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
import org.eclipse.birt.report.engine.content.IContent;
import org.eclipse.birt.report.engine.content.IForeignContent;
import org.eclipse.birt.report.engine.content.IImageContent;
import org.eclipse.birt.report.engine.content.ILabelContent;
import org.eclipse.birt.report.engine.content.IStyle;
import org.eclipse.birt.report.engine.content.impl.ActionContent;
import org.eclipse.birt.report.engine.content.impl.ContainerContent;
import org.eclipse.birt.report.engine.content.impl.ImageContent;
import org.eclipse.birt.report.engine.content.impl.LabelContent;
import org.eclipse.birt.report.engine.content.impl.ReportContent;
import org.eclipse.birt.report.engine.content.impl.TextContent;
import org.eclipse.birt.report.engine.css.dom.StyleDeclaration;
import org.eclipse.birt.report.engine.css.engine.value.css.CSSValueConstants;
import org.eclipse.birt.report.engine.ir.DimensionType;
import org.eclipse.birt.report.engine.parser.TextParser;
import org.eclipse.birt.report.engine.util.FileUtil;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
public class HTML2Content
{
	protected static final HashMap tag2Style = new HashMap( );
	
	protected static final HashSet htmlDisplayMode = new HashSet( );
	
	protected static final HashSet supportedHTMLElementTags = new HashSet();
	
	protected static final HashMap textTypeMapping = new HashMap( );
	
	protected ActionContent action = null;