258 lines
9.3 KiB
Java
258 lines
9.3 KiB
Java
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/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hssf.record;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.poi.util.LittleEndian;
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/**
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* PaletteRecord - Supports custom palettes.
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* @author Andrew C. Oliver (acoliver at apache dot org)
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* @author Brian Sanders (bsanders at risklabs dot com) - custom palette editing
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* @version 2.0-pre
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*/
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public class PaletteRecord
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extends Record
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{
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public final static short sid = 0x92;
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/** The standard size of an XLS palette */
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public final static byte STANDARD_PALETTE_SIZE = (byte) 56;
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/** The byte index of the first color */
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public final static short FIRST_COLOR_INDEX = (short) 0x8;
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private short field_1_numcolors;
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private List field_2_colors;
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public PaletteRecord()
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{
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createDefaultPalette();
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}
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public PaletteRecord(RecordInputStream in)
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{
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field_1_numcolors = in.readShort();
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field_2_colors = new ArrayList(field_1_numcolors);
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for (int k = 0; k < field_1_numcolors; k++) {
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field_2_colors.add(new PColor(
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in.readByte(),
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in.readByte(),
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in.readByte()
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)
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);
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//Read unused byte.
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in.readByte();
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}
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}
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public String toString()
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{
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StringBuffer buffer = new StringBuffer();
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buffer.append("[PALETTE]\n");
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buffer.append(" numcolors = ").append(field_1_numcolors)
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.append('\n');
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for (int k = 0; k < field_1_numcolors; k++) {
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PColor c = (PColor) field_2_colors.get(k);
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buffer.append("* colornum = ").append(k)
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.append('\n');
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buffer.append(c.toString());
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buffer.append("/*colornum = ").append(k)
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.append('\n');
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}
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buffer.append("[/PALETTE]\n");
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return buffer.toString();
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}
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public int serialize(int offset, byte [] data)
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{
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LittleEndian.putShort(data, 0 + offset, sid);
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LittleEndian.putShort(data, 2 + offset, (short) (getRecordSize() - 4));
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LittleEndian.putShort(data, 4 + offset, field_1_numcolors);
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for (int k = 0; k < field_1_numcolors; k++) {
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PColor c = (PColor)field_2_colors.get(k);
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c.serialize(data, (6+offset+(k*4)));
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}
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return getRecordSize();
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}
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protected int getDataSize() {
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return 2 + (field_1_numcolors * 4);
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}
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public short getSid()
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{
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return sid;
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}
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/**
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* Returns the color value at a given index
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*
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* @return the RGB triplet for the color, or null if the specified index
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* does not exist
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*/
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public byte[] getColor(short byteIndex)
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{
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int i = byteIndex - FIRST_COLOR_INDEX;
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if (i < 0 || i >= field_2_colors.size())
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{
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return null;
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}
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PColor color = (PColor) field_2_colors.get(i);
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return new byte[] { color.red, color.green, color.blue };
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}
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/**
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* Sets the color value at a given index
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*
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* If the given index is greater than the current last color index,
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* then black is inserted at every index required to make the palette continuous.
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*
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* @param byteIndex the index to set; if this index is less than 0x8 or greater than
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* 0x40, then no modification is made
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*/
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public void setColor(short byteIndex, byte red, byte green, byte blue)
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{
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int i = byteIndex - FIRST_COLOR_INDEX;
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if (i < 0 || i >= STANDARD_PALETTE_SIZE)
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{
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return;
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}
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while (field_2_colors.size() <= i)
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{
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field_2_colors.add(new PColor((byte) 0, (byte) 0, (byte) 0));
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}
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PColor custColor = new PColor(red, green, blue);
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field_2_colors.set(i, custColor);
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}
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/**
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* Creates the default palette as PaletteRecord binary data
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*
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* @see org.apache.poi.hssf.model.Workbook#createPalette
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*/
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private void createDefaultPalette()
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{
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field_1_numcolors = STANDARD_PALETTE_SIZE;
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field_2_colors = new ArrayList(field_1_numcolors);
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byte[] palette = new byte[]
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{
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(byte) 0, (byte) 0, (byte) 0, (byte) 0, //color 0...
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(byte) 255, (byte) 255, (byte) 255, (byte) 0,
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(byte) 255, (byte) 0, (byte) 0, (byte) 0,
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(byte) 0, (byte) 255, (byte) 0, (byte) 0,
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(byte) 0, (byte) 0, (byte) 255, (byte) 0,
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(byte) 255, (byte) 255, (byte) 0, (byte) 0,
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(byte) 255, (byte) 0, (byte) 255, (byte) 0,
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(byte) 0, (byte) 255, (byte) 255, (byte) 0,
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(byte) 128, (byte) 0, (byte) 0, (byte) 0,
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(byte) 0, (byte) 128, (byte) 0, (byte) 0,
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(byte) 0, (byte) 0, (byte) 128, (byte) 0,
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(byte) 128, (byte) 128, (byte) 0, (byte) 0,
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(byte) 128, (byte) 0, (byte) 128, (byte) 0,
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(byte) 0, (byte) 128, (byte) 128, (byte) 0,
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(byte) 192, (byte) 192, (byte) 192, (byte) 0,
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(byte) 128, (byte) 128, (byte) 128, (byte) 0,
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(byte) 153, (byte) 153, (byte) 255, (byte) 0,
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(byte) 153, (byte) 51, (byte) 102, (byte) 0,
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(byte) 255, (byte) 255, (byte) 204, (byte) 0,
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(byte) 204, (byte) 255, (byte) 255, (byte) 0,
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(byte) 102, (byte) 0, (byte) 102, (byte) 0,
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(byte) 255, (byte) 128, (byte) 128, (byte) 0,
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(byte) 0, (byte) 102, (byte) 204, (byte) 0,
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(byte) 204, (byte) 204, (byte) 255, (byte) 0,
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(byte) 0, (byte) 0, (byte) 128, (byte) 0,
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(byte) 255, (byte) 0, (byte) 255, (byte) 0,
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(byte) 255, (byte) 255, (byte) 0, (byte) 0,
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(byte) 0, (byte) 255, (byte) 255, (byte) 0,
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(byte) 128, (byte) 0, (byte) 128, (byte) 0,
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(byte) 128, (byte) 0, (byte) 0, (byte) 0,
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(byte) 0, (byte) 128, (byte) 128, (byte) 0,
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(byte) 0, (byte) 0, (byte) 255, (byte) 0,
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(byte) 0, (byte) 204, (byte) 255, (byte) 0,
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(byte) 204, (byte) 255, (byte) 255, (byte) 0,
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(byte) 204, (byte) 255, (byte) 204, (byte) 0,
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(byte) 255, (byte) 255, (byte) 153, (byte) 0,
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(byte) 153, (byte) 204, (byte) 255, (byte) 0,
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(byte) 255, (byte) 153, (byte) 204, (byte) 0,
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(byte) 204, (byte) 153, (byte) 255, (byte) 0,
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(byte) 255, (byte) 204, (byte) 153, (byte) 0,
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(byte) 51, (byte) 102, (byte) 255, (byte) 0,
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(byte) 51, (byte) 204, (byte) 204, (byte) 0,
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(byte) 153, (byte) 204, (byte) 0, (byte) 0,
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(byte) 255, (byte) 204, (byte) 0, (byte) 0,
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(byte) 255, (byte) 153, (byte) 0, (byte) 0,
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(byte) 255, (byte) 102, (byte) 0, (byte) 0,
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(byte) 102, (byte) 102, (byte) 153, (byte) 0,
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(byte) 150, (byte) 150, (byte) 150, (byte) 0,
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(byte) 0, (byte) 51, (byte) 102, (byte) 0,
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(byte) 51, (byte) 153, (byte) 102, (byte) 0,
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(byte) 0, (byte) 51, (byte) 0, (byte) 0,
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(byte) 51, (byte) 51, (byte) 0, (byte) 0,
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(byte) 153, (byte) 51, (byte) 0, (byte) 0,
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(byte) 153, (byte) 51, (byte) 102, (byte) 0,
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(byte) 51, (byte) 51, (byte) 153, (byte) 0,
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(byte) 51, (byte) 51, (byte) 51, (byte) 0
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};
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for (int k = 0; k < field_1_numcolors; k++) {
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field_2_colors.add(new PColor(
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palette[k*4],
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palette[k*4+1],
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palette[k*4+2]
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)
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);
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}
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}
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}
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/**
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* PColor - element in the list of colors - consider it a "struct"
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*/
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class PColor {
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public byte red;
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public byte green;
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public byte blue;
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public PColor(byte red, byte green, byte blue) {
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this.red=red;
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this.green=green;
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this.blue=blue;
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}
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public void serialize(byte[] data, int offset) {
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data[offset + 0] = red;
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data[offset + 1] = green;
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data[offset + 2] = blue;
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data[offset + 3] = 0;
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}
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public String toString() {
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StringBuffer buffer = new StringBuffer();
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buffer.append(" red = ").append(red & 0xff).append('\n');
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buffer.append(" green = ").append(green & 0xff).append('\n');
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buffer.append(" blue = ").append(blue & 0xff).append('\n');
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return buffer.toString();
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}
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}
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