Bug 151697 PDF Render performance enhancement
When trying to find out why our reports were taking so long to render to pdf (itext) we found out that a simple fix would allow them to run 5 to 6 times faster. Using TPTP we found out that a significant part of the time spent in the rendering process was at the constructor of org.eclipse.birt.report.engine.layout.area.impl.TextArea That constructor runs several initialization methods of the owned Style instance, using a constant as parameter style.setXXXX(CSSConstants.CSS_NONE_VALUE). Each of this methods of org.eclipse.birt.report.engine.css.dom.AbstractStyle invoke a method setCssText(int index,String cssText ) that will go througth a process of parsing , etc . This can be changed at the begining of the method checking it the input parameter is CSSConstants.CSS_NONE_VALUE, and if true just return CSSValueConstants.NUMBER_0. public void setCssText( int index, String cssText ) { //begin fix if (CSSConstants.CSS_NONE_VALUE.equals(cssText)) { setProperty( index,CSSValueConstants.NUMBER_0); return; } //end fix if ( cssText != null ) { ...... Something similiar can be done at the begining of method parsePropertyValue(int idx, String value) from the the class CSSValue public CSSValue parsePropertyValue(int idx, String value) { //begin fix if (CSSConstants.CSS_NONE_VALUE.equals(value)) return CSSValueConstants.NUMBER_0; //end fix assert idx >= 0 && idx < pm.getNumberOfProperties(); ...... This change of the code we come from 20 minutes to 3:15 on a ~1200 pages pdf. A similiar improvement as noticed much smaller reports. As this is a so simple change and didn't attached the code. Thanks Joao
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/util/HTML2Content.java
supportedHTMLElementTags.add("U"); 
		
		
		
		
		htmlDisplayMode.add( "dd" ); 
		htmlDisplayMode.add( "div" ); 
		htmlDisplayMode.add( "dl" ); 
		htmlDisplayMode.add( "dt" ); 
		htmlDisplayMode.add( "h1" ); 
		htmlDisplayMode.add( "h2" ); 
		htmlDisplayMode.add( "h3" ); 
		htmlDisplayMode.add( "h4" ); 
		htmlDisplayMode.add( "h5" ); 
		htmlDisplayMode.add( "h6" ); 
		htmlDisplayMode.add( "hr" ); 
		htmlDisplayMode.add( "ol" ); 
		htmlDisplayMode.add( "p" ); 
		htmlDisplayMode.add( "pre" ); 
		htmlDisplayMode.add( "ul" ); 
		htmlDisplayMode.add( "li" ); 
		htmlDisplayMode.add( "body" ); 
		htmlDisplayMode.add( "center" ); 
		
		textTypeMapping.put( IForeignContent.HTML_TYPE, TextParser.TEXT_TYPE_HTML );
		textTypeMapping.put( IForeignContent.TEXT_TYPE, TextParser.TEXT_TYPE_PLAIN );
		textTypeMapping.put( IForeignContent.UNKNOWN_TYPE, TextParser.TEXT_TYPE_AUTO );
	}
	
	public HTML2Content( String rootPath)