Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.device.swt/src/org/eclipse/birt/chart/device/swt/SwtTextRenderer.java
for ( int j = 0; j < clipWs; j++ )
			{
				imgdtaS.setPixel( j, i, imgdtaS.transparentPixel );
			}
		}
		final GC gc = new GC( imgSource );
		final Font f = (Font) _sxs.createFont( fd );
		final Rectangle r = new Rectangle( (int) dX,
				(int) ( dY - dFH ),
				(int) dFW,
				(int) dFH );
		
		final boolean bFullyTransparent = ( ( (ColorDefinition) la.getBackground( ) ).getTransparency( ) == 0 );
		if ( !bFullyTransparent )
		{
			final Color clrBackground = (Color) _sxs.getColor( (ColorDefinition) la.getBackground( ) );
			gc.setBackground( clrBackground );
			gc.fillRectangle( r );
			clrBackground.dispose( );
		}
		else
		{
			final Color cTransparent = new Color( getDevice( ),
					0x12,
					0x34,
					0x56 );
			gc.setBackground( cTransparent );
			gc.fillRectangle( r );
			cTransparent.dispose( );
		}