/*

 * Copyright (c) 2014, 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

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

 * questions.

 */

/**

 * @test

 * @bug     8041465

 * @summary Test verifies that standard ImageIO plugins handle

 *          multiple reads correctly.

 *

 * @run     main MultiReadTest

 */

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.imageio.ImageReadParam;

import javax.imageio.ImageReader;

import javax.imageio.stream.ImageInputStream;

public class MultiReadTest {

    private static final File pwd = new File(".");

    private static final Color srcColor = Color.red;

    private static final int width = 200;

    private static final int height = 200;

    private static final int max = 5;

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

        final String[] formats = { "bmp", "png", "gif", "jpg" };

        for (String f : formats) {

            test(f);

        }

    }

    private static void test(String format) throws IOException {

        System.out.println("Format: " + format);

        BufferedImage src = createSrc();

        ImageInputStream iis = prepareInput(src, format);

        ImageReader reader = ImageIO.getImageReaders(iis).next();

        reader.setInput(iis);

        ImageReadParam p = reader.getDefaultReadParam();

        int cnt = 0;

        do {

            System.out.println("cnt: " + cnt);

            p.setSourceRegion(new Rectangle(width / 4, height / 4,

                                            width / 2, height / 2));

            BufferedImage dst = reader.read(0, p);

            final Color c = new Color(dst.getRGB(10, 10), true);

            if (!sameColor(c, srcColor)) {

                throw new RuntimeException(

                    String.format("Test failed: read color 0x%X\n",

                                  c.getRGB()));

            }

        } while (++cnt < max);

    }

    private static boolean sameColor(Color c1, Color c2) {

        final float delta = 0.1f;

        float[] rgb1 = new float[4];

        float[] rgb2 = new float[4];

        rgb1 = c1.getRGBComponents(rgb1);

        rgb2 = c2.getRGBComponents(rgb2);

        for (int i = 0; i < rgb1.length; i++) {

            if (Math.abs(rgb1[i] - rgb2[i]) > delta) {

                return false;

            }

        }

        return true;

    }

    private static BufferedImage createSrc() {

        BufferedImage img = new BufferedImage(width, height,

                BufferedImage.TYPE_INT_RGB);

        Graphics2D g = img.createGraphics();

        g.setColor(srcColor);

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

        g.dispose();

        return img;

    }

    private static ImageInputStream prepareInput(BufferedImage src, String format) throws IOException {

        File f = File.createTempFile("src_", "." + format, pwd);

        if (ImageIO.write(src, format, f)) {

            return ImageIO.createImageInputStream(f);

        }

        return null;

    }

}