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#include "qpdfdocument.h"
#include "qpdfdocument_p.h"
#include <QFile>
#include <QIODevice>
#include <QMutex>
// The library is not thread-safe at all, it has a lot of global variables.
Q_GLOBAL_STATIC_WITH_ARGS(QMutex, pdfMutex, (QMutex::Recursive));
static int libraryRefCount;
QPdfDocumentPrivate::QPdfDocumentPrivate()
: doc(0)
{
QMutexLocker lock(pdfMutex());
if (libraryRefCount == 0)
FPDF_InitLibrary();
++libraryRefCount;
// FPDF_FILEACCESS setup
m_Param = this;
m_GetBlock = fpdf_GetBlock;
}
QPdfDocumentPrivate::~QPdfDocumentPrivate()
{
QMutexLocker lock(pdfMutex());
if (doc)
FPDF_CloseDocument(doc);
doc = 0;
if (!--libraryRefCount)
FPDF_DestroyLibrary();
}
QPdfDocument::Error QPdfDocumentPrivate::load(QIODevice *newDevice, bool transferDeviceOwnership, const QString &documentPassword)
{
QMutexLocker lock(pdfMutex());
if (doc)
FPDF_CloseDocument(doc);
if (transferDeviceOwnership)
ownDevice.reset(newDevice);
else
ownDevice.reset();
device = newDevice;
if (!device->isOpen() && !device->open(QIODevice::ReadOnly))
return QPdfDocument::FileNotFoundError;
// FPDF_FILEACCESS setup
m_FileLen = device->size();
password = documentPassword.toUtf8();
doc = FPDF_LoadCustomDocument(this, password.constData());
switch (FPDF_GetLastError()) {
case FPDF_ERR_SUCCESS: return QPdfDocument::NoError;
case FPDF_ERR_UNKNOWN: return QPdfDocument::UnknownError;
case FPDF_ERR_FILE: return QPdfDocument::FileNotFoundError;
case FPDF_ERR_FORMAT: return QPdfDocument::InvalidFileFormatError;
case FPDF_ERR_PASSWORD: return QPdfDocument::IncorrectPasswordError;
case FPDF_ERR_SECURITY: return QPdfDocument::UnsupportedSecuritySchemeError;
default:
Q_UNREACHABLE();
}
return QPdfDocument::UnknownError;
}
int QPdfDocumentPrivate::fpdf_GetBlock(void *param, unsigned long position, unsigned char *pBuf, unsigned long size)
{
QPdfDocumentPrivate *d = static_cast<QPdfDocumentPrivate*>(reinterpret_cast<FPDF_FILEACCESS*>(param));
d->device->seek(position);
return qMax(qint64(0), d->device->read(reinterpret_cast<char *>(pBuf), size));
}
QPdfDocument::QPdfDocument(QObject *parent)
: QObject(parent)
, d(new QPdfDocumentPrivate)
{
}
QPdfDocument::~QPdfDocument()
{
}
QPdfDocument::Error QPdfDocument::load(const QString &fileName, const QString &password)
{
return d->load(new QFile(fileName), /*transfer ownership*/true, password);
}
QPdfDocument::Error QPdfDocument::load(QIODevice *device, const QString &password)
{
return d->load(device, /*transfer ownership*/false, password);
}
int QPdfDocument::pageCount() const
{
if (!d->doc)
return 0;
QMutexLocker lock(pdfMutex());
return FPDF_GetPageCount(d->doc);
}
QSizeF QPdfDocument::pageSize(int page) const
{
QSizeF result;
if (!d->doc)
return result;
QMutexLocker lock(pdfMutex());
FPDF_GetPageSizeByIndex(d->doc, page, &result.rwidth(), &result.rheight());
return result;
}
QImage QPdfDocument::render(int page, const QSizeF &pageSize)
{
if (!d->doc)
return QImage();
QMutexLocker lock(pdfMutex());
FPDF_PAGE pdfPage = FPDF_LoadPage(d->doc, page);
if (!pdfPage)
return QImage();
QImage result(pageSize.toSize(), QImage::Format_ARGB32);
result.fill(Qt::transparent);
FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(result.width(), result.height(), FPDFBitmap_BGRA, result.bits(), result.bytesPerLine());
FPDF_RenderPageBitmap(bitmap, pdfPage, 0, 0, result.width(), result.height(), 0, 0);
FPDFBitmap_Destroy(bitmap);
return result;
}
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