1 /*
   2  * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.font;
  27 
  28 /*
  29  * NB the versions that take a char as an int are used by the opentype
  30  * layout engine. If that remains in native these methods may not be
  31  * needed in the Java class.
  32  */
  33 public abstract class CharToGlyphMapper {
  34 
  35     public static final int HI_SURROGATE_START = 0xD800;
  36     public static final int HI_SURROGATE_END = 0xDBFF;
  37     public static final int LO_SURROGATE_START = 0xDC00;
  38     public static final int LO_SURROGATE_END = 0xDFFF;
  39     public static final int VS_START = 0xFE00;
  40     public static final int VS_END = 0xFE0F;
  41     public static final int VSS_START = 0xE0100;
  42     public static final int VSS_END = 0xE01FF;
  43 
  44     public static final int UNINITIALIZED_GLYPH = -1;
  45     public static final int INVISIBLE_GLYPH_ID = 0xffff;
  46     public static final int INVISIBLE_GLYPHS   = 0xfffe; // and above
  47 
  48     protected int missingGlyph = CharToGlyphMapper.UNINITIALIZED_GLYPH;
  49 
  50     public int getMissingGlyphCode() {
  51         return missingGlyph;
  52     }
  53 
  54     /* Default implementations of these methods may be overridden by
  55      * subclasses which have special requirements or optimisations
  56      */
  57 
  58     public boolean canDisplay(char ch) {
  59         int glyph = charToGlyph(ch);
  60         return glyph != missingGlyph;
  61     }
  62 
  63     public boolean canDisplay(int cp) {
  64         int glyph = charToGlyph(cp);
  65         return glyph != missingGlyph;
  66     }
  67 
  68     public int charToGlyph(char unicode) {
  69         char[] chars = new char[1];
  70         int[] glyphs = new int[1];
  71         chars[0] = unicode;
  72         charsToGlyphs(1, chars, glyphs);
  73         return glyphs[0];
  74     }
  75 
  76     public int charToGlyph(int unicode) {
  77         int[] chars = new int[1];
  78         int [] glyphs = new int[1];
  79         chars[0] = unicode;
  80         charsToGlyphs(1, chars, glyphs);
  81         return glyphs[0];
  82     }
  83 
  84     public abstract int getNumGlyphs();
  85 
  86     public abstract void charsToGlyphs(int count,
  87                                        char[] unicodes, int[] glyphs);
  88 
  89     public abstract boolean charsToGlyphsNS(int count,
  90                                             char[] unicodes, int[] glyphs);
  91 
  92     public abstract void charsToGlyphs(int count,
  93                                        int[] unicodes, int[] glyphs);
  94 
  95     protected boolean hasVariationSelectorGlyph(int charCode,
  96                                                 int variationSelector) {
  97         return false;
  98     }
  99  
 100     public static boolean isBaseChar(int charCode) {
 101         int type = Character.getType(charCode);
 102         if (type == Character.UNASSIGNED ||
 103             type == Character.CONTROL ||
 104             type == Character.FORMAT ||
 105             type == Character.NON_SPACING_MARK) { 
 106             return false;
 107         }
 108         return java.text.Normalizer.isNormalized(
 109                    java.nio.CharBuffer.wrap(Character.toChars(charCode)),
 110                    java.text.Normalizer.Form.NFD);
 111     }
 112 
 113     public static boolean isVariationSelector(int charCode) {
 114         return ((charCode >= VSS_START && charCode <= VSS_END) ||
 115                 (charCode >= VS_START && charCode <= VS_END));
 116     }
 117 
 118     public static boolean isVariationSelector(char charCode) {
 119         return (charCode >= VS_START && charCode <= VS_END);
 120     }
 121 
 122     public static boolean isVariationSelector(char charCode1,
 123                                               char charCode2) {
 124         return (charCode1 == 0xDB40 &&
 125                 (charCode2 >= 0xDD00 && charCode2 <= 0xDDEF));
 126                 // VSS_START - VSS_END
 127     }
 128 
 129 }