org.github.avatar.ui.AvatarImage.java Source code

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Here is the source code for org.github.avatar.ui.AvatarImage.java

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/*******************************************************************************
 *  Copyright (c) 2011 GitHub Inc.
 *  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:
 *    Kevin Sawicki (GitHub Inc.) - initial API and implementation
 *******************************************************************************/
package org.github.avatar.ui;

import java.io.ByteArrayInputStream;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;

/**
 * Avatar image class.
 * 
 * @author Kevin Sawicki (kevin@github.com)
 */
public class AvatarImage {

    private Avatar avatar;
    private ImageData data;

    /**
     * Create avatar image from avatar
     * 
     * @param avatar
     */
    public AvatarImage(Avatar avatar) {
        Assert.isNotNull(avatar, "Avatar cannot be null"); //$NON-NLS-1$
        this.avatar = avatar;
    }

    /**
     * Get avatar image data
     * 
     * @return image data
     */
    public ImageData getData() {
        if (this.data != null)
            return this.data;

        try {
            ImageData[] images = new ImageLoader().load(new ByteArrayInputStream(avatar.getBytes()));
            if (images.length > 0)
                this.data = images[0];
            else
                this.data = ImageDescriptor.getMissingImageDescriptor().getImageData();
        } catch (SWTException exception) {
            this.data = ImageDescriptor.getMissingImageDescriptor().getImageData();
        }
        return this.data;
    }

    /**
     * Get avatar image scaled to specified size. The returned image should be
     * managed and properly disposed of by the caller.
     * 
     * @param size
     * @return scaled image
     */
    public Image getScaledImage(int size) {
        Display display = PlatformUI.getWorkbench().getDisplay();
        Image image = new Image(display, getData());
        Rectangle sourceBounds = image.getBounds();

        // Return original image and don't scale if size matches request
        if (sourceBounds.width == size)
            return image;

        Image scaled = new Image(display, size, size);
        GC gc = new GC(scaled);
        try {
            gc.setAntialias(SWT.ON);
            gc.setInterpolation(SWT.HIGH);
            Rectangle targetBounds = scaled.getBounds();
            gc.drawImage(image, 0, 0, sourceBounds.width, sourceBounds.height, 0, 0, targetBounds.width,
                    targetBounds.height);
        } finally {
            gc.dispose();
            image.dispose();
        }
        return scaled;
    }

}