Mercurial > projects > dwt-mac
annotate dwt/internal/image/PngHuffmanTable.d @ 34:5123b17c98ef
Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sun, 14 Sep 2008 01:45:57 +0200 |
parents | b903c16b6f48 |
children |
rev | line source |
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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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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 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.PngHuffmanTable; |
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14 |
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5123b17c98ef
Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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15 import dwt.internal.image.PngDecodingDataStream; |
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16 |
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17 public class PngHuffmanTable { |
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18 CodeLengthInfo[] codeLengthInfo; |
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19 int[] codeValues; |
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20 |
5123b17c98ef
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21 static const int MAX_CODE_LENGTH = 15; |
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22 static const int BAD_CODE = 0xFFFFFFF; |
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23 static const int incs[] = [1391376, 463792, 198768, 86961, 33936, 13776, 4592, 1968, 861, 336, 112, 48, 21, 7, 3, 1]; |
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24 |
5 | 25 this (int[] lengths) { |
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26 initialize(lengths); |
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27 generateTable(lengths); |
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28 } |
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29 |
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30 private void initialize(int[] lengths) { |
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31 codeValues = new int[lengths.length]; |
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32 for (int i = 0; i < codeValues.length; i++) { |
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33 codeValues[i] = i; |
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34 } |
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5123b17c98ef
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35 |
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36 // minCodesByLength[n] : The smallest Huffman code of length n + 1. |
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37 // maxCodesByLength[n] : The largest Huffman code of length n + 1. |
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38 // indexesByLength[n] : Index into the values array. First value with a code of length n + 1. |
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39 codeLengthInfo = new CodeLengthInfo[MAX_CODE_LENGTH]; |
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40 for (int i = 0; i < MAX_CODE_LENGTH; i++) { |
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41 codeLengthInfo[i] = new CodeLengthInfo(); |
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42 codeLengthInfo[i].length = i; |
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43 codeLengthInfo[i].baseIndex = 0; |
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44 codeLengthInfo[i].min = BAD_CODE; |
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45 codeLengthInfo[i].max = -1; |
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46 } |
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47 } |
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5123b17c98ef
Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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48 |
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49 private void generateTable(int[] lengths) { |
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50 // Sort the values using shellsort. Primary key is code size. Secondary key is value. |
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51 int codeValuesTemp; |
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52 for (int k = 0; k < 16; k++) { |
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53 for (int h = incs[k], i = h; i < lengths.length; i++) { |
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54 int v = lengths[i]; |
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55 codeValuesTemp = codeValues[i]; |
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56 int j = i; |
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57 while (j >= h && (lengths[j - h] > v || (lengths[j - h] is v && codeValues[j - h] > codeValuesTemp))) { |
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58 lengths[j] = lengths[j - h]; |
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59 codeValues[j] = codeValues[j - h]; |
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60 j -= h; |
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61 } |
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62 lengths[j] = v; |
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63 codeValues[j] = codeValuesTemp; |
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64 } |
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65 } |
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66 |
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67 // These values in these arrays correspond to the elements of the |
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68 // "values" array. The Huffman code for codeValues[N] is codes[N] |
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69 // and the length of the code is lengths[N]. |
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70 int[] codes = new int[lengths.length]; |
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71 int lastLength = 0; |
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72 int code = 0; |
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73 for (int i = 0; i < lengths.length; i++) { |
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74 while (lastLength !is lengths[i]) { |
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75 lastLength++; |
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76 code <<= 1; |
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77 } |
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78 if (lastLength !is 0) { |
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79 codes[i] = code; |
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80 code++; |
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81 } |
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82 } |
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5123b17c98ef
Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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83 |
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84 int last = 0; |
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85 for (int i = 0; i < lengths.length; i++) { |
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86 if (last !is lengths[i]) { |
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87 last = lengths[i]; |
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88 codeLengthInfo[last - 1].baseIndex = i; |
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89 codeLengthInfo[last - 1].min = codes[i]; |
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90 } |
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91 if (last !is 0) codeLengthInfo[last - 1].max = codes[i]; |
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92 } |
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93 } |
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94 |
6 | 95 int getNextValue(PngDecodingDataStream stream) { |
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96 int code = stream.getNextIdatBit(); |
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97 int codelength = 0; |
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98 |
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99 // Here we are taking advantage of the fact that 1 bits are used as |
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100 // a prefix to the longer codeValues. |
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101 while (codelength < MAX_CODE_LENGTH && code > codeLengthInfo[codelength].max) { |
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102 code = ((code << 1) | stream.getNextIdatBit()); |
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103 codelength++; |
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104 } |
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105 if (codelength >= MAX_CODE_LENGTH) stream.error(); |
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106 |
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107 // Now we have a Huffman code of length (codelength + 1) that |
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108 // is somewhere in the range |
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109 // minCodesByLength[codelength]..maxCodesByLength[codelength]. |
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110 // This code is the (offset + 1)'th code of (codelength + 1); |
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111 int offset = code - codeLengthInfo[codelength].min; |
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112 |
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113 // indexesByLength[codelength] is the first code of length (codelength + 1) |
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114 // so now we can look up the value for the Huffman code in the table. |
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115 int index = codeLengthInfo[codelength].baseIndex + offset; |
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116 return codeValues[index]; |
34
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117 } |
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118 |
0
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119 static class CodeLengthInfo { |
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120 int length; |
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121 int max; |
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122 int min; |
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123 int baseIndex; |
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124 } |
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125 |
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126 } |