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annotate dwt/internal/image/JPEGFrameHeader.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.internal.image;
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12
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13
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14 import dwt.DWT;
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15
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16 final class JPEGFrameHeader : JPEGVariableSizeSegment {
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17 int maxVFactor;
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18 int maxHFactor;
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19 public int[] componentIdentifiers;
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20 public int[][] componentParameters;
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21
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22 public JPEGFrameHeader(byte[] reference) {
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23 super(reference);
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24 }
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25
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26 public JPEGFrameHeader(LEDataInputStream byteStream) {
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27 super(byteStream);
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28 initializeComponentParameters();
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29 }
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30
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31 public int getSamplePrecision() {
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32 return reference[4] & 0xFF;
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33 }
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34
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35 public int getNumberOfLines() {
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36 return (reference[5] & 0xFF) << 8 | (reference[6] & 0xFF);
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37 }
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38
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39 public int getSamplesPerLine() {
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40 return (reference[7] & 0xFF) << 8 | (reference[8] & 0xFF);
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41 }
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42
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43 public int getNumberOfImageComponents() {
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44 return reference[9] & 0xFF;
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45 }
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46
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47 public void setSamplePrecision(int precision) {
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48 reference[4] = (byte)(precision & 0xFF);
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49 }
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50
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51 public void setNumberOfLines(int anInteger) {
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52 reference[5] = (byte)((anInteger & 0xFF00) >> 8);
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53 reference[6] = (byte)(anInteger & 0xFF);
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54 }
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55
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56 public void setSamplesPerLine(int samples) {
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57 reference[7] = (byte)((samples & 0xFF00) >> 8);
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58 reference[8] = (byte)(samples & 0xFF);
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59 }
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60
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61 public void setNumberOfImageComponents(int anInteger) {
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62 reference[9] = (byte)(anInteger & 0xFF);
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63 }
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64
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65 public int getMaxHFactor() {
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66 return maxHFactor;
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67 }
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68
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69 public int getMaxVFactor() {
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70 return maxVFactor;
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71 }
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72
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73 public void setMaxHFactor(int anInteger) {
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74 maxHFactor = anInteger;
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75 }
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76
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77 public void setMaxVFactor(int anInteger) {
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78 maxVFactor = anInteger;
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79 }
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80
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81 /* Used when decoding. */
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82 void initializeComponentParameters() {
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83 int nf = getNumberOfImageComponents();
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84 componentIdentifiers = new int[nf];
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85 int[][] compSpecParams = new int[0][];
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86 int hmax = 1;
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87 int vmax = 1;
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88 for (int i = 0; i < nf; i++) {
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89 int ofs = i * 3 + 10;
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90 int ci = reference[ofs] & 0xFF;
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91 componentIdentifiers[i] = ci;
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92 int hi = (reference[ofs + 1] & 0xFF) >> 4;
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93 int vi = reference[ofs + 1] & 0xF;
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94 int tqi = reference[ofs + 2] & 0xFF;
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95 if (hi > hmax) {
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96 hmax = hi;
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97 }
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98 if (vi > vmax) {
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99 vmax = vi;
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100 }
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101 int[] compParam = new int[5];
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102 compParam[0] = tqi;
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103 compParam[1] = hi;
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104 compParam[2] = vi;
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105 if (compSpecParams.length <= ci) {
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106 int[][] newParams = new int[ci + 1][];
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107 System.arraycopy(compSpecParams, 0, newParams, 0, compSpecParams.length);
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108 compSpecParams = newParams;
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109 }
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110 compSpecParams[ci] = compParam;
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111 }
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112 int x = getSamplesPerLine();
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113 int y = getNumberOfLines();
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114 int[] multiples = new int[] { 8, 16, 24, 32 };
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115 for (int i = 0; i < nf; i++) {
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116 int[] compParam = compSpecParams[componentIdentifiers[i]];
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117 int hi = compParam[1];
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118 int vi = compParam[2];
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119 int compWidth = (x * hi + hmax - 1) / hmax;
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120 int compHeight = (y * vi + vmax - 1) / vmax;
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121 int dsWidth = roundUpToMultiple(compWidth, multiples[hi - 1]);
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122 int dsHeight = roundUpToMultiple(compHeight, multiples[vi - 1]);
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123 compParam[3] = dsWidth;
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124 compParam[4] = dsHeight;
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125 }
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126 setMaxHFactor(hmax);
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127 setMaxVFactor(vmax);
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128 componentParameters = compSpecParams;
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129 }
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130
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131 /* Used when encoding. */
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132 public void initializeContents() {
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133 int nf = getNumberOfImageComponents();
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134 if (nf is 0 || nf !is componentParameters.length) {
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135 DWT.error(DWT.ERROR_INVALID_IMAGE);
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136 }
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137 int hmax = 0;
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138 int vmax = 0;
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139 int[][] compSpecParams = componentParameters;
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140 for (int i = 0; i < nf; i++) {
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141 int ofs = i * 3 + 10;
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142 int[] compParam = compSpecParams[componentIdentifiers[i]];
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143 int hi = compParam[1];
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144 int vi = compParam[2];
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145 if (hi * vi > 4) {
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146 DWT.error(DWT.ERROR_INVALID_IMAGE);
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147 }
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148 reference[ofs] = (byte)(i + 1);
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149 reference[ofs + 1] = (byte)(hi * 16 + vi);
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150 reference[ofs + 2] = (byte)(compParam[0]);
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151 if (hi > hmax) hmax = hi;
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152 if (vi > vmax) vmax = vi;
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153 }
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154 int x = getSamplesPerLine();
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155 int y = getNumberOfLines();
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156 int[] multiples = new int[] {8, 16, 24, 32};
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157 for (int i = 0; i < nf; i++) {
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158 int[] compParam = compSpecParams[componentIdentifiers[i]];
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159 int hi = compParam[1];
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160 int vi = compParam[2];
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161 int compWidth = (x * hi + hmax - 1) / hmax;
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162 int compHeight = (y * vi + vmax - 1) / vmax;
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163 int dsWidth = roundUpToMultiple(compWidth, multiples[hi - 1]);
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164 int dsHeight = roundUpToMultiple(compHeight, multiples[vi - 1]);
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165 compParam[3] = dsWidth;
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166 compParam[4] = dsHeight;
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167 }
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168 setMaxHFactor(hmax);
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169 setMaxVFactor(vmax);
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170 }
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171
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172 int roundUpToMultiple(int anInteger, int mInteger) {
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173 int a = anInteger + mInteger - 1;
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174 return a - (a % mInteger);
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175 }
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176
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177 /*
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178 * Verify the information contained in the receiver is correct.
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179 * Answer true if the header contains a valid marker. Otherwise,
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180 * answer false. Valid Start Of Frame markers are:
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181 * SOF_0 - Baseline DCT, Huffman coding
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182 * SOF_1 - Extended sequential DCT, Huffman coding
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183 * SOF_2 - Progressive DCT, Huffman coding
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184 * SOF_3 - Lossless (sequential), Huffman coding
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185 * SOF_5 - Differential sequential, Huffman coding
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186 * SOF_6 - Differential progressive, Huffman coding
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187 * SOF_7 - Differential lossless, Huffman coding
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188 * SOF_9 - Extended sequential DCT, arithmetic coding
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189 * SOF_10 - Progressive DCT, arithmetic coding
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190 * SOF_11 - Lossless (sequential), arithmetic coding
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191 * SOF_13 - Differential sequential, arithmetic coding
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192 * SOF_14 - Differential progressive, arithmetic coding
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193 * SOF_15 - Differential lossless, arithmetic coding
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194 */
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195 public bool verify() {
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196 int marker = getSegmentMarker();
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197 return (marker >= JPEGFileFormat.SOF0 && marker <= JPEGFileFormat.SOF3) ||
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198 (marker >= JPEGFileFormat.SOF5 && marker <= JPEGFileFormat.SOF7) ||
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199 (marker >= JPEGFileFormat.SOF9 && marker <= JPEGFileFormat.SOF11) ||
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200 (marker >= JPEGFileFormat.SOF13 && marker <= JPEGFileFormat.SOF15);
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201 }
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202
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203 public bool isProgressive() {
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204 int marker = getSegmentMarker();
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205 return marker is JPEGFileFormat.SOF2
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206 || marker is JPEGFileFormat.SOF6
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207 || marker is JPEGFileFormat.SOF10
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208 || marker is JPEGFileFormat.SOF14;
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209 }
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210
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211 public bool isArithmeticCoding() {
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212 return getSegmentMarker() >= JPEGFileFormat.SOF9;
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213 }
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214 }