8316206: Test StretchedFontTest.java fails for Baekmuk font

test/jdk/java/awt/font/FontScaling/StretchedFontTest.java

@@ -26,6 +26,7 @@
 import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
+import java.awt.font.FontRenderContext;
 import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
 import java.io.File;
@@ -61,15 +62,19 @@ public final class StretchedFontTest {
             new Color(0x7F000000, true)
     };
 
+    /** Locale for getting font names. */
+    private static final Locale ENGLISH_LOCALE = Locale.ENGLISH;
+
     private static final AffineTransform STRETCH_TRANSFORM =
             AffineTransform.getScaleInstance(2.0, 1.0);
 
     public static void main(String[] args) {
         List<String> errors =
                 Arrays.stream(getLocalGraphicsEnvironment()
-                              .getAvailableFontFamilyNames(Locale.ENGLISH))
+                              .getAvailableFontFamilyNames(ENGLISH_LOCALE))
                       .map(family -> new Font(family, Font.PLAIN, FONT_SIZE))
                       .filter(font -> font.canDisplay(TEXT.codePointAt(0)))
+                      .filter(font -> !isBrokenFont(font))
                       .map(font -> font.deriveFont(STRETCH_TRANSFORM))
                       .flatMap(StretchedFontTest::testFont)
                       .filter(Objects::nonNull)
@@ -82,6 +87,26 @@ public static void main(String[] args) {
         }
     }
 
+    /**
+     * Checks whether the font renders the glyph in {@code TEXT} and
+     * returns {@code true} if the glyph isn't rendered.
+     *
+     * @param font the font to test
+     * @return {@code true} if the visual bounds of {@code TEXT} are empty, and
+     *         {@code false} otherwise
+     */
+    private static boolean isBrokenFont(final Font font) {
+        final boolean empty =
+                font.createGlyphVector(new FontRenderContext(null, false, false),
+                                       TEXT)
+                    .getVisualBounds()
+                    .isEmpty();
+        if (empty) {
+            System.err.println("Broken font: " + font.getFontName(ENGLISH_LOCALE));
+        }
+        return empty;
+    }
+
     /**
      * Tests the font with a set of text antialiasing hints.
      *
@@ -145,7 +170,7 @@ private static String testFont(final Font font,
         if (verifyImage(image)) {
             return null;
         }
-        String fontName = font.getFontName(Locale.ENGLISH);
+        String fontName = font.getFontName(ENGLISH_LOCALE);
         String hintValue = getHintString(hint);
         String hexColor = String.format("0x%08x", foreground.getRGB());
         saveImage(image, fontName + "-" + hintValue + "-" + hexColor);