1 | /* |
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2 | |
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3 | Copyright 2013-2015 Adam Reichold |
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4 | |
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5 | This file is part of qpdfview. |
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6 | |
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7 | qpdfview is free software: you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation, either version 2 of the License, or |
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10 | (at your option) any later version. |
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11 | |
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12 | qpdfview is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with qpdfview. If not, see <http://www.gnu.org/licenses/>. |
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19 | |
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20 | */ |
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21 | |
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22 | #include "rendertask.h" |
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23 | |
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24 | #include <qmath.h> |
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25 | #include <QPainter> |
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26 | #include <QThreadPool> |
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27 | |
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28 | #include "model.h" |
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29 | #include "settings.h" |
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30 | |
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31 | namespace |
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32 | { |
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33 | |
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34 | using namespace qpdfview; |
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35 | |
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36 | qreal scaledResolutionX(const RenderParam& renderParam) |
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37 | { |
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38 | return renderParam.devicePixelRatio() |
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39 | * renderParam.resolutionX() |
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40 | * renderParam.scaleFactor(); |
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41 | } |
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42 | |
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43 | qreal scaledResolutionY(const RenderParam& renderParam) |
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44 | { |
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45 | return renderParam.devicePixelRatio() |
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46 | * renderParam.resolutionY() |
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47 | * renderParam.scaleFactor(); |
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48 | } |
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49 | |
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50 | const QRgb alphaMask = 0xff << 24; |
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51 | |
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52 | bool columnHasPaperColor(int x, QRgb paperColor, const QImage& image) |
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53 | { |
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54 | const int height = image.height(); |
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55 | |
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56 | for(int y = 0; y < height; ++y) |
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57 | { |
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58 | const QRgb color = image.pixel(x, y); |
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59 | |
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60 | if(qAlpha(color) != 0 && paperColor != (color | alphaMask)) |
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61 | { |
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62 | return false; |
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63 | } |
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64 | } |
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65 | |
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66 | return true; |
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67 | } |
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68 | |
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69 | bool rowHasPaperColor(int y, QRgb paperColor, const QImage& image) |
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70 | { |
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71 | const int width = image.width(); |
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72 | |
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73 | for(int x = 0; x < width; ++x) |
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74 | { |
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75 | const QRgb color = image.pixel(x, y); |
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76 | |
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77 | if(qAlpha(color) != 0 && paperColor != (color | alphaMask)) |
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78 | { |
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79 | return false; |
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80 | } |
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81 | } |
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82 | |
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83 | return true; |
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84 | } |
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85 | |
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86 | QRectF trimMargins(QRgb paperColor, const QImage& image) |
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87 | { |
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88 | if(image.isNull()) |
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89 | { |
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90 | return QRectF(0.0, 0.0, 1.0, 1.0); |
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91 | } |
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92 | |
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93 | const int width = image.width(); |
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94 | const int height = image.height(); |
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95 | |
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96 | int left; |
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97 | for(left = 0; left < width; ++left) |
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98 | { |
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99 | if(!columnHasPaperColor(left, paperColor, image)) |
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100 | { |
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101 | break; |
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102 | } |
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103 | } |
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104 | left = qMin(left, width / 3); |
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105 | |
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106 | int right; |
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107 | for(right = width - 1; right >= left; --right) |
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108 | { |
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109 | if(!columnHasPaperColor(right, paperColor, image)) |
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110 | { |
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111 | break; |
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112 | } |
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113 | } |
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114 | right = qMax(right, 2 * width / 3); |
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115 | |
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116 | int top; |
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117 | for(top = 0; top < height; ++top) |
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118 | { |
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119 | if(!rowHasPaperColor(top, paperColor, image)) |
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120 | { |
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121 | break; |
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122 | } |
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123 | } |
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124 | top = qMin(top, height / 3); |
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125 | |
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126 | int bottom; |
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127 | for(bottom = height - 1; bottom >= top; --bottom) |
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128 | { |
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129 | if(!rowHasPaperColor(bottom, paperColor, image)) |
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130 | { |
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131 | break; |
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132 | } |
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133 | } |
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134 | bottom = qMax(bottom, 2 * height / 3); |
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135 | |
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136 | left = qMax(left - width / 100, 0); |
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137 | top = qMax(top - height / 100, 0); |
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138 | |
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139 | right = qMin(right + width / 100, width); |
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140 | bottom = qMin(bottom + height / 100, height); |
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141 | |
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142 | return QRectF(static_cast< qreal >(left) / width, |
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143 | static_cast< qreal >(top) / height, |
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144 | static_cast< qreal >(right - left) / width, |
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145 | static_cast< qreal >(bottom - top) / height); |
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146 | } |
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147 | |
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148 | void convertToGrayscale(QImage& image) |
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149 | { |
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150 | QRgb* const begin = reinterpret_cast< QRgb* >(image.bits()); |
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151 | QRgb* const end = reinterpret_cast< QRgb* >(image.bits() + image.byteCount()); |
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152 | |
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153 | for(QRgb* pointer = begin; pointer != end; ++pointer) |
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154 | { |
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155 | const int gray = qGray(*pointer); |
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156 | const int alpha = qAlpha(*pointer); |
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157 | |
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158 | *pointer = qRgba(gray, gray, gray, alpha); |
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159 | } |
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160 | } |
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161 | |
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162 | void composeWithColor(QPainter::CompositionMode mode, const QColor& color, QImage& image) |
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163 | { |
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164 | QPainter painter(&image); |
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165 | |
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166 | painter.setCompositionMode(mode); |
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167 | painter.fillRect(image.rect(), color); |
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168 | } |
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169 | |
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170 | } // anonymous |
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171 | |
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172 | namespace qpdfview |
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173 | { |
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174 | |
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175 | Settings* RenderTask::s_settings = 0; |
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176 | |
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177 | RenderParam RenderTask::s_defaultRenderParam; |
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178 | |
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179 | RenderTask::RenderTask(Model::Page* page, QObject* parent) : QObject(parent), QRunnable(), |
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180 | m_isRunning(false), |
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181 | m_wasCanceled(NotCanceled), |
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182 | m_page(page), |
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183 | m_renderParam(s_defaultRenderParam), |
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184 | m_rect(), |
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185 | m_prefetch(false) |
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186 | { |
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187 | if(s_settings == 0) |
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188 | { |
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189 | s_settings = Settings::instance(); |
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190 | } |
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191 | |
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192 | setAutoDelete(false); |
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193 | } |
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194 | |
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195 | void RenderTask::wait() |
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196 | { |
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197 | QMutexLocker mutexLocker(&m_mutex); |
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198 | |
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199 | while(m_isRunning) |
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200 | { |
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201 | m_waitCondition.wait(&m_mutex); |
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202 | } |
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203 | } |
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204 | |
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205 | bool RenderTask::isRunning() const |
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206 | { |
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207 | QMutexLocker mutexLocker(&m_mutex); |
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208 | |
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209 | return m_isRunning; |
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210 | } |
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211 | |
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212 | void RenderTask::run() |
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213 | { |
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214 | #define CANCELLATION_POINT if(testCancellation()) { finish(); return; } |
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215 | |
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216 | CANCELLATION_POINT |
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217 | |
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218 | QImage image; |
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219 | QRectF cropRect; |
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220 | |
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221 | image = m_page->render(scaledResolutionX(m_renderParam), scaledResolutionY(m_renderParam), |
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222 | m_renderParam.rotation(), m_rect); |
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223 | |
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224 | #if QT_VERSION >= QT_VERSION_CHECK(5,1,0) |
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225 | |
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226 | image.setDevicePixelRatio(m_renderParam.devicePixelRatio()); |
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227 | |
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228 | #endif // QT_VERSION |
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229 | |
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230 | if(m_renderParam.darkenWithPaperColor()) |
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231 | { |
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232 | CANCELLATION_POINT |
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233 | |
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234 | composeWithColor(QPainter::CompositionMode_Darken, s_settings->pageItem().paperColor(), image); |
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235 | } |
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236 | else if(m_renderParam.lightenWithPaperColor()) |
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237 | { |
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238 | CANCELLATION_POINT |
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239 | |
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240 | composeWithColor(QPainter::CompositionMode_Lighten, s_settings->pageItem().paperColor(), image); |
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241 | } |
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242 | |
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243 | if(m_renderParam.trimMargins()) |
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244 | { |
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245 | CANCELLATION_POINT |
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246 | |
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247 | cropRect = trimMargins(s_settings->pageItem().paperColor().rgb() | alphaMask, image); |
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248 | } |
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249 | |
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250 | if(m_renderParam.convertToGrayscale()) |
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251 | { |
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252 | CANCELLATION_POINT |
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253 | |
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254 | convertToGrayscale(image); |
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255 | } |
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256 | |
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257 | if(m_renderParam.invertColors()) |
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258 | { |
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259 | CANCELLATION_POINT |
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260 | |
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261 | image.invertPixels(); |
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262 | } |
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263 | |
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264 | CANCELLATION_POINT |
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265 | |
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266 | emit imageReady(m_renderParam, |
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267 | m_rect, m_prefetch, |
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268 | image, cropRect); |
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269 | |
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270 | finish(); |
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271 | |
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272 | #undef CANCELLATION_POINT |
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273 | } |
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274 | |
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275 | void RenderTask::start(const RenderParam& renderParam, |
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276 | const QRect& rect, bool prefetch) |
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277 | { |
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278 | m_renderParam = renderParam; |
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279 | |
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280 | m_rect = rect; |
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281 | m_prefetch = prefetch; |
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282 | |
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283 | m_mutex.lock(); |
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284 | m_isRunning = true; |
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285 | m_mutex.unlock(); |
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286 | |
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287 | resetCancellation(); |
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288 | |
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289 | QThreadPool::globalInstance()->start(this, prefetch ? 0 : 1); |
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290 | } |
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291 | |
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292 | void RenderTask::finish() |
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293 | { |
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294 | m_renderParam = s_defaultRenderParam; |
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295 | |
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296 | emit finished(); |
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297 | |
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298 | m_mutex.lock(); |
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299 | m_isRunning = false; |
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300 | m_mutex.unlock(); |
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301 | |
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302 | m_waitCondition.wakeAll(); |
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303 | } |
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304 | |
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305 | } // qpdfview |
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