Fix cases where OpenGL init fails later (#129)

skiko/src/jvmMain/cpp/linux/redrawer.cc

@@ -80,9 +80,13 @@ extern "C"
     JNIEXPORT jlong JNICALL Java_org_jetbrains_skiko_redrawer_LinuxOpenGLRedrawerKt_createContext(JNIEnv *env, jobject redrawer, jlong displayPtr)
     {
         Display *display = fromJavaPointer<Display *>(displayPtr);
+        if (!display) return 0;
+
         GLint att[] = {GLX_RGBA, GLX_DOUBLEBUFFER, True, None};
         XVisualInfo *vi = glXChooseVisual(display, 0, att);
 
+        if (!vi) return 0;
+
         GLXContext *context = new GLXContext(glXCreateContext(display, vi, NULL, GL_TRUE));
         return toJavaPointer(context);
     }
@@ -92,7 +96,9 @@ extern "C"
         Display *display = fromJavaPointer<Display *>(displayPtr);
         GLXContext *context = fromJavaPointer<GLXContext *>(contextPtr);
 
+        if (display && context) {
             glXDestroyContext(display, *context);
             delete context;
 	}
+    }
 }

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

@@ -112,11 +112,27 @@ open class SkiaLayer(
     private val pictureRecorder = PictureRecorder()
     private val pictureLock = Any()
 
-    open fun init() {
-        backedLayer.init()
+    private fun findNextWorkingRenderApi(redraw: Boolean) {
+        var thrown: Boolean
+        do {
+            thrown = false
+            try {
 	        renderApi = fallbackRenderApiQueue.removeAt(0)
+                println("Trying $renderApi rendering...")
+                contextHandler?.dispose()
+                redrawer?.dispose()
                 contextHandler = createContextHandler(this, renderApi)
                 redrawer = platformOperations.createRedrawer(this, renderApi, properties)
+                if (redraw) redrawer!!.redrawImmediately()
+            } catch (e: IllegalArgumentException) {
+                 thrown = true
+            }
+        } while (thrown)
+    }
+
+    open fun init() {
+        backedLayer.init()
+        findNextWorkingRenderApi(false)
         onInit.complete(Unit)
     }
 
@@ -270,7 +286,7 @@ open class SkiaLayer(
         return withContext(Dispatchers.Swing) {
             check(!isDisposed)
             onInit.await()
-            redrawer!!.awaitRedraw()
+            redrawer?.awaitRedraw() != false
         }
     }
 
@@ -315,7 +331,7 @@ open class SkiaLayer(
         check(!isDisposed)
         contextHandler?.apply {
             if (!initContext()) {
-                fallbackToNextApi()
+                findNextWorkingRenderApi(true)
                 return false
             }
             initCanvas()
@@ -373,16 +389,6 @@ open class SkiaLayer(
         )
     }
 
-    private fun fallbackToNextApi() {
-        renderApi = fallbackRenderApiQueue.removeAt(0)
-        println("Falling back to $renderApi rendering...")
-        contextHandler?.dispose()
-        redrawer?.dispose()
-        contextHandler = createContextHandler(this, renderApi)
-        redrawer = platformOperations.createRedrawer(this, renderApi, properties)
-        redrawer!!.redrawImmediately()
-    }
-
     private fun roundSize(value: Int): Int {
         var rounded = value * contentScale
         val diff = rounded - rounded.toInt()

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

@@ -16,7 +16,7 @@ internal class LinuxOpenGLRedrawer(
     private val properties: SkiaLayerProperties
 ) : Redrawer {
     private val context = layer.backedLayer.lockDrawingSurface {
-        it.createContext()
+        it.createContext().also { if (it == 0L) throw IllegalArgumentException("Cannot create Linux GL context") }
     }
     private var isDisposed = false