1 files changed, 96 insertions, 0 deletions
diff --git a/vcl/source/pdf/PDFiumLibrary.cxx b/vcl/source/pdf/PDFiumLibrary.cxx
new file mode 100644
index 000000000..f481078ab
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+++ b/vcl/source/pdf/PDFiumLibrary.cxx
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#include <config_features.h>
+
+#if HAVE_FEATURE_PDFIUM
+
+#include <vcl/filter/PDFiumLibrary.hxx>
+#include <fpdf_doc.h>
+
+#include <vcl/bitmap.hxx>
+
+#include <bitmapwriteaccess.hxx>
+
+namespace vcl::pdf
+{
+PDFium::PDFium()
+{
+    FPDF_LIBRARY_CONFIG aConfig;
+    aConfig.version = 2;
+    aConfig.m_pUserFontPaths = nullptr;
+    aConfig.m_pIsolate = nullptr;
+    aConfig.m_v8EmbedderSlot = 0;
+    FPDF_InitLibraryWithConfig(&aConfig);
+}
+
+PDFium::~PDFium() { FPDF_DestroyLibrary(); }
+
+PDFiumDocument::PDFiumDocument(FPDF_DOCUMENT pPdfDocument)
+    : mpPdfDocument(pPdfDocument)
+{
+}
+
+PDFiumDocument::~PDFiumDocument()
+{
+    if (mpPdfDocument)
+        FPDF_CloseDocument(mpPdfDocument);
+}
+
+std::unique_ptr<PDFiumPage> PDFiumDocument::openPage(int nIndex)
+{
+    std::unique_ptr<PDFiumPage> pPDFiumPage;
+    FPDF_PAGE pPage = FPDF_LoadPage(mpPdfDocument, nIndex);
+    if (pPage)
+    {
+        pPDFiumPage = std::make_unique<PDFiumPage>(pPage);
+    }
+    return pPDFiumPage;
+}
+
+int PDFiumDocument::getPageCount() { return FPDF_GetPageCount(mpPdfDocument); }
+
+BitmapChecksum PDFiumPage::getChecksum(int nMDPPerm)
+{
+    size_t nPageWidth = FPDF_GetPageWidth(mpPage);
+    size_t nPageHeight = FPDF_GetPageHeight(mpPage);
+    FPDF_BITMAP pPdfBitmap = FPDFBitmap_Create(nPageWidth, nPageHeight, /*alpha=*/1);
+    if (!pPdfBitmap)
+    {
+        return 0;
+    }
+
+    int nFlags = 0;
+    if (nMDPPerm != 3)
+    {
+        // Annotations/commenting should affect the checksum, signature verification wants this.
+        nFlags = FPDF_ANNOT;
+    }
+    FPDF_RenderPageBitmap(pPdfBitmap, mpPage, /*start_x=*/0, /*start_y=*/0, nPageWidth, nPageHeight,
+                          /*rotate=*/0, nFlags);
+    Bitmap aBitmap(Size(nPageWidth, nPageHeight), 24);
+    {
+        BitmapScopedWriteAccess pWriteAccess(aBitmap);
+        const auto pPdfBuffer = static_cast<ConstScanline>(FPDFBitmap_GetBuffer(pPdfBitmap));
+        const int nStride = FPDFBitmap_GetStride(pPdfBitmap);
+        for (size_t nRow = 0; nRow < nPageHeight; ++nRow)
+        {
+            ConstScanline pPdfLine = pPdfBuffer + (nStride * nRow);
+            pWriteAccess->CopyScanline(nRow, pPdfLine, ScanlineFormat::N32BitTcBgra, nStride);
+        }
+    }
+    return aBitmap.GetChecksum();
+}
+
+} // end vcl::pdf
+
+#endif // HAVE_FEATURE_PDFIUM
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */