Java example source code file (CharToGlyphMapper.java)

This example Java source code file (CharToGlyphMapper.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

chartoglyphmapper, hi_surrogate_end, hi_surrogate_start, invisible_glyph_id, invisible_glyphs, lo_surrogate_end, lo_surrogate_start, uninitialized_glyph

The CharToGlyphMapper.java Java example source code

/*
 * Copyright (c) 2003, 2006, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

package sun.font;

/*
 * NB the versions that take a char as an int are used by the opentype
 * layout engine. If that remains in native these methods may not be
 * needed in the Java class.
 */
public abstract class CharToGlyphMapper {

    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 UNINITIALIZED_GLYPH = -1;
    public static final int INVISIBLE_GLYPH_ID = 0xffff;
    public static final int INVISIBLE_GLYPHS   = 0xfffe; // and above

    protected int missingGlyph = CharToGlyphMapper.UNINITIALIZED_GLYPH;

    public int getMissingGlyphCode() {
        return missingGlyph;
    }

    /* Default implementations of these methods may be overridden by
     * subclasses which have special requirements or optimisations
     */

    public boolean canDisplay(char ch) {
        int glyph = charToGlyph(ch);
        return glyph != missingGlyph;
    }

    public boolean canDisplay(int cp) {
        int glyph = charToGlyph(cp);
        return glyph != missingGlyph;
    }

    public int charToGlyph(char unicode) {
        char[] chars = new char[1];
        int[] glyphs = new int[1];
        chars[0] = unicode;
        charsToGlyphs(1, chars, glyphs);
        return glyphs[0];
    }

    public int charToGlyph(int unicode) {
        int[] chars = new int[1];
        int [] glyphs = new int[1];
        chars[0] = unicode;
        charsToGlyphs(1, chars, glyphs);
        return glyphs[0];
    }

    public abstract int getNumGlyphs();

    public abstract void charsToGlyphs(int count,
                                       char[] unicodes, int[] glyphs);

    public abstract boolean charsToGlyphsNS(int count,
                                            char[] unicodes, int[] glyphs);

    public abstract void charsToGlyphs(int count,
                                       int[] unicodes, int[] glyphs);

}