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 
  40     public static final int UNINITIALIZED_GLYPH = -1;
  41     public static final int INVISIBLE_GLYPH_ID = 0xffff;
  42     public static final int INVISIBLE_GLYPHS   = 0xfffe; // and above
  43 
  44     protected int missingGlyph = CharToGlyphMapper.UNINITIALIZED_GLYPH;
  45 
  46     public int getMissingGlyphCode() {
  47         return missingGlyph;
  48     }
  49 
  50     /* Default implementations of these methods may be overridden by
  51      * subclasses which have special requirements or optimisations
  52      */
  53 
  54     public boolean canDisplay(char ch) {
  55         int glyph = charToGlyph(ch);
  56         return glyph != missingGlyph;
  57     }
  58 
  59     public boolean canDisplay(int cp) {
  60         int glyph = charToGlyph(cp);
  61         return glyph != missingGlyph;
  62     }
  63 
  64     public int charToGlyph(char unicode) {
  65         char[] chars = new char[1];
  66         int[] glyphs = new int[1];
  67         chars[0] = unicode;
  68         charsToGlyphs(1, chars, glyphs);
  69         return glyphs[0];
  70     }
  71 
  72     public int charToGlyph(int unicode) {
  73         int[] chars = new int[1];
  74         int [] glyphs = new int[1];
  75         chars[0] = unicode;
  76         charsToGlyphs(1, chars, glyphs);
  77         return glyphs[0];
  78     }
  79 
  80     public abstract int getNumGlyphs();
  81 
  82     public abstract void charsToGlyphs(int count,
  83                                        char[] unicodes, int[] glyphs);
  84 
  85     public abstract boolean charsToGlyphsNS(int count,
  86                                             char[] unicodes, int[] glyphs);
  87 
  88     public abstract void charsToGlyphs(int count,
  89                                        int[] unicodes, int[] glyphs);
  90 
  91 }