Mercurial > hg > Applications > TightVNC_orginal

annotate src/main/java/com/glavsoft/rfb/encoding/decoder/TightDecoder.java @ 30:0c08cdc4b572

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Create AbstractRenderer.java and Renderer change to Interface
author one
date Sat, 01 Sep 2012 20:33:48 +0900
parents 4689cc86d6cb
children
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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.rfb.encoding.decoder;
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26
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27 import java.util.logging.Logger;
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28 import java.util.zip.DataFormatException;
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29 import java.util.zip.Inflater;
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31 import com.glavsoft.drawing.ColorDecoder;
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32 import com.glavsoft.drawing.Renderer;
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33 import com.glavsoft.exceptions.TransportException;
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34 import com.glavsoft.transport.Reader;
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35
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36 /**
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37 * Tight protocol extention decoder
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38 */
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39 public class TightDecoder extends Decoder {
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40 private static Logger logger = Logger.getLogger("com.glavsoft.rfb.encoding.decoder");
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41
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42 private static final int FILL_TYPE = 0x08;
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43 private static final int JPEG_TYPE = 0x09;
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44
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45 private static final int FILTER_ID_MASK = 0x40;
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46 private static final int STREAM_ID_MASK = 0x30;
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47
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48 private static final int BASIC_FILTER = 0x00;
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49 private static final int PALETTE_FILTER = 0x01;
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50 private static final int GRADIENT_FILTER = 0x02;
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51 private static final int MIN_SIZE_TO_COMPRESS = 12;
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52
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53 static final int DECODERS_NUM = 4;
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54 Inflater[] decoders;
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55
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56 private int decoderId;
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57
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58 final static int tightZlibBufferSize = 512;
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59
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60 public TightDecoder() {
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61 reset();
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62 }
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63
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64 @Override
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65 public void decode(Reader reader, Renderer renderer,
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66 FramebufferUpdateRectangle rect) throws TransportException {
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67 int bytesPerPixel = renderer.getBytesPerPixel();
0
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68
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69 /**
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70 * bits
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71 * 7 - FILL or JPEG type
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72 * 6 - filter presence flag
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73 * 5, 4 - decoder to use when Basic type (bit 7 not set)
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74 * or
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75 * 4 - JPEG type when set bit 7
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76 * 3 - reset decoder #3
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77 * 2 - reset decoder #2
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78 * 1 - reset decoder #1
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79 * 0 - reset decoder #0
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80 */
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81 int compControl = reader.readUInt8();
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82 resetDecoders(compControl);
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83
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84 int compType = compControl >> 4 & 0x0F;
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85 switch (compType) {
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86 case FILL_TYPE:
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87 int color = renderer.readTightPixelColor(reader);
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88 renderer.fillRect(color, rect);
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89 break;
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90 case JPEG_TYPE:
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91 if (bytesPerPixel != 3) {
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92 // throw new EncodingException(
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93 // "Tight doesn't support JPEG subencoding while depth not equal to 24bpp is used");
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94 }
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95 processJpegType(reader, renderer, rect);
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96 break;
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97 default:
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98 if (compType > JPEG_TYPE) {
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99 // throw new EncodingException(
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100 // "Compression control byte is incorrect!");
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101 } else {
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102 processBasicType(compControl, reader, renderer, rect);
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103 }
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104 }
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105 }
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106
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107 private void processBasicType(int compControl, Reader reader,
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108 Renderer renderer, FramebufferUpdateRectangle rect) throws TransportException {
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109 decoderId = (compControl & STREAM_ID_MASK) >> 4;
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110
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111 int filterId = 0;
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112 if ((compControl & FILTER_ID_MASK) > 0) { // filter byte presence
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113 filterId = reader.readUInt8();
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114 }
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115 int bytesPerCPixel = renderer.getBytesPerPixel();
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116 int lengthCurrentbpp = bytesPerCPixel * rect.width * rect.height;
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117 byte [] buffer;
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118 switch (filterId) {
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119 case BASIC_FILTER:
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120 buffer = readTightData(lengthCurrentbpp, reader);
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121 renderer.drawTightBytes(buffer, 0, rect.x, rect.y, rect.width, rect.height);
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122 break;
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123 case PALETTE_FILTER:
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124 int paletteSize = reader.readUInt8() + 1;
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125 int[] palette = readPalette(paletteSize, reader, renderer);
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126 int dataLength = paletteSize == 2 ?
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127 rect.height * ((rect.width + 7) / 8) :
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128 rect.width * rect.height;
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129 buffer = readTightData(dataLength, reader);
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130 renderer.drawBytesWithPalette(buffer, rect, palette);
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131 break;
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132 case GRADIENT_FILTER:
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133 /*
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134 * The "gradient" filter pre-processes pixel data with a simple algorithm
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135 * which converts each color component to a difference between a "predicted"
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136 * intensity and the actual intensity. Such a technique does not affect
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parents:
diff changeset
137 * uncompressed data size, but helps to compress photo-like images better.
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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138 * Pseudo-code for converting intensities to differences is the following:
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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139 *
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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140 * P[i,j] := V[i-1,j] + V[i,j-1] - V[i-1,j-1];
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parents:
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141 * if (P[i,j] < 0) then P[i,j] := 0;
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parents:
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142 * if (P[i,j] > MAX) then P[i,j] := MAX;
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parents:
diff changeset
143 * D[i,j] := V[i,j] - P[i,j];
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 *
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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145 * Here V[i,j] is the intensity of a color component for a pixel at
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 * coordinates (i,j). MAX is the maximum value of intensity for a color
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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147 * component.*/
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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148 buffer = readTightData(bytesPerCPixel * rect.width * rect.height, reader);
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parents:
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149 byte [][] opRows = new byte[2][rect.width * 3 + 3];
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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150 int opRowIndex = 0;
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 byte [] components = new byte[3];
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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152 int pixelOffset = 0;
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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153 ColorDecoder colorDecoder = renderer.getColorDecoder();
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 for (int i = 0; i < rect.height; ++i) {
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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155 // exchange thisRow and prevRow:
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 byte [] thisRow = opRows[opRowIndex];
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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157 byte [] prevRow = opRows[opRowIndex = (opRowIndex + 1) % 2];
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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158 for (int j = 3; j < rect.width * 3 + 3; j += 3) {
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parents:
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159 colorDecoder.fillRawComponents(components, buffer, pixelOffset);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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160 pixelOffset += bytesPerCPixel;
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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161 int
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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162 d = (0xff & prevRow[j + 0]) + // "upper" pixel (from prev row)
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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163 (0xff & thisRow[j + 0 - 3]) - // prev pixel
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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164 (0xff & prevRow[j + 0 - 3]); // "diagonal" prev pixel
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parents:
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165 thisRow[j + 0] = (byte) (components[0] + (d < 0 ? 0 : d > colorDecoder.redMax ? colorDecoder.redMax: d) & colorDecoder.redMax);
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parents:
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166 d = (0xff & prevRow[j + 1]) +
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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167 (0xff & thisRow[j + 1 - 3]) -
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parents:
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168 (0xff & prevRow[j + 1 - 3]);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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169 thisRow[j + 1] = (byte) (components[1] + (d < 0 ? 0 : d > colorDecoder.greenMax ? colorDecoder.greenMax: d) & colorDecoder.greenMax);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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170 d = (0xff & prevRow[j + 2]) +
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parents:
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171 (0xff & thisRow[j + 2 - 3]) -
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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172 (0xff & prevRow[j + 2 - 3]);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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173 thisRow[j + 2] = (byte) (components[2] + (d < 0 ? 0 : d > colorDecoder.blueMax ? colorDecoder.blueMax: d) & colorDecoder.blueMax);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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174 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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175 renderer.drawUncaliberedRGBLine(thisRow, rect.x, rect.y + i, rect.width);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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176 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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177
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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178 break;
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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179 default:
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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180 break;
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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181 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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182 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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183
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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184 /**
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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185 * Read palette from reader
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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186 */
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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187 private int[] readPalette(int paletteSize, Reader reader, Renderer renderer) throws TransportException {
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parents:
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188 /**
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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189 * When bytesPerPixel == 1 && paletteSize == 2 read 2 bytes of palette
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parents:
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190 * When bytesPerPixel == 1 && paletteSize != 2 - error
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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191 * When bytesPerPixel == 3 (4) read (paletteSize * 3) bytes of palette
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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192 * so use renderer.readPixelColor
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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193 */
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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194 int[] palette = new int[paletteSize];
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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195 for (int i = 0; i < palette.length; ++i) {
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parents:
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196 palette[i] = renderer.readTightPixelColor(reader);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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197 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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198 return palette;
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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199 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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200
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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201 /**
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 * Reads compressed (expected length >= MIN_SIZE_TO_COMPRESS) or
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 * uncompressed data. When compressed decompresses it.
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
204 *
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 * @param expectedLength expected data length in bytes
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 * @param reader
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 * @return result data
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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208 * @throws TransportException
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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209 */
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 private byte[] readTightData(int expectedLength, Reader reader) throws TransportException {
4689cc86d6cb create TreeViewer2 Repository
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parents:
diff changeset
211 if (expectedLength < MIN_SIZE_TO_COMPRESS) {
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parents:
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212 byte [] buffer = ByteBuffer.getInstance().getBuffer(expectedLength);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 reader.readBytes(buffer, 0, expectedLength);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 return buffer;
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
215 } else
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
216 return readCompressedData(expectedLength, reader);
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 }
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
218
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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219 /**
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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220 * Reads compressed data length, then read compressed data into rawBuffer
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
221 * and decompress data with expected length == length
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
222 *
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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223 * Note: returned data contains not only decompressed data but raw data at array tail
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parents:
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224 * which need to be ignored. Use only first expectedLength bytes.
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 *
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 * @param expectedLength expected data length
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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227 * @param reader
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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228 * @return decompressed data (length == expectedLength) / + followed raw data (ignore, please)
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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229 * @throws TransportException
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
230 */
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 private byte[] readCompressedData(int expectedLength, Reader reader) throws TransportException {
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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232 int rawDataLength = readCompactSize(reader);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
233
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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234 byte [] buffer = ByteBuffer.getInstance().getBuffer(expectedLength + rawDataLength);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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235 // read compressed (raw) data behind space allocated for decompressed data
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
236 reader.readBytes(buffer, expectedLength, rawDataLength);
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
237 if (null == decoders[decoderId]) {
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 decoders[decoderId] = new Inflater();
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 }
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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240 Inflater decoder = decoders[decoderId];
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 decoder.setInput(buffer, expectedLength, rawDataLength);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
242 try {
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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243 decoder.inflate(buffer, 0, expectedLength);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 } catch (DataFormatException e) {
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 logger.throwing("TightDecoder", "readCompressedData", e);
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parents:
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246 throw new TransportException("cannot inflate tight compressed data", e);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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247 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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248 return buffer;
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
249 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
250
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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251 private void processJpegType(Reader reader, Renderer renderer,
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
252 FramebufferUpdateRectangle rect) throws TransportException {
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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253 int jpegBufferLength = readCompactSize(reader);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 byte [] bytes = ByteBuffer.getInstance().getBuffer(jpegBufferLength);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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255 reader.readBytes(bytes, 0, jpegBufferLength);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
256 renderer.drawJpegImage(bytes, 0, jpegBufferLength, rect);
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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257 }
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
258
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
259 /**
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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260 * Read an integer from reader in compact representation (from 1 to 3 bytes).
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
261 * Highest bit of read byte set to 1 means next byte contains data.
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
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262 * Lower 7 bit of each byte contains significant data. Max bytes = 3.
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
263 * Less significant bytes first order.
4689cc86d6cb create TreeViewer2 Repository
Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
264 *
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
265 * @param reader
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
266 * @return int value
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
267 * @throws TransportException
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
268 */
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
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269 private int readCompactSize(Reader reader) throws TransportException {
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270 int b = reader.readUInt8();
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271 int size = b & 0x7F;
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272 if ((b & 0x80) != 0) {
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273 b = reader.readUInt8();
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274 size += (b & 0x7F) << 7;
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275 if ((b & 0x80) != 0) {
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276 size += reader.readUInt8() << 14;
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277 }
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278 }
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279 return size;
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280 }
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281
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Yu Taninari <you@cr.ie.u-ryukyu.ac.jp>
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282 /**
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283 * Flush (reset) zlib decoders when bits 3, 2, 1, 0 of compControl is set
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284 * @param compControl
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285 */
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286 private void resetDecoders(int compControl) {
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287 for (int i=0; i < DECODERS_NUM; ++i) {
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288 if ((compControl & 1) != 0 && decoders[i] != null) {
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289 decoders[i].reset();
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290 }
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291 compControl >>= 1;
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292 }
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293
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294 }
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295
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296 @Override
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297 public void reset() {
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298 decoders = new Inflater[DECODERS_NUM];
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299 }
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300
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301 }