Java/Advanced Graphics/Shadow
Drop Shadow Demo
/*
* Copyright (c) 2007, Romain Guy
* 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 TimingFramework project 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
* OWNER 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.
*/
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.awt.GraphicsConfiguration;
import java.awt.Transparency;
import java.awt.Graphics;
import java.awt.GraphicsEnvironment;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.ruposite;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.io.IOException;
import javax.swing.Box;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
/**
* @author Romain Guy <romain.guy@mac.ru>
*/
public class DropShadowDemo extends JFrame {
private BlurTestPanel blurTestPanel;
private JSlider shadowSizeSlider;
private JSlider shadowOpacitySlider;
private JCheckBox fastRenderingCheck;
public DropShadowDemo() {
super("Drop Shadow");
blurTestPanel = new BlurTestPanel();
add(blurTestPanel);
shadowSizeSlider = new JSlider(1, 20, 5);
shadowSizeSlider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
blurTestPanel.setShadowSize(shadowSizeSlider.getValue());
}
});
shadowOpacitySlider = new JSlider(0, 100, 50);
shadowOpacitySlider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
blurTestPanel.setShadowOpacity((float) shadowOpacitySlider.getValue() / 100.0f);
}
});
fastRenderingCheck = new JCheckBox("Fast rendering");
fastRenderingCheck.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
blurTestPanel.setFastRendering(fastRenderingCheck.isSelected());
}
});
JPanel metaControls = new JPanel(new GridLayout(3, 1));
JPanel controls = new JPanel(new FlowLayout(FlowLayout.LEFT));
controls.add(new JLabel("Size: 1px"));
controls.add(shadowSizeSlider);
controls.add(new JLabel("20px"));
metaControls.add(controls);
controls = new JPanel(new FlowLayout(FlowLayout.LEFT));
controls.add(new JLabel("Opacity: 0%"));
controls.add(shadowOpacitySlider);
controls.add(new JLabel("100%"));
metaControls.add(controls);
controls = new JPanel(new FlowLayout(FlowLayout.LEFT));
controls.add(fastRenderingCheck);
metaControls.add(controls);
add(metaControls, BorderLayout.SOUTH);
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private static class BlurTestPanel extends JPanel {
private BufferedImage image = null;
private BufferedImage imageA;
private int shadowSize = 5;
private boolean fastRendering = false;
private float shadowOpacity = 0.5f;
public BlurTestPanel() {
try {
imageA = GraphicsUtilities.loadCompatibleImage(getClass().getResource("A.png"));
} catch (IOException e) {
e.printStackTrace();
}
setOpaque(false);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(imageA.getWidth(), imageA.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
if (image == null) {
long start = System.nanoTime();
if (!fastRendering) {
image = createDropShadow(imageA, shadowSize);
} else {
ShadowRenderer renderer = new ShadowRenderer(shadowSize / 2, 1.0f, Color.BLACK);
image = renderer.createShadow(imageA);
}
long delay = System.nanoTime() - start;
System.out.println("time = " + (delay / 1000.0f / 1000.0f) + "ms");
}
int x = (getWidth() - imageA.getWidth()) / 2;
int y = (getHeight() - imageA.getHeight()) / 2;
Graphics2D g2 = (Graphics2D) g;
Composite c = g2.getComposite();
g2.setComposite(AlphaComposite.SrcOver.derive(shadowOpacity));
if (!fastRendering) {
g.drawImage(image, x - shadowSize * 2 + 5, y - shadowSize * 2 + 5, null);
} else {
g.drawImage(image, x - shadowSize / 2 + 5, y - shadowSize / 2 + 5, null);
}
g2.setComposite(c);
g.drawImage(imageA, x, y, null);
}
public void setShadowSize(int radius) {
this.shadowSize = radius;
image = null;
repaint();
}
private void setFastRendering(boolean fastRendering) {
this.fastRendering = fastRendering;
image = null;
repaint();
}
private void setShadowOpacity(float shadowOpacity) {
this.shadowOpacity = shadowOpacity;
image = null;
repaint();
}
}
public static BufferedImage createDropShadow(BufferedImage image,
int size) {
BufferedImage shadow = new BufferedImage(
image.getWidth() + 4 * size,
image.getHeight() + 4 * size,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = shadow.createGraphics();
g2.drawImage(image, size * 2, size * 2, null);
g2.setComposite(AlphaComposite.SrcIn);
g2.setColor(Color.BLACK);
g2.fillRect(0, 0, shadow.getWidth(), shadow.getHeight());
g2.dispose();
shadow = getGaussianBlurFilter(size, true).filter(shadow, null);
shadow = getGaussianBlurFilter(size, false).filter(shadow, null);
return shadow;
}
public static ConvolveOp getGaussianBlurFilter(int radius,
boolean horizontal) {
if (radius < 1) {
throw new IllegalArgumentException("Radius must be >= 1");
}
int size = radius * 2 + 1;
float[] data = new float[size];
float sigma = radius / 3.0f;
float twoSigmaSquare = 2.0f * sigma * sigma;
float sigmaRoot = (float) Math.sqrt(twoSigmaSquare * Math.PI);
float total = 0.0f;
for (int i = -radius; i <= radius; i++) {
float distance = i * i;
int index = i + radius;
data[index] = (float) Math.exp(-distance / twoSigmaSquare) / sigmaRoot;
total += data[index];
}
for (int i = 0; i < data.length; i++) {
data[i] /= total;
}
Kernel kernel = null;
if (horizontal) {
kernel = new Kernel(size, 1, data);
} else {
kernel = new Kernel(1, size, data);
}
return new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
}
public static void main(String... args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DropShadowDemo().setVisible(true);
}
});
}
}
/*
* Copyright (c) 2007, Romain Guy
* 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 TimingFramework project 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
* OWNER 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.
*/
/**
* <p><code>GraphicsUtilities</code> contains a set of tools to perform
* common graphics operations easily. These operations are divided into
* several themes, listed below.</p>
* <h2>Compatible Images</h2>
* <p>Compatible images can, and should, be used to increase drawing
* performance. This class provides a number of methods to load compatible
* images directly from files or to convert existing images to compatibles
* images.</p>
* <h2>Creating Thumbnails</h2>
* <p>This class provides a number of methods to easily scale down images.
* Some of these methods offer a trade-off between speed and result quality and
* shouuld be used all the time. They also offer the advantage of producing
* compatible images, thus automatically resulting into better runtime
* performance.</p>
* <p>All these methodes are both faster than
* {@link java.awt.Image#getScaledInstance(int, int, int)} and produce
* better-looking results than the various <code>drawImage()</code> methods
* in {@link java.awt.Graphics}, which can be used for image scaling.</p>
* <h2>Image Manipulation</h2>
* <p>This class provides two methods to get and set pixels in a buffered image.
* These methods try to avoid unmanaging the image in order to keep good
* performance.</p>
*
* @author Romain Guy <romain.guy@mac.ru>
*/
class GraphicsUtilities {
private GraphicsUtilities() {
}
// Returns the graphics configuration for the primary screen
private static GraphicsConfiguration getGraphicsConfiguration() {
return GraphicsEnvironment.getLocalGraphicsEnvironment().
getDefaultScreenDevice().getDefaultConfiguration();
}
/**
* <p>Returns a new <code>BufferedImage</code> using the same color model
* as the image passed as a parameter. The returned image is only compatible
* with the image passed as a parameter. This does not mean the returned
* image is compatible with the hardware.</p>
*
* @param image the reference image from which the color model of the new
* image is obtained
* @return a new <code>BufferedImage</code>, compatible with the color model
* of <code>image</code>
*/
public static BufferedImage createColorModelCompatibleImage(BufferedImage image) {
ColorModel cm = image.getColorModel();
return new BufferedImage(cm,
cm.createCompatibleWritableRaster(image.getWidth(),
image.getHeight()),
cm.isAlphaPremultiplied(), null);
}
/**
* <p>Returns a new compatible image with the same width, height and
* transparency as the image specified as a parameter.</p>
*
* @see java.awt.Transparency
* @see #createCompatibleImage(int, int)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleTranslucentImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param image the reference image from which the dimension and the
* transparency of the new image are obtained
* @return a new compatible <code>BufferedImage</code> with the same
* dimension and transparency as <code>image</code>
*/
public static BufferedImage createCompatibleImage(BufferedImage image) {
return createCompatibleImage(image, image.getWidth(), image.getHeight());
}
/**
* <p>Returns a new compatible image of the specified width and height, and
* the same transparency setting as the image specified as a parameter.</p>
*
* @see java.awt.Transparency
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(int, int)
* @see #createCompatibleTranslucentImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param width the width of the new image
* @param height the height of the new image
* @param image the reference image from which the transparency of the new
* image is obtained
* @return a new compatible <code>BufferedImage</code> with the same
* transparency as <code>image</code> and the specified dimension
*/
public static BufferedImage createCompatibleImage(BufferedImage image,
int width, int height) {
return getGraphicsConfiguration().createCompatibleImage(width, height,
image.getTransparency());
}
/**
* <p>Returns a new opaque compatible image of the specified width and
* height.</p>
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleTranslucentImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param width the width of the new image
* @param height the height of the new image
* @return a new opaque compatible <code>BufferedImage</code> of the
* specified width and height
*/
public static BufferedImage createCompatibleImage(int width, int height) {
return getGraphicsConfiguration().createCompatibleImage(width, height);
}
/**
* <p>Returns a new translucent compatible image of the specified width
* and height.</p>
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param width the width of the new image
* @param height the height of the new image
* @return a new translucent compatible <code>BufferedImage</code> of the
* specified width and height
*/
public static BufferedImage createCompatibleTranslucentImage(int width,
int height) {
return getGraphicsConfiguration().createCompatibleImage(width, height,
Transparency.TRANSLUCENT);
}
/**
* <p>Returns a new compatible image from a URL. The image is loaded from the
* specified location and then turned, if necessary into a compatible
* image.</p>
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleImage(int, int)
* @see #createCompatibleTranslucentImage(int, int)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param resource the URL of the picture to load as a compatible image
* @return a new translucent compatible <code>BufferedImage</code> of the
* specified width and height
* @throws java.io.IOException if the image cannot be read or loaded
*/
public static BufferedImage loadCompatibleImage(URL resource)
throws IOException {
BufferedImage image = ImageIO.read(resource);
return toCompatibleImage(image);
}
/**
* <p>Return a new compatible image that contains a copy of the specified
* image. This method ensures an image is compatible with the hardware,
* and therefore optimized for fast blitting operations.</p>
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleImage(int, int)
* @see #createCompatibleTranslucentImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @param image the image to copy into a new compatible image
* @return a new compatible copy, with the
* same width and height and transparency and content, of <code>image</code>
*/
public static BufferedImage toCompatibleImage(BufferedImage image) {
if (image.getColorModel().equals(
getGraphicsConfiguration().getColorModel())) {
return image;
}
BufferedImage compatibleImage =
getGraphicsConfiguration().createCompatibleImage(
image.getWidth(), image.getHeight(),
image.getTransparency());
Graphics g = compatibleImage.getGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
return compatibleImage;
}
/**
* <p>Returns a thumbnail of a source image. <code>newSize</code> defines
* the length of the longest dimension of the thumbnail. The other
* dimension is then computed according to the dimensions ratio of the
* original picture.</p>
* <p>This method favors speed over quality. When the new size is less than
* half the longest dimension of the source image,
* {@link #createThumbnail(BufferedImage, int)} or
* {@link #createThumbnail(BufferedImage, int, int)} should be used instead
* to ensure the quality of the result without sacrificing too much
* performance.</p>
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
* @param image the source image
* @param newSize the length of the largest dimension of the thumbnail
* @return a new compatible <code>BufferedImage</code> containing a
* thumbnail of <code>image</code>
* @throws IllegalArgumentException if <code>newSize</code> is larger than
* the largest dimension of <code>image</code> or <= 0
*/
public static BufferedImage createThumbnailFast(BufferedImage image,
int newSize) {
float ratio;
int width = image.getWidth();
int height = image.getHeight();
if (width > height) {
if (newSize >= width) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image width");
} else if (newSize <= 0) {
throw new IllegalArgumentException("newSize must" +
" be greater than 0");
}
ratio = (float) width / (float) height;
width = newSize;
height = (int) (newSize / ratio);
} else {
if (newSize >= height) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image height");
} else if (newSize <= 0) {
throw new IllegalArgumentException("newSize must" +
" be greater than 0");
}
ratio = (float) height / (float) width;
height = newSize;
width = (int) (newSize / ratio);
}
BufferedImage temp = createCompatibleImage(image, width, height);
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;
}
/**
* <p>Returns a thumbnail of a source image.</p>
* <p>This method favors speed over quality. When the new size is less than
* half the longest dimension of the source image,
* {@link #createThumbnail(BufferedImage, int)} or
* {@link #createThumbnail(BufferedImage, int, int)} should be used instead
* to ensure the quality of the result without sacrificing too much
* performance.</p>
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
* @param image the source image
* @param newWidth the width of the thumbnail
* @param newHeight the height of the thumbnail
* @return a new compatible <code>BufferedImage</code> containing a
* thumbnail of <code>image</code>
* @throws IllegalArgumentException if <code>newWidth</code> is larger than
* the width of <code>image</code> or if code>newHeight</code> is larger
* than the height of <code>image</code> or if one of the dimensions
* is <= 0
*/
public static BufferedImage createThumbnailFast(BufferedImage image,
int newWidth, int newHeight) {
if (newWidth >= image.getWidth() ||
newHeight >= image.getHeight()) {
throw new IllegalArgumentException("newWidth and newHeight cannot" +
" be greater than the image" +
" dimensions");
} else if (newWidth <= 0 || newHeight <= 0) {
throw new IllegalArgumentException("newWidth and newHeight must" +
" be greater than 0");
}
BufferedImage temp = createCompatibleImage(image, newWidth, newHeight);
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;
}
/**
* <p>Returns a thumbnail of a source image. <code>newSize</code> defines
* the length of the longest dimension of the thumbnail. The other
* dimension is then computed according to the dimensions ratio of the
* original picture.</p>
* <p>This method offers a good trade-off between speed and quality.
* The result looks better than
* {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
* the new size is less than half the longest dimension of the source
* image, yet the rendering speed is almost similar.</p>
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
* @param image the source image
* @param newSize the length of the largest dimension of the thumbnail
* @return a new compatible <code>BufferedImage</code> containing a
* thumbnail of <code>image</code>
* @throws IllegalArgumentException if <code>newSize</code> is larger than
* the largest dimension of <code>image</code> or <= 0
*/
public static BufferedImage createThumbnail(BufferedImage image,
int newSize) {
int width = image.getWidth();
int height = image.getHeight();
boolean isWidthGreater = width > height;
if (isWidthGreater) {
if (newSize >= width) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image width");
}
} else if (newSize >= height) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image height");
}
if (newSize <= 0) {
throw new IllegalArgumentException("newSize must" +
" be greater than 0");
}
float ratioWH = (float) width / (float) height;
float ratioHW = (float) height / (float) width;
BufferedImage thumb = image;
do {
if (isWidthGreater) {
width /= 2;
if (width < newSize) {
width = newSize;
}
height = (int) (width / ratioWH);
} else {
height /= 2;
if (height < newSize) {
height = newSize;
}
width = (int) (height / ratioHW);
}
BufferedImage temp = createCompatibleImage(image, width, height);
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 (newSize != (isWidthGreater ? width : height));
return thumb;
}
/**
* <p>Returns a thumbnail of a source image.</p>
* <p>This method offers a good trade-off between speed and quality.
* The result looks better than
* {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
* the new size is less than half the longest dimension of the source
* image, yet the rendering speed is almost similar.</p>
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int)
* @param image the source image
* @param newWidth the width of the thumbnail
* @param newHeight the height of the thumbnail
* @return a new compatible <code>BufferedImage</code> containing a
* thumbnail of <code>image</code>
* @throws IllegalArgumentException if <code>newWidth</code> is larger than
* the width of <code>image</code> or if code>newHeight</code> is larger
* than the height of <code>image or if one the dimensions is not > 0</code>
*/
public static BufferedImage createThumbnail(BufferedImage image,
int newWidth, int newHeight) {
int width = image.getWidth();
int height = image.getHeight();
if (newWidth >= width || newHeight >= height) {
throw new IllegalArgumentException("newWidth and newHeight cannot" +
" be greater than the image" +
" dimensions");
} else if (newWidth <= 0 || newHeight <= 0) {
throw new IllegalArgumentException("newWidth and newHeight must" +
" be greater than 0");
}
BufferedImage thumb = image;
do {
if (width > newWidth) {
width /= 2;
if (width < newWidth) {
width = newWidth;
}
}
if (height > newHeight) {
height /= 2;
if (height < newHeight) {
height = newHeight;
}
}
BufferedImage temp = createCompatibleImage(image, width, height);
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 != newWidth || height != newHeight);
return thumb;
}
/**
* <p>Returns an array of pixels, stored as integers, from a
* <code>BufferedImage</code>. The pixels are grabbed from a rectangular
* area defined by a location and two dimensions. Calling this method on
* an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
* and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
*
* @param img the source image
* @param x the x location at which to start grabbing pixels
* @param y the y location at which to start grabbing pixels
* @param w the width of the rectangle of pixels to grab
* @param h the height of the rectangle of pixels to grab
* @param pixels a pre-allocated array of pixels of size w*h; can be null
* @return <code>pixels</code> if non-null, a new array of integers
* otherwise
* @throws IllegalArgumentException is <code>pixels</code> is non-null and
* of length < w*h
*/
public static int[] getPixels(BufferedImage img,
int x, int y, int w, int h, int[] pixels) {
if (w == 0 || h == 0) {
return new int[0];
}
if (pixels == null) {
pixels = new int[w * h];
} else if (pixels.length < w * h) {
throw new IllegalArgumentException("pixels array must have a length" +
" >= w*h");
}
int imageType = img.getType();
if (imageType == BufferedImage.TYPE_INT_ARGB ||
imageType == BufferedImage.TYPE_INT_RGB) {
Raster raster = img.getRaster();
return (int[]) raster.getDataElements(x, y, w, h, pixels);
}
// Unmanages the image
return img.getRGB(x, y, w, h, pixels, 0, w);
}
/**
* <p>Writes a rectangular area of pixels in the destination
* <code>BufferedImage</code>. Calling this method on
* an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
* and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
*
* @param img the destination image
* @param x the x location at which to start storing pixels
* @param y the y location at which to start storing pixels
* @param w the width of the rectangle of pixels to store
* @param h the height of the rectangle of pixels to store
* @param pixels an array of pixels, stored as integers
* @throws IllegalArgumentException is <code>pixels</code> is non-null and
* of length < w*h
*/
public static void setPixels(BufferedImage img,
int x, int y, int w, int h, int[] pixels) {
if (pixels == null || w == 0 || h == 0) {
return;
} else if (pixels.length < w * h) {
throw new IllegalArgumentException("pixels array must have a length" +
" >= w*h");
}
int imageType = img.getType();
if (imageType == BufferedImage.TYPE_INT_ARGB ||
imageType == BufferedImage.TYPE_INT_RGB) {
WritableRaster raster = img.getRaster();
raster.setDataElements(x, y, w, h, pixels);
} else {
// Unmanages the image
img.setRGB(x, y, w, h, pixels, 0, w);
}
}
}
/*
* $Id: ShadowRenderer.java,v 1.1 2007/01/15 23:39:23 gfx Exp $
*
* Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* Licensed under LGPL.
*/
/**
* <p>A shadow renderer generates a drop shadow for any given picture, respecting
* the transparency channel if present. The resulting picture contains the
* shadow only and to create a drop shadow effect you will need to stack the
* original picture and the shadow generated by the renderer.</p>
* <h2>Shadow Properties</h2>
* <p>A shadow is defined by three properties:
* <ul>
* <li><i>size</i>: The size, in pixels, of the shadow. This property also
* defines the fuzzyness.</li>
* <li><i>opacity</i>: The opacity, between 0.0 and 1.0, of the shadow.</li>
* <li><i>color</i>: The color of the shadow. Shadows are not meant to be
* black only.</li>
* </ul>
* You can set these properties using the provided mutaters or the appropriate
* constructor. Here are two ways of creating a green shadow of size 10 and
* with an opacity of 50%:
* <pre>
* ShadowRenderer renderer = new ShadowRenderer(10, 0.5f, Color.GREEN);
* // ..
* renderer = new ShadowRenderer();
* renderer.setSize(10);
* renderer.setOpacity(0.5f);
* renderer.setColor(Color.GREEN);
* </pre>
* The default constructor provides the following default values:
* <ul>
* <li><i>size</i>: 5 pixels</li>
* <li><i>opacity</i>: 50%</li>
* <li><i>color</i>: Black</li>
* </ul></p>
* <h2>Generating a Shadow</h2>
* <p>A shadow is generated as a <code>BufferedImage</code> from another
* <code>BufferedImage</code>. Once the renderer is set up, you must call
* {@link #createShadow} to actually generate the shadow:
* <pre>
* ShadowRenderer renderer = new ShadowRenderer();
* // renderer setup
* BufferedImage shadow = renderer.createShadow(bufferedImage);
* </pre></p>
* <p>The generated image dimensions are computed as following:</p>
* <pre>
* width = imageWidth + 2 * shadowSize
* height = imageHeight + 2 * shadowSize
* </pre>
* <h2>Properties Changes</h2>
* <p>This renderer allows to register property change listeners with
* {@link #addPropertyChangeListener}. Listening to properties changes is very
* useful when you emebed the renderer in a graphical component and give the API
* user the ability to access the renderer. By listening to properties changes,
* you can easily repaint the component when needed.</p>
* <h2>Threading Issues</h2>
* <p><code>ShadowRenderer</code> is not guaranteed to be thread-safe.</p>
*
* @author Romain Guy <romain.guy@mac.ru>
* @author Sebastien Petrucci
*/
class ShadowRenderer {
/**
* <p>Identifies a change to the size used to render the shadow.</p>
* <p>When the property change event is fired, the old value and the new
* value are provided as <code>Integer</code> instances.</p>
*/
public static final String SIZE_CHANGED_PROPERTY = "shadow_size";
/**
* <p>Identifies a change to the opacity used to render the shadow.</p>
* <p>When the property change event is fired, the old value and the new
* value are provided as <code>Float</code> instances.</p>
*/
public static final String OPACITY_CHANGED_PROPERTY = "shadow_opacity";
/**
* <p>Identifies a change to the color used to render the shadow.</p>
*/
public static final String COLOR_CHANGED_PROPERTY = "shadow_color";
// size of the shadow in pixels (defines the fuzziness)
private int size = 5;
// opacity of the shadow
private float opacity = 0.5f;
// color of the shadow
private Color color = Color.BLACK;
// notifies listeners of properties changes
private PropertyChangeSupport changeSupport;
/**
* <p>Creates a default good looking shadow generator.
* The default shadow renderer provides the following default values:
* <ul>
* <li><i>size</i>: 5 pixels</li>
* <li><i>opacity</i>: 50%</li>
* <li><i>color</i>: Black</li>
* </ul></p>
* <p>These properties provide a regular, good looking shadow.</p>
*/
public ShadowRenderer() {
this(5, 0.5f, Color.BLACK);
}
/**
* <p>A shadow renderer needs three properties to generate shadows.
* These properties are:</p>
* <ul>
* <li><i>size</i>: The size, in pixels, of the shadow. This property also
* defines the fuzzyness.</li>
* <li><i>opacity</i>: The opacity, between 0.0 and 1.0, of the shadow.</li>
* <li><i>color</i>: The color of the shadow. Shadows are not meant to be
* black only.</li>
* </ul>
* @param size the size of the shadow in pixels. Defines the fuzziness.
* @param opacity the opacity of the shadow.
* @param color the color of the shadow.
*/
public ShadowRenderer(final int size, final float opacity, final Color color) {
//noinspection ThisEscapedInObjectConstruction
changeSupport = new PropertyChangeSupport(this);
setSize(size);
setOpacity(opacity);
setColor(color);
}
/**
* <p>Add a PropertyChangeListener to the listener list. The listener is
* registered for all properties. The same listener object may be added
* more than once, and will be called as many times as it is added. If
* <code>listener</code> is null, no exception is thrown and no action
* is taken.</p>
* @param listener the PropertyChangeListener to be added
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
changeSupport.addPropertyChangeListener(listener);
}
/**
* <p>Remove a PropertyChangeListener from the listener list. This removes
* a PropertyChangeListener that was registered for all properties. If
* <code>listener</code> was added more than once to the same event source,
* it will be notified one less time after being removed. If
* <code>listener</code> is null, or was never added, no exception is thrown
* and no action is taken.</p>
* @param listener the PropertyChangeListener to be removed
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
changeSupport.removePropertyChangeListener(listener);
}
/**
* <p>Gets the color used by the renderer to generate shadows.</p>
* @return this renderer"s shadow color
*/
public Color getColor() {
return color;
}
/**
* <p>Sets the color used by the renderer to generate shadows.</p>
* <p>Consecutive calls to {@link #createShadow} will all use this color
* until it is set again.</p>
* <p>If the color provided is null, the previous color will be retained.</p>
* @param shadowColor the generated shadows color
*/
public void setColor(final Color shadowColor) {
if (shadowColor != null) {
Color oldColor = this.color;
this.color = shadowColor;
changeSupport.firePropertyChange(COLOR_CHANGED_PROPERTY,
oldColor,
this.color);
}
}
/**
* <p>Gets the opacity used by the renderer to generate shadows.</p>
* <p>The opacity is comprised between 0.0f and 1.0f; 0.0f being fully
* transparent and 1.0f fully opaque.</p>
* @return this renderer"s shadow opacity
*/
public float getOpacity() {
return opacity;
}
/**
* <p>Sets the opacity used by the renderer to generate shadows.</p>
* <p>Consecutive calls to {@link #createShadow} will all use this opacity
* until it is set again.</p>
* <p>The opacity is comprised between 0.0f and 1.0f; 0.0f being fully
* transparent and 1.0f fully opaque. If you provide a value out of these
* boundaries, it will be restrained to the closest boundary.</p>
* @param shadowOpacity the generated shadows opacity
*/
public void setOpacity(final float shadowOpacity) {
float oldOpacity = this.opacity;
if (shadowOpacity < 0.0) {
this.opacity = 0.0f;
} else if (shadowOpacity > 1.0f) {
this.opacity = 1.0f;
} else {
this.opacity = shadowOpacity;
}
changeSupport.firePropertyChange(OPACITY_CHANGED_PROPERTY,
oldOpacity,
this.opacity);
}
/**
* <p>Gets the size in pixel used by the renderer to generate shadows.</p>
* @return this renderer"s shadow size
*/
public int getSize() {
return size;
}
/**
* <p>Sets the size, in pixels, used by the renderer to generate shadows.</p>
* <p>The size defines the blur radius applied to the shadow to create the
* fuzziness.</p>
* <p>There is virtually no limit to the size. The size cannot be negative.
* If you provide a negative value, the size will be 0 instead.</p>
* @param shadowSize the generated shadows size in pixels (fuzziness)
*/
public void setSize(final int shadowSize) {
int oldSize = this.size;
if (shadowSize < 0) {
this.size = 0;
} else {
this.size = shadowSize;
}
changeSupport.firePropertyChange(SIZE_CHANGED_PROPERTY,
new Integer(oldSize),
new Integer(this.size));
}
/**
* <p>Generates the shadow for a given picture and the current properties
* of the renderer.</p>
* <p>The generated image dimensions are computed as following:</p>
* <pre>
* width = imageWidth + 2 * shadowSize
* height = imageHeight + 2 * shadowSize
* </pre>
* @param image the picture from which the shadow must be cast
* @return the picture containing the shadow of <code>image</code>
*/
public BufferedImage createShadow(final BufferedImage image) {
// Written by Sesbastien Petrucci
int shadowSize = size * 2;
int srcWidth = image.getWidth();
int srcHeight = image.getHeight();
int dstWidth = srcWidth + shadowSize;
int dstHeight = srcHeight + shadowSize;
int left = size;
int right = shadowSize - left;
int yStop = dstHeight - right;
int shadowRgb = color.getRGB() & 0x00FFFFFF;
int[] aHistory = new int[shadowSize];
int historyIdx;
int aSum;
BufferedImage dst = new BufferedImage(dstWidth, dstHeight,
BufferedImage.TYPE_INT_ARGB);
int[] dstBuffer = new int[dstWidth * dstHeight];
int[] srcBuffer = new int[srcWidth * srcHeight];
GraphicsUtilities.getPixels(image, 0, 0, srcWidth, srcHeight, srcBuffer);
int lastPixelOffset = right * dstWidth;
float hSumDivider = 1.0f / shadowSize;
float vSumDivider = opacity / shadowSize;
int[] hSumLookup = new int[256 * shadowSize];
for (int i = 0; i < hSumLookup.length; i++) {
hSumLookup[i] = (int) (i * hSumDivider);
}
int[] vSumLookup = new int[256 * shadowSize];
for (int i = 0; i < vSumLookup.length; i++) {
vSumLookup[i] = (int) (i * vSumDivider);
}
int srcOffset;
// horizontal pass : extract the alpha mask from the source picture and
// blur it into the destination picture
for (int srcY = 0, dstOffset = left * dstWidth; srcY < srcHeight; srcY++) {
// first pixels are empty
for (historyIdx = 0; historyIdx < shadowSize; ) {
aHistory[historyIdx++] = 0;
}
aSum = 0;
historyIdx = 0;
srcOffset = srcY * srcWidth;
// compute the blur average with pixels from the source image
for (int srcX = 0; srcX < srcWidth; srcX++) {
int a = hSumLookup[aSum];
dstBuffer[dstOffset++] = a << 24; // store the alpha value only
// the shadow color will be added in the next pass
aSum -= aHistory[historyIdx]; // substract the oldest pixel from the sum
// extract the new pixel ...
a = srcBuffer[srcOffset + srcX] >>> 24;
aHistory[historyIdx] = a; // ... and store its value into history
aSum += a; // ... and add its value to the sum
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
// blur the end of the row - no new pixels to grab
for (int i = 0; i < shadowSize; i++) {
int a = hSumLookup[aSum];
dstBuffer[dstOffset++] = a << 24;
// substract the oldest pixel from the sum ... and nothing new to add !
aSum -= aHistory[historyIdx];
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
}
// vertical pass
for (int x = 0, bufferOffset = 0; x < dstWidth; x++, bufferOffset = x) {
aSum = 0;
// first pixels are empty
for (historyIdx = 0; historyIdx < left;) {
aHistory[historyIdx++] = 0;
}
// and then they come from the dstBuffer
for (int y = 0; y < right; y++, bufferOffset += dstWidth) {
int a = dstBuffer[bufferOffset] >>> 24; // extract alpha
aHistory[historyIdx++] = a; // store into history
aSum += a; // and add to sum
}
bufferOffset = x;
historyIdx = 0;
// compute the blur avera`ge with pixels from the previous pass
for (int y = 0; y < yStop; y++, bufferOffset += dstWidth) {
int a = vSumLookup[aSum];
dstBuffer[bufferOffset] = a << 24 | shadowRgb; // store alpha value + shadow color
aSum -= aHistory[historyIdx]; // substract the oldest pixel from the sum
a = dstBuffer[bufferOffset + lastPixelOffset] >>> 24; // extract the new pixel ...
aHistory[historyIdx] = a; // ... and store its value into history
aSum += a; // ... and add its value to the sum
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
// blur the end of the column - no pixels to grab anymore
for (int y = yStop; y < dstHeight; y++, bufferOffset += dstWidth) {
int a = vSumLookup[aSum];
dstBuffer[bufferOffset] = a << 24 | shadowRgb;
aSum -= aHistory[historyIdx]; // substract the oldest pixel from the sum
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
}
GraphicsUtilities.setPixels(dst, 0, 0, dstWidth, dstHeight, dstBuffer);
return dst;
}
}
