summaryrefslogtreecommitdiff
path: root/fpdfsdk/src/fpdfview.cpp
blob: e59515a86353a99cacca99c9e3b7637a084868b2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
// 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 <memory>

#include "core/include/fxcodec/fx_codec.h"
#include "core/include/fxcrt/fx_safe_types.h"
#include "fpdfsdk/include/fsdk_define.h"
#include "fpdfsdk/include/fsdk_mgr.h"
#include "fpdfsdk/include/fsdk_rendercontext.h"
#include "fpdfsdk/include/javascript/IJavaScript.h"
#include "public/fpdf_ext.h"
#include "public/fpdf_progressive.h"
#include "third_party/base/numerics/safe_conversions_impl.h"

UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc) {
  return static_cast<UnderlyingDocumentType*>(doc);
}

FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc) {
  return static_cast<FPDF_DOCUMENT>(doc);
}

UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page) {
  return static_cast<UnderlyingPageType*>(page);
}

CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc) {
  return UnderlyingFromFPDFDocument(doc);
}

FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc) {
  return FPDFDocumentFromUnderlying(doc);
}

CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page) {
  return UnderlyingFromFPDFPage(page);
}

CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess) {
  m_FileAccess = *pFileAccess;
}

FX_BOOL CPDF_CustomAccess::ReadBlock(void* buffer,
                                     FX_FILESIZE offset,
                                     size_t size) {
  if (offset < 0) {
    return FALSE;
  }
  FX_SAFE_FILESIZE newPos =
      pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
  newPos += offset;
  if (!newPos.IsValid() || newPos.ValueOrDie() > m_FileAccess.m_FileLen) {
    return FALSE;
  }
  return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset, (uint8_t*)buffer,
                                 size);
}

// 0 bit: FPDF_POLICY_MACHINETIME_ACCESS
static FX_DWORD foxit_sandbox_policy = 0xFFFFFFFF;

void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable) {
  switch (policy) {
    case FPDF_POLICY_MACHINETIME_ACCESS: {
      if (enable)
        foxit_sandbox_policy |= 0x01;
      else
        foxit_sandbox_policy &= 0xFFFFFFFE;
    } break;
    default:
      break;
  }
}

FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy) {
  switch (policy) {
    case FPDF_POLICY_MACHINETIME_ACCESS:
      return !!(foxit_sandbox_policy & 0x01);
    default:
      return FALSE;
  }
}

CCodec_ModuleMgr* g_pCodecModule = nullptr;

DLLEXPORT void STDCALL FPDF_InitLibrary() {
  FPDF_InitLibraryWithConfig(nullptr);
}

DLLEXPORT void STDCALL FPDF_InitLibraryWithConfig(
    const FPDF_LIBRARY_CONFIG* cfg) {
  g_pCodecModule = new CCodec_ModuleMgr();

  CFX_GEModule::Create(cfg ? cfg->m_pUserFontPaths : nullptr);
  CFX_GEModule::Get()->SetCodecModule(g_pCodecModule);

  CPDF_ModuleMgr::Create();
  CPDF_ModuleMgr* pModuleMgr = CPDF_ModuleMgr::Get();
  pModuleMgr->SetCodecModule(g_pCodecModule);
  pModuleMgr->InitPageModule();
  pModuleMgr->InitRenderModule();
  pModuleMgr->LoadEmbeddedGB1CMaps();
  pModuleMgr->LoadEmbeddedJapan1CMaps();
  pModuleMgr->LoadEmbeddedCNS1CMaps();
  pModuleMgr->LoadEmbeddedKorea1CMaps();
  if (cfg && cfg->version >= 2)
    IJS_Runtime::Initialize(cfg->m_v8EmbedderSlot, cfg->m_pIsolate);
}

DLLEXPORT void STDCALL FPDF_DestroyLibrary() {
  CPDF_ModuleMgr::Destroy();
  CFX_GEModule::Destroy();

  delete g_pCodecModule;
  g_pCodecModule = nullptr;
}

#ifndef _WIN32
int g_LastError;
void SetLastError(int err) {
  g_LastError = err;
}

int GetLastError() {
  return g_LastError;
}
#endif

void ProcessParseError(FX_DWORD err_code) {
  // Translate FPDFAPI error code to FPDFVIEW error code
  switch (err_code) {
    case PDFPARSE_ERROR_FILE:
      err_code = FPDF_ERR_FILE;
      break;
    case PDFPARSE_ERROR_FORMAT:
      err_code = FPDF_ERR_FORMAT;
      break;
    case PDFPARSE_ERROR_PASSWORD:
      err_code = FPDF_ERR_PASSWORD;
      break;
    case PDFPARSE_ERROR_HANDLER:
      err_code = FPDF_ERR_SECURITY;
      break;
  }
  SetLastError(err_code);
}

DLLEXPORT void STDCALL FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
                                             FPDF_BOOL enable) {
  return FSDK_SetSandBoxPolicy(policy, enable);
}

DLLEXPORT FPDF_DOCUMENT STDCALL 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.
  IFX_FileRead* pFileAccess = FX_CreateFileRead((const FX_CHAR*)file_path);
  if (!pFileAccess) {
    return nullptr;
  }

  CPDF_Parser* pParser = new CPDF_Parser;
  pParser->SetPassword(password);

  FX_DWORD err_code = pParser->StartParse(pFileAccess);
  if (err_code) {
    delete pParser;
    ProcessParseError(err_code);
    return NULL;
  }
  return pParser->GetDocument();
}

class CMemFile final : public IFX_FileRead {
 public:
  CMemFile(uint8_t* pBuf, FX_FILESIZE size) : m_pBuf(pBuf), m_size(size) {}

  void Release() override { delete this; }
  FX_FILESIZE GetSize() override { return m_size; }
  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
    if (offset < 0) {
      return FALSE;
    }
    FX_SAFE_FILESIZE newPos =
        pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
    newPos += offset;
    if (!newPos.IsValid() || newPos.ValueOrDie() > (FX_DWORD)m_size) {
      return FALSE;
    }
    FXSYS_memcpy(buffer, m_pBuf + offset, size);
    return TRUE;
  }

 private:
  ~CMemFile() override {}

  uint8_t* const m_pBuf;
  const FX_FILESIZE m_size;
};

DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadMemDocument(const void* data_buf,
                                                     int size,
                                                     FPDF_BYTESTRING password) {
  CPDF_Parser* pParser = new CPDF_Parser;
  pParser->SetPassword(password);
  CMemFile* pMemFile = new CMemFile((uint8_t*)data_buf, size);
  FX_DWORD err_code = pParser->StartParse(pMemFile);
  if (err_code) {
    delete pParser;
    ProcessParseError(err_code);
    return NULL;
  }
  CPDF_Document* pDoc = NULL;
  pDoc = pParser ? pParser->GetDocument() : NULL;
  CheckUnSupportError(pDoc, err_code);
  return FPDFDocumentFromCPDFDocument(pParser->GetDocument());
}

DLLEXPORT FPDF_DOCUMENT STDCALL
FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess,
                        FPDF_BYTESTRING password) {
  CPDF_Parser* pParser = new CPDF_Parser;
  pParser->SetPassword(password);
  CPDF_CustomAccess* pFile = new CPDF_CustomAccess(pFileAccess);
  FX_DWORD err_code = pParser->StartParse(pFile);
  if (err_code) {
    delete pParser;
    ProcessParseError(err_code);
    return NULL;
  }
  CPDF_Document* pDoc = NULL;
  pDoc = pParser ? pParser->GetDocument() : NULL;
  CheckUnSupportError(pDoc, err_code);
  return FPDFDocumentFromCPDFDocument(pParser->GetDocument());
}

DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc,
                                                int* fileVersion) {
  if (!fileVersion)
    return FALSE;

  *fileVersion = 0;
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc);
  if (!pDoc)
    return FALSE;

  CPDF_Parser* pParser = pDoc->GetParser();
  if (!pParser)
    return FALSE;

  *fileVersion = pParser->GetFileVersion();
  return TRUE;
}

// jabdelmalek: changed return type from FX_DWORD to build on Linux (and match
// header).
DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return 0;

  CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
  return pDict ? pDict->GetInteger("P") : (FX_DWORD)-1;
}

DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return -1;

  CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
  return pDict ? pDict->GetInteger("R") : -1;
}

DLLEXPORT int STDCALL FPDF_GetPageCount(FPDF_DOCUMENT document) {
  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
  return pDoc ? pDoc->GetPageCount() : 0;
}

DLLEXPORT FPDF_PAGE STDCALL 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;

  CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
  if (!pDict)
    return NULL;
  CPDF_Page* pPage = new CPDF_Page;
  pPage->Load(pDoc, pDict);
  pPage->ParseContent();
  return pPage;
}

DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page) {
  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
  return pPage ? pPage->GetPageWidth() : 0.0;
}

DLLEXPORT double STDCALL FPDF_GetPageHeight(FPDF_PAGE page) {
  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
  return pPage ? pPage->GetPageHeight() : 0.0;
}

void DropContext(void* data) {
  delete (CRenderContext*)data;
}

#if defined(_DEBUG) || defined(DEBUG)
#define DEBUG_TRACE
#endif

#if defined(_WIN32)
DLLEXPORT void STDCALL 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;

  CRenderContext* pContext = new CRenderContext;
  pPage->SetPrivateData((void*)1, pContext, DropContext);

#ifndef _WIN32_WCE
  CFX_DIBitmap* pBitmap = nullptr;
  FX_BOOL bBackgroundAlphaNeeded = pPage->BackgroundAlphaNeeded();
  FX_BOOL bHasImageMask = pPage->HasImageMask();
  if (bBackgroundAlphaNeeded || bHasImageMask) {
    pBitmap = new CFX_DIBitmap;
    pBitmap->Create(size_x, size_y, FXDIB_Argb);
    pBitmap->Clear(0x00ffffff);
#ifdef _SKIA_SUPPORT_
    pContext->m_pDevice = new CFX_SkiaDevice;
    ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
#else
    pContext->m_pDevice = new CFX_FxgeDevice;
    ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
#endif
  } else {
    pContext->m_pDevice = new CFX_WindowsDevice(dc);
  }

  FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
                         rotate, flags, TRUE, NULL);

  if (bBackgroundAlphaNeeded || bHasImageMask) {
    if (pBitmap) {
      CFX_WindowsDevice WinDC(dc);

      if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
        CFX_DIBitmap* pDst = new CFX_DIBitmap;
        int pitch = pBitmap->GetPitch();
        pDst->Create(size_x, size_y, FXDIB_Rgb32);
        FXSYS_memset(pDst->GetBuffer(), -1, pitch * size_y);
        pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap, 0, 0,
                              FXDIB_BLEND_NORMAL, NULL, FALSE, NULL);
        WinDC.StretchDIBits(pDst, 0, 0, size_x, size_y);
        delete pDst;
      } else {
        WinDC.SetDIBits(pBitmap, 0, 0);
      }
    }
  }
#else
  // get clip region
  RECT rect, cliprect;
  rect.left = start_x;
  rect.top = start_y;
  rect.right = start_x + size_x;
  rect.bottom = start_y + size_y;
  GetClipBox(dc, &cliprect);
  IntersectRect(&rect, &rect, &cliprect);
  int width = rect.right - rect.left;
  int height = rect.bottom - rect.top;

#ifdef DEBUG_TRACE
  {
    char str[128];
    memset(str, 0, sizeof(str));
    FXSYS_snprintf(str, sizeof(str) - 1, "Rendering DIB %d x %d", width,
                   height);
    CPDF_ModuleMgr::Get()->ReportError(999, str);
  }
#endif

  // Create a DIB section
  LPVOID pBuffer;
  BITMAPINFOHEADER bmih;
  FXSYS_memset(&bmih, 0, sizeof bmih);
  bmih.biSize = sizeof bmih;
  bmih.biBitCount = 24;
  bmih.biHeight = -height;
  bmih.biPlanes = 1;
  bmih.biWidth = width;
  pContext->m_hBitmap = CreateDIBSection(dc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS,
                                         &pBuffer, NULL, 0);
  if (!pContext->m_hBitmap) {
#if defined(DEBUG) || defined(_DEBUG)
    char str[128];
    memset(str, 0, sizeof(str));
    FXSYS_snprintf(str, sizeof(str) - 1,
                   "Error CreateDIBSection: %d x %d, error code = %d", width,
                   height, GetLastError());
    CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, str);
#else
    CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, NULL);
#endif
  }
  FXSYS_memset(pBuffer, 0xff, height * ((width * 3 + 3) / 4 * 4));

#ifdef DEBUG_TRACE
  { CPDF_ModuleMgr::Get()->ReportError(999, "DIBSection created"); }
#endif

  // Create a device with this external buffer
  pContext->m_pBitmap = new CFX_DIBitmap;
  pContext->m_pBitmap->Create(width, height, FXDIB_Rgb, (uint8_t*)pBuffer);
  pContext->m_pDevice = new CPDF_FxgeDevice;
  ((CPDF_FxgeDevice*)pContext->m_pDevice)->Attach(pContext->m_pBitmap);

#ifdef DEBUG_TRACE
  CPDF_ModuleMgr::Get()->ReportError(999, "Ready for PDF rendering");
#endif

  // output to bitmap device
  FPDF_RenderPage_Retail(pContext, page, start_x - rect.left,
                         start_y - rect.top, size_x, size_y, rotate, flags);

#ifdef DEBUG_TRACE
  CPDF_ModuleMgr::Get()->ReportError(999, "Finished PDF rendering");
#endif

  // Now output to real device
  HDC hMemDC = CreateCompatibleDC(dc);
  if (!hMemDC) {
#if defined(DEBUG) || defined(_DEBUG)
    char str[128];
    memset(str, 0, sizeof(str));
    FXSYS_snprintf(str, sizeof(str) - 1,
                   "Error CreateCompatibleDC. Error code = %d", GetLastError());
    CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, str);
#else
    CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, NULL);
#endif
  }

  HGDIOBJ hOldBitmap = SelectObject(hMemDC, pContext->m_hBitmap);

#ifdef DEBUG_TRACE
  CPDF_ModuleMgr::Get()->ReportError(999, "Ready for screen rendering");
#endif

  BitBlt(dc, rect.left, rect.top, width, height, hMemDC, 0, 0, SRCCOPY);
  SelectObject(hMemDC, hOldBitmap);
  DeleteDC(hMemDC);

#ifdef DEBUG_TRACE
  CPDF_ModuleMgr::Get()->ReportError(999, "Finished screen rendering");
#endif

#endif
  if (bBackgroundAlphaNeeded || bHasImageMask)
    delete pBitmap;

  delete pContext;
  pPage->RemovePrivateData((void*)1);
}
#endif

DLLEXPORT void STDCALL 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;
  CRenderContext* pContext = new CRenderContext;
  pPage->SetPrivateData((void*)1, pContext, DropContext);
#ifdef _SKIA_SUPPORT_
  pContext->m_pDevice = new CFX_SkiaDevice;

  if (flags & FPDF_REVERSE_BYTE_ORDER)
    ((CFX_SkiaDevice*)pContext->m_pDevice)
        ->Attach((CFX_DIBitmap*)bitmap, 0, TRUE);
  else
    ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
#else
  pContext->m_pDevice = new CFX_FxgeDevice;

  if (flags & FPDF_REVERSE_BYTE_ORDER)
    ((CFX_FxgeDevice*)pContext->m_pDevice)
        ->Attach((CFX_DIBitmap*)bitmap, 0, TRUE);
  else
    ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
#endif

  FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
                         rotate, flags, TRUE, NULL);

  delete pContext;
  pPage->RemovePrivateData((void*)1);
}

DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page) {
  if (!page)
    return;
  CPDFSDK_PageView* pPageView =
      (CPDFSDK_PageView*)(((CPDF_Page*)page))->GetPrivateData((void*)page);
  if (pPageView && pPageView->IsLocked()) {
    pPageView->TakeOverPage();
    return;
  }
  delete (CPDF_Page*)page;
}

DLLEXPORT void STDCALL FPDF_CloseDocument(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return;

  CPDF_Parser* pParser = (CPDF_Parser*)pDoc->GetParser();
  if (!pParser) {
    delete pDoc;
    return;
  }
  delete pParser;
}

DLLEXPORT unsigned long STDCALL FPDF_GetLastError() {
  return GetLastError();
}

DLLEXPORT void STDCALL 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);

  CFX_Matrix page2device;
  pPage->GetDisplayMatrix(page2device, start_x, start_y, size_x, size_y,
                          rotate);
  CFX_Matrix device2page;
  device2page.SetReverse(page2device);

  FX_FLOAT page_x_f, page_y_f;
  device2page.Transform((FX_FLOAT)(device_x), (FX_FLOAT)(device_y), page_x_f,
                        page_y_f);

  *page_x = (page_x_f);
  *page_y = (page_y_f);
}

DLLEXPORT void STDCALL 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;
  CFX_Matrix page2device;
  pPage->GetDisplayMatrix(page2device, start_x, start_y, size_x, size_y,
                          rotate);

  FX_FLOAT device_x_f, device_y_f;
  page2device.Transform(((FX_FLOAT)page_x), ((FX_FLOAT)page_y), device_x_f,
                        device_y_f);

  *device_x = FXSYS_round(device_x_f);
  *device_y = FXSYS_round(device_y_f);
}

DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_Create(int width,
                                                int height,
                                                int alpha) {
  std::unique_ptr<CFX_DIBitmap> pBitmap(new CFX_DIBitmap);
  if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32)) {
    return NULL;
  }
  return pBitmap.release();
}

DLLEXPORT FPDF_BITMAP STDCALL 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 NULL;
  }
  CFX_DIBitmap* pBitmap = new CFX_DIBitmap;
  pBitmap->Create(width, height, fx_format, (uint8_t*)first_scan, stride);
  return pBitmap;
}

DLLEXPORT void STDCALL FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
                                           int left,
                                           int top,
                                           int width,
                                           int height,
                                           FPDF_DWORD color) {
  if (!bitmap)
    return;
#ifdef _SKIA_SUPPORT_
  CFX_SkiaDevice device;
#else
  CFX_FxgeDevice device;
#endif
  device.Attach((CFX_DIBitmap*)bitmap);
  if (!((CFX_DIBitmap*)bitmap)->HasAlpha())
    color |= 0xFF000000;
  FX_RECT rect(left, top, left + width, top + height);
  device.FillRect(&rect, color);
}

DLLEXPORT void* STDCALL FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) {
  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetBuffer() : nullptr;
}

DLLEXPORT int STDCALL FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) {
  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetWidth() : 0;
}

DLLEXPORT int STDCALL FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) {
  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetHeight() : 0;
}

DLLEXPORT int STDCALL FPDFBitmap_GetStride(FPDF_BITMAP bitmap) {
  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetPitch() : 0;
}

DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap) {
  delete (CFX_DIBitmap*)bitmap;
}

void FPDF_RenderPage_Retail(CRenderContext* pContext,
                            FPDF_PAGE page,
                            int start_x,
                            int start_y,
                            int size_x,
                            int size_y,
                            int rotate,
                            int flags,
                            FX_BOOL bNeedToRestore,
                            IFSDK_PAUSE_Adapter* pause) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage)
    return;

  if (!pContext->m_pOptions)
    pContext->m_pOptions = new CPDF_RenderOptions;

  if (flags & FPDF_LCD_TEXT)
    pContext->m_pOptions->m_Flags |= RENDER_CLEARTYPE;
  else
    pContext->m_pOptions->m_Flags &= ~RENDER_CLEARTYPE;
  if (flags & FPDF_NO_NATIVETEXT)
    pContext->m_pOptions->m_Flags |= RENDER_NO_NATIVETEXT;
  if (flags & FPDF_RENDER_LIMITEDIMAGECACHE)
    pContext->m_pOptions->m_Flags |= RENDER_LIMITEDIMAGECACHE;
  if (flags & FPDF_RENDER_FORCEHALFTONE)
    pContext->m_pOptions->m_Flags |= RENDER_FORCE_HALFTONE;
  if (flags & FPDF_RENDER_NO_SMOOTHTEXT)
    pContext->m_pOptions->m_Flags |= RENDER_NOTEXTSMOOTH;
  if (flags & FPDF_RENDER_NO_SMOOTHIMAGE)
    pContext->m_pOptions->m_Flags |= RENDER_NOIMAGESMOOTH;
  if (flags & FPDF_RENDER_NO_SMOOTHPATH)
    pContext->m_pOptions->m_Flags |= RENDER_NOPATHSMOOTH;
  // Grayscale output
  if (flags & FPDF_GRAYSCALE) {
    pContext->m_pOptions->m_ColorMode = RENDER_COLOR_GRAY;
    pContext->m_pOptions->m_ForeColor = 0;
    pContext->m_pOptions->m_BackColor = 0xffffff;
  }
  const CPDF_OCContext::UsageType usage =
      (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View;
  pContext->m_pOptions->m_AddFlags = flags >> 8;
  pContext->m_pOptions->m_pOCContext =
      new CPDF_OCContext(pPage->m_pDocument, usage);

  CFX_Matrix matrix;
  pPage->GetDisplayMatrix(matrix, start_x, start_y, size_x, size_y, rotate);

  FX_RECT clip;
  clip.left = start_x;
  clip.right = start_x + size_x;
  clip.top = start_y;
  clip.bottom = start_y + size_y;
  pContext->m_pDevice->SaveState();
  pContext->m_pDevice->SetClip_Rect(&clip);

  pContext->m_pContext = new CPDF_RenderContext(pPage);
  pContext->m_pContext->AppendObjectList(pPage, &matrix);

  if (flags & FPDF_ANNOT) {
    pContext->m_pAnnots = new CPDF_AnnotList(pPage);
    FX_BOOL bPrinting = pContext->m_pDevice->GetDeviceClass() != FXDC_DISPLAY;
    pContext->m_pAnnots->DisplayAnnots(pPage, pContext->m_pContext, bPrinting,
                                       &matrix, TRUE, NULL);
  }

  pContext->m_pRenderer = new CPDF_ProgressiveRenderer(
      pContext->m_pContext, pContext->m_pDevice, pContext->m_pOptions);
  pContext->m_pRenderer->Start(pause);
  if (bNeedToRestore)
    pContext->m_pDevice->RestoreState();
}

DLLEXPORT int STDCALL FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,
                                              int page_index,
                                              double* width,
                                              double* height) {
  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
  if (!pDoc)
    return FALSE;

  CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
  if (!pDict)
    return FALSE;

  CPDF_Page page;
  page.Load(pDoc, pDict);
  *width = page.GetPageWidth();
  *height = page.GetPageHeight();

  return TRUE;
}

DLLEXPORT FPDF_BOOL STDCALL
FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return TRUE;
  CPDF_ViewerPreferences viewRef(pDoc);
  return viewRef.PrintScaling();
}

DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return 1;
  CPDF_ViewerPreferences viewRef(pDoc);
  return viewRef.NumCopies();
}

DLLEXPORT FPDF_PAGERANGE STDCALL
FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return NULL;
  CPDF_ViewerPreferences viewRef(pDoc);
  return viewRef.PrintPageRange();
}

DLLEXPORT FPDF_DUPLEXTYPE STDCALL
FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return DuplexUndefined;
  CPDF_ViewerPreferences viewRef(pDoc);
  CFX_ByteString duplex = viewRef.Duplex();
  if ("Simplex" == duplex)
    return Simplex;
  if ("DuplexFlipShortEdge" == duplex)
    return DuplexFlipShortEdge;
  if ("DuplexFlipLongEdge" == duplex)
    return DuplexFlipLongEdge;
  return DuplexUndefined;
}

DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return 0;

  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->GetDict("Dests");
  if (pDest)
    count += pDest->GetCount();

  if (!count.IsValid())
    return 0;

  return count.ValueOrDie();
}

DLLEXPORT FPDF_DEST STDCALL 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, name);
}

DLLEXPORT FPDF_DEST STDCALL 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;

  CPDF_Dictionary* pRoot = pDoc->GetRoot();
  if (!pRoot)
    return nullptr;

  CPDF_Object* pDestObj = nullptr;
  CFX_ByteString bsName;
  CPDF_NameTree nameTree(pDoc, "Dests");
  int count = nameTree.GetCount();
  if (index >= count) {
    CPDF_Dictionary* pDest = pRoot->GetDict("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;
    for (const auto& it : *pDest) {
      bsName = it.first;
      pDestObj = it.second;
      if (!pDestObj)
        continue;
      if (i == index)
        break;
      i++;
    }
  } else {
    pDestObj = nameTree.LookupValue(index, bsName);
  }
  if (!pDestObj)
    return nullptr;
  if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
    pDestObj = pDict->GetArray("D");
    if (!pDestObj)
      return nullptr;
  }
  if (!pDestObj->IsArray())
    return nullptr;

  CFX_WideString wsName = PDF_DecodeText(bsName);
  CFX_ByteString utf16Name = wsName.UTF16LE_Encode();
  unsigned int len = utf16Name.GetLength();
  if (!buffer) {
    *buflen = len;
  } else if (*buflen >= len) {
    memcpy(buffer, utf16Name.c_str(), len);
    *buflen = len;
  } else {
    *buflen = -1;
  }
  return (FPDF_DEST)pDestObj;
}