diff options
Diffstat (limited to 'src/core/pdfium_document_wrapper_qt.cpp')
| -rw-r--r-- | src/core/pdfium_document_wrapper_qt.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/core/pdfium_document_wrapper_qt.cpp b/src/core/pdfium_document_wrapper_qt.cpp new file mode 100644 index 000000000..7c43c77db --- /dev/null +++ b/src/core/pdfium_document_wrapper_qt.cpp @@ -0,0 +1,172 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtWebEngine module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 https://www.qt.io/terms-conditions. For further +** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ +#if defined (ENABLE_PDF) +#include "pdfium_document_wrapper_qt.h" + +#include <QtCore/qhash.h> +#include <QtGui/qimage.h> +#include <QtGui/qpainter.h> + +#include "third_party/pdfium/public/fpdf_doc.h" +#include "third_party/pdfium/public/fpdfview.h" + +namespace QtWebEngineCore { +int PdfiumDocumentWrapperQt::m_libraryUsers = 0; + +class QWEBENGINE_EXPORT PdfiumPageWrapperQt { +public: + PdfiumPageWrapperQt(void *data, int pageIndex, int targetWidth, int targetHeight) + : m_pageData(FPDF_LoadPage(data, pageIndex)) + , m_width(FPDF_GetPageWidth(m_pageData)) + , m_height(FPDF_GetPageHeight(m_pageData)) + , m_index(pageIndex) + , m_image(createImage(targetWidth, targetHeight)) + { + } + + PdfiumPageWrapperQt() + : m_pageData(nullptr) + , m_width(-1) + , m_height(-1) + , m_index(-1) + , m_image(QImage()) + { + } + + virtual ~PdfiumPageWrapperQt() + { + FPDF_ClosePage(m_pageData); + } + + QImage image() + { + return m_image; + } + +private: + QImage createImage(int targetWidth, int targetHeight) + { + Q_ASSERT(m_pageData); + if (targetWidth <= 0) + targetWidth = m_width; + + if (targetHeight <= 0) + targetHeight = m_height; + + QImage image(targetWidth, targetHeight, QImage::Format_RGBA8888); + Q_ASSERT(!image.isNull()); + image.fill(0xFFFFFFFF); + + FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(image.width(), image.height(), + FPDFBitmap_BGRA, + image.scanLine(0), image.bytesPerLine()); + Q_ASSERT(bitmap); + + FPDF_RenderPageBitmap(bitmap, m_pageData, + 0, 0, image.width(), image.height(), + 0, 0); + FPDFBitmap_Destroy(bitmap); + bitmap = nullptr; + + // Map BGRA to RGBA as PDFium currently does not support RGBA bitmaps directly + for (int i = 0; i < image.height(); i++) { + uchar *pixels = image.scanLine(i); + for (int j = 0; j < image.width(); j++) { + qSwap(pixels[0], pixels[2]); + pixels += 4; + } + } + return image; + } + +private: + void *m_pageData; + int m_width; + int m_height; + int m_index; + QImage m_image; +}; + + +PdfiumDocumentWrapperQt::PdfiumDocumentWrapperQt(const void *pdfData, size_t size, const QSize& imageSize, const char *password) + : m_imageSize(imageSize * 2.0) +{ + Q_ASSERT(pdfData); + Q_ASSERT(size); + if (m_libraryUsers++ == 0) + FPDF_InitLibrary(); + + m_documentHandle = FPDF_LoadMemDocument(pdfData, static_cast<int>(size), password); + m_pageCount = FPDF_GetPageCount(m_documentHandle); +} + +QImage PdfiumDocumentWrapperQt::pageAsQImage(size_t index) +{ + if (!m_documentHandle || !m_pageCount) { + qWarning("Failure to generate QImage from invalid or empty PDF document."); + return QImage(); + } + + if (static_cast<int>(index) >= m_pageCount) { + qWarning("Failure to generate QImage from PDF data: index out of bounds."); + return QImage(); + } + + PdfiumPageWrapperQt *pageWrapper = nullptr; + if (!m_cachedPages.contains(index)) { + pageWrapper = new PdfiumPageWrapperQt(m_documentHandle, index, + m_imageSize.width(), m_imageSize.height()); + m_cachedPages.insert(index, pageWrapper); + } else { + pageWrapper = m_cachedPages.value(index); + } + + return pageWrapper->image(); +} + +PdfiumDocumentWrapperQt::~PdfiumDocumentWrapperQt() +{ + qDeleteAll(m_cachedPages); + FPDF_CloseDocument(m_documentHandle); + if (--m_libraryUsers == 0) + FPDF_DestroyLibrary(); +} + +} +#endif // defined (ENABLE_PDF) |