Make common page base class for XFA and non-XFA.

Now that both are ref-counted, we can replace ifdef's with some
polymorphism.

Bug: pdfium:760

Change-Id: Ie22ea259c9af56fa569f0af268b8e7065789a3f2
Reviewed-on: https://pdfium-review.googlesource.com/32892
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

2 files changed, 30 insertions, 13 deletions

diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_page.cpp b/fpdfsdk/fpdfxfa/cpdfxfa_page.cpp
index f4120896a8..ad0615528f 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_page.cpp
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_page.cpp
@@ -22,6 +22,18 @@ CPDFXFA_Page::CPDFXFA_Page(CPDFXFA_Context* pContext, int page_index)
 
 CPDFXFA_Page::~CPDFXFA_Page() {}
 
+CPDF_Page* CPDFXFA_Page::AsPDFPage() {
+  return m_pPDFPage.Get();
+}
+
+CPDFXFA_Page* CPDFXFA_Page::AsXFAPage() {
+  return this;
+}
+
+CPDF_Document* CPDFXFA_Page::GetDocument() const {
+  return GetDocumentExtension()->GetPDFDoc();
+}
+
 bool CPDFXFA_Page::LoadPDFPage() {
   if (!m_pContext)
     return false;
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_page.h b/fpdfsdk/fpdfxfa/cpdfxfa_page.h
index 2573b9cebd..76c425f82b 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_page.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_page.h
@@ -10,6 +10,7 @@
 #include <memory>
 
 #include "core/fpdfapi/page/cpdf_page.h"
+#include "core/fpdfapi/page/ipdf_page.h"
 #include "core/fpdfapi/parser/cpdf_document.h"
 #include "core/fxcrt/fx_coordinates.h"
 #include "core/fxcrt/fx_system.h"
@@ -21,35 +22,39 @@ class CPDF_Dictionary;
 class CPDFXFA_Context;
 class CXFA_FFPageView;
 
-class CPDFXFA_Page : public CPDF_Page::Extension {
+class CPDFXFA_Page : public IPDF_Page {
  public:
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
 
+  // IPDF_Page:
+  CPDF_Page* AsPDFPage() override;
+  CPDFXFA_Page* AsXFAPage() override;
+  CPDF_Document* GetDocument() const override;
+  float GetPageWidth() const override;
+  float GetPageHeight() const override;
+  CFX_Matrix GetDisplayMatrix(const FX_RECT& rect, int iRotate) const override;
+  Optional<CFX_PointF> DeviceToPage(
+      const FX_RECT& rect,
+      int rotate,
+      const CFX_PointF& device_point) const override;
+  Optional<CFX_PointF> PageToDevice(
+      const FX_RECT& rect,
+      int rotate,
+      const CFX_PointF& page_point) const override;
+
   bool LoadPage();
   bool LoadPDFPage(CPDF_Dictionary* pageDict);
 
   CPDF_Document::Extension* GetDocumentExtension() const;
 
   int GetPageIndex() const { return m_iPageIndex; }
-  CPDF_Page* GetPDFPage() const { return m_pPDFPage.Get(); }
   CXFA_FFPageView* GetXFAPageView() const { return m_pXFAPageView; }
 
   void SetXFAPageView(CXFA_FFPageView* pPageView) {
     m_pXFAPageView = pPageView;
   }
 
-  float GetPageWidth() const;
-  float GetPageHeight() const;
-
-  Optional<CFX_PointF> DeviceToPage(const FX_RECT& rect,
-                                    int rotate,
-                                    const CFX_PointF& device_point) const;
-  Optional<CFX_PointF> PageToDevice(const FX_RECT& rect,
-                                    int rotate,
-                                    const CFX_PointF& page_point) const;
-
-  CFX_Matrix GetDisplayMatrix(const FX_RECT& rect, int iRotate) const;
 
  protected:
   // Refcounted class.