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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 801 | - | 1 | /* |
| 2 | * |
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| 3 | * This file is part of QMapControl, |
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| 4 | * an open-source cross-platform map widget |
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| 5 | * |
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| 6 | * Copyright (C) 2007 - 2008 Kai Winter |
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| 7 | * |
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| 8 | * This program is free software: you can redistribute it and/or modify |
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| 9 | * it under the terms of the GNU Lesser General Public License as published by |
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| 10 | * the Free Software Foundation, either version 3 of the License, or |
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| 11 | * (at your option) any later version. |
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| 12 | * |
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| 13 | * This program is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | * GNU Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public License |
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| 19 | * along with QMapControl. If not, see <http://www.gnu.org/licenses/>. |
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| 20 | * |
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| 21 | * Contact e-mail: kaiwinter@gmx.de |
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| 22 | * Program URL : http://qmapcontrol.sourceforge.net/ |
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| 23 | * |
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| 24 | */ |
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| 25 | |||
| 26 | #include "imagemanager.h" |
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| 27 | namespace qmapcontrol |
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| 28 | { |
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| 29 | ImageManager* ImageManager::m_Instance = 0; |
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| 30 | ImageManager::ImageManager(QObject* parent) |
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| 31 | :QObject(parent), emptyPixmap(QPixmap(1,1)), net(new MapNetwork(this)), doPersistentCaching(false) |
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| 32 | { |
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| 33 | emptyPixmap.fill(Qt::transparent); |
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| 34 | |||
| 35 | if (QPixmapCache::cacheLimit() <= 20000) |
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| 36 | { |
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| 37 | QPixmapCache::setCacheLimit(20000); // in kb |
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| 38 | } |
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| 39 | } |
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| 40 | |||
| 41 | |||
| 42 | ImageManager::~ImageManager() |
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| 43 | { |
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| 44 | if (ImageManager::m_Instance != 0) |
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| 45 | { |
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| 46 | delete ImageManager::m_Instance; |
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| 47 | } |
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| 48 | delete net; |
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| 49 | } |
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| 50 | |||
| 51 | QPixmap ImageManager::getImage(const QString& host, const QString& url) |
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| 52 | { |
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| 53 | //qDebug() << "ImageManager::getImage"; |
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| 54 | QPixmap pm; |
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| 55 | //pm.fill(Qt::black); |
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| 56 | |||
| 57 | //is image cached (memory) or currently loading? |
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| 58 | if (!QPixmapCache::find(url, pm) && !net->imageIsLoading(url)) |
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| 59 | // if (!images.contains(url) && !net->imageIsLoading(url)) |
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| 60 | { |
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| 61 | //image cached (persistent)? |
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| 62 | if (doPersistentCaching && tileExist(url)) |
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| 63 | { |
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| 64 | loadTile(url,pm); |
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| 65 | QPixmapCache::insert(url.toAscii().toBase64(), pm); |
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| 66 | } |
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| 67 | else |
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| 68 | { |
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| 69 | //load from net, add empty image |
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| 70 | net->loadImage(host, url); |
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| 71 | //QPixmapCache::insert(url, emptyPixmap); |
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| 72 | return emptyPixmap; |
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| 73 | } |
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| 74 | } |
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| 75 | return pm; |
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| 76 | } |
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| 77 | |||
| 78 | QPixmap ImageManager::prefetchImage(const QString& host, const QString& url) |
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| 79 | { |
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| 80 | #ifdef Q_WS_QWS |
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| 81 | // on mobile devices we don´t want the display resfreshing when tiles are received which are |
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| 82 | // prefetched... This is a performance issue, because mobile devices are very slow in |
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| 83 | // repainting the screen |
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| 84 | prefetch.append(url); |
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| 85 | #endif |
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| 86 | return getImage(host, url); |
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| 87 | } |
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| 88 | |||
| 89 | void ImageManager::receivedImage(const QPixmap pixmap, const QString& url) |
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| 90 | { |
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| 91 | //qDebug() << "ImageManager::receivedImage"; |
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| 92 | QPixmapCache::insert(url, pixmap); |
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| 93 | //images[url] = pixmap; |
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| 94 | |||
| 95 | // needed? |
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| 96 | if (doPersistentCaching && !tileExist(url) ) |
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| 97 | saveTile(url,pixmap); |
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| 98 | |||
| 99 | //((Layer*)this->parent())->imageReceived(); |
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| 100 | |||
| 101 | if (!prefetch.contains(url)) |
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| 102 | { |
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| 103 | emit(imageReceived()); |
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| 104 | } |
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| 105 | else |
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| 106 | { |
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| 107 | |||
| 108 | #ifdef Q_WS_QWS |
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| 109 | prefetch.remove(prefetch.indexOf(url)); |
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| 110 | #endif |
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| 111 | } |
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| 112 | } |
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| 113 | |||
| 114 | void ImageManager::loadingQueueEmpty() |
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| 115 | { |
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| 116 | emit(loadingFinished()); |
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| 117 | //((Layer*)this->parent())->removeZoomImage(); |
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| 118 | //qDebug() << "size of image-map: " << images.size(); |
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| 119 | //qDebug() << "size: " << QPixmapCache::cacheLimit(); |
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| 120 | } |
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| 121 | |||
| 122 | void ImageManager::abortLoading() |
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| 123 | { |
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| 124 | net->abortLoading(); |
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| 125 | } |
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| 126 | void ImageManager::setProxy(QString host, int port) |
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| 127 | { |
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| 128 | net->setProxy(host, port); |
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| 129 | } |
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| 130 | |||
| 131 | void ImageManager::setCacheDir(const QDir& path) |
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| 132 | { |
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| 133 | doPersistentCaching = true; |
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| 134 | cacheDir = path; |
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| 135 | if (!cacheDir.exists()) |
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| 136 | { |
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| 137 | cacheDir.mkpath(cacheDir.absolutePath()); |
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| 138 | } |
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| 139 | } |
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| 140 | |||
| 141 | bool ImageManager::saveTile(QString tileName,QPixmap tileData) |
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| 142 | { |
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| 143 | tileName.replace("/","-"); |
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| 144 | |||
| 145 | QFile file(cacheDir.absolutePath() + "/" + tileName.toAscii().toBase64()); |
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| 146 | |||
| 147 | //qDebug() << "writing: " << file.fileName(); |
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| 148 | if (!file.open(QIODevice::ReadWrite )){ |
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| 149 | qDebug()<<"error reading file"; |
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| 150 | return false; |
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| 151 | } |
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| 152 | QByteArray bytes; |
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| 153 | QBuffer buffer(&bytes); |
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| 154 | buffer.open(QIODevice::WriteOnly); |
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| 155 | tileData.save(&buffer, "PNG"); |
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| 156 | |||
| 157 | file.write(bytes); |
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| 158 | file.close(); |
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| 159 | return true; |
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| 160 | } |
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| 161 | bool ImageManager::loadTile(QString tileName,QPixmap &tileData) |
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| 162 | { |
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| 163 | tileName.replace("/","-"); |
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| 164 | QFile file(cacheDir.absolutePath() + "/" + tileName.toAscii().toBase64()); |
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| 165 | if (!file.open(QIODevice::ReadOnly )) { |
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| 166 | return false; |
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| 167 | } |
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| 168 | tileData.loadFromData( file.readAll() ); |
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| 169 | |||
| 170 | file.close(); |
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| 171 | return true; |
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| 172 | } |
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| 173 | bool ImageManager::tileExist(QString tileName) |
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| 174 | { |
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| 175 | tileName.replace("/","-"); |
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| 176 | QFile file(cacheDir.absolutePath() + "/" + tileName.toAscii().toBase64()); |
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| 177 | if (file.exists()) |
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| 178 | return true; |
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| 179 | else |
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| 180 | return false; |
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| 181 | } |
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| 182 | } |