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Diffstat (limited to 'libjava/classpath/gnu/java/awt/BitwiseXORComposite.java')
| -rw-r--r-- | libjava/classpath/gnu/java/awt/BitwiseXORComposite.java | 295 |
1 files changed, 0 insertions, 295 deletions
diff --git a/libjava/classpath/gnu/java/awt/BitwiseXORComposite.java b/libjava/classpath/gnu/java/awt/BitwiseXORComposite.java deleted file mode 100644 index e19b27f..0000000 --- a/libjava/classpath/gnu/java/awt/BitwiseXORComposite.java +++ /dev/null @@ -1,295 +0,0 @@ -/* BitwiseXORComposite.java -- Composite for emulating old-style XOR. - Copyright (C) 2003, 2004 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - - -package gnu.java.awt; - -import java.awt.Color; -import java.awt.Composite; -import java.awt.CompositeContext; -import java.awt.Rectangle; -import java.awt.RenderingHints; -import java.awt.image.ColorModel; -import java.awt.image.DataBuffer; -import java.awt.image.Raster; -import java.awt.image.WritableRaster; - - -/** - * A composite for emulating traditional bitwise XOR of pixel values. - * Please note that this composite does <i>not</i> implement the Porter-Duff - * XOR operator, but an exclusive or of overlapping subpixel regions. - * - * <p><img src="doc-files/BitwiseXORComposite-1.png" width="545" - * height="138" alt="A screen shot of BitwiseXORComposite in action" - * /> - * - * <p>The above screen shot shows the result of applying six different - * BitwiseXORComposites. They were constructed with the colors - * white, blue, black, orange, green, and brown, respectively. Each - * composite was used to paint a fully white rectangle on top of the - * blue bar in the background. - * - * <p>The purpose of this composite is to support the {@link - * Graphics#setXORMode(Color)} method in composite-aware graphics - * implementations. Applications typically would use - * <code>setXORMode</code> for drawing “highlights” such - * as text selections or cursors by inverting colors temporarily and - * then inverting them back. - * - * <p>A concrete <code>Graphics</code> implementation may contain - * the following code: - * - * <p><pre> public void setXORMode(Color xorColor) - * { - * setComposite(new gnu.java.awt.BitwiseXORComposite(xorColor)); - * } - * - * public void setPaintMode() - * { - * setComposite(java.awt.AlphaComposite.SrcOver); - * }</pre> - * - * @author Graydon Hoare (graydon@redhat.com) - * @author Sascha Brawer (brawer@dandelis.ch) - */ -public class BitwiseXORComposite - implements Composite -{ - /** - * The color whose RGB value is xor-ed with the values of each - * pixel. - */ - protected Color xorColor; - - - /** - * Constructs a new composite for xor-ing the pixel value. - * - * @param xorColor the color whose pixel value will be bitwise - * xor-ed with the source and destination pixels. - */ - public BitwiseXORComposite(Color xorColor) - { - this.xorColor = xorColor; - } - - - /** - * Creates a context object for performing the compositing - * operation. Several contexts may co-exist for one composite; each - * context may simultaneously be called from concurrent threads. - * - * @param srcColorModel the color model of the source. - * @param dstColorModel the color model of the destination. - * @param hints hints for choosing between rendering alternatives. - */ - public CompositeContext createContext(ColorModel srcColorModel, - ColorModel dstColorModel, - RenderingHints hints) - { - if (IntContext.isSupported(srcColorModel, dstColorModel, hints)) - return new IntContext(srcColorModel, xorColor); - - return new GeneralContext(srcColorModel, dstColorModel, xorColor); - } - - - /** - * A fallback CompositeContext that performs bitwise XOR of pixel - * values with the pixel value of the specified <code>xorColor</code>. - * - * <p>Applying this CompositeContext on a 1024x1024 BufferedImage of - * <code>TYPE_INT_RGB</code> took 611 ms on a lightly loaded 2.4 GHz - * Intel Pentium 4 CPU running Sun J2SE 1.4.1_01 on GNU/Linux - * 2.4.20. The timing is the average of ten runs on the same - * BufferedImage. Since the measurements were taken with {@link - * System#currentTimeMillis()}, they are rather inaccurate. - * - * @author Graydon Hoare (graydon@redhat.com) - */ - private static class GeneralContext - implements CompositeContext - { - ColorModel srcColorModel; - ColorModel dstColorModel; - Color xorColor; - - public GeneralContext(ColorModel srcColorModel, - ColorModel dstColorModel, - Color xorColor) - { - this.srcColorModel = srcColorModel; - this.dstColorModel = dstColorModel; - this.xorColor = xorColor; - } - - - public void compose(Raster src, Raster dstIn, WritableRaster dstOut) - { - Rectangle srcRect = src.getBounds(); - Rectangle dstInRect = dstIn.getBounds(); - Rectangle dstOutRect = dstOut.getBounds(); - - int xp = xorColor.getRGB(); - int w = Math.min(Math.min(srcRect.width, dstOutRect.width), - dstInRect.width); - int h = Math.min(Math.min(srcRect.height, dstOutRect.height), - dstInRect.height); - - Object srcPix = null, dstPix = null, rpPix = null; - - // Re-using the rpPix object saved 1-2% of execution time in - // the 1024x1024 pixel benchmark. - - for (int y = 0; y < h; y++) - { - for (int x = 0; x < w; x++) - { - srcPix = src.getDataElements(x + srcRect.x, y + srcRect.y, srcPix); - dstPix = dstIn.getDataElements(x + dstInRect.x, y + dstInRect.y, - dstPix); - int sp = srcColorModel.getRGB(srcPix); - int dp = dstColorModel.getRGB(dstPix); - int rp = sp ^ xp ^ dp; - dstOut.setDataElements(x + dstOutRect.x, y + dstOutRect.y, - dstColorModel.getDataElements(rp, rpPix)); - } - } - } - - - /** - * Disposes any cached resources. The default implementation does - * nothing because no resources are cached. - */ - public void dispose() - { - } - } - - - /** - * An optimized CompositeContext that performs bitwise XOR of - * <code>int</code> pixel values with the pixel value of a specified - * <code>xorColor</code>. This CompositeContext working only for - * rasters whose transfer format is {@link DataBuffer#TYPE_INT}. - * - * <p>Applying this CompositeContext on a 1024x1024 BufferedImage of - * <code>TYPE_INT_RGB</code> took 69 ms on a lightly loaded 2.4 GHz - * Intel Pentium 4 CPU running Sun J2SE 1.4.1_01 on GNU/Linux - * 2.4.20. The timing is the average of ten runs on the same - * BufferedImage. Since the measurements were taken with {@link - * System#currentTimeMillis()}, they are rather inaccurate. - * - * @author Sascha Brawer (brawer@dandelis.ch) - */ - private static class IntContext - extends GeneralContext - { - public IntContext(ColorModel colorModel, Color xorColor) - { - super(colorModel, colorModel, xorColor); - } - - - public void compose(Raster src, Raster dstIn, - WritableRaster dstOut) - { - int aX, bX, dstX, aY, bY, dstY, width, height; - int xorPixel; - int[] srcLine, dstLine; - - aX = src.getMinX(); - aY = src.getMinY(); - bX = dstIn.getMinX(); - bY = dstIn.getMinY(); - dstX = dstOut.getMinX(); - dstY = dstOut.getMinY(); - width = Math.min(Math.min(src.getWidth(), dstIn.getWidth()), - dstOut.getWidth()); - height = Math.min(Math.min(src.getHeight(), dstIn.getHeight()), - dstOut.getHeight()); - if ((width < 1) || (height < 1)) - return; - - srcLine = new int[width]; - dstLine = new int[width]; - - /* We need an int[] array with at least one element here; - * srcLine is as good as any other. - */ - srcColorModel.getDataElements(this.xorColor.getRGB(), srcLine); - xorPixel = srcLine[0]; - - for (int y = 0; y < height; y++) - { - src.getDataElements(aX, y + aY, width, 1, srcLine); - dstIn.getDataElements(bX, y + bY, width, 1, dstLine); - - for (int x = 0; x < width; x++) - dstLine[x] ^= srcLine[x] ^ xorPixel; - - dstOut.setDataElements(dstX, y + dstY, width, 1, dstLine); - } - } - - - /** - * Determines whether an instance of this CompositeContext would - * be able to process the specified color models. - */ - public static boolean isSupported(ColorModel srcColorModel, - ColorModel dstColorModel, - RenderingHints hints) - { - // FIXME: It would be good if someone could review these checks. - // They probably need to be more restrictive. - - int transferType; - - transferType = srcColorModel.getTransferType(); - if (transferType != dstColorModel.getTransferType()) - return false; - - if (transferType != DataBuffer.TYPE_INT) - return false; - - return true; - } - } -} |