Separate AWT from JVM code. (#427)

.github/workflows/blank.yml

@@ -29,7 +29,7 @@ jobs:
       - shell: bash
         run: |
           cd $GITHUB_WORKSPACE/skiko
-          ./gradlew --stacktrace --info -Pskiko.native.enabled=true jvmTest
+          ./gradlew --stacktrace --info -Pskiko.native.enabled=true awtTest
           ./gradlew --stacktrace --info -Pskiko.native.enabled=true macosX64Test
           ./gradlew --stacktrace --info -Pskiko.native.enabled=true publishToMavenLocal
       - uses: actions/upload-artifact@v2
@@ -87,7 +87,7 @@ jobs:
           sudo apt-get install ninja-build fontconfig libfontconfig1-dev libglu1-mesa-dev libxrandr-dev zip xvfb -y
           sudo Xvfb :0 -screen 0 1280x720x24 &
           export DISPLAY=:0
-          ./gradlew --stacktrace --info -Pskiko.native.enabled=true linuxX64Test jvmTest
+          ./gradlew --stacktrace --info -Pskiko.native.enabled=true linuxX64Test awtTest
           ./gradlew --stacktrace --info publishToMavenLocal
       - uses: actions/upload-artifact@v2
         with:
@@ -145,7 +145,7 @@ jobs:
       - shell: bash
         run: |
           cd ./skiko
-          ./gradlew --stacktrace --info jvmTest
+          ./gradlew --stacktrace --info awtTest
           ./gradlew --stacktrace --info publishToMavenLocal
       - uses: actions/upload-artifact@v2
         with:

README.md

@@ -110,6 +110,6 @@ Add `-Dskiko.test.ui.enabled=true` to enable UI tests (integration tests, which
 
 For example, if we want to include UI tests when we test JVM target, call this:
 ```
-./gradlew jvmTest -Dskiko.test.ui.enabled=true
+./gradlew awtTest -Dskiko.test.ui.enabled=true
 ```
 Don't run any background tasks, click mouse, or press keys during the tests. Otherwise, they probably fail.

samples/SkiaMultiplatformSample/build.gradle.kts

@@ -110,10 +110,13 @@ kotlin {
             resources.srcDirs(unzipTask.map { it.destinationDir })
         }
 
-        val macosMain by creating {
+        val darwinMain by creating {
             dependsOn(nativeMain)
         }
 
+        val macosMain by creating {
+            dependsOn(darwinMain)
+        }
 
         if (hostOs == "macos") {
             val archTargetMain = when (host) {
@@ -132,7 +135,7 @@ kotlin {
                 else -> throw GradleException("Host OS is not supported")
             }
             val iosMain by creating {
-                dependsOn(nativeMain)
+                dependsOn(darwinMain)
             }
             val iosX64Main by getting {
                 dependsOn(iosMain)

skiko/.run/test.run.xml

 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="jvmTest" type="GradleRunConfiguration" factoryName="Gradle">
+  <configuration default="false" name="awtTest" type="GradleRunConfiguration" factoryName="Gradle">
     <ExternalSystemSettings>
       <option name="executionName" />
       <option name="externalProjectPath" value="$PROJECT_DIR$" />
       <option name="externalSystemIdString" value="GRADLE" />
-      <option name="scriptParameters" value="jvmTest -Dskiko.test.ui.enabled=true -Dskiko.test.ui.renderApi=all" />
+      <option name="scriptParameters" value="awtTest -Dskiko.test.ui.enabled=true -Dskiko.test.ui.renderApi=all" />
       <option name="taskDescriptions">
         <list />
       </option>
@@ -18,4 +18,4 @@
     <DebugAllEnabled>false</DebugAllEnabled>
     <method v="2" />
   </configuration>
-</component>
+</component>
\ No newline at end of file

skiko/build.gradle.kts

@@ -214,12 +214,20 @@ val Project.supportAndroid: Boolean
     get() = findProperty("skiko.android.enabled") == "true"
 
 kotlin {
-    jvm {
+    jvm("awt") {
         compilations.all {
             kotlinOptions.jvmTarget = "11"
         }
     }
 
+    if (supportAndroid) {
+        jvm("android") {
+            compilations.all {
+                kotlinOptions.jvmTarget = "11"
+            }
+        }
+    }
+
     if (supportWasm) {
         js(IR) {
             browser() {
@@ -245,7 +253,7 @@ kotlin {
     sourceSets {
         val commonMain by getting {
             dependencies {
-                implementation(kotlin("stdlib-common"))
+                implementation(kotlin("stdlib"))
                 implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion")
             }
         }
@@ -259,18 +267,37 @@ kotlin {
         /*
         val androidMain by getting {
             dependencies {
-                compileOnly(files(androidJar()))
+
             }
         } */
 
-        val jvmMain by getting {
+        val jvmMain by creating {
+            dependsOn(commonMain)
             dependencies {
                 implementation(kotlin("stdlib"))
+                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:$coroutinesVersion")
+                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-swing:$coroutinesVersion")
+            }
+        }
+
+        val awtMain by getting {
+            dependsOn(jvmMain)
+            dependencies {
                 implementation("org.jetbrains.kotlinx:kotlinx-coroutines-swing:$coroutinesVersion")
             }
+        }
 
+        if (supportAndroid) {
+            val androidMain by getting {
+                dependsOn(jvmMain)
+                dependencies {
+                    compileOnly(files(androidJar()))
+                    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutinesVersion")
+                }
+            }
         }
-        val jvmTest by getting {
+
+        val jvmTest by creating {
             dependencies {
                 implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:$coroutinesVersion")
                 implementation(kotlin("test-junit"))
@@ -278,6 +305,16 @@ kotlin {
             }
         }
 
+        val awtTest by getting {
+            dependsOn(jvmTest)
+        }
+
+        if (supportAndroid) {
+            val androidTest by getting {
+                dependsOn(jvmTest)
+            }
+        }
+
         if (supportWasm || supportNative) {
             val nativeJsMain by creating {
                 dependsOn(commonMain)
@@ -838,7 +875,7 @@ fun generateVersionTask(targetOs: OS, targetArch: Arch) = project.tasks.register
 
 val skikoJvmJar by project.tasks.registering(Jar::class) {
     archiveBaseName.set("skiko-jvm")
-    from(kotlin.jvm().compilations["main"].output.allOutputs)
+    from(kotlin.jvm("awt").compilations["main"].output.allOutputs)
 }
 
 fun maybeSignTask(targetOs: OS, targetArch: Arch, linkJvmBindings: Provider<LinkSkikoTask>) =
@@ -1037,7 +1074,7 @@ publishing {
                 afterEvaluate {
                     artifact(entry.value.map { it.archiveFile.get() })
                     var jvmSourcesArtifact: Any? = null
-                    kotlin.jvm().mavenPublication {
+                    kotlin.jvm("awt").mavenPublication {
                         jvmSourcesArtifact = artifacts.find { it.classifier == "sources" }
                     }
                     if (jvmSourcesArtifact == null) {

skiko/src/awtMain/kotlin/org/jetbrains/skiko/Actuals.awt.kt

+package org.jetbrains.skiko
+
+import org.jetbrains.skiko.redrawer.*
+import javax.swing.UIManager
+
+actual fun setSystemLookAndFeel() = UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
+
+internal actual fun makeDefaultRenderFactory(): RenderFactory {
+    return object : RenderFactory {
+        override fun createRedrawer(
+            layer: SkiaLayer,
+            renderApi: GraphicsApi,
+            properties: SkiaLayerProperties
+        ): Redrawer = when (hostOs) {
+            OS.MacOS -> when (renderApi) {
+                GraphicsApi.SOFTWARE_COMPAT, GraphicsApi.SOFTWARE_FAST -> SoftwareRedrawer(layer, properties)
+                else -> MetalRedrawer(layer, properties)
+            }
+            OS.Windows -> when (renderApi) {
+                GraphicsApi.SOFTWARE_COMPAT -> SoftwareRedrawer(layer, properties)
+                GraphicsApi.SOFTWARE_FAST -> WindowsSoftwareRedrawer(layer, properties)
+                GraphicsApi.OPENGL -> WindowsOpenGLRedrawer(layer, properties)
+                else -> Direct3DRedrawer(layer, properties)
+            }
+            OS.Linux -> when (renderApi) {
+                GraphicsApi.SOFTWARE_COMPAT -> SoftwareRedrawer(layer, properties)
+                GraphicsApi.SOFTWARE_FAST -> LinuxSoftwareRedrawer(layer, properties)
+                else -> LinuxOpenGLRedrawer(layer, properties)
+            }
+            OS.Android -> TODO()
+            OS.JS, OS.Ios -> {
+                TODO("Commonize me")
+            }
+        }
+    }
+}

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/HardwareLayer.kt → skiko/src/awtMain/kotlin/org/jetbrains/skiko/HardwareLayer.kt

 package org.jetbrains.skiko
 
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 import java.awt.Canvas
 import java.awt.Component
 import java.awt.Graphics
 import java.awt.event.InputMethodEvent
 import javax.accessibility.Accessible
 import javax.accessibility.AccessibleContext
+import kotlin.time.ExperimentalTime
 
 internal open class HardwareLayer(
     externalAccessibleFactory: ((Component) -> Accessible)? = null
@@ -81,4 +86,51 @@ internal open class HardwareLayer(
         val res = _externalAccessible?.accessibleContext
         return res ?: super.getAccessibleContext()
     }
+}
+
+/**
+ * HardwareLayer should not dispose native resources while [scope] is active.
+ *
+ * So wait for scope cancellation in dispose method:
+ * ```
+ *  runBlocking {
+ *      frameJob.cancelAndJoin()
+ *  }
+ * ```
+ *
+ * Can be accessed from multiple threads.
+ */
+@OptIn(ExperimentalTime::class)
+@Suppress("UNUSED_PARAMETER")
+internal fun FrameLimiter(
+    scope: CoroutineScope,
+    component: HardwareLayer,
+    onNewFrameLimit: (frameLimit: Double) -> Unit = {}
+): FrameLimiter {
+    val state = object {
+        @Volatile
+        var frameLimit = MinMainstreamMonitorRefreshRate
+    }
+
+    val frames = Channel<Unit>(Channel.CONFLATED)
+    frames.trySend(Unit)
+
+    scope.launch {
+        while (true) {
+            frames.receive()
+            // TODO will lockLinuxDrawingSurface inside getDisplayRefreshRate can cause draw lock too?
+            // it takes 2ms on my machine on Linux (0.01ms on macOs, 0.1ms on Windows)
+            state.frameLimit = component.getDisplayRefreshRate()
+            onNewFrameLimit(state.frameLimit)
+            delay(1000)
+        }
+    }
+
+    return FrameLimiter(
+        scope,
+        frameMillis = {
+            frames.trySend(Unit)
+            (1000 / state.frameLimit).toLong()
+        }
+    )
 }
\ No newline at end of file

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/PlatformOperations.kt → skiko/src/awtMain/kotlin/org/jetbrains/skiko/PlatformOperations.kt

@@ -74,13 +74,13 @@ internal val platformOperations: PlatformOperations by lazy {
                 override fun isFullscreen(component: Component): Boolean {
                     val window = SwingUtilities.getRoot(component) as Window
                     val device = window.graphicsConfiguration.device
-                    return device.getFullScreenWindow() == window
+                    return device.fullScreenWindow == window
                 }
 
                 override fun setFullscreen(component: Component, value: Boolean) {
                     val window = SwingUtilities.getRoot(component) as Window
                     val device = window.graphicsConfiguration.device
-                    device.setFullScreenWindow(if (value) window else null)
+                    device.fullScreenWindow = if (value) window else null
                 }
 
                 override fun disableTitleBar(component: Component, headerHeight: Float) {
@@ -99,13 +99,13 @@ internal val platformOperations: PlatformOperations by lazy {
                 override fun isFullscreen(component: Component): Boolean {
                     val window = SwingUtilities.getRoot(component) as Window
                     val device = window.graphicsConfiguration.device
-                    return device.getFullScreenWindow() == window
+                    return device.fullScreenWindow == window
                 }
 
                 override fun setFullscreen(component: Component, value: Boolean) {
                     val window = SwingUtilities.getRoot(component) as Window
                     val device = window.graphicsConfiguration.device
-                    device.setFullScreenWindow(if (value) window else null)
+                    device.fullScreenWindow = if (value) window else null
                 }
 
                 override fun disableTitleBar(component: Component, headerHeight: Float) {

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/SkiaLayer.jvm.kt → skiko/src/awtMain/kotlin/org/jetbrains/skiko/SkiaLayer.awt.kt

 package org.jetbrains.skiko
 
 import org.jetbrains.skia.*
-import org.jetbrains.skiko.context.ContextHandler
 import org.jetbrains.skiko.redrawer.Redrawer
 import java.awt.Color
 import java.awt.Component

skiko/src/awtMain/kotlin/org/jetbrains/skiko/redrawer/Actuals.awt.kt

+package org.jetbrains.skiko.redrawer
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.MainCoroutineDispatcher
+import kotlinx.coroutines.swing.Swing
+
+actual val MainUIDispatcher: MainCoroutineDispatcher
+    get() = Dispatchers.Swing

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/redrawer/LinuxOpenGLRedrawer.kt → skiko/src/awtMain/kotlin/org/jetbrains/skiko/redrawer/LinuxOpenGLRedrawer.kt

 package org.jetbrains.skiko.redrawer
 
 import kotlinx.coroutines.*
-import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skiko.*
 import org.jetbrains.skiko.context.OpenGLContextHandler
 
@@ -97,7 +96,7 @@ internal class LinuxOpenGLRedrawer(
             .filterNot(LinuxOpenGLRedrawer::isDisposed)
             .filter { it.layer.isShowing }
 
-        private val frameDispatcher = FrameDispatcher(Dispatchers.Swing) {
+        private val frameDispatcher = FrameDispatcher(MainUIDispatcher) {
             toRedrawCopy.addAll(toRedraw)
             toRedraw.clear()
 

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/redrawer/WindowsOpenGLRedrawer.kt → skiko/src/awtMain/kotlin/org/jetbrains/skiko/redrawer/WindowsOpenGLRedrawer.kt

@@ -6,7 +6,6 @@ import kotlinx.coroutines.swing.Swing
 import kotlinx.coroutines.withContext
 import org.jetbrains.skiko.*
 import org.jetbrains.skiko.context.OpenGLContextHandler
-import org.jetbrains.skiko.context.SoftwareContextHandler
 
 internal class WindowsOpenGLRedrawer(
     private val layer: SkiaLayer,

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/FrameLimiter.kt

 package org.jetbrains.skiko
 
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -9,53 +8,6 @@ import kotlin.time.ExperimentalTime
 
 private const val NanosecondsPerMillisecond = 1_000_000L
 
-/**
- * HardwareLayer should not dispose native resources while [scope] is active.
- *
- * So wait for scope cancellation in dispose method:
- * ```
- *  runBlocking {
- *      frameJob.cancelAndJoin()
- *  }
- * ```
- *
- * Can be accessed from multiple threads.
- */
-@OptIn(ExperimentalTime::class)
-@Suppress("UNUSED_PARAMETER")
-internal fun FrameLimiter(
-    scope: CoroutineScope,
-    component: HardwareLayer,
-    onNewFrameLimit: (frameLimit: Double) -> Unit = {}
-): FrameLimiter {
-    val state = object {
-        @Volatile
-        var frameLimit = MinMainstreamMonitorRefreshRate
-    }
-
-    val frames = Channel<Unit>(Channel.CONFLATED)
-    frames.trySend(Unit)
-
-    scope.launch {
-        while (true) {
-            frames.receive()
-            // TODO will lockLinuxDrawingSurface inside getDisplayRefreshRate can cause draw lock too?
-            // it takes 2ms on my machine on Linux (0.01ms on macOs, 0.1ms on Windows)
-            state.frameLimit = component.getDisplayRefreshRate()
-            onNewFrameLimit(state.frameLimit)
-            delay(1000)
-        }
-    }
-
-    return FrameLimiter(
-        scope,
-        frameMillis = {
-            frames.trySend(Unit)
-            (1000 / state.frameLimit).toLong()
-        }
-    )
-}
-
 /**
  * Limit the duration of the frames (to avoid high CPU usage) to [frameMillis].
  * The actual delay depends on the precision of the system timer

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/GraphicsApi.jvm.kt

@@ -19,7 +19,7 @@ internal fun isVideoCardSupported(renderApi: GraphicsApi): Boolean {
                 if (it == null) { return false }
             }
             adaptersList.forEach {
-                if (adapter.startsWith(it)) {
+                if (adapter?.startsWith(it) == true) {
                     return false
                 }
             }

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/OpenGLApi.kt

@@ -23,7 +23,7 @@ class OpenGLApi private constructor() {
     external fun glEnable(flag: Int)
     external fun glBindTexture(target: Int, texture: Int)
     external fun glGetIntegerv(pname: Int): Int
-    external fun glGetString(value: Int): String
+    external fun glGetString(value: Int): String?
 
     companion object {
         init {

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/RenderFactory.kt

@@ -10,32 +10,4 @@ internal interface RenderFactory {
     }
 }
 
-private fun makeDefaultRenderFactory(): RenderFactory {
-    return object : RenderFactory {
-        override fun createRedrawer(
-            layer: SkiaLayer,
-            renderApi: GraphicsApi,
-            properties: SkiaLayerProperties
-        ): Redrawer = when (hostOs) {
-            OS.MacOS -> when (renderApi) {
-                GraphicsApi.SOFTWARE_COMPAT, GraphicsApi.SOFTWARE_FAST -> SoftwareRedrawer(layer, properties)
-                else -> MetalRedrawer(layer, properties)
-            }
-            OS.Windows -> when (renderApi) {
-                GraphicsApi.SOFTWARE_COMPAT -> SoftwareRedrawer(layer, properties)
-                GraphicsApi.SOFTWARE_FAST -> WindowsSoftwareRedrawer(layer, properties)
-                GraphicsApi.OPENGL -> WindowsOpenGLRedrawer(layer, properties)
-                else -> Direct3DRedrawer(layer, properties)
-            }
-            OS.Linux -> when (renderApi) {
-                GraphicsApi.SOFTWARE_COMPAT -> SoftwareRedrawer(layer, properties)
-                GraphicsApi.SOFTWARE_FAST -> LinuxSoftwareRedrawer(layer, properties)
-                else -> LinuxOpenGLRedrawer(layer, properties)
-            }
-            OS.Android -> TODO()
-            OS.JS, OS.Ios -> {
-                TODO("Commonize me")
-            }
-        }
-    }
-}
+internal expect fun makeDefaultRenderFactory(): RenderFactory

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/Setup.kt

 package org.jetbrains.skiko
 
-import javax.swing.UIManager
+expect fun setSystemLookAndFeel()
 
 internal object Setup {
     fun init(
@@ -22,7 +22,7 @@ internal object Setup {
         try {
             if (globalLAF) {
                 // Setup menu look and feel.
-                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
+                setSystemLookAndFeel()
             }
             if (useScreenMenuBar) {
                 System.setProperty("apple.laf.useScreenMenuBar", "true")

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/redrawer/AbstractDirectSoftwareRedrawer.kt

@@ -2,7 +2,6 @@ package org.jetbrains.skiko.redrawer
 
 import org.jetbrains.skia.Surface
 import kotlinx.coroutines.*
-import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skiko.FrameDispatcher
 import org.jetbrains.skiko.FrameLimiter
 import org.jetbrains.skiko.RenderException
@@ -19,7 +18,7 @@ internal abstract class AbstractDirectSoftwareRedrawer(
 
     private val frameJob = Job()
     private val frameLimiter = FrameLimiter(CoroutineScope(Dispatchers.IO + frameJob), layer.backedLayer)
-    private val frameDispatcher = FrameDispatcher(Dispatchers.Swing) {
+    private val frameDispatcher = FrameDispatcher(MainUIDispatcher) {
         if (properties.isVsyncEnabled && properties.isVsyncFramelimitFallbackEnabled) {
             frameLimiter.awaitNextFrame()
         }

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/redrawer/AngleRedrawer.kt

@@ -20,7 +20,7 @@ internal class AngleRedrawer(
     private var isDisposed = false
     private var device: Long = 0
 
-    private val frameDispatcher = FrameDispatcher(Dispatchers.Swing) {
+    private val frameDispatcher = FrameDispatcher(MainUIDispatcher) {
         if (layer.isShowing) {
             update(System.nanoTime())
             draw()

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/redrawer/Direct3DRedrawer.kt

@@ -25,7 +25,7 @@ internal class Direct3DRedrawer(
         }
     }
 
-    private val frameDispatcher = FrameDispatcher(Dispatchers.Swing) {
+    private val frameDispatcher = FrameDispatcher(MainUIDispatcher) {
         if (layer.isShowing) {
             update(System.nanoTime())
             draw()

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/redrawer/SoftwareRedrawer.kt

 package org.jetbrains.skiko.redrawer
 
 import kotlinx.coroutines.*
-import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skiko.FrameDispatcher
 import org.jetbrains.skiko.FrameLimiter
 import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.SkiaLayerProperties
-import org.jetbrains.skiko.context.MetalContextHandler
 import org.jetbrains.skiko.context.SoftwareContextHandler
 
+expect val MainUIDispatcher: MainCoroutineDispatcher
+
 internal class SoftwareRedrawer(
     private val layer: SkiaLayer,
     private val properties: SkiaLayerProperties
@@ -19,7 +19,7 @@ internal class SoftwareRedrawer(
     private val frameJob = Job()
     private val frameLimiter = FrameLimiter(CoroutineScope(Dispatchers.IO + frameJob), layer.backedLayer)
 
-    private val frameDispatcher = FrameDispatcher(Dispatchers.Swing) {
+    private val frameDispatcher = FrameDispatcher(MainUIDispatcher) {
         if (properties.isVsyncEnabled && properties.isVsyncFramelimitFallbackEnabled) {
             frameLimiter.awaitNextFrame()
         }

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/redrawer/WindowsSoftwareRedrawer.kt

@@ -5,8 +5,8 @@ import org.jetbrains.skiko.SkiaLayerProperties
 import org.jetbrains.skiko.RenderException
 
 internal class WindowsSoftwareRedrawer(
-    private val layer: SkiaLayer,
-    private val properties: SkiaLayerProperties
+    layer: SkiaLayer,
+    properties: SkiaLayerProperties
 ) : AbstractDirectSoftwareRedrawer(layer, properties) {
 
     init {

skiko/src/macosMain/kotlin/org/jetbrains/skiko/redrawer/MetalRedrawer.macos.kt

@@ -65,13 +65,13 @@ internal class MacOsMetalRedrawer(
 
     override fun syncSize() {
         syncContentScale()
-        val osView = skiaLayer.nsView!!
-        val (w, h) = osView.frame.useContents {
+        val osFrame = skiaLayer.nsView.frame
+        val (w, h) = osFrame.useContents {
             size.width to size.height
         }
         CATransaction.begin()
         CATransaction.setDisableActions(true)
-        metalLayer.frame = osView.frame
+        metalLayer.frame = osFrame
         metalLayer.init(skiaLayer, contextHandler, device)
         metalLayer.drawableSize = CGSizeMake(w * metalLayer.contentsScale, h * metalLayer.contentsScale)
         CATransaction.commit()