diff options
Diffstat (limited to 'src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp')
| -rw-r--r-- | src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp b/src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp new file mode 100644 index 000000000..4f610935c --- /dev/null +++ b/src/pdf/plugins/imageformats/pdf/qpdfiohandler.cpp @@ -0,0 +1,239 @@ +/**************************************************************************** +** +** Copyright (C) 2019 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the QtPDF module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL3$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPLv3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or later as published by the Free +** Software Foundation and appearing in the file LICENSE.GPL included in +** the packaging of this file. Please review the following information to +** ensure the GNU General Public License version 2.0 requirements will be +** met: http://www.gnu.org/licenses/gpl-2.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qpdfiohandler_p.h" +#include <QLoggingCategory> +#include <QPainter> + +QT_BEGIN_NAMESPACE + +Q_LOGGING_CATEGORY(qLcPdf, "qt.imageformat.pdf") + +QPdfIOHandler::QPdfIOHandler() +{ +} + +bool QPdfIOHandler::canRead() const +{ + if (!device()) + return false; + if (m_loaded) + return true; + if (QPdfIOHandler::canRead(device())) { + setFormat("pdf"); + return true; + } + return false; +} + +bool QPdfIOHandler::canRead(QIODevice *device) +{ + char buf[6]; + device->peek(buf, 6); + return (!qstrncmp(buf, "%PDF-", 5) || Q_UNLIKELY(!qstrncmp(buf, "\012%PDF-", 6))); +} + +int QPdfIOHandler::currentImageNumber() const +{ + return m_page; +} + +QRect QPdfIOHandler::currentImageRect() const +{ + return QRect(QPoint(0, 0), m_doc.pageSize(m_page).toSize()); +} + +int QPdfIOHandler::imageCount() const +{ + int ret = 0; + if (const_cast<QPdfIOHandler *>(this)->load(device())) + ret = m_doc.pageCount(); + qCDebug(qLcPdf) << "imageCount" << ret; + return ret; +} + +bool QPdfIOHandler::read(QImage *image) +{ + if (load(device())) { + if (m_page >= m_doc.pageCount()) + return false; + if (m_page < 0) + m_page = 0; + const bool xform = (m_clipRect.isValid() || m_scaledSize.isValid() || m_scaledClipRect.isValid()); + QSize pageSize = m_doc.pageSize(m_page).toSize(); + QSize finalSize = pageSize; + QRectF bounds; + if (xform && !finalSize.isEmpty()) { + bounds = QRectF(QPointF(0,0), QSizeF(finalSize)); + QPoint tr1, tr2; + QSizeF sc(1, 1); + if (m_clipRect.isValid()) { + tr1 = -m_clipRect.topLeft(); + finalSize = m_clipRect.size(); + } + if (m_scaledSize.isValid()) { + sc = QSizeF(qreal(m_scaledSize.width()) / finalSize.width(), + qreal(m_scaledSize.height()) / finalSize.height()); + finalSize = m_scaledSize; + pageSize = m_scaledSize; + } + if (m_scaledClipRect.isValid()) { + tr2 = -m_scaledClipRect.topLeft(); + finalSize = m_scaledClipRect.size(); + } + QTransform t; + t.translate(tr2.x(), tr2.y()); + t.scale(sc.width(), sc.height()); + t.translate(tr1.x(), tr1.y()); + bounds = t.mapRect(bounds); + } + qCDebug(qLcPdf) << Q_FUNC_INFO << m_page << finalSize; + if (image->size() != finalSize || !image->reinterpretAsFormat(QImage::Format_ARGB32_Premultiplied)) { + *image = QImage(finalSize, QImage::Format_ARGB32_Premultiplied); + if (!finalSize.isEmpty() && image->isNull()) { + // avoid QTBUG-68229 + qWarning("QPdfIOHandler: QImage allocation failed (size %i x %i)", finalSize.width(), finalSize.height()); + return false; + } + } + if (!finalSize.isEmpty()) { + QPdfDocumentRenderOptions options; + if (m_scaledClipRect.isValid()) + options.setScaledClipRect(m_scaledClipRect); + options.setScaledSize(pageSize); + image->fill(m_backColor.rgba()); + QPainter p(image); + QImage pageImage = m_doc.render(m_page, finalSize, options); + p.drawImage(0, 0, pageImage); + p.end(); + } + return true; + } + + return false; +} + +QVariant QPdfIOHandler::option(ImageOption option) const +{ + switch (option) { + case ImageFormat: + return QImage::Format_ARGB32_Premultiplied; + case Size: + const_cast<QPdfIOHandler *>(this)->load(device()); + return m_doc.pageSize(qMax(0, m_page)); + case ClipRect: + return m_clipRect; + case ScaledSize: + return m_scaledSize; + case ScaledClipRect: + return m_scaledClipRect; + case BackgroundColor: + return m_backColor; + case Name: + return m_doc.metaData(QPdfDocument::Title); + default: + break; + } + return QVariant(); +} + +void QPdfIOHandler::setOption(ImageOption option, const QVariant & value) +{ + switch (option) { + case ClipRect: + m_clipRect = value.toRect(); + break; + case ScaledSize: + m_scaledSize = value.toSize(); + break; + case ScaledClipRect: + m_scaledClipRect = value.toRect(); + break; + case BackgroundColor: + m_backColor = value.value<QColor>(); + break; + default: + break; + } +} + +bool QPdfIOHandler::supportsOption(ImageOption option) const +{ + switch (option) + { + case ImageFormat: + case Size: + case ClipRect: + case ScaledSize: + case ScaledClipRect: + case BackgroundColor: + case Name: + return true; + default: + break; + } + return false; +} + +bool QPdfIOHandler::jumpToImage(int frame) +{ + qCDebug(qLcPdf) << Q_FUNC_INFO << frame; + if (frame < 0 || frame >= imageCount()) + return false; + m_page = frame; + return true; +} + +bool QPdfIOHandler::jumpToNextImage() +{ + return jumpToImage(m_page + 1); +} + +bool QPdfIOHandler::load(QIODevice *device) +{ + if (m_loaded) + return true; + if (format().isEmpty()) + if (!canRead()) + return false; + + m_doc.load(device); + m_loaded = (m_doc.error() == QPdfDocument::DocumentError::NoError); + + return m_loaded; +} + +QT_END_NAMESPACE |