Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/device/IDisplayServer.java
* 
	 * @param cd
	 *            A color description for which a device specific resource is
	 *            being requested
	 * 
	 * @return A device specific color
	 */
	Object getColor( ColorDefinition cd );
	/**
	 * Returns the resolution of the device in dots per inch As an example, for
	 * a display screen, the dots correspond to pixels and a typical value for a
	 * Win32 OS is 96 DPI.
	 * 
	 * @return The integral dots per inch associated with the device
	 */
	int getDpiResolution( );
	/**
	 * Sets the dpi resolution. This defines how many dots per inch to use for
	 * rendering the chart. This is optional, the display server will compute
	 * the default dpi resolution of the display where the chart is rendered. It
	 * is mostly intended to be used for creating high resolution images.
	 * 
	 * @param dpi
	 *            The number of dots per inch
	 */
	void setDpiResolution( int dpi );
	/**
	 * Attempts to use device specific libraries to load an image for use with
	 * the device renderer
	 *