File indexing completed on 2024-05-19 04:36:37

 /* This file is part of the TikZKit project.
  *
  * Copyright (C) 2013 Dominik Haumann <dhaumann@kde.org>
  *
  * This library is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Library General Public License as published
  * by the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This library 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 Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, see
  * <http://www.gnu.org/licenses/>.
  */
 
 #include "PdfRenderer.h"
 
 #include <QPainter>
 #include <QPixmap>
 
 #include <QDebug>
 
 #include <poppler-qt4.h>
 
 namespace tex {
 
 class PdfRendererPrivate
 {
     public:
         QPixmap pixmap;
         Poppler::Document * document;
 };
 
 PdfRenderer::PdfRenderer(QObject* parent)
     : QObject(parent)
     , d(new PdfRendererPrivate())
 {
     d->document = 0;
 }
 
 PdfRenderer::~PdfRenderer()
 {
     delete d;
 }
 
 void PdfRenderer::loadPdf(const QString& filename)
 {
     delete d->document;
     d->document = Poppler::Document::load(filename);
 }
 
 QPixmap PdfRenderer::render(qreal physicalDpiX, qreal physicalDpiY)
 {
     if (!d->document) {
         return QPixmap();
     }
 
     const int page = 0;
     d->document->setRenderBackend(Poppler::Document::ArthurBackend);
     d->document->setRenderHint(Poppler::Document::Antialiasing, true);
     d->document->setRenderHint(Poppler::Document::TextAntialiasing, true);
     d->document->setRenderHint(Poppler::Document::TextHinting, true);
     d->document->setRenderHint(Poppler::Document::TextSlightHinting, true);
     d->document->setPaperColor(Qt::transparent);
     QImage image = d->document->page(page)->renderToImage(physicalDpiX, physicalDpiY);
 
     //BEGIN hack: convert white background to transparent
     struct ArgbData {
         unsigned char b, g, r, a;
     };
     const int imageWidth = image.width();
     const int imageHeight = image.height();
 
     for (int x=0; x<imageHeight; ++x) {
         ArgbData* scanLine = reinterpret_cast<ArgbData*>(image.scanLine(x));
         for (int y=0; y<imageWidth; ++y) {
             ArgbData* unit = &scanLine[y];
             unit->a = 0xff - unit->r;
             unit->r = unit->g = unit->b = 0;
         }
     }
     //END hack
     d->pixmap = QPixmap::fromImage(image);
     return d->pixmap;
 }
 
 }
 
 // kate: indent-width 4; replace-tabs on;