gnu.java.awt
Class BitwiseXORComposite
- Composite
A composite for emulating traditional bitwise XOR of pixel values.
Please note that this composite does
not implement the Porter-Duff
XOR operator, but an exclusive or of overlapping subpixel regions.
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.
The purpose of this composite is to support the
Graphics.setXORMode(Color) method in composite-aware graphics
implementations. Applications typically would use
setXORMode for drawing “highlights” such
as text selections or cursors by inverting colors temporarily and
then inverting them back.
A concrete
Graphics implementation may contain
the following code:
public void setXORMode(Color xorColor)
{
setComposite(new gnu.java.awt.BitwiseXORComposite(xorColor));
}
public void setPaintMode()
{
setComposite(java.awt.AlphaComposite.SrcOver);
}
protected Color | xorColor- The color whose RGB value is xor-ed with the values of each
pixel.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
xorColor
protected Color xorColor
The color whose RGB value is xor-ed with the values of each
pixel.
BitwiseXORComposite
public BitwiseXORComposite(Color xorColor)
Constructs a new composite for xor-ing the pixel value.
xorColor - the color whose pixel value will be bitwise
xor-ed with the source and destination pixels.
createContext
public CompositeContext createContext(ColorModel srcColorModel,
ColorModel dstColorModel,
RenderingHints hints) 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.
- createContext in interface Composite
srcColorModel - the color model of the source.dstColorModel - the color model of the destination.hints - hints for choosing between rendering alternatives.
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.