pdfpager.cpp (40)

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#include "pdfpager.h"
#include "common.h"

PDFPager::PDFPager() :
    pdf(NULL),
    pageRange(this),
    m_pageNum(-1),
    m_renderSize(600,600)
{
}

void PDFPager::openPDF(QString fpath)
{
    m_path = fpath;
    pdf = Poppler::Document::load(fpath);
    if (!pdf || pdf->isLocked())
    {
        delete pdf;
        pdf = NULL;
        return;
    }
    qDebug("open pdf success");
    int pages = pdf->numPages();
    emit opened(fpath, pages);
    emit numPages(pages);
    for (int p = 0; p < pages; ++p)
    {
        Poppler::Page* pdfPage = pdf->page(p);
        if (pdfPage)
            emit thumbnail(p, pdfPage->thumbnail(), pdfPage->label());
    }
    page(0);
    pageRange.setRange(0, pages - 1);
}

void PDFPager::page(int pnum)
{
    if (pnum < 0)
        return;

    m_pageNum = pnum;
    render(pnum);
}

void PDFPager::renderSize(QSize s)
{
qDebug("renderSize(%d x %d)", s.width(), s.height());
    m_renderSize = s;
    page(m_pageNum);
}

void PDFPager::render(int pnum, QSize renderSize)
{
//qDebug("render(%d, %d x %d)", pnum, renderSize.width(), renderSize.height());
    if (pnum >= pdf->numPages())
        return;
    if (!renderSize.isValid())
        renderSize = m_renderSize;
    emit rendering(true);
    // Access page of the PDF file
    if (!pdf)
        return;
    Poppler::Page* pdfPage = pdf->page(pnum);  // Document starts at page 0
    if (!pdfPage)
    {
      // ... error message ...
        emit rendering(false);
        return;
    }

    // Generate a QImage of the rendered page
    double res = MIN(((double)(renderSize.width())) /       // dots
                        (pdfPage->pageSizeF().width() / 72.0),  // inches
                    ((double)(renderSize.height())) /       // dots
                        (pdfPage->pageSizeF().height() / 72.0));    // inches

//qDebug("renderToImage: res %f to fit %d x %d", res, renderSize.width(), renderSize.height());

    // @hack For now, fix the res at 72, because that way 1 point = 1 model unit,
    // which helps the text items to match the image.
    res = 72.0;

    QImage image = pdfPage->renderToImage(res, res);//, 0, 0, 1000, 1000);
    if (image.isNull())
    {
      // ... error message ...
        emit rendering(false);
        return;
    }
//qDebug("renderDone: %d x %d", image.width(), image.height());

    emit pageChanged(pnum);
    QString label = pdfPage->label();
    if (label.isEmpty())
        label = QString::number(pnum);
    emit pageChanged(label);
    renderDone(pnum, image);
    QList<Poppler::TextBox*> textBoxen = pdfPage->textList();
    QStringList strings;
    foreach(Poppler::TextBox* box, textBoxen)
        strings << box->text();
    m_text = strings.join(" ");
//  qDebug() << "joined text items on this page:" << m_text;
    emit pageText(textBoxen);
    // after reading everything of interest, the page can be deleted
    // (pdf->page(pnum) resulted in ownership of that copy of the data,
    // so this function is responsible to delete it)
    delete pdfPage;
}

void PDFPager::renderDone(int pnum, QImage pm)
{
    emit rendered(pnum, pm);
    emit rendering(false);
}

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