src/rowpainter.C

   1 /**
   2  * \file rowpainter.C
   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 "buffer.h"
  17 #include "coordcache.h"
  18 #include "cursor.h"
  19 #include "debug.h"
  20 #include "bufferparams.h"
  21 #include "BufferView.h"
  22 #include "encoding.h"
  23 #include "gettext.h"
  24 #include "language.h"
  25 #include "LColor.h"
  26 #include "lyxrc.h"
  27 #include "lyxrow.h"
  28 #include "lyxrow_funcs.h"
  29 #include "metricsinfo.h"
  30 #include "paragraph.h"
  31 #include "paragraph_funcs.h"
  32 #include "ParagraphParameters.h"
  33 #include "vspace.h"
  34
  35 #include "frontends/font_metrics.h"
  36 #include "frontends/nullpainter.h"
  37 #include "frontends/Painter.h"
  38
  39 #include "insets/insettext.h"
  40
  41 #include "support/textutils.h"
  42
  43 #include <boost/crc.hpp>
  44
  45 using lyx::frontend::Painter;
  46 using lyx::frontend::NullPainter;
  47 using lyx::char_type;
  48 using lyx::pos_type;
  49 using lyx::pit_type;
  50
  51 using std::endl;
  52 using std::max;
  53 using std::min;
  54 using std::string;
  55
  56
  57 namespace {
  58
  59 /// Flag: do a full redraw of inside text of inset
  60 /// Working variable indicating a full screen refresh
  61 bool refreshInside;
  62
  63 /**
  64  * A class used for painting an individual row of text.
  65  */
  66 class RowPainter {
  67 public:
  68         /// initialise and run painter
  69         RowPainter(PainterInfo & pi, LyXText const & text,
  70                 pit_type pit, Row const & row, int x, int y);
  71
  72         // paint various parts
  73         void paintAppendix();
  74         void paintDepthBar();
  75         void paintChangeBar();
  76         void paintFirst();
  77         void paintLast();
  78         void paintText();
  79
  80 private:
  81         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  82         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  83         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  84         void paintChars(lyx::pos_type & vpos, LyXFont font,
  85                         bool hebrew, bool arabic);
  86         int paintAppendixStart(int y);
  87         void paintFromPos(lyx::pos_type & vpos);
  88         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  89
  90         /// return left margin
  91         int leftMargin() const;
  92
  93         /// return the label font for this row
  94         LyXFont const getLabelFont() const;
  95
  96         /// bufferview to paint on
  97         BufferView const & bv_;
  98
  99         /// Painter to use
 100         Painter & pain_;
 101
 102         /// LyXText for the row
 103         LyXText const & text_;
 104         ParagraphList const & pars_;
 105
 106         /// The row to paint
 107         Row const & row_;
 108
 109         /// Row's paragraph
 110         pit_type const pit_;
 111         Paragraph const & par_;
 112
 113         /// is row erased? (change tracking)
 114         bool erased_;
 115
 116         // Looks ugly - is
 117         double const xo_;
 118         int const yo_;    // current baseline
 119         double x_;
 120         int width_;
 121         double separator_;
 122         double hfill_;
 123         double label_hfill_;
 124 };
 125
 126
 127 RowPainter::RowPainter(PainterInfo & pi,
 128         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 129         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 130           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 131           erased_(pi.erased_),
 132           xo_(x), yo_(y), width_(text_.width())
 133 {
 134         RowMetrics m = text_.computeRowMetrics(pit, row_);
 135         x_ = m.x + xo_;
 136
 137         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 138         //row_.dump();
 139
 140         separator_ = m.separator;
 141         hfill_ = m.hfill;
 142         label_hfill_ = m.label_hfill;
 143
 144         BOOST_ASSERT(pit >= 0);
 145         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 146 }
 147
 148
 149 LyXFont const RowPainter::getLabelFont() const
 150 {
 151         return text_.getLabelFont(par_);
 152 }
 153
 154
 155 int RowPainter::leftMargin() const
 156 {
 157         return text_.leftMargin(pit_, row_.pos());
 158 }
 159
 160
 161 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 162 {
 163         InsetBase const * inset = par_.getInset(pos);
 164         BOOST_ASSERT(inset);
 165         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 166         // FIXME: We should always use font, see documentation of
 167         // noFontChange() in insetbase.h.
 168         pi.base.font = inset->noFontChange() ?
 169                 bv_.buffer()->params().getFont() :
 170                 font;
 171         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 172         pi.erased_ = erased_ || isDeletedText(par_, pos);
 173         theCoords.insets().add(inset, int(x_), yo_);
 174         InsetText const * const in = inset->asTextInset();
 175         // non-wide insets are painted completely. Recursive
 176         bool tmp = refreshInside;
 177         if (!in || !in->Wide()) {
 178                 refreshInside = true;
 179                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 180         }
 181         if (refreshInside)
 182                 inset->drawSelection(pi, int(x_), yo_);
 183         inset->draw(pi, int(x_), yo_);
 184         refreshInside = tmp;
 185         x_ += inset->width();
 186 }
 187
 188
 189 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 190 {
 191         pos_type pos = text_.bidi.vis2log(vpos);
 192
 193         string str;
 194
 195         // first char
 196         char_type c = par_.getChar(pos);
 197         str += c;
 198         ++vpos;
 199
 200         int const width = font_metrics::width(c, font);
 201         int dx = 0;
 202
 203         for (pos_type i = pos - 1; i >= 0; --i) {
 204                 c = par_.getChar(i);
 205                 if (!Encodings::isComposeChar_hebrew(c)) {
 206                         if (isPrintableNonspace(c)) {
 207                                 int const width2 =
 208                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 209                                 // dalet / resh
 210                                 dx = (c == 'ø' || c == 'ã')
 211                                         ? width2 - width
 212                                         : (width2 - width) / 2;
 213                         }
 214                         break;
 215                 }
 216         }
 217
 218         // Draw nikud
 219         pain_.text(int(x_) + dx, yo_, str, font);
 220 }
 221
 222
 223 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 224 {
 225         pos_type pos = text_.bidi.vis2log(vpos);
 226         string str;
 227
 228         // first char
 229         char_type c = par_.getChar(pos);
 230         c = par_.transformChar(c, pos);
 231         str += c;
 232         ++vpos;
 233
 234         int const width = font_metrics::width(c, font);
 235         int dx = 0;
 236
 237         for (pos_type i = pos - 1; i >= 0; --i) {
 238                 c = par_.getChar(i);
 239                 if (!Encodings::isComposeChar_arabic(c)) {
 240                         if (isPrintableNonspace(c)) {
 241                                 int const width2 =
 242                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 243                                 dx = (width2 - width) / 2;
 244                         }
 245                         break;
 246                 }
 247         }
 248         // Draw nikud
 249         pain_.text(int(x_) + dx, yo_, str, font);
 250 }
 251
 252
 253 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 254                             bool hebrew, bool arabic)
 255 {
 256         pos_type pos = text_.bidi.vis2log(vpos);
 257         pos_type const end = row_.endpos();
 258         FontSpan const font_span = par_.fontSpan(pos);
 259         Change::Type const prev_change = par_.lookupChange(pos).type;
 260
 261         // first character
 262         string str;
 263         str += par_.getChar(pos);
 264         if (arabic) {
 265                 unsigned char c = str[0];
 266                 str[0] = par_.transformChar(c, pos);
 267         }
 268
 269         // collect as much similar chars as we can
 270         for (++vpos ; vpos < end ; ++vpos) {
 271                 pos = text_.bidi.vis2log(vpos);
 272                 if (pos < font_span.first || pos > font_span.last)
 273                         break;
 274
 275                 if (prev_change != par_.lookupChange(pos))
 276                         break;
 277
 278                 char_type c = par_.getChar(pos);
 279
 280                 if (!isPrintableNonspace(c))
 281                         break;
 282
 283                 if (arabic && Encodings::isComposeChar_arabic(c))
 284                         break;
 285
 286                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 287                         break;
 288
 289                 if (arabic)
 290                         c = par_.transformChar(c, pos);
 291
 292                 str += c;
 293         }
 294
 295         if (prev_change == Change::DELETED)
 296                 font.setColor(LColor::strikeout);
 297         else if (prev_change == Change::INSERTED)
 298                 font.setColor(LColor::newtext);
 299
 300         // Draw text and set the new x position
 301         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 302         pain_.text(int(x_), yo_, str, font);
 303         x_ += font_metrics::width(str, font);
 304 }
 305
 306
 307 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 308 {
 309         if (!lyxrc.mark_foreign_language)
 310                 return;
 311         if (font.language() == latex_language)
 312                 return;
 313         if (font.language() == bv_.buffer()->params().language)
 314                 return;
 315
 316         int const y = yo_ + 1 + desc;
 317         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 318 }
 319
 320
 321 void RowPainter::paintFromPos(pos_type & vpos)
 322 {
 323         pos_type const pos = text_.bidi.vis2log(vpos);
 324         LyXFont orig_font = text_.getFont(par_, pos);
 325
 326         double const orig_x = x_;
 327
 328         if (par_.isInset(pos)) {
 329                 paintInset(pos, orig_font);
 330                 ++vpos;
 331                 paintForeignMark(orig_x, orig_font,
 332                         par_.getInset(pos)->descent());
 333                 return;
 334         }
 335
 336         // usual characters, no insets
 337         char_type const c = par_.getChar(pos);
 338
 339         // special case languages
 340         std::string const & lang = orig_font.language()->lang();
 341         bool const hebrew = lang == "hebrew";
 342         bool const arabic = lang == "arabic" &&
 343                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 344                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 345
 346         // draw as many chars as we can
 347         if ((!hebrew && !arabic)
 348                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 349                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 350                 paintChars(vpos, orig_font, hebrew, arabic);
 351         } else if (hebrew) {
 352                 paintHebrewComposeChar(vpos, orig_font);
 353         } else if (arabic) {
 354                 paintArabicComposeChar(vpos, orig_font);
 355         }
 356
 357         paintForeignMark(orig_x, orig_font);
 358 }
 359
 360
 361 void RowPainter::paintChangeBar()
 362 {
 363         pos_type const start = row_.pos();
 364         pos_type const end = row_.endpos();
 365
 366         if (start == end || !par_.isChanged(start, end))
 367                 return;
 368
 369         int const height = text_.isLastRow(pit_, row_)
 370                 ? row_.ascent()
 371                 : row_.height();
 372
 373         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 374 }
 375
 376
 377 void RowPainter::paintAppendix()
 378 {
 379         if (!par_.params().appendix())
 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(), LColor::appendix);
 388         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 389 }
 390
 391
 392 void RowPainter::paintDepthBar()
 393 {
 394         Paragraph::depth_type const depth = par_.getDepth();
 395
 396         if (depth <= 0)
 397                 return;
 398
 399         Paragraph::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         Paragraph::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 (Paragraph::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())
 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, LColor::depthbar);
 426
 427                 if (i > prev_depth)
 428                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 429                 if (i > next_depth)
 430                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 431         }
 432 }
 433
 434
 435 int RowPainter::paintAppendixStart(int y)
 436 {
 437         LyXFont pb_font;
 438         pb_font.setColor(LColor::appendix);
 439         pb_font.decSize();
 440
 441         string const label = _("Appendix");
 442         int w = 0;
 443         int a = 0;
 444         int d = 0;
 445         font_metrics::rectText(label, pb_font, w, a, d);
 446
 447         int const text_start = int(xo_ + (width_ - w) / 2);
 448         int const text_end = text_start + w;
 449
 450         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 451
 452         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 453         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 454
 455         return 3 * defaultRowHeight();
 456 }
 457
 458
 459 void RowPainter::paintFirst()
 460 {
 461         ParagraphParameters const & parparams = par_.params();
 462
 463         int y_top = 0;
 464
 465         // start of appendix?
 466         if (parparams.startOfAppendix())
 467                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 468
 469         Buffer const & buffer = *bv_.buffer();
 470
 471         LyXLayout_ptr const & layout = par_.layout();
 472
 473         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 474                 if (pit_ != 0) {
 475                         if (layout->latextype == LATEX_PARAGRAPH
 476                                 && !par_.getDepth()) {
 477                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 478                         } else {
 479                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 480                                 if (playout->latextype == LATEX_PARAGRAPH
 481                                         && !pars_[pit_ - 1].getDepth()) {
 482                                         // is it right to use defskip here, too? (AS)
 483                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 484                                 }
 485                         }
 486                 }
 487         }
 488
 489         bool const is_rtl = text_.isRTL(par_);
 490         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 491         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 492
 493         // should we print a label?
 494         if (layout->labeltype >= LABEL_STATIC
 495             && (layout->labeltype != LABEL_STATIC
 496                       || layout->latextype != LATEX_ENVIRONMENT
 497                       || is_seq)) {
 498
 499                 LyXFont const font = getLabelFont();
 500                 string const str = par_.getLabelstring();
 501                 if (!str.empty()) {
 502                         double x = x_;
 503
 504                         // this is special code for the chapter layout. This is
 505                         // printed in an extra row and has a pagebreak at
 506                         // the top.
 507                         if (layout->counter == "chapter") {
 508                                 double spacing_val = 1.0;
 509                                 if (!parparams.spacing().isDefault()) {
 510                                         spacing_val = parparams.spacing().getValue();
 511                                 } else {
 512                                         spacing_val = buffer.params().spacing().getValue();
 513                                 }
 514
 515                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 516
 517                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 518                                         + int(layout->parsep) * defaultRowHeight();
 519
 520                                 if (is_rtl) {
 521                                         x = width_ - leftMargin() -
 522                                                 font_metrics::width(str, font);
 523                                 }
 524
 525                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 526                         } else {
 527                                 if (is_rtl) {
 528                                         x = width_ - leftMargin()
 529                                                 + font_metrics::width(layout->labelsep, font);
 530                                 } else {
 531                                         x = x_ - font_metrics::width(layout->labelsep, font)
 532                                                 - font_metrics::width(str, font);
 533                                 }
 534
 535                                 pain_.text(int(x), yo_, str, font);
 536                         }
 537                 }
 538
 539         // the labels at the top of an environment.
 540         // More or less for bibliography
 541         } else if (is_seq &&
 542                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 543                 layout->labeltype == LABEL_BIBLIO ||
 544                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 545                 LyXFont font = getLabelFont();
 546                 if (!par_.getLabelstring().empty()) {
 547                         string const str = par_.getLabelstring();
 548                         double spacing_val = 1.0;
 549                         if (!parparams.spacing().isDefault())
 550                                 spacing_val = parparams.spacing().getValue();
 551                         else
 552                                 spacing_val = buffer.params().spacing().getValue();
 553
 554                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 555
 556                         int maxdesc =
 557                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 558                                 + (layout->labelbottomsep * defaultRowHeight()));
 559
 560                         double x = x_;
 561                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 562                                 if (is_rtl)
 563                                         x = leftMargin();
 564                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 565                                 x -= font_metrics::width(str, font) / 2;
 566                         } else if (is_rtl) {
 567                                 x = width_ - leftMargin() -
 568                                         font_metrics::width(str, font);
 569                         }
 570                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 571                 }
 572         }
 573 }
 574
 575
 576 void RowPainter::paintLast()
 577 {
 578         bool const is_rtl = text_.isRTL(par_);
 579         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 580
 581         // draw an endlabel
 582         switch (endlabel) {
 583         case END_LABEL_BOX:
 584         case END_LABEL_FILLED_BOX: {
 585                 LyXFont const font = getLabelFont();
 586                 int const size = int(0.75 * font_metrics::maxAscent(font));
 587                 int const y = yo_ - size;
 588                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 589
 590                 if (width_ - int(row_.width()) <= size)
 591                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 592
 593                 if (endlabel == END_LABEL_BOX)
 594                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 595                 else
 596                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 597                 break;
 598         }
 599
 600         case END_LABEL_STATIC: {
 601                 LyXFont font = getLabelFont();
 602                 string const & str = par_.layout()->endlabelstring();
 603                 double const x = is_rtl ?
 604                         x_ - font_metrics::width(str, font)
 605                         : - text_.rightMargin(par_) - row_.width();
 606                 pain_.text(int(x), yo_, str, font);
 607                 break;
 608         }
 609
 610         case END_LABEL_NO_LABEL:
 611                 break;
 612         }
 613 }
 614
 615
 616 void RowPainter::paintText()
 617 {
 618         pos_type const end = row_.endpos();
 619         pos_type body_pos = par_.beginOfBody();
 620         if (body_pos > 0 &&
 621                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 622                 body_pos = 0;
 623         }
 624
 625         LyXLayout_ptr const & layout = par_.layout();
 626
 627         bool running_strikeout = false;
 628         bool is_struckout = false;
 629         int last_strikeout_x = 0;
 630
 631         // Use font span to speed things up, see below
 632         FontSpan font_span;
 633         LyXFont font;
 634
 635         for (pos_type vpos = row_.pos(); vpos < end; ) {
 636                 if (x_ > bv_.workWidth())
 637                         break;
 638
 639                 pos_type const pos = text_.bidi.vis2log(vpos);
 640
 641                 if (pos >= par_.size()) {
 642                         ++vpos;
 643                         continue;
 644                 }
 645
 646                 // Use font span to speed things up, see above
 647                 if (vpos < font_span.first || vpos > font_span.last) {
 648                         font_span = par_.fontSpan(vpos);
 649                         font = text_.getFont(par_, vpos);
 650                 }
 651
 652                 const int width_pos =
 653                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 654
 655                 if (x_ + width_pos < 0) {
 656                         x_ += width_pos;
 657                         ++vpos;
 658                         continue;
 659                 }
 660
 661                 is_struckout = isDeletedText(par_, pos);
 662
 663                 if (is_struckout && !running_strikeout) {
 664                         running_strikeout = true;
 665                         last_strikeout_x = int(x_);
 666                 }
 667
 668                 bool const highly_editable_inset = par_.isInset(pos)
 669                         && isHighlyEditableInset(par_.getInset(pos));
 670
 671                 // If we reach the end of a struck out range, paint it.
 672                 // We also don't paint across things like tables
 673                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 674                         // Calculate 1/3 height of the buffer's default font
 675                         int const middle =
 676                                 yo_ -
 677                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 678                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 679                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 680                         running_strikeout = false;
 681                 }
 682
 683                 if (body_pos > 0 && pos == body_pos - 1) {
 684                         int const lwidth = font_metrics::width(layout->labelsep,
 685                                 getLabelFont());
 686
 687                         x_ += label_hfill_ + lwidth - width_pos;
 688                 }
 689
 690                 if (par_.isHfill(pos)) {
 691                         x_ += 1;
 692
 693                         int const y0 = yo_;
 694                         int const y1 = y0 - defaultRowHeight() / 2;
 695
 696                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 697
 698                         if (hfillExpansion(par_, row_, pos)) {
 699                                 int const y2 = (y0 + y1) / 2;
 700
 701                                 if (pos >= body_pos) {
 702                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 703                                                   LColor::added_space,
 704                                                   Painter::line_onoffdash);
 705                                         x_ += hfill_;
 706                                 } else {
 707                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 708                                                   LColor::added_space,
 709                                                   Painter::line_onoffdash);
 710                                         x_ += label_hfill_;
 711                                 }
 712                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 713                         }
 714                         x_ += 2;
 715                         ++vpos;
 716                 } else if (par_.isSeparator(pos)) {
 717                         x_ += width_pos;
 718                         if (pos >= body_pos)
 719                                 x_ += separator_;
 720                         ++vpos;
 721                 } else {
 722                         paintFromPos(vpos);
 723                 }
 724         }
 725
 726         // if we reach the end of a struck out range, paint it
 727         if (running_strikeout) {
 728                 // calculate 1/3 height of the buffer's default font
 729                 int const middle =
 730                         yo_ -
 731                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 732                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 733                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 734                 running_strikeout = false;
 735         }
 736 }
 737
 738
 739 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 740         int x, int y)
 741 {
 742         boost::crc_32_type crc;
 743         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 744                 const unsigned char b[] = { par.getChar(i) };
 745                 crc.process_bytes(b, 1);
 746         }
 747         const unsigned char b[] = { x, y, row.width() };
 748         crc.process_bytes(b, 3);
 749         return crc.checksum();
 750 }
 751
 752
 753 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 754         RowList::const_iterator rit, LyXText const & text)
 755 {
 756         // Is there a cursor on this row (or inside inset on row)
 757         LCursor & cur = pi.base.bv->cursor();
 758         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 759                 CursorSlice const & sl = cur[d];
 760                 if (sl.text() == &text
 761                     && sl.pit() == pit
 762                     && sl.pos() >= rit->pos()
 763                     && sl.pos() <= rit->endpos())
 764                         return true;
 765         }
 766         return false;
 767 }
 768
 769
 770 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 771         RowList::const_iterator rit, LyXText const & text)
 772 {
 773         // Is there a cursor inside an inset on this row, and is this inset
 774         // the only "character" on this row
 775         LCursor & cur = pi.base.bv->cursor();
 776         if (rit->pos() + 1 != rit->endpos())
 777                 return false;
 778         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 779                 CursorSlice const & sl = cur[d];
 780                 if (sl.text() == &text
 781                     && sl.pit() == pit
 782                     && sl.pos() == rit->pos())
 783                         return d < cur.depth() - 1;
 784         }
 785         return false;
 786 }
 787
 788
 789 void paintPar
 790         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 791          bool repaintAll)
 792 {
 793 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 794         static NullPainter nop;
 795         static PainterInfo nullpi(pi.base.bv, nop);
 796         int const ww = pi.base.bv->workHeight();
 797
 798         Paragraph const & par = text.paragraphs()[pit];
 799
 800         RowList::const_iterator const rb = par.rows().begin();
 801         RowList::const_iterator const re = par.rows().end();
 802         theCoords.parPos()[&text][pit] = Point(x, y);
 803
 804         y -= rb->ascent();
 805         lyx::size_type rowno(0);
 806         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 807                 y += rit->ascent();
 808                 // Allow setting of refreshInside for nested insets in
 809                 // this row only
 810                 bool tmp = refreshInside;
 811
 812                 // Row signature; has row changed since last paint?
 813                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 814                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 815
 816                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 817                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 818                         text);
 819
 820                 // If this is the only object on the row, we can make it wide
 821                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 822                         InsetBase const * const in = par.getInset(i);
 823                         if (in) {
 824                                 InsetText const * const t = in->asTextInset();
 825                                 if (t)
 826                                         t->Wide() = in_inset_alone_on_row;
 827                         }
 828                 }
 829
 830                 // If selection is on, the current row signature differs
 831                 // from cache, or cursor is inside an inset _on this row_,
 832                 // then paint the row
 833                 if (repaintAll || row_has_changed || cursor_on_row) {
 834                         // Add to row signature cache
 835                         par.rowSignature()[rowno] = row_sig;
 836
 837                         bool const inside = (y + rit->descent() >= 0
 838                                        && y - rit->ascent() < ww);
 839                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 840                         // Clear background of this row
 841                         // (if paragraph background was not cleared)
 842                         if (!repaintAll &&
 843                             (!in_inset_alone_on_row || row_has_changed)) {
 844                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 845                                     text.maxwidth_, rit->height(),
 846                                     text.backgroundColor());
 847                                 // If outer row has changed, force nested
 848                                 // insets to repaint completely
 849                                 if (row_has_changed)
 850                                         refreshInside = true;
 851                         }
 852
 853                         // Instrumentation for testing row cache (see also
 854                         // 12 lines lower):
 855                         if (text.isMainText())
 856                                 lyxerr[Debug::PAINTING] << "#";
 857                         else
 858                                 lyxerr[Debug::PAINTING] << "[" <<
 859                                     repaintAll << row_has_changed <<
 860                                     cursor_on_row << "]";
 861                         rp.paintAppendix();
 862                         rp.paintDepthBar();
 863                         rp.paintChangeBar();
 864                         if (rit == rb)
 865                                 rp.paintFirst();
 866                         if (rit + 1 == re)
 867                                 rp.paintLast();
 868                         rp.paintText();
 869                 }
 870                 y += rit->descent();
 871                 // Restore, see above
 872                 refreshInside = tmp;
 873         }
 874         lyxerr[Debug::PAINTING] << "." << endl;
 875 }
 876
 877 } // namespace anon
 878
 879
 880 void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 881 {
 882         Painter & pain = bv.painter();
 883         LyXText * const text = bv.text();
 884         bool const select = bv.cursor().selection();
 885
 886         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 887         // Should the whole screen, including insets, be refreshed?
 888         bool repaintAll = select || !vi.singlepar;
 889
 890         if (repaintAll) {
 891                 // Clear background (if not delegated to rows)
 892                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 893                         text->backgroundColor());
 894         }
 895         if (select) {
 896                 text->drawSelection(pi, 0, 0);
 897         }
 898
 899         int yy = vi.y1;
 900         // draw contents
 901         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 902                 refreshInside = repaintAll;
 903                 Paragraph const & par = text->getPar(pit);
 904                 yy += par.ascent();
 905                 paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
 906                 yy += par.descent();
 907         }
 908
 909         // Cache one paragraph above and one below
 910         // Note MV: this cannot be suppressed even for singlepar.
 911         // Try viewing the User Guide Mobius figure
 912
 913         if (vi.p1 > 0) {
 914                 text->redoParagraph(vi.p1 - 1);
 915                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 916                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 917         }
 918
 919         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 920                 text->redoParagraph(vi.p2 + 1);
 921                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 922                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 923         }
 924
 925         // and grey out above (should not happen later)
 926 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 927         if (vi.y1 > 0 && !vi.singlepar)
 928                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 929
 930         // and possibly grey out below
 931 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 932         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 933                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 934 }
 935
 936
 937 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 938 {
 939 //      lyxerr << "  paintTextInset: y: " << y << endl;
 940
 941         y -= text.getPar(0).ascent();
 942         // This flag can not be set from within same inset:
 943         bool repaintAll = refreshInside;
 944         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 945                 y += text.getPar(pit).ascent();
 946                 paintPar(pi, text, pit, x, y, repaintAll);
 947                 y += text.getPar(pit).descent();
 948         }
 949 }