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 * This code is free software; you can redistribute it and/or modify it

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 * published by the Free Software Foundation.

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 * 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.

 *

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import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.GraphicsConfiguration;

import java.awt.GraphicsEnvironment;

import java.awt.GradientPaint;

import java.awt.geom.Point2D;

import java.awt.Font;

import java.awt.image.BufferedImage;

import java.awt.image.VolatileImage;

/*

 * @test

 * @bug 7189452 8024767

 * @summary Check if source offset for text rendering is handled correctly

 *          (shouldn't see the text on a similarly colored background).

 * @author a.stepanov

 * @run main TextRenderingTest

 */

public class TextRenderingTest {

    private static final int width  = 450;

    private static final int height = 150;

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

        GraphicsEnvironment ge =

            GraphicsEnvironment.getLocalGraphicsEnvironment();

        GraphicsConfiguration gc =

            ge.getDefaultScreenDevice().getDefaultConfiguration();

        VolatileImage vi = gc.createCompatibleVolatileImage(width, height);

        while (true) {

            vi.validate(gc);

            Graphics2D g2d = vi.createGraphics();

            g2d.setColor(Color.white);

            g2d.fillRect(0, 0, width, height);

            g2d.setPaint(new GradientPaint(

                             new Point2D.Float(0, height / 2), Color.white,

                             new Point2D.Float(width, height / 2), Color.black));

            g2d.fillRect(0, 0, width, height);

            String fnt = g2d.getFont().getFamily();

            g2d.setFont(new Font(fnt, Font.PLAIN, 100));

            g2d.drawString("IIIIIIIIII", 100, 100); // draw text with offset

            g2d.dispose();

            if (vi.validate(gc) != VolatileImage.IMAGE_OK) {

                try {

                    Thread.sleep(100);

                } catch (InterruptedException e) {}

                continue;

            }

            if (vi.contentsLost()) {

                try {

                    Thread.sleep(100);

                } catch (InterruptedException e) {}

                continue;

            }

            break;

        }

        BufferedImage bi = vi.getSnapshot();

        // the text shifted shouldn't be visible onto a painted rectangle!

        // so the check: color component (blue) must decrease monotonously

        int prev = Integer.MAX_VALUE;

        for (int x = 0; x < width; ++x) {

            int color = bi.getRGB(x, height / 2);

            int b = color & 0xFF;

            if (b > prev) {

                throw new RuntimeException("test failed: can see the text rendered!");

            }

            prev = b;

        }

    }

}