diff options
Diffstat (limited to 'src-qt5/desktop-utils')
-rw-r--r-- | src-qt5/desktop-utils/lumina-pdf/mainUI.cpp | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/src-qt5/desktop-utils/lumina-pdf/mainUI.cpp b/src-qt5/desktop-utils/lumina-pdf/mainUI.cpp index 7ad42697..1fb366ab 100644 --- a/src-qt5/desktop-utils/lumina-pdf/mainUI.cpp +++ b/src-qt5/desktop-utils/lumina-pdf/mainUI.cpp @@ -155,11 +155,22 @@ void MainUI::loadFile(QString path){ } void MainUI::loadPage(int num, Poppler::Document *doc, MainUI *obj, QSize dpi, QSizeF page){ + //PERFORMANCE NOTES: + // Using Poppler to scale the image (adjust dpi value) helps a bit but you take a large CPU loading hit (and still quite a lot of pixelization) + // Using Qt to scale the image (adjust page value) smooths out the image quite a bit without a lot of performance loss (but cannot scale up without pixelization) + // The best approach seams to be to increase the DPI a bit, but match that with the same scaling on the page size (smoothing) + //qDebug() << " - Render Page:" << num; Poppler::Page *PAGE = doc->page(num); if(PAGE!=0){ - //qDebug() << "DPI:" << 4*dpi; - loadingHash.insert(num, PAGE->renderToImage(4*dpi.width(), 4*dpi.height()).scaled(2*page.width(), 2*page.height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation) ); + //qDebug() << "DPI:" << dpi << "Size:" << page << "Page Size (pt):" << PAGE->pageSize(); + float scalefactor = (dpi.width()/72.0); //How different the screen DPI compares to standard page DPI + //qDebug() << "Scale Factor:" << scalefactor; + QImage raw = PAGE->renderToImage((scalefactor+0.2)*dpi.width(), (scalefactor+0.2)*dpi.height()); //make the raw image a tiny bit larger than the end result + //qDebug() << " - Raw Image Size:" << raw.size(); + loadingHash.insert(num, raw.scaled(scalefactor*page.width(), scalefactor*page.height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation) ); + raw = QImage(); //clear it + //qDebug() << "Page Label:" << num << PAGE->label(); /* QList<Annotation*> anno = PAGE->annotations(Annotations::AText ); QStringList annoS; @@ -286,6 +297,11 @@ void MainUI::startLoadingPages(QPrinter *printer){ progAct->setVisible(true); QRectF pageSize = printer->pageRect(QPrinter::DevicePixel); QSize DPI(printer->resolution(),printer->resolution()); + /*qDebug() << "Screen Resolutions:"; + QList<QScreen*> screens = QApplication::screens(); + for(int i=0; i<screens.length(); i++){ + qDebug() << screens[i]->name() << screens[i]->logicalDotsPerInchX() << screens[i]->logicalDotsPerInchY(); + }*/ for(int i=0; i<numPages; i++){ //qDebug() << " - Kickoff page load:" << i; QtConcurrent::run(this, &MainUI::loadPage, i, DOC, this, DPI, pageSize.size() ); |