test/jdk/java/awt/FontMetrics/ExtremeFontSizeTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.util.HashMap;
import java.util.Map;

/*
 * @test
 * @bug 8328896 8357672
 * @summary test that using very large font sizes used don't break later uses
 */

public class ExtremeFontSizeTest {

    static BufferedImage bi = new BufferedImage(1,1,1);
    static Graphics2D g2d = bi.createGraphics();
    static String testString = "M";
    static Font font = new Font("SansSerif", Font.PLAIN, 12);
    static int fontSize = 0;
    static boolean failed = false;
    static int[] fontSizes = { 10, 12, 1000, 2000, 20000, 100000, 8 };
    static double[] scales = { 1.0, 900.0};
    static boolean[] fms = { false, true };

    static class Key {
        int fontSize;
        double scale;
        boolean fm;
        String str;


        Key(int fs, double sc, boolean f, String s) {
            fontSize = fs;
            scale = sc;
            fm = f;
            str = s;
        }

        public boolean equals(Object o) {
           return
               (o instanceof Key k) &&
                this.fontSize == k.fontSize &&
                this.scale == k.scale &&
                this.fm == k.fm &&
                this.str.equals(k.str);
        }

        public int hashCode() {
           return fontSize + (int)scale + (fm ? 1 : 0) + str.hashCode();
        }
    }

    static class Value {
        int height;
        double strBounds;
        Rectangle pixelBounds;
        Rectangle2D visualBounds;

        Value(int h, double sb, Rectangle pb, Rectangle2D vb) {
            height = h;
            strBounds = sb;
            pixelBounds = pb;
            visualBounds = vb;
        }

        public boolean equals(Object o) {
           return
               (o instanceof Value v) &&
                this.height == v.height &&
                this.strBounds == v.strBounds &&
                this.pixelBounds.equals(v.pixelBounds) &&
                this.visualBounds.equals(v.visualBounds);
        }

        public int hashCode() {
           return height + (int)strBounds + pixelBounds.hashCode() + visualBounds.hashCode();
        }
    }

    static Map<Key, Value> metricsMap = new HashMap<Key, Value>();

    public static void main(String[] args) {
        Font[] fonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
        for (Font f : fonts) {
            font = f.deriveFont(Font.PLAIN, 12);
            System.out.println("Test font : " + font);
            if (font.canDisplayUpTo(testString) != -1) {
                System.out.println("Skipping since cannot display test string");
                continue;
            }
            metricsMap = new HashMap<Key, Value>();
            testFont();
        }
    }

    static void testFont() {

        /* run tests validating bounds etc are non-zero
         * then run with extreme scales for which zero is allowed - but not required
         * then run the first tests again to be sure they are still reasonable.
        */
        runTests(true, false);
        test(5_000_000, 10_000, false, testString, false, false, false);
        test(5_000_000, 10_000, true, testString, false, false, false);
        test(0, 0.00000001, false, testString, false, false, false);
        runTests(false, true);

        if (failed) {
            throw new RuntimeException("Test failed. Check stdout log.");
        }
    }

    static void runTests(boolean add, boolean check) {
        for (int fontSize : fontSizes) {
            for (double scale : scales) {
                for (boolean fm : fms) {
                    test(fontSize, scale, fm, testString, true, add, check);
                }
            }
        }
    }

    static void test(int size, double scale, boolean fm, String str,
                     boolean checkAll, boolean add, boolean check) {

        AffineTransform at = AffineTransform.getScaleInstance(scale, scale);
        FontRenderContext frc = new FontRenderContext(at, false, fm);
        font = font.deriveFont((float)size);
        g2d.setTransform(at);
        g2d.setFont(font);
        FontMetrics metrics = g2d.getFontMetrics();
        int height = metrics.getHeight();
        double width = font.getStringBounds(str, frc).getWidth();

        GlyphVector gv = font.createGlyphVector(frc, str.toCharArray());
        Rectangle pixelBounds = gv.getPixelBounds(frc, 0, 0);
        Rectangle2D visualBounds = gv.getVisualBounds();

        System.out.println("Test parameters: size="+size+" scale="+scale+" fm="+fm+" str="+str);
        System.out.println("font height="+metrics.getHeight());
        System.out.println("string bounds width="+width);
        System.out.println("GlyphVector Pixel Bounds="+ pixelBounds);
        System.out.println("GlyphVector Visual Bounds="+ visualBounds);


        if (height < 0 || width < 0 || pixelBounds.getWidth() < 0 || visualBounds.getWidth() < 0) {
            failed = true;
            System.out.println(" *** Unexpected negative size reported  *** ");
         }
         if (!checkAll) {
            System.out.println();
            return;
        }

        if (height == 0 || width == 0 || (pixelBounds.isEmpty()) || visualBounds.isEmpty() ) {
            failed = true;
            System.out.println("Pixel bounds empty="+pixelBounds.isEmpty());
            System.out.println("Visual bounds empty="+visualBounds.isEmpty());
            System.out.println(" *** RESULTS NOT AS EXPECTED  *** ");
        }
        System.out.println();

        Key k = null;
        Value v = null;
        if (add || check) {
             k = new Key(size, scale, fm, str);
             v = new Value(height, width, pixelBounds, visualBounds);
        }
        if (add) {
             metricsMap.put(k, v);
        }
        if (check) {
            Value vmap = metricsMap.get(k);
            if (!v.equals(vmap)) {
               failed = true;
               System.out.println("Values differ");
            }
        }
    }
}