Mercurial > projects > dwt-mac

annotate dwt/internal/image/JPEGQuantizationTable.d @ 7:e831403a80a9

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Add 'cast' to casts
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:30:35 +0200
parents 1a8b3cb347e0
children 5123b17c98ef
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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 final class JPEGQuantizationTable : JPEGVariableSizeSegment {
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15 public static byte[] DefaultLuminanceQTable = {
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16 cast(byte)255, cast(byte)219, 0, 67, 0,
0
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17 16, 11, 10, 16, 24, 40, 51, 61,
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18 12, 12, 14, 19, 26, 58, 60, 55,
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19 14, 13, 16, 24, 40, 57, 69, 56,
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20 14, 17, 22, 29, 51, 87, 80, 62,
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21 18, 22, 37, 56, 68, 109, 103, 77,
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22 24, 35, 55, 64, 81, 104, 113, 92,
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23 49, 64, 78, 87, 103, 121, 120, 101,
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24 72, 92, 95, 98, 112, 100, 103, 99
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25 };
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26 public static byte[] DefaultChrominanceQTable = {
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27 cast(byte)255, cast(byte)219, 0, 67, 1,
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28 17, 18, 24, 47, 99, 99, 99, 99,
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29 18, 21, 26, 66, 99, 99, 99, 99,
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30 24, 26, 56, 99, 99, 99, 99, 99,
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31 47, 66, 99, 99, 99, 99, 99, 99,
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32 99, 99, 99, 99, 99, 99, 99, 99,
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33 99, 99, 99, 99, 99, 99, 99, 99,
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34 99, 99, 99, 99, 99, 99, 99, 99,
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35 99, 99, 99, 99, 99, 99, 99, 99
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36 };
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37
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1a8b3cb347e0 Fix Ctors to 'this'
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38 public this(byte[] reference) {
0
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39 super(reference);
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40 }
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41
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42 public this(LEDataInputStream byteStream) {
0
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43 super(byteStream);
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44 }
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45
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46 public static JPEGQuantizationTable defaultChrominanceTable() {
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47 byte[] data = new byte[DefaultChrominanceQTable.length];
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48 System.arraycopy(DefaultChrominanceQTable, 0, data, 0, data.length);
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49 return new JPEGQuantizationTable(data);
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50 }
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51
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52 public static JPEGQuantizationTable defaultLuminanceTable() {
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53 byte[] data = new byte[DefaultLuminanceQTable.length];
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54 System.arraycopy(DefaultLuminanceQTable, 0, data, 0, data.length);
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55 return new JPEGQuantizationTable(data);
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56 }
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57
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58 public int[] getQuantizationTablesKeys() {
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59 int[] keys = new int[4];
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60 int keysIndex = 0;
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61 int totalLength = getSegmentLength() - 2;
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62 int ofs = 4;
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63 while (totalLength > 64) {
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64 int tq = reference[ofs] & 0xF;
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65 int pq = (reference[ofs] & 0xFF) >> 4;
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66 if (pq is 0) {
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67 ofs += 65;
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68 totalLength -= 65;
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69 } else {
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70 ofs += 129;
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71 totalLength -= 129;
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72 }
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73 if (keysIndex >= keys.length) {
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74 int[] newKeys = new int[keys.length + 4];
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75 System.arraycopy(keys, 0, newKeys, 0, keys.length);
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76 keys = newKeys;
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77 }
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78 keys[keysIndex] = tq;
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79 keysIndex++;
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80 }
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81 int[] newKeys = new int[keysIndex];
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82 System.arraycopy(keys, 0, newKeys, 0, keysIndex);
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83 return newKeys;
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84 }
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85
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86 public int[][] getQuantizationTablesValues() {
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87 int[][] values = new int[4][];
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88 int valuesIndex = 0;
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89 int totalLength = getSegmentLength() - 2;
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90 int ofs = 4;
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91 while (totalLength > 64) {
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92 int[] qk = new int[64];
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93 int pq = (reference[ofs] & 0xFF) >> 4;
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94 if (pq is 0) {
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95 for (int i = 0; i < qk.length; i++) {
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96 qk[i] = reference[ofs + i + 1] & 0xFF;
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97 }
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98 ofs += 65;
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99 totalLength -= 65;
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100 } else {
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101 for (int i = 0; i < qk.length; i++) {
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102 int idx = (i - 1) * 2 ;
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103 qk[i] = (reference[ofs + idx + 1] & 0xFF) * 256 + (reference[ofs + idx + 2] & 0xFF);
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104 }
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105 ofs += 129;
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106 totalLength -= 129;
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107 }
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108 if (valuesIndex >= values.length) {
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109 int[][] newValues = new int[values.length + 4][];
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110 System.arraycopy(values, 0, newValues, 0, values.length);
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111 values = newValues;
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112 }
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113 values[valuesIndex] = qk;
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114 valuesIndex++;
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115 }
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116 int[][] newValues = new int[valuesIndex][];
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117 System.arraycopy(values, 0, newValues, 0, valuesIndex);
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118 return newValues;
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119 }
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120
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121 public void scaleBy(int qualityFactor) {
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122 int qFactor = qualityFactor;
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123 if (qFactor <= 0) {
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124 qFactor = 1;
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125 }
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126 if (qFactor > 100) {
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127 qFactor = 100;
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128 }
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129 if (qFactor < 50) {
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130 qFactor = 5000 / qFactor;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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131 } else {
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132 qFactor = 200 - (qFactor * 2);
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133 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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134 int totalLength = getSegmentLength() - 2;
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135 int ofs = 4;
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136 while (totalLength > 64) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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137 // int tq = reference[ofs] & 0xFF;
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138 int pq = (reference[ofs] & 0xFF) >> 4;
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parents:
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139 if (pq is 0) {
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140 for (int i = ofs + 1; i <= ofs + 64; i++) {
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parents:
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141 int temp = ((reference[i] & 0xFF) * qFactor + 50) / 100;
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142 if (temp <= 0) temp = 1;
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parents:
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143 if (temp > 255) temp = 255;
7
e831403a80a9 Add 'cast' to casts
Frank Benoit <benoit@tionex.de>
parents: 5
diff changeset
144 reference[i] = cast(byte)temp;
0
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145 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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146 ofs += 65;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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147 totalLength -= 65;
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parents:
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148 } else {
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149 for (int i = ofs + 1; i <= ofs + 128; i += 2) {
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150 int temp = (((reference[i] & 0xFF) * 256 + (reference[i + 1] & 0xFF)) * qFactor + 50) / 100;
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parents:
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151 if (temp <= 0) temp = 1;
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parents:
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152 if (temp > 32767) temp = 32767;
7
e831403a80a9 Add 'cast' to casts
Frank Benoit <benoit@tionex.de>
parents: 5
diff changeset
153 reference[i] = cast(byte)(temp >> 8);
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Frank Benoit <benoit@tionex.de>
parents: 5
diff changeset
154 reference[i + 1] = cast(byte)(temp & 0xFF);
0
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parents:
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155 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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156 ofs += 129;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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157 totalLength -= 129;
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parents:
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158 }
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parents:
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159 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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160 }
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parents:
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161
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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162 public int signature() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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163 return JPEGFileFormat.DQT;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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164 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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165 }