/*

 * Copyright (c) 2015, 2017, 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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 * questions.

 */

/**

 * @test

 * @key headful

 * @bug 8064833

 * @summary Test correct font is obtained via famil+style

 * @run main HelvLtOblTest

 */

import javax.swing.JComponent;

import javax.swing.JFrame;

import javax.swing.SwingUtilities;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.GraphicsEnvironment;

import java.awt.RenderingHints;

import java.awt.font.FontRenderContext;

import java.awt.font.GlyphVector;

import java.awt.image.BufferedImage;

public class HelvLtOblTest extends JComponent {

    static Font helvFont = null;

    static int[] codes = { 0x23, 0x4a, 0x48, 0x3, 0x4a, 0x55, 0x42, 0x4d,

                    0x4a, 0x44, 0x3,

                    0x53, 0x46, 0x45, 0x3, 0x55, 0x46, 0x59, 0x55, };

    static String str = "Big italic red text";

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

        String os = System.getProperty("os.name");

        if (!os.startsWith("Mac")) {

             return;

        }

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();

        Font[] fonts = ge.getAllFonts();

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

            if (fonts[i].getPSName().equals("Helvetica-LightOblique")) {

                 helvFont = fonts[i];

                 break;

            }

        }

        if (helvFont == null) {

            return;

        }

        final HelvLtOblTest test = new HelvLtOblTest();

        SwingUtilities.invokeLater(() -> {

            JFrame f = new JFrame();

            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            f.add("Center", test);

            f.pack();

            f.setVisible(true);

        });

        test.compareImages();

    }

    public Dimension getPreferredSize() {

      return new Dimension(400,400);

    }

    public void paintComponent(Graphics g) {

         super.paintComponent(g);

         Graphics2D g2 = (Graphics2D)g;

         FontRenderContext frc = new FontRenderContext(null, true, true);

         Font f = helvFont.deriveFont(Font.PLAIN, 40);

         System.out.println("font = " +f.getFontName());

         GlyphVector gv = f.createGlyphVector(frc, codes);

         g.setFont(f);

         g.setColor(Color.white);

         g.fillRect(0,0,400,400);

         g.setColor(Color.black);

         g2.drawGlyphVector(gv, 5,200);

         g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,

                             RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

         g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,

                             RenderingHints.VALUE_FRACTIONALMETRICS_ON);

         g2.drawString(str, 5, 250);

    }

    void compareImages() {

         BufferedImage bi0 = drawText(false);

         BufferedImage bi1 = drawText(true);

         compare(bi0, bi1);

    }

    BufferedImage drawText(boolean doGV) {

        int w = 400;

        int h = 50;

        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

        Graphics2D g = bi.createGraphics();

        g.setColor(Color.white);

        g.fillRect(0,0,w,h);

        g.setColor(Color.black);

        Font f = helvFont.deriveFont(Font.PLAIN, 40);

        g.setFont(f);

        int x = 5;

        int y = h - 10;

        if (doGV) {

            FontRenderContext frc = new FontRenderContext(null, true, true);

            GlyphVector gv = f.createGlyphVector(frc, codes);

            g.drawGlyphVector(gv, 5, y);

       } else {

           g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,

                              RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

           g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,

                              RenderingHints.VALUE_FRACTIONALMETRICS_ON);

           g.drawString(str, x, y);

       }

       return bi;

    }

    // Need to allow for minimal rounding error, so allow each component

    // to differ by 1.

    void compare(BufferedImage bi0, BufferedImage bi1) {

        int wid = bi0.getWidth();

        int hgt = bi0.getHeight();

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

            for (int y=0; y<hgt; y++) {

                int rgb0 = bi0.getRGB(x, y);

                int rgb1 = bi1.getRGB(x, y);

                if (rgb0 == rgb1) continue;

                int r0 = (rgb0 & 0xff0000) >> 16;

                int r1 = (rgb1 & 0xff0000) >> 16;

                int rdiff = r0-r1; if (rdiff<0) rdiff = -rdiff;

                int g0 = (rgb0 & 0x00ff00) >> 8;

                int g1 = (rgb1 & 0x00ff00) >> 8;

                int gdiff = g0-g1; if (gdiff<0) gdiff = -gdiff;

                int b0 = (rgb0 & 0x0000ff);

                int b1 = (rgb1 & 0x0000ff);

                int bdiff = b0-b1; if (bdiff<0) bdiff = -bdiff;

                if (rdiff > 1 || gdiff > 1 || bdiff > 1) {

                    throw new RuntimeException(

                      "Images differ at x=" + x + " y="+ y + " " +

                      Integer.toHexString(rgb0) + " vs " +

                      Integer.toHexString(rgb1));

                }

            }

        }

    }

}