diff options
Diffstat (limited to 'examples/widgets/pdfviewer/pagerenderer.cpp')
| -rw-r--r-- | examples/widgets/pdfviewer/pagerenderer.cpp | 113 |
1 files changed, 74 insertions, 39 deletions
diff --git a/examples/widgets/pdfviewer/pagerenderer.cpp b/examples/widgets/pdfviewer/pagerenderer.cpp index fca4a0f..5270728 100644 --- a/examples/widgets/pdfviewer/pagerenderer.cpp +++ b/examples/widgets/pdfviewer/pagerenderer.cpp @@ -4,69 +4,104 @@ #include <QLoggingCategory> #include <QElapsedTimer> #include <QUrl> +#include <QNetworkRequest> +#include <QNetworkReply> Q_DECLARE_LOGGING_CATEGORY(lcExample) PageRenderer::PageRenderer() - : QThread(Q_NULLPTR) - , m_doc(new QPdfDocument(this)) - , m_page(0) - , m_zoom(1.) + : 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(); } -QVector<QSizeF> PageRenderer::openDocument(const QUrl &location) +void 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; + 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::requestPage(int page, qreal zoom, Priority priority) +void PageRenderer::loadDocumentImpl(const QUrl &url) { - // TODO maybe queue up the requests - m_page = page; - m_zoom = zoom; - start(priority); + 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::run() +void PageRenderer::requestPageImpl(int page, qreal zoom) { - renderPage(m_page, m_zoom); + RenderRequest newRequest; + newRequest.page = page; + newRequest.zoom = zoom; + m_renderRequests << newRequest; + if (!m_doc.isLoading()) + QMetaObject::invokeMethod(this, "renderPages", Qt::QueuedConnection); } -void PageRenderer::renderPage(int page, qreal zoom) +void PageRenderer::renderPages() { - 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); + 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); - qCDebug(lcExample) << "page" << page << "zoom" << m_zoom << "size" << size << "in" << secs << - "secs; min" << m_minRenderTime << - "avg" << m_totalRenderTime / m_totalPagesRendered << - "max" << m_maxRenderTime; + 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(); } |