/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.pdmodel.font;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.geom.NoninvertibleTransformException;
import java.io.IOException;
import java.util.HashMap;
import org.apache.fontbox.afm.FontMetric;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSNumber;
import org.apache.pdfbox.cos.COSInteger;
import org.apache.pdfbox.encoding.Encoding;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.common.PDStream;
/**
* This class contains implementation details of the simple pdf fonts.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.18 $
*/
public abstract class PDSimpleFont extends PDFont
{
private final HashMap<Integer, Float> mFontSizes =
new HashMap<Integer, Float>(128);
private float avgFontWidth = 0.0f;
/**
* Log instance.
*/
private static final Log log = LogFactory.getLog(PDSimpleFont.class);
/**
* Constructor.
*/
public PDSimpleFont()
{
super();
}
/**
* Constructor.
*
* @param fontDictionary The font dictionary according to the PDF specification.
*/
public PDSimpleFont( COSDictionary fontDictionary )
{
super( fontDictionary );
}
/**
* Looks up, creates, returns the AWT Font.
*/
public Font getawtFont() throws IOException
{
log.error("Not yet implemented:" + getClass().getName() );
return null;
}
/**
* {@inheritDoc}
*/
public void drawString( String string, Graphics g, float fontSize,
AffineTransform at, float x, float y ) throws IOException
{
Font _awtFont = getawtFont();
// mdavis - fix fontmanager.so/dll on sun.font.FileFont.getGlyphImage
// for font with bad cmaps?
if (_awtFont.canDisplayUpTo(string) != -1) {
log.warn("Changing font on <" + string + "> from <"
+ _awtFont.getName() + "> to the default font");
_awtFont = Font.decode(null);
}
Graphics2D g2d = (Graphics2D)g;
g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
writeFont(g2d, at, _awtFont, x, y, string);
}
/**
* This will get the font height for a character.
*
* @param c The character code to get the width for.
* @param offset The offset into the array.
* @param length The length of the data.
*
* @return The width is in 1000 unit of text space, ie 333 or 777
*
* @throws IOException If an error occurs while parsing.
*/
public float getFontHeight( byte[] c, int offset, int length ) throws IOException
{
float retval = 0;
int code = getCodeFromArray( c, offset, length );
FontMetric metric = getAFM();
if( metric != null )
{
Encoding encoding = getEncoding();
String characterName = encoding.getName( code );
retval = metric.getCharacterHeight( characterName );
}
else
{
PDFontDescriptor desc = getFontDescriptor();
if( desc != null )
{
float xHeight = desc.getXHeight();
float capHeight = desc.getCapHeight();
if( xHeight != 0f && capHeight != 0 )
{
//do an average of these two. Can we do better???
retval = (xHeight + capHeight)/2f;
}
else if( xHeight != 0 )
{
retval = xHeight;
}
else if( capHeight != 0 )
{
retval = capHeight;
}
else
{
retval = 0;
}
//hmm, not sure if this is 100% correct
//but gives a height, Should we add Descent as well??
if( retval == 0 )
{
retval = desc.getAscent();
}
}
}
return retval;
}
/**
* This will get the font width for a character.
*
* @param c The character code to get the width for.
* @param offset The offset into the array.
* @param length The length of the data.
*
* @return The width is in 1000 unit of text space, ie 333 or 777
*
* @throws IOException If an error occurs while parsing.
*/
public float getFontWidth( byte[] c, int offset, int length ) throws IOException
{
int code = getCodeFromArray( c, offset, length );
Float fontWidth = mFontSizes.get(code);
if (fontWidth == null)
{
//hmm should this be in a subclass??
COSInteger firstChar = (COSInteger)font.getDictionaryObject( COSName.FIRST_CHAR );
COSInteger lastChar = (COSInteger)font.getDictionaryObject( COSName.LAST_CHAR );
if( firstChar != null && lastChar != null )
{
long first = firstChar.intValue();
long last = lastChar.intValue();
if( code >= first && code <= last && font.getDictionaryObject( COSName.WIDTHS ) != null )
{
COSArray widthArray = (COSArray)font.getDictionaryObject( COSName.WIDTHS );
COSNumber fontWidthObject = (COSNumber)widthArray.getObject( (int)(code - first) );
fontWidth = fontWidthObject.floatValue();
}
else
{
fontWidth = getFontWidthFromAFMFile( code );
}
}
else
{
fontWidth = getFontWidthFromAFMFile( code );
}
mFontSizes.put(code, fontWidth);
}
return fontWidth;
}
/**
* This will get the average font width for all characters.
*
* @return The width is in 1000 unit of text space, ie 333 or 777
*
* @throws IOException If an error occurs while parsing.
*/
public float getAverageFontWidth() throws IOException
{
float average = 0.0f;
//AJW
if (avgFontWidth != 0.0f)
{
average = avgFontWidth;
}
else
{
float totalWidth = 0.0f;
float characterCount = 0.0f;
COSArray widths = (COSArray)font.getDictionaryObject( COSName.WIDTHS );
if( widths != null )
{
for( int i=0; i<widths.size(); i++ )
{
COSNumber fontWidth = (COSNumber)widths.getObject( i );
if( fontWidth.floatValue() > 0 )
{
totalWidth += fontWidth.floatValue();
characterCount += 1;
}
}
}
if( totalWidth > 0 )
{
average = totalWidth / characterCount;
}
else
{
average = getAverageFontWidthFromAFMFile();
}
avgFontWidth = average;
}
return average;
}
/**
* This will get the font descriptor for this font.
*
* @return The font descriptor for this font.
*
* @throws IOException If there is an error parsing an AFM file, or unable to
* create a PDFontDescriptor object.
*/
public PDFontDescriptor getFontDescriptor() throws IOException
{
if(fontDescriptor ==null){
COSDictionary fd = (COSDictionary)font.getDictionaryObject( COSName.FONT_DESC );
if( fd == null )
{
FontMetric afm = getAFM();
if( afm != null )
{
fontDescriptor = new PDFontDescriptorAFM( afm );
}
else
{
COSArray descendantFontArray =
(COSArray)font.getDictionaryObject( COSName.DESCENDANT_FONTS );
if (descendantFontArray != null)
{
fd = (COSDictionary)descendantFontArray.getObject( 0 );
if (fd != null)
{
fd = (COSDictionary)fd.getDictionaryObject( COSName.FONT_DESC );
if (fd != null)
{
fontDescriptor = new PDFontDescriptorDictionary( fd );
}
}
}
}
}
else
{
fontDescriptor = new PDFontDescriptorDictionary( fd );
}
}
return fontDescriptor;
}
private PDFontDescriptor fontDescriptor = null;
/**
* This will set the font descriptor.
*
* @param fontDescriptor The font descriptor.
*/
public void setFontDescriptor( PDFontDescriptorDictionary fontDescriptor )
{
COSDictionary dic = null;
if( fontDescriptor != null )
{
dic = fontDescriptor.getCOSDictionary();
}
font.setItem( COSName.FONT_DESC, dic );
this.fontDescriptor = fontDescriptor;
}
/**
* This will get the ToUnicode stream.
*
* @return The ToUnicode stream.
* @throws IOException If there is an error getting the stream.
*/
public PDStream getToUnicode() throws IOException
{
return PDStream.createFromCOS( font.getDictionaryObject( COSName.TO_UNICODE ) );
}
/**
* This will set the ToUnicode stream.
*
* @param unicode The unicode stream.
*/
public void setToUnicode( PDStream unicode )
{
font.setItem( COSName.TO_UNICODE, unicode );
}
/**
* This will get the fonts bounding box.
*
* @return The fonts bouding box.
*
* @throws IOException If there is an error getting the bounding box.
*/
public PDRectangle getFontBoundingBox() throws IOException
{
return getFontDescriptor().getFontBoundingBox();
}
/**
* This will draw a string on a canvas using the font.
*
* @param g2d The graphics to draw onto.
* @param at The transformation matrix with all infos for scaling and shearing of the font.
* @param awtFont The font to draw.
* @param x The x coordinate to draw at.
* @param y The y coordinate to draw at.
* @param string The string to draw.
*
*/
protected void writeFont(final Graphics2D g2d, final AffineTransform at, final Font awtFont,
final float x, final float y, final String string)
{
// check if we have a rotation
if (!at.isIdentity())
{
try
{
AffineTransform atInv = at.createInverse();
// do only apply the size of the transform, rotation will be realized by rotating the graphics,
// otherwise the hp printers will not render the font
g2d.setFont(awtFont.deriveFont(1f));
// apply the inverse transformation to the graphics, which should be the same as applying the
// transformation itself to the text
g2d.transform(at);
// translate the coordinates
Point2D.Float newXy = new Point2D.Float(x,y);
atInv.transform(new Point2D.Float( x, y), newXy);
g2d.drawString( string, (float)newXy.getX(), (float)newXy.getY() );
// restore the original transformation
g2d.transform(atInv);
}
catch (NoninvertibleTransformException e)
{
log.error("Error in "+getClass().getName()+".writeFont",e);
}
}
else
{
g2d.setFont( awtFont.deriveFont( at ) );
g2d.drawString( string, x, y );
}
}
}