solve issue #2166 (logic error in DepthOfFieldFilter serialization) (#2170)

* solve issue #2166 (logic error in DepthOfFieldFilter serialization)

* test DepthOfFieldFilter serialization

jme3-effects/src/main/java/com/jme3/post/filters/DepthOfFieldFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2021 jMonkeyEngine
+ * Copyright (c) 2009-2023 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -227,7 +227,7 @@ public class DepthOfFieldFilter extends Filter {
         super.write(ex);
         OutputCapsule oc = ex.getCapsule(this);
         oc.write(blurScale, "blurScale", 1f);
-        oc.write(blurScale, "blurThreshold", 0.2f);
+        oc.write(blurThreshold, "blurThreshold", 0.2f);
         oc.write(focusDistance, "focusDistance", 50f);
         oc.write(focusRange, "focusRange", 10f);
         oc.write(debugUnfocus, "debugUnfocus", false); // strange to write this I guess

jme3-effects/src/test/java/com/jme3/post/filters/DepthOfFieldFilterTest.java

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2023 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.post.filters;
+
+import com.jme3.asset.AssetManager;
+import com.jme3.asset.DesktopAssetManager;
+import com.jme3.export.binary.BinaryExporter;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Automated tests for the {@code DepthOfFieldFilter} class.
+ *
+ * @author sgold
+ */
+public class DepthOfFieldFilterTest {
+    /**
+     * Tests serialization and de-serialization of a {@code DepthOfFieldFilter}.
+     * This test would've detected JME issue #2166, for instance.
+     */
+    @Test
+    public void testSaveAndLoad() {
+        DepthOfFieldFilter filter = new DepthOfFieldFilter();
+
+        // Verify the default parameter values:
+        verifyDefaults(filter);
+
+        // Set parameters to new values:
+        filter.setBlurScale(10.5f);
+        filter.setBlurThreshold(0.1f);
+        filter.setDebugUnfocus(true);
+        filter.setEnabled(false);
+        filter.setFocusDistance(66f);
+        filter.setFocusRange(15f);
+
+        // Create a duplicate filter using serialization:
+        AssetManager assetManager = new DesktopAssetManager();
+        DepthOfFieldFilter copy = BinaryExporter.saveAndLoad(assetManager, filter);
+
+        // Verify the parameter values of the copy:
+        Assert.assertEquals(10.5f, copy.getBlurScale(), 0f);
+        Assert.assertEquals(0.1f, copy.getBlurThreshold(), 0f);
+        Assert.assertTrue(copy.getDebugUnfocus());
+        Assert.assertEquals(66f, copy.getFocusDistance(), 0f);
+        Assert.assertEquals(15f, copy.getFocusRange(), 0f);
+        Assert.assertEquals("Depth Of Field", copy.getName());
+        Assert.assertFalse(copy.isEnabled());
+    }
+
+    /**
+     * Verify some default values of a newly instantiated
+     * {@code DepthOfFieldFilter}.
+     *
+     * @param filter (not null, unaffected)
+     */
+    private void verifyDefaults(DepthOfFieldFilter filter) {
+        Assert.assertEquals(1f, filter.getBlurScale(), 0f);
+        Assert.assertEquals(0.2f, filter.getBlurThreshold(), 0f);
+        Assert.assertFalse(filter.getDebugUnfocus());
+        Assert.assertEquals(50f, filter.getFocusDistance(), 0f);
+        Assert.assertEquals(10f, filter.getFocusRange(), 0f);
+        Assert.assertEquals("Depth Of Field", filter.getName());
+        Assert.assertTrue(filter.isEnabled());
+    }
+}