Rename fpdfsdk/fpdf* files to be consistent

This CL makes the fpdfsdk/fpdf* files to be consistently prefixed with
fpdf_ instead of randomly dropping the _.

Change-Id: I23e3c8a0831b56bcd17c788d9fe874b2ab8b24fc
Reviewed-on: https://pdfium-review.googlesource.com/29390
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>

1 files changed, 1159 insertions, 0 deletions

diff --git a/fpdfsdk/fpdf_view.cpp b/fpdfsdk/fpdf_view.cpp
new file mode 100644
index 0000000000..a0877f38b5
--- /dev/null
+++ b/fpdfsdk/fpdf_view.cpp
@@ -0,0 +1,1159 @@
+// Copyright 2014 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
+
+#include "public/fpdfview.h"
+
+#include <utility>
+#include <vector>
+
+#include "core/fpdfapi/cpdf_modulemgr.h"
+#include "core/fpdfapi/cpdf_pagerendercontext.h"
+#include "core/fpdfapi/page/cpdf_page.h"
+#include "core/fpdfapi/parser/cpdf_array.h"
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfapi/parser/cpdf_name.h"
+#include "core/fpdfapi/parser/cpdf_parser.h"
+#include "core/fpdfapi/parser/fpdf_parser_decode.h"
+#include "core/fpdfapi/render/cpdf_progressiverenderer.h"
+#include "core/fpdfapi/render/cpdf_rendercontext.h"
+#include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fpdfdoc/cpdf_annotlist.h"
+#include "core/fpdfdoc/cpdf_nametree.h"
+#include "core/fpdfdoc/cpdf_occontext.h"
+#include "core/fpdfdoc/cpdf_viewerpreferences.h"
+#include "core/fxcrt/fx_stream.h"
+#include "core/fxcrt/fx_system.h"
+#include "core/fxge/cfx_defaultrenderdevice.h"
+#include "core/fxge/cfx_gemodule.h"
+#include "core/fxge/cfx_renderdevice.h"
+#include "fpdfsdk/cpdfsdk_customaccess.h"
+#include "fpdfsdk/cpdfsdk_formfillenvironment.h"
+#include "fpdfsdk/cpdfsdk_helpers.h"
+#include "fpdfsdk/cpdfsdk_memoryaccess.h"
+#include "fpdfsdk/cpdfsdk_pageview.h"
+#include "fpdfsdk/ipdfsdk_pauseadapter.h"
+#include "fxjs/ijs_runtime.h"
+#include "public/fpdf_formfill.h"
+#include "third_party/base/ptr_util.h"
+
+#ifdef PDF_ENABLE_XFA
+#include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
+#include "fpdfsdk/fpdfxfa/cpdfxfa_page.h"
+#include "fxbarcode/BC_Library.h"
+#endif  // PDF_ENABLE_XFA
+
+#if _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
+#include "core/fxge/cfx_windowsrenderdevice.h"
+#include "public/fpdf_edit.h"
+
+// These checks are here because core/ and public/ cannot depend on each other.
+static_assert(WindowsPrintMode::kModeEmf == FPDF_PRINTMODE_EMF,
+              "WindowsPrintMode::kModeEmf value mismatch");
+static_assert(WindowsPrintMode::kModeTextOnly == FPDF_PRINTMODE_TEXTONLY,
+              "WindowsPrintMode::kModeTextOnly value mismatch");
+static_assert(WindowsPrintMode::kModePostScript2 == FPDF_PRINTMODE_POSTSCRIPT2,
+              "WindowsPrintMode::kModePostScript2 value mismatch");
+static_assert(WindowsPrintMode::kModePostScript3 == FPDF_PRINTMODE_POSTSCRIPT3,
+              "WindowsPrintMode::kModePostScript3 value mismatch");
+#endif
+
+namespace {
+
+bool g_bLibraryInitialized = false;
+
+void RenderPageImpl(CPDF_PageRenderContext* pContext,
+                    CPDF_Page* pPage,
+                    const CFX_Matrix& matrix,
+                    const FX_RECT& clipping_rect,
+                    int flags,
+                    bool bNeedToRestore,
+                    IPDFSDK_PauseAdapter* pause) {
+  if (!pContext->m_pOptions)
+    pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>();
+
+  uint32_t option_flags = pContext->m_pOptions->GetFlags();
+  if (flags & FPDF_LCD_TEXT)
+    option_flags |= RENDER_CLEARTYPE;
+  else
+    option_flags &= ~RENDER_CLEARTYPE;
+
+  if (flags & FPDF_NO_NATIVETEXT)
+    option_flags |= RENDER_NO_NATIVETEXT;
+  if (flags & FPDF_RENDER_LIMITEDIMAGECACHE)
+    option_flags |= RENDER_LIMITEDIMAGECACHE;
+  if (flags & FPDF_RENDER_FORCEHALFTONE)
+    option_flags |= RENDER_FORCE_HALFTONE;
+#ifndef PDF_ENABLE_XFA
+  if (flags & FPDF_RENDER_NO_SMOOTHTEXT)
+    option_flags |= RENDER_NOTEXTSMOOTH;
+  if (flags & FPDF_RENDER_NO_SMOOTHIMAGE)
+    option_flags |= RENDER_NOIMAGESMOOTH;
+  if (flags & FPDF_RENDER_NO_SMOOTHPATH)
+    option_flags |= RENDER_NOPATHSMOOTH;
+#endif  // PDF_ENABLE_XFA
+  pContext->m_pOptions->SetFlags(option_flags);
+
+  // Grayscale output
+  if (flags & FPDF_GRAYSCALE)
+    pContext->m_pOptions->SetColorMode(CPDF_RenderOptions::kGray);
+
+  const CPDF_OCContext::UsageType usage =
+      (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View;
+  pContext->m_pOptions->SetOCContext(
+      pdfium::MakeRetain<CPDF_OCContext>(pPage->m_pDocument.Get(), usage));
+
+  pContext->m_pDevice->SaveState();
+  pContext->m_pDevice->SetClip_Rect(clipping_rect);
+  pContext->m_pContext = pdfium::MakeUnique<CPDF_RenderContext>(pPage);
+  pContext->m_pContext->AppendLayer(pPage, &matrix);
+
+  if (flags & FPDF_ANNOT) {
+    pContext->m_pAnnots = pdfium::MakeUnique<CPDF_AnnotList>(pPage);
+    bool bPrinting = pContext->m_pDevice->GetDeviceClass() != FXDC_DISPLAY;
+    pContext->m_pAnnots->DisplayAnnots(pPage, pContext->m_pContext.get(),
+                                       bPrinting, &matrix, false, nullptr);
+  }
+
+  pContext->m_pRenderer = pdfium::MakeUnique<CPDF_ProgressiveRenderer>(
+      pContext->m_pContext.get(), pContext->m_pDevice.get(),
+      pContext->m_pOptions.get());
+  pContext->m_pRenderer->Start(pause);
+  if (bNeedToRestore)
+    pContext->m_pDevice->RestoreState(false);
+}
+
+FPDF_DOCUMENT LoadDocumentImpl(
+    const RetainPtr<IFX_SeekableReadStream>& pFileAccess,
+    FPDF_BYTESTRING password) {
+  if (!pFileAccess) {
+    ProcessParseError(CPDF_Parser::FILE_ERROR);
+    return nullptr;
+  }
+
+  auto pParser = pdfium::MakeUnique<CPDF_Parser>();
+  pParser->SetPassword(password);
+
+  auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser));
+  CPDF_Parser::Error error =
+      pDocument->GetParser()->StartParse(pFileAccess, pDocument.get());
+  if (error != CPDF_Parser::SUCCESS) {
+    ProcessParseError(error);
+    return nullptr;
+  }
+  CheckUnSupportError(pDocument.get(), error);
+  return FPDFDocumentFromCPDFDocument(pDocument.release());
+}
+
+}  // namespace
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_InitLibrary() {
+  FPDF_InitLibraryWithConfig(nullptr);
+}
+
+FPDF_EXPORT void FPDF_CALLCONV
+FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* cfg) {
+  if (g_bLibraryInitialized)
+    return;
+
+  FXMEM_InitializePartitionAlloc();
+
+  CFX_GEModule* pModule = CFX_GEModule::Get();
+  pModule->Init(cfg ? cfg->m_pUserFontPaths : nullptr);
+
+  CPDF_ModuleMgr* pModuleMgr = CPDF_ModuleMgr::Get();
+  pModuleMgr->Init();
+
+#ifdef PDF_ENABLE_XFA
+  BC_Library_Init();
+#endif  // PDF_ENABLE_XFA
+  if (cfg && cfg->version >= 2)
+    IJS_Runtime::Initialize(cfg->m_v8EmbedderSlot, cfg->m_pIsolate);
+
+  g_bLibraryInitialized = true;
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_DestroyLibrary() {
+  if (!g_bLibraryInitialized)
+    return;
+
+#ifdef PDF_ENABLE_XFA
+  BC_Library_Destroy();
+#endif  // PDF_ENABLE_XFA
+
+  CPDF_ModuleMgr::Destroy();
+  CFX_GEModule::Destroy();
+
+  IJS_Runtime::Destroy();
+
+  g_bLibraryInitialized = false;
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
+                                                     FPDF_BOOL enable) {
+  return FSDK_SetSandBoxPolicy(policy, enable);
+}
+
+#if defined(_WIN32)
+#if defined(PDFIUM_PRINT_TEXT_WITH_GDI)
+FPDF_EXPORT void FPDF_CALLCONV
+FPDF_SetTypefaceAccessibleFunc(PDFiumEnsureTypefaceCharactersAccessible func) {
+  g_pdfium_typeface_accessible_func = func;
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_SetPrintTextWithGDI(FPDF_BOOL use_gdi) {
+  g_pdfium_print_text_with_gdi = !!use_gdi;
+}
+#endif  // PDFIUM_PRINT_TEXT_WITH_GDI
+
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
+FPDF_SetPrintPostscriptLevel(int postscript_level) {
+  return postscript_level != 1 && FPDF_SetPrintMode(postscript_level);
+}
+
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_SetPrintMode(int mode) {
+  if (mode < FPDF_PRINTMODE_EMF || mode > FPDF_PRINTMODE_POSTSCRIPT3)
+    return FALSE;
+  g_pdfium_print_mode = mode;
+  return TRUE;
+}
+#endif  // defined(_WIN32)
+
+FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
+FPDF_LoadDocument(FPDF_STRING file_path, FPDF_BYTESTRING password) {
+  // NOTE: the creation of the file needs to be by the embedder on the
+  // other side of this API.
+  return LoadDocumentImpl(IFX_SeekableReadStream::CreateFromFilename(file_path),
+                          password);
+}
+
+FPDF_EXPORT int FPDF_CALLCONV FPDF_GetFormType(FPDF_DOCUMENT document) {
+  const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return FORMTYPE_NONE;
+
+  const CPDF_Dictionary* pRoot = pDoc->GetRoot();
+  if (!pRoot)
+    return FORMTYPE_NONE;
+
+  CPDF_Dictionary* pAcroForm = pRoot->GetDictFor("AcroForm");
+  if (!pAcroForm)
+    return FORMTYPE_NONE;
+
+  CPDF_Object* pXFA = pAcroForm->GetObjectFor("XFA");
+  if (!pXFA)
+    return FORMTYPE_ACRO_FORM;
+
+  bool bNeedsRendering = pRoot->GetBooleanFor("NeedsRendering", false);
+  return bNeedsRendering ? FORMTYPE_XFA_FULL : FORMTYPE_XFA_FOREGROUND;
+}
+
+#ifdef PDF_ENABLE_XFA
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_LoadXFA(FPDF_DOCUMENT document) {
+  return document && static_cast<CPDFXFA_Context*>(document)->LoadXFADoc();
+}
+#endif  // PDF_ENABLE_XFA
+
+FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
+FPDF_LoadMemDocument(const void* data_buf, int size, FPDF_BYTESTRING password) {
+  return LoadDocumentImpl(pdfium::MakeRetain<CPDFSDK_MemoryAccess>(
+                              static_cast<const uint8_t*>(data_buf), size),
+                          password);
+}
+
+FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
+FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess,
+                        FPDF_BYTESTRING password) {
+  return LoadDocumentImpl(pdfium::MakeRetain<CPDFSDK_CustomAccess>(pFileAccess),
+                          password);
+}
+
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_GetFileVersion(FPDF_DOCUMENT doc,
+                                                        int* fileVersion) {
+  if (!fileVersion)
+    return false;
+
+  *fileVersion = 0;
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc);
+  if (!pDoc)
+    return false;
+
+  const CPDF_Parser* pParser = pDoc->GetParser();
+  if (!pParser)
+    return false;
+
+  *fileVersion = pParser->GetFileVersion();
+  return true;
+}
+
+// jabdelmalek: changed return type from uint32_t to build on Linux (and match
+// header).
+FPDF_EXPORT unsigned long FPDF_CALLCONV
+FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  // https://bugs.chromium.org/p/pdfium/issues/detail?id=499
+  if (!pDoc) {
+#ifndef PDF_ENABLE_XFA
+    return 0;
+#else   // PDF_ENABLE_XFA
+    return 0xFFFFFFFF;
+#endif  // PDF_ENABLE_XFA
+  }
+
+  return pDoc->GetUserPermissions();
+}
+
+FPDF_EXPORT int FPDF_CALLCONV
+FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc || !pDoc->GetParser())
+    return -1;
+
+  CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
+  return pDict ? pDict->GetIntegerFor("R") : -1;
+}
+
+FPDF_EXPORT int FPDF_CALLCONV FPDF_GetPageCount(FPDF_DOCUMENT document) {
+  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
+  return pDoc ? pDoc->GetPageCount() : 0;
+}
+
+FPDF_EXPORT FPDF_PAGE FPDF_CALLCONV FPDF_LoadPage(FPDF_DOCUMENT document,
+                                                  int page_index) {
+  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
+
+  if (page_index < 0 || page_index >= pDoc->GetPageCount())
+    return nullptr;
+
+#ifdef PDF_ENABLE_XFA
+  return pDoc->GetXFAPage(page_index).Leak();
+#else   // PDF_ENABLE_XFA
+  CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
+  if (!pDict)
+    return nullptr;
+
+  CPDF_Page* pPage = new CPDF_Page(pDoc, pDict, true);
+  pPage->ParseContent();
+  return pPage;
+#endif  // PDF_ENABLE_XFA
+}
+
+FPDF_EXPORT double FPDF_CALLCONV FPDF_GetPageWidth(FPDF_PAGE page) {
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+  return pPage ? pPage->GetPageWidth() : 0.0;
+}
+
+FPDF_EXPORT double FPDF_CALLCONV FPDF_GetPageHeight(FPDF_PAGE page) {
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+  return pPage ? pPage->GetPageHeight() : 0.0;
+}
+
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_GetPageBoundingBox(FPDF_PAGE page,
+                                                            FS_RECTF* rect) {
+  if (!rect)
+    return false;
+
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return false;
+
+  FSRECTFFromCFXFloatRect(pPage->GetPageBBox(), rect);
+  return true;
+}
+
+#if defined(_WIN32)
+namespace {
+
+const double kEpsilonSize = 0.01f;
+
+void GetScaling(CPDF_Page* pPage,
+                int size_x,
+                int size_y,
+                int rotate,
+                double* scale_x,
+                double* scale_y) {
+  ASSERT(pPage);
+  ASSERT(scale_x);
+  ASSERT(scale_y);
+  double page_width = pPage->GetPageWidth();
+  double page_height = pPage->GetPageHeight();
+  if (page_width < kEpsilonSize || page_height < kEpsilonSize)
+    return;
+
+  if (rotate % 2 == 0) {
+    *scale_x = size_x / page_width;
+    *scale_y = size_y / page_height;
+  } else {
+    *scale_x = size_y / page_width;
+    *scale_y = size_x / page_height;
+  }
+}
+
+FX_RECT GetMaskDimensionsAndOffsets(CPDF_Page* pPage,
+                                    int start_x,
+                                    int start_y,
+                                    int size_x,
+                                    int size_y,
+                                    int rotate,
+                                    const CFX_FloatRect& mask_box) {
+  double scale_x = 0.0f;
+  double scale_y = 0.0f;
+  GetScaling(pPage, size_x, size_y, rotate, &scale_x, &scale_y);
+  if (scale_x < kEpsilonSize || scale_y < kEpsilonSize)
+    return FX_RECT();
+
+  // Compute sizes in page points. Round down to catch the entire bitmap.
+  int start_x_bm = static_cast<int>(mask_box.left * scale_x);
+  int start_y_bm = static_cast<int>(mask_box.bottom * scale_y);
+  int size_x_bm = static_cast<int>(mask_box.right * scale_x + 1.0f) -
+                  static_cast<int>(mask_box.left * scale_x);
+  int size_y_bm = static_cast<int>(mask_box.top * scale_y + 1.0f) -
+                  static_cast<int>(mask_box.bottom * scale_y);
+
+  // Get page rotation
+  int page_rotation = pPage->GetPageRotation();
+
+  // Compute offsets
+  int offset_x = 0;
+  int offset_y = 0;
+  if (size_x > size_y)
+    std::swap(size_x_bm, size_y_bm);
+
+  switch ((rotate + page_rotation) % 4) {
+    case 0:
+      offset_x = start_x_bm + start_x;
+      offset_y = start_y + size_y - size_y_bm - start_y_bm;
+      break;
+    case 1:
+      offset_x = start_y_bm + start_x;
+      offset_y = start_x_bm + start_y;
+      break;
+    case 2:
+      offset_x = start_x + size_x - size_x_bm - start_x_bm;
+      offset_y = start_y_bm + start_y;
+      break;
+    case 3:
+      offset_x = start_x + size_x - size_x_bm - start_y_bm;
+      offset_y = start_y + size_y - size_y_bm - start_x_bm;
+      break;
+  }
+  return FX_RECT(offset_x, offset_y, offset_x + size_x_bm,
+                 offset_y + size_y_bm);
+}
+
+// Get a bitmap of just the mask section defined by |mask_box| from a full page
+// bitmap |pBitmap|.
+RetainPtr<CFX_DIBitmap> GetMaskBitmap(CPDF_Page* pPage,
+                                      int start_x,
+                                      int start_y,
+                                      int size_x,
+                                      int size_y,
+                                      int rotate,
+                                      const RetainPtr<CFX_DIBitmap>& pSrc,
+                                      const CFX_FloatRect& mask_box,
+                                      FX_RECT* bitmap_area) {
+  ASSERT(bitmap_area);
+  *bitmap_area = GetMaskDimensionsAndOffsets(pPage, start_x, start_y, size_x,
+                                             size_y, rotate, mask_box);
+  if (bitmap_area->IsEmpty())
+    return nullptr;
+
+  // Create a new bitmap to transfer part of the page bitmap to.
+  RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>();
+  pDst->Create(bitmap_area->Width(), bitmap_area->Height(), FXDIB_Argb);
+  pDst->Clear(0x00ffffff);
+  pDst->TransferBitmap(0, 0, bitmap_area->Width(), bitmap_area->Height(), pSrc,
+                       bitmap_area->left, bitmap_area->top);
+  return pDst;
+}
+
+void RenderBitmap(CFX_RenderDevice* device,
+                  const RetainPtr<CFX_DIBitmap>& pSrc,
+                  const FX_RECT& mask_area) {
+  int size_x_bm = mask_area.Width();
+  int size_y_bm = mask_area.Height();
+  if (size_x_bm == 0 || size_y_bm == 0)
+    return;
+
+  // Create a new bitmap from the old one
+  RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>();
+  pDst->Create(size_x_bm, size_y_bm, FXDIB_Rgb32);
+  pDst->Clear(0xffffffff);
+  pDst->CompositeBitmap(0, 0, size_x_bm, size_y_bm, pSrc, 0, 0,
+                        FXDIB_BLEND_NORMAL, nullptr, false);
+
+  if (device->GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
+    device->StretchDIBits(pDst, mask_area.left, mask_area.top, size_x_bm,
+                          size_y_bm);
+  } else {
+    device->SetDIBits(pDst, mask_area.left, mask_area.top);
+  }
+}
+
+}  // namespace
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPage(HDC dc,
+                                               FPDF_PAGE page,
+                                               int start_x,
+                                               int start_y,
+                                               int size_x,
+                                               int size_y,
+                                               int rotate,
+                                               int flags) {
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return;
+  pPage->SetRenderContext(pdfium::MakeUnique<CPDF_PageRenderContext>());
+  CPDF_PageRenderContext* pContext = pPage->GetRenderContext();
+
+  RetainPtr<CFX_DIBitmap> pBitmap;
+  // Don't render the full page to bitmap for a mask unless there are a lot
+  // of masks. Full page bitmaps result in large spool sizes, so they should
+  // only be used when necessary. For large numbers of masks, rendering each
+  // individually is inefficient and unlikely to significantly improve spool
+  // size. TODO (rbpotter): Find out why this still breaks printing for some
+  // PDFs (see crbug.com/777837).
+  const bool bEnableImageMasks = false;
+  const bool bNewBitmap = pPage->BackgroundAlphaNeeded() ||
+                          (pPage->HasImageMask() && !bEnableImageMasks) ||
+                          pPage->GetMaskBoundingBoxes().size() > 100;
+  const bool bHasMask = pPage->HasImageMask() && !bNewBitmap;
+  if (bNewBitmap || bHasMask) {
+    pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
+    pBitmap->Create(size_x, size_y, FXDIB_Argb);
+    pBitmap->Clear(0x00ffffff);
+    CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice;
+    pContext->m_pDevice = pdfium::WrapUnique(pDevice);
+    pDevice->Attach(pBitmap, false, nullptr, false);
+    if (bHasMask) {
+      pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>();
+      uint32_t option_flags = pContext->m_pOptions->GetFlags();
+      option_flags |= RENDER_BREAKFORMASKS;
+      pContext->m_pOptions->SetFlags(option_flags);
+    }
+  } else {
+    pContext->m_pDevice = pdfium::MakeUnique<CFX_WindowsRenderDevice>(dc);
+  }
+
+  FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
+                         rotate, flags, true, nullptr);
+
+  if (bHasMask) {
+    // Finish rendering the page to bitmap and copy the correct segments
+    // of the page to individual image mask bitmaps.
+    const std::vector<CFX_FloatRect>& mask_boxes =
+        pPage->GetMaskBoundingBoxes();
+    std::vector<FX_RECT> bitmap_areas(mask_boxes.size());
+    std::vector<RetainPtr<CFX_DIBitmap>> bitmaps(mask_boxes.size());
+    for (size_t i = 0; i < mask_boxes.size(); i++) {
+      bitmaps[i] =
+          GetMaskBitmap(pPage, start_x, start_y, size_x, size_y, rotate,
+                        pBitmap, mask_boxes[i], &bitmap_areas[i]);
+      pContext->m_pRenderer->Continue(nullptr);
+    }
+
+    // Reset rendering context
+    pPage->SetRenderContext(nullptr);
+
+    // Begin rendering to the printer. Add flag to indicate the renderer should
+    // pause after each image mask.
+    pPage->SetRenderContext(pdfium::MakeUnique<CPDF_PageRenderContext>());
+    pContext = pPage->GetRenderContext();
+    pContext->m_pDevice = pdfium::MakeUnique<CFX_WindowsRenderDevice>(dc);
+    pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>();
+
+    uint32_t option_flags = pContext->m_pOptions->GetFlags();
+    option_flags |= RENDER_BREAKFORMASKS;
+    pContext->m_pOptions->SetFlags(option_flags);
+
+    FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
+                           rotate, flags, true, nullptr);
+
+    // Render masks
+    for (size_t i = 0; i < mask_boxes.size(); i++) {
+      // Render the bitmap for the mask and free the bitmap.
+      if (bitmaps[i]) {  // will be null if mask has zero area
+        RenderBitmap(pContext->m_pDevice.get(), bitmaps[i], bitmap_areas[i]);
+      }
+      // Render the next portion of page.
+      pContext->m_pRenderer->Continue(nullptr);
+    }
+  } else if (bNewBitmap) {
+    CFX_WindowsRenderDevice WinDC(dc);
+    if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
+      auto pDst = pdfium::MakeRetain<CFX_DIBitmap>();
+      int pitch = pBitmap->GetPitch();
+      pDst->Create(size_x, size_y, FXDIB_Rgb32);
+      memset(pDst->GetBuffer(), -1, pitch * size_y);
+      pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap, 0, 0,
+                            FXDIB_BLEND_NORMAL, nullptr, false);
+      WinDC.StretchDIBits(pDst, 0, 0, size_x, size_y);
+    } else {
+      WinDC.SetDIBits(pBitmap, 0, 0);
+    }
+  }
+
+  pPage->SetRenderContext(nullptr);
+}
+#endif  // defined(_WIN32)
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
+                                                     FPDF_PAGE page,
+                                                     int start_x,
+                                                     int start_y,
+                                                     int size_x,
+                                                     int size_y,
+                                                     int rotate,
+                                                     int flags) {
+  if (!bitmap)
+    return;
+
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return;
+
+  CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
+  pPage->SetRenderContext(pdfium::WrapUnique(pContext));
+
+  CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice;
+  pContext->m_pDevice.reset(pDevice);
+
+  RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap));
+  pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
+  FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
+                         rotate, flags, true, nullptr);
+
+#ifdef _SKIA_SUPPORT_PATHS_
+  pDevice->Flush(true);
+  pBitmap->UnPreMultiply();
+#endif
+  pPage->SetRenderContext(nullptr);
+}
+
+FPDF_EXPORT void FPDF_CALLCONV
+FPDF_RenderPageBitmapWithMatrix(FPDF_BITMAP bitmap,
+                                FPDF_PAGE page,
+                                const FS_MATRIX* matrix,
+                                const FS_RECTF* clipping,
+                                int flags) {
+  if (!bitmap)
+    return;
+
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return;
+
+  CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
+  pPage->SetRenderContext(pdfium::WrapUnique(pContext));
+
+  CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice;
+  pContext->m_pDevice.reset(pDevice);
+
+  RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap));
+  pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
+
+  CFX_FloatRect clipping_rect;
+  if (clipping)
+    clipping_rect = CFXFloatRectFromFSRECTF(*clipping);
+  FX_RECT clip_rect = clipping_rect.ToFxRect();
+
+  CFX_Matrix transform_matrix = pPage->GetDisplayMatrix(
+      0, 0, pPage->GetPageWidth(), pPage->GetPageHeight(), 0);
+
+  if (matrix) {
+    transform_matrix.Concat(CFX_Matrix(matrix->a, matrix->b, matrix->c,
+                                       matrix->d, matrix->e, matrix->f));
+  }
+  RenderPageImpl(pContext, pPage, transform_matrix, clip_rect, flags, true,
+                 nullptr);
+
+  pPage->SetRenderContext(nullptr);
+}
+
+#ifdef _SKIA_SUPPORT_
+FPDF_EXPORT FPDF_RECORDER FPDF_CALLCONV FPDF_RenderPageSkp(FPDF_PAGE page,
+                                                           int size_x,
+                                                           int size_y) {
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return nullptr;
+
+  CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
+  pPage->SetRenderContext(pdfium::WrapUnique(pContext));
+  CFX_DefaultRenderDevice* skDevice = new CFX_DefaultRenderDevice;
+  FPDF_RECORDER recorder = skDevice->CreateRecorder(size_x, size_y);
+  pContext->m_pDevice.reset(skDevice);
+  FPDF_RenderPage_Retail(pContext, page, 0, 0, size_x, size_y, 0, 0, true,
+                         nullptr);
+  pPage->SetRenderContext(nullptr);
+  return recorder;
+}
+#endif
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_ClosePage(FPDF_PAGE page) {
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+  if (!page)
+    return;
+#ifdef PDF_ENABLE_XFA
+  // Take it back across the API and throw it away.
+  RetainPtr<CPDFXFA_Page>().Unleak(pPage);
+#else   // PDF_ENABLE_XFA
+  CPDFSDK_PageView* pPageView =
+      static_cast<CPDFSDK_PageView*>(pPage->GetView());
+  if (pPageView) {
+    // We're already destroying the pageview, so bail early.
+    if (pPageView->IsBeingDestroyed())
+      return;
+
+    if (pPageView->IsLocked()) {
+      pPageView->TakePageOwnership();
+      return;
+    }
+
+    bool owned = pPageView->OwnsPage();
+    // This will delete the |pPageView| object. We must cleanup the PageView
+    // first because it will attempt to reset the View on the |pPage| during
+    // destruction.
+    pPageView->GetFormFillEnv()->RemovePageView(pPage);
+    // If the page was owned then the pageview will have deleted the page.
+    if (owned)
+      return;
+  }
+  delete pPage;
+#endif  // PDF_ENABLE_XFA
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_CloseDocument(FPDF_DOCUMENT document) {
+  delete UnderlyingFromFPDFDocument(document);
+}
+
+FPDF_EXPORT unsigned long FPDF_CALLCONV FPDF_GetLastError() {
+  return GetLastError();
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_DeviceToPage(FPDF_PAGE page,
+                                                 int start_x,
+                                                 int start_y,
+                                                 int size_x,
+                                                 int size_y,
+                                                 int rotate,
+                                                 int device_x,
+                                                 int device_y,
+                                                 double* page_x,
+                                                 double* page_y) {
+  if (!page || !page_x || !page_y)
+    return;
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+#ifdef PDF_ENABLE_XFA
+  pPage->DeviceToPage(start_x, start_y, size_x, size_y, rotate, device_x,
+                      device_y, page_x, page_y);
+#else   // PDF_ENABLE_XFA
+  CFX_Matrix page2device =
+      pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate);
+
+  CFX_PointF pos = page2device.GetInverse().Transform(
+      CFX_PointF(static_cast<float>(device_x), static_cast<float>(device_y)));
+
+  *page_x = pos.x;
+  *page_y = pos.y;
+#endif  // PDF_ENABLE_XFA
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDF_PageToDevice(FPDF_PAGE page,
+                                                 int start_x,
+                                                 int start_y,
+                                                 int size_x,
+                                                 int size_y,
+                                                 int rotate,
+                                                 double page_x,
+                                                 double page_y,
+                                                 int* device_x,
+                                                 int* device_y) {
+  if (!device_x || !device_y)
+    return;
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+  if (!pPage)
+    return;
+#ifdef PDF_ENABLE_XFA
+  pPage->PageToDevice(start_x, start_y, size_x, size_y, rotate, page_x, page_y,
+                      device_x, device_y);
+#else   // PDF_ENABLE_XFA
+  CFX_Matrix page2device =
+      pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate);
+  CFX_PointF pos = page2device.Transform(
+      CFX_PointF(static_cast<float>(page_x), static_cast<float>(page_y)));
+
+  *device_x = FXSYS_round(pos.x);
+  *device_y = FXSYS_round(pos.y);
+#endif  // PDF_ENABLE_XFA
+}
+
+FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV FPDFBitmap_Create(int width,
+                                                        int height,
+                                                        int alpha) {
+  auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
+  if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32))
+    return nullptr;
+
+  return pBitmap.Leak();
+}
+
+FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV FPDFBitmap_CreateEx(int width,
+                                                          int height,
+                                                          int format,
+                                                          void* first_scan,
+                                                          int stride) {
+  FXDIB_Format fx_format;
+  switch (format) {
+    case FPDFBitmap_Gray:
+      fx_format = FXDIB_8bppRgb;
+      break;
+    case FPDFBitmap_BGR:
+      fx_format = FXDIB_Rgb;
+      break;
+    case FPDFBitmap_BGRx:
+      fx_format = FXDIB_Rgb32;
+      break;
+    case FPDFBitmap_BGRA:
+      fx_format = FXDIB_Argb;
+      break;
+    default:
+      return nullptr;
+  }
+  auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
+  pBitmap->Create(width, height, fx_format, static_cast<uint8_t*>(first_scan),
+                  stride);
+  return pBitmap.Leak();
+}
+
+FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetFormat(FPDF_BITMAP bitmap) {
+  if (!bitmap)
+    return FPDFBitmap_Unknown;
+
+  FXDIB_Format format = CFXBitmapFromFPDFBitmap(bitmap)->GetFormat();
+  switch (format) {
+    case FXDIB_8bppRgb:
+    case FXDIB_8bppMask:
+      return FPDFBitmap_Gray;
+    case FXDIB_Rgb:
+      return FPDFBitmap_BGR;
+    case FXDIB_Rgb32:
+      return FPDFBitmap_BGRx;
+    case FXDIB_Argb:
+      return FPDFBitmap_BGRA;
+    default:
+      return FPDFBitmap_Unknown;
+  }
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
+                                                   int left,
+                                                   int top,
+                                                   int width,
+                                                   int height,
+                                                   FPDF_DWORD color) {
+  if (!bitmap)
+    return;
+
+  CFX_DefaultRenderDevice device;
+  RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap));
+  device.Attach(pBitmap, false, nullptr, false);
+  if (!pBitmap->HasAlpha())
+    color |= 0xFF000000;
+  FX_RECT rect(left, top, left + width, top + height);
+  device.FillRect(&rect, color);
+}
+
+FPDF_EXPORT void* FPDF_CALLCONV FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) {
+  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetBuffer() : nullptr;
+}
+
+FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) {
+  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetWidth() : 0;
+}
+
+FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) {
+  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetHeight() : 0;
+}
+
+FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetStride(FPDF_BITMAP bitmap) {
+  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetPitch() : 0;
+}
+
+FPDF_EXPORT void FPDF_CALLCONV FPDFBitmap_Destroy(FPDF_BITMAP bitmap) {
+  RetainPtr<CFX_DIBitmap> destroyer;
+  destroyer.Unleak(CFXBitmapFromFPDFBitmap(bitmap));
+}
+
+void FPDF_RenderPage_Retail(CPDF_PageRenderContext* pContext,
+                            FPDF_PAGE page,
+                            int start_x,
+                            int start_y,
+                            int size_x,
+                            int size_y,
+                            int rotate,
+                            int flags,
+                            bool bNeedToRestore,
+                            IPDFSDK_PauseAdapter* pause) {
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return;
+
+  RenderPageImpl(
+      pContext, pPage,
+      pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate),
+      FX_RECT(start_x, start_y, start_x + size_x, start_y + size_y), flags,
+      bNeedToRestore, pause);
+}
+
+FPDF_EXPORT int FPDF_CALLCONV FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,
+                                                      int page_index,
+                                                      double* width,
+                                                      double* height) {
+  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
+  if (!pDoc)
+    return false;
+
+#ifdef PDF_ENABLE_XFA
+  int count = pDoc->GetPageCount();
+  if (page_index < 0 || page_index >= count)
+    return false;
+  RetainPtr<CPDFXFA_Page> pPage = pDoc->GetXFAPage(page_index);
+  if (!pPage)
+    return false;
+  *width = pPage->GetPageWidth();
+  *height = pPage->GetPageHeight();
+#else   // PDF_ENABLE_XFA
+  CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
+  if (!pDict)
+    return false;
+
+  CPDF_Page page(pDoc, pDict, true);
+  *width = page.GetPageWidth();
+  *height = page.GetPageHeight();
+#endif  // PDF_ENABLE_XFA
+
+  return true;
+}
+
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
+FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return true;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  return viewRef.PrintScaling();
+}
+
+FPDF_EXPORT int FPDF_CALLCONV
+FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return 1;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  return viewRef.NumCopies();
+}
+
+FPDF_EXPORT FPDF_PAGERANGE FPDF_CALLCONV
+FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  return viewRef.PrintPageRange();
+}
+
+FPDF_EXPORT FPDF_DUPLEXTYPE FPDF_CALLCONV
+FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return DuplexUndefined;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  ByteString duplex = viewRef.Duplex();
+  if ("Simplex" == duplex)
+    return Simplex;
+  if ("DuplexFlipShortEdge" == duplex)
+    return DuplexFlipShortEdge;
+  if ("DuplexFlipLongEdge" == duplex)
+    return DuplexFlipLongEdge;
+  return DuplexUndefined;
+}
+
+FPDF_EXPORT unsigned long FPDF_CALLCONV
+FPDF_VIEWERREF_GetName(FPDF_DOCUMENT document,
+                       FPDF_BYTESTRING key,
+                       char* buffer,
+                       unsigned long length) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return 0;
+
+  CPDF_ViewerPreferences viewRef(pDoc);
+  ByteString bsVal;
+  if (!viewRef.GenericName(key, &bsVal))
+    return 0;
+
+  unsigned long dwStringLen = bsVal.GetLength() + 1;
+  if (buffer && length >= dwStringLen)
+    memcpy(buffer, bsVal.c_str(), dwStringLen);
+  return dwStringLen;
+}
+
+FPDF_EXPORT FPDF_DWORD FPDF_CALLCONV
+FPDF_CountNamedDests(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return 0;
+
+  const CPDF_Dictionary* pRoot = pDoc->GetRoot();
+  if (!pRoot)
+    return 0;
+
+  CPDF_NameTree nameTree(pDoc, "Dests");
+  pdfium::base::CheckedNumeric<FPDF_DWORD> count = nameTree.GetCount();
+  CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests");
+  if (pDest)
+    count += pDest->GetCount();
+
+  if (!count.IsValid())
+    return 0;
+
+  return count.ValueOrDie();
+}
+
+FPDF_EXPORT FPDF_DEST FPDF_CALLCONV
+FPDF_GetNamedDestByName(FPDF_DOCUMENT document, FPDF_BYTESTRING name) {
+  if (!name || name[0] == 0)
+    return nullptr;
+
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
+
+  CPDF_NameTree name_tree(pDoc, "Dests");
+  return name_tree.LookupNamedDest(pDoc, PDF_DecodeText(ByteString(name)));
+}
+
+#ifdef PDF_ENABLE_XFA
+FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Init(FPDF_BSTR* str) {
+  if (!str)
+    return -1;
+
+  memset(str, 0, sizeof(FPDF_BSTR));
+  return 0;
+}
+
+FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Set(FPDF_BSTR* str,
+                                                    FPDF_LPCSTR bstr,
+                                                    int length) {
+  if (!str || !bstr || !length)
+    return -1;
+
+  if (length == -1)
+    length = strlen(bstr);
+
+  if (length == 0) {
+    FPDF_BStr_Clear(str);
+    return 0;
+  }
+
+  if (str->str && str->len < length)
+    str->str = FX_Realloc(char, str->str, length + 1);
+  else if (!str->str)
+    str->str = FX_Alloc(char, length + 1);
+
+  str->str[length] = 0;
+  memcpy(str->str, bstr, length);
+  str->len = length;
+
+  return 0;
+}
+
+FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Clear(FPDF_BSTR* str) {
+  if (!str)
+    return -1;
+
+  if (str->str) {
+    FX_Free(str->str);
+    str->str = nullptr;
+  }
+  str->len = 0;
+  return 0;
+}
+#endif  // PDF_ENABLE_XFA
+
+FPDF_EXPORT FPDF_DEST FPDF_CALLCONV FPDF_GetNamedDest(FPDF_DOCUMENT document,
+                                                      int index,
+                                                      void* buffer,
+                                                      long* buflen) {
+  if (!buffer)
+    *buflen = 0;
+
+  if (index < 0)
+    return nullptr;
+
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
+
+  const CPDF_Dictionary* pRoot = pDoc->GetRoot();
+  if (!pRoot)
+    return nullptr;
+
+  CPDF_Object* pDestObj = nullptr;
+  WideString wsName;
+  CPDF_NameTree nameTree(pDoc, "Dests");
+  int count = nameTree.GetCount();
+  if (index >= count) {
+    CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests");
+    if (!pDest)
+      return nullptr;
+
+    pdfium::base::CheckedNumeric<int> checked_count = count;
+    checked_count += pDest->GetCount();
+    if (!checked_count.IsValid() || index >= checked_count.ValueOrDie())
+      return nullptr;
+
+    index -= count;
+    int i = 0;
+    ByteString bsName;
+    for (const auto& it : *pDest) {
+      bsName = it.first;
+      pDestObj = it.second.get();
+      if (!pDestObj)
+        continue;
+      if (i == index)
+        break;
+      i++;
+    }
+    wsName = PDF_DecodeText(bsName);
+  } else {
+    pDestObj = nameTree.LookupValueAndName(index, &wsName);
+  }
+  if (!pDestObj)
+    return nullptr;
+  if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
+    pDestObj = pDict->GetArrayFor("D");
+    if (!pDestObj)
+      return nullptr;
+  }
+  if (!pDestObj->IsArray())
+    return nullptr;
+
+  ByteString utf16Name = wsName.UTF16LE_Encode();
+  int len = utf16Name.GetLength();
+  if (!buffer) {
+    *buflen = len;
+  } else if (len <= *buflen) {
+    memcpy(buffer, utf16Name.c_str(), len);
+    *buflen = len;
+  } else {
+    *buflen = -1;
+  }
+  return (FPDF_DEST)pDestObj;
+}