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::pos_type;
  46 using lyx::pit_type;
  47
  48 using std::endl;
  49 using std::max;
  50 using std::min;
  51 using std::string;
  52
  53
  54 namespace {
  55
  56 /**
  57  * A class used for painting an individual row of text.
  58  */
  59 class RowPainter {
  60 public:
  61         /// initialise and run painter
  62         RowPainter(PainterInfo & pi, LyXText const & text,
  63                 pit_type pit, Row const & row, int x, int y);
  64
  65         // paint various parts
  66         void paintAppendix();
  67         void paintDepthBar();
  68         void paintChangeBar();
  69         void paintFirst();
  70         void paintLast();
  71         void paintText();
  72
  73 private:
  74         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  75         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  76         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  77         void paintChars(lyx::pos_type & vpos, LyXFont font,
  78                         bool hebrew, bool arabic);
  79         int paintAppendixStart(int y);
  80         void paintFromPos(lyx::pos_type & vpos);
  81         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  82
  83         /// return left margin
  84         int leftMargin() const;
  85
  86         /// return the label font for this row
  87         LyXFont const getLabelFont() const;
  88
  89         /// bufferview to paint on
  90         BufferView const & bv_;
  91
  92         /// Painter to use
  93         Painter & pain_;
  94
  95         /// LyXText for the row
  96         LyXText const & text_;
  97         ParagraphList const & pars_;
  98
  99         /// The row to paint
 100         Row const & row_;
 101
 102         /// Row's paragraph
 103         pit_type const pit_;
 104         Paragraph const & par_;
 105
 106         /// is row erased? (change tracking)
 107         bool erased_;
 108
 109         // Looks ugly - is
 110         double const xo_;
 111         int const yo_;    // current baseline
 112         double x_;
 113         int width_;
 114         double separator_;
 115         double hfill_;
 116         double label_hfill_;
 117 };
 118
 119
 120 RowPainter::RowPainter(PainterInfo & pi,
 121         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 122         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 123           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 124           erased_(pi.erased_),
 125           xo_(x), yo_(y), width_(text_.width())
 126 {
 127         RowMetrics m = text_.computeRowMetrics(pit, row_);
 128         x_ = m.x + xo_;
 129
 130         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 131         //row_.dump();
 132
 133         separator_ = m.separator;
 134         hfill_ = m.hfill;
 135         label_hfill_ = m.label_hfill;
 136
 137         BOOST_ASSERT(pit >= 0);
 138         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 139 }
 140
 141
 142 LyXFont const RowPainter::getLabelFont() const
 143 {
 144         return text_.getLabelFont(par_);
 145 }
 146
 147
 148 int RowPainter::leftMargin() const
 149 {
 150         return text_.leftMargin(pit_, row_.pos());
 151 }
 152
 153
 154 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 155 {
 156         InsetBase const * inset = par_.getInset(pos);
 157         BOOST_ASSERT(inset);
 158         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 159         // FIXME: We should always use font, see documentation of
 160         // noFontChange() in insetbase.h.
 161         pi.base.font = inset->noFontChange() ?
 162                 bv_.buffer()->params().getLyXTextClass().defaultfont() :
 163                 font;
 164         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 165         pi.erased_ = erased_ || isDeletedText(par_, pos);
 166         theCoords.insets().add(inset, int(x_), yo_);
 167         inset->drawSelection(pi, int(x_), yo_);
 168         inset->draw(pi, int(x_), yo_);
 169         x_ += inset->width();
 170 }
 171
 172
 173 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 174 {
 175         pos_type pos = text_.bidi.vis2log(vpos);
 176
 177         string str;
 178
 179         // first char
 180         char c = par_.getChar(pos);
 181         str += c;
 182         ++vpos;
 183
 184         int const width = font_metrics::width(c, font);
 185         int dx = 0;
 186
 187         for (pos_type i = pos - 1; i >= 0; --i) {
 188                 c = par_.getChar(i);
 189                 if (!Encodings::IsComposeChar_hebrew(c)) {
 190                         if (IsPrintableNonspace(c)) {
 191                                 int const width2 =
 192                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 193                                 // dalet / resh
 194                                 dx = (c == 'ø' || c == 'ã')
 195                                         ? width2 - width
 196                                         : (width2 - width) / 2;
 197                         }
 198                         break;
 199                 }
 200         }
 201
 202         // Draw nikud
 203         pain_.text(int(x_) + dx, yo_, str, font);
 204 }
 205
 206
 207 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 208 {
 209         pos_type pos = text_.bidi.vis2log(vpos);
 210         string str;
 211
 212         // first char
 213         char c = par_.getChar(pos);
 214         c = par_.transformChar(c, pos);
 215         str += c;
 216         ++vpos;
 217
 218         int const width = font_metrics::width(c, font);
 219         int dx = 0;
 220
 221         for (pos_type i = pos - 1; i >= 0; --i) {
 222                 c = par_.getChar(i);
 223                 if (!Encodings::IsComposeChar_arabic(c)) {
 224                         if (IsPrintableNonspace(c)) {
 225                                 int const width2 =
 226                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 227                                 dx = (width2 - width) / 2;
 228                         }
 229                         break;
 230                 }
 231         }
 232         // Draw nikud
 233         pain_.text(int(x_) + dx, yo_, str, font);
 234 }
 235
 236
 237 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 238                             bool hebrew, bool arabic)
 239 {
 240         pos_type pos = text_.bidi.vis2log(vpos);
 241         pos_type const end = row_.endpos();
 242         FontSpan const font_span = par_.fontSpan(pos);
 243         Change::Type const prev_change = par_.lookupChange(pos);
 244
 245         // first character
 246         string str;
 247         str += par_.getChar(pos);
 248         if (arabic) {
 249                 unsigned char c = str[0];
 250                 str[0] = par_.transformChar(c, pos);
 251         }
 252
 253         // collect as much similar chars as we can
 254         for (++vpos ; vpos < end ; ++vpos) {
 255                 pos = text_.bidi.vis2log(vpos);
 256                 if (pos < font_span.first || pos > font_span.last)
 257                         break;
 258
 259                 if (prev_change != par_.lookupChange(pos))
 260                         break;
 261
 262                 char c = par_.getChar(pos);
 263
 264                 if (!IsPrintableNonspace(c))
 265                         break;
 266
 267                 if (arabic && Encodings::IsComposeChar_arabic(c))
 268                         break;
 269
 270                 if (hebrew && Encodings::IsComposeChar_hebrew(c))
 271                         break;
 272
 273                 if (arabic)
 274                         c = par_.transformChar(c, pos);
 275
 276                 str += c;
 277         }
 278
 279         if (prev_change == Change::DELETED)
 280                 font.setColor(LColor::strikeout);
 281         else if (prev_change == Change::INSERTED)
 282                 font.setColor(LColor::newtext);
 283
 284         // Draw text and set the new x position
 285         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 286         pain_.text(int(x_), yo_, str, font);
 287         x_ += font_metrics::width(str, font);
 288 }
 289
 290
 291 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 292 {
 293         if (!lyxrc.mark_foreign_language)
 294                 return;
 295         if (font.language() == latex_language)
 296                 return;
 297         if (font.language() == bv_.buffer()->params().language)
 298                 return;
 299
 300         int const y = yo_ + 1 + desc;
 301         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 302 }
 303
 304
 305 void RowPainter::paintFromPos(pos_type & vpos)
 306 {
 307         pos_type const pos = text_.bidi.vis2log(vpos);
 308         LyXFont orig_font = text_.getFont(par_, pos);
 309         text_.applyOuterFont(orig_font);
 310
 311         double const orig_x = x_;
 312
 313         if (par_.isInset(pos)) {
 314                 paintInset(pos, orig_font);
 315                 ++vpos;
 316                 paintForeignMark(orig_x, orig_font,
 317                         par_.getInset(pos)->descent());
 318                 return;
 319         }
 320
 321         // usual characters, no insets
 322         char const c = par_.getChar(pos);
 323
 324         // special case languages
 325         std::string const & lang = orig_font.language()->lang();
 326         bool const hebrew = lang == "hebrew";
 327         bool const arabic = lang == "arabic" &&
 328                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 329                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 330
 331         // draw as many chars as we can
 332         if ((!hebrew && !arabic)
 333                 || (hebrew && !Encodings::IsComposeChar_hebrew(c))
 334                 || (arabic && !Encodings::IsComposeChar_arabic(c))) {
 335                 paintChars(vpos, orig_font, hebrew, arabic);
 336         } else if (hebrew) {
 337                 paintHebrewComposeChar(vpos, orig_font);
 338         } else if (arabic) {
 339                 paintArabicComposeChar(vpos, orig_font);
 340         }
 341
 342         paintForeignMark(orig_x, orig_font);
 343 }
 344
 345
 346 void RowPainter::paintChangeBar()
 347 {
 348         pos_type const start = row_.pos();
 349         pos_type const end = row_.endpos();
 350
 351         if (start == end || !par_.isChanged(start, end - 1))
 352                 return;
 353
 354         int const height = text_.isLastRow(pit_, row_)
 355                 ? row_.ascent()
 356                 : row_.height();
 357
 358         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 359 }
 360
 361
 362 void RowPainter::paintAppendix()
 363 {
 364         if (!par_.params().appendix())
 365                 return;
 366
 367         int y = yo_ - row_.ascent();
 368
 369         if (par_.params().startOfAppendix())
 370                 y += 2 * defaultRowHeight();
 371
 372         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 373         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 374 }
 375
 376
 377 void RowPainter::paintDepthBar()
 378 {
 379         Paragraph::depth_type const depth = par_.getDepth();
 380
 381         if (depth <= 0)
 382                 return;
 383
 384         Paragraph::depth_type prev_depth = 0;
 385         if (!text_.isFirstRow(pit_, row_)) {
 386                 pit_type pit2 = pit_;
 387                 if (row_.pos() == 0)
 388                         --pit2;
 389                 prev_depth = pars_[pit2].getDepth();
 390         }
 391
 392         Paragraph::depth_type next_depth = 0;
 393         if (!text_.isLastRow(pit_, row_)) {
 394                 pit_type pit2 = pit_;
 395                 if (row_.endpos() >= pars_[pit2].size())
 396                         ++pit2;
 397                 next_depth = pars_[pit2].getDepth();
 398         }
 399
 400         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 401                 int const w = nestMargin() / 5;
 402                 int x = int(xo_) + w * i;
 403                 // only consider the changebar space if we're drawing outermost text
 404                 if (text_.isMainText())
 405                         x += changebarMargin();
 406
 407                 int const starty = yo_ - row_.ascent();
 408                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 409
 410                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 411
 412                 if (i > prev_depth)
 413                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 414                 if (i > next_depth)
 415                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 416         }
 417 }
 418
 419
 420 int RowPainter::paintAppendixStart(int y)
 421 {
 422         LyXFont pb_font;
 423         pb_font.setColor(LColor::appendix);
 424         pb_font.decSize();
 425
 426         string const label = _("Appendix");
 427         int w = 0;
 428         int a = 0;
 429         int d = 0;
 430         font_metrics::rectText(label, pb_font, w, a, d);
 431
 432         int const text_start = int(xo_ + (width_ - w) / 2);
 433         int const text_end = text_start + w;
 434
 435         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 436
 437         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 438         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 439
 440         return 3 * defaultRowHeight();
 441 }
 442
 443
 444 void RowPainter::paintFirst()
 445 {
 446         ParagraphParameters const & parparams = par_.params();
 447
 448         int y_top = 0;
 449
 450         // start of appendix?
 451         if (parparams.startOfAppendix())
 452                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 453
 454         Buffer const & buffer = *bv_.buffer();
 455
 456         LyXLayout_ptr const & layout = par_.layout();
 457
 458         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 459                 if (pit_ != 0) {
 460                         if (layout->latextype == LATEX_PARAGRAPH
 461                                 && !par_.getDepth()) {
 462                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 463                         } else {
 464                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 465                                 if (playout->latextype == LATEX_PARAGRAPH
 466                                         && !pars_[pit_ - 1].getDepth()) {
 467                                         // is it right to use defskip here, too? (AS)
 468                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 469                                 }
 470                         }
 471                 }
 472         }
 473
 474         bool const is_rtl = text_.isRTL(par_);
 475         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 476         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 477
 478         // should we print a label?
 479         if (layout->labeltype >= LABEL_STATIC
 480             && (layout->labeltype != LABEL_STATIC
 481                       || layout->latextype != LATEX_ENVIRONMENT
 482                       || is_seq)) {
 483
 484                 LyXFont const font = getLabelFont();
 485                 string const str = par_.getLabelstring();
 486                 if (!str.empty()) {
 487                         double x = x_;
 488
 489                         // this is special code for the chapter layout. This is
 490                         // printed in an extra row and has a pagebreak at
 491                         // the top.
 492                         if (layout->counter == "chapter") {
 493                                 double spacing_val = 1.0;
 494                                 if (!parparams.spacing().isDefault()) {
 495                                         spacing_val = parparams.spacing().getValue();
 496                                 } else {
 497                                         spacing_val = buffer.params().spacing().getValue();
 498                                 }
 499
 500                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 501
 502                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 503                                         + int(layout->parsep) * defaultRowHeight();
 504
 505                                 if (is_rtl) {
 506                                         x = width_ - leftMargin() -
 507                                                 font_metrics::width(str, font);
 508                                 }
 509
 510                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 511                         } else {
 512                                 if (is_rtl) {
 513                                         x = width_ - leftMargin()
 514                                                 + font_metrics::width(layout->labelsep, font);
 515                                 } else {
 516                                         x = x_ - font_metrics::width(layout->labelsep, font)
 517                                                 - font_metrics::width(str, font);
 518                                 }
 519
 520                                 pain_.text(int(x), yo_, str, font);
 521                         }
 522                 }
 523
 524         // the labels at the top of an environment.
 525         // More or less for bibliography
 526         } else if (is_seq &&
 527                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 528                 layout->labeltype == LABEL_BIBLIO ||
 529                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 530                 LyXFont font = getLabelFont();
 531                 if (!par_.getLabelstring().empty()) {
 532                         string const str = par_.getLabelstring();
 533                         double spacing_val = 1.0;
 534                         if (!parparams.spacing().isDefault())
 535                                 spacing_val = parparams.spacing().getValue();
 536                         else
 537                                 spacing_val = buffer.params().spacing().getValue();
 538
 539                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 540
 541                         int maxdesc =
 542                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 543                                 + (layout->labelbottomsep * defaultRowHeight()));
 544
 545                         double x = x_;
 546                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 547                                 if (is_rtl)
 548                                         x = leftMargin();
 549                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 550                                 x -= font_metrics::width(str, font) / 2;
 551                         } else if (is_rtl) {
 552                                 x = width_ - leftMargin() -
 553                                         font_metrics::width(str, font);
 554                         }
 555                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 556                 }
 557         }
 558 }
 559
 560
 561 void RowPainter::paintLast()
 562 {
 563         bool const is_rtl = text_.isRTL(par_);
 564         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 565
 566         // draw an endlabel
 567         switch (endlabel) {
 568         case END_LABEL_BOX:
 569         case END_LABEL_FILLED_BOX: {
 570                 LyXFont const font = getLabelFont();
 571                 int const size = int(0.75 * font_metrics::maxAscent(font));
 572                 int const y = yo_ - size;
 573                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 574
 575                 if (width_ - int(row_.width()) <= size)
 576                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 577
 578                 if (endlabel == END_LABEL_BOX)
 579                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 580                 else
 581                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 582                 break;
 583         }
 584
 585         case END_LABEL_STATIC: {
 586                 LyXFont font = getLabelFont();
 587                 string const & str = par_.layout()->endlabelstring();
 588                 double const x = is_rtl ?
 589                         x_ - font_metrics::width(str, font)
 590                         : - text_.rightMargin(par_) - row_.width();
 591                 pain_.text(int(x), yo_, str, font);
 592                 break;
 593         }
 594
 595         case END_LABEL_NO_LABEL:
 596                 break;
 597         }
 598 }
 599
 600
 601 void RowPainter::paintText()
 602 {
 603         pos_type const end = row_.endpos();
 604         pos_type body_pos = par_.beginOfBody();
 605         if (body_pos > 0 &&
 606                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 607                 body_pos = 0;
 608         }
 609
 610         LyXLayout_ptr const & layout = par_.layout();
 611
 612         bool running_strikeout = false;
 613         bool is_struckout = false;
 614         int last_strikeout_x = 0;
 615
 616         // Use font span to speed things up, see below
 617         FontSpan font_span;
 618         LyXFont font;
 619
 620         for (pos_type vpos = row_.pos(); vpos < end; ) {
 621                 if (x_ > bv_.workWidth())
 622                         break;
 623
 624                 pos_type const pos = text_.bidi.vis2log(vpos);
 625
 626                 if (pos >= par_.size()) {
 627                         ++vpos;
 628                         continue;
 629                 }
 630
 631                 // Use font span to speed things up, see above
 632                 if (vpos < font_span.first || vpos > font_span.last) {
 633                         font_span = par_.fontSpan(vpos);
 634                         font = text_.getFont(par_, vpos);
 635                 }
 636
 637                 const int width_pos =
 638                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 639
 640                 if (x_ + width_pos < 0) {
 641                         x_ += width_pos;
 642                         ++vpos;
 643                         continue;
 644                 }
 645
 646                 is_struckout = isDeletedText(par_, pos);
 647
 648                 if (is_struckout && !running_strikeout) {
 649                         running_strikeout = true;
 650                         last_strikeout_x = int(x_);
 651                 }
 652
 653                 bool const highly_editable_inset = par_.isInset(pos)
 654                         && isHighlyEditableInset(par_.getInset(pos));
 655
 656                 // If we reach the end of a struck out range, paint it.
 657                 // We also don't paint across things like tables
 658                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 659                         // Calculate 1/3 height of the buffer's default font
 660                         int const middle =
 661                                 yo_ - font_metrics::maxAscent(text_.defaultfont_) / 3;
 662                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 663                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 664                         running_strikeout = false;
 665                 }
 666
 667                 if (body_pos > 0 && pos == body_pos - 1) {
 668                         int const lwidth = font_metrics::width(layout->labelsep,
 669                                 getLabelFont());
 670
 671                         x_ += label_hfill_ + lwidth - width_pos;
 672                 }
 673
 674                 if (par_.isHfill(pos)) {
 675                         x_ += 1;
 676
 677                         int const y0 = yo_;
 678                         int const y1 = y0 - defaultRowHeight() / 2;
 679
 680                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 681
 682                         if (hfillExpansion(par_, row_, pos)) {
 683                                 int const y2 = (y0 + y1) / 2;
 684
 685                                 if (pos >= body_pos) {
 686                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 687                                                   LColor::added_space,
 688                                                   Painter::line_onoffdash);
 689                                         x_ += hfill_;
 690                                 } else {
 691                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 692                                                   LColor::added_space,
 693                                                   Painter::line_onoffdash);
 694                                         x_ += label_hfill_;
 695                                 }
 696                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 697                         }
 698                         x_ += 2;
 699                         ++vpos;
 700                 } else if (par_.isSeparator(pos)) {
 701                         x_ += width_pos;
 702                         if (pos >= body_pos)
 703                                 x_ += separator_;
 704                         ++vpos;
 705                 } else {
 706                         paintFromPos(vpos);
 707                 }
 708         }
 709
 710         // if we reach the end of a struck out range, paint it
 711         if (running_strikeout) {
 712                 // calculate 1/3 height of the buffer's default font
 713                 int const middle =
 714                         yo_ - font_metrics::maxAscent(text_.defaultfont_) / 3;
 715                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 716                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 717                 running_strikeout = false;
 718         }
 719 }
 720
 721
 722 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par)
 723 {
 724         boost::crc_32_type crc;
 725         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 726                 const unsigned char b[] = { par.getChar(i) };
 727                 crc.process_bytes(b, 1);
 728         }
 729         return crc.checksum();
 730 }
 731
 732
 733 bool isCursorOnRow(PainterInfo & pi, pit_type pit, RowList::const_iterator rit)
 734 {
 735         LCursor & cur = pi.base.bv->cursor();
 736         for (lyx::size_type d = 0; d < cur.depth(); d++)
 737                 if (cur[d].pit() == pit
 738                     && cur[d].pos() >= rit->pos()
 739                     && cur[d].pos() <= rit->endpos())
 740                         return true;
 741         return false;
 742 }
 743
 744
 745 void paintPar
 746         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 747          bool repaintAll)
 748 {
 749 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 750         static NullPainter nop;
 751         static PainterInfo nullpi(pi.base.bv, nop);
 752         int const ww = pi.base.bv->workHeight();
 753
 754         Paragraph const & par = text.paragraphs()[pit];
 755
 756         RowList::const_iterator const rb = par.rows().begin();
 757         RowList::const_iterator const re = par.rows().end();
 758         theCoords.parPos()[&text][pit] = Point(x, y);
 759
 760         y -= rb->ascent();
 761         lyx::size_type rowno(0);
 762         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 763                 y += rit->ascent();
 764
 765                 // Row signature; has row changed since last paint?
 766                 lyx::size_type const row_sig = calculateRowSignature(*rit, par);
 767
 768                 bool cursor_on_row = isCursorOnRow(pi, pit, rit);
 769
 770                 // If selection is on, the current row signature differs from
 771                 // from cache, or cursor is inside an inset _on this row_,
 772                 // then paint the row
 773                 if (repaintAll || par.rowSignature()[rowno] != row_sig
 774                             || cursor_on_row) {
 775                         // Add to row signature cache
 776                         par.rowSignature()[rowno] = row_sig;
 777
 778                         bool const inside = (y + rit->descent() >= 0
 779                                        && y - rit->ascent() < ww);
 780                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 781                         // Clear background of this row
 782                         // (if paragraph background was not cleared)
 783                         if (!repaintAll) {
 784                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 785                                     pi.base.bv->workWidth(), rit->height(),
 786                                     text.backgroundColor());
 787                         }
 788
 789                         // Instrumentation for testing row cache (see also
 790                         // 12 lines lower):
 791                         //lyxerr << "#";
 792                         rp.paintAppendix();
 793                         rp.paintDepthBar();
 794                         rp.paintChangeBar();
 795                         if (rit == rb)
 796                                 rp.paintFirst();
 797                         if (rit + 1 == re)
 798                                 rp.paintLast();
 799                         rp.paintText();
 800                 }
 801                 y += rit->descent();
 802         }
 803         //lyxerr << "." << endl;
 804 }
 805
 806 } // namespace anon
 807
 808
 809 void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 810 {
 811         Painter & pain = bv.painter();
 812         LyXText * const text = bv.text();
 813         bool const select = bv.cursor().selection();
 814
 815         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 816         if (select || !vi.singlepar) {
 817                 // Clear background (Delegated to rows if no selection)
 818                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 819                         text->backgroundColor());
 820         }
 821         if (select) {
 822                 text->drawSelection(pi, 0, 0);
 823         }
 824
 825         int yy = vi.y1;
 826         // draw contents
 827         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 828                 Paragraph const & par = text->getPar(pit);
 829                 yy += par.ascent();
 830                 paintPar(pi, *bv.text(), pit, 0, yy, select || !vi.singlepar);
 831                 yy += par.descent();
 832         }
 833
 834         // Cache one paragraph above and one below
 835         // Note MV: this cannot be suppressed even for singlepar.
 836         // Try viewing the User Guide Mobius figure
 837
 838         if (vi.p1 > 0) {
 839                 text->redoParagraph(vi.p1 - 1);
 840                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 841                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 842         }
 843
 844         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 845                 text->redoParagraph(vi.p2 + 1);
 846                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 847                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 848         }
 849
 850         // and grey out above (should not happen later)
 851 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 852         if (vi.y1 > 0 && !vi.singlepar)
 853                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 854
 855         // and possibly grey out below
 856 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 857         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 858                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 859 }
 860
 861
 862 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 863 {
 864 //      lyxerr << "  paintTextInset: y: " << y << endl;
 865
 866         y -= text.getPar(0).ascent();
 867         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 868                 y += text.getPar(pit).ascent();
 869                 paintPar(pi, text, pit, x, y, true);
 870                 y += text.getPar(pit).descent();
 871         }
 872 }