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annotate src/main/java/com/glavsoft/drawing/ColorDecoder.java @ 0:4689cc86d6cb

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create TreeViewer2 Repository
author Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
date Tue, 03 Jul 2012 13:20:49 +0900
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children 17b702648079
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1 // Copyright (C) 2010, 2011 GlavSoft LLC.
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2 // All rights reserved.
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3 //
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4 //-------------------------------------------------------------------------
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5 // This file is part of the TightVNC software. Please visit our Web site:
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6 //
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7 // http://www.tightvnc.com/
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8 //
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9 // This program is free software; you can redistribute it and/or modify
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10 // it under the terms of the GNU General Public License as published by
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11 // the Free Software Foundation; either version 2 of the License, or
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12 // (at your option) any later version.
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13 //
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14 // This program is distributed in the hope that it will be useful,
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15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 // GNU General Public License for more details.
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18 //
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19 // You should have received a copy of the GNU General Public License along
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20 // with this program; if not, write to the Free Software Foundation, Inc.,
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21 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 //-------------------------------------------------------------------------
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23 //
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24
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25 package com.glavsoft.drawing;
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26
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27 import com.glavsoft.exceptions.TransportException;
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28 import com.glavsoft.rfb.encoding.PixelFormat;
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29 import com.glavsoft.transport.Reader;
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30
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31 public class ColorDecoder {
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32 protected byte redShift;
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33 protected byte greenShift;
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34 protected byte blueShift;
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35 public short redMax;
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36 public short greenMax;
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37 public short blueMax;
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38 private final int bytesPerPixel;
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39 private final int bytesPerPixelSignificant;
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40 private final byte[] buff;
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41
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42 private int startShift;
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43 private int startShiftCompact;
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44 private int addShiftItem;
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45 private final boolean isTightSpecific;
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46
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47 public ColorDecoder(PixelFormat pf) {
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48 redShift = pf.redShift;
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49 greenShift = pf.greenShift;
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50 blueShift = pf.blueShift;
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51 redMax = pf.redMax;
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52 greenMax = pf.greenMax;
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53 blueMax = pf.blueMax;
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54 bytesPerPixel = pf.bitsPerPixel / 8;
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55 bytesPerPixelSignificant = 24 == pf.depth && 32 == pf.bitsPerPixel ? 3 : bytesPerPixel;
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56 buff = new byte[bytesPerPixel];
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57 if (0 == pf.bigEndianFlag) {
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58 startShift = 0;
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59 startShiftCompact = 0;
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60 addShiftItem = 8;
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61 } else {
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62 startShift = pf.bitsPerPixel - 8;
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63 startShiftCompact = Math.max(0, pf.depth - 8);
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64 addShiftItem = -8;
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65 }
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66 isTightSpecific = 4==bytesPerPixel && 3==bytesPerPixelSignificant &&
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67 255 == redMax && 255 == greenMax && 255 == blueMax;
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68 }
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69
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70 protected int readColor(Reader reader) throws TransportException {
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71 return getColor(reader.readBytes(buff, 0, bytesPerPixel), 0);
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72 }
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73
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74 protected int readCompactColor(Reader reader) throws TransportException {
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75 return getCompactColor(reader.readBytes(buff, 0, bytesPerPixelSignificant), 0);
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76 }
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77
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78 protected int readTightColor(Reader reader) throws TransportException {
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79 return getTightColor(reader.readBytes(buff, 0, bytesPerPixelSignificant), 0);
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80 }
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81
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82 protected int convertColor(int rawColor) {
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83 return 255 * (rawColor >> redShift & redMax) / redMax << 16 |
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84 255 * (rawColor >> greenShift & greenMax) / greenMax << 8 |
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85 255 * (rawColor >> blueShift & blueMax) / blueMax;
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86 }
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87
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88 public void fillRawComponents(byte[] comp, byte[] bytes, int offset) {
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89 int rawColor = getRawTightColor(bytes, offset);
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90 comp[0] = (byte) (rawColor >> redShift & redMax);
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91 comp[1] = (byte) (rawColor >> greenShift & greenMax);
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92 comp[2] = (byte) (rawColor >> blueShift & blueMax);
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93 }
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94
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95 protected int getTightColor(byte[] bytes, int offset) {
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96 return convertColor(getRawTightColor(bytes, offset));
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97 }
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98
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99 private int getRawTightColor(byte[] bytes, int offset) {
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100 if (isTightSpecific)
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101 return (bytes[offset++] & 0xff)<<16 |
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102 (bytes[offset++] & 0xff)<<8 |
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103 bytes[offset++] & 0xff;
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104 else
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105 return getRawColor(bytes, offset);
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106 }
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107
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108 protected int getColor(byte[] bytes, int offset) {
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109 return convertColor(getRawColor(bytes, offset));
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110 }
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111
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112 private int getRawColor(byte[] bytes, int offset) {
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113 int shift = startShift;
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114 int item = addShiftItem;
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115 int rawColor = (bytes[offset++] & 0xff)<<shift;
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116 for (int i=1; i<bytesPerPixel; ++i) {
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117 rawColor |= (bytes[offset++] & 0xff)<<(shift+=item);
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118 }
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119 return rawColor;
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120 }
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121
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122 protected int getCompactColor(byte[] bytes, int offset) {
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123 int shift = startShiftCompact;
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124 int item = addShiftItem;
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125 int rawColor = (bytes[offset++] & 0xff)<<shift;
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126 for (int i=1; i<bytesPerPixelSignificant; ++i) {
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127 rawColor |= (bytes[offset++] & 0xff)<<(shift+=item);
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128 }
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129 return convertColor(rawColor);
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130 }
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131
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132 }