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annotate dwt/internal/image/JPEGScanHeader.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 JPEGScanHeader : JPEGVariableSizeSegment {
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17 public int[][] componentParameters;
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18
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19 public JPEGScanHeader(byte[] reference) {
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20 super(reference);
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21 }
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22
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23 public JPEGScanHeader(LEDataInputStream byteStream) {
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24 super(byteStream);
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25 initializeComponentParameters();
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26 }
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27
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28 public int getApproxBitPositionHigh() {
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29 return reference[(2 * getNumberOfImageComponents()) + 7] >> 4;
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30 }
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31
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32 public int getApproxBitPositionLow() {
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33 return reference[(2 * getNumberOfImageComponents()) + 7] & 0xF;
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34 }
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35
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36 public int getEndOfSpectralSelection() {
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37 return reference[(2 * getNumberOfImageComponents()) + 6];
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38 }
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39
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40 public int getNumberOfImageComponents() {
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41 return reference[4];
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42 }
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43
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44 public int getStartOfSpectralSelection() {
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45 return reference[(2 * getNumberOfImageComponents()) + 5];
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46 }
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47
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48 /* Used when decoding. */
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49 void initializeComponentParameters() {
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50 int compCount = getNumberOfImageComponents();
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51 componentParameters = new int[0][];
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52 for (int i = 0; i < compCount; i++) {
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53 int ofs = 5 + i * 2;
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54 int cid = reference[ofs] & 0xFF;
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55 int dc = (reference[ofs + 1] & 0xFF) >> 4;
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56 int ac = reference[ofs + 1] & 0xF;
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57 if (componentParameters.length <= cid) {
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58 int[][] newParams = new int[cid + 1][];
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59 System.arraycopy(componentParameters, 0, newParams, 0, componentParameters.length);
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60 componentParameters = newParams;
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61 }
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62 componentParameters[cid] = new int[] { dc, ac };
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63 }
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64 }
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65
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66 /* Used when encoding. */
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67 public void initializeContents() {
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68 int compCount = getNumberOfImageComponents();
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69 int[][] compSpecParams = componentParameters;
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70 if (compCount is 0 || compCount !is compSpecParams.length) {
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71 DWT.error(DWT.ERROR_INVALID_IMAGE);
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72 }
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73 for (int i = 0; i < compCount; i++) {
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74 int ofs = i * 2 + 5;
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75 int[] compParams = compSpecParams[i];
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76 reference[ofs] = (byte)(i + 1);
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77 reference[ofs + 1] = (byte)(compParams[0] * 16 + compParams[1]);
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78 }
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79 }
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80
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81 public void setEndOfSpectralSelection(int anInteger) {
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82 reference[(2 * getNumberOfImageComponents()) + 6] = (byte)anInteger;
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83 }
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84
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85 public void setNumberOfImageComponents(int anInteger) {
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86 reference[4] = (byte)(anInteger & 0xFF);
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87 }
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88
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89 public void setStartOfSpectralSelection(int anInteger) {
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90 reference[(2 * getNumberOfImageComponents()) + 5] = (byte)anInteger;
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91 }
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92
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93 public int signature() {
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94 return JPEGFileFormat.SOS;
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95 }
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96
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97 public bool verifyProgressiveScan() {
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98 int start = getStartOfSpectralSelection();
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99 int end = getEndOfSpectralSelection();
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100 int low = getApproxBitPositionLow();
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101 int high = getApproxBitPositionHigh();
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102 int count = getNumberOfImageComponents();
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103 if ((start is 0 && end is 00) || (start <= end && end <= 63)) {
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104 if (low <= 13 && high <= 13 && (high is 0 || high is low + 1)) {
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105 return start is 0 || (start > 0 && count is 1);
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106 }
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107 }
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108 return false;
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109 }
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110
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111 public bool isACProgressiveScan() {
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112 return getStartOfSpectralSelection() !is 0 && getEndOfSpectralSelection() !is 0;
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113 }
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114
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115 public bool isDCProgressiveScan() {
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116 return getStartOfSpectralSelection() is 0 && getEndOfSpectralSelection() is 0;
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117 }
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118
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119 public bool isFirstScan() {
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120 return getApproxBitPositionHigh() is 0;
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121 }
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122
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123 }