/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.GraphicsConfiguration;

import java.awt.GraphicsDevice;

import java.awt.GraphicsEnvironment;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

import java.awt.image.DataBuffer;

import java.awt.image.DataBufferByte;

import java.awt.image.DataBufferInt;

import java.awt.image.DataBufferShort;

import java.awt.image.VolatileImage;

import static java.awt.Transparency.TRANSLUCENT;

/**

 * @test

 * @bug 8062164

 * @summary We should get correct alpha, when we draw to/from VolatileImage and

 *          bicubic interpolation is enabled

 * @author Sergey Bylokhov

 */

public final class IncorrectAlphaConversionBicubic {

    private static final Color RGB = new Color(200, 255, 7, 123);

    private static final int SIZE = 100;

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

        final GraphicsEnvironment ge =

                GraphicsEnvironment.getLocalGraphicsEnvironment();

        final GraphicsDevice gd = ge.getDefaultScreenDevice();

        final GraphicsConfiguration gc = gd.getDefaultConfiguration();

        final VolatileImage vi =

                gc.createCompatibleVolatileImage(SIZE, SIZE, TRANSLUCENT);

        final BufferedImage bi = makeUnmanagedBI(gc, TRANSLUCENT);

        final int expected = bi.getRGB(2, 2);

        int attempt = 0;

        BufferedImage snapshot;

        while (true) {

            if (++attempt > 10) {

                throw new RuntimeException("Too many attempts: " + attempt);

            }

            vi.validate(gc);

            final Graphics2D g2d = vi.createGraphics();

            g2d.setComposite(AlphaComposite.Src);

            g2d.scale(2, 2);

            g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,

                                 RenderingHints.VALUE_INTERPOLATION_BICUBIC);

            g2d.drawImage(bi, 0, 0, null);

            g2d.dispose();

            snapshot = vi.getSnapshot();

            if (vi.contentsLost()) {

                continue;

            }

            break;

        }

        final int actual = snapshot.getRGB(2, 2);

        if (actual != expected) {

            System.err.println("Actual: " + Integer.toHexString(actual));

            System.err.println("Expected: " + Integer.toHexString(expected));

            throw new RuntimeException("Test failed");

        }

    }

    private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,

                                                 int type) {

        BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);

        Graphics2D g2d = img.createGraphics();

        g2d.setColor(RGB);

        g2d.fillRect(0, 0, SIZE, SIZE);

        g2d.dispose();

        final DataBuffer db = img.getRaster().getDataBuffer();

        if (db instanceof DataBufferInt) {

            ((DataBufferInt) db).getData();

        } else if (db instanceof DataBufferShort) {

            ((DataBufferShort) db).getData();

        } else if (db instanceof DataBufferByte) {

            ((DataBufferByte) db).getData();

        } else {

            try {

                img.setAccelerationPriority(0.0f);

            } catch (final Throwable ignored) {

            }

        }

        return img;

    }

}