8216965: crash in freetypeScaler.c CopyBW2Grey8

Reviewed-by: serb, mbaesken

src/share/native/sun/font/freetypeScaler.c

@@ -803,7 +803,10 @@ Java_sun_font_FreetypeFontScaler_getGlyphImageNative(
     /* generate bitmap if it is not done yet
      e.g. if algorithmic styling is performed and style was added to outline */
     if (ftglyph->format == FT_GLYPH_FORMAT_OUTLINE) {
-        FT_Render_Glyph(ftglyph, FT_LOAD_TARGET_MODE(target));
+        error = FT_Render_Glyph(ftglyph, FT_LOAD_TARGET_MODE(target));
+        if (error != 0) {
+            return ptr_to_jlong(getNullGlyphImage());
+        }
     }
 
     width  = (UInt16) ftglyph->bitmap.width;

test/java/awt/FontClass/FontSize1Test.java

+/*
+ * Copyright (c) 2019, 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 8216965
+ * @summary verify no crash when rendering size 1 fonts
+ */
+
+import java.awt.Font;
+import java.awt.Graphics2D;
+import java.awt.GraphicsEnvironment;
+import java.awt.image.BufferedImage;
+
+public class FontSize1Test {
+
+    static final String text = "abcdefghijklmnopqrstuvwxyz";
+
+    public static void main(String[] args) {
+
+        BufferedImage bi =
+            new BufferedImage(100, 20, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g2d = bi.createGraphics();
+        Font af[] =
+            GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
+
+        for (Font f : af) {
+            System.out.println("Looking at font " + f);
+            g2d.setFont(f);
+            g2d.getFontMetrics().getWidths();
+            g2d.drawString(text, 50, 10);
+        }
+        g2d.dispose();
+    }
+
+}