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 * This code is distributed in the hope that it will be useful, but WITHOUT

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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 * 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.AlphaComposite;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.GraphicsConfiguration;

import java.awt.GraphicsEnvironment;

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.awt.image.VolatileImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import static java.awt.Transparency.TRANSLUCENT;

import static java.awt.image.BufferedImage.TYPE_4BYTE_ABGR;

import static java.awt.image.BufferedImage.TYPE_4BYTE_ABGR_PRE;

import static java.awt.image.BufferedImage.TYPE_INT_ARGB;

import static java.awt.image.BufferedImage.TYPE_INT_ARGB_PRE;

/**

 * @test

 * @bug 8017626

 * @summary Tests drawing transparent volatile image to transparent BI.

 *          Results of the blit compatibleImage to transparent BI used for

 *          comparison.

 * @author Sergey Bylokhov

 */

public final class IncorrectAlphaSurface2SW {

    private static final int[] SCALES = {1, 2, 4, 8};

    private static final int[] SIZES = {1, 2, 3, 127, 128, 254, 255, 256};

    private static final int[] dstTypes = {TYPE_INT_ARGB, TYPE_INT_ARGB_PRE,

            TYPE_4BYTE_ABGR, TYPE_4BYTE_ABGR_PRE};

    private static final int[] srcTypes = {TRANSLUCENT};

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

        GraphicsEnvironment ge = GraphicsEnvironment

                .getLocalGraphicsEnvironment();

        GraphicsConfiguration gc = ge.getDefaultScreenDevice()

                                     .getDefaultConfiguration();

        BufferedImage destVI;

        BufferedImage destBI;

        BufferedImage sourceBI;

        VolatileImage sourceVI;

        for (final int s : SIZES) {

            for (final int srcType : srcTypes) {

                for (final int dstType : dstTypes) {

                    for (final int scale : SCALES) {

                        int sw = s * scale;

                        destVI = new BufferedImage(sw, sw, dstType);

                        destBI = new BufferedImage(sw, sw, dstType);

                        sourceBI = gc.createCompatibleImage(sw, sw, srcType);

                        sourceVI = gc.createCompatibleVolatileImage(s, s, srcType);

                        // draw to dest BI using compatible image

                        fill(sourceBI, s);

                        Graphics2D big = destBI.createGraphics();

                        big.setComposite(AlphaComposite.Src);

                        big.drawImage(sourceBI, 0, 0, sw, sw, null);

                        big.dispose();

                        // draw to dest BI using compatible image

                        fill(sourceVI, s);

                        drawVItoBI(gc, destVI, sourceVI);

                        validate(destVI, destBI);

                        sourceVI.flush();

                    }

                }

            }

        }

        System.out.println("Test PASSED");

    }

    private static void drawVItoBI(GraphicsConfiguration gc,

                                   BufferedImage bi, VolatileImage vi) {

        while (true) {

            vi.validate(gc);

            fill(vi, vi.getHeight());

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

                try {

                    Thread.sleep(100);

                } catch (final InterruptedException ignored) {

                }

                continue;

            }

            Graphics2D big = bi.createGraphics();

            big.setComposite(AlphaComposite.Src);

            big.drawImage(vi, 0, 0, bi.getWidth(), bi.getHeight(), null);

            big.dispose();

            if (vi.contentsLost()) {

                try {

                    Thread.sleep(100);

                } catch (final InterruptedException ignored) {

                }

                continue;

            }

            break;

        }

    }

    private static void validate(BufferedImage bi, BufferedImage gold)

            throws IOException {

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

            for (int y = 0; y < bi.getHeight(); ++y) {

                if (gold.getRGB(x, y) != bi.getRGB(x, y)) {

                    System.err.println("Expected color = " + gold.getRGB(x, y));

                    System.err.println("Actual color = " + bi.getRGB(x, y));

                    ImageIO.write(gold, "png", new File("gold.png"));

                    ImageIO.write(bi, "png", new File("bi.png"));

                    throw new RuntimeException("Test failed.");

                }

            }

        }

    }

    /**

     * Fills the whole image using different alpha for each row.

     *

     * @param image to fill

     */

    private static void fill(final Image image, final int size) {

        Graphics2D graphics = (Graphics2D) image.getGraphics();

        graphics.setComposite(AlphaComposite.Src);

        graphics.setColor(Color.GREEN);

        graphics.fillRect(0, 0, image.getWidth(null), image.getHeight(null));

        int row = image.getHeight(null) / size;

        for (int i = 0; i < size; ++i) {

            graphics.setColor(new Color(23, 127, 189, i));

            graphics.fillRect(0, i * row, image.getWidth(null), row);

        }

        graphics.dispose();

    }

}