8059943: [macosx] Aqua LaF should use BI.TYPE_INT_ARGB_PRE for a better performance

Reviewed-by: alexsch, azvegint

src/macosx/classes/com/apple/laf/AquaIcon.java

@@ -62,7 +62,7 @@ public class AquaIcon {
         if (w <= 0 || h <= 0) return null;
 
         // This could be any kind of icon, so we need to make a buffer for it, draw it and then pass the new image off to appkit.
-        final BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
+        final BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB_PRE);
         final Graphics g = image.getGraphics();
         i.paintIcon(null, g, 0, 0);
         g.dispose();

src/macosx/classes/com/apple/laf/AquaImageFactory.java

@@ -129,7 +129,7 @@ public class AquaImageFactory {
                 };
 
         final BufferedImage image = new BufferedImage(scaledAlertIconSize,
-                scaledAlertIconSize, BufferedImage.TYPE_INT_ARGB);
+                scaledAlertIconSize, BufferedImage.TYPE_INT_ARGB_PRE);
         final Graphics g = image.getGraphics();
         g.drawImage(background, 0, 0,
                 scaledAlertIconSize, scaledAlertIconSize, null);

src/macosx/classes/com/apple/laf/AquaNativeResources.java

@@ -66,11 +66,12 @@ public class AquaNativeResources {
     }
 
     static BufferedImage getRadioButtonSizerImage() {
-        final BufferedImage img = new BufferedImage(20, 20, BufferedImage.TYPE_INT_ARGB);
+        final BufferedImage img = new BufferedImage(20, 20, BufferedImage.TYPE_INT_ARGB_PRE);
 
         Graphics g = img.getGraphics();
         g.setColor(Color.pink);
         g.fillRect(0, 0, 20, 20);
+        g.dispose();
 
         return img;
     }