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#include "pagerenderer.h"
#include <QPainter>
#include <QPdfDocument>
#include <QLoggingCategory>
#include <QElapsedTimer>
#include <QUrl>
#include <QNetworkRequest>
#include <QNetworkReply>
Q_DECLARE_LOGGING_CATEGORY(lcExample)
PageRenderer::PageRenderer()
: m_networkAccessManager(new QNetworkAccessManager(this))
, m_minRenderTime(1000000000.)
, m_maxRenderTime(0.)
, m_totalRenderTime(0.)
, m_totalPagesRendered(0)
{
qRegisterMetaType<QVector<QSizeF> >();
m_workerThread.start();
moveToThread(&m_workerThread);
connect(&m_doc, SIGNAL(documentLoadStarted()), this, SLOT(reportPageSizes()));
connect(&m_doc, SIGNAL(pageAvailable(int)), this, SLOT(renderPageIfRequested(int)));
}
PageRenderer::~PageRenderer()
{
m_workerThread.exit();
}
void PageRenderer::openDocument(const QUrl &location)
{
QMetaObject::invokeMethod(this, "loadDocumentImpl", Qt::QueuedConnection, Q_ARG(QUrl, location));
}
void PageRenderer::requestPage(int page, qreal zoom)
{
QMetaObject::invokeMethod(this, "requestPageImpl", Qt::QueuedConnection, Q_ARG(int, page), Q_ARG(qreal, zoom));
}
void PageRenderer::reportPageSizes()
{
QVector<QSizeF> sizes;
for (int i = 0, count = m_doc.pageCount(); i < count; ++i)
sizes << m_doc.pageSize(i);
emit pageSizesAvailable(sizes);
if (!m_renderRequests.isEmpty())
QMetaObject::invokeMethod(this, "renderPages", Qt::QueuedConnection);
}
void PageRenderer::loadDocumentImpl(const QUrl &url)
{
m_renderRequests.clear();
QNetworkReply *reply = m_networkAccessManager->get(QNetworkRequest(url));
connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(handleNetworkRequestError()));
m_doc.load(reply);
connect(&m_doc, SIGNAL(documentLoadFinished()), reply, SLOT(deleteLater()));
}
void PageRenderer::requestPageImpl(int page, qreal zoom)
{
RenderRequest newRequest;
newRequest.page = page;
newRequest.zoom = zoom;
m_renderRequests << newRequest;
if (!m_doc.isLoading())
QMetaObject::invokeMethod(this, "renderPages", Qt::QueuedConnection);
}
void PageRenderer::renderPages()
{
for (int i = 0; i < m_renderRequests.count(); ++i) {
if (!m_doc.canRender(m_renderRequests.at(i).page))
continue;
RenderRequest request = m_renderRequests.takeAt(i);
QSizeF size = m_doc.pageSize(request.page) * request.zoom;
QElapsedTimer timer; timer.start();
QImage img = m_doc.render(request.page, size);
qreal secs = timer.nsecsElapsed() / 1000000000.0;
if (secs < m_minRenderTime)
m_minRenderTime = secs;
if (secs > m_maxRenderTime)
m_maxRenderTime = secs;
m_totalRenderTime += secs;
++m_totalPagesRendered;
emit pageReady(request.page, request.zoom, img);
qCDebug(lcExample) << "page" << request.page << "zoom" << request.zoom << "size" << size << "in" << secs <<
"secs; min" << m_minRenderTime <<
"avg" << m_totalRenderTime / m_totalPagesRendered <<
"max" << m_maxRenderTime;
break;
}
}
void PageRenderer::renderPageIfRequested(int page)
{
renderPages();
}
void PageRenderer::handleNetworkRequestError()
{
qDebug() << static_cast<QNetworkReply*>(sender())->errorString();
}
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