pdfium: turn the PDFium class into an interface

This will allow a dummy implementation that only provides
PDFiumLibrary::get() and nothing else.

Change-Id: Ia63b3f0b7751e5c05716825f0854282e4007207e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111502
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

3 files changed, 35 insertions, 20 deletions

diff --git a/include/vcl/filter/PDFiumLibrary.hxx b/include/vcl/filter/PDFiumLibrary.hxx
index 5bd7e57eec5f..9d2be861b520 100644
--- a/include/vcl/filter/PDFiumLibrary.hxx
+++ b/include/vcl/filter/PDFiumLibrary.hxx
@@ -49,23 +49,16 @@ class PDFiumBitmap;
 class PDFiumDocument;
 class PDFiumPageObject;
 
-class VCL_DLLPUBLIC PDFium final
+class VCL_DLLPUBLIC PDFium
 {
-private:
-    PDFium(const PDFium&) = delete;
-    PDFium& operator=(const PDFium&) = delete;
-
-    OUString maLastError;
-
 public:
-    PDFium();
-    ~PDFium();
+    virtual ~PDFium() = default;
 
-    const OUString& getLastError() const { return maLastError; }
+    virtual const OUString& getLastError() const = 0;
 
-    std::unique_ptr<PDFiumDocument> openDocument(const void* pData, int nSize);
-    static PDFErrorType getLastErrorCode();
-    std::unique_ptr<PDFiumBitmap> createBitmap(int nWidth, int nHeight, int nAlpha);
+    virtual std::unique_ptr<PDFiumDocument> openDocument(const void* pData, int nSize) = 0;
+    virtual PDFErrorType getLastErrorCode() = 0;
+    virtual std::unique_ptr<PDFiumBitmap> createBitmap(int nWidth, int nHeight, int nAlpha) = 0;
 };
 
 class PDFiumPage;
diff --git a/vcl/source/graphic/VectorGraphicSearch.cxx b/vcl/source/graphic/VectorGraphicSearch.cxx
index a32d7d93e5ed..14e67e0b7138 100644
--- a/vcl/source/graphic/VectorGraphicSearch.cxx
+++ b/vcl/source/graphic/VectorGraphicSearch.cxx
@@ -233,7 +233,7 @@ bool VectorGraphicSearch::searchPDF(std::shared_ptr<VectorGraphicData> const& rD
     if (!mpImplementation->mpPdfDocument)
     {
         //TODO: Handle failure to load.
-        switch (vcl::pdf::PDFium::getLastErrorCode())
+        switch (mpImplementation->mpPDFium->getLastErrorCode())
         {
             case vcl::pdf::PDFErrorType::Success:
                 break;
diff --git a/vcl/source/pdf/PDFiumLibrary.cxx b/vcl/source/pdf/PDFiumLibrary.cxx
index 617ea16cb6eb..cb91edf99ebc 100644
--- a/vcl/source/pdf/PDFiumLibrary.cxx
+++ b/vcl/source/pdf/PDFiumLibrary.cxx
@@ -394,6 +394,25 @@ public:
     std::unique_ptr<PDFiumSignature> getSignature(int nIndex) override;
     std::vector<unsigned int> getTrailerEnds() override;
 };
+
+class PDFiumImpl : public PDFium
+{
+private:
+    PDFiumImpl(const PDFiumImpl&) = delete;
+    PDFiumImpl& operator=(const PDFiumImpl&) = delete;
+
+    OUString maLastError;
+
+public:
+    PDFiumImpl();
+    ~PDFiumImpl() override;
+
+    const OUString& getLastError() const override { return maLastError; }
+
+    std::unique_ptr<PDFiumDocument> openDocument(const void* pData, int nSize) override;
+    PDFErrorType getLastErrorCode() override;
+    std::unique_ptr<PDFiumBitmap> createBitmap(int nWidth, int nHeight, int nAlpha) override;
+};
 }
 
 OUString convertPdfDateToISO8601(OUString const& rInput)
@@ -453,7 +472,7 @@ OUString convertPdfDateToISO8601(OUString const& rInput)
            + sTimeZoneString;
 }
 
-PDFium::PDFium()
+PDFiumImpl::PDFiumImpl()
 {
     FPDF_LIBRARY_CONFIG aConfig;
     aConfig.version = 2;
@@ -463,9 +482,9 @@ PDFium::PDFium()
     FPDF_InitLibraryWithConfig(&aConfig);
 }
 
-PDFium::~PDFium() { FPDF_DestroyLibrary(); }
+PDFiumImpl::~PDFiumImpl() { FPDF_DestroyLibrary(); }
 
-std::unique_ptr<PDFiumDocument> PDFium::openDocument(const void* pData, int nSize)
+std::unique_ptr<PDFiumDocument> PDFiumImpl::openDocument(const void* pData, int nSize)
 {
     maLastError = OUString();
     std::unique_ptr<PDFiumDocument> pPDFiumDocument;
@@ -509,9 +528,12 @@ std::unique_ptr<PDFiumDocument> PDFium::openDocument(const void* pData, int nSiz
     return pPDFiumDocument;
 }
 
-PDFErrorType PDFium::getLastErrorCode() { return static_cast<PDFErrorType>(FPDF_GetLastError()); }
+PDFErrorType PDFiumImpl::getLastErrorCode()
+{
+    return static_cast<PDFErrorType>(FPDF_GetLastError());
+}
 
-std::unique_ptr<PDFiumBitmap> PDFium::createBitmap(int nWidth, int nHeight, int nAlpha)
+std::unique_ptr<PDFiumBitmap> PDFiumImpl::createBitmap(int nWidth, int nHeight, int nAlpha)
 {
     std::unique_ptr<PDFiumBitmap> pPDFiumBitmap;
     FPDF_BITMAP pPdfBitmap = FPDFBitmap_Create(nWidth, nHeight, nAlpha);
@@ -1309,7 +1331,7 @@ int PDFiumSearchHandleImpl::getSearchCount() { return FPDFText_GetSchCount(mpSea
 
 std::shared_ptr<PDFium>& PDFiumLibrary::get()
 {
-    static auto pInstance = std::make_shared<PDFium>();
+    static std::shared_ptr<PDFium> pInstance = std::make_shared<PDFiumImpl>();
     return pInstance;
 }