (short for Skia for Kotlin) is the graphical library exposing significant part of Skia library APIs to Kotlin, along with the gluing code for rendering context.
Supported platforms:
- Kotlin/JVM on Linux(x86_64 and arm64)
- Kotlin/JVM on Windows(x86_64)
- Kotlin/JVM on macOS(x86_64 and arm64)
- Kotlin/JVM on Android(x86_64 and arm64), starting with API version 24
- Kotlin/JS + WebAssembly in browsers
- Kotlin/Native on iOS(arm64 and x64)
- Kotlin/Native on macOS (arm64 and x64)
See autogenerated API docs at https://jetbrains.github.io/skiko/
To use in build scripts one has to compute appropriate target platform and version, i.e. something like this
repositories {
mavenCentral()
maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
}
val osName = System.getProperty("os.name")
val targetOs = when {
osName == "Mac OS X" -> "macos"
osName.startsWith("Win") -> "windows"
osName.startsWith("Linux") -> "linux"
else -> error("Unsupported OS: $osName")
}
val osArch = System.getProperty("os.arch")
val targetArch = when (osArch) {
"x86_64", "amd64" -> "x64"
"aarch64" -> "arm64"
else -> error("Unsupported arch: $osArch")
}
val version = "0.8.9" // or any more recent version
val target = "${targetOs}-${targetArch}"
dependencies {
implementation("org.jetbrains.skiko:skiko-awt-runtime-$target:$version")
}
Simple example for Kotlin/JVM
fun main() {
val skiaLayer = SkiaLayer()
skiaLayer.renderDelegate = SkiaLayerRenderDelegate(skiaLayer, object : SkikoRenderDelegate {
val paint = Paint().apply {
color = Color.RED
}
override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
canvas.clear(Color.CYAN)
val ts = nanoTime / 5_000_000
canvas.drawCircle( (ts % width).toFloat(), (ts % height).toFloat(), 20f, paint )
}
})
SwingUtilities.invokeLater {
val window = JFrame("Skiko example").apply {
defaultCloseOperation = WindowConstants.EXIT_ON_CLOSE
preferredSize = Dimension(800, 600)
}
skiaLayer.attachTo(window.contentPane)
skiaLayer.needRedraw()
window.pack()
window.isVisible = true
}
}
Simple example for iOS
fun main() {
val args = emptyArray<String>()
memScoped {
val argc = args.size + 1
val argv = (arrayOf("skikoApp") + args).map { it.cstr.ptr }.toCValues()
autoreleasepool {
UIApplicationMain(argc, argv, null, NSStringFromClass(SkikoAppDelegate))
}
}
}
class SkikoAppDelegate : UIResponder, UIApplicationDelegateProtocol {
companion object : UIResponderMeta(), UIApplicationDelegateProtocolMeta
@ObjCObjectBase.OverrideInit
constructor() : super()
private var _window: UIWindow? = null
override fun window() = _window
override fun setWindow(window: UIWindow?) {
_window = window
}
override fun application(application: UIApplication, didFinishLaunchingWithOptions: Map<Any?, *>?): Boolean {
window = UIWindow(frame = UIScreen.mainScreen.bounds)
window!!.rootViewController = SkikoViewController(
SkikoUIView(
SkiaLayer().apply {
renderDelegate = SkiaLayerRenderDelegate(skiaLayer, object : SkikoRenderDelegate {
val paint = Paint().apply { color = Color.RED }
override fun onRender(canvas: Canvas, width: Int, height: Int, nanoTime: Long) {
canvas.clear(Color.CYAN)
val ts = nanoTime / 5_000_000
canvas.drawCircle( (ts % width).toFloat(), (ts % height).toFloat(), 20f, paint )
}
})
}
)
)
window!!.makeKeyAndVisible()
return true
}
}
See this sample for complete example.
To use latest development snapshot use version 0.0.0-SNAPSHOT
.