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/PDFAbstractLM.java
CSSPrimitiveValue.CSS_NUMBER, hs[2] ) );
		style.setProperty( IStyle.STYLE_BORDER_LEFT_WIDTH, new FloatValue(
				CSSPrimitiveValue.CSS_NUMBER, vs[5] ) );
		style.setProperty( IStyle.STYLE_BORDER_RIGHT_WIDTH, new FloatValue(
				CSSPrimitiveValue.CSS_NUMBER, vs[4] ) );
		style.setProperty( IStyle.STYLE_BORDER_TOP_WIDTH, new FloatValue(
				CSSPrimitiveValue.CSS_NUMBER, hs[5] ) );
		style.setProperty( IStyle.STYLE_BORDER_BOTTOM_WIDTH, new FloatValue(
				CSSPrimitiveValue.CSS_NUMBER, hs[4] ) );
	}
	protected int getDimensionValue( String d )
	{
		if ( d == null )
		{
			return 0;
		}
		try
		{
			if ( d.endsWith( "in" ) || d.endsWith( "in" ) ) 
			{
				return (int) ( ( Float.valueOf( d
						.substring( 0, d.length( ) - 2 ) ).floatValue( ) ) * 72000.0f );
			}
			else if ( d.endsWith( "cm" ) || d.endsWith( "CM" ) ) 
			{
				return (int) ( ( Float.valueOf( d
						.substring( 0, d.length( ) - 2 ) ).floatValue( ) ) * 72000.0f / 2.54f );
			}
			else if ( d.endsWith( "mm" ) || d.endsWith( "MM" ) ) 
			{