1 | /* |
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2 | |
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3 | Copyright 2012-2014 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 "tileitem.h" |
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23 | |
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24 | #include <QPainter> |
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25 | |
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26 | #include "settings.h" |
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27 | #include "rendertask.h" |
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28 | #include "pageitem.h" |
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29 | |
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30 | namespace qpdfview |
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31 | { |
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32 | |
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33 | Settings* TileItem::s_settings = 0; |
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34 | |
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35 | QCache< TileItem::CacheKey, TileItem::CacheObject > TileItem::s_cache; |
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36 | |
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37 | TileItem::TileItem(PageItem* page) : QObject(page), |
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38 | m_page(page), |
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39 | m_rect(), |
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40 | m_cropRect(), |
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41 | m_pixmapError(false), |
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42 | m_pixmap(), |
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43 | m_obsoletePixmap(), |
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44 | m_deleteAfterRender(false), |
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45 | m_renderTask(0) |
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46 | { |
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47 | if(s_settings == 0) |
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48 | { |
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49 | s_settings = Settings::instance(); |
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50 | } |
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51 | |
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52 | s_cache.setMaxCost(s_settings->pageItem().cacheSize()); |
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53 | |
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54 | m_renderTask = new RenderTask(m_page->m_page, this); |
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55 | |
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56 | connect(m_renderTask, SIGNAL(finished()), SLOT(on_renderTask_finished())); |
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57 | connect(m_renderTask, SIGNAL(imageReady(RenderParam,QRect,bool,QImage,QRectF)), SLOT(on_renderTask_imageReady(RenderParam,QRect,bool,QImage,QRectF))); |
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58 | } |
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59 | |
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60 | TileItem::~TileItem() |
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61 | { |
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62 | m_renderTask->cancel(true); |
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63 | m_renderTask->wait(); |
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64 | } |
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65 | |
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66 | void TileItem::setCropRect(const QRectF& cropRect) |
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67 | { |
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68 | if(!m_page->m_renderParam.trimMargins()) |
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69 | { |
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70 | return; |
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71 | } |
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72 | |
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73 | if(m_cropRect.isNull() && !cropRect.isNull()) |
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74 | { |
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75 | m_cropRect = cropRect; |
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76 | |
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77 | m_page->updateCropRect(); |
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78 | } |
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79 | } |
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80 | |
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81 | void TileItem::dropCachedPixmaps(PageItem* page) |
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82 | { |
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83 | foreach(CacheKey key, s_cache.keys()) |
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84 | { |
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85 | if(key.first == page) |
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86 | { |
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87 | s_cache.remove(key); |
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88 | } |
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89 | } |
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90 | } |
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91 | |
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92 | bool TileItem::paint(QPainter* painter, const QPointF& topLeft) |
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93 | { |
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94 | const QPixmap& pixmap = takePixmap(); |
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95 | |
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96 | if(!pixmap.isNull()) |
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97 | { |
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98 | // pixmap |
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99 | |
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100 | painter->drawPixmap(m_rect.topLeft() + topLeft, pixmap); |
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101 | |
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102 | return true; |
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103 | } |
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104 | else if(!m_obsoletePixmap.isNull()) |
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105 | { |
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106 | // obsolete pixmap |
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107 | |
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108 | painter->drawPixmap(QRectF(m_rect).translated(topLeft), m_obsoletePixmap, QRectF()); |
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109 | |
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110 | return false; |
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111 | } |
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112 | else |
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113 | { |
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114 | const qreal iconExtent = qMin(0.1 * m_rect.width(), 0.1 * m_rect.height()); |
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115 | const QRect iconRect(topLeft.x() + m_rect.left() + 0.01 * m_rect.width(), |
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116 | topLeft.y() + m_rect.top() + 0.01 * m_rect.height(), |
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117 | iconExtent, iconExtent); |
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118 | |
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119 | if(!m_pixmapError) |
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120 | { |
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121 | // progress icon |
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122 | |
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123 | s_settings->pageItem().progressIcon().paint(painter, iconRect); |
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124 | |
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125 | return false; |
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126 | } |
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127 | else |
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128 | { |
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129 | // error icon |
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130 | |
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131 | s_settings->pageItem().errorIcon().paint(painter, iconRect); |
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132 | |
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133 | return true; |
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134 | } |
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135 | } |
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136 | } |
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137 | |
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138 | void TileItem::refresh(bool keepObsoletePixmaps) |
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139 | { |
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140 | if(keepObsoletePixmaps && s_settings->pageItem().keepObsoletePixmaps()) |
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141 | { |
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142 | if(const CacheObject* object = s_cache.object(cacheKey())) |
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143 | { |
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144 | m_obsoletePixmap = object->first; |
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145 | } |
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146 | } |
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147 | else |
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148 | { |
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149 | m_obsoletePixmap = QPixmap(); |
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150 | } |
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151 | |
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152 | if(!keepObsoletePixmaps) |
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153 | { |
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154 | m_cropRect = QRectF(); |
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155 | } |
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156 | |
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157 | m_renderTask->cancel(true); |
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158 | |
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159 | m_pixmapError = false; |
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160 | m_pixmap = QPixmap(); |
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161 | } |
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162 | |
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163 | int TileItem::startRender(bool prefetch) |
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164 | { |
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165 | if(m_pixmapError || m_renderTask->isRunning() || (prefetch && s_cache.contains(cacheKey()))) |
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166 | { |
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167 | return 0; |
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168 | } |
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169 | |
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170 | m_renderTask->start(m_page->m_renderParam, m_rect, prefetch); |
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171 | |
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172 | return 1; |
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173 | } |
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174 | |
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175 | void TileItem::cancelRender() |
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176 | { |
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177 | m_renderTask->cancel(); |
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178 | |
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179 | m_pixmap = QPixmap(); |
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180 | m_obsoletePixmap = QPixmap(); |
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181 | } |
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182 | |
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183 | void TileItem::deleteAfterRender() |
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184 | { |
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185 | if(!m_renderTask->isRunning()) |
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186 | { |
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187 | deleteLater(); |
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188 | } |
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189 | else |
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190 | { |
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191 | m_renderTask->cancel(true); |
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192 | |
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193 | m_deleteAfterRender = true; |
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194 | } |
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195 | } |
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196 | |
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197 | void TileItem::on_renderTask_finished() |
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198 | { |
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199 | if(m_deleteAfterRender) |
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200 | { |
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201 | deleteLater(); |
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202 | } |
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203 | else if(!m_page->useTiling() || m_page->m_exposedTileItems.contains(this)) |
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204 | { |
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205 | m_page->update(); |
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206 | } |
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207 | } |
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208 | |
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209 | void TileItem::on_renderTask_imageReady(const RenderParam& renderParam, |
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210 | const QRect& rect, bool prefetch, |
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211 | const QImage& image, const QRectF& cropRect) |
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212 | { |
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213 | if(m_page->m_renderParam != renderParam || m_rect != rect) |
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214 | { |
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215 | return; |
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216 | } |
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217 | |
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218 | m_obsoletePixmap = QPixmap(); |
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219 | |
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220 | if(image.isNull()) |
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221 | { |
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222 | m_pixmapError = true; |
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223 | |
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224 | return; |
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225 | } |
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226 | |
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227 | if(prefetch && !m_renderTask->wasCanceledForcibly()) |
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228 | { |
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229 | const int cost = qMax(1, image.width() * image.height() * image.depth() / 8); |
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230 | s_cache.insert(cacheKey(), new CacheObject(QPixmap::fromImage(image), cropRect), cost); |
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231 | |
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232 | setCropRect(cropRect); |
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233 | } |
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234 | else if(!m_renderTask->wasCanceled()) |
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235 | { |
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236 | m_pixmap = QPixmap::fromImage(image); |
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237 | |
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238 | setCropRect(cropRect); |
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239 | } |
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240 | } |
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241 | |
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242 | inline TileItem::CacheKey TileItem::cacheKey() const |
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243 | { |
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244 | QByteArray key; |
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245 | QDataStream stream(&key, QIODevice::WriteOnly); |
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246 | |
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247 | stream << m_page->m_renderParam << m_rect; |
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248 | |
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249 | return qMakePair(m_page, key); |
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250 | } |
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251 | |
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252 | QPixmap TileItem::takePixmap() |
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253 | { |
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254 | const CacheKey key = cacheKey(); |
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255 | |
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256 | if(const CacheObject* object = s_cache.object(key)) |
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257 | { |
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258 | m_obsoletePixmap = QPixmap(); |
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259 | |
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260 | setCropRect(object->second); |
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261 | return object->first; |
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262 | } |
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263 | |
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264 | QPixmap pixmap; |
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265 | |
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266 | if(!m_pixmap.isNull()) |
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267 | { |
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268 | const int cost = qMax(1, m_pixmap.width() * m_pixmap.height() * m_pixmap.depth() / 8); |
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269 | s_cache.insert(key, new CacheObject(m_pixmap, m_cropRect), cost); |
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270 | |
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271 | pixmap = m_pixmap; |
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272 | } |
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273 | else |
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274 | { |
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275 | startRender(); |
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276 | } |
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277 | |
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278 | return pixmap; |
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279 | } |
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280 | |
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281 | } // qpdfview |
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