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annotate dwt/internal/image/JPEGFrameHeader.d @ 213:36f5cb12e1a2

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Update to SWT 3.4M7
author Frank Benoit <benoit@tionex.de>
date Sat, 17 May 2008 17:34:28 +0200
parents 9a64a7781bab
children
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31
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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1 /*******************************************************************************
2
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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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.internal.image.JPEGFrameHeader;
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14
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15
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16 import dwt.DWT;
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17 import dwt.internal.image.JPEGVariableSizeSegment;
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18 import dwt.internal.image.JPEGFileFormat;
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19 import dwt.internal.image.LEDataInputStream;
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20 import dwt.dwthelper.utils;
2
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21
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22 final class JPEGFrameHeader : JPEGVariableSizeSegment {
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23 int maxVFactor;
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24 int maxHFactor;
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25 public int[] componentIdentifiers;
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26 public int[][] componentParameters;
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27
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28 public this(byte[] reference) {
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29 super(reference);
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30 }
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31
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32 public this(LEDataInputStream byteStream) {
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33 super(byteStream);
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34 initializeComponentParameters();
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35 }
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36
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37 public int getSamplePrecision() {
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38 return reference[4] & 0xFF;
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39 }
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40
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41 public int getNumberOfLines() {
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42 return (reference[5] & 0xFF) << 8 | (reference[6] & 0xFF);
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43 }
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44
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45 public int getSamplesPerLine() {
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46 return (reference[7] & 0xFF) << 8 | (reference[8] & 0xFF);
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47 }
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48
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49 public int getNumberOfImageComponents() {
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50 return reference[9] & 0xFF;
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51 }
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52
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53 public void setSamplePrecision(int precision) {
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54 reference[4] = cast(byte)(precision & 0xFF);
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55 }
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56
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57 public void setNumberOfLines(int anInteger) {
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58 reference[5] = cast(byte)((anInteger & 0xFF00) >> 8);
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59 reference[6] = cast(byte)(anInteger & 0xFF);
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60 }
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61
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62 public void setSamplesPerLine(int samples) {
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63 reference[7] = cast(byte)((samples & 0xFF00) >> 8);
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64 reference[8] = cast(byte)(samples & 0xFF);
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65 }
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66
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67 public void setNumberOfImageComponents(int anInteger) {
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68 reference[9] = cast(byte)(anInteger & 0xFF);
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69 }
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70
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71 public int getMaxHFactor() {
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72 return maxHFactor;
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73 }
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74
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75 public int getMaxVFactor() {
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76 return maxVFactor;
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77 }
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78
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79 public void setMaxHFactor(int anInteger) {
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80 maxHFactor = anInteger;
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81 }
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82
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83 public void setMaxVFactor(int anInteger) {
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84 maxVFactor = anInteger;
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85 }
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86
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87 /* Used when decoding. */
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88 void initializeComponentParameters() {
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89 int nf = getNumberOfImageComponents();
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90 componentIdentifiers = new int[nf];
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91 int[][] compSpecParams;
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92 int hmax = 1;
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93 int vmax = 1;
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94 for (int i = 0; i < nf; i++) {
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95 int ofs = i * 3 + 10;
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96 int ci = reference[ofs] & 0xFF;
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97 componentIdentifiers[i] = ci;
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98 int hi = (reference[ofs + 1] & 0xFF) >> 4;
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99 int vi = reference[ofs + 1] & 0xF;
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100 int tqi = reference[ofs + 2] & 0xFF;
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101 if (hi > hmax) {
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102 hmax = hi;
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103 }
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104 if (vi > vmax) {
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105 vmax = vi;
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106 }
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107 int[] compParam = new int[5];
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108 compParam[0] = tqi;
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109 compParam[1] = hi;
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110 compParam[2] = vi;
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111 if (compSpecParams.length <= ci) {
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112 int[][] newParams = new int[][](ci + 1);
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113 System.arraycopy(compSpecParams, 0, newParams, 0, compSpecParams.length);
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114 compSpecParams = newParams;
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115 }
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116 compSpecParams[ci] = compParam;
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117 }
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118 int x = getSamplesPerLine();
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119 int y = getNumberOfLines();
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120 int[] multiples = [ 8, 16, 24, 32 ];
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121 for (int i = 0; i < nf; i++) {
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122 int[] compParam = compSpecParams[componentIdentifiers[i]];
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123 int hi = compParam[1];
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124 int vi = compParam[2];
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125 int compWidth = (x * hi + hmax - 1) / hmax;
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126 int compHeight = (y * vi + vmax - 1) / vmax;
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127 int dsWidth = roundUpToMultiple(compWidth, multiples[hi - 1]);
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128 int dsHeight = roundUpToMultiple(compHeight, multiples[vi - 1]);
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129 compParam[3] = dsWidth;
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130 compParam[4] = dsHeight;
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131 }
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132 setMaxHFactor(hmax);
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133 setMaxVFactor(vmax);
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134 componentParameters = compSpecParams;
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135 }
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136
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137 /* Used when encoding. */
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138 public void initializeContents() {
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139 int nf = getNumberOfImageComponents();
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140 if (nf is 0 || nf !is componentParameters.length) {
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141 DWT.error(DWT.ERROR_INVALID_IMAGE);
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142 }
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143 int hmax = 0;
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144 int vmax = 0;
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145 int[][] compSpecParams = componentParameters;
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146 for (int i = 0; i < nf; i++) {
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147 int ofs = i * 3 + 10;
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148 int[] compParam = compSpecParams[componentIdentifiers[i]];
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149 int hi = compParam[1];
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150 int vi = compParam[2];
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151 if (hi * vi > 4) {
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152 DWT.error(DWT.ERROR_INVALID_IMAGE);
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153 }
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154 reference[ofs] = cast(byte)(i + 1);
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155 reference[ofs + 1] = cast(byte)(hi * 16 + vi);
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156 reference[ofs + 2] = cast(byte)(compParam[0]);
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157 if (hi > hmax) hmax = hi;
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158 if (vi > vmax) vmax = vi;
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159 }
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160 int x = getSamplesPerLine();
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161 int y = getNumberOfLines();
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162 int[] multiples = [8, 16, 24, 32];
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163 for (int i = 0; i < nf; i++) {
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164 int[] compParam = compSpecParams[componentIdentifiers[i]];
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165 int hi = compParam[1];
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166 int vi = compParam[2];
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167 int compWidth = (x * hi + hmax - 1) / hmax;
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168 int compHeight = (y * vi + vmax - 1) / vmax;
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169 int dsWidth = roundUpToMultiple(compWidth, multiples[hi - 1]);
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170 int dsHeight = roundUpToMultiple(compHeight, multiples[vi - 1]);
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171 compParam[3] = dsWidth;
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172 compParam[4] = dsHeight;
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173 }
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174 setMaxHFactor(hmax);
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175 setMaxVFactor(vmax);
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176 }
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177
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178 int roundUpToMultiple(int anInteger, int mInteger) {
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179 int a = anInteger + mInteger - 1;
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180 return a - (a % mInteger);
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181 }
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182
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183 /*
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184 * Verify the information contained in the receiver is correct.
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185 * Answer true if the header contains a valid marker. Otherwise,
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186 * answer false. Valid Start Of Frame markers are:
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187 * SOF_0 - Baseline DCT, Huffman coding
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188 * SOF_1 - Extended sequential DCT, Huffman coding
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189 * SOF_2 - Progressive DCT, Huffman coding
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190 * SOF_3 - Lossless (sequential), Huffman coding
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191 * SOF_5 - Differential sequential, Huffman coding
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192 * SOF_6 - Differential progressive, Huffman coding
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193 * SOF_7 - Differential lossless, Huffman coding
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194 * SOF_9 - Extended sequential DCT, arithmetic coding
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195 * SOF_10 - Progressive DCT, arithmetic coding
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196 * SOF_11 - Lossless (sequential), arithmetic coding
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197 * SOF_13 - Differential sequential, arithmetic coding
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198 * SOF_14 - Differential progressive, arithmetic coding
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199 * SOF_15 - Differential lossless, arithmetic coding
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200 */
213
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201 public override bool verify() {
2
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202 int marker = getSegmentMarker();
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203 return (marker >= JPEGFileFormat.SOF0 && marker <= JPEGFileFormat.SOF3) ||
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204 (marker >= JPEGFileFormat.SOF5 && marker <= JPEGFileFormat.SOF7) ||
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205 (marker >= JPEGFileFormat.SOF9 && marker <= JPEGFileFormat.SOF11) ||
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206 (marker >= JPEGFileFormat.SOF13 && marker <= JPEGFileFormat.SOF15);
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207 }
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208
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209 public bool isProgressive() {
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210 int marker = getSegmentMarker();
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211 return marker is JPEGFileFormat.SOF2
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212 || marker is JPEGFileFormat.SOF6
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213 || marker is JPEGFileFormat.SOF10
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214 || marker is JPEGFileFormat.SOF14;
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215 }
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216
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217 public bool isArithmeticCoding() {
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218 return getSegmentMarker() >= JPEGFileFormat.SOF9;
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219 }
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220 }