summaryrefslogtreecommitdiffstats
path: root/kdvi/dviRenderer.cpp
blob: 46a56980c084b3510534a2be0ddc20384e29c394 (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
//
// Class: dviRenderer
//
// Class for rendering TeX DVI files.
// Part of KDVI- A previewer for TeX DVI files.
//
// (C) 2001-2005 Stefan Kebekus
// Distributed under the GPL
//

#include <config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <tqcheckbox.h>
#include <tqclipboard.h>
#include <tqcursor.h>
#include <tqlabel.h>
#include <tqfileinfo.h>
#include <tqlayout.h>
#include <tqmessagebox.h>
#include <tqpaintdevice.h>
#include <tqpainter.h>
#include <tqptrstack.h>
#include <tqregexp.h>
#include <tqurl.h>
#include <tqvbox.h>

#include <tdeapplication.h>
#include <tdemessagebox.h>
#include <kmimemagic.h>
#include <tdeglobal.h>
#include <kdebug.h>
#include <keditcl.h>
#include <tdefiledialog.h>
#include <tdeio/job.h>
#include <tdeio/netaccess.h>
#include <tdelocale.h>
#include <kprinter.h>
#include <kprocess.h>
#include <kprogress.h>
#include <kstandarddirs.h>
#include <kstdguiitem.h>

#include "documentWidget.h"
#include "dviFile.h"
#include "dviRenderer.h"
#include "fontpool.h"
#include "fontprogress.h"
#include "hyperlink.h"
#include "infodialog.h"
#include "kdvi_multipage.h"
#include "performanceMeasurement.h"
#include "prebookmark.h"
#include "psgs.h"
#include "xdvi.h"
#include "zoomlimits.h"
#include "dvisourcesplitter.h"
#include "renderedDviPagePixmap.h"

//#define DEBUG_DVIRENDERER

TQPainter *foreGroundPainter; // TQPainter used for text


//------ now comes the dviRenderer class implementation ----------

dviRenderer::dviRenderer(TQWidget *par)
  : DocumentRenderer(par), info(new infoDialog(par))
{
#ifdef DEBUG_DVIRENDERER
  kdDebug(4300) << "dviRenderer( parent=" << par << " )" << endl;
#endif

  // initialize the dvi machinery
  dviFile                = 0;

  connect(&font_pool, TQT_SIGNAL( setStatusBarText( const TQString& ) ), this, TQT_SIGNAL( setStatusBarText( const TQString& ) ) );

  parentWidget = par;
  shrinkfactor = 3;
  current_page = 0;
  resolutionInDPI = 0.0;

  connect( &clearStatusBarTimer, TQT_SIGNAL(timeout()), this, TQT_SLOT(clearStatusBar()) );

  currentlyDrawnPage = 0;
  editorCommand         = "";

  PostScriptOutPutString = NULL;
  HTML_href              = NULL;
  _postscript            = 0;

  // Storage used for dvips and friends, i.e. for the "export" functions.
  proc                   = 0;
  progress               = 0;
  export_printer         = 0;
  export_fileName        = "";
  export_tmpFileName     = "";
  export_errorString     = "";

  PS_interface           = new ghostscript_interface();
  // pass status bar messages through
  connect(PS_interface, TQT_SIGNAL( setStatusBarText( const TQString& ) ), this, TQT_SIGNAL( setStatusBarText( const TQString& ) ) );
}


dviRenderer::~dviRenderer()
{
#ifdef DEBUG_DVIRENDERER
  kdDebug(4300) << "~dviRenderer" << endl;
#endif

  mutex.lock();
  mutex.unlock();

  delete PS_interface;
  delete proc;
  delete dviFile;
  // Don't delete the export printer. This is owned by the
  // kdvi_multipage.
  export_printer = 0;
}


void dviRenderer::setPrefs(bool flag_showPS, const TQString &str_editorCommand, bool useFontHints )
{
  TQMutexLocker locker(&mutex);
  _postscript = flag_showPS;
  editorCommand = str_editorCommand;
  font_pool.setParameters( useFontHints );
  emit(documentIsChanged());
}


void dviRenderer::showInfo()
{
  mutex.lock();
  info->setDVIData(dviFile);
  info->show();
  mutex.unlock();
}


//------ this function calls the dvi interpreter ----------


void dviRenderer::drawPage(double resolution, RenderedDocumentPage *page)
{
#ifdef DEBUG_DVIRENDERER
  kdDebug(4300) << "dviRenderer::drawPage(documentPage *) called, page number " << page->getPageNumber() << endl;
#endif
  
  // Paranoid safety checks
  if (page == 0) {
    kdError(4300) << "dviRenderer::drawPage(documentPage *) called with argument == 0" << endl; 
    return;
  }
  if (page->getPageNumber() == 0) {
    kdError(4300) << "dviRenderer::drawPage(documentPage *) called for a documentPage with page number 0" << endl;
    return;
  }

  mutex.lock();
  if ( dviFile == 0 ) {
    kdError(4300) << "dviRenderer::drawPage(documentPage *) called, but no dviFile class allocated." << endl;
    page->clear();
    mutex.unlock();
    return;
  }
  if (page->getPageNumber() > dviFile->total_pages) {
    kdError(4300) << "dviRenderer::drawPage(documentPage *) called for a documentPage with page number " << page->getPageNumber() 
		  << " but the current dviFile has only " << dviFile->total_pages << " pages." << endl;
    mutex.unlock();
    return;
  }
  if ( dviFile->dvi_Data() == 0 ) {
    kdError(4300) << "dviRenderer::drawPage(documentPage *) called, but no dviFile is loaded yet." << endl;
    page->clear();
    mutex.unlock();
    return;
  }
 
  if (resolution != resolutionInDPI)
    setResolution(resolution);
  
  currentlyDrawnPage     = page;
  shrinkfactor           = 1200/resolutionInDPI;
  current_page           = page->getPageNumber()-1;
  
  
  // Reset colors
  colorStack.clear();
  globalColor = TQt::black;

  TQApplication::setOverrideCursor( waitCursor );
  foreGroundPainter = page->getPainter();
  if (foreGroundPainter != 0) {
    errorMsg = TQString();
    draw_page();
    page->returnPainter(foreGroundPainter);
  }
  TQApplication::restoreOverrideCursor();
  
  page->isEmpty = false;
  if (errorMsg.isEmpty() != true) {
    KMessageBox::detailedError(parentWidget,
			       i18n("<qt><strong>File corruption!</strong> KDVI had trouble interpreting your DVI file. Most "
				    "likely this means that the DVI file is broken.</qt>"),
			       errorMsg, i18n("DVI File Error"));
    errorMsg = TQString();
    currentlyDrawnPage = 0;
    mutex.unlock();
    return;
  }
  
  // Tell the user (once) if the DVI file contains source specials
  // ... we don't want our great feature to go unnoticed.
  RenderedDviPagePixmap* currentDVIPage = dynamic_cast<RenderedDviPagePixmap*>(currentlyDrawnPage);
  if (currentDVIPage)
  {
    if ((dviFile->sourceSpecialMarker == true) && (currentDVIPage->sourceHyperLinkList.size() > 0)) {
      dviFile->sourceSpecialMarker = false;
      // Show the dialog as soon as event processing is finished, and
      // the program is idle
      TQTimer::singleShot( 0, this, TQT_SLOT(showThatSourceInformationIsPresent()) );
    }
  }
  
  currentlyDrawnPage = 0;
  mutex.unlock();
}


void dviRenderer::getText(RenderedDocumentPage* page)
{
  bool postscriptBackup = _postscript;
  // Disable postscript-specials temporarely to speed up text extraction.
  _postscript = false;

  drawPage(100.0, page);

  _postscript = postscriptBackup;
}


void dviRenderer::showThatSourceInformationIsPresent()
{
  // In principle, we should use a KMessagebox here, but we want to
  // add a button "Explain in more detail..." which opens the
  // Helpcenter. Thus, we practically re-implement the KMessagebox
  // here. Most of the code is stolen from there.
  
  // Check if the 'Don't show again' feature was used
  TDEConfig *config = kapp->config();
  TDEConfigGroupSaver saver( config, "Notification Messages" );
  bool showMsg = config->readBoolEntry( "KDVI-info_on_source_specials", true);
  
  if (showMsg) {
    KDialogBase *dialog= new KDialogBase(i18n("KDVI: Information"), KDialogBase::Yes, KDialogBase::Yes, KDialogBase::Yes,
					 parentWidget, "information", true, true,KStdGuiItem::ok() );
    
    TQVBox *topcontents = new TQVBox (dialog);
    topcontents->setSpacing(KDialog::spacingHint()*2);
    topcontents->setMargin(KDialog::marginHint()*2);
    
    TQWidget *contents = new TQWidget(topcontents);
    TQHBoxLayout * lay = new TQHBoxLayout(contents);
    lay->setSpacing(KDialog::spacingHint()*2);
    
    lay->addStretch(1);
    TQLabel *label1 = new TQLabel( contents);
    label1->setPixmap(TQMessageBox::standardIcon(TQMessageBox::Information));
    lay->add( label1 );
    TQLabel *label2 = new TQLabel( i18n("<qt>This DVI file contains source file information. You may click into the text with the "
				      "middle mouse button, and an editor will open the TeX-source file immediately.</qt>"),
				 contents);
    label2->setMinimumSize(label2->sizeHint());
    lay->add( label2 );
    lay->addStretch(1);
    TQSize extraSize = TQSize(50,30);
    TQCheckBox *checkbox = new TQCheckBox(i18n("Do not show this message again"), topcontents);
    extraSize = TQSize(50,0);
    dialog->setHelpLinkText(i18n("Explain in more detail..."));
    dialog->setHelp("inverse-search", "kdvi");
    dialog->enableLinkedHelp(true);
    dialog->setMainWidget(topcontents);
    dialog->enableButtonSeparator(false);
    dialog->incInitialSize( extraSize );
    dialog->exec();
    delete dialog;
    
    showMsg = !checkbox->isChecked();
    if (!showMsg) {
      TDEConfigGroupSaver saver( config, "Notification Messages" );
      config->writeEntry( "KDVI-info_on_source_specials", showMsg);
    }
    config->sync();
  }
}


void dviRenderer::embedPostScript()
{
#ifdef DEBUG_DVIRENDERER
  kdDebug(4300) << "dviRenderer::embedPostScript()" << endl;
#endif

  if (!dviFile)
    return;

  embedPS_progress = new KProgressDialog(parentWidget, "embedPSProgressDialog",
					 i18n("Embedding PostScript Files"), TQString(), true);
  if (!embedPS_progress)
    return;
  embedPS_progress->setAllowCancel(false);
  embedPS_progress->showCancelButton(false);
  embedPS_progress->setMinimumDuration(400);
  embedPS_progress->progressBar()->setTotalSteps(dviFile->numberOfExternalPSFiles);
  embedPS_progress->progressBar()->setProgress(0);
  embedPS_numOfProgressedFiles = 0;


  TQ_UINT16 currPageSav = current_page;
  errorMsg = TQString();
  for(current_page=0; current_page < dviFile->total_pages; current_page++) {
    if (current_page < dviFile->total_pages) {
      command_pointer = dviFile->dvi_Data() + dviFile->page_offset[current_page];
      end_pointer     = dviFile->dvi_Data() + dviFile->page_offset[current_page+1];
    } else
      command_pointer = end_pointer = 0;

    memset((char *) &currinf.data, 0, sizeof(currinf.data));
    currinf.fonttable = &(dviFile->tn_table);
    currinf._virtual  = NULL;
    prescan(&dviRenderer::prescan_embedPS);
  }

  delete embedPS_progress;

  if (!errorMsg.isEmpty()) {
    errorMsg = "<qt>" + errorMsg + "</qt>";
    KMessageBox::detailedError(parentWidget, "<qt>" + i18n("Not all PostScript files could be embedded into your document.") + "</qt>", errorMsg);
    errorMsg = TQString();
  } else
    KMessageBox::information(parentWidget, "<qt>" + i18n("All external PostScript files were embedded into your document. You "
						 "will probably want to save the DVI file now.") + "</qt>",
			     TQString(), "embeddingDone");

  // Prescan phase starts here
#ifdef PERFORMANCE_MEASUREMENT
  kdDebug(4300) << "Time elapsed till prescan phase starts " << performanceTimer.elapsed() << "ms" << endl;
  TQTime preScanTimer;
  preScanTimer.start();
#endif
  dviFile->numberOfExternalPSFiles = 0;
  prebookmarks.clear();
  for(current_page=0; current_page < dviFile->total_pages; current_page++) {
    PostScriptOutPutString = new TQString();

    if (current_page < dviFile->total_pages) {
      command_pointer = dviFile->dvi_Data() + dviFile->page_offset[current_page];
      end_pointer     = dviFile->dvi_Data() + dviFile->page_offset[current_page+1];
    } else
      command_pointer = end_pointer = 0;

    memset((char *) &currinf.data, 0, sizeof(currinf.data));
    currinf.fonttable = &(dviFile->tn_table);
    currinf._virtual  = NULL;

    prescan(&dviRenderer::prescan_parseSpecials);

    if (!PostScriptOutPutString->isEmpty())
      PS_interface->setPostScript(current_page, *PostScriptOutPutString);
    delete PostScriptOutPutString;
  }
  PostScriptOutPutString = NULL;


#ifdef PERFORMANCE_MEASUREMENT
  kdDebug(4300) << "Time required for prescan phase: " << preScanTimer.restart() << "ms" << endl;
#endif
  current_page = currPageSav;
  _isModified = true;
}


bool dviRenderer::isValidFile(const TQString& filename) const
{
  TQFile f(filename);
  if (!f.open(IO_ReadOnly))
    return false;

  unsigned char test[4];
  if ( f.readBlock( (char *)test,2)<2 || test[0] != 247 || test[1] != 2 )
    return false;

  int n = f.size();
  if ( n < 134 )	// Too short for a dvi file
    return false;
  f.at( n-4 );

  unsigned char trailer[4] = { 0xdf,0xdf,0xdf,0xdf };

  if ( f.readBlock( (char *)test, 4 )<4 || strncmp( (char *)test, (char *) trailer, 4 ) )
    return false;
  // We suppose now that the dvi file is complete and OK
  return true;
}


bool dviRenderer::setFile(const TQString &fname, const KURL &base)
{
#ifdef DEBUG_DVIRENDERER
  kdDebug(4300) << "dviRenderer::setFile( fname='" << fname << "', ref='" << ref << "', sourceMarker=" << sourceMarker << " )" << endl;
#endif

  TQMutexLocker lock(&mutex);

  TQFileInfo fi(fname);
  TQString   filename = fi.absFilePath();

  // If fname is the empty string, then this means: "close". Delete
  // the dvifile and the pixmap.
  if (fname.isEmpty()) {
    // Delete DVI file
    info->setDVIData(0);
    delete dviFile;
    dviFile = 0;
    return true;
  }
  
  
  // Make sure the file actually exists.
  if (!fi.exists() || fi.isDir()) {
    KMessageBox::error( parentWidget,
			i18n("<qt><strong>File error.</strong> The specified file '%1' does not exist. "
			     "KDVI already tried to add the ending '.dvi'.</qt>").arg(filename),
			i18n("File Error!"));
    return false;
  }
  
  // Check if we are really loading a DVI file, and complain about the
  // mime type, if the file is not DVI. Perhaps we should move the
  // procedure later to the kviewpart, instead of the implementaton in
  // the multipage.
  TQString mimetype( KMimeMagic::self()->findFileType( fname )->mimeType() );
  if (mimetype != "application/x-dvi") {
    KMessageBox::sorry( parentWidget,
			i18n( "<qt>Could not open file <nobr><strong>%1</strong></nobr> which has "
			      "type <strong>%2</strong>. KDVI can only load DVI (.dvi) files.</qt>" )
			.arg( fname )
			.arg( mimetype ) );
    return false;
  }
  
  // Check if the file is a valid DVI file.
  if (!isValidFile(filename))
  {
    KMessageBox::sorry( parentWidget,
                        i18n("<qt>File corruption! KDVI had trouble interpreting your DVI file. Most "
                             "likely this means that the DVI file is broken.</qt>")
                        .arg( fname ) );
    return false;
  }

  TQApplication::setOverrideCursor( waitCursor );
  dvifile *dviFile_new = new dvifile(filename, &font_pool);
  
  if ((dviFile == 0) || (dviFile->filename != filename))
    dviFile_new->sourceSpecialMarker = true;
  else
    dviFile_new->sourceSpecialMarker = false;
  
  if ((dviFile_new->dvi_Data() == NULL)||(dviFile_new->errorMsg.isEmpty() != true)) {
    TQApplication::restoreOverrideCursor();
    if (dviFile_new->errorMsg.isEmpty() != true)
      KMessageBox::detailedError(parentWidget,
				 i18n("<qt>File corruption! KDVI had trouble interpreting your DVI file. Most "
				      "likely this means that the DVI file is broken.</qt>"),
				 dviFile_new->errorMsg, i18n("DVI File Error"));
    delete dviFile_new;
    return false;
  }
  
  delete dviFile;
  dviFile = dviFile_new;
  numPages = dviFile->total_pages;
  info->setDVIData(dviFile);
  _isModified = false;
  baseURL = base;
  
  font_pool.setExtraSearchPath( fi.dirPath(true) );
  font_pool.setCMperDVIunit( dviFile->getCmPerDVIunit() );
  
  // Extract PostScript from the DVI file, and store the PostScript
  // specials in PostScriptDirectory, and the headers in the
  // PostScriptHeaderString.
  PS_interface->clear();
  
  // If the DVI file comes from a remote URL (e.g. downloaded from a
  // web server), we limit the PostScript files that can be accessed
  // by this file to the download directory, in order to limit the
  // possibilities of a denial of service attack.
  TQString includePath;
  if (!baseURL.isLocalFile()) {
    includePath = filename;
    includePath.truncate(includePath.findRev('/'));
  }
  PS_interface->setIncludePath(includePath);
  
  // We will also generate a list of hyperlink-anchors and source-file
  // anchors in the document. So declare the existing lists empty.
  anchorList.clear();
  sourceHyperLinkAnchors.clear();
  bookmarks.clear();
  prebookmarks.clear();
  
  if (dviFile->page_offset.isEmpty() == true)
    return false;
  
  // Locate fonts.
  font_pool.locateFonts();
  
  // Update the list of fonts in the info window
  if (info != 0)
    info->setFontInfo(&font_pool);
  
  // We should pre-scan the document now (to extract embedded,
  // PostScript, Hyperlinks, ets).
  
  // PRESCAN STARTS HERE
#ifdef PERFORMANCE_MEASUREMENT
  kdDebug(4300) << "Time elapsed till prescan phase starts " << performanceTimer.elapsed() << "ms" << endl;
  TQTime preScanTimer;
  preScanTimer.start();
#endif
  dviFile->numberOfExternalPSFiles = 0;
  TQ_UINT16 currPageSav = current_page;
  prebookmarks.clear();
  
  for(current_page=0; current_page < dviFile->total_pages; current_page++) {
    PostScriptOutPutString = new TQString();
    
    if (current_page < dviFile->total_pages) {
      command_pointer = dviFile->dvi_Data() + dviFile->page_offset[current_page];
      end_pointer     = dviFile->dvi_Data() + dviFile->page_offset[current_page+1];
    } else
      command_pointer = end_pointer = 0;
    
    memset((char *) &currinf.data, 0, sizeof(currinf.data));
    currinf.fonttable = &(dviFile->tn_table);
    currinf._virtual  = NULL;
    prescan(&dviRenderer::prescan_parseSpecials);
    
    if (!PostScriptOutPutString->isEmpty())
      PS_interface->setPostScript(current_page, *PostScriptOutPutString);
    delete PostScriptOutPutString;
  }
  PostScriptOutPutString = NULL;
  
  // Generate the list of bookmarks
  bookmarks.clear();
  TQPtrStack<Bookmark> stack;
  stack.setAutoDelete (false);
  TQValueVector<PreBookmark>::iterator it;
  for( it = prebookmarks.begin(); it != prebookmarks.end(); ++it ) {
    Bookmark *bmk = new Bookmark((*it).title, findAnchor((*it).anchorName));
    if (stack.isEmpty())
      bookmarks.append(bmk);
    else {
      stack.top()->subordinateBookmarks.append(bmk);
      stack.remove();
    }
    for(int i=0; i<(*it).noOfChildren; i++)
      stack.push(bmk);
  }
  prebookmarks.clear();
  
  
#ifdef PERFORMANCE_MEASUREMENT
  kdDebug(4300) << "Time required for prescan phase: " << preScanTimer.restart() << "ms" << endl;
#endif
  current_page = currPageSav;
  // PRESCAN ENDS HERE
  
  
  pageSizes.resize(0);
  if (dviFile->suggestedPageSize != 0) {
    // Fill the vector pageSizes with total_pages identical entries
    pageSizes.resize(dviFile->total_pages, *(dviFile->suggestedPageSize));
  }
  
  TQApplication::restoreOverrideCursor();
  return true;
}


Anchor dviRenderer::parseReference(const TQString &reference)
{
  mutex.lock();
  
#ifdef DEBUG_DVIRENDERER
  kdError(4300) << "dviRenderer::parseReference( " << reference << " ) called" << endl;
#endif

  if (dviFile == 0) {
    mutex.unlock();
    return Anchor();
  }    

  // case 1: The reference is a number, which we'll interpret as a
  // page number.
  bool ok;
  int page = reference.toInt ( &ok );
  if (ok == true) {
    if (page < 0)
      page = 0;
    if (page > dviFile->total_pages)
      page = dviFile->total_pages;

    mutex.unlock();
    return Anchor(page, Length() );
  }
  
  // case 2: The reference is of form "src:1111Filename", where "1111"
  // points to line number 1111 in the file "Filename". KDVI then
  // looks for source specials of the form "src:xxxxFilename", and
  // tries to find the special with the biggest xxxx
  if (reference.find("src:",0,false) == 0) {
  
    // Extract the file name and the numeral part from the reference string
    DVI_SourceFileSplitter splitter(reference, dviFile->filename);
    TQ_UINT32 refLineNumber = splitter.line();
    TQString  refFileName   = splitter.filePath();
    
    if (sourceHyperLinkAnchors.isEmpty()) {
      KMessageBox::sorry(parentWidget, i18n("<qt>You have asked KDVI to locate the place in the DVI file which corresponds to "
				    "line %1 in the TeX-file <strong>%2</strong>. It seems, however, that the DVI file "
				    "does not contain the necessary source file information. "
				    "We refer to the manual of KDVI for a detailed explanation on how to include this "
				    "information. Press the F1 key to open the manual.</qt>").arg(refLineNumber).arg(refFileName),
			 i18n("Could Not Find Reference"));
      mutex.unlock();
      return Anchor();
    }

    // Go through the list of source file anchors, and find the anchor
    // whose line number is the biggest among those that are smaller
    // than the refLineNumber. That way, the position in the DVI file
    // which is highlighted is always a little further up than the
    // position in the editor, e.g. if the DVI file contains
    // positional information at the beginning of every paragraph,
    // KDVI jumps to the beginning of the paragraph that the cursor is
    // in, and never to the next paragraph. If source file anchors for
    // the refFileName can be found, but none of their line numbers is
    // smaller than the refLineNumber, the reason is most likely, that
    // the cursor in the editor stands somewhere in the preamble of
    // the LaTeX file. In that case, we jump to the beginning of the
    // document.
    bool anchorForRefFileFound = false; // Flag that is set if source file anchors for the refFileName could be found at all
    
    TQValueVector<DVI_SourceFileAnchor>::iterator bestMatch = sourceHyperLinkAnchors.end();
    TQValueVector<DVI_SourceFileAnchor>::iterator it;
    for( it = sourceHyperLinkAnchors.begin(); it != sourceHyperLinkAnchors.end(); ++it )
      if (refFileName.stripWhiteSpace() == it->fileName.stripWhiteSpace()
      || refFileName.stripWhiteSpace() == it->fileName.stripWhiteSpace() + ".tex"
      ) {
	anchorForRefFileFound = true;
	
	if ( (it->line <= refLineNumber) &&
	     ( (bestMatch == sourceHyperLinkAnchors.end()) || (it->line > bestMatch->line) ) )
	  bestMatch = it;
      }
    
    if (bestMatch != sourceHyperLinkAnchors.end()) {
      mutex.unlock();
      return Anchor(bestMatch->page, bestMatch->distance_from_top);
    } else
      if (anchorForRefFileFound == false)
	KMessageBox::sorry(parentWidget, i18n("<qt>KDVI was not able to locate the place in the DVI file which corresponds to "
					      "line %1 in the TeX-file <strong>%2</strong>.</qt>").arg(refLineNumber).arg(refFileName),
			   i18n( "Could Not Find Reference" ));
      else {
	mutex.unlock();
	return Anchor();
      }
    mutex.unlock();
    return Anchor();
  }
  mutex.unlock();
  return Anchor();
}


void dviRenderer::setResolution(double resolution_in_DPI)
{
  // Ignore minute changes. The difference to the current value would
  // hardly be visible anyway. That saves a lot of re-painting,
  // e.g. when the user resizes the window, and a flickery mouse
  // changes the window size by 1 pixel all the time.
  if (fabs(resolutionInDPI-resolution_in_DPI) < 1)
    return;

  resolutionInDPI = resolution_in_DPI;
  
  // Pass the information on to the font pool. 
  font_pool.setDisplayResolution( resolutionInDPI );
  shrinkfactor = 1200/resolutionInDPI;
  return;
}


void dviRenderer::clearStatusBar()
{
  emit setStatusBarText( TQString() );
}


void dviRenderer::handleSRCLink(const TQString &linkText, TQMouseEvent *e, DocumentWidget *win)
{
#ifdef DEBUG_SPECIAL
  RenderedDviPagePixmap* currentDVIPage = dynamic_cast<RenderedDviPagePixmap*> currentlyDrawnPage;
  if (currentDVIPage)
  {
    kdDebug(4300) << "Source hyperlink to " << currentDVIPage->sourceHyperLinkList[i].linkText << endl;
  }
#endif

  DVI_SourceFileSplitter splitter(linkText, dviFile->filename);
  TQString TeXfile = splitter.filePath();
  if ( ! splitter.fileExists() )
  {
      KMessageBox::sorry(parentWidget, TQString("<qt>") +
			 i18n("The DVI-file refers to the TeX-file "
			      "<strong>%1</strong> which could not be found.").arg(KShellProcess::quote(TeXfile)) +
			 TQString("</qt>"),
			 i18n( "Could Not Find File" ));
      return;
  }
  
  TQString command = editorCommand;
  if (command.isEmpty() == true) {
    int r = KMessageBox::warningContinueCancel(parentWidget, TQString("<qt>") +
					       i18n("You have not yet specified an editor for inverse search. "
						    "Please choose your favorite editor in the "
						    "<strong>DVI options dialog</strong> "
						    "which you will find in the <strong>Settings</strong>-menu.") +
					       TQString("</qt>"),
					       i18n("Need to Specify Editor"),
					       i18n("Use TDE's Editor Kate for Now"));
    if (r == KMessageBox::Continue)
      command = "kate %f";
    else
      return;
  }
  command = command.replace( "%l", TQString::number(splitter.line()) ).replace( "%f", KShellProcess::quote(TeXfile) );
  
#ifdef DEBUG_SPECIAL
  kdDebug(4300) << "Calling program: " << command << endl;
#endif
  
  // There may still be another program running. Since we don't
  // want to mix the output of several programs, we will
  // henceforth dimiss the output of the older programm. "If it
  // hasn't failed until now, we don't care."
  if (proc != 0) {
    tqApp->disconnect(proc, TQT_SIGNAL(receivedStderr(TDEProcess *, char *, int)), 0, 0);
    tqApp->disconnect(proc, TQT_SIGNAL(receivedStdout(TDEProcess *, char *, int)), 0, 0);
    proc = 0;
  }
  
  // Set up a shell process with the editor command.
  proc = new KShellProcess();
  if (proc == 0) {
    kdError(4300) << "Could not allocate ShellProcess for the editor command." << endl;
    return;
  }
  tqApp->connect(proc, TQT_SIGNAL(receivedStderr(TDEProcess *, char *, int)), this, TQT_SLOT(dvips_output_receiver(TDEProcess *, char *, int)));
  tqApp->connect(proc, TQT_SIGNAL(receivedStdout(TDEProcess *, char *, int)), this, TQT_SLOT(dvips_output_receiver(TDEProcess *, char *, int)));
  tqApp->connect(proc, TQT_SIGNAL(processExited(TDEProcess *)), this, TQT_SLOT(editorCommand_terminated(TDEProcess *)));
  // Merge the editor-specific editor message here.
  export_errorString = i18n("<qt>The external program<br><br><tt><strong>%1</strong></tt><br/><br/>which was used to call the editor "
			    "for inverse search, reported an error. You might wish to look at the <strong>document info "
			    "dialog</strong> which you will find in the File-Menu for a precise error report. The "
			    "manual for KDVI contains a detailed explanation how to set up your editor for use with KDVI, "
			    "and a list of common problems.</qt>").arg(command);
  
  info->clear(i18n("Starting the editor..."));
  
  int flashOffset      = e->y(); // Heuristic correction. Looks better.
  win->flash(flashOffset);
  
  
  proc->clearArguments();
  *proc << command;
  proc->closeStdin();
  if (proc->start(TDEProcess::NotifyOnExit, TDEProcess::AllOutput) == false) {
    kdError(4300) << "Editor failed to start" << endl;
    return;
  }
}


TQString dviRenderer::PDFencodingToTQString(const TQString& _pdfstring)
{
  // This method locates special PDF characters in a string and
  // replaces them by UTF8. See Section 3.2.3 of the PDF reference
  // guide for information.
  TQString pdfstring = _pdfstring;
  pdfstring = pdfstring.replace("\\n", "\n");
  pdfstring = pdfstring.replace("\\r", "\n");
  pdfstring = pdfstring.replace("\\t", "\t");
  pdfstring = pdfstring.replace("\\f", "\f");
  pdfstring = pdfstring.replace("\\(", "(");
  pdfstring = pdfstring.replace("\\)", ")");
  pdfstring = pdfstring.replace("\\\\", "\\");
  
  // Now replace octal character codes with the characters they encode
  int pos;
  TQRegExp rx( "(\\\\)(\\d\\d\\d)" );  // matches "\xyz" where x,y,z are numbers
  while((pos = rx.search( pdfstring )) != -1) {
    pdfstring = pdfstring.replace(pos, 4, TQChar(rx.cap(2).toInt(0,8)));
  }
  rx.setPattern( "(\\\\)(\\d\\d)" );  // matches "\xy" where x,y are numbers
  while((pos = rx.search( pdfstring )) != -1) {
    pdfstring = pdfstring.replace(pos, 3, TQChar(rx.cap(2).toInt(0,8)));
  }
  rx.setPattern( "(\\\\)(\\d)" );  // matches "\x" where x is a number
  while((pos = rx.search( pdfstring )) != -1) {
    pdfstring = pdfstring.replace(pos, 4, TQChar(rx.cap(2).toInt(0,8)));
  }
  return pdfstring;
}


#include "dviRenderer.moc"