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// webgrab/PrinterWE.cpp - This file is part of eln
/* eln is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
eln is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with eln. If not, see <http://www.gnu.org/licenses/>.
*/
// PrinterWE.C
#include "PrinterWE.h"
#include <QPrinter>
#include <QPainter>
#include <QTemporaryFile>
#include <QProcess>
#include <QPrintDialog>
#include <QDebug>
#include <QWebEngineView>
#include <QApplication>
#include <stdio.h>
#include <QSvgGenerator>
#include <QFile>
#include <QPdfDocument>
PrinterWE::PrinterWE(QWebEngineView *src, Options const &opt):
src(src), opt(opt) {
havesize = false;
}
PrinterWE::~PrinterWE() {
}
void PrinterWE::display() {
QSize si = src->page()->contentsSize().toSize();
if (!si.isEmpty() && !havesize) {
havesize = true;
si += QSize(4, 4);
if (si.width()>1100) {
si.setWidth(1100);
si.setHeight(si.height() + 30); // make space for scroll bar
}
if (si.height()>1100) {
si.setHeight(1100);
si.setWidth(si.width() + 30); // make space for scroll bar
}
src->resize(si); // adjust window size
}
QSize si2 = src->page()->contentsSize().toSize();
}
void PrinterWE::complete(bool ok) {
qDebug() << "complete";
if (!ok) {
fprintf(stderr, "webgrab: Failed to load web page");
QApplication::exit(2);
return;
}
if (opt.out.isEmpty()) {
src->show();
} else {
foreach (QString fn, opt.out) {
if (fn.endsWith(".pdf")) {
toPdf(fn);
return;
}
}
// no pdf is requested, we'll make a temporary pdf
toPdf("");
}
}
void PrinterWE::sizeChange(QSizeF const &) {
display();
}
void PrinterWE::toPdf(QString fn) {
if (opt.paginate)
toMultiPagePdf(fn);
else
toSinglePagePdf(fn);
}
static bool allequalx(QImage const &img, int y, int x0, int x1, QRgb bg) {
for (int x=x0; x<x1; x++)
if (img.pixel(x,y)!=bg)
return false;
return true;
}
static bool allequaly(QImage const &img, int x, int y0, int y1, QRgb bg) {
for (int y=y0; y<y1; y++)
if (img.pixel(x,y)!=bg)
return false;
return true;
}
static QImage autotrim(QImage const &img) {
int X = img.width();
int Y = img.height();
if (X<=1 || Y<=1)
return img;
QRgb bg(img.pixel(X-1, Y-1));
int y1 = Y;
while (y1>1)
if (allequalx(img, y1-1, 0, X, bg))
--y1;
else
break;
int x1 = X;
while (x1>1)
if (allequaly(img, x1-1, 0, y1, bg))
--x1;
else
break;
int x0 = 0;
while (x0<x1-1)
if (allequaly(img, x0, 0, y1, bg))
x0++;
else
break;
int y0 = 0;
while (y0<y1-1)
if (allequalx(img, y0, x0, x1, bg))
y0++;
else
break;
qDebug() << X << Y << x0 << y0 << x1 << y1;
if (x0==0 && y0==0 && x1==X && y1==Y)
return img;
else
return img.copy(x0, y0, x1-x0, y1-y0);
}
class Receiver {
public:
Receiver(QString fn, Options const &opt):
fn(fn), opt(opt) {
}
void operator()(QByteArray const &ar) {
QFile *f = fn.isEmpty() ? new QTemporaryFile : new QFile(fn);
if (f->open(QFile::WriteOnly)) {
f->write(ar);
f->close();
convert(f->fileName());
QApplication::exit(0);
} else {
qDebug() << "Cannot open" << fn;
QApplication::exit(2);
}
}
void convert(QString pdffn) {
bool mustdo = false;
foreach (QString ofn, opt.out)
if (ofn != pdffn)
mustdo = true;
if (!mustdo)
return;
QPdfDocument pdf;
pdf.load(pdffn);
if (pdf.pageCount()<1) {
qDebug() << "No pages in pdf" << pdffn;
QApplication::exit(2);
}
/* Ugly section follows to deal with unannounced API change in Qt PDF */
#if QT_VERSION >= QT_VERSION_CHECK(6, 4, 0)
QSizeF ptsize = pdf.pagePointSize(0);
#else
QSizeF ptsize = pdf.pageSize(0);
#endif
/* End of ugly section */
QSize outsize(opt.imSize,
int(opt.imSize*ptsize.height()/ptsize.width()));
QImage img = autotrim(pdf.render(0, outsize));
foreach (QString ofn, opt.out)
if (ofn != pdffn)
img.save(ofn);
}
private:
QString fn;
Options const &opt;
};
void PrinterWE::toMultiPagePdf(QString fn) {
Receiver *recv = new Receiver(fn, opt);
QPageLayout layout(QPageSize(QPageSize::Letter),
QPageLayout::Portrait,
QMarginsF());
src->page()->printToPdf(*recv, layout);
}
void PrinterWE::toSinglePagePdf(QString fn) {
toMultiPagePdf(fn);
// single-page pdf not supported in WebEngine.
}
void PrinterWE::featureReq(QUrl const &url, QWebEnginePage::Feature f) {
src->page()->setFeaturePermission(url, f,
QWebEnginePage::PermissionDeniedByUser);
}
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