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/*
*
* Copyright 2001-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*
*/
package com.sun.javaone.mailman.ui.image;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
public class GraphicsUtil {
private static GraphicsConfiguration configuration = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
private GraphicsUtil() {
}
public static BufferedImage createCompatibleImage(int width, int height) {
return configuration.createCompatibleImage(width, height);
}
public static BufferedImage createTranslucentCompatibleImage(int width, int height) {
return configuration.createCompatibleImage(width, height, Transparency.TRANSLUCENT);
}
public static BufferedImage loadCompatibleImage(URL resource) throws IOException {
BufferedImage image = ImageIO.read(resource);
return toCompatibleImage(image);
}
public static BufferedImage toCompatibleImage(BufferedImage image) {
BufferedImage compatibleImage = configuration.createCompatibleImage(image.getWidth(),
image.getHeight(), Transparency.TRANSLUCENT);
Graphics g = compatibleImage.getGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
return compatibleImage;
}
public static BufferedImage createThumbnailFast(BufferedImage image, int requestedThumbSize) {
float ratio = (float) image.getWidth() / (float) image.getHeight();
BufferedImage temp = new BufferedImage(requestedThumbSize,
(int) (requestedThumbSize / ratio),
image.getType());
Graphics2D g2 = temp.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
g2.dispose();
return temp;
}
public static BufferedImage createThumbnail(BufferedImage image, int requestedThumbSize) {
float ratio = (float) image.getWidth() / (float) image.getHeight();
int width = image.getWidth();
boolean divide = requestedThumbSize < width;
BufferedImage thumb = image;
do {
if (divide) {
width /= 2;
if (width < requestedThumbSize) {
width = requestedThumbSize;
}
} else {
width *= 2;
if (width > requestedThumbSize) {
width = requestedThumbSize;
}
}
BufferedImage temp = new BufferedImage(width, (int) (width / ratio),
image.getType());
Graphics2D g2 = temp.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(thumb, 0, 0, temp.getWidth(), temp.getHeight(), null);
g2.dispose();
thumb = temp;
} while (width != requestedThumbSize);
return thumb;
}
} |
