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Implement several new print scaling options

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This patch introduces the choice between three scaling
options for printing:

* Fit to printable area
* Fit to full page
* No scaling

The new options only work with the QPrinter backend.  Therefore
they are only enabled if 'force rasterization' is selected.

Differential Revision: https://phabricator.kde.org/D7962
This commit is contained in:
Oliver Sander 2018-09-23 15:33:02 +02:00
parent 677fc76760
commit 2e97d58750
1 changed files with 68 additions and 1 deletions
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69
generators/poppler/generator_pdf.cpp
View file

@ -26,6 +26,7 @@
#include <qstack.h>
#include <qtemporaryfile.h>
#include <qtextstream.h>
#include <QComboBox>
#include <QPrinter>
#include <QPainter>
#include <QTimer>
@ -76,8 +77,26 @@ static const int defaultPageHeight = 842;
class PDFOptionsPage : public QWidget
{
Q_OBJECT
public slots:
void enableOrDisableScaleMode()
{
m_scaleMode->setEnabled ( m_forceRaster->isChecked() );
if ( m_forceRaster->isChecked() ) {
m_scaleMode->setToolTip( i18n( "Scaling mode for the printed pages" ) );
} else {
m_scaleMode->setToolTip( i18n( "Select rasterization to enable this!" ) );
}
}
public:
enum ScaleMode {
FitToPrintableArea,
FitToPage,
None
};
Q_ENUM(ScaleMode)
PDFOptionsPage()
{
setWindowTitle( i18n( "PDF Options" ) );
@ -90,8 +109,26 @@ class PDFOptionsPage : public QWidget
m_forceRaster->setToolTip(i18n("Rasterize into an image before printing"));
m_forceRaster->setWhatsThis(i18n("Forces the rasterization of each page into an image before printing it. This usually gives somewhat worse results, but is useful when printing documents that appear to print incorrectly."));
layout->addWidget(m_forceRaster);
QWidget* formWidget = new QWidget(this);
QFormLayout* printBackendLayout = new QFormLayout(formWidget);
m_scaleMode = new QComboBox;
m_scaleMode->insertItem(FitToPrintableArea, i18n("Fit to printable area"), FitToPrintableArea);
m_scaleMode->insertItem(FitToPage, i18n("Fit to full page"), FitToPage);
m_scaleMode->insertItem(None, i18n("None; print original size"), None);
m_scaleMode->setToolTip(i18n("Select rasterization to enable this!"));
printBackendLayout->addRow(i18n("Scale mode:"), m_scaleMode);
layout->addWidget(formWidget);
layout->addStretch(1);
// Enable scaleMode only if the file is to be rasterized before printing
m_scaleMode->setEnabled( false );
connect( m_forceRaster, &QCheckBox::stateChanged, this, &PDFOptionsPage::enableOrDisableScaleMode );
#if defined(Q_OS_WIN) && !defined HAVE_POPPLER_0_60
m_printAnnots->setVisible( false );
#endif
@ -118,9 +155,15 @@ class PDFOptionsPage : public QWidget
m_forceRaster->setChecked( forceRaster );
}
ScaleMode scaleMode() const
{
return m_scaleMode->currentData().value<ScaleMode>();
}
private:
QCheckBox *m_printAnnots;
QCheckBox *m_forceRaster;
QComboBox *m_scaleMode;
};
@ -1291,11 +1334,13 @@ bool PDFGenerator::print( QPrinter& printer )
{
bool printAnnots = true;
bool forceRasterize = false;
PDFOptionsPage::ScaleMode scaleMode = PDFOptionsPage::FitToPrintableArea;
if ( pdfOptionsPage )
{
printAnnots = pdfOptionsPage->printAnnots();
forceRasterize = pdfOptionsPage->printForceRaster();
scaleMode = pdfOptionsPage->scaleMode();
}
#ifdef Q_OS_WIN
@ -1317,6 +1362,11 @@ bool PDFGenerator::print( QPrinter& printer )
if ( forceRasterize && printAnnots)
{
#endif
// If requested, scale to full page instead of the printable area
if ( scaleMode == PDFOptionsPage::FitToPage )
printer.setFullPage( true );
QPainter painter;
painter.begin(&printer);
@ -1333,13 +1383,30 @@ bool PDFGenerator::print( QPrinter& printer )
Poppler::Page *pp = pdfdoc->page( page );
if (pp)
{
QSizeF pageSize = pp->pageSizeF(); // Unit is 'points' (i.e., 1/72th of an inch)
QRect painterWindow = painter.window(); // Unit is 'QPrinter::DevicePixel'
// Default: no scaling at all, but we need to go from DevicePixel units to 'points'
// Warning: We compute the horizontal scaling, and later assume that the vertical scaling will be the same.
double scaling = printer.paperRect(QPrinter::DevicePixel).width() / printer.paperRect(QPrinter::Point).width();
if ( scaleMode != PDFOptionsPage::None )
{
// Get the two scaling factors needed to fit the page onto paper horizontally or vertically
auto horizontalScaling = painterWindow.width() / pageSize.width();
auto verticalScaling = painterWindow.height() / pageSize.height();
// We use the smaller of the two for both directions, to keep the aspect ratio
scaling = std::min(horizontalScaling, verticalScaling);
}
#ifdef Q_OS_WIN
QImage img = pp->renderToImage( printer.physicalDpiX(), printer.physicalDpiY() );
#else
// UNIX: Same resolution as the postscript rasterizer; see discussion at https://git.reviewboard.kde.org/r/130218/
QImage img = pp->renderToImage( 300, 300 );
#endif
painter.drawImage( painter.window(), img, QRectF(0, 0, img.width(), img.height()) );
painter.drawImage( QRectF( QPointF( 0, 0 ), scaling * pp->pageSizeF() ), img );
delete pp;
}
userMutex()->unlock();