25
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 IBM Corporation and others.
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3 * All rights reserved. This source file is made available under the terms contained in the README file
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4 * accompanying this program. The README file should be located in the about_files directory of the
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5 * plug-in that contains this source file.
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6 *
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7 * Contributors:
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8 * IBM Corporation - initial API and implementation
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9 * Port to the D programming language:
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10 * Frank Benoit <benoit@tionex.de>
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11 *******************************************************************************/
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12 module org.eclipse.swt.internal.image.JPEGFileFormat;
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13
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14 import org.eclipse.swt.SWT;
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15 import org.eclipse.swt.internal.image.JPEGFrameHeader;
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16 import org.eclipse.swt.internal.image.JPEGScanHeader;
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17 import org.eclipse.swt.internal.image.JPEGHuffmanTable;
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18 import org.eclipse.swt.internal.image.JPEGAppn;
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19 import org.eclipse.swt.internal.image.JPEGSegment;
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20 import org.eclipse.swt.internal.image.FileFormat;
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21 import org.eclipse.swt.internal.image.JPEGComment;
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22 import org.eclipse.swt.internal.image.JPEGArithmeticConditioningTable;
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23 import org.eclipse.swt.internal.image.JPEGRestartInterval;
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24 import org.eclipse.swt.internal.image.JPEGQuantizationTable;
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25 import org.eclipse.swt.internal.image.JPEGStartOfImage;
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26 import org.eclipse.swt.internal.image.JPEGDecoder;
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27 import org.eclipse.swt.internal.image.JPEGEndOfImage;
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28 import java.lang.all;
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29
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30 import org.eclipse.swt.graphics.RGB;
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31 import org.eclipse.swt.graphics.PaletteData;
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32
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33 import tango.core.Exception;
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34
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35 final class JPEGFileFormat : FileFormat {
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36 int restartInterval;
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37 JPEGFrameHeader frameHeader;
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38 int imageWidth, imageHeight;
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39 int interleavedMcuCols, interleavedMcuRows;
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40 int maxV, maxH;
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41 bool progressive;
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42 int samplePrecision;
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43 int nComponents;
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44 int[][] frameComponents;
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45 int[] componentIds;
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46 byte[][] imageComponents;
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47 int[] dataUnit;
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48 int[][][] dataUnits;
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49 int[] precedingDCs;
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50 JPEGScanHeader scanHeader;
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51 byte[] dataBuffer;
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52 int currentBitCount;
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53 int bufferCurrentPosition;
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54 int restartsToGo;
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55 int nextRestartNumber;
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56 JPEGHuffmanTable[] acHuffmanTables;
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57 JPEGHuffmanTable[] dcHuffmanTables;
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58 int[][] quantizationTables;
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59 int currentByte;
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60 int encoderQFactor = 75;
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61 int eobrun = 0;
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62 /* JPEGConstants */
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63 public static const int DCTSIZE = 8;
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64 public static const int DCTSIZESQR = 64;
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65 /* JPEGFixedPointConstants */
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66 public static const int FIX_0_899976223 = 7373;
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67 public static const int FIX_1_961570560 = 16069;
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68 public static const int FIX_2_053119869 = 16819;
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69 public static const int FIX_0_298631336 = 2446;
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70 public static const int FIX_1_847759065 = 15137;
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71 public static const int FIX_1_175875602 = 9633;
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72 public static const int FIX_3_072711026 = 25172;
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73 public static const int FIX_0_765366865 = 6270;
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74 public static const int FIX_2_562915447 = 20995;
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75 public static const int FIX_0_541196100 = 4433;
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76 public static const int FIX_0_390180644 = 3196;
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77 public static const int FIX_1_501321110 = 12299;
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78 /* JPEGMarkerCodes */
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79 public static const int APP0 = 0xFFE0;
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80 public static const int APP15 = 0xFFEF;
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81 public static const int COM = 0xFFFE;
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82 public static const int DAC = 0xFFCC;
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83 public static const int DHP = 0xFFDE;
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84 public static const int DHT = 0xFFC4;
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85 public static const int DNL = 0xFFDC;
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86 public static const int DRI = 0xFFDD;
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87 public static const int DQT = 0xFFDB;
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88 public static const int EOI = 0xFFD9;
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89 public static const int EXP = 0xFFDF;
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90 public static const int JPG = 0xFFC8;
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91 public static const int JPG0 = 0xFFF0;
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92 public static const int JPG13 = 0xFFFD;
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93 public static const int RST0 = 0xFFD0;
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94 public static const int RST1 = 0xFFD1;
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95 public static const int RST2 = 0xFFD2;
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96 public static const int RST3 = 0xFFD3;
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97 public static const int RST4 = 0xFFD4;
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98 public static const int RST5 = 0xFFD5;
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99 public static const int RST6 = 0xFFD6;
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100 public static const int RST7 = 0xFFD7;
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101 public static const int SOF0 = 0xFFC0;
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102 public static const int SOF1 = 0xFFC1;
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103 public static const int SOF2 = 0xFFC2;
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104 public static const int SOF3 = 0xFFC3;
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105 public static const int SOF5 = 0xFFC5;
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106 public static const int SOF6 = 0xFFC6;
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107 public static const int SOF7 = 0xFFC7;
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108 public static const int SOF9 = 0xFFC9;
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109 public static const int SOF10 = 0xFFCA;
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110 public static const int SOF11 = 0xFFCB;
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111 public static const int SOF13 = 0xFFCD;
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112 public static const int SOF14 = 0xFFCE;
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113 public static const int SOF15 = 0xFFCF;
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114 public static const int SOI = 0xFFD8;
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115 public static const int SOS = 0xFFDA;
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116 public static const int TEM = 0xFF01;
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117 /* JPEGFrameComponentParameterConstants */
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118 public static const int TQI = 0;
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119 public static const int HI = 1;
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120 public static const int VI = 2;
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121 public static const int CW = 3;
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122 public static const int CH = 4;
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123 /* JPEGScanComponentParameterConstants */
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124 public static const int DC = 0;
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125 public static const int AC = 1;
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126 /* JFIF Component Constants */
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127 public static const int ID_Y = 1 - 1;
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128 public static const int ID_CB = 2 - 1;
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129 public static const int ID_CR = 3 - 1;
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130 public static /*const*/ RGB[] RGB16;
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131 public static const int[] ExtendTest = [
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132 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048,
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133 4096, 8192, 16384, 32768, 65536, 131072, 262144
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134 ];
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135 public static const int[] ExtendOffset = [
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136 0, -1, -3, -7, -15, -31, -63, -127, -255, -511, -1023, -2047,
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137 -4095, -8191, -16383, -32767, -65535, -131071, -262143
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138 ];
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139 public static const int[] ZigZag8x8 = [
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140 0, 1, 8, 16, 9, 2, 3, 10,
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141 17, 24, 32, 25, 18, 11, 4, 5,
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142 12, 19, 26, 33, 40, 48, 41, 34,
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143 27, 20, 13, 6, 7, 14, 21, 28,
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144 35, 42, 49, 56, 57, 50, 43, 36,
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145 29, 22, 15, 23, 30, 37, 44, 51,
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146 58, 59, 52, 45, 38, 31, 39, 46,
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147 53, 60, 61, 54, 47, 55, 62, 63
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148 ];
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149
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150 public static int[] CrRTable, CbBTable, CrGTable, CbGTable;
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151 public static int[] RYTable, GYTable, BYTable,
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152 RCbTable, GCbTable, BCbTable, RCrTable, GCrTable, BCrTable, NBitsTable;
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153 //public static void static_this() {
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154 static this() {
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155
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156 RGB16 = [
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157 new RGB(0,0,0),
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158 new RGB(0x80,0,0),
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159 new RGB(0,0x80,0),
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160 new RGB(0x80,0x80,0),
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161 new RGB(0,0,0x80),
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162 new RGB(0x80,0,0x80),
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163 new RGB(0,0x80,0x80),
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164 new RGB(0xC0,0xC0,0xC0),
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165 new RGB(0x80,0x80,0x80),
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166 new RGB(0xFF,0,0),
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167 new RGB(0,0xFF,0),
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168 new RGB(0xFF,0xFF,0),
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169 new RGB(0,0,0xFF),
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170 new RGB(0xFF,0,0xFF),
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171 new RGB(0,0xFF,0xFF),
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172 new RGB(0xFF,0xFF,0xFF)
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173 ];
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174 int [] rYTable = new int[256];
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175 int [] gYTable = new int[256];
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176 int [] bYTable = new int[256];
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177 int [] rCbTable = new int[256];
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178 int [] gCbTable = new int[256];
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179 int [] bCbTable = new int[256];
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180 int [] rCrTable = new int[256];
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181 int [] gCrTable = new int[256];
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182 int [] bCrTable = new int[256];
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183 for (int i = 0; i < 256; i++) {
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184 rYTable[i] = i * 19595;
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185 gYTable[i] = i * 38470;
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186 bYTable[i] = i * 7471 + 32768;
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187 rCbTable[i] = i * -11059;
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188 gCbTable[i] = i * -21709;
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189 bCbTable[i] = i * 32768 + 8388608;
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190 gCrTable[i] = i * -27439;
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191 bCrTable[i] = i * -5329;
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192 }
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193 RYTable = rYTable;
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194 GYTable = gYTable;
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195 BYTable = bYTable;
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196 RCbTable = rCbTable;
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197 GCbTable = gCbTable;
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198 BCbTable = bCbTable;
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199 RCrTable = bCbTable;
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200 GCrTable = gCrTable;
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201 BCrTable = bCrTable;
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202
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203 /* Initialize YCbCr-RGB Tables */
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204 int [] crRTable = new int[256];
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205 int [] cbBTable = new int[256];
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206 int [] crGTable = new int[256];
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207 int [] cbGTable = new int[256];
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208 for (int i = 0; i < 256; i++) {
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209 int x2 = 2 * i - 255;
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210 crRTable[i] = (45941 * x2 + 32768) >> 16;
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211 cbBTable[i] = (58065 * x2 + 32768) >> 16;
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212 crGTable[i] = -23401 * x2;
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213 cbGTable[i] = -11277 * x2 + 32768;
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214 }
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215 CrRTable = crRTable;
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216 CbBTable = cbBTable;
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217 CrGTable = crGTable;
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218 CbGTable = cbGTable;
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219
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220 /* Initialize BitCount Table */
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221 int nBits = 1;
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222 int power2 = 2;
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223 int [] nBitsTable = new int[2048];
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224 nBitsTable[0] = 0;
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225 for (int i = 1; i < nBitsTable.length; i++) {
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226 if (!(i < power2)) {
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227 nBits++;
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228 power2 *= 2;
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229 }
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230 nBitsTable[i] = nBits;
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231 }
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232 NBitsTable = nBitsTable;
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233 }
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234 void compress(ImageData image, byte[] dataYComp, byte[] dataCbComp, byte[] dataCrComp) {
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235 int srcWidth = image.width;
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236 int srcHeight = image.height;
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237 int vhFactor = maxV * maxH;
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238 int[] frameComponent;
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239 imageComponents = new byte[][](nComponents);
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240 for (int i = 0; i < nComponents; i++) {
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241 frameComponent = frameComponents[componentIds[i]];
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242 imageComponents[i] = new byte[frameComponent[CW] * frameComponent[CH]];
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243 }
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244 frameComponent = frameComponents[componentIds[ID_Y]];
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245 for (int yPos = 0; yPos < srcHeight; yPos++) {
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246 int srcOfs = yPos * srcWidth;
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247 int dstOfs = yPos * frameComponent[CW];
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248 System.arraycopy(dataYComp, srcOfs, imageComponents[ID_Y], dstOfs, srcWidth);
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249 }
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250 frameComponent = frameComponents[componentIds[ID_CB]];
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251 for (int yPos = 0; yPos < srcHeight / maxV; yPos++) {
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252 int destRowIndex = yPos * frameComponent[CW];
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253 for (int xPos = 0; xPos < srcWidth / maxH; xPos++) {
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254 int sum = 0;
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255 for (int iv = 0; iv < maxV; iv++) {
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256 int srcIndex = (yPos * maxV + iv) * srcWidth + (xPos * maxH);
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257 for (int ih = 0; ih < maxH; ih++) {
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258 sum += dataCbComp[srcIndex + ih] & 0xFF;
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259 }
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260 }
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261 imageComponents[ID_CB][destRowIndex + xPos] = cast(byte)(sum / vhFactor);
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262 }
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263 }
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264 frameComponent = frameComponents[componentIds[ID_CR]];
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265 for (int yPos = 0; yPos < srcHeight / maxV; yPos++) {
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266 int destRowIndex = yPos * frameComponent[CW];
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267 for (int xPos = 0; xPos < srcWidth / maxH; xPos++) {
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268 int sum = 0;
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269 for (int iv = 0; iv < maxV; iv++) {
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270 int srcIndex = (yPos * maxV + iv) * srcWidth + (xPos * maxH);
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271 for (int ih = 0; ih < maxH; ih++) {
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272 sum += dataCrComp[srcIndex + ih] & 0xFF;
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273 }
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274 }
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275 imageComponents[ID_CR][destRowIndex + xPos] = cast(byte)(sum / vhFactor);
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276 }
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277 }
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278 for (int iComp = 0; iComp < nComponents; iComp++) {
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279 byte[] imageComponent = imageComponents[iComp];
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280 frameComponent = frameComponents[componentIds[iComp]];
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281 int hFactor = frameComponent[HI];
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282 int vFactor = frameComponent[VI];
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283 int componentWidth = frameComponent[CW];
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284 int componentHeight = frameComponent[CH];
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285 int compressedWidth = srcWidth / (maxH / hFactor);
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286 int compressedHeight = srcHeight / (maxV / vFactor);
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287 if (compressedWidth < componentWidth) {
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288 int delta = componentWidth - compressedWidth;
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289 for (int yPos = 0; yPos < compressedHeight; yPos++) {
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290 int dstOfs = ((yPos + 1) * componentWidth - delta);
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291 int dataValue = imageComponent[(dstOfs > 0) ? dstOfs - 1 : 0] & 0xFF;
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292 for (int i = 0; i < delta; i++) {
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293 imageComponent[dstOfs + i] = cast(byte)dataValue;
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294 }
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295 }
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296 }
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297 if (compressedHeight < componentHeight) {
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298 int srcOfs = (compressedHeight > 0) ? (compressedHeight - 1) * componentWidth : 1;
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299 for (int yPos = (compressedHeight > 0) ? compressedHeight : 1; yPos <= componentHeight; yPos++) {
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300 int dstOfs = (yPos - 1) * componentWidth;
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301 System.arraycopy(imageComponent, srcOfs, imageComponent, dstOfs, componentWidth);
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302 }
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303 }
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304 }
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305 }
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306 void convert4BitRGBToYCbCr(ImageData image) {
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307 RGB[] rgbs = image.getRGBs();
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308 int paletteSize = rgbs.length;
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309 byte[] yComp = new byte[paletteSize];
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310 byte[] cbComp = new byte[paletteSize];
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311 byte[] crComp = new byte[paletteSize];
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312 int srcWidth = image.width;
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313 int srcHeight = image.height;
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314 for (int i = 0; i < paletteSize; i++) {
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315 RGB color = rgbs[i];
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316 int r = color.red;
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317 int g = color.green;
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318 int b = color.blue;
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319 int n = RYTable[r] + GYTable[g] + BYTable[b];
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320 yComp[i] = cast(byte)(n >> 16);
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321 if ((n < 0) && ((n & 0xFFFF) !is 0)) yComp[i]--;
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322 n = RCbTable[r] + GCbTable[g] + BCbTable[b];
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323 cbComp[i] = cast(byte)(n >> 16);
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324 if ((n < 0) && ((n & 0xFFFF) !is 0)) cbComp[i]--;
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325 n = RCrTable[r] + GCrTable[g] + BCrTable[b];
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326 crComp[i] = cast(byte)(n >> 16);
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327 if ((n < 0) && ((n & 0xFFFF) !is 0)) crComp[i]--;
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328 }
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329 int bSize = srcWidth * srcHeight;
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330 byte[] dataYComp = new byte[bSize];
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331 byte[] dataCbComp = new byte[bSize];
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332 byte[] dataCrComp = new byte[bSize];
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333 byte[] origData = image.data;
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334 int bytesPerLine = image.bytesPerLine;
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335 int maxScanlineByte = srcWidth >> 1;
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336 for (int yPos = 0; yPos < srcHeight; yPos++) {
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337 for (int xPos = 0; xPos < maxScanlineByte; xPos++) {
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338 int srcIndex = yPos * bytesPerLine + xPos;
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339 int dstIndex = yPos * srcWidth + (xPos * 2);
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340 int value2 = origData[srcIndex] & 0xFF;
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341 int value1 = value2 >> 4;
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342 value2 &= 0x0F;
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343 dataYComp[dstIndex] = yComp[value1];
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344 dataCbComp[dstIndex] = cbComp[value1];
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345 dataCrComp[dstIndex] = crComp[value1];
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346 dataYComp[dstIndex + 1] = yComp[value2];
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347 dataCbComp[dstIndex + 1] = cbComp[value2];
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348 dataCrComp[dstIndex + 1] = crComp[value2];
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349 }
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350 }
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351 compress(image, dataYComp, dataCbComp, dataCrComp);
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352 }
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353 void convert8BitRGBToYCbCr(ImageData image) {
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354 RGB[] rgbs = image.getRGBs();
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355 int paletteSize = rgbs.length;
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356 byte[] yComp = new byte[paletteSize];
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357 byte[] cbComp = new byte[paletteSize];
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358 byte[] crComp = new byte[paletteSize];
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359 int srcWidth = image.width;
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360 int srcHeight = image.height;
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361 for (int i = 0; i < paletteSize; i++) {
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362 RGB color = rgbs[i];
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363 int r = color.red;
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364 int g = color.green;
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365 int b = color.blue;
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366 int n = RYTable[r] + GYTable[g] + BYTable[b];
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367 yComp[i] = cast(byte)(n >> 16);
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368 if ((n < 0) && ((n & 0xFFFF) !is 0)) yComp[i]--;
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369 n = RCbTable[r] + GCbTable[g] + BCbTable[b];
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370 cbComp[i] = cast(byte)(n >> 16);
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371 if ((n < 0) && ((n & 0xFFFF) !is 0)) cbComp[i]--;
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372 n = RCrTable[r] + GCrTable[g] + BCrTable[b];
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373 crComp[i] = cast(byte)(n >> 16);
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374 if ((n < 0) && ((n & 0xFFFF) !is 0)) crComp[i]--;
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375 }
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376 int dstWidth = image.width;
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377 int dstHeight = srcHeight;
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378 int stride = ((srcWidth + 3) >> 2) << 2;
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379 int bSize = dstWidth * dstHeight;
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380 byte[] dataYComp = new byte[bSize];
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381 byte[] dataCbComp = new byte[bSize];
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382 byte[] dataCrComp = new byte[bSize];
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383 byte[] origData = image.data;
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384 for (int yPos = 0; yPos < srcHeight; yPos++) {
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385 int srcRowIndex = yPos * stride;
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386 int dstRowIndex = yPos * dstWidth;
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387 for (int xPos = 0; xPos < srcWidth; xPos++) {
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388 int value = origData[srcRowIndex + xPos] & 0xFF;
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389 int dstIndex = dstRowIndex + xPos;
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390 dataYComp[dstIndex] = yComp[value];
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391 dataCbComp[dstIndex] = cbComp[value];
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392 dataCrComp[dstIndex] = crComp[value];
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393 }
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394 }
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395 compress(image, dataYComp, dataCbComp, dataCrComp);
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396 }
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397 byte[] convertCMYKToRGB() {
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398 /* Unsupported CMYK format. Answer an empty byte array. */
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399 return new byte[0];
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400 }
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401 void convertImageToYCbCr(ImageData image) {
|
|
402 switch (image.depth) {
|
|
403 case 4:
|
|
404 convert4BitRGBToYCbCr(image);
|
|
405 return;
|
|
406 case 8:
|
|
407 convert8BitRGBToYCbCr(image);
|
|
408 return;
|
|
409 case 16:
|
|
410 case 24:
|
|
411 case 32:
|
|
412 convertMultiRGBToYCbCr(image);
|
|
413 return;
|
|
414 default:
|
|
415 SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
|
|
416 }
|
|
417 return;
|
|
418 }
|
|
419 void convertMultiRGBToYCbCr(ImageData image) {
|
|
420 int srcWidth = image.width;
|
|
421 int srcHeight = image.height;
|
|
422 int bSize = srcWidth * srcHeight;
|
|
423 byte[] dataYComp = new byte[bSize];
|
|
424 byte[] dataCbComp = new byte[bSize];
|
|
425 byte[] dataCrComp = new byte[bSize];
|
|
426 PaletteData palette = image.palette;
|
|
427 int[] buffer = new int[srcWidth];
|
|
428 if (palette.isDirect) {
|
|
429 int redMask = palette.redMask;
|
|
430 int greenMask = palette.greenMask;
|
|
431 int blueMask = palette.blueMask;
|
|
432 int redShift = palette.redShift;
|
|
433 int greenShift = palette.greenShift;
|
|
434 int blueShift = palette.blueShift;
|
|
435 for (int yPos = 0; yPos < srcHeight; yPos++) {
|
|
436 image.getPixels(0, yPos, srcWidth, buffer, 0);
|
|
437 int dstRowIndex = yPos * srcWidth;
|
|
438 for (int xPos = 0; xPos < srcWidth; xPos++) {
|
|
439 int pixel = buffer[xPos];
|
|
440 int dstDataIndex = dstRowIndex + xPos;
|
|
441 int r = pixel & redMask;
|
|
442 r = (redShift < 0) ? r >>> -redShift : r << redShift;
|
|
443 int g = pixel & greenMask;
|
|
444 g = (greenShift < 0) ? g >>> -greenShift : g << greenShift;
|
|
445 int b = pixel & blueMask;
|
|
446 b = (blueShift < 0) ? b >>> -blueShift : b << blueShift;
|
|
447 dataYComp[dstDataIndex] = cast(byte)((RYTable[r] + GYTable[g] + BYTable[b]) >> 16);
|
|
448 dataCbComp[dstDataIndex] = cast(byte)((RCbTable[r] + GCbTable[g] + BCbTable[b]) >> 16);
|
|
449 dataCrComp[dstDataIndex] = cast(byte)((RCrTable[r] + GCrTable[g] + BCrTable[b]) >> 16);
|
|
450 }
|
|
451 }
|
|
452 } else {
|
|
453 for (int yPos = 0; yPos < srcHeight; yPos++) {
|
|
454 image.getPixels(0, yPos, srcWidth, buffer, 0);
|
|
455 int dstRowIndex = yPos * srcWidth;
|
|
456 for (int xPos = 0; xPos < srcWidth; xPos++) {
|
|
457 int pixel = buffer[xPos];
|
|
458 int dstDataIndex = dstRowIndex + xPos;
|
|
459 RGB rgb = palette.getRGB(pixel);
|
|
460 int r = rgb.red;
|
|
461 int g = rgb.green;
|
|
462 int b = rgb.blue;
|
|
463 dataYComp[dstDataIndex] = cast(byte)((RYTable[r] + GYTable[g] + BYTable[b]) >> 16);
|
|
464 dataCbComp[dstDataIndex] = cast(byte)((RCbTable[r] + GCbTable[g] + BCbTable[b]) >> 16);
|
|
465 dataCrComp[dstDataIndex] = cast(byte)((RCrTable[r] + GCrTable[g] + BCrTable[b]) >> 16);
|
|
466 }
|
|
467 }
|
|
468 }
|
|
469 compress(image, dataYComp, dataCbComp, dataCrComp);
|
|
470 }
|
|
471 byte[] convertYToRGB() {
|
|
472 int compWidth = frameComponents[componentIds[ID_Y]][CW];
|
|
473 int bytesPerLine = (((imageWidth * 8 + 7) / 8) + 3) / 4 * 4;
|
|
474 byte[] data = new byte[bytesPerLine * imageHeight];
|
|
475 byte[] yComp = imageComponents[ID_Y];
|
|
476 int destIndex = 0;
|
|
477 for (int i = 0; i < imageHeight; i++) {
|
|
478 int srcIndex = i * compWidth;
|
|
479 for (int j = 0; j < bytesPerLine; j++) {
|
|
480 int y = yComp[srcIndex] & 0xFF;
|
|
481 if (y < 0) {
|
|
482 y = 0;
|
|
483 } else {
|
|
484 if (y > 255) y = 255;
|
|
485 }
|
|
486 if (j >= imageWidth) {
|
|
487 y = 0;
|
|
488 }
|
|
489 data[destIndex] = cast(byte)y;
|
|
490 srcIndex++;
|
|
491 destIndex++;
|
|
492 }
|
|
493 }
|
|
494 return data;
|
|
495 }
|
|
496 byte[] convertYCbCrToRGB() {
|
|
497 /**
|
|
498 * Convert existing image components into an RGB format.
|
|
499 * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
|
|
500 * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
|
|
501 * The conversion equations to be implemented are therefore
|
|
502 * R = Y + 1.40200 * Cr
|
|
503 * G = Y - 0.34414 * Cb - 0.71414 * Cr
|
|
504 * B = Y + 1.77200 * Cb
|
|
505 * where Cb and Cr represent the incoming values less MAXJSAMPLE/2.
|
|
506 * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
|
|
507 *
|
|
508 * To avoid floating-point arithmetic, we represent the fractional constants
|
|
509 * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
|
|
510 * the products by 2^16, with appropriate rounding, to get the correct answer.
|
|
511 * Notice that Y, being an integral input, does not contribute any fraction
|
|
512 * so it need not participate in the rounding.
|
|
513 *
|
|
514 * For even more speed, we avoid doing any multiplications in the inner loop
|
|
515 * by precalculating the constants times Cb and Cr for all possible values.
|
|
516 * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
|
|
517 * for 12-bit samples it is still acceptable. It's not very reasonable for
|
|
518 * 16-bit samples, but if you want lossless storage you shouldn't be changing
|
|
519 * colorspace anyway.
|
|
520 * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
|
|
521 * values for the G calculation are left scaled up, since we must add them
|
|
522 * together before rounding.
|
|
523 */
|
|
524 int bSize = imageWidth * imageHeight * nComponents;
|
|
525 byte[] rgbData = new byte[bSize];
|
|
526 int destIndex = 0;
|
|
527 expandImageComponents();
|
|
528 byte[] yComp = imageComponents[ID_Y];
|
|
529 byte[] cbComp = imageComponents[ID_CB];
|
|
530 byte[] crComp = imageComponents[ID_CR];
|
|
531 int compWidth = frameComponents[componentIds[ID_Y]][CW];
|
|
532 for (int v = 0; v < imageHeight; v++) {
|
|
533 int srcIndex = v * compWidth;
|
|
534 for (int i = 0; i < imageWidth; i++) {
|
|
535 int y = yComp[srcIndex] & 0xFF;
|
|
536 int cb = cbComp[srcIndex] & 0xFF;
|
|
537 int cr = crComp[srcIndex] & 0xFF;
|
|
538 int r = y + CrRTable[cr];
|
|
539 int g = y + ((CbGTable[cb] + CrGTable[cr]) >> 16);
|
|
540 int b = y + CbBTable[cb];
|
|
541 if (r < 0) {
|
|
542 r = 0;
|
|
543 } else {
|
|
544 if (r > 255) r = 255;
|
|
545 }
|
|
546 if (g < 0) {
|
|
547 g = 0;
|
|
548 } else {
|
|
549 if (g > 255) g = 255;
|
|
550 }
|
|
551 if (b < 0) {
|
|
552 b = 0;
|
|
553 } else {
|
|
554 if (b > 255) b = 255;
|
|
555 }
|
|
556 rgbData[destIndex] = cast(byte)b;
|
|
557 rgbData[destIndex + 1] = cast(byte)g;
|
|
558 rgbData[destIndex + 2] = cast(byte)r;
|
|
559 destIndex += 3;
|
|
560 srcIndex++;
|
|
561 }
|
|
562 }
|
|
563 return rgbData;
|
|
564 }
|
|
565 void decodeACCoefficients(int[] dataUnit, int iComp) {
|
|
566 int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
|
|
567 JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
|
|
568 int k = 1;
|
|
569 while (k < 64) {
|
|
570 int rs = decodeUsingTable(acTable);
|
|
571 int r = rs >> 4;
|
|
572 int s = rs & 0xF;
|
|
573 if (s is 0) {
|
|
574 if (r is 15) {
|
|
575 k += 16;
|
|
576 } else {
|
|
577 break;
|
|
578 }
|
|
579 } else {
|
|
580 k += r;
|
|
581 int bits = receive(s);
|
|
582 dataUnit[ZigZag8x8[k]] = extendBy(bits, s);
|
|
583 k++;
|
|
584 }
|
|
585 }
|
|
586 }
|
|
587 void decodeACFirstCoefficients(int[] dataUnit, int iComp, int start, int end, int approxBit) {
|
|
588 if (eobrun > 0) {
|
|
589 eobrun--;
|
|
590 return;
|
|
591 }
|
|
592 int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
|
|
593 JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
|
|
594 int k = start;
|
|
595 while (k <= end) {
|
|
596 int rs = decodeUsingTable(acTable);
|
|
597 int r = rs >> 4;
|
|
598 int s = rs & 0xF;
|
|
599 if (s is 0) {
|
|
600 if (r is 15) {
|
|
601 k += 16;
|
|
602 } else {
|
|
603 eobrun = (1 << r) + receive(r) - 1;
|
|
604 break;
|
|
605 }
|
|
606 } else {
|
|
607 k += r;
|
|
608 int bits = receive(s);
|
|
609 dataUnit[ZigZag8x8[k]] = extendBy(bits, s) << approxBit;
|
|
610 k++;
|
|
611 }
|
|
612 }
|
|
613 }
|
|
614 void decodeACRefineCoefficients(int[] dataUnit, int iComp, int start, int end, int approxBit) {
|
|
615 int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
|
|
616 JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
|
|
617 int k = start;
|
|
618 while (k <= end) {
|
|
619 if (eobrun > 0) {
|
|
620 while (k <= end) {
|
|
621 int zzIndex = ZigZag8x8[k];
|
|
622 if (dataUnit[zzIndex] !is 0) {
|
|
623 dataUnit[zzIndex] = refineAC(dataUnit[zzIndex], approxBit);
|
|
624 }
|
|
625 k++;
|
|
626 }
|
|
627 eobrun--;
|
|
628 } else {
|
|
629 int rs = decodeUsingTable(acTable);
|
|
630 int r = rs >> 4;
|
|
631 int s = rs & 0xF;
|
|
632 if (s is 0) {
|
|
633 if (r is 15) {
|
|
634 int zeros = 0;
|
|
635 while (zeros < 16 && k <= end) {
|
|
636 int zzIndex = ZigZag8x8[k];
|
|
637 if (dataUnit[zzIndex] !is 0) {
|
|
638 dataUnit[zzIndex] = refineAC(dataUnit[zzIndex], approxBit);
|
|
639 } else {
|
|
640 zeros++;
|
|
641 }
|
|
642 k++;
|
|
643 }
|
|
644 } else {
|
|
645 eobrun = (1 << r) + receive(r);
|
|
646 }
|
|
647 } else {
|
|
648 int bit = receive(s);
|
|
649 int zeros = 0;
|
|
650 int zzIndex = ZigZag8x8[k];
|
|
651 while ((zeros < r || dataUnit[zzIndex] !is 0) && k <= end) {
|
|
652 if (dataUnit[zzIndex] !is 0) {
|
|
653 dataUnit[zzIndex] = refineAC(dataUnit[zzIndex], approxBit);
|
|
654 } else {
|
|
655 zeros++;
|
|
656 }
|
|
657 k++;
|
|
658 zzIndex = ZigZag8x8[k];
|
|
659 }
|
|
660 if (bit !is 0) {
|
|
661 dataUnit[zzIndex] = 1 << approxBit;
|
|
662 } else {
|
|
663 dataUnit[zzIndex] = -1 << approxBit;
|
|
664 }
|
|
665 k++;
|
|
666 }
|
|
667 }
|
|
668 }
|
|
669 }
|
|
670 int refineAC(int ac, int approxBit) {
|
|
671 if (ac > 0) {
|
|
672 int bit = nextBit();
|
|
673 if (bit !is 0) {
|
|
674 ac += 1 << approxBit;
|
|
675 }
|
|
676 } else if (ac < 0) {
|
|
677 int bit = nextBit();
|
|
678 if (bit !is 0) {
|
|
679 ac += -1 << approxBit;
|
|
680 }
|
|
681 }
|
|
682 return ac;
|
|
683 }
|
|
684 void decodeDCCoefficient(int[] dataUnit, int iComp, bool first, int approxBit) {
|
|
685 int[] sParams = scanHeader.componentParameters[componentIds[iComp]];
|
|
686 JPEGHuffmanTable dcTable = dcHuffmanTables[sParams[DC]];
|
|
687 int lastDC = 0;
|
|
688 if (progressive && !first) {
|
|
689 int bit = nextBit();
|
|
690 lastDC = dataUnit[0] + (bit << approxBit);
|
|
691 } else {
|
|
692 lastDC = precedingDCs[iComp];
|
|
693 int nBits = decodeUsingTable(dcTable);
|
|
694 if (nBits !is 0) {
|
|
695 int bits = receive(nBits);
|
|
696 int diff = extendBy(bits, nBits);
|
|
697 lastDC += diff;
|
|
698 precedingDCs[iComp] = lastDC;
|
|
699 }
|
|
700 if (progressive) {
|
|
701 lastDC = lastDC << approxBit;
|
|
702 }
|
|
703 }
|
|
704 dataUnit[0] = lastDC;
|
|
705 }
|
|
706 void dequantize(int[] dataUnit, int iComp) {
|
|
707 int[] qTable = quantizationTables[frameComponents[componentIds[iComp]][TQI]];
|
|
708 for (int i = 0; i < dataUnit.length; i++) {
|
|
709 int zzIndex = ZigZag8x8[i];
|
|
710 dataUnit[zzIndex] = dataUnit[zzIndex] * qTable[i];
|
|
711 }
|
|
712 }
|
|
713 byte[] decodeImageComponents() {
|
|
714 if (nComponents is 3) { // compIds 1, 2, 3
|
|
715 return convertYCbCrToRGB();
|
|
716 }
|
|
717 // if (nComponents is 3) { // compIds 1, 4, 5
|
|
718 // Unsupported CMYK format.
|
|
719 // return convertYIQToRGB();
|
|
720 // }
|
|
721 if (nComponents is 4) {
|
|
722 return convertCMYKToRGB();
|
|
723 }
|
|
724 return convertYToRGB();
|
|
725 }
|
|
726 void decodeMCUAtXAndY(int xmcu, int ymcu, int nComponentsInScan, bool first, int start, int end, int approxBit) {
|
|
727 for (int iComp = 0; iComp < nComponentsInScan; iComp++) {
|
|
728 int scanComponent = iComp;
|
|
729 while (scanHeader.componentParameters[componentIds[scanComponent]] is null) {
|
|
730 scanComponent++;
|
|
731 }
|
|
732 int[] frameComponent = frameComponents[componentIds[scanComponent]];
|
|
733 int hi = frameComponent[HI];
|
|
734 int vi = frameComponent[VI];
|
|
735 if (nComponentsInScan is 1) {
|
|
736 hi = 1;
|
|
737 vi = 1;
|
|
738 }
|
|
739 int compWidth = frameComponent[CW];
|
|
740 for (int ivi = 0; ivi < vi; ivi++) {
|
|
741 for (int ihi = 0; ihi < hi; ihi++) {
|
|
742 if (progressive) {
|
|
743 // Progressive: First scan - create a new data unit.
|
|
744 // Subsequent scans - refine the existing data unit.
|
|
745 int index = (ymcu * vi + ivi) * compWidth + xmcu * hi + ihi;
|
|
746 dataUnit = dataUnits[scanComponent][index];
|
|
747 if (dataUnit is null) {
|
|
748 dataUnit = new int[64];
|
|
749 dataUnits[scanComponent][index] = dataUnit;
|
|
750 }
|
|
751 } else {
|
|
752 // Sequential: Clear and reuse the data unit buffer.
|
|
753 for (int i = 0; i < dataUnit.length; i++) {
|
|
754 dataUnit[i] = 0;
|
|
755 }
|
|
756 }
|
|
757 if (!progressive || scanHeader.isDCProgressiveScan()) {
|
|
758 decodeDCCoefficient(dataUnit, scanComponent, first, approxBit);
|
|
759 }
|
|
760 if (!progressive) {
|
|
761 decodeACCoefficients(dataUnit, scanComponent);
|
|
762 } else {
|
|
763 if (scanHeader.isACProgressiveScan()) {
|
|
764 if (first) {
|
|
765 decodeACFirstCoefficients(dataUnit, scanComponent, start, end, approxBit);
|
|
766 } else {
|
|
767 decodeACRefineCoefficients(dataUnit, scanComponent, start, end, approxBit);
|
|
768 }
|
|
769 }
|
|
770 if (loader.hasListeners()) {
|
|
771 // Dequantization, IDCT, up-sampling and color conversion
|
|
772 // are done on a copy of the coefficient data in order to
|
|
773 // display the image incrementally.
|
|
774 int[] temp = dataUnit;
|
|
775 dataUnit = new int[64];
|
|
776 System.arraycopy(temp, 0, dataUnit, 0, 64);
|
|
777 }
|
|
778 }
|
|
779 if (!progressive || (progressive && loader.hasListeners())) {
|
|
780 dequantize(dataUnit, scanComponent);
|
|
781 inverseDCT(dataUnit);
|
|
782 storeData(dataUnit, scanComponent, xmcu, ymcu, hi, ihi, vi, ivi);
|
|
783 }
|
|
784 }
|
|
785 }
|
|
786 }
|
|
787 }
|
|
788 void decodeScan() {
|
|
789 if (progressive && !scanHeader.verifyProgressiveScan()) {
|
|
790 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
791 }
|
|
792 int nComponentsInScan = scanHeader.getNumberOfImageComponents();
|
|
793 int mcuRowsInScan = interleavedMcuRows;
|
|
794 int mcusPerRow = interleavedMcuCols;
|
|
795 if (nComponentsInScan is 1) {
|
|
796 // Non-interleaved.
|
|
797 int scanComponent = 0;
|
|
798 while (scanHeader.componentParameters[componentIds[scanComponent]] is null) {
|
|
799 scanComponent++;
|
|
800 }
|
|
801 int[] frameComponent = frameComponents[componentIds[scanComponent]];
|
|
802 int hi = frameComponent[HI];
|
|
803 int vi = frameComponent[VI];
|
|
804 int mcuWidth = DCTSIZE * maxH / hi;
|
|
805 int mcuHeight = DCTSIZE * maxV / vi;
|
|
806 mcusPerRow = (imageWidth + mcuWidth - 1) / mcuWidth;
|
|
807 mcuRowsInScan = (imageHeight + mcuHeight - 1) / mcuHeight;
|
|
808 }
|
|
809 bool first = scanHeader.isFirstScan();
|
|
810 int start = scanHeader.getStartOfSpectralSelection();
|
|
811 int end = scanHeader.getEndOfSpectralSelection();
|
|
812 int approxBit = scanHeader.getApproxBitPositionLow();
|
|
813 restartsToGo = restartInterval;
|
|
814 nextRestartNumber = 0;
|
|
815 for (int ymcu = 0; ymcu < mcuRowsInScan; ymcu++) {
|
|
816 for (int xmcu = 0; xmcu < mcusPerRow; xmcu++) {
|
|
817 if (restartInterval !is 0) {
|
|
818 if (restartsToGo is 0) processRestartInterval();
|
|
819 restartsToGo--;
|
|
820 }
|
|
821 decodeMCUAtXAndY(xmcu, ymcu, nComponentsInScan, first, start, end, approxBit);
|
|
822 }
|
|
823 }
|
|
824 }
|
|
825 int decodeUsingTable(JPEGHuffmanTable huffmanTable) {
|
|
826 int i = 0;
|
|
827 int[] maxCodes = huffmanTable.getDhMaxCodes();
|
|
828 int[] minCodes = huffmanTable.getDhMinCodes();
|
|
829 int[] valPtrs = huffmanTable.getDhValPtrs();
|
|
830 int[] huffVals = huffmanTable.getDhValues();
|
|
831 int code = nextBit();
|
|
832 while (code > maxCodes[i]) {
|
|
833 code = code * 2 + nextBit();
|
|
834 i++;
|
|
835 }
|
|
836 int j = valPtrs[i] + code - minCodes[i];
|
|
837 return huffVals[j];
|
|
838 }
|
|
839 void emit(int huffCode, int nBits) {
|
|
840 if (nBits is 0) {
|
|
841 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
842 }
|
|
843 int[] power2m1 = [
|
|
844 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191,
|
|
845 16383, 32767, 65535, 131125
|
|
846 ];
|
|
847 int code = (huffCode & power2m1[nBits - 1]) << (24 - nBits - currentBitCount);
|
|
848 byte[] codeBuffer = new byte[4];
|
|
849 codeBuffer[0] = cast(byte)(code & 0xFF);
|
|
850 codeBuffer[1] = cast(byte)((code >> 8) & 0xFF);
|
|
851 codeBuffer[2] = cast(byte)((code >> 16) & 0xFF);
|
|
852 codeBuffer[3] = cast(byte)((code >> 24) & 0xFF);
|
|
853 int abs = nBits - (8 - currentBitCount);
|
|
854 if (abs < 0) abs = -abs;
|
|
855 if ((abs >> 3) > 0) {
|
|
856 currentByte += codeBuffer[2];
|
|
857 emitByte(cast(byte)currentByte);
|
|
858 emitByte(codeBuffer[1]);
|
|
859 currentByte = codeBuffer[0];
|
|
860 currentBitCount += nBits - 16;
|
|
861 } else {
|
|
862 currentBitCount += nBits;
|
|
863 if (currentBitCount >= 8) {
|
|
864 currentByte += codeBuffer[2];
|
|
865 emitByte(cast(byte)currentByte);
|
|
866 currentByte = codeBuffer[1];
|
|
867 currentBitCount -= 8;
|
|
868 } else {
|
|
869 currentByte += codeBuffer[2];
|
|
870 }
|
|
871 }
|
|
872 }
|
|
873 void emitByte(byte byteValue) {
|
|
874 if (bufferCurrentPosition >= 512) {
|
|
875 resetOutputBuffer();
|
|
876 }
|
|
877 dataBuffer[bufferCurrentPosition] = byteValue;
|
|
878 bufferCurrentPosition++;
|
|
879 if (byteValue is -1) {
|
|
880 emitByte(cast(byte)0);
|
|
881 }
|
|
882 }
|
|
883 void encodeACCoefficients(int[] dataUnit, int iComp) {
|
|
884 int[] sParams = scanHeader.componentParameters[iComp];
|
|
885 JPEGHuffmanTable acTable = acHuffmanTables[sParams[AC]];
|
|
886 int[] ehCodes = acTable.ehCodes;
|
|
887 byte[] ehSizes = acTable.ehCodeLengths;
|
|
888 int r = 0;
|
|
889 int k = 1;
|
|
890 while (k < 64) {
|
|
891 k++;
|
|
892 int acValue = dataUnit[ZigZag8x8[k - 1]];
|
|
893 if (acValue is 0) {
|
|
894 if (k is 64) {
|
|
895 emit(ehCodes[0], ehSizes[0] & 0xFF);
|
|
896 } else {
|
|
897 r++;
|
|
898 }
|
|
899 } else {
|
|
900 while (r > 15) {
|
|
901 emit(ehCodes[0xF0], ehSizes[0xF0] & 0xFF);
|
|
902 r -= 16;
|
|
903 }
|
|
904 if (acValue < 0) {
|
|
905 int absACValue = acValue;
|
|
906 if (absACValue < 0) absACValue = -absACValue;
|
|
907 int nBits = NBitsTable[absACValue];
|
|
908 int rs = r * 16 + nBits;
|
|
909 emit(ehCodes[rs], ehSizes[rs] & 0xFF);
|
|
910 emit(0xFFFFFF - absACValue, nBits);
|
|
911 } else {
|
|
912 int nBits = NBitsTable[acValue];
|
|
913 int rs = r * 16 + nBits;
|
|
914 emit(ehCodes[rs], ehSizes[rs] & 0xFF);
|
|
915 emit(acValue, nBits);
|
|
916 }
|
|
917 r = 0;
|
|
918 }
|
|
919 }
|
|
920 }
|
|
921 void encodeDCCoefficients(int[] dataUnit, int iComp) {
|
|
922 int[] sParams = scanHeader.componentParameters[iComp];
|
|
923 JPEGHuffmanTable dcTable = dcHuffmanTables[sParams[DC]];
|
|
924 int lastDC = precedingDCs[iComp];
|
|
925 int dcValue = dataUnit[0];
|
|
926 int diff = dcValue - lastDC;
|
|
927 precedingDCs[iComp] = dcValue;
|
|
928 if (diff < 0) {
|
|
929 int absDiff = 0 - diff;
|
|
930 int nBits = NBitsTable[absDiff];
|
|
931 emit(dcTable.ehCodes[nBits], dcTable.ehCodeLengths[nBits]);
|
|
932 emit(0xFFFFFF - absDiff, nBits);
|
|
933 } else {
|
|
934 int nBits = NBitsTable[diff];
|
|
935 emit(dcTable.ehCodes[nBits], dcTable.ehCodeLengths[nBits]);
|
|
936 if (nBits !is 0) {
|
|
937 emit(diff, nBits);
|
|
938 }
|
|
939 }
|
|
940 }
|
|
941 void encodeMCUAtXAndY(int xmcu, int ymcu) {
|
|
942 int nComponentsInScan = scanHeader.getNumberOfImageComponents();
|
|
943 dataUnit = new int[64];
|
|
944 for (int iComp = 0; iComp < nComponentsInScan; iComp++) {
|
|
945 int[] frameComponent = frameComponents[componentIds[iComp]];
|
|
946 int hi = frameComponent[HI];
|
|
947 int vi = frameComponent[VI];
|
|
948 for (int ivi = 0; ivi < vi; ivi++) {
|
|
949 for (int ihi = 0; ihi < hi; ihi++) {
|
|
950 extractData(dataUnit, iComp, xmcu, ymcu, ihi, ivi);
|
|
951 forwardDCT(dataUnit);
|
|
952 quantizeData(dataUnit, iComp);
|
|
953 encodeDCCoefficients(dataUnit, iComp);
|
|
954 encodeACCoefficients(dataUnit, iComp);
|
|
955 }
|
|
956 }
|
|
957 }
|
|
958 }
|
|
959 void encodeScan() {
|
|
960 for (int ymcu = 0; ymcu < interleavedMcuRows; ymcu++) {
|
|
961 for (int xmcu = 0; xmcu < interleavedMcuCols; xmcu++) {
|
|
962 encodeMCUAtXAndY(xmcu, ymcu);
|
|
963 }
|
|
964 }
|
|
965 if (currentBitCount !is 0) {
|
|
966 emitByte(cast(byte)currentByte);
|
|
967 }
|
|
968 resetOutputBuffer();
|
|
969 }
|
|
970 void expandImageComponents() {
|
|
971 for (int iComp = 0; iComp < nComponents; iComp++) {
|
|
972 int[] frameComponent = frameComponents[componentIds[iComp]];
|
|
973 int hi = frameComponent[HI];
|
|
974 int vi = frameComponent[VI];
|
|
975 int upH = maxH / hi;
|
|
976 int upV = maxV / vi;
|
|
977 if ((upH * upV) > 1) {
|
|
978 byte[] component = imageComponents[iComp];
|
|
979 int compWidth = frameComponent[CW];
|
|
980 int compHeight = frameComponent[CH];
|
|
981 int upCompWidth = compWidth * upH;
|
|
982 int upCompHeight = compHeight * upV;
|
|
983 ImageData src = new ImageData(compWidth, compHeight, 8, new PaletteData(RGB16), 4, component);
|
|
984 ImageData dest = src.scaledTo(upCompWidth, upCompHeight);
|
|
985 imageComponents[iComp] = dest.data;
|
|
986 }
|
|
987 }
|
|
988 }
|
|
989 int extendBy(int diff, int t) {
|
|
990 if (diff < ExtendTest[t]) {
|
|
991 return diff + ExtendOffset[t];
|
|
992 } else {
|
|
993 return diff;
|
|
994 }
|
|
995 }
|
|
996 void extractData(int[] dataUnit, int iComp, int xmcu, int ymcu, int ihi, int ivi) {
|
|
997 byte[] compImage = imageComponents[iComp];
|
|
998 int[] frameComponent = frameComponents[componentIds[iComp]];
|
|
999 int hi = frameComponent[HI];
|
|
1000 int vi = frameComponent[VI];
|
|
1001 int compWidth = frameComponent[CW];
|
|
1002 int srcIndex = ((ymcu * vi + ivi) * compWidth * DCTSIZE) + ((xmcu * hi + ihi) * DCTSIZE);
|
|
1003 int destIndex = 0;
|
|
1004 for (int i = 0; i < DCTSIZE; i++) {
|
|
1005 for (int col = 0; col < DCTSIZE; col++) {
|
|
1006 dataUnit[destIndex] = (compImage[srcIndex + col] & 0xFF) - 128;
|
|
1007 destIndex++;
|
|
1008 }
|
|
1009 srcIndex += compWidth;
|
|
1010 }
|
|
1011 }
|
|
1012 void forwardDCT(int[] dataUnit) {
|
|
1013 for (int row = 0; row < 8; row++) {
|
|
1014 int rIndex = row * DCTSIZE;
|
|
1015 int tmp0 = dataUnit[rIndex] + dataUnit[rIndex + 7];
|
|
1016 int tmp7 = dataUnit[rIndex] - dataUnit[rIndex + 7];
|
|
1017 int tmp1 = dataUnit[rIndex + 1] + dataUnit[rIndex + 6];
|
|
1018 int tmp6 = dataUnit[rIndex + 1] - dataUnit[rIndex + 6];
|
|
1019 int tmp2 = dataUnit[rIndex + 2] + dataUnit[rIndex + 5];
|
|
1020 int tmp5 = dataUnit[rIndex + 2] - dataUnit[rIndex + 5];
|
|
1021 int tmp3 = dataUnit[rIndex + 3] + dataUnit[rIndex + 4];
|
|
1022 int tmp4 = dataUnit[rIndex + 3] - dataUnit[rIndex + 4];
|
|
1023
|
|
1024 /**
|
|
1025 * Even part per LL&M figure 1 --- note that published figure
|
|
1026 * is faulty; rotator 'sqrt(2)*c1' should be 'sqrt(2)*c6'.
|
|
1027 */
|
|
1028 int tmp10 = tmp0 + tmp3;
|
|
1029 int tmp13 = tmp0 - tmp3;
|
|
1030 int tmp11 = tmp1 + tmp2;
|
|
1031 int tmp12 = tmp1 - tmp2;
|
|
1032
|
|
1033 dataUnit[rIndex] = (tmp10 + tmp11) * 4;
|
|
1034 dataUnit[rIndex + 4] = (tmp10 - tmp11) * 4;
|
|
1035
|
|
1036 int z1 = (tmp12 + tmp13) * FIX_0_541196100;
|
|
1037 int n = z1 + (tmp13 * FIX_0_765366865) + 1024;
|
|
1038 dataUnit[rIndex + 2] = n >> 11;
|
|
1039 if ((n < 0) && ((n & 0x07FF) !is 0)) dataUnit[rIndex + 2]--;
|
|
1040 n = z1 + (tmp12 * (0 - FIX_1_847759065)) + 1024;
|
|
1041 dataUnit[rIndex + 6] = n >> 11;
|
|
1042 if ((n < 0) && ((n & 0x07FF) !is 0)) dataUnit[rIndex + 6]--;
|
|
1043
|
|
1044 /**
|
|
1045 * Odd part per figure 8 --- note paper omits factor of sqrt(2).
|
|
1046 * cK represents cos(K*pi/16).
|
|
1047 * i0..i3 in the paper are tmp4..tmp7 here.
|
|
1048 */
|
|
1049 z1 = tmp4 + tmp7;
|
|
1050 int z2 = tmp5 + tmp6;
|
|
1051 int z3 = tmp4 + tmp6;
|
|
1052 int z4 = tmp5 + tmp7;
|
|
1053 int z5 = (z3 + z4) * FIX_1_175875602; // sqrt(2) * c3
|
|
1054
|
|
1055 tmp4 *= FIX_0_298631336; // sqrt(2) * (-c1+c3+c5-c7)
|
|
1056 tmp5 *= FIX_2_053119869; // sqrt(2) * ( c1+c3-c5+c7)
|
|
1057 tmp6 *= FIX_3_072711026; // sqrt(2) * ( c1+c3+c5-c7)
|
|
1058 tmp7 *= FIX_1_501321110; // sqrt(2) * ( c1+c3-c5-c7)
|
|
1059 z1 *= 0 - FIX_0_899976223; // sqrt(2) * (c7-c3)
|
|
1060 z2 *= 0 - FIX_2_562915447; // sqrt(2) * (-c1-c3)
|
|
1061 z3 *= 0 - FIX_1_961570560; // sqrt(2) * (-c3-c5)
|
|
1062 z4 *= 0 - FIX_0_390180644; // sqrt(2) * (c5-c3)
|
|
1063
|
|
1064 z3 += z5;
|
|
1065 z4 += z5;
|
|
1066
|
|
1067 n = tmp4 + z1 + z3 + 1024;
|
|
1068 dataUnit[rIndex + 7] = n >> 11;
|
|
1069 if ((n < 0) && ((n & 0x07FF) !is 0)) dataUnit[rIndex + 7]--;
|
|
1070 n = tmp5 + z2 + z4 + 1024;
|
|
1071 dataUnit[rIndex + 5] = n >> 11;
|
|
1072 if ((n < 0) && ((n & 0x07FF) !is 0)) dataUnit[rIndex + 5]--;
|
|
1073 n = tmp6 + z2 + z3 + 1024;
|
|
1074 dataUnit[rIndex + 3] = n >> 11;
|
|
1075 if ((n < 0) && ((n & 0x07FF) !is 0)) dataUnit[rIndex + 3]--;
|
|
1076 n = tmp7 + z1 + z4 + 1024;
|
|
1077 dataUnit[rIndex + 1] = n >> 11;
|
|
1078 if ((n < 0) && ((n & 0x07FF) !is 0)) dataUnit[rIndex + 1]--;
|
|
1079 }
|
|
1080
|
|
1081 /**
|
|
1082 * Pass 2: process columns.
|
|
1083 * Note that we must descale the results by a factor of 8 is 2**3,
|
|
1084 * and also undo the PASS1_BITS scaling.
|
|
1085 */
|
|
1086 for (int col = 0; col < 8; col++) {
|
|
1087 int c0 = col;
|
|
1088 int c1 = col + 8;
|
|
1089 int c2 = col + 16;
|
|
1090 int c3 = col + 24;
|
|
1091 int c4 = col + 32;
|
|
1092 int c5 = col + 40;
|
|
1093 int c6 = col + 48;
|
|
1094 int c7 = col + 56;
|
|
1095 int tmp0 = dataUnit[c0] + dataUnit[c7];
|
|
1096 int tmp7 = dataUnit[c0] - dataUnit[c7];
|
|
1097 int tmp1 = dataUnit[c1] + dataUnit[c6];
|
|
1098 int tmp6 = dataUnit[c1] - dataUnit[c6];
|
|
1099 int tmp2 = dataUnit[c2] + dataUnit[c5];
|
|
1100 int tmp5 = dataUnit[c2] - dataUnit[c5];
|
|
1101 int tmp3 = dataUnit[c3] + dataUnit[c4];
|
|
1102 int tmp4 = dataUnit[c3] - dataUnit[c4];
|
|
1103
|
|
1104 /**
|
|
1105 * Even part per LL&M figure 1 --- note that published figure
|
|
1106 * is faulty; rotator 'sqrt(2)*c1' should be 'sqrt(2)*c6'.
|
|
1107 */
|
|
1108 int tmp10 = tmp0 + tmp3;
|
|
1109 int tmp13 = tmp0 - tmp3;
|
|
1110 int tmp11 = tmp1 + tmp2;
|
|
1111 int tmp12 = tmp1 - tmp2;
|
|
1112
|
|
1113 int n = tmp10 + tmp11 + 16;
|
|
1114 dataUnit[c0] = n >> 5;
|
|
1115 if ((n < 0) && ((n & 0x1F) !is 0)) dataUnit[c0]--;
|
|
1116 n = tmp10 - tmp11 + 16;
|
|
1117 dataUnit[c4] = n >> 5;
|
|
1118 if ((n < 0) && ((n & 0x1F) !is 0)) dataUnit[c4]--;
|
|
1119
|
|
1120 int z1 = (tmp12 + tmp13) * FIX_0_541196100;
|
|
1121 n = z1 + (tmp13 * FIX_0_765366865) + 131072;
|
|
1122 dataUnit[c2] = n >> 18;
|
|
1123 if ((n < 0) && ((n & 0x3FFFF) !is 0)) dataUnit[c2]--;
|
|
1124 n = z1 + (tmp12 * (0 - FIX_1_847759065)) + 131072;
|
|
1125 dataUnit[c6] = n >> 18;
|
|
1126 if ((n < 0) && ((n & 0x3FFFF) !is 0)) dataUnit[c6]--;
|
|
1127
|
|
1128 /**
|
|
1129 * Odd part per figure 8 --- note paper omits factor of sqrt(2).
|
|
1130 * cK represents cos(K*pi/16).
|
|
1131 * i0..i3 in the paper are tmp4..tmp7 here.
|
|
1132 */
|
|
1133 z1 = tmp4 + tmp7;
|
|
1134 int z2 = tmp5 + tmp6;
|
|
1135 int z3 = tmp4 + tmp6;
|
|
1136 int z4 = tmp5 + tmp7;
|
|
1137 int z5 = (z3 + z4) * FIX_1_175875602; // sqrt(2) * c3
|
|
1138
|
|
1139 tmp4 *= FIX_0_298631336; // sqrt(2) * (-c1+c3+c5-c7)
|
|
1140 tmp5 *= FIX_2_053119869; // sqrt(2) * ( c1+c3-c5+c7)
|
|
1141 tmp6 *= FIX_3_072711026; // sqrt(2) * ( c1+c3+c5-c7)
|
|
1142 tmp7 *= FIX_1_501321110; // sqrt(2) * ( c1+c3-c5-c7)
|
|
1143 z1 *= 0 - FIX_0_899976223; // sqrt(2) * (c7-c3)
|
|
1144 z2 *= 0 - FIX_2_562915447; // sqrt(2) * (-c1-c3)
|
|
1145 z3 *= 0 - FIX_1_961570560; // sqrt(2) * (-c3-c5)
|
|
1146 z4 *= 0 - FIX_0_390180644; // sqrt(2) * (c5-c3)
|
|
1147
|
|
1148 z3 += z5;
|
|
1149 z4 += z5;
|
|
1150
|
|
1151 n = tmp4 + z1 + z3 + 131072;
|
|
1152 dataUnit[c7] = n >> 18;
|
|
1153 if ((n < 0) && ((n & 0x3FFFF) !is 0)) dataUnit[c7]--;
|
|
1154 n = tmp5 + z2 + z4 + 131072;
|
|
1155 dataUnit[c5] = n >> 18;
|
|
1156 if ((n < 0) && ((n & 0x3FFFF) !is 0)) dataUnit[c5]--;
|
|
1157 n = tmp6 + z2 + z3 + 131072;
|
|
1158 dataUnit[c3] = n >> 18;
|
|
1159 if ((n < 0) && ((n & 0x3FFFF) !is 0)) dataUnit[c3]--;
|
|
1160 n = tmp7 + z1 + z4 + 131072;
|
|
1161 dataUnit[c1] = n >> 18;
|
|
1162 if ((n < 0) && ((n & 0x3FFFF) !is 0)) dataUnit[c1]--;
|
|
1163 }
|
|
1164 }
|
|
1165 void getAPP0() {
|
|
1166 JPEGAppn appn = new JPEGAppn(inputStream);
|
|
1167 if (!appn.verify()) {
|
|
1168 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1169 }
|
|
1170 }
|
|
1171 void getCOM() {
|
|
1172 new JPEGComment(inputStream);
|
|
1173 }
|
|
1174 void getDAC() {
|
|
1175 new JPEGArithmeticConditioningTable(inputStream);
|
|
1176 }
|
|
1177 void getDHT() {
|
|
1178 JPEGHuffmanTable dht = new JPEGHuffmanTable(inputStream);
|
|
1179 if (!dht.verify()) {
|
|
1180 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1181 }
|
|
1182 if (acHuffmanTables is null) {
|
|
1183 acHuffmanTables = new JPEGHuffmanTable[4];
|
|
1184 }
|
|
1185 if (dcHuffmanTables is null) {
|
|
1186 dcHuffmanTables = new JPEGHuffmanTable[4];
|
|
1187 }
|
|
1188 JPEGHuffmanTable[] dhtTables = dht.getAllTables();
|
|
1189 for (int i = 0; i < dhtTables.length; i++) {
|
|
1190 JPEGHuffmanTable dhtTable = dhtTables[i];
|
|
1191 if (dhtTable.getTableClass() is 0) {
|
|
1192 dcHuffmanTables[dhtTable.getTableIdentifier()] = dhtTable;
|
|
1193 } else {
|
|
1194 acHuffmanTables[dhtTable.getTableIdentifier()] = dhtTable;
|
|
1195 }
|
|
1196 }
|
|
1197 }
|
|
1198 void getDNL() {
|
|
1199 new JPEGRestartInterval(inputStream);
|
|
1200 }
|
|
1201 void getDQT() {
|
|
1202 JPEGQuantizationTable dqt = new JPEGQuantizationTable(inputStream);
|
|
1203 int[][] currentTables = quantizationTables;
|
|
1204 if (currentTables is null) {
|
|
1205 currentTables = new int[][](4);
|
|
1206 }
|
|
1207 int[] dqtTablesKeys = dqt.getQuantizationTablesKeys();
|
|
1208 int[][] dqtTablesValues = dqt.getQuantizationTablesValues();
|
|
1209 for (int i = 0; i < dqtTablesKeys.length; i++) {
|
|
1210 int index = dqtTablesKeys[i];
|
|
1211 currentTables[index] = dqtTablesValues[i];
|
|
1212 }
|
|
1213 quantizationTables = currentTables;
|
|
1214 }
|
|
1215 void getDRI() {
|
|
1216 JPEGRestartInterval dri = new JPEGRestartInterval(inputStream);
|
|
1217 if (!dri.verify()) {
|
|
1218 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1219 }
|
|
1220 restartInterval = dri.getRestartInterval();
|
|
1221 }
|
|
1222 void inverseDCT(int[] dataUnit) {
|
|
1223 for (int row = 0; row < 8; row++) {
|
|
1224 int rIndex = row * DCTSIZE;
|
|
1225 /**
|
|
1226 * Due to quantization, we will usually find that many of the input
|
|
1227 * coefficients are zero, especially the AC terms. We can exploit this
|
|
1228 * by short-circuiting the IDCT calculation for any row in which all
|
|
1229 * the AC terms are zero. In that case each output is equal to the
|
|
1230 * DC coefficient (with scale factor as needed).
|
|
1231 * With typical images and quantization tables, half or more of the
|
|
1232 * row DCT calculations can be simplified this way.
|
|
1233 */
|
|
1234 if (isZeroInRow(dataUnit, rIndex)) {
|
|
1235 int dcVal = dataUnit[rIndex] << 2;
|
|
1236 for (int i = rIndex + 7; i >= rIndex; i--) {
|
|
1237 dataUnit[i] = dcVal;
|
|
1238 }
|
|
1239 } else {
|
|
1240 /**
|
|
1241 * Even part: reverse the even part of the forward DCT.
|
|
1242 * The rotator is sqrt(2)*c(-6).
|
|
1243 */
|
|
1244 int z2 = dataUnit[rIndex + 2];
|
|
1245 int z3 = dataUnit[rIndex + 6];
|
|
1246 int z1 = (z2 + z3) * FIX_0_541196100;
|
|
1247 int tmp2 = z1 + (z3 * (0 - FIX_1_847759065));
|
|
1248 int tmp3 = z1 + (z2 * FIX_0_765366865);
|
|
1249 int tmp0 = (dataUnit[rIndex] + dataUnit[rIndex + 4]) << 13;
|
|
1250 int tmp1 = (dataUnit[rIndex] - dataUnit[rIndex + 4]) << 13;
|
|
1251 int tmp10 = tmp0 + tmp3;
|
|
1252 int tmp13 = tmp0 - tmp3;
|
|
1253 int tmp11 = tmp1 + tmp2;
|
|
1254 int tmp12 = tmp1 - tmp2;
|
|
1255 /**
|
|
1256 * Odd part per figure 8; the matrix is unitary and hence its
|
|
1257 * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
|
|
1258 */
|
|
1259 tmp0 = dataUnit[rIndex + 7];
|
|
1260 tmp1 = dataUnit[rIndex + 5];
|
|
1261 tmp2 = dataUnit[rIndex + 3];
|
|
1262 tmp3 = dataUnit[rIndex + 1];
|
|
1263 z1 = tmp0 + tmp3;
|
|
1264 z2 = tmp1 + tmp2;
|
|
1265 z3 = tmp0 + tmp2;
|
|
1266 int z4 = tmp1 + tmp3;
|
|
1267 int z5 = (z3 + z4) * FIX_1_175875602; /* sqrt(2) * c3 */
|
|
1268
|
|
1269 tmp0 *= FIX_0_298631336; /* sqrt(2) * (-c1+c3+c5-c7) */
|
|
1270 tmp1 *= FIX_2_053119869; /* sqrt(2) * ( c1+c3-c5+c7) */
|
|
1271 tmp2 *= FIX_3_072711026; /* sqrt(2) * ( c1+c3+c5-c7) */
|
|
1272 tmp3 *= FIX_1_501321110; /* sqrt(2) * ( c1+c3-c5-c7) */
|
|
1273 z1 *= 0 - FIX_0_899976223; /* sqrt(2) * (c7-c3) */
|
|
1274 z2 *= 0 - FIX_2_562915447; /* sqrt(2) * (-c1-c3) */
|
|
1275 z3 *= 0 - FIX_1_961570560; /* sqrt(2) * (-c3-c5) */
|
|
1276 z4 *= 0 - FIX_0_390180644; /* sqrt(2) * (c5-c3) */
|
|
1277
|
|
1278 z3 += z5;
|
|
1279 z4 += z5;
|
|
1280 tmp0 += z1 + z3;
|
|
1281 tmp1 += z2 + z4;
|
|
1282 tmp2 += z2 + z3;
|
|
1283 tmp3 += z1 + z4;
|
|
1284
|
|
1285 dataUnit[rIndex] = (tmp10 + tmp3 + 1024) >> 11;
|
|
1286 dataUnit[rIndex + 7] = (tmp10 - tmp3 + 1024) >> 11;
|
|
1287 dataUnit[rIndex + 1] = (tmp11 + tmp2 + 1024) >> 11;
|
|
1288 dataUnit[rIndex + 6] = (tmp11 - tmp2 + 1024) >> 11;
|
|
1289 dataUnit[rIndex + 2] = (tmp12 + tmp1 + 1024) >> 11;
|
|
1290 dataUnit[rIndex + 5] = (tmp12 - tmp1 + 1024) >> 11;
|
|
1291 dataUnit[rIndex + 3] = (tmp13 + tmp0 + 1024) >> 11;
|
|
1292 dataUnit[rIndex + 4] = (tmp13 - tmp0 + 1024) >> 11;
|
|
1293 }
|
|
1294 }
|
|
1295 /**
|
|
1296 * Pass 2: process columns.
|
|
1297 * Note that we must descale the results by a factor of 8 is 2**3,
|
|
1298 * and also undo the PASS1_BITS scaling.
|
|
1299 */
|
|
1300 for (int col = 0; col < 8; col++) {
|
|
1301 int c0 = col;
|
|
1302 int c1 = col + 8;
|
|
1303 int c2 = col + 16;
|
|
1304 int c3 = col + 24;
|
|
1305 int c4 = col + 32;
|
|
1306 int c5 = col + 40;
|
|
1307 int c6 = col + 48;
|
|
1308 int c7 = col + 56;
|
|
1309 if (isZeroInColumn(dataUnit, col)) {
|
|
1310 int dcVal = (dataUnit[c0] + 16) >> 5;
|
|
1311 dataUnit[c0] = dcVal;
|
|
1312 dataUnit[c1] = dcVal;
|
|
1313 dataUnit[c2] = dcVal;
|
|
1314 dataUnit[c3] = dcVal;
|
|
1315 dataUnit[c4] = dcVal;
|
|
1316 dataUnit[c5] = dcVal;
|
|
1317 dataUnit[c6] = dcVal;
|
|
1318 dataUnit[c7] = dcVal;
|
|
1319 } else {
|
|
1320 /**
|
|
1321 * Even part: reverse the even part of the forward DCT.
|
|
1322 * The rotator is sqrt(2)*c(-6).
|
|
1323 */
|
|
1324 int z0 = dataUnit[c0];
|
|
1325 int z2 = dataUnit[c2];
|
|
1326 int z3 = dataUnit[c6];
|
|
1327 int z4 = dataUnit[c4];
|
|
1328 int z1 = (z2 + z3) * FIX_0_541196100;
|
|
1329 int tmp2 = z1 + (z3 * (0 - FIX_1_847759065));
|
|
1330 int tmp3 = z1 + (z2 * FIX_0_765366865);
|
|
1331 int tmp0 = (z0 + z4) << 13;
|
|
1332 int tmp1 = (z0 - z4) << 13;
|
|
1333 int tmp10 = tmp0 + tmp3;
|
|
1334 int tmp13 = tmp0 - tmp3;
|
|
1335 int tmp11 = tmp1 + tmp2;
|
|
1336 int tmp12 = tmp1 - tmp2;
|
|
1337 /**
|
|
1338 * Odd part per figure 8; the matrix is unitary and hence its
|
|
1339 * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
|
|
1340 */
|
|
1341 tmp0 = dataUnit[c7];
|
|
1342 tmp1 = dataUnit[c5];
|
|
1343 tmp2 = dataUnit[c3];
|
|
1344 tmp3 = dataUnit[c1];
|
|
1345 z1 = tmp0 + tmp3;
|
|
1346 z2 = tmp1 + tmp2;
|
|
1347 z3 = tmp0 + tmp2;
|
|
1348 z4 = tmp1 + tmp3;
|
|
1349 z0 = (z3 + z4) * FIX_1_175875602; /* sqrt(2) * c3 */
|
|
1350
|
|
1351 tmp0 *= FIX_0_298631336; /* sqrt(2) * (-c1+c3+c5-c7) */
|
|
1352 tmp1 *= FIX_2_053119869; /* sqrt(2) * ( c1+c3-c5+c7) */
|
|
1353 tmp2 *= FIX_3_072711026; /* sqrt(2) * ( c1+c3+c5-c7) */
|
|
1354 tmp3 *= FIX_1_501321110; /* sqrt(2) * ( c1+c3-c5-c7) */
|
|
1355 z1 *= 0 - FIX_0_899976223; /* sqrt(2) * (c7-c3) */
|
|
1356 z2 *= 0 - FIX_2_562915447; /* sqrt(2) * (-c1-c3) */
|
|
1357 z3 *= 0 - FIX_1_961570560; /* sqrt(2) * (-c3-c5) */
|
|
1358 z4 *= 0 - FIX_0_390180644; /* sqrt(2) * (c5-c3) */
|
|
1359
|
|
1360 z3 += z0;
|
|
1361 z4 += z0;
|
|
1362
|
|
1363 tmp0 += z1 + z3;
|
|
1364 tmp1 += z2 + z4;
|
|
1365 tmp2 += z2 + z3;
|
|
1366 tmp3 += z1 + z4;
|
|
1367
|
|
1368 /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
|
|
1369 dataUnit[c0] = (tmp10 + tmp3 + 131072) >> 18;
|
|
1370 dataUnit[c7] = (tmp10 - tmp3 + 131072) >> 18;
|
|
1371 dataUnit[c1] = (tmp11 + tmp2 + 131072) >> 18;
|
|
1372 dataUnit[c6] = (tmp11 - tmp2 + 131072) >> 18;
|
|
1373 dataUnit[c2] = (tmp12 + tmp1 + 131072) >> 18;
|
|
1374 dataUnit[c5] = (tmp12 - tmp1 + 131072) >> 18;
|
|
1375 dataUnit[c3] = (tmp13 + tmp0 + 131072) >> 18;
|
|
1376 dataUnit[c4] = (tmp13 - tmp0 + 131072) >> 18;
|
|
1377 }
|
|
1378 }
|
|
1379 }
|
|
1380 override bool isFileFormat(LEDataInputStream stream) {
|
|
1381 try {
|
|
1382 JPEGStartOfImage soi = new JPEGStartOfImage(stream);
|
|
1383 stream.unread(soi.reference);
|
|
1384 return soi.verify(); // we no longer check for appN
|
|
1385 } catch (Exception e) {
|
|
1386 return false;
|
|
1387 }
|
|
1388 }
|
|
1389 bool isZeroInColumn(int[] dataUnit, int col) {
|
|
1390 return dataUnit[col + 8] is 0 && dataUnit[col + 16] is 0
|
|
1391 && dataUnit[col + 24] is 0 && dataUnit[col + 32] is 0
|
|
1392 && dataUnit[col + 40] is 0 && dataUnit[col + 48] is 0
|
|
1393 && dataUnit[col + 56] is 0;
|
|
1394 }
|
|
1395 bool isZeroInRow(int[] dataUnit, int rIndex) {
|
|
1396 return dataUnit[rIndex + 1] is 0 && dataUnit[rIndex + 2] is 0
|
|
1397 && dataUnit[rIndex + 3] is 0 && dataUnit[rIndex + 4] is 0
|
|
1398 && dataUnit[rIndex + 5] is 0 && dataUnit[rIndex + 6] is 0
|
|
1399 && dataUnit[rIndex + 7] is 0;
|
|
1400 }
|
|
1401 override ImageData[] loadFromByteStream() {
|
|
1402 //TEMPORARY CODE
|
|
1403 //PORTING_FIXME
|
|
1404 if (/+System.getProperty("org.eclipse.swt.internal.image.JPEGFileFormat_3.2") is null+/ true ) {
|
|
1405 return JPEGDecoder.loadFromByteStream(inputStream, loader);
|
|
1406 }
|
|
1407 JPEGStartOfImage soi = new JPEGStartOfImage(inputStream);
|
|
1408 if (!soi.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1409 restartInterval = 0;
|
|
1410
|
|
1411 /* Process the tables preceding the frame header. */
|
|
1412 processTables();
|
|
1413
|
|
1414 /* Start of Frame. */
|
|
1415 frameHeader = new JPEGFrameHeader(inputStream);
|
|
1416 if (!frameHeader.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1417 imageWidth = frameHeader.getSamplesPerLine();
|
|
1418 imageHeight = frameHeader.getNumberOfLines();
|
|
1419 maxH = frameHeader.getMaxHFactor();
|
|
1420 maxV = frameHeader.getMaxVFactor();
|
|
1421 int mcuWidth = maxH * DCTSIZE;
|
|
1422 int mcuHeight = maxV * DCTSIZE;
|
|
1423 interleavedMcuCols = (imageWidth + mcuWidth - 1) / mcuWidth;
|
|
1424 interleavedMcuRows = (imageHeight + mcuHeight - 1) / mcuHeight;
|
|
1425 progressive = frameHeader.isProgressive();
|
|
1426 samplePrecision = frameHeader.getSamplePrecision();
|
|
1427 nComponents = frameHeader.getNumberOfImageComponents();
|
|
1428 frameComponents = frameHeader.componentParameters;
|
|
1429 componentIds = frameHeader.componentIdentifiers;
|
|
1430 imageComponents = new byte[][](nComponents);
|
|
1431 if (progressive) {
|
|
1432 // Progressive jpeg: need to keep all of the data units.
|
|
1433 dataUnits = new int[][][](nComponents);
|
|
1434 } else {
|
|
1435 // Sequential jpeg: only need one data unit.
|
|
1436 dataUnit = new int[8 * 8];
|
|
1437 }
|
|
1438 for (int i = 0; i < nComponents; i++) {
|
|
1439 int[] frameComponent = frameComponents[componentIds[i]];
|
|
1440 int bufferSize = frameComponent[CW] * frameComponent[CH];
|
|
1441 imageComponents[i] = new byte[bufferSize];
|
|
1442 if (progressive) {
|
|
1443 dataUnits[i] = new int[][](bufferSize);
|
|
1444 }
|
|
1445 }
|
|
1446
|
|
1447 /* Process the tables preceding the scan header. */
|
|
1448 processTables();
|
|
1449
|
|
1450 /* Start of Scan. */
|
|
1451 scanHeader = new JPEGScanHeader(inputStream);
|
|
1452 if (!scanHeader.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1453
|
|
1454 /* Process scan(s) and further tables until EOI. */
|
|
1455 int progressiveScanCount = 0;
|
|
1456 bool done = false;
|
|
1457 while(!done) {
|
|
1458 resetInputBuffer();
|
|
1459 precedingDCs = new int[4];
|
|
1460 decodeScan();
|
|
1461 if (progressive && loader.hasListeners()) {
|
|
1462 ImageData imageData = createImageData();
|
|
1463 loader.notifyListeners(new ImageLoaderEvent(loader, imageData, progressiveScanCount, false));
|
|
1464 progressiveScanCount++;
|
|
1465 }
|
|
1466
|
|
1467 /* Unread any buffered data before looking for tables again. */
|
|
1468 int delta = 512 - bufferCurrentPosition - 1;
|
|
1469 if (delta > 0) {
|
|
1470 byte[] unreadBuffer = new byte[delta];
|
|
1471 System.arraycopy(dataBuffer, bufferCurrentPosition + 1, unreadBuffer, 0, delta);
|
|
1472 try {
|
|
1473 inputStream.unread(unreadBuffer);
|
|
1474 } catch (IOException e) {
|
|
1475 SWT.error(SWT.ERROR_IO, e);
|
|
1476 }
|
|
1477 }
|
|
1478
|
|
1479 /* Process the tables preceding the next scan header. */
|
|
1480 JPEGSegment jpegSegment = processTables();
|
|
1481 if (jpegSegment is null || jpegSegment.getSegmentMarker() is EOI) {
|
|
1482 done = true;
|
|
1483 } else {
|
|
1484 scanHeader = new JPEGScanHeader(inputStream);
|
|
1485 if (!scanHeader.verify()) SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1486 }
|
|
1487 }
|
|
1488
|
|
1489 if (progressive) {
|
|
1490 for (int ymcu = 0; ymcu < interleavedMcuRows; ymcu++) {
|
|
1491 for (int xmcu = 0; xmcu < interleavedMcuCols; xmcu++) {
|
|
1492 for (int iComp = 0; iComp < nComponents; iComp++) {
|
|
1493 int[] frameComponent = frameComponents[componentIds[iComp]];
|
|
1494 int hi = frameComponent[HI];
|
|
1495 int vi = frameComponent[VI];
|
|
1496 int compWidth = frameComponent[CW];
|
|
1497 for (int ivi = 0; ivi < vi; ivi++) {
|
|
1498 for (int ihi = 0; ihi < hi; ihi++) {
|
|
1499 int index = (ymcu * vi + ivi) * compWidth + xmcu * hi + ihi;
|
|
1500 dataUnit = dataUnits[iComp][index];
|
|
1501 dequantize(dataUnit, iComp);
|
|
1502 inverseDCT(dataUnit);
|
|
1503 storeData(dataUnit, iComp, xmcu, ymcu, hi, ihi, vi, ivi);
|
|
1504 }
|
|
1505 }
|
|
1506 }
|
|
1507 }
|
|
1508 }
|
|
1509 dataUnits = null; // release memory
|
|
1510 }
|
|
1511 ImageData imageData = createImageData();
|
|
1512 if (progressive && loader.hasListeners()) {
|
|
1513 loader.notifyListeners(new ImageLoaderEvent(loader, imageData, progressiveScanCount, true));
|
|
1514 }
|
|
1515 return [imageData];
|
|
1516 }
|
|
1517 ImageData createImageData() {
|
|
1518 return ImageData.internal_new(
|
|
1519 imageWidth,
|
|
1520 imageHeight,
|
|
1521 nComponents * samplePrecision,
|
|
1522 setUpPalette(),
|
|
1523 nComponents is 1 ? 4 : 1,
|
|
1524 decodeImageComponents(),
|
|
1525 0,
|
|
1526 null,
|
|
1527 null,
|
|
1528 -1,
|
|
1529 -1,
|
|
1530 SWT.IMAGE_JPEG,
|
|
1531 0,
|
|
1532 0,
|
|
1533 0,
|
|
1534 0);
|
|
1535 }
|
|
1536 int nextBit() {
|
|
1537 if (currentBitCount !is 0) {
|
|
1538 currentBitCount--;
|
|
1539 currentByte *= 2;
|
|
1540 if (currentByte > 255) {
|
|
1541 currentByte -= 256;
|
|
1542 return 1;
|
|
1543 } else {
|
|
1544 return 0;
|
|
1545 }
|
|
1546 }
|
|
1547 bufferCurrentPosition++;
|
|
1548 if (bufferCurrentPosition >= 512) {
|
|
1549 resetInputBuffer();
|
|
1550 bufferCurrentPosition = 0;
|
|
1551 }
|
|
1552 currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
|
|
1553 currentBitCount = 8;
|
|
1554 byte nextByte;
|
|
1555 if (bufferCurrentPosition is 511) {
|
|
1556 resetInputBuffer();
|
|
1557 currentBitCount = 8;
|
|
1558 nextByte = dataBuffer[0];
|
|
1559 } else {
|
|
1560 nextByte = dataBuffer[bufferCurrentPosition + 1];
|
|
1561 }
|
|
1562 if (currentByte is 0xFF) {
|
|
1563 if (nextByte is 0) {
|
|
1564 bufferCurrentPosition ++;
|
|
1565 currentBitCount--;
|
|
1566 currentByte *= 2;
|
|
1567 if (currentByte > 255) {
|
|
1568 currentByte -= 256;
|
|
1569 return 1;
|
|
1570 } else {
|
|
1571 return 0;
|
|
1572 }
|
|
1573 } else {
|
|
1574 if ((nextByte & 0xFF) + 0xFF00 is DNL) {
|
|
1575 getDNL();
|
|
1576 return 0;
|
|
1577 } else {
|
|
1578 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1579 return 0;
|
|
1580 }
|
|
1581 }
|
|
1582 } else {
|
|
1583 currentBitCount--;
|
|
1584 currentByte *= 2;
|
|
1585 if (currentByte > 255) {
|
|
1586 currentByte -= 256;
|
|
1587 return 1;
|
|
1588 } else {
|
|
1589 return 0;
|
|
1590 }
|
|
1591 }
|
|
1592 }
|
|
1593 void processRestartInterval() {
|
|
1594 do {
|
|
1595 bufferCurrentPosition++;
|
|
1596 if (bufferCurrentPosition > 511) {
|
|
1597 resetInputBuffer();
|
|
1598 bufferCurrentPosition = 0;
|
|
1599 }
|
|
1600 currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
|
|
1601 } while (currentByte !is 0xFF);
|
|
1602 while (currentByte is 0xFF) {
|
|
1603 bufferCurrentPosition++;
|
|
1604 if (bufferCurrentPosition > 511) {
|
|
1605 resetInputBuffer();
|
|
1606 bufferCurrentPosition = 0;
|
|
1607 }
|
|
1608 currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
|
|
1609 }
|
|
1610 if (currentByte !is ((RST0 + nextRestartNumber) & 0xFF)) {
|
|
1611 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1612 }
|
|
1613 bufferCurrentPosition++;
|
|
1614 if (bufferCurrentPosition > 511) {
|
|
1615 resetInputBuffer();
|
|
1616 bufferCurrentPosition = 0;
|
|
1617 }
|
|
1618 currentByte = dataBuffer[bufferCurrentPosition] & 0xFF;
|
|
1619 currentBitCount = 8;
|
|
1620 restartsToGo = restartInterval;
|
|
1621 nextRestartNumber = (nextRestartNumber + 1) & 0x7;
|
|
1622 precedingDCs = new int[4];
|
|
1623 eobrun = 0;
|
|
1624 }
|
|
1625 /* Process all markers until a frame header, scan header, or EOI is found. */
|
|
1626 JPEGSegment processTables() {
|
|
1627 while (true) {
|
|
1628 JPEGSegment jpegSegment = seekUnspecifiedMarker(inputStream);
|
|
1629 if (jpegSegment is null) return null;
|
|
1630 JPEGFrameHeader sof = new JPEGFrameHeader(jpegSegment.reference);
|
|
1631 if (sof.verify()) {
|
|
1632 return jpegSegment;
|
|
1633 }
|
|
1634 int marker = jpegSegment.getSegmentMarker();
|
|
1635 switch (marker) {
|
|
1636 case SOI: // there should only be one SOI per file
|
|
1637 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1638 case EOI:
|
|
1639 case SOS:
|
|
1640 return jpegSegment;
|
|
1641 case DQT:
|
|
1642 getDQT();
|
|
1643 break;
|
|
1644 case DHT:
|
|
1645 getDHT();
|
|
1646 break;
|
|
1647 case DAC:
|
|
1648 getDAC();
|
|
1649 break;
|
|
1650 case DRI:
|
|
1651 getDRI();
|
|
1652 break;
|
|
1653 case APP0:
|
|
1654 getAPP0();
|
|
1655 break;
|
|
1656 case COM:
|
|
1657 getCOM();
|
|
1658 break;
|
|
1659 default:
|
|
1660 skipSegmentFrom(inputStream);
|
|
1661
|
|
1662 }
|
|
1663 }
|
|
1664 }
|
|
1665 void quantizeData(int[] dataUnit, int iComp) {
|
|
1666 int[] qTable = quantizationTables[frameComponents[componentIds[iComp]][TQI]];
|
|
1667 for (int i = 0; i < dataUnit.length; i++) {
|
|
1668 int zzIndex = ZigZag8x8[i];
|
|
1669 int data = dataUnit[zzIndex];
|
|
1670 int absData = data < 0 ? 0 - data : data;
|
|
1671 int qValue = qTable[i];
|
|
1672 int q2 = qValue >> 1;
|
|
1673 absData += q2;
|
|
1674 if (absData < qValue) {
|
|
1675 dataUnit[zzIndex] = 0;
|
|
1676 } else {
|
|
1677 absData /= qValue;
|
|
1678 if (data >= 0) {
|
|
1679 dataUnit[zzIndex] = absData;
|
|
1680 } else {
|
|
1681 dataUnit[zzIndex] = 0 - absData;
|
|
1682 }
|
|
1683 }
|
|
1684 }
|
|
1685 }
|
|
1686 int receive(int nBits) {
|
|
1687 int v = 0;
|
|
1688 for (int i = 0; i < nBits; i++) {
|
|
1689 v = v * 2 + nextBit();
|
|
1690 }
|
|
1691 return v;
|
|
1692 }
|
|
1693 void resetInputBuffer() {
|
|
1694 if (dataBuffer is null) {
|
|
1695 dataBuffer = new byte[512];
|
|
1696 }
|
|
1697 try {
|
|
1698 inputStream.read(dataBuffer);
|
|
1699 } catch (IOException e) {
|
|
1700 SWT.error(SWT.ERROR_IO, e);
|
|
1701 }
|
|
1702 currentBitCount = 0;
|
|
1703 bufferCurrentPosition = -1;
|
|
1704 }
|
|
1705 void resetOutputBuffer() {
|
|
1706 if (dataBuffer is null) {
|
|
1707 dataBuffer = new byte[512];
|
|
1708 } else {
|
|
1709 try {
|
|
1710 outputStream.write(dataBuffer, 0, bufferCurrentPosition);
|
|
1711 } catch (IOException e) {
|
|
1712 SWT.error(SWT.ERROR_IO, e);
|
|
1713 }
|
|
1714 }
|
|
1715 bufferCurrentPosition = 0;
|
|
1716 }
|
|
1717 static JPEGSegment seekUnspecifiedMarker(LEDataInputStream byteStream) {
|
|
1718 byte[] byteArray = new byte[2];
|
|
1719 try {
|
|
1720 while (true) {
|
|
1721 if (byteStream.read(byteArray, 0, 1) !is 1) return null;
|
|
1722 if (byteArray[0] is cast(byte) 0xFF) {
|
|
1723 if (byteStream.read(byteArray, 1, 1) !is 1) return null;
|
|
1724 if (byteArray[1] !is cast(byte) 0xFF && byteArray[1] !is 0) {
|
|
1725 byteStream.unread(byteArray);
|
|
1726 return new JPEGSegment(byteArray);
|
|
1727 }
|
|
1728 }
|
|
1729 }
|
|
1730 } catch (IOException e) {
|
|
1731 SWT.error(SWT.ERROR_IO, e);
|
|
1732 }
|
|
1733 return null;
|
|
1734 }
|
|
1735 PaletteData setUpPalette() {
|
|
1736 if (nComponents is 1) {
|
|
1737 RGB[] entries = new RGB[256];
|
|
1738 for (int i = 0; i < 256; i++) {
|
|
1739 entries[i] = new RGB(i, i, i);
|
|
1740 }
|
|
1741 return new PaletteData(entries);
|
|
1742 }
|
|
1743 return new PaletteData(0xFF, 0xFF00, 0xFF0000);
|
|
1744 }
|
|
1745 static void skipSegmentFrom(LEDataInputStream byteStream) {
|
|
1746 try {
|
|
1747 byte[] byteArray = new byte[4];
|
|
1748 JPEGSegment jpegSegment = new JPEGSegment(byteArray);
|
|
1749
|
|
1750 if (byteStream.read(byteArray) !is byteArray.length) {
|
|
1751 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1752 }
|
|
1753 if (!(byteArray[0] is -1 && byteArray[1] !is 0 && byteArray[1] !is -1)) {
|
|
1754 SWT.error(SWT.ERROR_INVALID_IMAGE);
|
|
1755 }
|
|
1756 int delta = jpegSegment.getSegmentLength() - 2;
|
|
1757 byteStream.skip(delta);
|
|
1758 } catch (Exception e) {
|
|
1759 SWT.error(SWT.ERROR_IO, e);
|
|
1760 }
|
|
1761 }
|
|
1762 void storeData(int[] dataUnit, int iComp, int xmcu, int ymcu, int hi, int ihi, int vi, int ivi) {
|
|
1763 byte[] compImage = imageComponents[iComp];
|
|
1764 int[] frameComponent = frameComponents[componentIds[iComp]];
|
|
1765 int compWidth = frameComponent[CW];
|
|
1766 int destIndex = ((ymcu * vi + ivi) * compWidth * DCTSIZE) + ((xmcu * hi + ihi) * DCTSIZE);
|
|
1767 int srcIndex = 0;
|
|
1768 for (int i = 0; i < DCTSIZE; i++) {
|
|
1769 for (int col = 0; col < DCTSIZE; col++) {
|
|
1770 int x = dataUnit[srcIndex] + 128;
|
|
1771 if (x < 0) {
|
|
1772 x = 0;
|
|
1773 } else {
|
|
1774 if (x > 255) x = 255;
|
|
1775 }
|
|
1776 compImage[destIndex + col] = cast(byte)x;
|
|
1777 srcIndex++;
|
|
1778 }
|
|
1779 destIndex += compWidth;
|
|
1780 }
|
|
1781 }
|
|
1782 override void unloadIntoByteStream(ImageLoader loader) {
|
|
1783 ImageData image = loader.data[0];
|
|
1784 if (!(new JPEGStartOfImage()).writeToStream(outputStream)) {
|
|
1785 SWT.error(SWT.ERROR_IO);
|
|
1786 }
|
|
1787 JPEGAppn appn = new JPEGAppn([cast(byte)0xFF, cast(byte)0xE0, 0, 0x10, 0x4A, 0x46, 0x49, 0x46, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0]);
|
|
1788 if (!appn.writeToStream(outputStream)) {
|
|
1789 SWT.error(SWT.ERROR_IO);
|
|
1790 }
|
|
1791 quantizationTables = new int[][](4);
|
|
1792 JPEGQuantizationTable chromDQT = JPEGQuantizationTable.defaultChrominanceTable();
|
|
1793 chromDQT.scaleBy(encoderQFactor);
|
|
1794 int[] jpegDQTKeys = chromDQT.getQuantizationTablesKeys();
|
|
1795 int[][] jpegDQTValues = chromDQT.getQuantizationTablesValues();
|
|
1796 for (int i = 0; i < jpegDQTKeys.length; i++) {
|
|
1797 quantizationTables[jpegDQTKeys[i]] = jpegDQTValues[i];
|
|
1798 }
|
|
1799 JPEGQuantizationTable lumDQT = JPEGQuantizationTable.defaultLuminanceTable();
|
|
1800 lumDQT.scaleBy(encoderQFactor);
|
|
1801 jpegDQTKeys = lumDQT.getQuantizationTablesKeys();
|
|
1802 jpegDQTValues = lumDQT.getQuantizationTablesValues();
|
|
1803 for (int i = 0; i < jpegDQTKeys.length; i++) {
|
|
1804 quantizationTables[jpegDQTKeys[i]] = jpegDQTValues[i];
|
|
1805 }
|
|
1806 if (!lumDQT.writeToStream(outputStream)) {
|
|
1807 SWT.error(SWT.ERROR_IO);
|
|
1808 }
|
|
1809 if (!chromDQT.writeToStream(outputStream)) {
|
|
1810 SWT.error(SWT.ERROR_IO);
|
|
1811 }
|
|
1812 int frameLength, scanLength, precision;
|
|
1813 int[][] frameParams, scanParams;
|
|
1814 if (image.depth is 1) {
|
|
1815 frameLength = 11;
|
|
1816 frameParams = new int[][](1);
|
|
1817 frameParams[0] = [1, 1, 1, 0, 0];
|
|
1818 scanParams = new int[][](1);
|
|
1819 scanParams[0] = [0, 0];
|
|
1820 scanLength = 8;
|
|
1821 nComponents = 1;
|
|
1822 precision = 1;
|
|
1823 } else {
|
|
1824 frameLength = 17;
|
|
1825 frameParams = new int[][](3);
|
|
1826 frameParams[0] = [0, 2, 2, 0, 0];
|
|
1827 frameParams[1] = [1, 1, 1, 0, 0];
|
|
1828 frameParams[2] = [1, 1, 1, 0, 0];
|
|
1829 scanParams = new int[][](3);
|
|
1830 scanParams[0] = [0, 0];
|
|
1831 scanParams[1] = [1, 1];
|
|
1832 scanParams[2] = [1, 1];
|
|
1833 scanLength = 12;
|
|
1834 nComponents = 3;
|
|
1835 precision = 8;
|
|
1836 }
|
|
1837 imageWidth = image.width;
|
|
1838 imageHeight = image.height;
|
|
1839 frameHeader = new JPEGFrameHeader(new byte[19]);
|
|
1840 frameHeader.setSegmentMarker(SOF0);
|
|
1841 frameHeader.setSegmentLength(frameLength);
|
|
1842 frameHeader.setSamplePrecision(precision);
|
|
1843 frameHeader.setSamplesPerLine(imageWidth);
|
|
1844 frameHeader.setNumberOfLines(imageHeight);
|
|
1845 frameHeader.setNumberOfImageComponents(nComponents);
|
|
1846 frameHeader.componentParameters = frameParams;
|
|
1847 frameHeader.componentIdentifiers = [0, 1, 2];
|
|
1848 frameHeader.initializeContents();
|
|
1849 if (!frameHeader.writeToStream(outputStream)) {
|
|
1850 SWT.error(SWT.ERROR_IO);
|
|
1851 }
|
|
1852 frameComponents = frameParams;
|
|
1853 componentIds = frameHeader.componentIdentifiers;
|
|
1854 maxH = frameHeader.getMaxHFactor();
|
|
1855 maxV = frameHeader.getMaxVFactor();
|
|
1856 int mcuWidth = maxH * DCTSIZE;
|
|
1857 int mcuHeight = maxV * DCTSIZE;
|
|
1858 interleavedMcuCols = (imageWidth + mcuWidth - 1) / mcuWidth;
|
|
1859 interleavedMcuRows = (imageHeight + mcuHeight - 1) / mcuHeight;
|
|
1860 acHuffmanTables = new JPEGHuffmanTable[4];
|
|
1861 dcHuffmanTables = new JPEGHuffmanTable[4];
|
|
1862 JPEGHuffmanTable[] dhtTables = [
|
|
1863 JPEGHuffmanTable.getDefaultDCLuminanceTable(),
|
|
1864 JPEGHuffmanTable.getDefaultDCChrominanceTable(),
|
|
1865 JPEGHuffmanTable.getDefaultACLuminanceTable(),
|
|
1866 JPEGHuffmanTable.getDefaultACChrominanceTable()
|
|
1867 ];
|
|
1868 for (int i = 0; i < dhtTables.length; i++) {
|
|
1869 JPEGHuffmanTable dhtTable = dhtTables[i];
|
|
1870 if (!dhtTable.writeToStream(outputStream)) {
|
|
1871 SWT.error(SWT.ERROR_IO);
|
|
1872 }
|
|
1873 JPEGHuffmanTable[] allTables = dhtTable.getAllTables();
|
|
1874 for (int j = 0; j < allTables.length; j++) {
|
|
1875 JPEGHuffmanTable huffmanTable = allTables[j];
|
|
1876 if (huffmanTable.getTableClass() is 0) {
|
|
1877 dcHuffmanTables[huffmanTable.getTableIdentifier()] = huffmanTable;
|
|
1878 } else {
|
|
1879 acHuffmanTables[huffmanTable.getTableIdentifier()] = huffmanTable;
|
|
1880 }
|
|
1881 }
|
|
1882 }
|
|
1883 precedingDCs = new int[4];
|
|
1884 scanHeader = new JPEGScanHeader(new byte[14]);
|
|
1885 scanHeader.setSegmentMarker(SOS);
|
|
1886 scanHeader.setSegmentLength(scanLength);
|
|
1887 scanHeader.setNumberOfImageComponents(nComponents);
|
|
1888 scanHeader.setStartOfSpectralSelection(0);
|
|
1889 scanHeader.setEndOfSpectralSelection(63);
|
|
1890 scanHeader.componentParameters = scanParams;
|
|
1891 scanHeader.initializeContents();
|
|
1892 if (!scanHeader.writeToStream(outputStream)) {
|
|
1893 SWT.error(SWT.ERROR_IO);
|
|
1894 }
|
|
1895 convertImageToYCbCr(image);
|
|
1896 resetOutputBuffer();
|
|
1897 currentByte = 0;
|
|
1898 currentBitCount = 0;
|
|
1899 encodeScan();
|
|
1900 if (!(new JPEGEndOfImage()).writeToStream(outputStream)) {
|
|
1901 SWT.error(SWT.ERROR_IO);
|
|
1902 }
|
|
1903 }
|
|
1904 }
|