IDisplayServer.java from BIRT at Krugle

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/***********************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Actuate Corporation - initial API and implementation
 ***********************************************************************/

package org.eclipse.birt.chart.device;

import java.net.URL;
import java.util.Locale;

import org.eclipse.birt.chart.exception.ChartException;
import org.eclipse.birt.chart.model.attribute.ColorDefinition;
import org.eclipse.birt.chart.model.attribute.FontDefinition;
import org.eclipse.birt.chart.model.attribute.Size;
import org.eclipse.birt.chart.model.component.Label;

import com.ibm.icu.util.ULocale;

/**
 * Provides generic services to a device renderer for computing metrics and
 * centralized creation of device specific resources. This class is analogus to
 * an X server interface associated with a device.
 */
public interface IDisplayServer
{

	/**
	 * Lists out all resources that were previously logged explicitly by the
	 * <code>logCreation(Object)</code> method or those internally created by
	 * each of the resource creation methods. Once this method is invoked, all
	 * entries written into the log should be flushed.
	 */
	void debug( );

	/**
	 * Log creation of a resource for which leaks are to be tracked
	 * 
	 * @param o
	 *            A device-specific object being created
	 */
	void logCreation( Object o );

	/**
	 * Attempts to create a new font resource associated with a specific device
	 * for use in rendering or computations
	 * 
	 * @param fd
	 *            An font description for which a device specific resource is
	 *            being requested
	 * 
	 * @return A device specific font
	 */
	Object createFont( FontDefinition fd );

	/**
	 * Attempts to create a new color resource associated with a specific device
	 * 
	 * @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
	 * 
	 * @param url
	 *            The URL associated with the image location
	 * 
	 * @return An instance of an image associated with the specified URL
	 * 
	 * @throws ImageLoadingException
	 */
	Object loadImage( URL url ) throws ChartException;

	/**
	 * Returns the size(width, height) of the device specific image that was
	 * previously loaded by the <code>loadImage(URL)</code> method
	 * 
	 * @param oImage
	 *            The image for which the size is being requested
	 * 
	 * @return The size of the image
	 */
	Size getSize( Object oImage );

	/**
	 * An observer is typically associated with certain device types to aid in
	 * image loading and image metadata retrieval.
	 * 
	 * @return An image observer associated with a specific device renderer
	 */
	Object getObserver( );

	/**
	 * An instance of a text metrics computation class capable of providing text
	 * metric information associated with a given Label to aid in typically
	 * computing the size of rendered text
	 * 
	 * @param la
	 *            The Label instance for which text metrics are being requested
	 * 
	 * @return Text metrics associated with the specified Label instance
	 */
	ITextMetrics getTextMetrics( Label la );

	/**
	 * Provides the locale to display server implementations as needed to
	 * retrieve localized resources for presentation.
	 * 
	 * @return locale
	 * @deprecated use {@link #getULocale()} instead.
	 */
	Locale getLocale( );

	/**
	 * Provides the locale to display server implementations as needed to
	 * retrieve localized resources for presentation.
	 * 
	 * @return ulocale
	 * @since 2.1
	 */
	ULocale getULocale( );

}
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