/*

 * Copyright (c) 2019, 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.BasicStroke;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import java.awt.RenderingHints;

import java.awt.geom.AffineTransform;

import java.awt.geom.Ellipse2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

/**

 * Tests calculating user space line with a negative determinant (flip).

 *

 * @test

 * @summary verify that flipped transformed lines are properly rasterized

 * @bug 8230728

 */

public class FlipBitTest {

    static final boolean SAVE_IMAGE = false;

    public static void main(final String[] args) {

        final int size = 100;

        // First display which renderer is tested:

        // JDK9 only:

        System.setProperty("sun.java2d.renderer.verbose", "true");

        System.out.println("FlipBitTest: size = " + size);

        final BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);

        final Graphics2D g2d = (Graphics2D) image.getGraphics();

        try {

            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

            g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

            g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_NORMALIZE);

            final AffineTransform at = new AffineTransform();

            at.setToScale(1, -1.01);

            g2d.setTransform(at);

            g2d.translate(0, -image.getHeight());

            g2d.setPaint(Color.WHITE);

            g2d.fill(new Rectangle(image.getWidth(), image.getHeight()));

            g2d.setPaint(Color.BLACK);

            g2d.setStroke(new BasicStroke(0.1f));

            g2d.draw(new Ellipse2D.Double(25, 25, 50, 50));

            if (SAVE_IMAGE) {

                try {

                    final File file = new File("FlipBitTest.png");

                    System.out.println("Writing file: " + file.getAbsolutePath());

                    ImageIO.write(image, "PNG", file);

                } catch (IOException ex) {

                    ex.printStackTrace();

                }

            }

            boolean nonWhitePixelFound = false;

            for (int x = 0; x < image.getWidth(); ++x) {

                if (image.getRGB(x, 50) != Color.WHITE.getRGB()) {

                    nonWhitePixelFound = true;

                    break;

                }

            }

            if (!nonWhitePixelFound) {

                throw new IllegalStateException("The ellipse was not drawn");

            }

        } finally {

            g2d.dispose();

        }

    }

}