Bug 123939 [Smoke][Regression]Drill through link doesn't work in pdf.
Description: Drill through link doesn't work in pdf. Steps to reproduce: 1. View attached design file url.rptdesign in html/pdf, click the drill though link in the last three image. Result: Drill through link doesn't work in pdf. Some links in html also don't work.
engine/org.eclipse.birt.report.engine.emitter.pdf/src/org/eclipse/birt/report/engine/emitter/pdf/PDFEmitter.java
{
		return layoutMeasure/(float)layout2PdfRatio;
	}
	/**
	 * convert the X coordinate of a point from layout to X coordinate in PDF
	 * @param layoutX 		the X coordinate specified from layout
	 * @return				the PDF X coordinate
	 */
	private float layoutPointX2PDF(int layoutX)
	{
		return pdfMeasure(layoutX);
	}
	
	/**
	 * convert the Y coordinate of a point from layout to Y coordinate in PDF
	 * @param layoutY 		the Y coordinate specified from layout
	 * @return				the PDF Y coordinate
	 */
	private float layoutPointY2PDF (int layoutY)
	{
		return pageHeight - pdfMeasure(layoutY);
	}
	
	/**
	 * convert the left X coordinate of an Area from layout 
	 * to the left X coordinate in PDF
	 * @param layoutX 		the X coordinate specified from layout
	 * @return				the PDF X coordinate
	 */
	private float layoutAreaX2PDF(int layoutX)