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annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/image/JPEGQuantizationTable.d @ 0:6dd524f61e62

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add dwt win and basic java stuff
author Frank Benoit <benoit@tionex.de>
date Mon, 02 Mar 2009 14:44:16 +0100
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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 * 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 org.eclipse.swt.internal.image.JPEGQuantizationTable;
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14
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15 import org.eclipse.swt.internal.image.LEDataInputStream;
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16 import org.eclipse.swt.internal.image.JPEGVariableSizeSegment;
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17 import org.eclipse.swt.internal.image.JPEGFileFormat;
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18
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19 import java.lang.System;
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20
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21 final class JPEGQuantizationTable : JPEGVariableSizeSegment {
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22 public static byte[] DefaultLuminanceQTable = [
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23 cast(byte)255, cast(byte)219, 0, 67, 0,
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24 16, 11, 10, 16, 24, 40, 51, 61,
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25 12, 12, 14, 19, 26, 58, 60, 55,
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26 14, 13, 16, 24, 40, 57, 69, 56,
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27 14, 17, 22, 29, 51, 87, 80, 62,
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28 18, 22, 37, 56, 68, 109, 103, 77,
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29 24, 35, 55, 64, 81, 104, 113, 92,
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30 49, 64, 78, 87, 103, 121, 120, 101,
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31 72, 92, 95, 98, 112, 100, 103, 99
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32 ];
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33 public static byte[] DefaultChrominanceQTable = [
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34 cast(byte)255, cast(byte)219, 0, 67, 1,
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35 17, 18, 24, 47, 99, 99, 99, 99,
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36 18, 21, 26, 66, 99, 99, 99, 99,
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37 24, 26, 56, 99, 99, 99, 99, 99,
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38 47, 66, 99, 99, 99, 99, 99, 99,
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39 99, 99, 99, 99, 99, 99, 99, 99,
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40 99, 99, 99, 99, 99, 99, 99, 99,
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41 99, 99, 99, 99, 99, 99, 99, 99,
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42 99, 99, 99, 99, 99, 99, 99, 99
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43 ];
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44
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45 public this(byte[] reference) {
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46 super(reference);
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47 }
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48
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49 public this(LEDataInputStream byteStream) {
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50 super(byteStream);
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51 }
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52
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53 public static JPEGQuantizationTable defaultChrominanceTable() {
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54 byte[] data = new byte[DefaultChrominanceQTable.length];
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55 System.arraycopy(DefaultChrominanceQTable, 0, data, 0, data.length);
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56 return new JPEGQuantizationTable(data);
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57 }
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58
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59 public static JPEGQuantizationTable defaultLuminanceTable() {
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60 byte[] data = new byte[DefaultLuminanceQTable.length];
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61 System.arraycopy(DefaultLuminanceQTable, 0, data, 0, data.length);
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62 return new JPEGQuantizationTable(data);
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63 }
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64
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65 public int[] getQuantizationTablesKeys() {
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66 int[] keys = new int[4];
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67 int keysIndex = 0;
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68 int totalLength = getSegmentLength() - 2;
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69 int ofs = 4;
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70 while (totalLength > 64) {
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71 int tq = reference[ofs] & 0xF;
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72 int pq = (reference[ofs] & 0xFF) >> 4;
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73 if (pq is 0) {
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74 ofs += 65;
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75 totalLength -= 65;
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76 } else {
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77 ofs += 129;
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78 totalLength -= 129;
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79 }
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80 if (keysIndex >= keys.length) {
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81 int[] newKeys = new int[keys.length + 4];
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82 System.arraycopy(keys, 0, newKeys, 0, keys.length);
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83 keys = newKeys;
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84 }
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85 keys[keysIndex] = tq;
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86 keysIndex++;
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87 }
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88 int[] newKeys = new int[keysIndex];
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89 System.arraycopy(keys, 0, newKeys, 0, keysIndex);
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90 return newKeys;
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91 }
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92
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93 public int[][] getQuantizationTablesValues() {
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94 int[][] values = new int[][](4);
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95 int valuesIndex = 0;
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96 int totalLength = getSegmentLength() - 2;
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97 int ofs = 4;
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98 while (totalLength > 64) {
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99 int[] qk = new int[64];
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100 int pq = (reference[ofs] & 0xFF) >> 4;
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101 if (pq is 0) {
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102 for (int i = 0; i < qk.length; i++) {
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103 qk[i] = reference[ofs + i + 1] & 0xFF;
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104 }
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105 ofs += 65;
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106 totalLength -= 65;
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107 } else {
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108 for (int i = 0; i < qk.length; i++) {
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109 int idx = (i - 1) * 2 ;
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110 qk[i] = (reference[ofs + idx + 1] & 0xFF) * 256 + (reference[ofs + idx + 2] & 0xFF);
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111 }
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112 ofs += 129;
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113 totalLength -= 129;
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114 }
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115 if (valuesIndex >= values.length) {
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116 int[][] newValues = new int[][](values.length + 4);
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117 System.arraycopy(values, 0, newValues, 0, values.length);
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118 values = newValues;
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119 }
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120 values[valuesIndex] = qk;
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121 valuesIndex++;
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122 }
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123 int[][] newValues = new int[][](valuesIndex);
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124 System.arraycopy(values, 0, newValues, 0, valuesIndex);
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125 return newValues;
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126 }
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127
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128 public void scaleBy(int qualityFactor) {
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129 int qFactor = qualityFactor;
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130 if (qFactor <= 0) {
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131 qFactor = 1;
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132 }
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133 if (qFactor > 100) {
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134 qFactor = 100;
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135 }
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136 if (qFactor < 50) {
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137 qFactor = 5000 / qFactor;
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138 } else {
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139 qFactor = 200 - (qFactor * 2);
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140 }
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141 int totalLength = getSegmentLength() - 2;
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142 int ofs = 4;
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143 while (totalLength > 64) {
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144 // int tq = reference[ofs] & 0xFF;
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145 int pq = (reference[ofs] & 0xFF) >> 4;
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146 if (pq is 0) {
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147 for (int i = ofs + 1; i <= ofs + 64; i++) {
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148 int temp = ((reference[i] & 0xFF) * qFactor + 50) / 100;
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149 if (temp <= 0) temp = 1;
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150 if (temp > 255) temp = 255;
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151 reference[i] = cast(byte)temp;
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152 }
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153 ofs += 65;
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154 totalLength -= 65;
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155 } else {
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156 for (int i = ofs + 1; i <= ofs + 128; i += 2) {
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157 int temp = (((reference[i] & 0xFF) * 256 + (reference[i + 1] & 0xFF)) * qFactor + 50) / 100;
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158 if (temp <= 0) temp = 1;
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159 if (temp > 32767) temp = 32767;
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160 reference[i] = cast(byte)(temp >> 8);
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161 reference[i + 1] = cast(byte)(temp & 0xFF);
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162 }
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163 ofs += 129;
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164 totalLength -= 129;
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165 }
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166 }
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167 }
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168
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169 public override int signature() {
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170 return JPEGFileFormat.DQT;
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171 }
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172 }