Fix issue #8: ColorType(int,int,int,int) sign-extends on high alpha

java/org/cef/CefSettings.java

@@ -60,7 +60,14 @@ public class ColorType {
         private ColorType() {}
 
         public ColorType(int alpha, int red, int green, int blue) {
-            color_value = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
+            // Pack in long-typed arithmetic and mask to 32 bits -- packing in
+            // int arithmetic first (as this used to) sign-extends into the
+            // long's upper 32 bits whenever alpha >= 0x80 (the sign bit of
+            // the intermediate 32-bit result), instead of the plain unsigned
+            // 32-bit ARGB value this field's own Javadoc describes. See
+            // Thrameos/java-cef#8.
+            color_value = ((long) alpha << 24 | (long) red << 16 | (long) green << 8 | blue)
+                    & 0xFFFFFFFFL;
         }
 
         public long getColor() {

java/tests/junittests/CefSettingsTest.java

@@ -0,0 +1,27 @@
+// Copyright (c) 2026 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+package tests.junittests;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.cef.CefSettings;
+import org.junit.jupiter.api.Test;
+
+// Plain Java value object -- no CEF native lifecycle involved.
+class CefSettingsTest {
+    @Test
+    void colorTypeHighAlphaDoesNotSignExtend() {
+        CefSettings settings = new CefSettings();
+        CefSettings.ColorType color = settings.new ColorType(0xFF, 0x11, 0x22, 0x33);
+        assertEquals(0xFF112233L, color.getColor());
+    }
+
+    @Test
+    void colorTypeLowAlpha() {
+        CefSettings settings = new CefSettings();
+        CefSettings.ColorType color = settings.new ColorType(0x7F, 0x11, 0x22, 0x33);
+        assertEquals(0x7F112233L, color.getColor());
+    }
+}