/*

 * 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.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 static java.awt.Transparency.BITMASK;

/**

 * @test

 * @bug 7188942

 * @summary We should get correct volatile image, when we use BITMASK

 *          transparency

 */

public final class BitmaskVolatileImage {

    public static final int S = 8;

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

        GraphicsConfiguration gc =

                GraphicsEnvironment.getLocalGraphicsEnvironment()

                        .getDefaultScreenDevice().getDefaultConfiguration();

        VolatileImage vi = gc.createCompatibleVolatileImage(S, S, BITMASK);

        BufferedImage ci = gc.createCompatibleImage(S, S, BITMASK);

        int attempt = 0;

        do {

            if (++attempt > 10) {

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

            }

            vi.validate(gc);

            test(vi, ci, gc);

        } while (vi.contentsLost());

    }

    private static void test(VolatileImage vi, BufferedImage ci, GraphicsConfiguration gc) {

        for (int r = 0; r <= 255; ++r) {

            for (int a = 0; a <= 255; ++a) {

                fill(vi, new Color(r, 0, 0, a));

                fill(ci, new Color(r, 0, 0, a));

                validate(ci, vi.getSnapshot());

            }

        }

    }

    private static void fill(Image image, Color color) {

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

        g2d.setColor(color);

        g2d.setComposite(AlphaComposite.Src);

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

        g2d.dispose();

    }

    private static void validate(BufferedImage ci, BufferedImage snapshot) {

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

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

                int ci_rgb = ci.getRGB(x, y);

                int vi_rgb = snapshot.getRGB(x, y);

                if (ci_rgb != vi_rgb) {

                    System.err.println("Exp:" + Integer.toHexString(ci_rgb));

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

                    throw new RuntimeException("Colors mismatch!");

                }

            }

        }

    }

}