pdfium: only init pdfium library once and destroy on LO exit

With more and more usage of PDFium, it is hard to keep track of
the life-time of the PDFium library, so it can happen that a
FPDF_DestroyLibrary happens when we still have another instance
where PDFium is still use. The result of this is a crash. To
prevent this, just initialize the library once and delete, when
on LO exit.

This can be improved in the future to only keep the library
active when in actual use.

[ Leaving out the vector graphic search bits, the motivation is to just
have this in libreoffice-7-0, so that recent pdf sig verify improvements
can be backported. ]

(cherry picked from commit 067a8a954c8e1d8d6465a4ab5fb61e93f16c26c2)

Conflicts:
vcl/source/graphic/VectorGraphicSearch.cxx

Change-Id: I5c7e5de7f8b97d10efb394c67c7a61b976c8d57c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/102317
Tested-by: Miklos Vajna <vmiklos@collabora.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
(cherry picked from commit b7de766b4dc5b4810277069bcf53a9f3737e87da)

Conflicts:
svx/source/svdraw/svdpdf.cxx
svx/source/svdraw/svdpdf.hxx
vcl/Library_vcl.mk
vcl/qa/cppunit/pdfexport/pdfexport.cxx
vcl/source/filter/ipdf/pdfread.cxx

1 files changed, 4 insertions, 14 deletions

diff --git a/vcl/source/filter/ipdf/pdfread.cxx b/vcl/source/filter/ipdf/pdfread.cxx
index e3fe26332e2f..ec4d068ac007 100644
--- a/vcl/source/filter/ipdf/pdfread.cxx
+++ b/vcl/source/filter/ipdf/pdfread.cxx
@@ -20,6 +20,8 @@
 #include <vcl/graph.hxx>
 #include <bitmapwriteaccess.hxx>
 
+#include <vcl/filter/PDFiumLibrary.hxx>
+
 using namespace com::sun::star;
 
 namespace
@@ -58,12 +60,7 @@ double pointToPixel(double fPoint) { return fPoint / 72 * 96; }
 size_t generatePreview(SvStream& rStream, std::vector<Bitmap>& rBitmaps, sal_uInt64 nPos,
                        sal_uInt64 nSize, const size_t nFirstPage, int nPages)
 {
-    FPDF_LIBRARY_CONFIG aConfig;
-    aConfig.version = 2;
-    aConfig.m_pUserFontPaths = nullptr;
-    aConfig.m_pIsolate = nullptr;
-    aConfig.m_v8EmbedderSlot = 0;
-    FPDF_InitLibraryWithConfig(&aConfig);
+    auto pPdfium = vcl::pdf::PDFiumLibrary::get();
 
     // Read input into a buffer.
     SvMemoryStream aInBuffer;
@@ -119,7 +116,6 @@ size_t generatePreview(SvStream& rStream, std::vector<Bitmap>& rBitmaps, sal_uIn
     }
 
     FPDF_CloseDocument(pPdfDocument);
-    FPDF_DestroyLibrary();
 
     return rBitmaps.size();
 }
@@ -159,12 +155,7 @@ bool getCompatibleStream(SvStream& rInStream, SvStream& rOutStream, sal_uInt64 n
     else
     {
         // Downconvert to PDF-1.5.
-        FPDF_LIBRARY_CONFIG aConfig;
-        aConfig.version = 2;
-        aConfig.m_pUserFontPaths = nullptr;
-        aConfig.m_pIsolate = nullptr;
-        aConfig.m_v8EmbedderSlot = 0;
-        FPDF_InitLibraryWithConfig(&aConfig);
+        auto pPdfium = vcl::pdf::PDFiumLibrary::get();
 
         // Read input into a buffer.
         SvMemoryStream aInBuffer;
@@ -182,7 +173,6 @@ bool getCompatibleStream(SvStream& rInStream, SvStream& rOutStream, sal_uInt64 n
             return false;
 
         FPDF_CloseDocument(pPdfDocument);
-        FPDF_DestroyLibrary();
 
         aWriter.m_aStream.Seek(STREAM_SEEK_TO_BEGIN);
         rOutStream.WriteStream(aWriter.m_aStream);