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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.
#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 {
// There are actually 3 cases: a PDF page, an XFA page backed by a PDF page,
// and an XFA page not backed by a PDF page. AsPDFPage() will return the
// PDF page in either of the first two cases. AsXFAPage() is a straight
// downcast and is null if not either of the last two cases. Hence, both
// of these may return non-null on a given page.
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;