Bug 313459 Problem with % when generating images in tables.
See the attached BirtProject, it has two reports. Each identical except for this difference: The image width/height is set to a %age value (50%) in one (TestImage.rptdesign) and not-set in the other (TestImageWorking.rptdesign). TestImage.rptdesign does not display the image in pdf, but works fine in html. TestImageWorking.rptdesign shows the image in both pdf and html. The %age setting seems to cause the problem in pdf format.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/util/PropertyUtil.java
{
			try
			{
				screenDpi = Toolkit.getDefaultToolkit( ).getScreenResolution( );
			}
			catch ( HeadlessException e )
			{
				screenDpi = 0;
			}
			if ( screenDpi < 96 || screenDpi > 120 )
			{
				screenDpi = 0;
			}
		}
		return screenDpi;
	}
	public static int getDimensionValue( CSSValue value )
	{
		return getDimensionValue( value, 96, 0 );
	}
	/**
	 * @deprecated keep for backward compatibility.
	 */
	public static int getDimensionValue( CSSValue value, int referenceLength )
	{
		return getDimensionValue( value, 96, referenceLength );
	}
	public static int getDimensionValueConsiderDpi( CSSValue value,
			IContent content )
	{