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/area/impl/AbstractArea.java
.getProperty( StyleConstants.STYLE_MARGIN_RIGHT ) );
	}
	
	
	/**
	 * get allocated height
	 * 
	 * @return
	 */
	public int getAllocatedHeight( )
	{
		int topMarginHeight = PropertyUtil.getDimensionValue( style
				.getProperty( StyleConstants.STYLE_MARGIN_TOP ) );
		int bottomMarginHeight = PropertyUtil.getDimensionValue( style
				.getProperty( StyleConstants.STYLE_MARGIN_BOTTOM ) );
		int result = 0;
		if( topMarginHeight >= 0) result = height + topMarginHeight;
		if( bottomMarginHeight >= 0) result = result + bottomMarginHeight;
		return result;
	}
	/**
	 * get style of this area
	 */
	public IStyle getStyle( )
	{
		return style;
	}
	/**
	 * get X possition of this area
	 */