109 γραμμές
2.5 KiB
C++
109 γραμμές
2.5 KiB
C++
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#include <QApplication>
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#include <QScreen>
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#include <QDebug>
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#include <QScopedPointer>
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#include <QMutexLocker>
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#include <QtConcurrent/QtConcurrent>
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#include <QtConcurrent/QtConcurrentMap>
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#include <QPainter>
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#include <atomic>
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#include "pdfworker.h"
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static QMutex cacheMutex;
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struct Renderer
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{
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typedef PdfPreview result_type;
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double scaleX;
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double scaleY;
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QHash<QString, Poppler::Document *> documentcache;
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QVector<QString> wordsToHighlight;
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Renderer(double scaleX, double scaleY, QVector<QString> wordsToHighlight)
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{
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this->scaleX = scaleX;
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this->scaleY = scaleY;
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this->wordsToHighlight = wordsToHighlight;
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}
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~Renderer()
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{
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qDeleteAll(documentcache);
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}
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Poppler::Document *document(QString path)
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{
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if(documentcache.contains(path))
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{
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return documentcache.value(path);
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}
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Poppler::Document *result = Poppler::Document::load(path);
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if(result == nullptr)
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{
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// TODO: some kind of user feedback would be nice
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return nullptr;
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}
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result->setRenderHint(Poppler::Document::TextAntialiasing);
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QMutexLocker locker(&cacheMutex);
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documentcache.insert(path, result);
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locker.unlock();
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return result;
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}
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PdfPreview operator()(const PdfPreview &preview)
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{
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PdfPreview result = preview;
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Poppler::Document *doc = document(preview.documentPath);
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if(doc == nullptr)
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{
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return preview;
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}
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if(doc->isLocked())
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{
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return preview;
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}
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int p = (int)preview.page - 1;
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if(p < 0)
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{
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p = 0;
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}
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Poppler::Page *pdfPage = doc->page(p);
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QImage img = pdfPage->renderToImage(scaleX, scaleY);
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for(QString &word : wordsToHighlight)
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{
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QList<QRectF> rects = pdfPage->search(word, Poppler::Page::SearchFlag::IgnoreCase);
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for(QRectF &rect : rects)
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{
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QPainter painter(&img);
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painter.scale(scaleX / 72.0, scaleY / 72.0);
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painter.fillRect(rect, QColor(255, 255, 0, 64));
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}
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}
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result.previewImage = img;
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return result;
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}
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};
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QFuture<PdfPreview> PdfWorker::generatePreviews(const QVector<SearchResult> paths, QVector<QString> wordsToHighlight,
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double scalefactor)
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{
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QVector<PdfPreview> previews;
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for(const SearchResult &sr : paths)
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{
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for(int page : sr.pages)
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{
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PdfPreview p;
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p.documentPath = sr.fileData.absPath;
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p.page = page;
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previews.append(p);
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}
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}
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double scaleX = QGuiApplication::primaryScreen()->physicalDotsPerInchX() * scalefactor;
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double scaleY = QGuiApplication::primaryScreen()->physicalDotsPerInchY() * scalefactor;
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QSettings setting;
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return QtConcurrent::mapped(previews, Renderer(scaleX, scaleY, wordsToHighlight));
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}
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