Fixed memory leak when closing window with DirectX rendering.

skiko/src/jvmMain/cpp/common/render.cc

 #include <jni.h>
+#include "jni_helpers.h"
 #include "GrBackendSurface.h"
 #include "GrDirectContext.h"
 
@@ -19,6 +20,12 @@ JNIEXPORT jlong JNICALL Java_org_jetbrains_skiko_RenderTargetsKt_makeGLContextNa
     return reinterpret_cast<jlong>(GrDirectContext::MakeGL().release());
 }
 
+JNIEXPORT void JNICALL Java_org_jetbrains_skiko_RenderTargetsKt_destroyContext(JNIEnv *env, jobject object, jlong contextPtr)
+{
+    GrDirectContext *context = fromJavaPointer<GrDirectContext*>(contextPtr);
+    delete context;
+}
+
 extern void getMetalDeviceAndQueue(void** device, void** queue);
 
 JNIEXPORT jlong JNICALL Java_org_jetbrains_skiko_RenderTargetsKt_makeMetalRenderTargetNative(

skiko/src/jvmMain/cpp/windows/directXRedrawer.cc

@@ -64,6 +64,10 @@ public:
         {
             CloseHandle(fenceEvent);
         }
+        fence.reset(nullptr);
+        swapChain.reset(nullptr);
+        queue.reset(nullptr);
+        device.reset(nullptr);
     }
 };
 
@@ -289,6 +293,7 @@ HRESULT D3DCompile(
         {
             return 0;
         }
+        deviceFactory.reset(nullptr);
 
         // Create the command queue
         gr_cp<ID3D12CommandQueue> queue;
@@ -333,6 +338,8 @@ HRESULT D3DCompile(
         GR_D3D_CALL_ERRCHECK(d3dDevice->device->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&d3dDevice->fence)));
         d3dDevice->fenceEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr);
 
+        swapChainFactory.reset(nullptr);
+
         return toJavaPointer(d3dDevice);
     }
 

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

@@ -24,3 +24,5 @@ external private fun makeGLContextNative(): Long
 
 external private fun makeMetalRenderTargetNative(width: Int, height: Int, sampleCnt: Int): Long
 external private fun makeMetalContextNative(): Long
+
+external internal fun destroyContext(context: Long)

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

@@ -99,6 +99,7 @@ open class SkiaLayer(
         if (isInited) {
             redrawer?.dispose()  // we should dispose redrawer first (to cancel `draw` in rendering thread)
             contextHandler?.dispose()
+            contextHandler?.destroyContext()
             picture?.instance?.close()
             pictureRecorder.close()
             backedLayer.dispose()

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/context/ContextHandler.kt

@@ -30,7 +30,6 @@ internal abstract class ContextHandler(val layer: SkiaLayer) {
     var canvas: Canvas? = null
 
     abstract fun initContext(): Boolean
-
     abstract fun initCanvas()
 
     fun clearCanvas() {
@@ -49,4 +48,6 @@ internal abstract class ContextHandler(val layer: SkiaLayer) {
         surface?.close()
         renderTarget?.close()
     }
+
+    open fun destroyContext() = Unit
 }

skiko/src/jvmMain/kotlin/org/jetbrains/skiko/context/Direct3DContextHandler.kt

@@ -11,6 +11,7 @@ import org.jetbrains.skija.impl.Native
 import org.jetbrains.skiko.SkiaLayer
 import org.jetbrains.skiko.redrawer.Direct3DRedrawer
 import org.jetbrains.skiko.redrawer.Redrawer
+import org.jetbrains.skiko.destroyContext
 
 internal class Direct3DContextHandler(layer: SkiaLayer) : ContextHandler(layer) {
     val directXRedrawer: Direct3DRedrawer
@@ -66,4 +67,8 @@ internal class Direct3DContextHandler(layer: SkiaLayer) : ContextHandler(layer)
             Reference.reachabilityFence(surface!!)
         }
     }
+
+    override fun destroyContext() {
+        destroyContext(Native.getPtr(context!!))
+    }
 }