245 lines
7.8 KiB
Java
245 lines
7.8 KiB
Java
/* ====================================================================
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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.LittleEndianOutput;
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/**
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* PaletteRecord (0x0092) - 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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*
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*/
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public final class PaletteRecord extends StandardRecord {
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public final static short sid = 0x0092;
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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 final List<PColor> _colors;
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public PaletteRecord() {
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PColor[] defaultPalette = createDefaultPalette();
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_colors = new ArrayList<PColor>(defaultPalette.length);
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for (PColor element : defaultPalette) {
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_colors.add(element);
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}
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}
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public PaletteRecord(RecordInputStream in) {
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int field_1_numcolors = in.readShort();
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_colors = new ArrayList<PColor>(field_1_numcolors);
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for (int k = 0; k < field_1_numcolors; k++) {
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_colors.add(new PColor(in));
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}
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}
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@Override
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public String toString() {
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StringBuffer buffer = new StringBuffer();
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buffer.append("[PALETTE]\n");
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buffer.append(" numcolors = ").append(_colors.size()).append('\n');
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for (int i = 0; i < _colors.size(); i++) {
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PColor c = _colors.get(i);
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buffer.append("* colornum = ").append(i).append('\n');
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buffer.append(c.toString());
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buffer.append("/*colornum = ").append(i).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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@Override
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public void serialize(LittleEndianOutput out) {
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out.writeShort(_colors.size());
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for (int i = 0; i < _colors.size(); i++) {
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_colors.get(i).serialize(out);
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}
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}
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@Override
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protected int getDataSize() {
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return 2 + _colors.size() * PColor.ENCODED_SIZE;
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}
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@Override
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public short getSid() {
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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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* @param byteIndex palette index, must be >= 0x8
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*
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* @return the RGB triplet for the color, or <code>null</code> if the specified index
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* does not exist
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*/
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public byte[] getColor(int byteIndex) {
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int i = byteIndex - FIRST_COLOR_INDEX;
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if (i < 0 || i >= _colors.size()) {
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return null;
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}
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return _colors.get(i).getTriplet();
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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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* @param red the red color part
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* @param green the green color part
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* @param blue the blue color part
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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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// may need to grow - fill intervening palette entries with black
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while (_colors.size() <= i) {
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_colors.add(new PColor(0, 0, 0));
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}
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PColor custColor = new PColor(red, green, blue);
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_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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private static PColor[] createDefaultPalette()
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{
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return new PColor[] {
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pc(0, 0, 0),
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pc(255, 255, 255),
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pc(255, 0, 0),
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pc(0, 255, 0),
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pc(0, 0, 255),
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pc(255, 255, 0),
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pc(255, 0, 255),
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pc(0, 255, 255),
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pc(128, 0, 0),
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pc(0, 128, 0),
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pc(0, 0, 128),
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pc(128, 128, 0),
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pc(128, 0, 128),
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pc(0, 128, 128),
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pc(192, 192, 192),
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pc(128, 128, 128),
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pc(153, 153, 255),
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pc(153, 51, 102),
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pc(255, 255, 204),
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pc(204, 255, 255),
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pc(102, 0, 102),
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pc(255, 128, 128),
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pc(0, 102, 204),
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pc(204, 204, 255),
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pc(0, 0, 128),
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pc(255, 0, 255),
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pc(255, 255, 0),
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pc(0, 255, 255),
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pc(128, 0, 128),
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pc(128, 0, 0),
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pc(0, 128, 128),
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pc(0, 0, 255),
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pc(0, 204, 255),
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pc(204, 255, 255),
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pc(204, 255, 204),
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pc(255, 255, 153),
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pc(153, 204, 255),
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pc(255, 153, 204),
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pc(204, 153, 255),
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pc(255, 204, 153),
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pc(51, 102, 255),
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pc(51, 204, 204),
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pc(153, 204, 0),
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pc(255, 204, 0),
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pc(255, 153, 0),
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pc(255, 102, 0),
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pc(102, 102, 153),
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pc(150, 150, 150),
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pc(0, 51, 102),
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pc(51, 153, 102),
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pc(0, 51, 0),
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pc(51, 51, 0),
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pc(153, 51, 0),
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pc(153, 51, 102),
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pc(51, 51, 153),
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pc(51, 51, 51),
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};
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}
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private static PColor pc(int r, int g, int b) {
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return new PColor(r, g, b);
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}
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/**
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* PColor - element in the list of colors
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*/
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private static final class PColor {
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public static final short ENCODED_SIZE = 4;
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private final int _red;
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private final int _green;
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private final int _blue;
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public PColor(int red, int green, int blue) {
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_red = red;
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_green = green;
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_blue = blue;
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}
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public byte[] getTriplet() {
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return new byte[] { (byte) _red, (byte) _green, (byte) _blue };
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}
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public PColor(RecordInputStream in) {
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_red = in.readByte();
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_green = in.readByte();
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_blue = in.readByte();
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in.readByte(); // unused
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}
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public void serialize(LittleEndianOutput out) {
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out.writeByte(_red);
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out.writeByte(_green);
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out.writeByte(_blue);
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out.writeByte(0);
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}
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@Override
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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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}
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