fop/src/org/apache/fop/pdf/PDFFontDescriptor.java

/*-- $Id$ --

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                   The Apache Software License, Version 1.1
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    include  the following  acknowledgment:  "This product includes  software
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 This software  consists of voluntary contributions made  by many individuals
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 James Tauber <jtauber@jtauber.com>. For more  information on the Apache
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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) {
	}
}