com.sun.pdfview.font.ttf.LocaTable Maven / Gradle / Ivy
/*
* $Id: LocaTable.java,v 1.3 2009/03/15 12:33:17 tomoke Exp $
*
* Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.sun.pdfview.font.ttf;
import java.nio.ByteBuffer;
/**
* Model the TrueType Loca table
*/
public class LocaTable extends TrueTypeTable {
/** if true, the table stores glyphs in long format */
private boolean isLong;
/** the offsets themselves */
private int offsets[];
/** Creates a new instance of HmtxTable */
protected LocaTable(TrueTypeFont ttf) {
super (TrueTypeTable.LOCA_TABLE);
MaxpTable maxp = (MaxpTable) ttf.getTable("maxp");
int numGlyphs = maxp.getNumGlyphs();
HeadTable head = (HeadTable) ttf.getTable("head");
short format = head.getIndexToLocFormat();
isLong = (format == 1);
offsets = new int[numGlyphs + 1];
}
/**
* get the offset, in bytes, of a given glyph from the start of
* the glyph table
*/
public int getOffset(int glyphID) {
return offsets[glyphID];
}
/**
* get the size, in bytes, of the given glyph
*/
public int getSize(int glyphID) {
return offsets[glyphID + 1] - offsets[glyphID];
}
/**
* Return true if the glyphs arte in long (int) format, or
* false if they are in short (short) format
*/
public boolean isLongFormat() {
return isLong;
}
/** get the data in this map as a ByteBuffer */
public ByteBuffer getData() {
int size = getLength();
ByteBuffer buf = ByteBuffer.allocate(size);
// write the offsets
for (int i = 0; i < offsets.length; i++) {
if (isLongFormat()) {
buf.putInt(offsets[i]);
} else {
buf.putShort((short) (offsets[i] / 2));
}
}
// reset the start pointer
buf.flip();
return buf;
}
/** Initialize this structure from a ByteBuffer */
public void setData(ByteBuffer data) {
for (int i = 0; i < offsets.length; i++) {
if (isLongFormat()) {
offsets[i] = data.getInt();
} else {
offsets[i] = 2 * ( 0xFFFF & (int) data.getShort());
}
}
}
/**
* Get the length of this table
*/
public int getLength() {
if (isLongFormat()) {
return offsets.length * 4;
} else {
return offsets.length * 2;
}
}
}