summaryrefslogtreecommitdiff
path: root/fpdfsdk/fpdf_editpage.cpp
blob: 3f1098c3710f35920bb1a5406b4f2dc342f64fe8 (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
// 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/fpdf_edit.h"

#include <algorithm>
#include <memory>
#include <utility>
#include <vector>

#include "core/fpdfapi/edit/cpdf_pagecontentgenerator.h"
#include "core/fpdfapi/page/cpdf_form.h"
#include "core/fpdfapi/page/cpdf_formobject.h"
#include "core/fpdfapi/page/cpdf_imageobject.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/page/cpdf_pathobject.h"
#include "core/fpdfapi/page/cpdf_shadingobject.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_document.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_annotlist.h"
#include "fpdfsdk/cpdfsdk_helpers.h"
#include "public/fpdf_formfill.h"
#include "third_party/base/logging.h"
#include "third_party/base/stl_util.h"

#ifdef PDF_ENABLE_XFA
#include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
#include "fpdfsdk/fpdfxfa/cpdfxfa_page.h"
#endif  // PDF_ENABLE_XFA

#if _FX_OS_ == _FX_OS_ANDROID_
#include <time.h>
#else
#include <ctime>
#endif

namespace {

static_assert(FPDF_PAGEOBJ_TEXT == CPDF_PageObject::TEXT,
              "FPDF_PAGEOBJ_TEXT/CPDF_PageObject::TEXT mismatch");
static_assert(FPDF_PAGEOBJ_PATH == CPDF_PageObject::PATH,
              "FPDF_PAGEOBJ_PATH/CPDF_PageObject::PATH mismatch");
static_assert(FPDF_PAGEOBJ_IMAGE == CPDF_PageObject::IMAGE,
              "FPDF_PAGEOBJ_IMAGE/CPDF_PageObject::IMAGE mismatch");
static_assert(FPDF_PAGEOBJ_SHADING == CPDF_PageObject::SHADING,
              "FPDF_PAGEOBJ_SHADING/CPDF_PageObject::SHADING mismatch");
static_assert(FPDF_PAGEOBJ_FORM == CPDF_PageObject::FORM,
              "FPDF_PAGEOBJ_FORM/CPDF_PageObject::FORM mismatch");

bool IsPageObject(CPDF_Page* pPage) {
  if (!pPage || !pPage->m_pFormDict || !pPage->m_pFormDict->KeyExist("Type"))
    return false;

  CPDF_Object* pObject = pPage->m_pFormDict->GetObjectFor("Type")->GetDirect();
  return pObject && !pObject->GetString().Compare("Page");
}

void CalcBoundingBox(CPDF_PageObject* pPageObj) {
  switch (pPageObj->GetType()) {
    case CPDF_PageObject::TEXT: {
      break;
    }
    case CPDF_PageObject::PATH: {
      CPDF_PathObject* pPathObj = pPageObj->AsPath();
      pPathObj->CalcBoundingBox();
      break;
    }
    case CPDF_PageObject::IMAGE: {
      CPDF_ImageObject* pImageObj = pPageObj->AsImage();
      pImageObj->CalcBoundingBox();
      break;
    }
    case CPDF_PageObject::SHADING: {
      CPDF_ShadingObject* pShadingObj = pPageObj->AsShading();
      pShadingObj->CalcBoundingBox();
      break;
    }
    case CPDF_PageObject::FORM: {
      CPDF_FormObject* pFormObj = pPageObj->AsForm();
      pFormObj->CalcBoundingBox();
      break;
    }
    default: {
      NOTREACHED();
      break;
    }
  }
}

const std::pair<const ByteString, std::unique_ptr<CPDF_Object>>*
GetMarkParamPairAtIndex(FPDF_PAGEOBJECTMARK mark, unsigned long index) {
  if (!mark)
    return nullptr;

  const CPDF_ContentMarkItem* pMarkItem =
      CPDFContentMarkItemFromFPDFPageObjectMark(mark);

  const CPDF_Dictionary* pParams = pMarkItem->GetParam();
  if (!pParams)
    return nullptr;

  for (auto& it : *pParams) {
    if (index == 0)
      return &it;

    --index;
  }

  return nullptr;
}

}  // namespace

FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV FPDF_CreateNewDocument() {
  auto pDoc = pdfium::MakeUnique<CPDF_Document>(nullptr);
  pDoc->CreateNewDoc();

  time_t currentTime;
  ByteString DateStr;
  if (FSDK_IsSandBoxPolicyEnabled(FPDF_POLICY_MACHINETIME_ACCESS)) {
    if (time(&currentTime) != -1) {
      tm* pTM = localtime(&currentTime);
      if (pTM) {
        DateStr = ByteString::Format(
            "D:%04d%02d%02d%02d%02d%02d", pTM->tm_year + 1900, pTM->tm_mon + 1,
            pTM->tm_mday, pTM->tm_hour, pTM->tm_min, pTM->tm_sec);
      }
    }
  }

  CPDF_Dictionary* pInfoDict = pDoc->GetInfo();
  if (pInfoDict) {
    if (FSDK_IsSandBoxPolicyEnabled(FPDF_POLICY_MACHINETIME_ACCESS))
      pInfoDict->SetNewFor<CPDF_String>("CreationDate", DateStr, false);
    pInfoDict->SetNewFor<CPDF_String>("Creator", L"PDFium");
  }

  // Caller takes ownership of pDoc.
  return FPDFDocumentFromCPDFDocument(pDoc.release());
}

FPDF_EXPORT void FPDF_CALLCONV FPDFPage_Delete(FPDF_DOCUMENT document,
                                               int page_index) {
  auto* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return;

  CPDF_Document::Extension* pExtension = pDoc->GetExtension();
  if (pExtension) {
    pExtension->DeletePage(page_index);
    return;
  }

  pDoc->DeletePage(page_index);
}

FPDF_EXPORT FPDF_PAGE FPDF_CALLCONV FPDFPage_New(FPDF_DOCUMENT document,
                                                 int page_index,
                                                 double width,
                                                 double height) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return nullptr;

  page_index = pdfium::clamp(page_index, 0, pDoc->GetPageCount());
  CPDF_Dictionary* pPageDict = pDoc->CreateNewPage(page_index);
  if (!pPageDict)
    return nullptr;

  pPageDict->SetRectFor("MediaBox", CFX_FloatRect(0, 0, width, height));
  pPageDict->SetNewFor<CPDF_Number>("Rotate", 0);
  pPageDict->SetNewFor<CPDF_Dictionary>("Resources");

#ifdef PDF_ENABLE_XFA
  auto* pContext = static_cast<CPDFXFA_Context*>(pDoc->GetExtension());
  if (pContext) {
    auto pXFAPage = pdfium::MakeRetain<CPDFXFA_Page>(pContext, page_index);
    return FPDFPageFromUnderlying(pXFAPage.Leak());  // Caller takes ownership.
  }
  // Eventually, fallthru into non-XFA case once page type is consistent.
  return nullptr;
#else  // PDF_ENABLE_XFA
  auto pPage = pdfium::MakeUnique<CPDF_Page>(pDoc, pPageDict, true);
  pPage->ParseContent();
  return FPDFPageFromUnderlying(pPage.release());  // Caller takes ownership.
#endif  // PDF_ENABLE_XFA
}

FPDF_EXPORT int FPDF_CALLCONV FPDFPage_GetRotation(FPDF_PAGE page) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  return IsPageObject(pPage) ? pPage->GetPageRotation() : -1;
}

FPDF_EXPORT void FPDF_CALLCONV FPDFPage_InsertObject(FPDF_PAGE page,
                                                     FPDF_PAGEOBJECT page_obj) {
  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(page_obj);
  if (!pPageObj)
    return;

  std::unique_ptr<CPDF_PageObject> pPageObjHolder(pPageObj);
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!IsPageObject(pPage))
    return;
  pPageObj->SetDirty(true);

  pPage->AppendPageObject(std::move(pPageObjHolder));
  CalcBoundingBox(pPageObj);
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFPage_RemoveObject(FPDF_PAGE page, FPDF_PAGEOBJECT page_obj) {
  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(page_obj);
  if (!pPageObj)
    return false;

  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!IsPageObject(pPage))
    return false;

  return pPage->RemovePageObject(pPageObj);
}

FPDF_EXPORT int FPDF_CALLCONV FPDFPage_CountObject(FPDF_PAGE page) {
  return FPDFPage_CountObjects(page);
}

FPDF_EXPORT int FPDF_CALLCONV FPDFPage_CountObjects(FPDF_PAGE page) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!IsPageObject(pPage))
    return -1;

  return pPage->GetPageObjectCount();
}

FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV FPDFPage_GetObject(FPDF_PAGE page,
                                                             int index) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!IsPageObject(pPage))
    return nullptr;

  return FPDFPageObjectFromCPDFPageObject(pPage->GetPageObjectByIndex(index));
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFPage_HasTransparency(FPDF_PAGE page) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  return pPage && pPage->BackgroundAlphaNeeded();
}

FPDF_EXPORT void FPDF_CALLCONV FPDFPageObj_Destroy(FPDF_PAGEOBJECT page_obj) {
  delete CPDFPageObjectFromFPDFPageObject(page_obj);
}

FPDF_EXPORT int FPDF_CALLCONV
FPDFPageObj_CountMarks(FPDF_PAGEOBJECT page_object) {
  if (!page_object)
    return -1;

  const auto& mark =
      CPDFPageObjectFromFPDFPageObject(page_object)->m_ContentMark;
  return mark.HasRef() ? mark.CountItems() : 0;
}

FPDF_EXPORT FPDF_PAGEOBJECTMARK FPDF_CALLCONV
FPDFPageObj_GetMark(FPDF_PAGEOBJECT page_object, unsigned long index) {
  if (!page_object)
    return nullptr;

  auto* mark = &CPDFPageObjectFromFPDFPageObject(page_object)->m_ContentMark;
  if (!mark->HasRef())
    return nullptr;

  if (index >= mark->CountItems())
    return nullptr;

  return FPDFPageObjectMarkFromCPDFContentMarkItem(&mark->GetItem(index));
}

FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDFPageObjMark_GetName(FPDF_PAGEOBJECTMARK mark,
                        void* buffer,
                        unsigned long buflen) {
  if (!mark)
    return 0;

  const CPDF_ContentMarkItem* pMarkItem =
      CPDFContentMarkItemFromFPDFPageObjectMark(mark);

  return Utf16EncodeMaybeCopyAndReturnLength(
      WideString::FromUTF8(pMarkItem->GetName().AsStringView()), buffer,
      buflen);
}

FPDF_EXPORT int FPDF_CALLCONV
FPDFPageObjMark_CountParams(FPDF_PAGEOBJECTMARK mark) {
  if (!mark)
    return -1;

  const CPDF_ContentMarkItem* pMarkItem =
      CPDFContentMarkItemFromFPDFPageObjectMark(mark);

  const CPDF_Dictionary* pParams = pMarkItem->GetParam();
  if (!pParams)
    return 0;

  return pParams->GetCount();
}

FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDFPageObjMark_GetParamKey(FPDF_PAGEOBJECTMARK mark,
                            unsigned long index,
                            void* buffer,
                            unsigned long buflen) {
  auto* param_pair = GetMarkParamPairAtIndex(mark, index);
  if (!param_pair)
    return 0;

  return Utf16EncodeMaybeCopyAndReturnLength(
      WideString::FromUTF8(param_pair->first.AsStringView()), buffer, buflen);
}

FPDF_EXPORT FPDF_OBJECT_TYPE FPDF_CALLCONV
FPDFPageObjMark_GetParamValueType(FPDF_PAGEOBJECTMARK mark,
                                  unsigned long index) {
  auto* param_pair = GetMarkParamPairAtIndex(mark, index);
  if (!param_pair)
    return FPDF_OBJECT_UNKNOWN;

  return param_pair->second->GetType();
}

FPDF_EXPORT int FPDF_CALLCONV
FPDFPageObjMark_GetParamIntValue(FPDF_PAGEOBJECTMARK mark,
                                 unsigned long index) {
  auto* param_pair = GetMarkParamPairAtIndex(mark, index);
  if (!param_pair)
    return 0;

  return param_pair->second->GetInteger();
}

FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDFPageObjMark_GetParamStringValue(FPDF_PAGEOBJECTMARK mark,
                                    unsigned long index,
                                    void* buffer,
                                    unsigned long buflen) {
  auto* param_pair = GetMarkParamPairAtIndex(mark, index);
  if (!param_pair)
    return 0;

  return Utf16EncodeMaybeCopyAndReturnLength(
      WideString::FromUTF8(param_pair->second->GetString().AsStringView()),
      buffer, buflen);
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFPageObj_HasTransparency(FPDF_PAGEOBJECT pageObject) {
  if (!pageObject)
    return false;

  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(pageObject);
  int blend_type = pPageObj->m_GeneralState.GetBlendType();
  if (blend_type != FXDIB_BLEND_NORMAL)
    return true;

  CPDF_Dictionary* pSMaskDict =
      ToDictionary(pPageObj->m_GeneralState.GetSoftMask());
  if (pSMaskDict)
    return true;

  if (pPageObj->m_GeneralState.GetFillAlpha() != 1.0f)
    return true;

  if (pPageObj->IsPath() && pPageObj->m_GeneralState.GetStrokeAlpha() != 1.0f) {
    return true;
  }

  if (pPageObj->IsForm()) {
    const CPDF_Form* pForm = pPageObj->AsForm()->form();
    if (pForm) {
      int trans = pForm->GetTransparency();
      if ((trans & PDFTRANS_ISOLATED) || (trans & PDFTRANS_GROUP))
        return true;
    }
  }

  return false;
}

FPDF_EXPORT int FPDF_CALLCONV FPDFPageObj_GetType(FPDF_PAGEOBJECT pageObject) {
  if (!pageObject)
    return FPDF_PAGEOBJ_UNKNOWN;

  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(pageObject);
  return pPageObj->GetType();
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFPage_GenerateContent(FPDF_PAGE page) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!IsPageObject(pPage))
    return false;

  CPDF_PageContentGenerator CG(pPage);
  CG.GenerateContent();
  return true;
}

FPDF_EXPORT void FPDF_CALLCONV
FPDFPageObj_Transform(FPDF_PAGEOBJECT page_object,
                      double a,
                      double b,
                      double c,
                      double d,
                      double e,
                      double f) {
  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(page_object);
  if (!pPageObj)
    return;

  CFX_Matrix matrix((float)a, (float)b, (float)c, (float)d, (float)e, (float)f);
  pPageObj->Transform(matrix);
}

FPDF_EXPORT void FPDF_CALLCONV
FPDFPageObj_SetBlendMode(FPDF_PAGEOBJECT page_object,
                         FPDF_BYTESTRING blend_mode) {
  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(page_object);
  if (!pPageObj)
    return;

  pPageObj->m_GeneralState.SetBlendMode(blend_mode);
  pPageObj->SetDirty(true);
}

FPDF_EXPORT void FPDF_CALLCONV FPDFPage_TransformAnnots(FPDF_PAGE page,
                                                        double a,
                                                        double b,
                                                        double c,
                                                        double d,
                                                        double e,
                                                        double f) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage)
    return;

  CPDF_AnnotList AnnotList(pPage);
  for (size_t i = 0; i < AnnotList.Count(); ++i) {
    CPDF_Annot* pAnnot = AnnotList.GetAt(i);
    CFX_Matrix matrix((float)a, (float)b, (float)c, (float)d, (float)e,
                      (float)f);
    CFX_FloatRect rect = matrix.TransformRect(pAnnot->GetRect());

    CPDF_Dictionary* pAnnotDict = pAnnot->GetAnnotDict();
    CPDF_Array* pRectArray = pAnnotDict->GetArrayFor("Rect");
    if (pRectArray)
      pRectArray->Clear();
    else
      pRectArray = pAnnotDict->SetNewFor<CPDF_Array>("Rect");

    pRectArray->AddNew<CPDF_Number>(rect.left);
    pRectArray->AddNew<CPDF_Number>(rect.bottom);
    pRectArray->AddNew<CPDF_Number>(rect.right);
    pRectArray->AddNew<CPDF_Number>(rect.top);

    // TODO(unknown): Transform AP's rectangle
  }
}

FPDF_EXPORT void FPDF_CALLCONV FPDFPage_SetRotation(FPDF_PAGE page,
                                                    int rotate) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!IsPageObject(pPage))
    return;

  rotate %= 4;
  pPage->m_pFormDict->SetNewFor<CPDF_Number>("Rotate", rotate * 90);
}

FPDF_BOOL FPDFPageObj_SetFillColor(FPDF_PAGEOBJECT page_object,
                                   unsigned int R,
                                   unsigned int G,
                                   unsigned int B,
                                   unsigned int A) {
  if (!page_object || R > 255 || G > 255 || B > 255 || A > 255)
    return false;

  std::vector<float> rgb = {R / 255.f, G / 255.f, B / 255.f};
  auto* pPageObj = CPDFPageObjectFromFPDFPageObject(page_object);
  pPageObj->m_GeneralState.SetFillAlpha(A / 255.f);
  pPageObj->m_ColorState.SetFillColor(
      CPDF_ColorSpace::GetStockCS(PDFCS_DEVICERGB), rgb);
  pPageObj->SetDirty(true);
  return true;
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFPageObj_GetBounds(FPDF_PAGEOBJECT pageObject,
                      float* left,
                      float* bottom,
                      float* right,
                      float* top) {
  if (!pageObject)
    return false;

  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(pageObject);
  CFX_FloatRect bbox = pPageObj->GetRect();
  *left = bbox.left;
  *bottom = bbox.bottom;
  *right = bbox.right;
  *top = bbox.top;
  return true;
}