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/* ============================================================
*
* This file is a part of the rekonq project
*
* Copyright (C) 2009-2012 by Andrea Diamantini <adjam7 at gmail dot com>
* Copyright (C) 2010 by Matthieu Gicquel <matgic78 at gmail dot com>
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License or (at your option) version 3 or any later version
* accepted by the membership of KDE e.V. (or its successor approved
* by the membership of KDE e.V.), which shall act as a proxy
* defined in Section 14 of version 3 of the license.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* ============================================================ */
// Self Includes
#include "websnap.h"
#include "websnap.moc"
// KDE Includes
#include <KStandardDirs>
// Qt Includes
#include <QSize>
#include <QFile>
#include <QCryptographicHash>
#include <QPainter>
#include <QAction>
#include <QWebFrame>
#include <QWebSettings>
WebSnap::WebSnap(const QUrl& url, QObject *parent)
: QObject(parent)
, m_url(url)
{
// this to not register websnap history
m_page.settings()->setAttribute(QWebSettings::PrivateBrowsingEnabled, true);
// this to not let this page open other windows
m_page.settings()->setAttribute(QWebSettings::PluginsEnabled, false);
m_page.settings()->setAttribute(QWebSettings::JavascriptEnabled, false);
connect(&m_page, SIGNAL(loadFinished(bool)), this, SLOT(saveResult(bool)));
QMetaObject::invokeMethod(this, "load", Qt::QueuedConnection);
}
WebSnap::~WebSnap()
{
m_page.action(QWebPage::Stop)->trigger();
m_page.deleteLater();
}
void WebSnap::load()
{
m_page.mainFrame()->load(m_url);
}
QPixmap WebSnap::render(const QWebPage &page, int w, int h)
{
// create the page image
QPixmap pageImage = QPixmap(w, h);
pageImage.fill(Qt::transparent);
// render it
QPainter p(&pageImage);
page.mainFrame()->render(&p, QWebFrame::ContentsLayer);
p.end();
return pageImage;
}
// NOTE
// to render page preview in a safe way, you CANNOT work with scrollbars!
// In fact, disabling temporarily them DOES NOT work without reloading a page
// that is something we CANNOT do.
QPixmap WebSnap::renderPagePreview(const QWebPage &page, int w, int h)
{
// store actual viewportsize
QSize oldSize = page.viewportSize();
// prepare page
// NOTE: I saw some sites with strange CMS and with absurd content size width (eg: 8584553)
// This usually leads setViewportSize to crash :(
// So, ensure renderWidth is no more than 2000.
int renderWidth = page.mainFrame()->contentsSize().width();
if (renderWidth > 2000)
renderWidth = 2000;
int renderHeight = renderWidth * ((0.0 + h) / w);
page.setViewportSize(QSize(renderWidth, renderHeight));
// consider scrollbars and render the page
bool verticalScrollBarActive = !page.mainFrame()->scrollBarGeometry(Qt::Vertical).isEmpty();
if (verticalScrollBarActive)
renderWidth -= 15;
bool horizontalScrollBarActive = !page.mainFrame()->scrollBarGeometry(Qt::Horizontal).isEmpty();
if (horizontalScrollBarActive)
renderHeight -= 15;
QPixmap pageImage = WebSnap::render(page, renderWidth, renderHeight);
// resize image
pageImage = pageImage.scaled(w, h, Qt::KeepAspectRatioByExpanding, Qt::SmoothTransformation);
// restore page state
page.setViewportSize(oldSize);
return pageImage;
}
QString WebSnap::imagePathFromUrl(const QUrl &url)
{
QByteArray name = url.toEncoded(QUrl::RemoveScheme | QUrl::RemoveUserInfo | QUrl::StripTrailingSlash);
QByteArray hashedName = QCryptographicHash::hash(name, QCryptographicHash::Md5).toHex();
return KStandardDirs::locateLocal("cache", QString("thumbs/") + hashedName + ".png", true);
}
void WebSnap::saveResult(bool ok)
{
if (ok)
{
QPixmap image = renderPagePreview(m_page, defaultWidth, defaultHeight);
QString path = imagePathFromUrl(m_url);
QFile::remove(path);
image.save(path);
}
emit snapDone(ok);
this->deleteLater();
}
bool WebSnap::existsImage(const QUrl &u)
{
return QFile::exists(imagePathFromUrl(u));
}
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