Bug 194371 Use page emitter framework to implement ppt emitter.
In order to keep consistent with pdf and postscript, ppt need to use page emitter framework.
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
{
			positionX = PropertyUtil.getPercentageValue( positionValX );
			xMode = true;
		}
		else
		{
			positionX = pptMeasure( PropertyUtil.getDimensionValue( positionValX ) );
			xMode = false;
		}
		if ( positionValY.getPrimitiveType( ) == CSSPrimitiveValue.CSS_PERCENTAGE )
		{
			positionY = PropertyUtil.getPercentageValue( positionValY );
			yMode = true;
		}
		else
		{
			positionY = pptMeasure( PropertyUtil.getDimensionValue( positionValY ) );
			yMode = false;
		}
		drawBackgroundImage( bi,
				startX,
				startY,
				width,
				height,
				positionX,
				positionY,
				containerStyle.getBackgroundRepeat( ),
				xMode,
				yMode );
	}