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TwelveMonkeys Common image support classes.
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/*
 * Copyright (c) 2008, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.image;

import com.twelvemonkeys.lang.Validate;

import javax.swing.*;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

/**
 * An {@code Icon} implementation backed by a {@code BufferedImage}.
 *
 * @author Harald Kuhr
 * @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/image/BufferedImageIcon.java#2 $
 */
public class BufferedImageIcon implements Icon {
    private final BufferedImage image;
    private final int width;
    private final int height;
    private final boolean fast;

    public BufferedImageIcon(BufferedImage pImage) {
        this(pImage, pImage != null ? pImage.getWidth() : 0, pImage != null ? pImage.getHeight() : 0);
    }

    public BufferedImageIcon(BufferedImage pImage, int pWidth, int pHeight) {
        this(pImage, pWidth, pHeight, pImage.getWidth() == pWidth && pImage.getHeight() == pHeight);
    }

    public BufferedImageIcon(BufferedImage pImage, int pWidth, int pHeight, boolean useFastRendering) {
        image = Validate.notNull(pImage, "image");
        width = Validate.isTrue(pWidth > 0, pWidth, "width must be positive: %d");
        height = Validate.isTrue(pHeight > 0, pHeight, "height must be positive: %d");

        fast = useFastRendering;
    }

    public int getIconHeight() {
        return height;
    }

    public int getIconWidth() {
        return width;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        if (fast || !(g instanceof Graphics2D)) {
            //System.out.println("Scaling fast");
            g.drawImage(image, x, y, width, height, null);
        }
        else {
            //System.out.println("Scaling using interpolation");
            Graphics2D g2 = (Graphics2D) g;
            AffineTransform transform = AffineTransform.getTranslateInstance(x, y);
            transform.scale(width / (double) image.getWidth(), height / (double) image.getHeight());
            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2.drawImage(image, transform, null);
        }
    }
}