org.jpedal.fonts.tt.Hmtx Maven / Gradle / Ivy
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/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/java-pdf-library-support/
*
* (C) Copyright 1997-2013, IDRsolutions and Contributors.
*
* This file is part of JPedal
*
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* Hmtx.java
* ---------------
*/
package org.jpedal.fonts.tt;
import org.jpedal.utils.LogWriter;
public class Hmtx extends Table {
private static final long serialVersionUID = 79254234215177405L;
private int[] hMetrics;
private short[] leftSideBearing;
private float scaling = 1f / 1000f;
public Hmtx(FontFile2 currentFontFile, int glyphCount, int metricsCount, int maxAdvance) {
this.scaling = maxAdvance;
if (metricsCount < 0) metricsCount = -metricsCount;
// move to start and check exists
int startPointer = currentFontFile.selectTable(FontFile2.HMTX);
int lsbCount = glyphCount - metricsCount;
// System.out.println("start="+Integer.toHexString(startPointer)+" lsbCount="+lsbCount+" glyphCount="+glyphCount+" metricsCount="+metricsCount);
this.hMetrics = new int[glyphCount];
this.leftSideBearing = new short[glyphCount];
int currentMetric = 0;
// read 'head' table
if (startPointer == 0) {
if (LogWriter.isOutput()) LogWriter.writeLog("No Htmx table found");
}
else
if (lsbCount < 0) {
if (LogWriter.isOutput()) LogWriter.writeLog("Invalid Htmx table found");
}
else {
int i;
for (i = 0; i < metricsCount; i++) {
currentMetric = currentFontFile.getNextUint16();
this.hMetrics[i] = currentMetric;
this.leftSideBearing[i] = currentFontFile.getNextInt16();
// System.out.println(i+"="+hMetrics[i]+" "+leftSideBearing[i]);
}
// workout actual number of values in table
int tableLength = currentFontFile.getTableSize(FontFile2.HMTX);
int lsbBytes = tableLength - (i * 4); // each entry above used 4 bytes
lsbCount = (lsbBytes / 2); // each entry contains 2 bytes
// read additional lsb entries
for (int j = i; j < lsbCount; j++) {
this.hMetrics[j] = currentMetric;
this.leftSideBearing[j] = currentFontFile.getFWord();
// System.out.println((j)+" "+leftSideBearing[j]);
}
}
}
public Hmtx() {}
// used by OTF code for aligning CFF font data
public short getRAWLSB(int i) {
if (this.leftSideBearing == null || i >= this.leftSideBearing.length) return 0;
else return this.leftSideBearing[i];
}
public short getLeftSideBearing(int i) {
if (i < this.hMetrics.length) {
return (short) (this.hMetrics[i] & 0xffff);
}
else
if (this.leftSideBearing == null) {
return 0;
}
else {
try {
return this.leftSideBearing[i - this.hMetrics.length];
}
catch (Exception e) {
return 0;
}
}
}
public float getAdvanceWidth(int i) {
/**
* if (i < hMetrics.length) { return hMetrics[i] >> 16; } else { return hMetrics[hMetrics.length - 1] >> 16; }
*/
return ((this.hMetrics[i] - getLeftSideBearing(i)) / this.scaling);
}
public float getWidth(int i) {
/**
* if (i < hMetrics.length) { return hMetrics[i] >> 16; } else { return hMetrics[hMetrics.length - 1] >> 16; }
*/
float w = this.hMetrics[i];
return ((w) / this.scaling);
}
public float getUnscaledWidth(int i) {
return this.hMetrics[i];
}
}