src/rowpainter.cpp

   1 /**
   2  * \file rowpainter.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author various
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "rowpainter.h"
  15
  16 #include "Bidi.h"
  17 #include "Buffer.h"
  18 #include "CoordCache.h"
  19 #include "Cursor.h"
  20 #include "debug.h"
  21 #include "BufferParams.h"
  22 #include "BufferView.h"
  23 #include "Encoding.h"
  24 #include "gettext.h"
  25 #include "Language.h"
  26 #include "Color.h"
  27 #include "LyXRC.h"
  28 #include "Row.h"
  29 #include "MetricsInfo.h"
  30 #include "Paragraph.h"
  31 #include "ParagraphMetrics.h"
  32 #include "paragraph_funcs.h"
  33 #include "ParagraphParameters.h"
  34 #include "TextMetrics.h"
  35 #include "VSpace.h"
  36
  37 #include "frontends/FontMetrics.h"
  38 #include "frontends/Painter.h"
  39
  40 #include "insets/InsetText.h"
  41
  42 #include "support/textutils.h"
  43
  44 #include <boost/crc.hpp>
  45
  46 using std::endl;
  47 using std::max;
  48 using std::string;
  49
  50
  51 namespace lyx {
  52
  53 using frontend::Painter;
  54 using frontend::FontMetrics;
  55
  56 RowPainter::RowPainter(PainterInfo & pi,
  57         Text const & text, pit_type pit, Row const & row, Bidi & bidi, int x, int y)
  58         : bv_(*pi.base.bv), pain_(pi.pain), text_(text),
  59           text_metrics_(pi.base.bv->textMetrics(&text)),
  60           pars_(text.paragraphs()),
  61           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
  62           pm_(text_metrics_.parMetrics(pit)),
  63           bidi_(bidi), erased_(pi.erased_),
  64           xo_(x), yo_(y), width_(text_metrics_.width())
  65 {
  66         bidi_.computeTables(par_, bv_.buffer(), row_);
  67         x_ = row_.x + xo_;
  68
  69         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
  70         //row_.dump();
  71
  72         BOOST_ASSERT(pit >= 0);
  73         BOOST_ASSERT(pit < int(text.paragraphs().size()));
  74 }
  75
  76
  77 Font const RowPainter::getLabelFont() const
  78 {
  79         return text_.getLabelFont(bv_.buffer(), par_);
  80 }
  81
  82
  83 int RowPainter::leftMargin() const
  84 {
  85         return text_.leftMargin(bv_.buffer(), text_metrics_.width(), pit_,
  86                 row_.pos());
  87 }
  88
  89
  90 // If you want to debug inset metrics uncomment the following line:
  91 //#define DEBUG_METRICS
  92 // This draws green lines around each inset.
  93
  94
  95 void RowPainter::paintInset(pos_type & vpos)
  96 {
  97         pos_type const pos = bidi_.vis2log(vpos);
  98         Font font = text_.getFont(bv_.buffer(), par_, pos);
  99
 100         Inset const * inset = par_.getInset(pos);
 101         BOOST_ASSERT(inset);
 102         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 103         // FIXME: We should always use font, see documentation of
 104         // noFontChange() in Inset.h.
 105         pi.base.font = inset->noFontChange() ?
 106                 bv_.buffer().params().getFont() :
 107                 font;
 108         pi.ltr_pos = (bidi_.level(pos) % 2 == 0);
 109         pi.erased_ = erased_ || par_.isDeleted(pos);
 110         bv_.coordCache().insets().add(inset, int(x_), yo_);
 111         // insets are painted completely. Recursive
 112         inset->drawSelection(pi, int(x_), yo_);
 113         inset->draw(pi, int(x_), yo_);
 114
 115         ++vpos;
 116         paintForeignMark(x_, font, inset->descent());
 117
 118         x_ += inset->width();
 119
 120 #ifdef DEBUG_METRICS
 121         int const x1 = int(x_ - inset->width());
 122         Dimension dim;
 123         BOOST_ASSERT(max_witdh_ > 0);
 124         int right_margin = text_metrics_.rightMargin(pm_);
 125         int const w = max_witdh_ - leftMargin() - right_margin;
 126         MetricsInfo mi(&bv_, font, w);
 127         inset->metrics(mi, dim);
 128         if (inset->width() > dim.wid)
 129                 lyxerr << "Error: inset " << to_ascii(inset->getInsetName())
 130                        << " draw width " << inset->width()
 131                        << "> metrics width " << dim.wid << "." << std::endl;
 132         if (inset->ascent() > dim.asc)
 133                 lyxerr << "Error: inset " << to_ascii(inset->getInsetName())
 134                        << " draw ascent " << inset->ascent()
 135                        << "> metrics ascent " << dim.asc << "." << std::endl;
 136         if (inset->descent() > dim.des)
 137                 lyxerr << "Error: inset " << to_ascii(inset->getInsetName())
 138                        << " draw ascent " << inset->descent()
 139                        << "> metrics descent " << dim.des << "." << std::endl;
 140         BOOST_ASSERT(inset->width() <= dim.wid);
 141         BOOST_ASSERT(inset->ascent() <= dim.asc);
 142         BOOST_ASSERT(inset->descent() <= dim.des);
 143         int const x2 = x1 + dim.wid;
 144         int const y1 = yo_ + dim.des;
 145         int const y2 = yo_ - dim.asc;
 146         pi.pain.line(x1, y1, x1, y2, Color::green);
 147         pi.pain.line(x1, y1, x2, y1, Color::green);
 148         pi.pain.line(x2, y1, x2, y2, Color::green);
 149         pi.pain.line(x1, y2, x2, y2, Color::green);
 150 #endif
 151 }
 152
 153
 154 void RowPainter::paintHebrewComposeChar(pos_type & vpos, Font const & font)
 155 {
 156         pos_type pos = bidi_.vis2log(vpos);
 157
 158         docstring str;
 159
 160         // first char
 161         char_type c = par_.getChar(pos);
 162         str += c;
 163         ++vpos;
 164
 165         int const width = theFontMetrics(font).width(c);
 166         int dx = 0;
 167
 168         for (pos_type i = pos - 1; i >= 0; --i) {
 169                 c = par_.getChar(i);
 170                 if (!Encodings::isComposeChar_hebrew(c)) {
 171                         if (isPrintableNonspace(c)) {
 172                                 int const width2 = pm_.singleWidth(i,
 173                                         text_.getFont(bv_.buffer(), par_, i));
 174                                 dx = (c == 0x05e8 || // resh
 175                                       c == 0x05d3)   // dalet
 176                                         ? width2 - width
 177                                         : (width2 - width) / 2;
 178                         }
 179                         break;
 180                 }
 181         }
 182
 183         // Draw nikud
 184         pain_.text(int(x_) + dx, yo_, str, font);
 185 }
 186
 187
 188 void RowPainter::paintArabicComposeChar(pos_type & vpos, Font const & font)
 189 {
 190         pos_type pos = bidi_.vis2log(vpos);
 191         docstring str;
 192
 193         // first char
 194         char_type c = par_.getChar(pos);
 195         c = par_.transformChar(c, pos);
 196         str += c;
 197         ++vpos;
 198
 199         int const width = theFontMetrics(font).width(c);
 200         int dx = 0;
 201
 202         for (pos_type i = pos - 1; i >= 0; --i) {
 203                 c = par_.getChar(i);
 204                 if (!Encodings::isComposeChar_arabic(c)) {
 205                         if (isPrintableNonspace(c)) {
 206                                 int const width2 = pm_.singleWidth(i,
 207                                                 text_.getFont(bv_.buffer(), par_, i));
 208                                 dx = (width2 - width) / 2;
 209                         }
 210                         break;
 211                 }
 212         }
 213         // Draw nikud
 214         pain_.text(int(x_) + dx, yo_, str, font);
 215 }
 216
 217
 218 void RowPainter::paintChars(pos_type & vpos, Font const & font,
 219                             bool hebrew, bool arabic)
 220 {
 221         // This method takes up 70% of time when typing
 222         pos_type pos = bidi_.vis2log(vpos);
 223         pos_type const end = row_.endpos();
 224         FontSpan const font_span = par_.fontSpan(pos);
 225         Change::Type const prev_change = par_.lookupChange(pos).type;
 226
 227         // first character
 228         std::vector<char_type> str;
 229         str.reserve(100);
 230         str.push_back(par_.getChar(pos));
 231
 232         if (arabic) {
 233                 char_type c = str[0];
 234                 if (c == '(')
 235                         c = ')';
 236                 else if (c == ')')
 237                         c = '(';
 238                 str[0] = par_.transformChar(c, pos);
 239         }
 240
 241         // collect as much similar chars as we can
 242         for (++vpos ; vpos < end ; ++vpos) {
 243                 pos = bidi_.vis2log(vpos);
 244                 if (pos < font_span.first || pos > font_span.last)
 245                         break;
 246
 247                 if (prev_change != par_.lookupChange(pos).type)
 248                         break;
 249
 250                 char_type c = par_.getChar(pos);
 251
 252                 if (!isPrintableNonspace(c))
 253                         break;
 254
 255                 /* Because we do our own bidi, at this point the strings are
 256                  * already in visual order. However, Qt also applies its own
 257                  * bidi algorithm to strings that it paints to the screen.
 258                  * Therefore, if we were to paint Hebrew/Arabic words as a
 259                  * single string, the letters in the words would get reversed
 260                  * again. In order to avoid that, we don't collect Hebrew/
 261                  * Arabic characters, but rather paint them one at a time.
 262                  * See also http://thread.gmane.org/gmane.editors.lyx.devel/79740
 263                  */
 264                 if (hebrew)
 265                         break;
 266
 267                 /* FIXME: these checks are irrelevant, since 'arabic' and
 268                  * 'hebrew' alone are already going to trigger a break.
 269                  * However, this should not be removed completely, because
 270                  * if an alternative solution is found which allows grouping
 271                  * of arabic and hebrew characters, then these breaks may have
 272                  * to be re-applied.
 273
 274                 if (arabic && Encodings::isComposeChar_arabic(c))
 275                         break;
 276
 277                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 278                         break;
 279                 */
 280
 281                 if (arabic) {
 282                         if (c == '(')
 283                                 c = ')';
 284                         else if (c == ')')
 285                                 c = '(';
 286                         c = par_.transformChar(c, pos);
 287                         /* see comment in hebrew, explaining why we break */
 288                         break;
 289                 }
 290
 291                 str.push_back(c);
 292         }
 293
 294         docstring s(&str[0], str.size());
 295
 296         if (prev_change != Change::UNCHANGED) {
 297                 Font copy(font);
 298                 if (prev_change == Change::DELETED) {
 299                         copy.setColor(Color::deletedtext);
 300                 } else if (prev_change == Change::INSERTED) {
 301                         copy.setColor(Color::addedtext);
 302                 }
 303                 x_ += pain_.text(int(x_), yo_, s, copy);
 304         } else {
 305                 x_ += pain_.text(int(x_), yo_, s, font);
 306         }
 307 }
 308
 309
 310 void RowPainter::paintForeignMark(double orig_x, Font const & font, int desc)
 311 {
 312         if (!lyxrc.mark_foreign_language)
 313                 return;
 314         if (font.language() == latex_language)
 315                 return;
 316         if (font.language() == bv_.buffer().params().language)
 317                 return;
 318
 319         int const y = yo_ + 1 + desc;
 320         pain_.line(int(orig_x), y, int(x_), y, Color::language);
 321 }
 322
 323
 324 void RowPainter::paintFromPos(pos_type & vpos)
 325 {
 326         pos_type const pos = bidi_.vis2log(vpos);
 327         Font orig_font = text_.getFont(bv_.buffer(), par_, pos);
 328         double const orig_x = x_;
 329
 330         // usual characters, no insets
 331         char_type const c = par_.getChar(pos);
 332
 333         // special case languages
 334         std::string const & lang = orig_font.language()->lang();
 335         bool const hebrew = lang == "hebrew";
 336         bool const arabic = lang == "arabic_arabtex" || lang == "arabic_arabi" ||
 337                                                 lang == "farsi";
 338
 339         // draw as many chars as we can
 340         if ((!hebrew && !arabic)
 341                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 342                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 343                 paintChars(vpos, orig_font, hebrew, arabic);
 344         } else if (hebrew) {
 345                 paintHebrewComposeChar(vpos, orig_font);
 346         } else if (arabic) {
 347                 paintArabicComposeChar(vpos, orig_font);
 348         }
 349
 350         paintForeignMark(orig_x, orig_font);
 351 }
 352
 353
 354 void RowPainter::paintChangeBar()
 355 {
 356         pos_type const start = row_.pos();
 357         pos_type end = row_.endpos();
 358
 359         if (par_.size() == end) {
 360                 // this is the last row of the paragraph;
 361                 // thus, we must also consider the imaginary end-of-par character
 362                 end++;
 363         }
 364
 365         if (start == end || !par_.isChanged(start, end))
 366                 return;
 367
 368         int const height = text_.isLastRow(pit_, row_)
 369                 ? row_.ascent()
 370                 : row_.height();
 371
 372         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, Color::changebar);
 373 }
 374
 375
 376 void RowPainter::paintAppendix()
 377 {
 378         // only draw the appendix frame once (for the main text)
 379         if (!par_.params().appendix() || !text_.isMainText(bv_.buffer()))
 380                 return;
 381
 382         int y = yo_ - row_.ascent();
 383
 384         if (par_.params().startOfAppendix())
 385                 y += 2 * defaultRowHeight();
 386
 387         pain_.line(1, y, 1, yo_ + row_.height(), Color::appendix);
 388         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), Color::appendix);
 389 }
 390
 391
 392 void RowPainter::paintDepthBar()
 393 {
 394         depth_type const depth = par_.getDepth();
 395
 396         if (depth <= 0)
 397                 return;
 398
 399         depth_type prev_depth = 0;
 400         if (!text_.isFirstRow(pit_, row_)) {
 401                 pit_type pit2 = pit_;
 402                 if (row_.pos() == 0)
 403                         --pit2;
 404                 prev_depth = pars_[pit2].getDepth();
 405         }
 406
 407         depth_type next_depth = 0;
 408         if (!text_.isLastRow(pit_, row_)) {
 409                 pit_type pit2 = pit_;
 410                 if (row_.endpos() >= pars_[pit2].size())
 411                         ++pit2;
 412                 next_depth = pars_[pit2].getDepth();
 413         }
 414
 415         for (depth_type i = 1; i <= depth; ++i) {
 416                 int const w = nestMargin() / 5;
 417                 int x = int(xo_) + w * i;
 418                 // only consider the changebar space if we're drawing outermost text
 419                 if (text_.isMainText(bv_.buffer()))
 420                         x += changebarMargin();
 421
 422                 int const starty = yo_ - row_.ascent();
 423                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 424
 425                 pain_.line(x, starty, x, starty + h, Color::depthbar);
 426
 427                 if (i > prev_depth)
 428                         pain_.fillRectangle(x, starty, w, 2, Color::depthbar);
 429                 if (i > next_depth)
 430                         pain_.fillRectangle(x, starty + h, w, 2, Color::depthbar);
 431         }
 432 }
 433
 434
 435 int RowPainter::paintAppendixStart(int y)
 436 {
 437         Font pb_font;
 438         pb_font.setColor(Color::appendix);
 439         pb_font.decSize();
 440
 441         int w = 0;
 442         int a = 0;
 443         int d = 0;
 444
 445         docstring const label = _("Appendix");
 446         theFontMetrics(pb_font).rectText(label, w, a, d);
 447
 448         int const text_start = int(xo_ + (width_ - w) / 2);
 449         int const text_end = text_start + w;
 450
 451         pain_.rectText(text_start, y + d, label, pb_font, Color::none, Color::none);
 452
 453         pain_.line(int(xo_ + 1), y, text_start, y, Color::appendix);
 454         pain_.line(text_end, y, int(xo_ + width_ - 2), y, Color::appendix);
 455
 456         return 3 * defaultRowHeight();
 457 }
 458
 459
 460 void RowPainter::paintFirst()
 461 {
 462         ParagraphParameters const & parparams = par_.params();
 463
 464         int y_top = 0;
 465
 466         // start of appendix?
 467         if (parparams.startOfAppendix())
 468                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 469
 470         Buffer const & buffer = bv_.buffer();
 471
 472         LayoutPtr const & layout = par_.layout();
 473
 474         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 475                 if (pit_ != 0) {
 476                         if (layout->latextype == LATEX_PARAGRAPH
 477                                 && !par_.getDepth()) {
 478                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 479                         } else {
 480                                 LayoutPtr const & playout = pars_[pit_ - 1].layout();
 481                                 if (playout->latextype == LATEX_PARAGRAPH
 482                                         && !pars_[pit_ - 1].getDepth()) {
 483                                         // is it right to use defskip here, too? (AS)
 484                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 485                                 }
 486                         }
 487                 }
 488         }
 489
 490         bool const is_rtl = text_.isRTL(buffer, par_);
 491         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 492         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 493
 494         // should we print a label?
 495         if (layout->labeltype >= LABEL_STATIC
 496             && (layout->labeltype != LABEL_STATIC
 497                       || layout->latextype != LATEX_ENVIRONMENT
 498                       || is_seq)) {
 499
 500                 Font const font = getLabelFont();
 501                 FontMetrics const & fm = theFontMetrics(font);
 502
 503                 docstring const str = par_.getLabelstring();
 504                 if (!str.empty()) {
 505                         double x = x_;
 506
 507                         // this is special code for the chapter layout. This is
 508                         // printed in an extra row and has a pagebreak at
 509                         // the top.
 510                         if (layout->counter == "chapter") {
 511                                 double spacing_val = 1.0;
 512                                 if (!parparams.spacing().isDefault()) {
 513                                         spacing_val = parparams.spacing().getValue();
 514                                 } else {
 515                                         spacing_val = buffer.params().spacing().getValue();
 516                                 }
 517
 518                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 519
 520                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 521                                         + int(layout->parsep) * defaultRowHeight();
 522
 523                                 if (is_rtl) {
 524                                         x = width_ - leftMargin() -
 525                                                 fm.width(str);
 526                                 }
 527
 528                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 529                         } else {
 530                                 if (is_rtl) {
 531                                         x = width_ - leftMargin()
 532                                                 + fm.width(layout->labelsep);
 533                                 } else {
 534                                         x = x_ - fm.width(layout->labelsep)
 535                                                 - fm.width(str);
 536                                 }
 537
 538                                 pain_.text(int(x), yo_, str, font);
 539                         }
 540                 }
 541
 542         // the labels at the top of an environment.
 543         // More or less for bibliography
 544         } else if (is_seq &&
 545                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 546                 layout->labeltype == LABEL_BIBLIO ||
 547                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 548                 Font font = getLabelFont();
 549                 if (!par_.getLabelstring().empty()) {
 550                         docstring const str = par_.getLabelstring();
 551                         double spacing_val = 1.0;
 552                         if (!parparams.spacing().isDefault())
 553                                 spacing_val = parparams.spacing().getValue();
 554                         else
 555                                 spacing_val = buffer.params().spacing().getValue();
 556
 557                         FontMetrics const & fm = theFontMetrics(font);
 558
 559                         int const labeladdon = int(fm.maxHeight()
 560                                 * layout->spacing.getValue() * spacing_val);
 561
 562                         int maxdesc =
 563                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 564                                 + (layout->labelbottomsep * defaultRowHeight()));
 565
 566                         double x = x_;
 567                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 568                                 if (is_rtl)
 569                                         x = leftMargin();
 570                                 x += (width_ - text_metrics_.rightMargin(pm_) - leftMargin()) / 2;
 571                                 x -= fm.width(str) / 2;
 572                         } else if (is_rtl) {
 573                                 x = width_ - leftMargin() -     fm.width(str);
 574                         }
 575                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 576                 }
 577         }
 578 }
 579
 580
 581 void RowPainter::paintLast()
 582 {
 583         bool const is_rtl = text_.isRTL(bv_.buffer(), par_);
 584         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 585
 586         // paint imaginary end-of-paragraph character
 587
 588         if (par_.isInserted(par_.size()) || par_.isDeleted(par_.size())) {
 589                 FontMetrics const & fm = theFontMetrics(bv_.buffer().params().getFont());
 590                 int const length = fm.maxAscent() / 2;
 591                 Color::color col = par_.isInserted(par_.size()) ? Color::addedtext : Color::deletedtext;
 592
 593                 pain_.line(int(x_) + 1, yo_ + 2, int(x_) + 1, yo_ + 2 - length, col,
 594                            Painter::line_solid, Painter::line_thick);
 595                 pain_.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1, yo_ + 2, col,
 596                            Painter::line_solid, Painter::line_thick);
 597         }
 598
 599         // draw an endlabel
 600
 601         switch (endlabel) {
 602         case END_LABEL_BOX:
 603         case END_LABEL_FILLED_BOX: {
 604                 Font const font = getLabelFont();
 605                 FontMetrics const & fm = theFontMetrics(font);
 606                 int const size = int(0.75 * fm.maxAscent());
 607                 int const y = yo_ - size;
 608                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 609
 610                 if (width_ - int(row_.width()) <= size)
 611                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 612
 613                 if (endlabel == END_LABEL_BOX)
 614                         pain_.rectangle(x, y, size, size, Color::eolmarker);
 615                 else
 616                         pain_.fillRectangle(x, y, size, size, Color::eolmarker);
 617                 break;
 618         }
 619
 620         case END_LABEL_STATIC: {
 621                 Font font = getLabelFont();
 622                 FontMetrics const & fm = theFontMetrics(font);
 623                 docstring const & str = par_.layout()->endlabelstring();
 624                 double const x = is_rtl ?
 625                         x_ - fm.width(str)
 626                         : - text_metrics_.rightMargin(pm_) - row_.width();
 627                 pain_.text(int(x), yo_, str, font);
 628                 break;
 629         }
 630
 631         case END_LABEL_NO_LABEL:
 632                 break;
 633         }
 634 }
 635
 636
 637 void RowPainter::paintText()
 638 {
 639         pos_type const end = row_.endpos();
 640         // Spaces at logical line breaks in bidi text must be skipped during
 641         // painting. However, they may appear visually in the middle
 642         // of a row; they must be skipped, wherever they are...
 643         // * logically "abc_[HEBREW_\nHEBREW]"
 644         // * visually "abc_[_WERBEH\nWERBEH]"
 645         pos_type skipped_sep_vpos = -1;
 646         pos_type body_pos = par_.beginOfBody();
 647         if (body_pos > 0 &&
 648                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 649                 body_pos = 0;
 650         }
 651
 652         LayoutPtr const & layout = par_.layout();
 653
 654         bool running_strikeout = false;
 655         bool is_struckout = false;
 656         int last_strikeout_x = 0;
 657
 658         // Use font span to speed things up, see below
 659         FontSpan font_span;
 660         Font font;
 661         Buffer const & buffer = bv_.buffer();
 662
 663         // If the last logical character is a separator, don't paint it, unless
 664         // it's in the last row of a paragraph; see skipped_sep_vpos declaration
 665         if (end > 0 && end < par_.size() && par_.isSeparator(end - 1))
 666                 skipped_sep_vpos = bidi_.log2vis(end - 1);
 667
 668         for (pos_type vpos = row_.pos(); vpos < end; ) {
 669                 if (x_ > bv_.workWidth())
 670                         break;
 671
 672                 // Skip the separator at the logical end of the row
 673                 if (vpos == skipped_sep_vpos) {
 674                         ++vpos;
 675                         continue;
 676                 }
 677
 678                 pos_type const pos = bidi_.vis2log(vpos);
 679
 680                 if (pos >= par_.size()) {
 681                         ++vpos;
 682                         continue;
 683                 }
 684
 685                 // Use font span to speed things up, see above
 686                 if (vpos < font_span.first || vpos > font_span.last) {
 687                         font_span = par_.fontSpan(vpos);
 688                         font = text_.getFont(buffer, par_, vpos);
 689                 }
 690
 691                 const int width_pos = pm_.singleWidth(pos, font);
 692
 693                 if (x_ + width_pos < 0) {
 694                         x_ += width_pos;
 695                         ++vpos;
 696                         continue;
 697                 }
 698
 699                 is_struckout = par_.isDeleted(pos);
 700
 701                 if (is_struckout && !running_strikeout) {
 702                         running_strikeout = true;
 703                         last_strikeout_x = int(x_);
 704                 }
 705
 706                 bool const highly_editable_inset = par_.isInset(pos)
 707                         && isHighlyEditableInset(par_.getInset(pos));
 708
 709                 // If we reach the end of a struck out range, paint it.
 710                 // We also don't paint across things like tables
 711                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 712                         // Calculate 1/3 height of the buffer's default font
 713                         FontMetrics const & fm
 714                                 = theFontMetrics(bv_.buffer().params().getFont());
 715                         int const middle = yo_ - fm.maxAscent() / 3;
 716                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 717                                 Color::deletedtext, Painter::line_solid, Painter::line_thin);
 718                         running_strikeout = false;
 719                 }
 720
 721                 if (body_pos > 0 && pos == body_pos - 1) {
 722                         int const lwidth = theFontMetrics(getLabelFont())
 723                                 .width(layout->labelsep);
 724
 725                         x_ += row_.label_hfill + lwidth - width_pos;
 726                 }
 727
 728                 if (par_.isHfill(pos)) {
 729                         x_ += 1;
 730
 731                         int const y0 = yo_;
 732                         int const y1 = y0 - defaultRowHeight() / 2;
 733
 734                         pain_.line(int(x_), y1, int(x_), y0, Color::added_space);
 735
 736                         if (par_.hfillExpansion(row_, pos)) {
 737                                 int const y2 = (y0 + y1) / 2;
 738
 739                                 if (pos >= body_pos) {
 740                                         pain_.line(int(x_), y2, int(x_ + row_.hfill), y2,
 741                                                   Color::added_space,
 742                                                   Painter::line_onoffdash);
 743                                         x_ += row_.hfill;
 744                                 } else {
 745                                         pain_.line(int(x_), y2, int(x_ + row_.label_hfill), y2,
 746                                                   Color::added_space,
 747                                                   Painter::line_onoffdash);
 748                                         x_ += row_.label_hfill;
 749                                 }
 750                                 pain_.line(int(x_), y1, int(x_), y0, Color::added_space);
 751                         }
 752                         x_ += 2;
 753                         ++vpos;
 754
 755                 } else if (par_.isSeparator(pos)) {
 756                         Font orig_font = text_.getFont(bv_.buffer(), par_, pos);
 757                         double const orig_x = x_;
 758                         x_ += width_pos;
 759                         if (pos >= body_pos)
 760                                 x_ += row_.separator;
 761                         ++vpos;
 762                         paintForeignMark(orig_x, orig_font);
 763
 764                 } else if (par_.isInset(pos)) {
 765                         // If outer row has changed, nested insets are repaint completely.
 766                         paintInset(vpos);
 767
 768                 } else {
 769                         paintFromPos(vpos);
 770                 }
 771         }
 772
 773         // if we reach the end of a struck out range, paint it
 774         if (running_strikeout) {
 775                 // calculate 1/3 height of the buffer's default font
 776                 FontMetrics const & fm
 777                         = theFontMetrics(bv_.buffer().params().getFont());
 778                 int const middle = yo_ - fm.maxAscent() / 3;
 779                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 780                         Color::deletedtext, Painter::line_solid, Painter::line_thin);
 781                 running_strikeout = false;
 782         }
 783 }
 784
 785 } // namespace lyx