summaryrefslogtreecommitdiff
path: root/fpdfsdk/fpdf_annot.cpp
blob: 10e4d989adbcdfa37a7ad237f46e6ee1fb3f093e (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
// Copyright 2017 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.

#include "public/fpdf_annot.h"

#include <memory>
#include <utility>

#include "core/fpdfapi/edit/cpdf_pagecontentgenerator.h"
#include "core/fpdfapi/page/cpdf_form.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pageobject.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_number.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fpdfdoc/cpdf_annot.h"
#include "core/fpdfdoc/cpdf_formfield.h"
#include "core/fpdfdoc/cpdf_interform.h"
#include "core/fpdfdoc/cpvt_generateap.h"
#include "core/fxge/cfx_color.h"
#include "fpdfsdk/cpdf_annotcontext.h"
#include "fpdfsdk/cpdfsdk_helpers.h"

namespace {

// These checks ensure the consistency of annotation subtype values across core/
// and public.
static_assert(static_cast<int>(CPDF_Annot::Subtype::UNKNOWN) ==
                  FPDF_ANNOT_UNKNOWN,
              "CPDF_Annot::UNKNOWN value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::TEXT) == FPDF_ANNOT_TEXT,
              "CPDF_Annot::TEXT value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::LINK) == FPDF_ANNOT_LINK,
              "CPDF_Annot::LINK value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::FREETEXT) ==
                  FPDF_ANNOT_FREETEXT,
              "CPDF_Annot::FREETEXT value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::LINE) == FPDF_ANNOT_LINE,
              "CPDF_Annot::LINE value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::SQUARE) ==
                  FPDF_ANNOT_SQUARE,
              "CPDF_Annot::SQUARE value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::CIRCLE) ==
                  FPDF_ANNOT_CIRCLE,
              "CPDF_Annot::CIRCLE value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::POLYGON) ==
                  FPDF_ANNOT_POLYGON,
              "CPDF_Annot::POLYGON value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::POLYLINE) ==
                  FPDF_ANNOT_POLYLINE,
              "CPDF_Annot::POLYLINE value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::HIGHLIGHT) ==
                  FPDF_ANNOT_HIGHLIGHT,
              "CPDF_Annot::HIGHLIGHT value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::UNDERLINE) ==
                  FPDF_ANNOT_UNDERLINE,
              "CPDF_Annot::UNDERLINE value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::SQUIGGLY) ==
                  FPDF_ANNOT_SQUIGGLY,
              "CPDF_Annot::SQUIGGLY value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::STRIKEOUT) ==
                  FPDF_ANNOT_STRIKEOUT,
              "CPDF_Annot::STRIKEOUT value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::STAMP) == FPDF_ANNOT_STAMP,
              "CPDF_Annot::STAMP value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::CARET) == FPDF_ANNOT_CARET,
              "CPDF_Annot::CARET value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::INK) == FPDF_ANNOT_INK,
              "CPDF_Annot::INK value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::POPUP) == FPDF_ANNOT_POPUP,
              "CPDF_Annot::POPUP value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::FILEATTACHMENT) ==
                  FPDF_ANNOT_FILEATTACHMENT,
              "CPDF_Annot::FILEATTACHMENT value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::SOUND) == FPDF_ANNOT_SOUND,
              "CPDF_Annot::SOUND value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::MOVIE) == FPDF_ANNOT_MOVIE,
              "CPDF_Annot::MOVIE value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::WIDGET) ==
                  FPDF_ANNOT_WIDGET,
              "CPDF_Annot::WIDGET value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::SCREEN) ==
                  FPDF_ANNOT_SCREEN,
              "CPDF_Annot::SCREEN value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::PRINTERMARK) ==
                  FPDF_ANNOT_PRINTERMARK,
              "CPDF_Annot::PRINTERMARK value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::TRAPNET) ==
                  FPDF_ANNOT_TRAPNET,
              "CPDF_Annot::TRAPNET value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::WATERMARK) ==
                  FPDF_ANNOT_WATERMARK,
              "CPDF_Annot::WATERMARK value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::THREED) ==
                  FPDF_ANNOT_THREED,
              "CPDF_Annot::THREED value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::RICHMEDIA) ==
                  FPDF_ANNOT_RICHMEDIA,
              "CPDF_Annot::RICHMEDIA value mismatch");
static_assert(static_cast<int>(CPDF_Annot::Subtype::XFAWIDGET) ==
                  FPDF_ANNOT_XFAWIDGET,
              "CPDF_Annot::XFAWIDGET value mismatch");

// These checks ensure the consistency of annotation appearance mode values
// across core/ and public.
static_assert(static_cast<int>(CPDF_Annot::AppearanceMode::Normal) ==
                  FPDF_ANNOT_APPEARANCEMODE_NORMAL,
              "CPDF_Annot::AppearanceMode::Normal value mismatch");
static_assert(static_cast<int>(CPDF_Annot::AppearanceMode::Rollover) ==
                  FPDF_ANNOT_APPEARANCEMODE_ROLLOVER,
              "CPDF_Annot::AppearanceMode::Rollover value mismatch");
static_assert(static_cast<int>(CPDF_Annot::AppearanceMode::Down) ==
                  FPDF_ANNOT_APPEARANCEMODE_DOWN,
              "CPDF_Annot::AppearanceMode::Down value mismatch");

// These checks ensure the consistency of dictionary value types across core/
// and public/.
static_assert(static_cast<int>(CPDF_Object::Type::BOOLEAN) ==
                  FPDF_OBJECT_BOOLEAN,
              "CPDF_Object::BOOLEAN value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::NUMBER) == FPDF_OBJECT_NUMBER,
              "CPDF_Object::NUMBER value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::STRING) == FPDF_OBJECT_STRING,
              "CPDF_Object::STRING value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::NAME) == FPDF_OBJECT_NAME,
              "CPDF_Object::NAME value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::ARRAY) == FPDF_OBJECT_ARRAY,
              "CPDF_Object::ARRAY value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::DICTIONARY) ==
                  FPDF_OBJECT_DICTIONARY,
              "CPDF_Object::DICTIONARY value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::STREAM) == FPDF_OBJECT_STREAM,
              "CPDF_Object::STREAM value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::NULLOBJ) ==
                  FPDF_OBJECT_NULLOBJ,
              "CPDF_Object::NULLOBJ value mismatch");
static_assert(static_cast<int>(CPDF_Object::Type::REFERENCE) ==
                  FPDF_OBJECT_REFERENCE,
              "CPDF_Object::REFERENCE value mismatch");

bool HasAPStream(CPDF_Dictionary* pAnnotDict) {
  return !!GetAnnotAP(pAnnotDict, CPDF_Annot::AppearanceMode::Normal);
}

void UpdateContentStream(CPDF_Form* pForm, CPDF_Stream* pStream) {
  ASSERT(pForm);
  ASSERT(pStream);

  CPDF_PageContentGenerator generator(pForm);
  std::ostringstream buf;
  generator.ProcessPageObjects(&buf);
  pStream->SetDataFromStringstreamAndRemoveFilter(&buf);
}

void SetQuadPointsAtIndex(CPDF_Array* array,
                          size_t quad_index,
                          const FS_QUADPOINTSF* quad_points) {
  ASSERT(array);
  ASSERT(quad_points);
  ASSERT(IsValidQuadPointsIndex(array, quad_index));

  size_t nIndex = quad_index * 8;
  array->SetNewAt<CPDF_Number>(nIndex, quad_points->x1);
  array->SetNewAt<CPDF_Number>(++nIndex, quad_points->y1);
  array->SetNewAt<CPDF_Number>(++nIndex, quad_points->x2);
  array->SetNewAt<CPDF_Number>(++nIndex, quad_points->y2);
  array->SetNewAt<CPDF_Number>(++nIndex, quad_points->x3);
  array->SetNewAt<CPDF_Number>(++nIndex, quad_points->y3);
  array->SetNewAt<CPDF_Number>(++nIndex, quad_points->x4);
  array->SetNewAt<CPDF_Number>(++nIndex, quad_points->y4);
}

void AppendQuadPoints(CPDF_Array* array, const FS_QUADPOINTSF* quad_points) {
  ASSERT(quad_points);
  ASSERT(array);

  array->AddNew<CPDF_Number>(quad_points->x1);
  array->AddNew<CPDF_Number>(quad_points->y1);
  array->AddNew<CPDF_Number>(quad_points->x2);
  array->AddNew<CPDF_Number>(quad_points->y2);
  array->AddNew<CPDF_Number>(quad_points->x3);
  array->AddNew<CPDF_Number>(quad_points->y3);
  array->AddNew<CPDF_Number>(quad_points->x4);
  array->AddNew<CPDF_Number>(quad_points->y4);
}

void UpdateBBox(CPDF_Dictionary* annot_dict) {
  // Update BBox entry in appearance stream based on the bounding rectangle
  // of the annotation's quadpoints.
  CPDF_Stream* pStream =
      GetAnnotAP(annot_dict, CPDF_Annot::AppearanceMode::Normal);
  if (pStream) {
    CFX_FloatRect boundingRect =
        CPDF_Annot::BoundingRectFromQuadPoints(annot_dict);
    if (boundingRect.Contains(pStream->GetDict()->GetRectFor("BBox")))
      pStream->GetDict()->SetRectFor("BBox", boundingRect);
  }
}

}  // namespace

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_IsSupportedSubtype(FPDF_ANNOTATION_SUBTYPE subtype) {
  // The supported subtypes must also be communicated in the user doc.
  return subtype == FPDF_ANNOT_CIRCLE || subtype == FPDF_ANNOT_FREETEXT ||
         subtype == FPDF_ANNOT_HIGHLIGHT || subtype == FPDF_ANNOT_INK ||
         subtype == FPDF_ANNOT_POPUP || subtype == FPDF_ANNOT_SQUARE ||
         subtype == FPDF_ANNOT_SQUIGGLY || subtype == FPDF_ANNOT_STAMP ||
         subtype == FPDF_ANNOT_STRIKEOUT || subtype == FPDF_ANNOT_TEXT ||
         subtype == FPDF_ANNOT_UNDERLINE;
}

FPDF_EXPORT FPDF_ANNOTATION FPDF_CALLCONV
FPDFPage_CreateAnnot(FPDF_PAGE page, FPDF_ANNOTATION_SUBTYPE subtype) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage || !FPDFAnnot_IsSupportedSubtype(subtype))
    return nullptr;

  auto pDict = pdfium::MakeUnique<CPDF_Dictionary>(
      pPage->GetDocument()->GetByteStringPool());
  pDict->SetNewFor<CPDF_Name>("Type", "Annot");
  pDict->SetNewFor<CPDF_Name>("Subtype",
                              CPDF_Annot::AnnotSubtypeToString(
                                  static_cast<CPDF_Annot::Subtype>(subtype)));
  auto pNewAnnot =
      pdfium::MakeUnique<CPDF_AnnotContext>(pDict.get(), pPage, nullptr);

  CPDF_Array* pAnnotList = pPage->GetDict()->GetArrayFor("Annots");
  if (!pAnnotList)
    pAnnotList = pPage->GetDict()->SetNewFor<CPDF_Array>("Annots");
  pAnnotList->Add(std::move(pDict));

  // Caller takes ownership.
  return FPDFAnnotationFromCPDFAnnotContext(pNewAnnot.release());
}

FPDF_EXPORT int FPDF_CALLCONV FPDFPage_GetAnnotCount(FPDF_PAGE page) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage || !pPage->GetDict())
    return 0;

  CPDF_Array* pAnnots = pPage->GetDict()->GetArrayFor("Annots");
  return pAnnots ? pAnnots->GetCount() : 0;
}

FPDF_EXPORT FPDF_ANNOTATION FPDF_CALLCONV FPDFPage_GetAnnot(FPDF_PAGE page,
                                                            int index) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage || !pPage->GetDict() || index < 0)
    return nullptr;

  CPDF_Array* pAnnots = pPage->GetDict()->GetArrayFor("Annots");
  if (!pAnnots || static_cast<size_t>(index) >= pAnnots->GetCount())
    return nullptr;

  CPDF_Dictionary* pDict = ToDictionary(pAnnots->GetDirectObjectAt(index));
  auto pNewAnnot = pdfium::MakeUnique<CPDF_AnnotContext>(pDict, pPage, nullptr);

  // Caller takes ownership.
  return FPDFAnnotationFromCPDFAnnotContext(pNewAnnot.release());
}

FPDF_EXPORT int FPDF_CALLCONV FPDFPage_GetAnnotIndex(FPDF_PAGE page,
                                                     FPDF_ANNOTATION annot) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  CPDF_AnnotContext* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  if (!pPage || !pPage->GetDict() || !pAnnot || !pAnnot->GetAnnotDict())
    return -1;

  CPDF_Array* pAnnots = pPage->GetDict()->GetArrayFor("Annots");
  if (!pAnnots)
    return -1;

  CPDF_Dictionary* pDict = pAnnot->GetAnnotDict();
  auto it =
      std::find_if(pAnnots->begin(), pAnnots->end(),
                   [pDict](const std::unique_ptr<CPDF_Object>& candidate) {
                     return candidate->GetDirect() == pDict;
                   });

  if (it == pAnnots->end())
    return -1;

  return it - pAnnots->begin();
}

FPDF_EXPORT void FPDF_CALLCONV FPDFPage_CloseAnnot(FPDF_ANNOTATION annot) {
  delete CPDFAnnotContextFromFPDFAnnotation(annot);
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFPage_RemoveAnnot(FPDF_PAGE page,
                                                         int index) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage || !pPage->GetDict() || index < 0)
    return false;

  CPDF_Array* pAnnots = pPage->GetDict()->GetArrayFor("Annots");
  if (!pAnnots || static_cast<size_t>(index) >= pAnnots->GetCount())
    return false;

  pAnnots->RemoveAt(index);
  return true;
}

FPDF_EXPORT FPDF_ANNOTATION_SUBTYPE FPDF_CALLCONV
FPDFAnnot_GetSubtype(FPDF_ANNOTATION annot) {
  if (!annot)
    return FPDF_ANNOT_UNKNOWN;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return FPDF_ANNOT_UNKNOWN;

  return static_cast<FPDF_ANNOTATION_SUBTYPE>(
      CPDF_Annot::StringToAnnotSubtype(pAnnotDict->GetStringFor("Subtype")));
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_IsObjectSupportedSubtype(FPDF_ANNOTATION_SUBTYPE subtype) {
  // The supported subtypes must also be communicated in the user doc.
  return subtype == FPDF_ANNOT_INK || subtype == FPDF_ANNOT_STAMP;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_UpdateObject(FPDF_ANNOTATION annot, FPDF_PAGEOBJECT obj) {
  CPDF_AnnotContext* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  CPDF_PageObject* pObj = CPDFPageObjectFromFPDFPageObject(obj);
  if (!pAnnot || !pAnnot->GetAnnotDict() || !pAnnot->HasForm() || !pObj)
    return false;

  // Check that the annotation type is supported by this method.
  if (!FPDFAnnot_IsObjectSupportedSubtype(FPDFAnnot_GetSubtype(annot)))
    return false;

  // Check that the annotation already has an appearance stream, since an
  // existing object is to be updated.
  CPDF_Stream* pStream =
      GetAnnotAP(pAnnot->GetAnnotDict(), CPDF_Annot::AppearanceMode::Normal);
  if (!pStream)
    return false;

  // Check that the object is already in this annotation's object list.
  CPDF_Form* pForm = pAnnot->GetForm();
  const CPDF_PageObjectList* pObjList = pForm->GetPageObjectList();
  auto it =
      std::find_if(pObjList->begin(), pObjList->end(),
                   [pObj](const std::unique_ptr<CPDF_PageObject>& candidate) {
                     return candidate.get() == pObj;
                   });
  if (it == pObjList->end())
    return false;

  // Update the content stream data in the annotation's AP stream.
  UpdateContentStream(pForm, pStream);
  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_AppendObject(FPDF_ANNOTATION annot, FPDF_PAGEOBJECT obj) {
  CPDF_AnnotContext* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  CPDF_PageObject* pObj = CPDFPageObjectFromFPDFPageObject(obj);
  if (!pAnnot || !pObj)
    return false;

  CPDF_Dictionary* pAnnotDict = pAnnot->GetAnnotDict();
  CPDF_Page* pPage = pAnnot->GetPage();
  if (!pAnnotDict || !pPage)
    return false;

  // Check that the annotation type is supported by this method.
  if (!FPDFAnnot_IsObjectSupportedSubtype(FPDFAnnot_GetSubtype(annot)))
    return false;

  // If the annotation does not have an AP stream yet, generate and set it.
  CPDF_Stream* pStream =
      GetAnnotAP(pAnnot->GetAnnotDict(), CPDF_Annot::AppearanceMode::Normal);
  if (!pStream) {
    CPVT_GenerateAP::GenerateEmptyAP(pPage->GetDocument(), pAnnotDict);
    pStream = GetAnnotAP(pAnnotDict, CPDF_Annot::AppearanceMode::Normal);
    if (!pStream)
      return false;
  }

  // Get the annotation's corresponding form object for parsing its AP stream.
  if (!pAnnot->HasForm())
    pAnnot->SetForm(pStream);

  // Check that the object did not come from the same annotation. If this check
  // succeeds, then it is assumed that the object came from
  // FPDFPageObj_CreateNew{Path|Rect}() or FPDFPageObj_New{Text|Image}Obj().
  // Note that an object that came from a different annotation must not be
  // passed here, since an object cannot belong to more than one annotation.
  CPDF_Form* pForm = pAnnot->GetForm();
  const CPDF_PageObjectList* pObjList = pForm->GetPageObjectList();
  auto it =
      std::find_if(pObjList->begin(), pObjList->end(),
                   [pObj](const std::unique_ptr<CPDF_PageObject>& candidate) {
                     return candidate.get() == pObj;
                   });
  if (it != pObjList->end())
    return false;

  // Append the object to the object list.
  pForm->AppendPageObject(pdfium::WrapUnique(pObj));

  // Set the content stream data in the annotation's AP stream.
  UpdateContentStream(pForm, pStream);
  return true;
}

FPDF_EXPORT int FPDF_CALLCONV FPDFAnnot_GetObjectCount(FPDF_ANNOTATION annot) {
  CPDF_AnnotContext* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  if (!pAnnot || !pAnnot->GetAnnotDict())
    return 0;

  if (!pAnnot->HasForm()) {
    CPDF_Stream* pStream =
        GetAnnotAP(pAnnot->GetAnnotDict(), CPDF_Annot::AppearanceMode::Normal);
    if (!pStream)
      return 0;

    pAnnot->SetForm(pStream);
  }
  return pdfium::CollectionSize<int>(*pAnnot->GetForm()->GetPageObjectList());
}

FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
FPDFAnnot_GetObject(FPDF_ANNOTATION annot, int index) {
  CPDF_AnnotContext* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  if (!pAnnot || !pAnnot->GetAnnotDict() || index < 0)
    return nullptr;

  if (!pAnnot->HasForm()) {
    CPDF_Stream* pStream =
        GetAnnotAP(pAnnot->GetAnnotDict(), CPDF_Annot::AppearanceMode::Normal);
    if (!pStream)
      return nullptr;

    pAnnot->SetForm(pStream);
  }

  return FPDFPageObjectFromCPDFPageObject(
      pAnnot->GetForm()->GetPageObjectByIndex(index));
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_RemoveObject(FPDF_ANNOTATION annot, int index) {
  CPDF_AnnotContext* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  if (!pAnnot || !pAnnot->GetAnnotDict() || !pAnnot->HasForm() || index < 0)
    return false;

  // Check that the annotation type is supported by this method.
  if (!FPDFAnnot_IsObjectSupportedSubtype(FPDFAnnot_GetSubtype(annot)))
    return false;

  // Check that the annotation already has an appearance stream, since an
  // existing object is to be deleted.
  CPDF_Stream* pStream =
      GetAnnotAP(pAnnot->GetAnnotDict(), CPDF_Annot::AppearanceMode::Normal);
  if (!pStream)
    return false;

  if (!pAnnot->GetForm()->ErasePageObjectAtIndex(index))
    return false;

  UpdateContentStream(pAnnot->GetForm(), pStream);
  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFAnnot_SetColor(FPDF_ANNOTATION annot,
                                                       FPDFANNOT_COLORTYPE type,
                                                       unsigned int R,
                                                       unsigned int G,
                                                       unsigned int B,
                                                       unsigned int A) {
  if (!annot || R > 255 || G > 255 || B > 255 || A > 255)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  // For annotations with their appearance streams already defined, the path
  // stream's own color definitions take priority over the annotation color
  // definitions set by this method, hence this method will simply fail.
  if (HasAPStream(pAnnotDict))
    return false;

  // Set the opacity of the annotation.
  pAnnotDict->SetNewFor<CPDF_Number>("CA", A / 255.f);

  // Set the color of the annotation.
  ByteString key = type == FPDFANNOT_COLORTYPE_InteriorColor ? "IC" : "C";
  CPDF_Array* pColor = pAnnotDict->GetArrayFor(key);
  if (pColor)
    pColor->Clear();
  else
    pColor = pAnnotDict->SetNewFor<CPDF_Array>(key);

  pColor->AddNew<CPDF_Number>(R / 255.f);
  pColor->AddNew<CPDF_Number>(G / 255.f);
  pColor->AddNew<CPDF_Number>(B / 255.f);

  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFAnnot_GetColor(FPDF_ANNOTATION annot,
                                                       FPDFANNOT_COLORTYPE type,
                                                       unsigned int* R,
                                                       unsigned int* G,
                                                       unsigned int* B,
                                                       unsigned int* A) {
  if (!annot || !R || !G || !B || !A)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  // For annotations with their appearance streams already defined, the path
  // stream's own color definitions take priority over the annotation color
  // definitions retrieved by this method, hence this method will simply fail.
  if (HasAPStream(pAnnotDict))
    return false;

  CPDF_Array* pColor = pAnnotDict->GetArrayFor(
      type == FPDFANNOT_COLORTYPE_InteriorColor ? "IC" : "C");
  *A =
      (pAnnotDict->KeyExist("CA") ? pAnnotDict->GetNumberFor("CA") : 1) * 255.f;
  if (!pColor) {
    // Use default color. The default colors must be consistent with the ones
    // used to generate AP. See calls to GetColorStringWithDefault() in
    // CPVT_GenerateAP::Generate*AP().
    if (pAnnotDict->GetStringFor("Subtype") == "Highlight") {
      *R = 255;
      *G = 255;
      *B = 0;
    } else {
      *R = 0;
      *G = 0;
      *B = 0;
    }
    return true;
  }

  CFX_Color color = CFX_Color::ParseColor(*pColor);
  switch (color.nColorType) {
    case CFX_Color::kRGB:
      *R = color.fColor1 * 255.f;
      *G = color.fColor2 * 255.f;
      *B = color.fColor3 * 255.f;
      break;
    case CFX_Color::kGray:
      *R = 255.f * color.fColor1;
      *G = 255.f * color.fColor1;
      *B = 255.f * color.fColor1;
      break;
    case CFX_Color::kCMYK:
      *R = 255.f * (1 - color.fColor1) * (1 - color.fColor4);
      *G = 255.f * (1 - color.fColor2) * (1 - color.fColor4);
      *B = 255.f * (1 - color.fColor3) * (1 - color.fColor4);
      break;
    case CFX_Color::kTransparent:
      *R = 0;
      *G = 0;
      *B = 0;
      break;
  }
  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_HasAttachmentPoints(FPDF_ANNOTATION annot) {
  if (!annot)
    return false;

  FPDF_ANNOTATION_SUBTYPE subtype = FPDFAnnot_GetSubtype(annot);
  return subtype == FPDF_ANNOT_LINK || subtype == FPDF_ANNOT_HIGHLIGHT ||
         subtype == FPDF_ANNOT_UNDERLINE || subtype == FPDF_ANNOT_SQUIGGLY ||
         subtype == FPDF_ANNOT_STRIKEOUT;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_SetAttachmentPoints(FPDF_ANNOTATION annot,
                              size_t quad_index,
                              const FS_QUADPOINTSF* quad_points) {
  if (!FPDFAnnot_HasAttachmentPoints(annot) || !quad_points)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  CPDF_Array* pQuadPointsArray = GetQuadPointsArrayFromDictionary(pAnnotDict);
  if (!IsValidQuadPointsIndex(pQuadPointsArray, quad_index))
    return false;

  SetQuadPointsAtIndex(pQuadPointsArray, quad_index, quad_points);
  UpdateBBox(pAnnotDict);
  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_AppendAttachmentPoints(FPDF_ANNOTATION annot,
                                 const FS_QUADPOINTSF* quad_points) {
  if (!FPDFAnnot_HasAttachmentPoints(annot) || !quad_points)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  CPDF_Array* pQuadPointsArray = GetQuadPointsArrayFromDictionary(pAnnotDict);
  if (!pQuadPointsArray)
    pQuadPointsArray = AddQuadPointsArrayToDictionary(pAnnotDict);
  AppendQuadPoints(pQuadPointsArray, quad_points);
  UpdateBBox(pAnnotDict);
  return true;
}

FPDF_EXPORT size_t FPDF_CALLCONV
FPDFAnnot_CountAttachmentPoints(FPDF_ANNOTATION annot) {
  if (!FPDFAnnot_HasAttachmentPoints(annot))
    return 0;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  const CPDF_Array* pArray = GetQuadPointsArrayFromDictionary(pAnnotDict);
  return pArray ? pArray->GetCount() / 8 : 0;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_GetAttachmentPoints(FPDF_ANNOTATION annot,
                              size_t quad_index,
                              FS_QUADPOINTSF* quad_points) {
  if (!FPDFAnnot_HasAttachmentPoints(annot) || !quad_points)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  const CPDF_Array* pArray = GetQuadPointsArrayFromDictionary(pAnnotDict);
  if (!pArray)
    return false;

  return GetQuadPointsAtIndex(pArray, quad_index, quad_points);
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFAnnot_SetRect(FPDF_ANNOTATION annot,
                                                      const FS_RECTF* rect) {
  if (!annot || !rect)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  CFX_FloatRect newRect = CFXFloatRectFromFSRECTF(*rect);

  // Update the "Rect" entry in the annotation dictionary.
  pAnnotDict->SetRectFor("Rect", newRect);

  // If the annotation's appearance stream is defined, the annotation is of a
  // type that does not have quadpoints, and the new rectangle is bigger than
  // the current bounding box, then update the "BBox" entry in the AP
  // dictionary too, since its "BBox" entry comes from annotation dictionary's
  // "Rect" entry.
  if (FPDFAnnot_HasAttachmentPoints(annot))
    return true;

  CPDF_Stream* pStream =
      GetAnnotAP(pAnnotDict, CPDF_Annot::AppearanceMode::Normal);
  if (pStream && newRect.Contains(pStream->GetDict()->GetRectFor("BBox")))
    pStream->GetDict()->SetRectFor("BBox", newRect);
  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFAnnot_GetRect(FPDF_ANNOTATION annot,
                                                      FS_RECTF* rect) {
  if (!annot || !rect)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  FSRECTFFromCFXFloatRect(pAnnotDict->GetRectFor("Rect"), rect);
  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFAnnot_HasKey(FPDF_ANNOTATION annot,
                                                     FPDF_BYTESTRING key) {
  if (!annot)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  return pAnnotDict->KeyExist(key);
}

FPDF_EXPORT FPDF_OBJECT_TYPE FPDF_CALLCONV
FPDFAnnot_GetValueType(FPDF_ANNOTATION annot, FPDF_BYTESTRING key) {
  if (!FPDFAnnot_HasKey(annot, key))
    return FPDF_OBJECT_UNKNOWN;

  auto* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  CPDF_Object* pObj = pAnnot->GetAnnotDict()->GetObjectFor(key);
  return pObj ? pObj->GetType() : FPDF_OBJECT_UNKNOWN;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_SetStringValue(FPDF_ANNOTATION annot,
                         FPDF_BYTESTRING key,
                         FPDF_WIDESTRING value) {
  if (!annot)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  pAnnotDict->SetNewFor<CPDF_String>(
      key, CFXByteStringFromFPDFWideString(value), false);
  return true;
}

FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDFAnnot_GetStringValue(FPDF_ANNOTATION annot,
                         FPDF_BYTESTRING key,
                         void* buffer,
                         unsigned long buflen) {
  if (!annot)
    return 0;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return 0;

  return Utf16EncodeMaybeCopyAndReturnLength(pAnnotDict->GetUnicodeTextFor(key),
                                             buffer, buflen);
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFAnnot_SetAP(FPDF_ANNOTATION annot,
                FPDF_ANNOT_APPEARANCEMODE appearanceMode,
                FPDF_WIDESTRING value) {
  if (appearanceMode < 0 || appearanceMode >= FPDF_ANNOT_APPEARANCEMODE_COUNT)
    return false;

  if (!annot)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  constexpr const char* modeKeyForMode[] = {"N", "R", "D"};
  static_assert(FX_ArraySize(modeKeyForMode) == FPDF_ANNOT_APPEARANCEMODE_COUNT,
                "length of modeKeyForMode should be equal to "
                "FPDF_ANNOT_APPEARANCEMODE_COUNT");
  const char* modeKey = modeKeyForMode[appearanceMode];

  CPDF_Dictionary* pApDict = pAnnotDict->GetDictFor("AP");

  // If value is null, we're in remove mode. Otherwise, we're in add/update
  // mode.
  if (value) {
    if (!pApDict)
      pApDict = pAnnotDict->SetNewFor<CPDF_Dictionary>("AP");

    ByteString newValue = CFXByteStringFromFPDFWideString(value);
    auto pNewApStream = pdfium::MakeUnique<CPDF_Stream>();
    pNewApStream->SetData(newValue.AsRawSpan());
    pApDict->SetFor(modeKey, std::move(pNewApStream));
  } else {
    if (pApDict) {
      if (appearanceMode == FPDF_ANNOT_APPEARANCEMODE_NORMAL)
        pAnnotDict->RemoveFor("AP");
      else
        pApDict->RemoveFor(modeKey);
    }
  }

  return true;
}

FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDFAnnot_GetAP(FPDF_ANNOTATION annot,
                FPDF_ANNOT_APPEARANCEMODE appearanceMode,
                void* buffer,
                unsigned long buflen) {
  if (appearanceMode < 0 || appearanceMode >= FPDF_ANNOT_APPEARANCEMODE_COUNT)
    return 0;

  if (!annot)
    return 0;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return 0;

  CPDF_Annot::AppearanceMode mode =
      static_cast<CPDF_Annot::AppearanceMode>(appearanceMode);

  CPDF_Stream* pStream = GetAnnotAPNoFallback(pAnnotDict, mode);
  return Utf16EncodeMaybeCopyAndReturnLength(
      pStream ? pStream->GetUnicodeText() : L"", buffer, buflen);
}

FPDF_EXPORT FPDF_ANNOTATION FPDF_CALLCONV
FPDFAnnot_GetLinkedAnnot(FPDF_ANNOTATION annot, FPDF_BYTESTRING key) {
  CPDF_AnnotContext* pAnnot = CPDFAnnotContextFromFPDFAnnotation(annot);
  if (!pAnnot || !pAnnot->GetAnnotDict())
    return nullptr;

  CPDF_Dictionary* pLinkedDict = pAnnot->GetAnnotDict()->GetDictFor(key);
  if (!pLinkedDict || pLinkedDict->GetStringFor("Type") != "Annot")
    return nullptr;

  auto pLinkedAnnot = pdfium::MakeUnique<CPDF_AnnotContext>(
      pLinkedDict, pAnnot->GetPage(), nullptr);

  // Caller takes ownership.
  return FPDFAnnotationFromCPDFAnnotContext(pLinkedAnnot.release());
}

FPDF_EXPORT int FPDF_CALLCONV FPDFAnnot_GetFlags(FPDF_ANNOTATION annot) {
  if (!annot)
    return FPDF_ANNOT_FLAG_NONE;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  return pAnnotDict ? pAnnotDict->GetIntegerFor("F") : FPDF_ANNOT_FLAG_NONE;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFAnnot_SetFlags(FPDF_ANNOTATION annot,
                                                       int flags) {
  if (!annot)
    return false;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return false;

  pAnnotDict->SetNewFor<CPDF_Number>("F", flags);
  return true;
}

FPDF_EXPORT int FPDF_CALLCONV
FPDFAnnot_GetFormFieldFlags(FPDF_PAGE page, FPDF_ANNOTATION annot) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage || !annot)
    return FPDF_FORMFLAG_NONE;

  CPDF_Dictionary* pAnnotDict =
      CPDFAnnotContextFromFPDFAnnotation(annot)->GetAnnotDict();
  if (!pAnnotDict)
    return FPDF_FORMFLAG_NONE;

  CPDF_InterForm interform(pPage->GetDocument());
  CPDF_FormField* pFormField = interform.GetFieldByDict(pAnnotDict);
  return pFormField ? pFormField->GetFieldFlags() : FPDF_FORMFLAG_NONE;
}

FPDF_EXPORT FPDF_ANNOTATION FPDF_CALLCONV
FPDFAnnot_GetFormFieldAtPoint(FPDF_FORMHANDLE hHandle,
                              FPDF_PAGE page,
                              double page_x,
                              double page_y) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!hHandle || !pPage)
    return nullptr;

  CPDF_InterForm interform(pPage->GetDocument());
  int annot_index = -1;
  CPDF_FormControl* pFormCtrl = interform.GetControlAtPoint(
      pPage, CFX_PointF(static_cast<float>(page_x), static_cast<float>(page_y)),
      &annot_index);
  if (!pFormCtrl || annot_index == -1)
    return nullptr;
  return FPDFPage_GetAnnot(page, annot_index);
}