/* * * This file is part of QMapControl, * an open-source cross-platform map widget * * Copyright (C) 2007 - 2008 Kai Winter * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with QMapControl. If not, see . * * Contact e-mail: kaiwinter@gmx.de * Program URL : http://qmapcontrol.sourceforge.net/ * */ #include "imagemanager.h" namespace qmapcontrol { ImageManager* ImageManager::m_Instance = 0; ImageManager::ImageManager(QObject* parent) :QObject(parent), emptyPixmap(QPixmap(1,1)), net(new MapNetwork(this)), doPersistentCaching(false) { emptyPixmap.fill(Qt::transparent); if (QPixmapCache::cacheLimit() <= 20000) { QPixmapCache::setCacheLimit(20000); // in kb } } ImageManager::~ImageManager() { delete net; } QPixmap ImageManager::getImage(const QString& host, const QString& url) { // qDebug() << "ImageManager::getImage"; QPixmap pm; // pm.fill(Qt::black); // is image cached (memory) or currently loading? if (!QPixmapCache::find(url, pm) && !net->imageIsLoading(url)) // if (!images.contains(url) && !net->imageIsLoading(url)) { // image cached (persistent)? if (doPersistentCaching && tileExist(url)) { loadTile(url,pm); QPixmapCache::insert(url.toAscii().toBase64(), pm); } else { // load from net, add empty image net->loadImage(host, url); //QPixmapCache::insert(url, emptyPixmap); return emptyPixmap; } } return pm; } QPixmap ImageManager::prefetchImage(const QString& host, const QString& url) { #ifdef Q_WS_QWS // on mobile devices we donĀ“t want the display resfreshing when tiles are received which are // prefetched... This is a performance issue, because mobile devices are very slow in // repainting the screen prefetch.append(url); #endif return getImage(host, url); } void ImageManager::receivedImage(const QPixmap pixmap, const QString& url) { // qDebug() << "ImageManager::receivedImage"; QPixmapCache::insert(url, pixmap); // images[url] = pixmap; // needed? if (doPersistentCaching && !tileExist(url) ) saveTile(url,pixmap); // ((Layer*)this->parent())->imageReceived(); if (!prefetch.contains(url)) { emit(imageReceived()); } else { #ifdef Q_WS_QWS prefetch.remove(prefetch.indexOf(url)); #endif } } void ImageManager::loadingQueueEmpty() { emit(loadingFinished()); // ((Layer*)this->parent())->removeZoomImage(); // qDebug() << "size of image-map: " << images.size(); // qDebug() << "size: " << QPixmapCache::cacheLimit(); } void ImageManager::abortLoading() { net->abortLoading(); } void ImageManager::setProxy(QString host, int port) { net->setProxy(host, port); } void ImageManager::setCacheDir(const QDir& path) { doPersistentCaching = true; cacheDir = path; if (!cacheDir.exists()) { cacheDir.mkpath(cacheDir.absolutePath()); } } bool ImageManager::saveTile(QString tileName,QPixmap tileData) { tileName.replace("/","-"); QFile file(cacheDir.absolutePath() + "/" + tileName.toAscii().toBase64()); qDebug() << "writing: " << file.fileName(); if (!file.open(QIODevice::ReadWrite )){ qDebug()<<"error reading file"; return false; } QByteArray bytes; QBuffer buffer(&bytes); buffer.open(QIODevice::WriteOnly); tileData.save(&buffer, "PNG"); file.write(bytes); file.close(); return true; } bool ImageManager::loadTile(QString tileName,QPixmap &tileData) { tileName.replace("/","-"); QFile file(cacheDir.absolutePath() + "/" + tileName.toAscii().toBase64()); if (!file.open(QIODevice::ReadOnly )) { return false; } tileData.loadFromData( file.readAll() ); file.close(); return true; } bool ImageManager::tileExist(QString tileName) { tileName.replace("/","-"); QFile file(cacheDir.absolutePath() + "/" + tileName.toAscii().toBase64()); if (file.exists()) return true; else return false; } }