Changed SkiaLayer to contain HardwareLayer rather than inherit from it.

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

@@ -13,52 +13,26 @@ abstract class HardwareLayer : Canvas() {
 
     // getDpiScale is expensive operation on some platforms, so we cache it
     private var _contentScale: Float? = null
-    private var isInit = false
 
-    init {
-        @Suppress("LeakingThis")
-        addHierarchyListener {
-            if (it.changeFlags and HierarchyEvent.SHOWING_CHANGED.toLong() != 0L) {
-                checkIsShowing()
-            }
-        }
-    }
-
-    private fun checkIsShowing() {
-        if (!isInit && isShowing) {
+    internal fun defineContentScale() {
         _contentScale = getDpiScale()
-            init()
-            isInit = true
-        }
     }
 
 
-    protected open fun init() {
+    internal open fun init() {
         useDrawingSurfacePlatformInfo(::nativeInit)
     }
 
     protected open external fun nativeInit(platformInfo: Long)
 
-    open external fun dispose()
-
-    protected open fun contentScaleChanged() = Unit
-
-    override fun setBounds(x: Int, y: Int, width: Int, height: Int) {
-        super.setBounds(x, y, width, height)
-        checkContentScale()
-    }
-
-    override fun paint(g: Graphics) {
-        checkContentScale()
-    }
-
     // TODO checkContentScale is called before init. it is ok, but when we fix getDpiScale on Linux we should check [isInit]
-    private fun checkContentScale() {
+    internal fun checkContentScale(): Boolean {
         val contentScale = getDpiScale()
         if (contentScale != _contentScale) {
             _contentScale = contentScale
-            contentScaleChanged()
+            return true
         }
+        return false
     }
 
     private fun getDpiScale(): Float {
@@ -67,12 +41,6 @@ abstract class HardwareLayer : Canvas() {
         return scale
     }
 
-    // Should be called in Swing thread
-    internal abstract fun update(nanoTime: Long)
-
-    // Should be called in the OpenGL thread, and only once after update
-    internal abstract fun draw()
-
     val windowHandle: Long
         get() = useDrawingSurfacePlatformInfo(::getWindowHandle)
 

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

@@ -15,7 +15,7 @@ internal interface PlatformOperations {
     fun isFullscreen(component: Component): Boolean
     fun setFullscreen(component: Component, value: Boolean)
     fun getDpiScale(component: Component): Float
-    fun createRedrawer(layer: HardwareLayer, renderApi: GraphicsApi, properties: SkiaLayerProperties): Redrawer
+    fun createRedrawer(layer: SkiaLayer, renderApi: GraphicsApi, properties: SkiaLayerProperties): Redrawer
 }
 
 internal val platformOperations: PlatformOperations by lazy {
@@ -34,7 +34,7 @@ internal val platformOperations: PlatformOperations by lazy {
                 }
 
                 override fun createRedrawer(
-                    layer: HardwareLayer,
+                    layer: SkiaLayer,
                     renderApi: GraphicsApi,
                     properties: SkiaLayerProperties
                 ) = when(renderApi) {
@@ -62,7 +62,7 @@ internal val platformOperations: PlatformOperations by lazy {
                 }
 
                 override fun createRedrawer(
-                    layer: HardwareLayer,
+                    layer: SkiaLayer,
                     renderApi: GraphicsApi,
                     properties: SkiaLayerProperties
                 ) = when(renderApi) {
@@ -103,7 +103,7 @@ internal val platformOperations: PlatformOperations by lazy {
                 }
 
                 override fun createRedrawer(
-                    layer: HardwareLayer,
+                    layer: SkiaLayer,
                     renderApi: GraphicsApi,
                     properties: SkiaLayerProperties
                 ) = when(renderApi) {

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

@@ -9,6 +9,8 @@ import org.jetbrains.skiko.context.ContextHandler
 import org.jetbrains.skiko.context.createContextHandler
 import org.jetbrains.skiko.redrawer.Redrawer
 import java.awt.Graphics
+import java.awt.event.HierarchyEvent
+import javax.swing.JPanel
 import javax.swing.SwingUtilities.invokeLater
 import javax.swing.SwingUtilities.isEventDispatchThread
 
@@ -20,11 +22,47 @@ private class PictureHolder(val instance: Picture, val width: Int, val height: I
 
 open class SkiaLayer(
     private val properties: SkiaLayerProperties = SkiaLayerProperties()
-) : HardwareLayer() {
+) : JPanel() {
+
+    val backedLayer : HardwareLayer
+
+    init {
+        setOpaque(false)
+        backedLayer = object : HardwareLayer() { }
+        add(backedLayer)
+        @Suppress("LeakingThis")
+        addHierarchyListener {
+            if (it.changeFlags and HierarchyEvent.SHOWING_CHANGED.toLong() != 0L) {
+                checkIsShowing()
+            }
+        }
+    }
+
+    private var isInit = false
+
+    private fun checkIsShowing() {
+        if (!isInit && isShowing) {
+            backedLayer.defineContentScale()
+            init()
+            isInit = true
+        }
+    }
+
+    val contentScale: Float
+        get() = backedLayer.contentScale
+
+    val windowHandle: Long
+        get() = backedLayer.windowHandle
+
+    var fullscreen: Boolean
+        get() = backedLayer.fullscreen
+        set(value) { backedLayer.fullscreen = value }
+
+    protected open fun contentScaleChanged() = Unit
+
     var renderer: SkiaRenderer? = null
     val clipComponents = mutableListOf<ClipRectangle>()
 
-
     @Volatile
     private var isDisposed = false
     internal var redrawer: Redrawer? = null
@@ -36,8 +74,8 @@ open class SkiaLayer(
     private val pictureRecorder = PictureRecorder()
     private val pictureLock = Any()
 
-    override fun init() {
-        super.init()
+    open fun init() {
+        backedLayer.init()
         val initialRenderApi = fallbackRenderApiQueue.removeAt(0)
         contextHandler = createContextHandler(this, initialRenderApi)
         redrawer = platformOperations.createRedrawer(this, initialRenderApi, properties)
@@ -45,7 +83,7 @@ open class SkiaLayer(
         redraw()
     }
 
-    override fun dispose() {
+    open fun dispose() {
         check(!isDisposed)
         check(isEventDispatchThread())
         contextHandler?.dispose()
@@ -53,17 +91,22 @@ open class SkiaLayer(
         picture?.instance?.close()
         pictureRecorder.close()
         isDisposed = true
-        super.dispose()
     }
 
     override fun setBounds(x: Int, y: Int, width: Int, height: Int) {
         super.setBounds(x, y, width, height)
+        if (backedLayer.checkContentScale()) {
+            contentScaleChanged()
+        }
         redrawer?.syncSize()
         redraw()
     }
 
     override fun paint(g: Graphics) {
         super.paint(g)
+        if (backedLayer.checkContentScale()) {
+            contentScaleChanged()
+        }
         redrawer?.syncSize()
         redrawer?.redrawImmediately()
     }
@@ -97,7 +140,7 @@ open class SkiaLayer(
     @Suppress("LeakingThis")
     private val fpsCounter = defaultFPSCounter(this)
 
-    override fun update(nanoTime: Long) {
+    open fun update(nanoTime: Long) {
         check(!isDisposed)
         check(isEventDispatchThread())
 
@@ -126,7 +169,7 @@ open class SkiaLayer(
         }
     }
 
-    override fun draw() {
+    open fun draw() {
         check(!isDisposed)
         contextHandler?.apply {
             if (!initContext()) {

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

@@ -5,11 +5,11 @@ import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skija.BackendRenderTarget
 import org.jetbrains.skija.DirectContext
 import org.jetbrains.skiko.FrameDispatcher
-import org.jetbrains.skiko.HardwareLayer
+import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.SkiaLayerProperties
 
 internal class Direct3DRedrawer(
-    private val layer: HardwareLayer,
+    private val layer: SkiaLayer,
     private val properties: SkiaLayerProperties
 ) : Redrawer {
 

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

@@ -5,23 +5,24 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skiko.DrawingSurface
 import org.jetbrains.skiko.FrameDispatcher
+import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.HardwareLayer
 import org.jetbrains.skiko.OpenGLApi
 import org.jetbrains.skiko.SkiaLayerProperties
 import org.jetbrains.skiko.getDrawingSurface
 
 internal class LinuxOpenGLRedrawer(
-    private val layer: HardwareLayer,
+    private val layer: SkiaLayer,
     private val properties: SkiaLayerProperties
 ) : Redrawer {
-    private val context = layer.lockDrawingSurface {
+    private val context = layer.backedLayer.lockDrawingSurface {
         it.createContext()
     }
     private var isDisposed = false
 
     override fun dispose() {
         check(!isDisposed)
-        layer.lockDrawingSurface {
+        layer.backedLayer.lockDrawingSurface {
             it.destroyContext(context)
         }
         isDisposed = true
@@ -33,7 +34,7 @@ internal class LinuxOpenGLRedrawer(
         frameDispatcher.scheduleFrame()
     }
 
-    override fun redrawImmediately() = layer.lockDrawingSurface {
+    override fun redrawImmediately() = layer.backedLayer.lockDrawingSurface {
         check(!isDisposed)
         update(System.nanoTime())
         it.makeCurrent(context)
@@ -73,7 +74,7 @@ internal class LinuxOpenGLRedrawer(
 
             val isVsyncEnabled = toRedrawAlive.all { it.properties.isVsyncEnabled }
 
-            val drawingSurfaces = toRedrawAlive.map { lockDrawingSurface(it.layer) }.toList()
+            val drawingSurfaces = toRedrawAlive.map { lockDrawingSurface(it.layer.backedLayer) }.toList()
             try {
                 toRedrawAlive.forEachIndexed { index, redrawer ->
                     drawingSurfaces[index].makeCurrent(redrawer.context)

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

@@ -4,7 +4,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skiko.FrameDispatcher
-import org.jetbrains.skiko.HardwareLayer
+import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.OpenGLApi
 import org.jetbrains.skiko.SkiaLayerProperties
 import org.jetbrains.skiko.Task
@@ -21,10 +21,10 @@ import kotlin.system.measureNanoTime
 // P.S. MacOsOpenGLRedrawer will not be used by default in the future, because we will support Metal.
 
 internal class MacOsOpenGLRedrawer(
-    private val layer: HardwareLayer,
+    private val layer: SkiaLayer,
     private val properties: SkiaLayerProperties
 ) : Redrawer {
-    private val containerLayerPtr = layer.useDrawingSurfacePlatformInfo(::initContainer)
+    private val containerLayerPtr = layer.backedLayer.useDrawingSurfacePlatformInfo(::initContainer)
     private val drawLock = Any()
     private var isDisposed = false
 
@@ -106,7 +106,6 @@ internal class MacOsOpenGLRedrawer(
     }
 
     override fun syncSize() {
-        println("syncsize")
         val globalPosition = convertPoint(layer, layer.x, layer.y, getRootPane(layer))
         setContentScale(containerLayerPtr, layer.contentScale)
         setContentScale(drawLayer.ptr, layer.contentScale)

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

@@ -5,18 +5,18 @@ import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skija.BackendRenderTarget
 import org.jetbrains.skija.DirectContext
 import org.jetbrains.skiko.FrameDispatcher
-import org.jetbrains.skiko.HardwareLayer
+import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.SkiaLayerProperties
 import org.jetbrains.skiko.useDrawingSurfacePlatformInfo
 import javax.swing.SwingUtilities.convertPoint
 import javax.swing.SwingUtilities.getRootPane
 
 internal class MetalRedrawer(
-    private val layer: HardwareLayer,
+    private val layer: SkiaLayer,
     private val properties: SkiaLayerProperties
 ) : Redrawer {
     private var isDisposed = false
-    private val device = layer.useDrawingSurfacePlatformInfo(::createMetalDevice)
+    private val device = layer.backedLayer.useDrawingSurfacePlatformInfo(::createMetalDevice)
 
     private val frameDispatcher = FrameDispatcher(Dispatchers.Swing) {
         update(System.nanoTime())

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

@@ -3,10 +3,10 @@ package org.jetbrains.skiko.redrawer
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.swing.Swing
 import org.jetbrains.skiko.FrameDispatcher
-import org.jetbrains.skiko.HardwareLayer
+import org.jetbrains.skiko.SkiaLayer
 
 internal class SoftwareRedrawer(
-    private val layer: HardwareLayer
+    private val layer: SkiaLayer
 ) : Redrawer {
 
     private val frameDispatcher = FrameDispatcher(Dispatchers.Swing) {

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

@@ -5,16 +5,16 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.swing.Swing
 import kotlinx.coroutines.withContext
 import org.jetbrains.skiko.FrameDispatcher
-import org.jetbrains.skiko.HardwareLayer
+import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.OpenGLApi
 import org.jetbrains.skiko.SkiaLayerProperties
 import org.jetbrains.skiko.useDrawingSurfacePlatformInfo
 
 internal class WindowsOpenGLRedrawer(
-    private val layer: HardwareLayer,
+    private val layer: SkiaLayer,
     private val properties: SkiaLayerProperties
 ) : Redrawer {
-    private val device = layer.useDrawingSurfacePlatformInfo(::getDevice)
+    private val device = layer.backedLayer.useDrawingSurfacePlatformInfo(::getDevice)
     private val context = createContext(device)
     private var isDisposed = false