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Pdfium isn't threadsafe? Pdfium gets mutexed!

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This commit is contained in:
Felix Kauselmann
2018-01-08 14:39:26 +01:00
parent 760c1b3847
commit e935281b47
2 changed files with 30 additions and 7 deletions
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30
common/pdf_comic.cpp
View File

@ -22,18 +22,30 @@ int pdfRead(void* param,
return 0;
}
// pdfium is not threadsafe
// We need to use mutex locking & refcounting to avoid crashes
int PdfiumComic::refcount = 0;
QMutex PdfiumComic::pdfmutex;
PdfiumComic::PdfiumComic()
{
FPDF_InitLibrary();
QMutexLocker locker(&pdfmutex);
if (++refcount == 1) {
FPDF_InitLibrary();
}
}
PdfiumComic::~PdfiumComic()
{
QMutexLocker locker(&pdfmutex);
if (doc)
{
FPDF_CloseDocument(doc);
}
FPDF_DestroyLibrary();
if (--refcount == 0) {
FPDF_DestroyLibrary();
}
}
bool PdfiumComic::openComic(const QString & path)
@ -50,6 +62,7 @@ bool PdfiumComic::openComic(const QString & path)
fileAccess.m_GetBlock = pdfRead;
fileAccess.m_Param = &pdfFile;
QMutexLocker lock(&pdfmutex);
doc = FPDF_LoadCustomDocument(&fileAccess, NULL);
if (doc)
{
@ -64,13 +77,15 @@ bool PdfiumComic::openComic(const QString & path)
void PdfiumComic::closeComic()
{
FPDF_CloseDocument(doc);
QMutexLocker locker(&pdfmutex);
FPDF_CloseDocument(doc);
}
unsigned int PdfiumComic::numPages()
{
if (doc)
{
QMutexLocker locker(&pdfmutex);
return FPDF_GetPageCount(doc);
}
else
@ -90,26 +105,31 @@ QImage PdfiumComic::getPage(const int page)
FPDF_PAGE pdfpage;
FPDF_BITMAP bitmap;
QMutexLocker locker(&pdfmutex);
pdfpage = FPDF_LoadPage(doc, page);
if (!pdfpage)
{
// TODO report error
qDebug() << FPDF_GetLastError();
return QImage();
}
//TODO: make target DPI configurable
// TODO: make target DPI configurable
double width = (FPDF_GetPageWidth(pdfpage)/72)*150;
double height = (FPDF_GetPageHeight(pdfpage)/72)*150;
image = QImage(width, height, QImage::Format_ARGB32);// QImage::Format_RGBX8888);
if (image.isNull())
{
// TODO report OOM error
qDebug() << "Image too large, OOM";
return image;
}
image.fill(0xFFFFFFFF);
bitmap = FPDFBitmap_CreateEx(image.width(), image.height(), FPDFBitmap_BGRA, image.scanLine(0), image.bytesPerLine());
//TODO: make render flags costumizable
// TODO: make render flags costumizable
FPDF_RenderPageBitmap(bitmap, pdfpage, 0,0, image.width(), image.height(), 0, (FPDF_LCD_TEXT));
FPDFBitmap_Destroy(bitmap);
FPDF_ClosePage(pdfpage);

7
common/pdf_comic.h
View File

@ -4,6 +4,7 @@
#include <QObject>
#include <QImage>
#include <QFile>
#include <QMutex>
#if defined Q_OS_MAC && defined USE_PDFKIT
class MacOSXPDFComic
@ -16,7 +17,7 @@ class MacOSXPDFComic
unsigned int numPages();
QImage getPage(const int page);
//void releaseLastPageData();
private:
void * document;
void * lastPageData;
@ -34,8 +35,10 @@ class PdfiumComic
void closeComic();
unsigned int numPages();
QImage getPage(const int page);
private:
static int refcount;
static QMutex pdfmutex;
FPDF_LIBRARY_CONFIG config;
FPDF_DOCUMENT doc;
FPDF_FILEACCESS fileAccess;