org.jpedal.fonts.tt.Hmtx Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
Show all versions of OpenViewerFX Show documentation
An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2015 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
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 int[] hMetrics;
private short[] leftSideBearing;
private float scaling=1f/1000f;
public Hmtx(final FontFile2 currentFontFile, final int glyphCount,int metricsCount, final int maxAdvance){
scaling=maxAdvance;
if(metricsCount<0) {
metricsCount = -metricsCount;
}
//move to start and check exists
final int startPointer=currentFontFile.selectTable(FontFile2.HMTX);
int lsbCount=glyphCount-metricsCount;
//System.out.println("start="+Integer.toHexString(startPointer)+" lsbCount="+lsbCount+" glyphCount="+glyphCount+" metricsCount="+metricsCount);
hMetrics = new int[glyphCount];
leftSideBearing = new short[glyphCount];
int currentMetric=0;
//read 'head' table
if(startPointer==0){
LogWriter.writeLog("No Htmx table found");
}else if(lsbCount<0){
LogWriter.writeLog("Invalid Htmx table found");
}else{
int i ;
for (i = 0; i < metricsCount; i++){
currentMetric=currentFontFile.getNextUint16();
hMetrics[i] =currentMetric;
leftSideBearing[i] = currentFontFile.getNextInt16();
//System.out.println(i+"="+hMetrics[i]+" "+leftSideBearing[i]);
}
//workout actual number of values in table
final int tableLength=currentFontFile.getTableSize(FontFile2.HMTX);
final int lsbBytes=tableLength-(i*4); //each entry above used 4 bytes
lsbCount=(lsbBytes/2); //each entry contains 2 bytes
//catch needed for 48789.pdf
try{
//read additional lsb entries
for(int j=i;j=leftSideBearing.length) {
return 0;
} else {
return leftSideBearing[i];
}
}
public short getLeftSideBearing(final int i) {
final int length=hMetrics.length;
if (i < length) {
return (short)(hMetrics[i] & 0xffff);
} else if(leftSideBearing==null){
return 0;
}else{
final int ptr=i-length;
if(ptr>=0 && ptr> 16;
} else {
return hMetrics[hMetrics.length - 1] >> 16;
}*/
return ( (hMetrics[i]-getLeftSideBearing(i))/scaling);
}
public float getWidth(final int i) {
/**if (i < hMetrics.length) {
return hMetrics[i] >> 16;
} else {
return hMetrics[hMetrics.length - 1] >> 16;
}*/
final float w=hMetrics[i];
return ( (w)/scaling);
}
public float getUnscaledWidth(final int i) {
return hMetrics[i];
}
}