JetBrainsRuntime/test/jdk/java/awt/font/Emoji/EmojiVariation.java

/*
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 * 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.
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/*
 * @test
 * @key headful
 * @bug 8269806
 * @summary Checks that variation selectors work.
 * @run main/othervm -Dsun.font.layout.ffm=true EmojiVariation
 * @run main/othervm -Dsun.font.layout.ffm=false EmojiVariation
 */

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static java.awt.RenderingHints.KEY_TEXT_ANTIALIASING;
import static java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_OFF;

public class EmojiVariation {
    private static final int IMG_WIDTH = 100;
    private static final int IMG_HEIGHT = 50;

    private static final Color SYMBOL_COLOR = Color.MAGENTA;

    // These emoji must be monochrome by default
    private static final String[] SYMBOLS = {
            "\u00a9","\u00ae","\u203c","\u2049","\u2122","\u2139","\u2194","\u2195","\u2196","\u2197","\u2198","\u2199",
            "\u21a9","\u21aa","\u2328","\u23cf","\u23ed","\u23ee","\u23ef","\u23f1","\u23f2","\u23f8","\u23f9","\u23fa",
            "\u24c2","\u25aa","\u25ab","\u25b6","\u25c0","\u25fb","\u25fc","\u2600","\u2601","\u2602","\u2603","\u2604",
            "\u260e","\u2611","\u2618","\u261d","\u2620","\u2622","\u2623","\u2626","\u262a","\u262e","\u262f","\u2638",
            "\u2639","\u263a","\u2640","\u2642","\u265f","\u2660","\u2663","\u2665","\u2666","\u2668","\u267b","\u267e",
            "\u2692","\u2694","\u2695","\u2696","\u2697","\u2699","\u269b","\u269c","\u26a0","\u26b0","\u26b1","\u26c8",
            "\u26cf","\u26d1","\u26d3","\u26e9","\u26f0","\u26f1","\u26f4","\u26f7","\u26f8","\u26f9","\u2702","\u2708",
            "\u2709","\u270c","\u270d","\u270f","\u2712","\u2714","\u2716","\u271d","\u2721","\u2733","\u2734","\u2744",
            "\u2747","\u2763","\u2764","\u27a1","\u2934","\u2935","\u2b05","\u2b06","\u2b07","\u3030","\u303d","\u3297",
            "\u3299","\ud83c\udd70","\ud83c\udd71","\ud83c\udd7e","\ud83c\udd7f","\ud83c\ude02","\ud83c\ude37",
            "\ud83c\udf21","\ud83c\udf24","\ud83c\udf25","\ud83c\udf26","\ud83c\udf27","\ud83c\udf28","\ud83c\udf29",
            "\ud83c\udf2a","\ud83c\udf2b","\ud83c\udf2c","\ud83c\udf36","\ud83c\udf7d","\ud83c\udf96","\ud83c\udf97",
            "\ud83c\udf99","\ud83c\udf9a","\ud83c\udf9b","\ud83c\udf9e","\ud83c\udf9f","\ud83c\udfcb","\ud83c\udfcc",
            "\ud83c\udfcd","\ud83c\udfce","\ud83c\udfd4","\ud83c\udfd5","\ud83c\udfd6","\ud83c\udfd7","\ud83c\udfd8",
            "\ud83c\udfd9","\ud83c\udfda","\ud83c\udfdb","\ud83c\udfdc","\ud83c\udfdd","\ud83c\udfde","\ud83c\udfdf",
            "\ud83c\udff3","\ud83c\udff5","\ud83c\udff7","\ud83d\udc3f","\ud83d\udc41","\ud83d\udcfd","\ud83d\udd49",
            "\ud83d\udd4a","\ud83d\udd6f","\ud83d\udd70","\ud83d\udd73","\ud83d\udd74","\ud83d\udd75","\ud83d\udd76",
            "\ud83d\udd77","\ud83d\udd78","\ud83d\udd79","\ud83d\udd87","\ud83d\udd8a","\ud83d\udd8b","\ud83d\udd8c",
            "\ud83d\udd8d","\ud83d\udd90","\ud83d\udda5","\ud83d\udda8","\ud83d\uddb1","\ud83d\uddb2","\ud83d\uddbc",
            "\ud83d\uddc2","\ud83d\uddc3","\ud83d\uddc4","\ud83d\uddd1","\ud83d\uddd2","\ud83d\uddd3","\ud83d\udddc",
            "\ud83d\udddd","\ud83d\uddde","\ud83d\udde1","\ud83d\udde3","\ud83d\udde8","\ud83d\uddef","\ud83d\uddf3",
            "\ud83d\uddfa","\ud83d\udecb","\ud83d\udecd","\ud83d\udece","\ud83d\udecf","\ud83d\udee0","\ud83d\udee1",
            "\ud83d\udee2","\ud83d\udee3","\ud83d\udee4","\ud83d\udee5","\ud83d\udee9","\ud83d\udef0","\ud83d\udef3",
    };

    private enum Variation {
        DEFAULT(false, ""),
        MONO(false, "\ufe0e"),
        COLOR(true, "\ufe0f");

        final boolean colorByDefault;
        final String suffix;

        Variation(boolean colorByDefault, String suffix) {
            this.colorByDefault = colorByDefault;
            this.suffix = suffix;
        }
    }

    public static void main(String[] args) {
        requireFont("Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji");
        requireFont("Zapf Dingbats", "Segoe UI Symbol", "DejaVu Sans");

        // Platform-specific tricks
       if (System.getProperty("os.name").toLowerCase().contains("linux")) {
           // Many emoji on Linux don't have monochrome variants
           Arrays.fill(SYMBOLS, 16, 25, null);
           Arrays.fill(SYMBOLS, 71, 82, null);
           Arrays.fill(SYMBOLS, 105, SYMBOLS.length, null);
        } else if (System.getProperty("os.name").toLowerCase().contains("mac")) {
           // Many emoji on macOS don't have monochrome variants
           Arrays.fill(SYMBOLS, 16, 24, null);
           Arrays.fill(SYMBOLS, 69, 82, null);
           Arrays.fill(SYMBOLS, 115, SYMBOLS.length, null);
        }

        BufferedImage img = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, BufferedImage.TYPE_INT_RGB);
        String errors = "";
        for (String s : SYMBOLS) {
            if (s == null) {
                continue;
            }
            errors += test(img, s, Variation.DEFAULT);
            errors += test(img, s, Variation.MONO);
            errors += test(img, s, Variation.COLOR);
        }
        if (!errors.isEmpty()) {
            throw new RuntimeException(errors);
        }
    }

    private static String test(BufferedImage img, String symbol, Variation variation) {
        draw(img, symbol + variation.suffix);
        String error = check(img, variation.colorByDefault);
        if (error != null) {
            String name = symbol.chars().mapToObj(c -> {
                String s = Integer.toHexString(c);
                return "0".repeat(4 - s.length()) + s;
            }).collect(Collectors.joining("-")) + "-" + variation;
            try {
                ImageIO.write(img, "PNG", new File("EmojiVariation-" + name + ".png"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            return "\n" + name + ": " + error;
        }
        return "";
    }

    private static void draw(Image img, String symbol) {
        Graphics2D g = (Graphics2D) img.getGraphics();
        g.setColor(Color.white);
        g.fillRect(0, 0, IMG_WIDTH, IMG_HEIGHT);
        g.setFont(new Font(Font.DIALOG, Font.PLAIN, 50));
        g.setRenderingHint(KEY_TEXT_ANTIALIASING, VALUE_TEXT_ANTIALIAS_OFF);
        g.setColor(SYMBOL_COLOR);
        g.drawString(symbol, 2, 42);
        g.dispose();
    }

    private static String check(BufferedImage img, boolean expectColor) {
        boolean rendered = false;
        boolean color = false;
        for (int x = 0; x < IMG_WIDTH; x++) {
            for (int y = 0; y < IMG_HEIGHT; y++) {
                int rgb = img.getRGB(x, y);
                if (rgb != Color.white.getRGB()) {
                    rendered = true;
                    if (rgb != SYMBOL_COLOR.getRGB()) color = true;
                }
            }
        }
        if (!rendered) {
            return "Empty image";
        } else if (color != expectColor) {
            return expectColor ? "Expected color but rendered mono" : "Expected mono but rendered color";
        }
        return null;
    }

    private static void requireFont(String macOS, String windows, String linux) {
        String os = System.getProperty("os.name").toLowerCase();
        String font;
        if (os.contains("mac")) {
            font = macOS;
        } else if (os.contains("windows")) {
            font = windows;
        } else if (os.contains("linux")) {
            font = linux;
        } else {
            return;
        }
        String[] fs = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
        if (Stream.of(fs).noneMatch(s -> s.equals(font))) {
            throw new Error("Required font not found: " + font);
        }
    }
}