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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include <QtGui> |
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43 |
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44 #include <math.h> |
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45 |
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46 #include "renderthread.h" |
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47 |
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48 //! [0] |
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49 RenderThread::RenderThread(QObject *parent) |
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50 : QThread(parent) |
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51 { |
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52 restart = false; |
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53 abort = false; |
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54 |
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55 for (int i = 0; i < ColormapSize; ++i) |
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56 colormap[i] = rgbFromWaveLength(380.0 + (i * 400.0 / ColormapSize)); |
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57 } |
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58 //! [0] |
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59 |
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60 //! [1] |
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61 RenderThread::~RenderThread() |
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62 { |
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63 mutex.lock(); |
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64 abort = true; |
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65 condition.wakeOne(); |
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66 mutex.unlock(); |
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67 |
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68 wait(); |
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69 } |
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70 //! [1] |
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71 |
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72 //! [2] |
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73 void RenderThread::render(double centerX, double centerY, double scaleFactor, |
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74 QSize resultSize) |
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75 { |
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76 QMutexLocker locker(&mutex); |
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77 |
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78 this->centerX = centerX; |
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79 this->centerY = centerY; |
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80 this->scaleFactor = scaleFactor; |
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81 this->resultSize = resultSize; |
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82 |
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83 if (!isRunning()) { |
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84 start(LowPriority); |
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85 } else { |
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86 restart = true; |
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87 condition.wakeOne(); |
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88 } |
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89 } |
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90 //! [2] |
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91 |
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92 //! [3] |
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93 void RenderThread::run() |
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94 { |
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95 forever { |
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96 mutex.lock(); |
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97 QSize resultSize = this->resultSize; |
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98 double scaleFactor = this->scaleFactor; |
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99 double centerX = this->centerX; |
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100 double centerY = this->centerY; |
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101 mutex.unlock(); |
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102 //! [3] |
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103 |
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104 //! [4] |
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105 int halfWidth = resultSize.width() / 2; |
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106 //! [4] //! [5] |
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107 int halfHeight = resultSize.height() / 2; |
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108 QImage image(resultSize, QImage::Format_RGB32); |
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109 |
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110 const int NumPasses = 8; |
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111 int pass = 0; |
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112 while (pass < NumPasses) { |
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113 const int MaxIterations = (1 << (2 * pass + 6)) + 32; |
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114 const int Limit = 4; |
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115 bool allBlack = true; |
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116 |
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117 for (int y = -halfHeight; y < halfHeight; ++y) { |
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118 if (restart) |
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119 break; |
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120 if (abort) |
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121 return; |
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122 |
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123 uint *scanLine = |
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124 reinterpret_cast<uint *>(image.scanLine(y + halfHeight)); |
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125 double ay = centerY + (y * scaleFactor); |
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126 |
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127 for (int x = -halfWidth; x < halfWidth; ++x) { |
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128 double ax = centerX + (x * scaleFactor); |
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129 double a1 = ax; |
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130 double b1 = ay; |
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131 int numIterations = 0; |
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132 |
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133 do { |
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134 ++numIterations; |
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135 double a2 = (a1 * a1) - (b1 * b1) + ax; |
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136 double b2 = (2 * a1 * b1) + ay; |
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137 if ((a2 * a2) + (b2 * b2) > Limit) |
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138 break; |
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139 |
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140 ++numIterations; |
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141 a1 = (a2 * a2) - (b2 * b2) + ax; |
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142 b1 = (2 * a2 * b2) + ay; |
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143 if ((a1 * a1) + (b1 * b1) > Limit) |
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144 break; |
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145 } while (numIterations < MaxIterations); |
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146 |
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147 if (numIterations < MaxIterations) { |
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148 *scanLine++ = colormap[numIterations % ColormapSize]; |
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149 allBlack = false; |
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150 } else { |
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151 *scanLine++ = qRgb(0, 0, 0); |
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152 } |
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153 } |
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154 } |
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155 |
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156 if (allBlack && pass == 0) { |
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157 pass = 4; |
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158 } else { |
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159 if (!restart) |
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160 emit renderedImage(image, scaleFactor); |
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161 //! [5] //! [6] |
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162 ++pass; |
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163 } |
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164 //! [6] //! [7] |
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165 } |
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166 //! [7] |
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167 |
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168 //! [8] |
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169 mutex.lock(); |
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170 //! [8] //! [9] |
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171 if (!restart) |
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172 condition.wait(&mutex); |
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173 restart = false; |
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174 mutex.unlock(); |
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175 } |
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176 } |
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177 //! [9] |
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178 |
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179 //! [10] |
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180 uint RenderThread::rgbFromWaveLength(double wave) |
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181 { |
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182 double r = 0.0; |
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183 double g = 0.0; |
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184 double b = 0.0; |
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185 |
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186 if (wave >= 380.0 && wave <= 440.0) { |
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187 r = -1.0 * (wave - 440.0) / (440.0 - 380.0); |
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188 b = 1.0; |
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189 } else if (wave >= 440.0 && wave <= 490.0) { |
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190 g = (wave - 440.0) / (490.0 - 440.0); |
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191 b = 1.0; |
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192 } else if (wave >= 490.0 && wave <= 510.0) { |
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193 g = 1.0; |
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194 b = -1.0 * (wave - 510.0) / (510.0 - 490.0); |
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195 } else if (wave >= 510.0 && wave <= 580.0) { |
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196 r = (wave - 510.0) / (580.0 - 510.0); |
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197 g = 1.0; |
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198 } else if (wave >= 580.0 && wave <= 645.0) { |
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199 r = 1.0; |
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200 g = -1.0 * (wave - 645.0) / (645.0 - 580.0); |
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201 } else if (wave >= 645.0 && wave <= 780.0) { |
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202 r = 1.0; |
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203 } |
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204 |
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205 double s = 1.0; |
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206 if (wave > 700.0) |
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207 s = 0.3 + 0.7 * (780.0 - wave) / (780.0 - 700.0); |
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208 else if (wave < 420.0) |
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209 s = 0.3 + 0.7 * (wave - 380.0) / (420.0 - 380.0); |
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210 |
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211 r = pow(r * s, 0.8); |
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212 g = pow(g * s, 0.8); |
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213 b = pow(b * s, 0.8); |
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214 return qRgb(int(r * 255), int(g * 255), int(b * 255)); |
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215 } |
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216 //! [10] |