summaryrefslogtreecommitdiff
path: root/fpdfsdk/fpdfedittext.cpp
blob: 7bbb6a857c3ecd717e770b5459dd35b163be2ab0 (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
// 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 <algorithm>
#include <limits>
#include <map>
#include <memory>
#include <utility>
#include <vector>

#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cpdf_font.h"
#include "core/fpdfapi/font/cpdf_type1font.h"
#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/page/cpdf_textobject.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_reference.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fxcrt/fx_extension.h"
#include "core/fxge/cfx_fontmgr.h"
#include "core/fxge/fx_font.h"
#include "fpdfsdk/fsdk_define.h"
#include "public/fpdf_edit.h"

namespace {

CPDF_Dictionary* LoadFontDesc(CPDF_Document* pDoc,
                              const ByteString& font_name,
                              CFX_Font* pFont,
                              const uint8_t* data,
                              uint32_t size,
                              int font_type) {
  CPDF_Dictionary* fontDesc = pDoc->NewIndirect<CPDF_Dictionary>();
  fontDesc->SetNewFor<CPDF_Name>("Type", "FontDescriptor");
  fontDesc->SetNewFor<CPDF_Name>("FontName", font_name);
  int flags = 0;
  if (FXFT_Is_Face_fixedwidth(pFont->GetFace()))
    flags |= FXFONT_FIXED_PITCH;
  if (font_name.Contains("Serif"))
    flags |= FXFONT_SERIF;
  if (FXFT_Is_Face_Italic(pFont->GetFace()))
    flags |= FXFONT_ITALIC;
  if (FXFT_Is_Face_Bold(pFont->GetFace()))
    flags |= FXFONT_BOLD;

  // TODO(npm): How do I know if a  font is symbolic, script, allcap, smallcap
  flags |= FXFONT_NONSYMBOLIC;

  fontDesc->SetNewFor<CPDF_Number>("Flags", flags);
  FX_RECT bbox;
  pFont->GetBBox(bbox);
  auto pBBox = pdfium::MakeUnique<CPDF_Array>();
  pBBox->AddNew<CPDF_Number>(bbox.left);
  pBBox->AddNew<CPDF_Number>(bbox.top);
  pBBox->AddNew<CPDF_Number>(bbox.right);
  pBBox->AddNew<CPDF_Number>(bbox.bottom);
  fontDesc->SetFor("FontBBox", std::move(pBBox));

  // TODO(npm): calculate italic angle correctly
  fontDesc->SetNewFor<CPDF_Number>("ItalicAngle", pFont->IsItalic() ? -12 : 0);

  fontDesc->SetNewFor<CPDF_Number>("Ascent", pFont->GetAscent());
  fontDesc->SetNewFor<CPDF_Number>("Descent", pFont->GetDescent());

  // TODO(npm): calculate the capheight, stemV correctly
  fontDesc->SetNewFor<CPDF_Number>("CapHeight", pFont->GetAscent());
  fontDesc->SetNewFor<CPDF_Number>("StemV", pFont->IsBold() ? 120 : 70);

  CPDF_Stream* pStream = pDoc->NewIndirect<CPDF_Stream>();
  pStream->SetData(data, size);
  // TODO(npm): Lengths for Type1 fonts.
  if (font_type == FPDF_FONT_TRUETYPE) {
    pStream->GetDict()->SetNewFor<CPDF_Number>("Length1",
                                               static_cast<int>(size));
  }
  ByteString fontFile = font_type == FPDF_FONT_TYPE1 ? "FontFile" : "FontFile2";
  fontDesc->SetNewFor<CPDF_Reference>(fontFile, pDoc, pStream->GetObjNum());
  return fontDesc;
}

const char ToUnicodeStart[] =
    "/CIDInit /ProcSet findresource begin\n"
    "12 dict begin\n"
    "begincmap\n"
    "/CIDSystemInfo\n"
    "<</Registry (Adobe)\n"
    "/Ordering (Identity)\n"
    "/Supplement 0\n"
    ">> def\n"
    "/CMapName /Adobe-Identity-H def\n"
    "CMapType 2 def\n"
    "1 begincodespacerange\n"
    "<0000> <FFFFF>\n"
    "endcodespacerange\n";

const char ToUnicodeEnd[] =
    "endcmap\n"
    "CMapName currentdict /CMap defineresource pop\n"
    "end\n"
    "end\n";

void AddCharcode(std::ostringstream* pBuffer, uint32_t number) {
  ASSERT(number <= 0xFFFF);
  *pBuffer << "<";
  char ans[4];
  FXSYS_IntToFourHexChars(number, ans);
  for (size_t i = 0; i < 4; ++i)
    *pBuffer << ans[i];
  *pBuffer << ">";
}

// PDF spec 1.7 Section 5.9.2: "Unicode character sequences as expressed in
// UTF-16BE encoding." See https://en.wikipedia.org/wiki/UTF-16#Description
void AddUnicode(std::ostringstream* pBuffer, uint32_t unicode) {
  if (unicode >= 0xD800 && unicode <= 0xDFFF)
    unicode = 0;

  char ans[8];
  *pBuffer << "<";
  size_t numChars = FXSYS_ToUTF16BE(unicode, ans);
  for (size_t i = 0; i < numChars; ++i)
    *pBuffer << ans[i];
  *pBuffer << ">";
}

// Loads the charcode to unicode mapping into a stream
CPDF_Stream* LoadUnicode(CPDF_Document* pDoc,
                         const std::map<uint32_t, uint32_t>& to_unicode) {
  // A map charcode->unicode
  std::map<uint32_t, uint32_t> char_to_uni;
  // A map <char_start, char_end> to vector v of unicode characters of size (end
  // - start + 1). This abbreviates: start->v[0], start+1->v[1], etc. PDF spec
  // 1.7 Section 5.9.2 says that only the last byte of the unicode may change.
  std::map<std::pair<uint32_t, uint32_t>, std::vector<uint32_t>>
      map_range_vector;
  // A map <start, end> -> unicode
  // This abbreviates: start->unicode, start+1->unicode+1, etc.
  // PDF spec 1.7 Section 5.9.2 says that only the last byte of the unicode may
  // change.
  std::map<std::pair<uint32_t, uint32_t>, uint32_t> map_range;

  // Calculate the maps
  for (auto iter = to_unicode.begin(); iter != to_unicode.end(); ++iter) {
    uint32_t firstCharcode = iter->first;
    uint32_t firstUnicode = iter->second;
    if (std::next(iter) == to_unicode.end() ||
        firstCharcode + 1 != std::next(iter)->first) {
      char_to_uni[firstCharcode] = firstUnicode;
      continue;
    }
    ++iter;
    uint32_t curCharcode = iter->first;
    uint32_t curUnicode = iter->second;
    if (curCharcode % 256 == 0) {
      char_to_uni[firstCharcode] = firstUnicode;
      char_to_uni[curCharcode] = curUnicode;
      continue;
    }
    const size_t maxExtra = 255 - (curCharcode % 256);
    auto next_it = std::next(iter);
    if (firstUnicode + 1 != curUnicode) {
      // Consecutive charcodes mapping to non-consecutive unicodes
      std::vector<uint32_t> unicodes;
      unicodes.push_back(firstUnicode);
      unicodes.push_back(curUnicode);
      for (size_t i = 0; i < maxExtra; ++i) {
        if (next_it == to_unicode.end() || curCharcode + 1 != next_it->first)
          break;
        ++iter;
        ++curCharcode;
        unicodes.push_back(iter->second);
        next_it = std::next(iter);
      }
      ASSERT(iter->first - firstCharcode + 1 == unicodes.size());
      map_range_vector[std::make_pair(firstCharcode, iter->first)] = unicodes;
      continue;
    }
    // Consecutive charcodes mapping to consecutive unicodes
    for (size_t i = 0; i < maxExtra; ++i) {
      if (next_it == to_unicode.end() || curCharcode + 1 != next_it->first ||
          curUnicode + 1 != next_it->second) {
        break;
      }
      ++iter;
      ++curCharcode;
      ++curUnicode;
      next_it = std::next(iter);
    }
    map_range[std::make_pair(firstCharcode, curCharcode)] = firstUnicode;
  }
  std::ostringstream buffer;
  buffer << ToUnicodeStart;
  // Add maps to buffer
  buffer << static_cast<uint32_t>(char_to_uni.size()) << " beginbfchar\n";
  for (const auto& iter : char_to_uni) {
    AddCharcode(&buffer, iter.first);
    buffer << " ";
    AddUnicode(&buffer, iter.second);
    buffer << "\n";
  }
  buffer << "endbfchar\n"
         << static_cast<uint32_t>(map_range_vector.size() + map_range.size())
         << " beginbfrange\n";
  for (const auto& iter : map_range_vector) {
    const std::pair<uint32_t, uint32_t>& charcodeRange = iter.first;
    AddCharcode(&buffer, charcodeRange.first);
    buffer << " ";
    AddCharcode(&buffer, charcodeRange.second);
    buffer << " [";
    const std::vector<uint32_t>& unicodes = iter.second;
    for (size_t i = 0; i < unicodes.size(); ++i) {
      uint32_t uni = unicodes[i];
      AddUnicode(&buffer, uni);
      if (i != unicodes.size() - 1)
        buffer << " ";
    }
    buffer << "]\n";
  }
  for (const auto& iter : map_range) {
    const std::pair<uint32_t, uint32_t>& charcodeRange = iter.first;
    AddCharcode(&buffer, charcodeRange.first);
    buffer << " ";
    AddCharcode(&buffer, charcodeRange.second);
    buffer << " ";
    AddUnicode(&buffer, iter.second);
    buffer << "\n";
  }
  buffer << "endbfrange\n";
  buffer << ToUnicodeEnd;
  // TODO(npm): Encrypt / Compress?
  CPDF_Stream* stream = pDoc->NewIndirect<CPDF_Stream>();
  stream->SetData(&buffer);
  return stream;
}

const uint32_t kMaxSimpleFontChar = 0xFF;

void* LoadSimpleFont(CPDF_Document* pDoc,
                     std::unique_ptr<CFX_Font> pFont,
                     const uint8_t* data,
                     uint32_t size,
                     int font_type) {
  CPDF_Dictionary* fontDict = pDoc->NewIndirect<CPDF_Dictionary>();
  fontDict->SetNewFor<CPDF_Name>("Type", "Font");
  fontDict->SetNewFor<CPDF_Name>(
      "Subtype", font_type == FPDF_FONT_TYPE1 ? "Type1" : "TrueType");
  ByteString name = pFont->GetFaceName();
  if (name.IsEmpty())
    name = "Unnamed";
  fontDict->SetNewFor<CPDF_Name>("BaseFont", name);

  uint32_t glyphIndex;
  uint32_t currentChar = FXFT_Get_First_Char(pFont->GetFace(), &glyphIndex);
  if (currentChar > kMaxSimpleFontChar || glyphIndex == 0)
    return nullptr;
  fontDict->SetNewFor<CPDF_Number>("FirstChar", static_cast<int>(currentChar));
  CPDF_Array* widthsArray = pDoc->NewIndirect<CPDF_Array>();
  while (true) {
    uint32_t width =
        std::min(pFont->GetGlyphWidth(glyphIndex),
                 static_cast<uint32_t>(std::numeric_limits<int>::max()));
    widthsArray->AddNew<CPDF_Number>(static_cast<int>(width));
    uint32_t nextChar =
        FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
    // Simple fonts have 1-byte charcodes only.
    if (nextChar > kMaxSimpleFontChar || glyphIndex == 0)
      break;
    for (uint32_t i = currentChar + 1; i < nextChar; i++)
      widthsArray->AddNew<CPDF_Number>(0);
    currentChar = nextChar;
  }
  fontDict->SetNewFor<CPDF_Number>("LastChar", static_cast<int>(currentChar));
  fontDict->SetNewFor<CPDF_Reference>("Widths", pDoc, widthsArray->GetObjNum());
  CPDF_Dictionary* fontDesc =
      LoadFontDesc(pDoc, name, pFont.get(), data, size, font_type);

  fontDict->SetNewFor<CPDF_Reference>("FontDescriptor", pDoc,
                                      fontDesc->GetObjNum());
  return pDoc->LoadFont(fontDict);
}

const uint32_t kMaxUnicode = 0x10FFFF;

void* LoadCompositeFont(CPDF_Document* pDoc,
                        std::unique_ptr<CFX_Font> pFont,
                        const uint8_t* data,
                        uint32_t size,
                        int font_type) {
  CPDF_Dictionary* fontDict = pDoc->NewIndirect<CPDF_Dictionary>();
  fontDict->SetNewFor<CPDF_Name>("Type", "Font");
  fontDict->SetNewFor<CPDF_Name>("Subtype", "Type0");
  // TODO(npm): Get the correct encoding, if it's not identity.
  ByteString encoding = "Identity-H";
  fontDict->SetNewFor<CPDF_Name>("Encoding", encoding);
  ByteString name = pFont->GetFaceName();
  if (name.IsEmpty())
    name = "Unnamed";
  fontDict->SetNewFor<CPDF_Name>(
      "BaseFont", font_type == FPDF_FONT_TYPE1 ? name + "-" + encoding : name);

  CPDF_Dictionary* pCIDFont = pDoc->NewIndirect<CPDF_Dictionary>();
  pCIDFont->SetNewFor<CPDF_Name>("Type", "Font");
  pCIDFont->SetNewFor<CPDF_Name>("Subtype", font_type == FPDF_FONT_TYPE1
                                                ? "CIDFontType0"
                                                : "CIDFontType2");
  pCIDFont->SetNewFor<CPDF_Name>("BaseFont", name);

  // TODO(npm): Maybe use FT_Get_CID_Registry_Ordering_Supplement to get the
  // CIDSystemInfo
  CPDF_Dictionary* pCIDSystemInfo = pDoc->NewIndirect<CPDF_Dictionary>();
  pCIDSystemInfo->SetNewFor<CPDF_Name>("Registry", "Adobe");
  pCIDSystemInfo->SetNewFor<CPDF_Name>("Ordering", "Identity");
  pCIDSystemInfo->SetNewFor<CPDF_Number>("Supplement", 0);
  pCIDFont->SetNewFor<CPDF_Reference>("CIDSystemInfo", pDoc,
                                      pCIDSystemInfo->GetObjNum());

  CPDF_Dictionary* fontDesc =
      LoadFontDesc(pDoc, name, pFont.get(), data, size, font_type);
  pCIDFont->SetNewFor<CPDF_Reference>("FontDescriptor", pDoc,
                                      fontDesc->GetObjNum());

  uint32_t glyphIndex;
  uint32_t currentChar = FXFT_Get_First_Char(pFont->GetFace(), &glyphIndex);
  // If it doesn't have a single char, just fail
  if (glyphIndex == 0 || currentChar > kMaxUnicode)
    return nullptr;

  std::map<uint32_t, uint32_t> to_unicode;
  std::map<uint32_t, uint32_t> widths;
  while (true) {
    if (currentChar > kMaxUnicode)
      break;

    widths[glyphIndex] = pFont->GetGlyphWidth(glyphIndex);
    to_unicode[glyphIndex] = currentChar;
    currentChar =
        FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
    if (glyphIndex == 0)
      break;
  }
  CPDF_Array* widthsArray = pDoc->NewIndirect<CPDF_Array>();
  for (auto it = widths.begin(); it != widths.end(); ++it) {
    int ch = it->first;
    int w = it->second;
    if (std::next(it) == widths.end()) {
      // Only one char left, use format c [w]
      auto oneW = pdfium::MakeUnique<CPDF_Array>();
      oneW->AddNew<CPDF_Number>(w);
      widthsArray->AddNew<CPDF_Number>(ch);
      widthsArray->Add(std::move(oneW));
      break;
    }
    ++it;
    int next_ch = it->first;
    int next_w = it->second;
    if (next_ch == ch + 1 && next_w == w) {
      // The array can have a group c_first c_last w: all CIDs in the range from
      // c_first to c_last will have width w
      widthsArray->AddNew<CPDF_Number>(ch);
      ch = next_ch;
      while (true) {
        auto next_it = std::next(it);
        if (next_it == widths.end() || next_it->first != it->first + 1 ||
            next_it->second != it->second) {
          break;
        }
        ++it;
        ch = it->first;
      }
      widthsArray->AddNew<CPDF_Number>(ch);
      widthsArray->AddNew<CPDF_Number>(w);
      continue;
    }
    // Otherwise we can have a group of the form c [w1 w2 ...]: c has width
    // w1, c+1 has width w2, etc.
    widthsArray->AddNew<CPDF_Number>(ch);
    auto curWidthArray = pdfium::MakeUnique<CPDF_Array>();
    curWidthArray->AddNew<CPDF_Number>(w);
    curWidthArray->AddNew<CPDF_Number>(next_w);
    while (true) {
      auto next_it = std::next(it);
      if (next_it == widths.end() || next_it->first != it->first + 1)
        break;
      ++it;
      curWidthArray->AddNew<CPDF_Number>(static_cast<int>(it->second));
    }
    widthsArray->Add(std::move(curWidthArray));
  }
  pCIDFont->SetNewFor<CPDF_Reference>("W", pDoc, widthsArray->GetObjNum());
  // TODO(npm): Support vertical writing

  auto pDescendant = pdfium::MakeUnique<CPDF_Array>();
  pDescendant->AddNew<CPDF_Reference>(pDoc, pCIDFont->GetObjNum());
  fontDict->SetFor("DescendantFonts", std::move(pDescendant));
  CPDF_Stream* toUnicodeStream = LoadUnicode(pDoc, to_unicode);
  fontDict->SetNewFor<CPDF_Reference>("ToUnicode", pDoc,
                                      toUnicodeStream->GetObjNum());
  return pDoc->LoadFont(fontDict);
}

}  // namespace

FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
FPDFPageObj_NewTextObj(FPDF_DOCUMENT document,
                       FPDF_BYTESTRING font,
                       float font_size) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc)
    return nullptr;

  CPDF_Font* pFont = CPDF_Font::GetStockFont(pDoc, ByteStringView(font));
  if (!pFont)
    return nullptr;

  auto pTextObj = pdfium::MakeUnique<CPDF_TextObject>();
  pTextObj->m_TextState.SetFont(pFont);
  pTextObj->m_TextState.SetFontSize(font_size);
  pTextObj->DefaultStates();
  return pTextObj.release();  // Caller takes ownership.
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFText_SetText(FPDF_PAGEOBJECT text_object, FPDF_WIDESTRING text) {
  auto* pTextObj = static_cast<CPDF_TextObject*>(text_object);
  if (!pTextObj)
    return false;

  size_t len = WideString::WStringLength(text);
  WideString encodedText = WideString::FromUTF16LE(text, len);
  ByteString byteText;
  for (wchar_t wc : encodedText) {
    pTextObj->GetFont()->AppendChar(
        &byteText, pTextObj->GetFont()->CharCodeFromUnicode(wc));
  }
  pTextObj->SetText(byteText);
  return true;
}

FPDF_EXPORT FPDF_FONT FPDF_CALLCONV FPDFText_LoadFont(FPDF_DOCUMENT document,
                                                      const uint8_t* data,
                                                      uint32_t size,
                                                      int font_type,
                                                      FPDF_BOOL cid) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  if (!pDoc || !data || size == 0 ||
      (font_type != FPDF_FONT_TYPE1 && font_type != FPDF_FONT_TRUETYPE)) {
    return nullptr;
  }

  auto pFont = pdfium::MakeUnique<CFX_Font>();

  // TODO(npm): Maybe use FT_Get_X11_Font_Format to check format? Otherwise, we
  // are allowing giving any font that can be loaded on freetype and setting it
  // as any font type.
  if (!pFont->LoadEmbedded(data, size))
    return nullptr;

  return cid ? LoadCompositeFont(pDoc, std::move(pFont), data, size, font_type)
             : LoadSimpleFont(pDoc, std::move(pFont), data, size, font_type);
}

FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFText_SetFillColor(FPDF_PAGEOBJECT text_object,
                      unsigned int R,
                      unsigned int G,
                      unsigned int B,
                      unsigned int A) {
  return FPDFPageObj_SetFillColor(text_object, R, G, B, A);
}

FPDF_EXPORT void FPDF_CALLCONV FPDFFont_Close(FPDF_FONT font) {
  CPDF_Font* pFont = static_cast<CPDF_Font*>(font);
  if (!pFont)
    return;

  CPDF_Document* pDoc = pFont->GetDocument();
  if (!pDoc)
    return;

  CPDF_DocPageData* pPageData = pDoc->GetPageData();
  if (!pPageData->IsForceClear())
    pPageData->ReleaseFont(pFont->GetFontDict());
}

FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
FPDFPageObj_CreateTextObj(FPDF_DOCUMENT document,
                          FPDF_FONT font,
                          float font_size) {
  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
  CPDF_Font* pFont = static_cast<CPDF_Font*>(font);
  if (!pDoc || !pFont)
    return nullptr;

  auto pTextObj = pdfium::MakeUnique<CPDF_TextObject>();
  pTextObj->m_TextState.SetFont(pDoc->LoadFont(pFont->GetFontDict()));
  pTextObj->m_TextState.SetFontSize(font_size);
  pTextObj->DefaultStates();
  return pTextObj.release();
}