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1 files changed, 177 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/image/ShortLookupTable.java b/libjava/classpath/java/awt/image/ShortLookupTable.java
new file mode 100644
index 000000000..3e276fe9f
--- /dev/null
+++ b/libjava/classpath/java/awt/image/ShortLookupTable.java
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+/* ShortLookupTable.java -- Java class for a pixel translation table.
+   Copyright (C) 2004, 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.image;
+
+/**
+ * ShortLookupTable represents translation arrays for pixel values.  It wraps
+ * one or more data arrays for each layer (or component) in an image, such as
+ * Alpha, R, G, and B.  When doing translation, the offset is subtracted from
+ * the pixel values to allow a subset of an array to be used.
+ *
+ * @author Jerry Quinn (jlquinn@optonline.net)
+ * @version 1.0
+ */
+public class ShortLookupTable extends LookupTable
+{
+  // Array of translation tables.
+  private short data[][];
+
+  /**
+   * Creates a new <code>ShortLookupTable</code> instance.
+   *
+   * Offset is subtracted from pixel values when looking up in the translation
+   * tables.  If data.length is one, the same table is applied to all pixel
+   * components.
+   *
+   * @param offset Offset to be subtracted.
+   * @param data Array of lookup tables.
+   * @exception IllegalArgumentException if offset &lt; 0 or data.length &lt; 1.
+   */
+  public ShortLookupTable(int offset, short[][] data)
+    throws IllegalArgumentException
+  {
+    super(offset, data.length);
+
+    // tests show that Sun's implementation creates a new array to store the
+    // references from the incoming 'data' array - not sure why, but we'll
+    // match that behaviour just in case it matters...
+    this.data = new short[data.length][];
+    for (int i = 0; i < data.length; i++)
+      this.data[i] = data[i];
+  }
+
+  /**
+   * Creates a new <code>ShortLookupTable</code> instance.
+   *
+   * Offset is subtracted from pixel values when looking up in the translation
+   * table.  The same table is applied to all pixel components.
+   *
+   * @param offset Offset to be subtracted.
+   * @param data Lookup table for all components (<code>null</code> not
+   *     permitted).
+   * @exception IllegalArgumentException if offset &lt; 0.
+   */
+  public ShortLookupTable(int offset, short[] data)
+    throws IllegalArgumentException
+  {
+    super(offset, 1);
+    if (data == null)
+      throw new NullPointerException("Null 'data' argument.");
+    this.data = new short[][] {data};
+  }
+
+  /**
+   * Return the lookup tables.  This is a reference to the actual table, so
+   * modifying the contents of the returned array will modify the lookup table.
+   *
+   * @return The lookup table.
+   */
+  public final short[][] getTable()
+  {
+    return data;
+  }
+
+  /**
+   * Return translated values for a pixel.
+   *
+   * For each value in the pixel src, use the value minus offset as an index
+   * in the component array and copy the value there to the output for the
+   * component.  If dest is null, the output is a new array, otherwise the
+   * translated values are written to dest.  Dest can be the same array as
+   * src.
+   *
+   * For example, if the pixel src is [2, 4, 3], and offset is 1, the output
+   * is [comp1[1], comp2[3], comp3[2]], where comp1, comp2, and comp3 are the
+   * translation arrays.
+   *
+   * @param src Component values of a pixel.
+   * @param dst Destination array for values, or null.
+   * @return Translated values for the pixel.
+   */
+  public int[] lookupPixel(int[] src, int[] dst)
+    throws ArrayIndexOutOfBoundsException
+  {
+    if (dst == null)
+      dst = new int[src.length];
+
+    if (data.length == 1)
+      for (int i = 0; i < src.length; i++)
+        dst[i] = data[0][src[i] - offset];
+    else
+      for (int i = 0; i < src.length; i++)
+        dst[i] = data[i][src[i] - offset];
+
+    return dst;
+  }
+
+  /**
+   * Return translated values for a pixel.
+   *
+   * For each value in the pixel src, use the value minus offset as an index
+   * in the component array and copy the value there to the output for the
+   * component.  If dest is null, the output is a new array, otherwise the
+   * translated values are written to dest.  Dest can be the same array as
+   * src.
+   *
+   * For example, if the pixel src is [2, 4, 3], and offset is 1, the output
+   * is [comp1[1], comp2[3], comp3[2]], where comp1, comp2, and comp3 are the
+   * translation arrays.
+   *
+   * @param src Component values of a pixel.
+   * @param dst Destination array for values, or null.
+   * @return Translated values for the pixel.
+   *
+   */
+  public short[] lookupPixel(short[] src, short[] dst)
+    throws ArrayIndexOutOfBoundsException
+  {
+    if (dst == null)
+      dst = new short[src.length];
+
+    if (data.length == 1)
+      for (int i = 0; i < src.length; i++)
+        dst[i] = data[0][((int) src[i]) - offset];
+    else
+      for (int i = 0; i < src.length; i++)
+        dst[i] = data[i][((int) src[i]) - offset];
+
+    return dst;
+
+  }
+}