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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
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@ -22,18 +22,30 @@ int pdfRead(void* param,
return 0; 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() PdfiumComic::PdfiumComic()
{ {
FPDF_InitLibrary(); QMutexLocker locker(&pdfmutex);
if (++refcount == 1) {
FPDF_InitLibrary();
}
} }
PdfiumComic::~PdfiumComic() PdfiumComic::~PdfiumComic()
{ {
QMutexLocker locker(&pdfmutex);
if (doc) if (doc)
{ {
FPDF_CloseDocument(doc); FPDF_CloseDocument(doc);
} }
FPDF_DestroyLibrary(); if (--refcount == 0) {
FPDF_DestroyLibrary();
}
} }
bool PdfiumComic::openComic(const QString & path) bool PdfiumComic::openComic(const QString & path)
@ -50,6 +62,7 @@ bool PdfiumComic::openComic(const QString & path)
fileAccess.m_GetBlock = pdfRead; fileAccess.m_GetBlock = pdfRead;
fileAccess.m_Param = &pdfFile; fileAccess.m_Param = &pdfFile;
QMutexLocker lock(&pdfmutex);
doc = FPDF_LoadCustomDocument(&fileAccess, NULL); doc = FPDF_LoadCustomDocument(&fileAccess, NULL);
if (doc) if (doc)
{ {
@ -64,13 +77,15 @@ bool PdfiumComic::openComic(const QString & path)
void PdfiumComic::closeComic() void PdfiumComic::closeComic()
{ {
FPDF_CloseDocument(doc); QMutexLocker locker(&pdfmutex);
FPDF_CloseDocument(doc);
} }
unsigned int PdfiumComic::numPages() unsigned int PdfiumComic::numPages()
{ {
if (doc) if (doc)
{ {
QMutexLocker locker(&pdfmutex);
return FPDF_GetPageCount(doc); return FPDF_GetPageCount(doc);
} }
else else
@ -90,26 +105,31 @@ QImage PdfiumComic::getPage(const int page)
FPDF_PAGE pdfpage; FPDF_PAGE pdfpage;
FPDF_BITMAP bitmap; FPDF_BITMAP bitmap;
QMutexLocker locker(&pdfmutex);
pdfpage = FPDF_LoadPage(doc, page); pdfpage = FPDF_LoadPage(doc, page);
if (!pdfpage) if (!pdfpage)
{ {
// TODO report error
qDebug() << FPDF_GetLastError();
return QImage(); return QImage();
} }
//TODO: make target DPI configurable // TODO: make target DPI configurable
double width = (FPDF_GetPageWidth(pdfpage)/72)*150; double width = (FPDF_GetPageWidth(pdfpage)/72)*150;
double height = (FPDF_GetPageHeight(pdfpage)/72)*150; double height = (FPDF_GetPageHeight(pdfpage)/72)*150;
image = QImage(width, height, QImage::Format_ARGB32);// QImage::Format_RGBX8888); image = QImage(width, height, QImage::Format_ARGB32);// QImage::Format_RGBX8888);
if (image.isNull()) if (image.isNull())
{ {
// TODO report OOM error
qDebug() << "Image too large, OOM";
return image; return image;
} }
image.fill(0xFFFFFFFF); image.fill(0xFFFFFFFF);
bitmap = FPDFBitmap_CreateEx(image.width(), image.height(), FPDFBitmap_BGRA, image.scanLine(0), image.bytesPerLine()); 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)); FPDF_RenderPageBitmap(bitmap, pdfpage, 0,0, image.width(), image.height(), 0, (FPDF_LCD_TEXT));
FPDFBitmap_Destroy(bitmap); FPDFBitmap_Destroy(bitmap);
FPDF_ClosePage(pdfpage); FPDF_ClosePage(pdfpage);

7
common/pdf_comic.h
View File

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