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-/* AlphaComposite.java -- provides a context for performing alpha compositing
- Copyright (C) 2002, 2005, 2006 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 java.awt;
-
-import gnu.java.awt.java2d.AlphaCompositeContext;
-
-import java.awt.image.ColorModel;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-/**
- *
- * @author Eric Blake (ebb9@email.byu.edu)
- * @see Composite
- * @see CompositeContext
- * @since 1.3
- * @status updated to 1.4 except for createContext, needs documentation
- */
-public final class AlphaComposite implements Composite
-{
- /** Map Long to AlphaComposites. See getInstance for details. */
- private static final LinkedHashMap cache = new LinkedHashMap(11, 0.75f, true)
- {
- /** The largest the alpha composite cache can grow. */
- private static final int MAX_CACHE_SIZE = 2048;
-
- /** Prune stale entries. */
- protected boolean removeEldestEntry(Map.Entry eldest)
- {
- return size() > MAX_CACHE_SIZE;
- }
- };
-
- public static final int CLEAR = 1;
- public static final int SRC = 2;
- public static final int DST = 9;
- public static final int SRC_OVER = 3;
- public static final int DST_OVER = 4;
- public static final int SRC_IN = 5;
- public static final int DST_IN = 6;
- public static final int SRC_OUT = 7;
- public static final int DST_OUT = 8;
- public static final int SRC_ATOP = 10;
- public static final int DST_ATOP = 11;
- public static final int XOR = 12;
- public static final AlphaComposite Clear = getInstance(CLEAR);
- public static final AlphaComposite Src = getInstance(SRC);
- public static final AlphaComposite Dst = getInstance(DST);
- public static final AlphaComposite SrcOver = getInstance(SRC_OVER);
- public static final AlphaComposite DstOver = getInstance(DST_OVER);
- public static final AlphaComposite SrcIn = getInstance(SRC_IN);
- public static final AlphaComposite DstIn = getInstance(DST_IN);
- public static final AlphaComposite SrcOut = getInstance(SRC_OUT);
- public static final AlphaComposite DstOut = getInstance(DST_OUT);
- public static final AlphaComposite SrcAtop = getInstance(SRC_ATOP);
- public static final AlphaComposite DstAtop = getInstance(DST_ATOP);
- public static final AlphaComposite Xor = getInstance(XOR);
-
- private final int rule;
- private final float alpha;
- private AlphaComposite(int rule, float alpha)
- {
- this.rule = rule;
- this.alpha = alpha;
- }
-
- /**
- * Creates an AlphaComposite object with the specified rule.
- *
- * @param rule The compositing rule.
- *
- * @exception IllegalArgumentException If rule is not one of the following:
- * CLEAR, SRC, DST, SRC_OVER, DST_OVER, SRC_IN, DST_IN, SRC_OUT, DST_OUT,
- * SRC_ATOP, DST_ATOP, or XOR.
- */
- public static AlphaComposite getInstance(int rule)
- {
- return getInstance(rule, 1);
- }
-
- /**
- * Creates an AlphaComposite object with the specified rule and the constant
- * alpha to multiply with the alpha of the source. The source is multiplied
- * with the specified alpha before being composited with the destination.
- *
- * @param rule The compositing rule.
- *
- * @exception IllegalArgumentException If rule is not one of the following:
- * CLEAR, SRC, DST, SRC_OVER, DST_OVER, SRC_IN, DST_IN, SRC_OUT, DST_OUT,
- * SRC_ATOP, DST_ATOP, or XOR.
- */
- public static AlphaComposite getInstance(int rule, float alpha)
- {
- if (rule < CLEAR || rule > XOR || ! (alpha >= 0 && alpha <= 1))
- throw new IllegalArgumentException();
- // This long is guaranteed unique for all valid alpha composites.
- Long l = new Long(rule + Double.doubleToLongBits(alpha));
- AlphaComposite a = (AlphaComposite) cache.get(l);
- if (a == null)
- {
- a = new AlphaComposite(rule, alpha);
- cache.put(l, a);
- }
- return a;
- }
-
- /**
- * Creates a {@link CompositeContext} that can be used to perform
- * compositing operations according to this AlphaComposite settings.
- *
- * @param srcColorModel the color model of the source raster
- * @param dstColorModel the color model of the destination raster
- * @param hints the rendering hints to use
- *
- * @return a {@link CompositeContext} that can be used to perform
- * compositing operations according to this AlphaComposite settings
- */
- public CompositeContext createContext(ColorModel srcColorModel,
- ColorModel dstColorModel,
- RenderingHints hints)
- {
- return new AlphaCompositeContext(this, srcColorModel, dstColorModel);
- }
-
- /**
- * Return an <code>AlphaComposite</code> similar to <code>this</code>,
- * that uses the specified rule. If <code>rule</code> is the same as
- * <code>this.rule</code>, then <code>this</code> is returned.
- *
- * @since 1.6
- */
- public AlphaComposite derive(int rule)
- {
- if (this.rule == rule)
- return this;
- else
- return AlphaComposite.getInstance(rule, this.getAlpha());
- }
-
- /**
- * Return an <code>AlphaComposite</code> similar to <code>this</code>,
- * that uses the specified <code>alpha</code>.
- *
- * If <code>alph</code> is the same as <code>this.alpha</code>,
- * then <code>this</code> is returned.
- *
- * @since 1.6
- */
- public AlphaComposite derive(float alpha)
- {
- if (this.getAlpha() == alpha)
- return this;
- else
- return AlphaComposite.getInstance(this.getRule(), alpha);
- }
-
- public float getAlpha()
- {
- return alpha;
- }
-
- public int getRule()
- {
- return rule;
- }
-
- public int hashCode()
- {
- return 31 * Float.floatToIntBits(alpha) + rule;
- }
-
- public boolean equals(Object o)
- {
- if (! (o instanceof AlphaComposite))
- return false;
- AlphaComposite a = (AlphaComposite) o;
- return rule == a.rule && alpha == a.alpha;
- }
-} // class AlphaComposite