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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/ShortLookupTable.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/ShortLookupTable.java')
-rw-r--r-- | libjava/classpath/java/awt/image/ShortLookupTable.java | 177 |
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 @@ -0,0 +1,177 @@ +/* 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 < 0 or data.length < 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 < 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; + + } +} |