Loader and initializer tweaks. (#39)

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

@@ -5,7 +5,6 @@ import java.io.InputStreamReader
 import java.io.File
 import java.nio.file.Files
 import java.nio.file.StandardCopyOption
-import javax.swing.UIManager
 
 object Library {
     private var loaded = false
@@ -38,7 +37,11 @@ object Library {
         val name = "skiko-$hostId"
         val platformName = System.mapLibraryName(name)
 
-        val hash = Library::class.java.getResourceAsStream("$resourcePath$platformName.sha256").use {
+        val hashResourceStream = Library::class.java.getResourceAsStream(
+            "$resourcePath$platformName.sha256") ?: throw LibraryLoadException(
+            "Cannot find $platformName.sha256, proper native dependency missing."
+        )
+        val hash = hashResourceStream.use {
             BufferedReader(InputStreamReader(it)).lines().toArray()[0] as String
         }
         val cacheDir = File("$cacheRoot/$hash")
@@ -49,7 +52,10 @@ object Library {
             loadOrGet(cacheDir, resourcePath, "icudtl.dat", false)
         }
 
-        miscSystemInit()
+        Setup.init(
+            System.getProperty("skiko.rendering.laf.global") == "true",
+            System.getProperty("skiko.rendering.noerasebackground") != "false"
+        )
 
         try {
             // Init code executed after library was loaded.
@@ -60,18 +66,5 @@ object Library {
         loaded = true
     }
 
-    // This function doesn't actually belong to this file.
-    private fun miscSystemInit() {
-        // we have to set this property to avoid render flickering.
-        System.setProperty("sun.awt.noerasebackground", "true")
-        System.setProperty("skija.staticLoad", "false")
 
-        // setup menu look and feel
-        try {
-            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
-            System.setProperty("apple.laf.useScreenMenuBar", "true")
-        } catch (e: UnsupportedOperationException) {
-            // Not all platforms allow this.
-        }
-    }
 }

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

+package org.jetbrains.skiko
+
+import java.lang.RuntimeException
+
+class LibraryLoadException(message: String) : RuntimeException(message)
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skiko/src/jvmMain/kotlin/org/jetbrains/skiko/Setup.kt

+package org.jetbrains.skiko
+
+import javax.swing.UIManager
+
+object Setup {
+    fun init(globalLAF: Boolean = false, noEraseBackground: Boolean = true) {
+        if (noEraseBackground) {
+            // we have to set this property to avoid render flickering.
+            System.setProperty("sun.awt.noerasebackground", "true")
+        }
+        try {
+            if (globalLAF) {
+                // Setup menu look and feel.
+                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
+                System.setProperty("apple.laf.useScreenMenuBar", "true")
+            }
+        } catch (e: UnsupportedOperationException) {
+            // Not all platforms allow this.
+        }
+    }
+}
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