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From-SVN: r102074

1 files changed, 167 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/AlphaComposite.java b/libjava/classpath/java/awt/AlphaComposite.java
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+/* AlphaComposite.java -- provides a context for performing alpha compositing
+   Copyright (C) 2002, 2005  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 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)
+    {	// XXX - FIXME Use Map.Entry, not just Entry as gcj 3.1 workaround.
+      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;
+  }
+  public CompositeContext createContext(ColorModel srcColorModel,
+                                        ColorModel dstColorModel,
+                                        RenderingHints hints)
+  {
+    // XXX Implement. Sun uses undocumented implementation class
+    // sun.java2d.SunCompositeContext.
+    throw new Error("not implemented");
+  }
+  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