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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.pdf;
/**
* class representing a font descriptor.
*
* Font descriptors are specified on page 222 and onwards of the PDF 1.3 spec.
*/
public class PDFFontDescriptor extends PDFObject {
// Required fields
protected int ascent;
protected int capHeight;
protected int descent;
protected int flags;
protected PDFRectangle fontBBox;
protected String basefont; // PDF-spec: FontName
protected int italicAngle;
protected int stemV;
// Optional fields
protected int stemH = 0;
protected int xHeight = 0;
protected int leading = 0;
protected int avgWidth = 0;
protected int maxWidth = 0;
protected int missingWidth = 0;
protected PDFStream fontfile;
// protected String charSet = null;
protected byte subtype;
/**
* create the /FontDescriptor object
*
* @param number the object's number
* @param ascent the maximum height above the baseline
* @param descent the maximum depth below the baseline
* @param capHeight height of the capital letters
* @param flags various characteristics of the font
* @param fontBBox the bounding box for the described font
* @param basefont the base font name
* @param italicAngle the angle of the vertical dominant strokes
* @param stemV the width of the dominant vertical stems of glyphs
*/
public PDFFontDescriptor(int number, String basefont, int ascent,
int descent, int capHeight, int flags,
PDFRectangle fontBBox, int italicAngle,
int stemV) {
/* generic creation of PDF object */
super(number);
/* set fields using paramaters */
this.basefont = basefont;
this.ascent = ascent;
this.descent = descent;
this.capHeight = capHeight;
this.flags = flags;
this.fontBBox = fontBBox;
this.italicAngle = italicAngle;
this.stemV = stemV;
}
/**
* set the optional metrics
*/
public void setMetrics(int avgWidth, int maxWidth, int missingWidth,
int leading, int stemH, int xHeight) {
this.avgWidth = avgWidth;
this.maxWidth = maxWidth;
this.missingWidth = missingWidth;
this.leading = leading;
this.stemH = stemH;
this.xHeight = xHeight;
}
/**
* set the optional font file stream
*
* @param subtype the font type defined in the font stream
* @param fontfile the stream containing an embedded font
*/
public void setFontFile(byte subtype, PDFStream fontfile) {
this.subtype = subtype;
this.fontfile = fontfile;
}
// public void setCharSet(){}//for subset fonts
/**
* produce the PDF representation for the object
*
* @return the PDF
*/
public byte[] toPDF() {
StringBuffer p = new StringBuffer(this.number + " " + this.generation
+ " obj\n<< /Type /FontDescriptor"
+ "\n/FontName /" + this.basefont);
p.append("\n/FontBBox ");
p.append(fontBBox.toPDFString());
p.append("\n/Flags ");
p.append(flags);
p.append("\n/CapHeight ");
p.append(capHeight);
p.append("\n/Ascent ");
p.append(ascent);
p.append("\n/Descent ");
p.append(descent);
p.append("\n/ItalicAngle ");
p.append(italicAngle);
p.append("\n/StemV ");
p.append(stemV);
// optional fields
if (stemH != 0) {
p.append("\n/StemH ");
p.append(stemH);
}
if (xHeight != 0) {
p.append("\n/XHeight ");
p.append(xHeight);
}
if (avgWidth != 0) {
p.append("\n/AvgWidth ");
p.append(avgWidth);
}
if (maxWidth != 0) {
p.append("\n/MaxWidth ");
p.append(maxWidth);
}
if (missingWidth != 0) {
p.append("\n/MissingWidth ");
p.append(missingWidth);
}
if (leading != 0) {
p.append("\n/Leading ");
p.append(leading);
}
if (fontfile != null) {
switch (subtype) {
case PDFFont.TYPE1:
p.append("\n/FontFile ");
break;
case PDFFont.TRUETYPE:
p.append("\n/FontFile2 ");
break;
case PDFFont.TYPE0:
p.append("\n/FontFile2 ");
break;
default:
p.append("\n/FontFile2 ");
}
p.append(fontfile.referencePDF());
}
// charSet for subset fonts // not yet implemented
// CID optional field
fillInPDF(p);
p.append("\n >>\nendobj\n");
return p.toString().getBytes();
}
/**
* fill in the specifics for the font's descriptor.
*
* the given buffer already contains the fields common to all descriptors.
*
* @param begin the buffer to be completed with the specific fields
*/
protected void fillInPDF(StringBuffer begin) {}
}
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