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annotate dwt/internal/image/JPEGScanHeader.d @ 34:5123b17c98ef

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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sun, 14 Sep 2008 01:45:57 +0200
parents e831403a80a9
children
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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 * 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.JPEGScanHeader;
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15 import dwt.DWT;
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16 import dwt.internal.image.JPEGVariableSizeSegment;
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17 import dwt.internal.image.LEDataInputStream;
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18 import dwt.internal.image.JPEGFileFormat;
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19 import dwt.dwthelper.utils;
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21 final class JPEGScanHeader : JPEGVariableSizeSegment {
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22 public int[][] componentParameters;
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23
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24 public this(byte[] reference) {
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25 super(reference);
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26 }
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28 public this(LEDataInputStream byteStream) {
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29 super(byteStream);
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30 initializeComponentParameters();
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31 }
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33 public int getApproxBitPositionHigh() {
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34 return reference[(2 * getNumberOfImageComponents()) + 7] >> 4;
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35 }
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37 public int getApproxBitPositionLow() {
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38 return reference[(2 * getNumberOfImageComponents()) + 7] & 0xF;
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39 }
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40
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41 public int getEndOfSpectralSelection() {
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42 return reference[(2 * getNumberOfImageComponents()) + 6];
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43 }
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44
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45 public int getNumberOfImageComponents() {
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46 return reference[4];
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47 }
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48
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49 public int getStartOfSpectralSelection() {
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50 return reference[(2 * getNumberOfImageComponents()) + 5];
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51 }
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52
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53 /* Used when decoding. */
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54 void initializeComponentParameters() {
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55 int compCount = getNumberOfImageComponents();
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56 componentParameters = null;
0
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57 for (int i = 0; i < compCount; i++) {
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58 int ofs = 5 + i * 2;
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59 int cid = reference[ofs] & 0xFF;
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60 int dc = (reference[ofs + 1] & 0xFF) >> 4;
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61 int ac = reference[ofs + 1] & 0xF;
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62 if (componentParameters.length <= cid) {
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63 int[][] newParams = new int[][](cid + 1);
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64 System.arraycopy(componentParameters, 0, newParams, 0, componentParameters.length);
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65 componentParameters = newParams;
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66 }
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67 componentParameters[cid] = [ dc, ac ];
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68 }
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69 }
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70
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71 /* Used when encoding. */
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72 public void initializeContents() {
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73 int compCount = getNumberOfImageComponents();
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74 int[][] compSpecParams = componentParameters;
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75 if (compCount is 0 || compCount !is compSpecParams.length) {
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76 DWT.error(DWT.ERROR_INVALID_IMAGE);
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77 }
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78 for (int i = 0; i < compCount; i++) {
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79 int ofs = i * 2 + 5;
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80 int[] compParams = compSpecParams[i];
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81 reference[ofs] = cast(byte)(i + 1);
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82 reference[ofs + 1] = cast(byte)(compParams[0] * 16 + compParams[1]);
0
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83 }
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84 }
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85
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86 public void setEndOfSpectralSelection(int anInteger) {
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87 reference[(2 * getNumberOfImageComponents()) + 6] = cast(byte)anInteger;
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88 }
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89
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90 public void setNumberOfImageComponents(int anInteger) {
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91 reference[4] = cast(byte)(anInteger & 0xFF);
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92 }
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93
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94 public void setStartOfSpectralSelection(int anInteger) {
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95 reference[(2 * getNumberOfImageComponents()) + 5] = cast(byte)anInteger;
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96 }
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97
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98 public override int signature() {
0
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99 return JPEGFileFormat.SOS;
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100 }
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101
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102 public bool verifyProgressiveScan() {
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103 int start = getStartOfSpectralSelection();
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104 int end = getEndOfSpectralSelection();
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105 int low = getApproxBitPositionLow();
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106 int high = getApproxBitPositionHigh();
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107 int count = getNumberOfImageComponents();
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108 if ((start is 0 && end is 00) || (start <= end && end <= 63)) {
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109 if (low <= 13 && high <= 13 && (high is 0 || high is low + 1)) {
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110 return start is 0 || (start > 0 && count is 1);
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111 }
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112 }
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113 return false;
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114 }
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115
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116 public bool isACProgressiveScan() {
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117 return getStartOfSpectralSelection() !is 0 && getEndOfSpectralSelection() !is 0;
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118 }
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119
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120 public bool isDCProgressiveScan() {
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121 return getStartOfSpectralSelection() is 0 && getEndOfSpectralSelection() is 0;
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122 }
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123
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124 public bool isFirstScan() {
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125 return getApproxBitPositionHigh() is 0;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
126 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
127
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
128 }