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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

import java.awt.*;
import javax.swing.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;

/**
 * @test
 * @bug 8040689
 * @summary Tests if antialiasing artifact are shown for font drawn on 
 *          translucent destination
 */

public class TranslucentAAFont {
    final private static int width = 40;
    final private static int height = 40;
    private static JFrame frame;
    private static BufferedImage actualBimg, expectedBI;
 
    public void start() {
        frame = new JFrame();
        frame.setUndecorated(true);
        frame.setBackground(new Color(0, 0, 0, 0));
        frame.setSize(new Dimension(width, height));
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
           
        GraphicsEnvironment ge = GraphicsEnvironment
                .getLocalGraphicsEnvironment();
        GraphicsConfiguration gc = ge.getDefaultScreenDevice()
                                     .getDefaultConfiguration();        

        int w = frame.getWidth();
        int h = frame.getHeight();

        // Actual image
        // Create translucent bimg
        BufferedImage actualBI = gc.createCompatibleImage(w, h, Transparency.TRANSLUCENT);

        // Render translucent red into translucent bimg
        Graphics2D actualg2d = (Graphics2D) actualBI.createGraphics();
        actualg2d.setColor(new Color(255, 0, 0, 50));
        actualg2d.fillRect(0, 0, w, h);

        // Render text on translucent bimg
        actualg2d.setColor(new Color(0,0,0,255));
        actualg2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Font goldfont = frame.getFont().deriveFont(40f);
        actualg2d.setFont(goldfont);
        actualg2d.drawString( " p " , 0, 30);

        // Render translucent bimg into all-white bimg
        actualBimg = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
        Graphics2D bg2d = actualBimg.createGraphics();
        bg2d.setColor(Color.WHITE);
        bg2d.fillRect(0, 0, actualBimg.getWidth(), actualBimg.getHeight());
        bg2d.drawImage(actualBI, 0, 0, null);
                    

        // Comparison Expected image
        // Create opaue bimg
        expectedBI = gc.createCompatibleImage(w, h, Transparency.OPAQUE);

        Graphics2D tempg2d = (Graphics2D) expectedBI.createGraphics();

        // Fill opaque bimg with white
        tempg2d.setColor(Color.WHITE);
        tempg2d.fillRect(0, 0, expectedBI.getWidth(), expectedBI.getHeight());
                   
        // Render translucent red into opaque bimg 
        tempg2d.setColor(new Color(255, 0, 0, 50));
        tempg2d.fillRect(0, 0, expectedBI.getWidth(), expectedBI.getHeight());
                    
        tempg2d.setColor(new Color(0,0,0,255));
        tempg2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Font font = frame.getFont().deriveFont(40f);
        tempg2d.setFont(font);
        tempg2d.drawString( " p " , 0, 30);

 
     
    }

    public static void main(String[] args) throws Exception {
        // Create the GUI on the event-dispatching thread
        SwingUtilities.invokeAndWait(new Runnable() {

            @Override
            public void run() {
                TranslucentAAFont gtw = new TranslucentAAFont();
                gtw.start();
                
            }
        });
        test (expectedBI, actualBimg);
        frame.dispose();
    }

    private static void test(final BufferedImage gold, final BufferedImage bi)
            throws Exception {
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                if (gold.getRGB(x, y) != bi.getRGB(x, y)) {
                    ImageIO.write(gold, "png", new File("expected.png"));
                    ImageIO.write(bi, "png", new File("actual.png"));
                    System.out.println("gold.getRGB(" + x + ", " + y + ") = "
                            + Integer.toHexString(gold.getRGB(x, y)) + " != " +
                            "bi.getRGB("+ x + ", " + y + ") = " 
                            + Integer.toHexString(bi.getRGB(x, y)));
                    throw new RuntimeException("antialiasing artifacts");
                }
            }
        }
    }
}