Mercurial > hg > Applications > TightVNC_orginal

annotate src/main/java/com/glavsoft/drawing/ColorDecoder.java @ 52:472a9bcacb21 draft default tip

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TightVNC 2.7.1.0
author you@cr.ie.u-ryukyu.ac.jp
date Wed, 07 Aug 2013 19:01:17 +0900
parents 4689cc86d6cb
children
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52
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1 // Copyright (C) 2010, 2011, 2012, 2013 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 public final int bytesPerPixel;
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39 public final int bytesPerCPixel;
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40 public final int bytesPerPixelTight;
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41 private final byte[] buff;
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42
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43 private int startShift;
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44 private int startShiftCompact;
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45 private int addShiftItem;
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46 private final boolean isTightSpecific;
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47
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48 public ColorDecoder(PixelFormat pf) {
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49 redShift = pf.redShift;
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50 greenShift = pf.greenShift;
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51 blueShift = pf.blueShift;
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52 redMax = pf.redMax;
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53 greenMax = pf.greenMax;
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54 blueMax = pf.blueMax;
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55 bytesPerPixel = pf.bitsPerPixel / 8;
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56 final long significant = redMax << redShift | greenMax << greenShift | blueMax << blueShift;
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57 bytesPerCPixel = pf.depth <= 24 // as in RFB
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58 // || 32 == pf.depth) // UltraVNC use this... :(
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59 && 32 == pf.bitsPerPixel
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60 && ((significant & 0x00ff000000L) == 0 || (significant & 0x000000ffL) == 0)
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61 ? 3
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62 : bytesPerPixel;
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63 bytesPerPixelTight = 24 == pf.depth && 32 == pf.bitsPerPixel ? 3 : bytesPerPixel;
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64 buff = new byte[bytesPerPixel];
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65 if (0 == pf.bigEndianFlag) {
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66 startShift = 0;
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67 startShiftCompact = 0;
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68 addShiftItem = 8;
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69 } else {
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70 startShift = pf.bitsPerPixel - 8;
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71 startShiftCompact = Math.max(0, pf.depth - 8);
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72 addShiftItem = -8;
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73 }
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74 isTightSpecific = 4==bytesPerPixel && 3==bytesPerPixelTight &&
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75 255 == redMax && 255 == greenMax && 255 == blueMax;
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76 }
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77
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78 protected int readColor(Reader reader) throws TransportException {
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79 return getColor(reader.readBytes(buff, 0, bytesPerPixel), 0);
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80 }
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81
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82 protected int readCompactColor(Reader reader) throws TransportException {
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83 return getCompactColor(reader.readBytes(buff, 0, bytesPerCPixel), 0);
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84 }
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85
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86 protected int readTightColor(Reader reader) throws TransportException {
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87 return getTightColor(reader.readBytes(buff, 0, bytesPerPixelTight), 0);
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88 }
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89
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90 protected int convertColor(int rawColor) {
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91 return 255 * (rawColor >> redShift & redMax) / redMax << 16 |
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92 255 * (rawColor >> greenShift & greenMax) / greenMax << 8 |
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93 255 * (rawColor >> blueShift & blueMax) / blueMax;
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94 }
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95
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96 public void fillRawComponents(byte[] comp, byte[] bytes, int offset) {
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97 int rawColor = getRawTightColor(bytes, offset);
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98 comp[0] = (byte) (rawColor >> redShift & redMax);
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99 comp[1] = (byte) (rawColor >> greenShift & greenMax);
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100 comp[2] = (byte) (rawColor >> blueShift & blueMax);
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101 }
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102
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103 public int getTightColor(byte[] bytes, int offset) {
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104 return convertColor(getRawTightColor(bytes, offset));
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105 }
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106
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107 private int getRawTightColor(byte[] bytes, int offset) {
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108 if (isTightSpecific)
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109 return (bytes[offset++] & 0xff)<<16 |
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110 (bytes[offset++] & 0xff)<<8 |
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111 bytes[offset] & 0xff;
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112 else
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113 return getRawColor(bytes, offset);
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114 }
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115
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116 protected int getColor(byte[] bytes, int offset) {
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117 return convertColor(getRawColor(bytes, offset));
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118 }
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119
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120 private int getRawColor(byte[] bytes, int offset) {
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121 int shift = startShift;
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122 int item = addShiftItem;
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123 int rawColor = (bytes[offset++] & 0xff)<<shift;
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124 for (int i=1; i<bytesPerPixel; ++i) {
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125 rawColor |= (bytes[offset++] & 0xff)<<(shift+=item);
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126 }
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127 return rawColor;
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128 }
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129
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130 protected int getCompactColor(byte[] bytes, int offset) {
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131 int shift = startShiftCompact;
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132 int item = addShiftItem;
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133 int rawColor = (bytes[offset++] & 0xff)<<shift;
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134 for (int i=1; i< bytesPerCPixel; ++i) {
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135 rawColor |= (bytes[offset++] & 0xff)<<(shift+=item);
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136 }
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137 return convertColor(rawColor);
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138 }
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139
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140 }