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Diffstat (limited to 'src/jogl/classes/com/jogamp/opengl/util/awt/ImageUtil.java')
-rwxr-xr-x | src/jogl/classes/com/jogamp/opengl/util/awt/ImageUtil.java | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/util/awt/ImageUtil.java b/src/jogl/classes/com/jogamp/opengl/util/awt/ImageUtil.java new file mode 100755 index 000000000..a3139b16a --- /dev/null +++ b/src/jogl/classes/com/jogamp/opengl/util/awt/ImageUtil.java @@ -0,0 +1,127 @@ +/* + * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * - Redistribution of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * - Redistribution 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 Sun Microsystems, Inc. or the names of + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * This software is provided "AS IS," without a warranty of any kind. ALL + * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, + * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN + * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR + * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR + * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR + * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR + * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE + * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, + * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF + * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. + * + * You acknowledge that this software is not designed or intended for use + * in the design, construction, operation or maintenance of any nuclear + * facility. + * + * Sun gratefully acknowledges that this software was originally authored + * and developed by Kenneth Bradley Russell and Christopher John Kline. + */ + +package com.jogamp.opengl.util.awt; + +import java.awt.*; +import java.awt.image.*; + +/** Utilities for dealing with images. */ + +public class ImageUtil { + private ImageUtil() {} + + /** Flips the supplied BufferedImage vertically. This is often a + necessary conversion step to display a Java2D image correctly + with OpenGL and vice versa. */ + public static void flipImageVertically(BufferedImage image) { + WritableRaster raster = image.getRaster(); + Object scanline1 = null; + Object scanline2 = null; + + for (int i = 0; i < image.getHeight() / 2; i++) { + scanline1 = raster.getDataElements(0, i, image.getWidth(), 1, scanline1); + scanline2 = raster.getDataElements(0, image.getHeight() - i - 1, image.getWidth(), 1, scanline2); + raster.setDataElements(0, i, image.getWidth(), 1, scanline2); + raster.setDataElements(0, image.getHeight() - i - 1, image.getWidth(), 1, scanline1); + } + } + + /** + * Creates a <code>BufferedImage</code> with a pixel format compatible with the graphics + * environment. The returned image can thus benefit from hardware accelerated operations + * in Java2D API. + * + * @param width The width of the image to be created + * @param height The height of the image to be created + * + * @return A instance of <code>BufferedImage</code> with a type compatible with the graphics card. + */ + public static BufferedImage createCompatibleImage(int width, int height) { + GraphicsConfiguration configuration = + GraphicsEnvironment.getLocalGraphicsEnvironment(). + getDefaultScreenDevice().getDefaultConfiguration(); + return configuration.createCompatibleImage(width, height); + } + + /** + * Creates a thumbnail from an image. A thumbnail is a scaled down version of the original picture. + * This method will retain the width to height ratio of the original picture and return a new + * instance of <code>BufferedImage</code>. The original picture is not modified. + * + * @param image The original image to sample down + * @param thumbWidth The width of the thumbnail to be created + * + * @throws IllegalArgumentException If thumbWidth is greater than image.getWidth() + * + * @return A thumbnail with the requested width or the original picture if thumbWidth = image.getWidth() + */ + public static BufferedImage createThumbnail(BufferedImage image, int thumbWidth) { + // Thanks to Romain Guy for this utility + if (thumbWidth > image.getWidth()) { + throw new IllegalArgumentException("Thumbnail width must be greater than image width"); + } + + if (thumbWidth == image.getWidth()) { + return image; + } + + float ratio = (float) image.getWidth() / (float) image.getHeight(); + int width = image.getWidth(); + BufferedImage thumb = image; + + do { + width /= 2; + if (width < thumbWidth) { + width = thumbWidth; + } + + BufferedImage temp = createCompatibleImage(width, (int) (width / ratio)); + 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 != thumbWidth); + + return thumb; + } + +} |