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imagemanager.cpp
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186 lines (166 loc) · 5.04 KB
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/*
*
* 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 <http://www.gnu.org/licenses/>.
*
* Contact e-mail: kaiwinter@gmx.de
* Program URL : http://qmapcontrol.sourceforge.net/
*
*/
#include "imagemanager.h"
#include "mapnetwork.h"
#include <QCryptographicHash>
#include <QPainter>
#include <QDateTime>
static const int kDefaultTimeoutDelaySecs = 30;
static const int kDefaultPixmapCacheSizeKB = 20000;
namespace qmapcontrol
{
ImageManager::ImageManager(QObject *parent)
: QObject(parent)
, emptyPixmap(QPixmap(1, 1))
, loadingPixmap(QPixmap(256, 256))
, net(new MapNetwork(this))
, diskCache(new QNetworkDiskCache(this))
{
emptyPixmap.fill(Qt::transparent);
// initialize loading image
loadingPixmap.fill(Qt::transparent);
QPainter paint(&loadingPixmap);
QBrush brush(Qt::lightGray, Qt::Dense5Pattern);
paint.fillRect(loadingPixmap.rect(), brush);
paint.end();
if (QPixmapCache::cacheLimit() <= kDefaultPixmapCacheSizeKB)
{
QPixmapCache::setCacheLimit(kDefaultPixmapCacheSizeKB);
}
}
ImageManager::~ImageManager()
{
delete net;
net = 0;
}
QPixmap ImageManager::getImage(const QString &host, const QString &url)
{
// qDebug() << "ImageManager::getImage";
QPixmap pm;
if (net->imageIsLoading(url))
{
// currently loading an image
return loadingPixmap;
}
else if (QPixmapCache::find(url, &pm))
{
// image found in cache, use this version
return pm;
}
// is image cached (memory)
else if (QPixmapCache::find(url, &pm) && !pm.isNull())
{
// we had a valid copy cached in memory (not disk) so return this
return pm;
}
else if (failedFetches.contains(url)
&& failedFetches[url].secsTo(QDateTime::currentDateTime())
< kDefaultTimeoutDelaySecs)
{
// prevents spamming public servers when requests fail to return an image or
// server returns error code (busy/ivalid useragent etc)
qDebug() << "Ignored: " << url
<< " - last request failed less than 30 seconds ago";
}
else
{
// load from net, add empty image
net->loadImage(host, url);
}
return emptyPixmap;
}
QPixmap ImageManager::prefetchImage(const QString &host, const QString &url)
{
// TODO See if this actually helps on the N900 & Symbian Phones
#if defined Q_WS_QWS || defined Q_WS_MAEMO_5 || defined Q_WS_S60
// on mobile devices we don´t want the display refreshing 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);
// remove from failed list (if exists) as it has now come good
if (failedFetches.contains(url))
{
failedFetches.remove(url);
}
if (!prefetch.contains(url))
{
emit imageReceived();
}
else
{
#if defined Q_WS_QWS || defined Q_WS_MAEMO_5 || defined Q_WS_S60
prefetch.remove(prefetch.indexOf(url));
#endif
}
}
void ImageManager::loadingQueueEmpty()
{
emit loadingFinished();
}
void ImageManager::abortLoading()
{
net->abortLoading();
}
void ImageManager::setProxy(QString host, int port, const QString username,
const QString password)
{
net->setProxy(host, port, username, password);
}
void ImageManager::setCacheDir(const QDir &path, const int qDiskSizeMB)
{
if (!path.absolutePath().isEmpty())
{
QDir cacheDir = path;
if (!cacheDir.exists())
{
cacheDir.mkpath(cacheDir.absolutePath());
}
diskCache->setCacheDirectory(cacheDir.absolutePath());
diskCache->setMaximumCacheSize(qDiskSizeMB * 1024 * 1024); // Megabytes to bytes
net->setDiskCache(diskCache);
}
else
{
net->setDiskCache(0);
}
}
int ImageManager::loadQueueSize() const
{
return net->loadQueueSize();
}
void qmapcontrol::ImageManager::fetchFailed(const QString &url)
{
qDebug() << "ImageManager::fetchFailed" << url;
// store current time for this failed image to prevent loading it again until
failedFetches.insert(url, QDateTime::currentDateTime());
}
}