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#include "pagerenderer.h"
#include <QPainter>
#include <QPdfDocument>
#include <QLoggingCategory>
#include <QElapsedTimer>
#include <QUrl>
Q_DECLARE_LOGGING_CATEGORY(lcExample)
PageRenderer::PageRenderer()
: QThread(Q_NULLPTR)
, m_doc(new QPdfDocument(this))
, m_page(0)
, m_zoom(1.)
, m_minRenderTime(1000000000.)
, m_maxRenderTime(0.)
, m_totalRenderTime(0.)
, m_totalPagesRendered(0)
{
}
PageRenderer::~PageRenderer()
{
}
QVector<QSizeF> PageRenderer::openDocument(const QUrl &location)
{
if (location.isLocalFile())
m_doc.load(location.toLocalFile());
else {
qCWarning(lcExample, "non-local file loading is not implemented");
return QVector<QSizeF>();
}
// TODO maybe do in run() if it takes too long
QVector<QSizeF> pageSizes;
for (int page = 0; page < m_doc.pageCount(); ++page)
pageSizes.append(m_doc.pageSize(page));
return pageSizes;
}
void PageRenderer::requestPage(int page, qreal zoom, Priority priority)
{
// TODO maybe queue up the requests
m_page = page;
m_zoom = zoom;
start(priority);
}
void PageRenderer::run()
{
renderPage(m_page, m_zoom);
}
void PageRenderer::renderPage(int page, qreal zoom)
{
QSizeF size = m_doc.pageSize(page) * m_zoom;
QElapsedTimer timer; timer.start();
const QImage &img = m_doc.render(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(page, zoom, img);
qCDebug(lcExample) << "page" << page << "zoom" << m_zoom << "size" << size << "in" << secs <<
"secs; min" << m_minRenderTime <<
"avg" << m_totalRenderTime / m_totalPagesRendered <<
"max" << m_maxRenderTime;
}
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