src/java.desktop/share/classes/sun/font/CharToGlyphMapper.java

@@ -34,10 +34,14 @@
 
     public static final int HI_SURROGATE_START = 0xD800;
     public static final int HI_SURROGATE_END = 0xDBFF;
     public static final int LO_SURROGATE_START = 0xDC00;
     public static final int LO_SURROGATE_END = 0xDFFF;
+    public static final int VS_START = 0xFE00;
+    public static final int VS_END = 0xFE0F;
+    public static final int VSS_START = 0xE0100;
+    public static final int VSS_END = 0xE01FF;
 
     public static final int UNINITIALIZED_GLYPH = -1;
     public static final int INVISIBLE_GLYPH_ID = 0xffff;
     public static final int INVISIBLE_GLYPHS   = 0xfffe; // and above
 

@@ -86,6 +90,40 @@
                                             char[] unicodes, int[] glyphs);
 
     public abstract void charsToGlyphs(int count,
                                        int[] unicodes, int[] glyphs);
 
+    protected boolean hasVariationSelectorGlyph(int charCode,
+                                                int variationSelector) {
+        return false;
+    }
+ 
+    public static boolean isBaseChar(int charCode) {
+        int type = Character.getType(charCode);
+        if (type == Character.UNASSIGNED ||
+            type == Character.CONTROL ||
+            type == Character.FORMAT ||
+            type == Character.NON_SPACING_MARK) { 
+            return false;
+        }
+        return java.text.Normalizer.isNormalized(
+                   java.nio.CharBuffer.wrap(Character.toChars(charCode)),
+                   java.text.Normalizer.Form.NFD);
+    }
+
+    public static boolean isVariationSelector(int charCode) {
+        return ((charCode >= VSS_START && charCode <= VSS_END) ||
+                (charCode >= VS_START && charCode <= VS_END));
+    }
+
+    public static boolean isVariationSelector(char charCode) {
+        return (charCode >= VS_START && charCode <= VS_END);
+    }
+
+    public static boolean isVariationSelector(char charCode1,
+                                              char charCode2) {
+        return (charCode1 == 0xDB40 &&
+                (charCode2 >= 0xDD00 && charCode2 <= 0xDDEF));
+                // VSS_START - VSS_END
+    }
+
 }