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diff --git a/core/fpdfapi/page/ipdf_page.h b/core/fpdfapi/page/ipdf_page.h
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+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FPDFAPI_PAGE_IPDF_PAGE_H_
+#define CORE_FPDFAPI_PAGE_IPDF_PAGE_H_
+
+#include "core/fxcrt/fx_coordinates.h"
+#include "core/fxcrt/retain_ptr.h"
+#include "third_party/base/optional.h"
+
+class CPDF_Document;
+class CPDF_Page;
+
+// Small layering violation, incomplete type and always null if non-XFA.
+class CPDFXFA_Page;
+
+// Interface implemented by both page types (CPDF_Page and CPDFXFA_Page).
+class IPDF_Page : public Retainable {
+ public:
+ virtual CPDF_Page* AsPDFPage() = 0;
+ virtual CPDFXFA_Page* AsXFAPage() = 0;
+
+ virtual CPDF_Document* GetDocument() const = 0;
+
+ virtual float GetPageWidth() const = 0;
+ virtual float GetPageHeight() const = 0;
+ virtual CFX_Matrix GetDisplayMatrix(const FX_RECT& rect,
+ int iRotate) const = 0;
+
+ virtual Optional<CFX_PointF> DeviceToPage(
+ const FX_RECT& rect,
+ int rotate,
+ const CFX_PointF& device_point) const = 0;
+
+ virtual Optional<CFX_PointF> PageToDevice(
+ const FX_RECT& rect,
+ int rotate,
+ const CFX_PointF& page_point) const = 0;
+};
+
+inline CPDF_Page* ToPDFPage(IPDF_Page* pBase) {
+ return pBase ? pBase->AsPDFPage() : nullptr;
+}
+
+inline CPDFXFA_Page* ToXFAPage(IPDF_Page* pBase) {
+ return pBase ? pBase->AsXFAPage() : nullptr;
+}
+
+#endif // CORE_FPDFAPI_PAGE_IPDF_PAGE_H_