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/FontMetrics.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::docstring;
  46 using lyx::frontend::Painter;
  47 using lyx::frontend::NullPainter;
  48 using lyx::frontend::FontMetrics;
  49
  50 using lyx::char_type;
  51 using lyx::pit_type;
  52 using lyx::pos_type;
  53 using lyx::Point;
  54
  55 using std::endl;
  56 using std::max;
  57 using std::min;
  58 using std::string;
  59
  60
  61 namespace {
  62
  63 /// Flag: do a full redraw of inside text of inset
  64 /// Working variable indicating a full screen refresh
  65 bool refreshInside;
  66
  67 /**
  68  * A class used for painting an individual row of text.
  69  */
  70 class RowPainter {
  71 public:
  72         /// initialise and run painter
  73         RowPainter(PainterInfo & pi, LyXText const & text,
  74                 pit_type pit, Row const & row, int x, int y);
  75
  76         // paint various parts
  77         void paintAppendix();
  78         void paintDepthBar();
  79         void paintChangeBar();
  80         void paintFirst();
  81         void paintLast();
  82         void paintText();
  83
  84 private:
  85         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  86         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  87         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  88         void paintChars(lyx::pos_type & vpos, LyXFont font,
  89                         bool hebrew, bool arabic);
  90         int paintAppendixStart(int y);
  91         void paintFromPos(lyx::pos_type & vpos);
  92         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  93
  94         /// return left margin
  95         int leftMargin() const;
  96
  97         /// return the label font for this row
  98         LyXFont const getLabelFont() const;
  99
 100         /// bufferview to paint on
 101         BufferView & bv_;
 102
 103         /// Painter to use
 104         Painter & pain_;
 105
 106         /// LyXText for the row
 107         LyXText const & text_;
 108         ParagraphList const & pars_;
 109
 110         /// The row to paint
 111         Row const & row_;
 112
 113         /// Row's paragraph
 114         pit_type const pit_;
 115         Paragraph const & par_;
 116
 117         /// is row erased? (change tracking)
 118         bool erased_;
 119
 120         // Looks ugly - is
 121         double const xo_;
 122         int const yo_;    // current baseline
 123         double x_;
 124         int width_;
 125         double separator_;
 126         double hfill_;
 127         double label_hfill_;
 128 };
 129
 130
 131 RowPainter::RowPainter(PainterInfo & pi,
 132         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 133         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 134           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 135           erased_(pi.erased_),
 136           xo_(x), yo_(y), width_(text_.width())
 137 {
 138         RowMetrics m = text_.computeRowMetrics(pit, row_);
 139         x_ = m.x + xo_;
 140
 141         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 142         //row_.dump();
 143
 144         separator_ = m.separator;
 145         hfill_ = m.hfill;
 146         label_hfill_ = m.label_hfill;
 147
 148         BOOST_ASSERT(pit >= 0);
 149         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 150 }
 151
 152
 153 LyXFont const RowPainter::getLabelFont() const
 154 {
 155         return text_.getLabelFont(par_);
 156 }
 157
 158
 159 int RowPainter::leftMargin() const
 160 {
 161         return text_.leftMargin(pit_, row_.pos());
 162 }
 163
 164
 165 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 166 {
 167         InsetBase const * inset = par_.getInset(pos);
 168         BOOST_ASSERT(inset);
 169         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 170         // FIXME: We should always use font, see documentation of
 171         // noFontChange() in insetbase.h.
 172         pi.base.font = inset->noFontChange() ?
 173                 bv_.buffer()->params().getFont() :
 174                 font;
 175         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 176         pi.erased_ = erased_ || isDeletedText(par_, pos);
 177         bv_.coordCache().insets().add(inset, int(x_), yo_);
 178         InsetText const * const in = inset->asTextInset();
 179         // non-wide insets are painted completely. Recursive
 180         bool tmp = refreshInside;
 181         if (!in || !in->Wide()) {
 182                 refreshInside = true;
 183                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 184         }
 185         if (refreshInside)
 186                 inset->drawSelection(pi, int(x_), yo_);
 187         inset->draw(pi, int(x_), yo_);
 188         refreshInside = tmp;
 189         x_ += inset->width();
 190 }
 191
 192
 193 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 194 {
 195         pos_type pos = text_.bidi.vis2log(vpos);
 196
 197         string str;
 198
 199         // first char
 200         char_type c = par_.getChar(pos);
 201         str += c;
 202         ++vpos;
 203
 204         int const width = theFontMetrics(font).width(c);
 205         int dx = 0;
 206
 207         for (pos_type i = pos - 1; i >= 0; --i) {
 208                 c = par_.getChar(i);
 209                 if (!Encodings::isComposeChar_hebrew(c)) {
 210                         if (isPrintableNonspace(c)) {
 211                                 int const width2 =
 212                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 213                                 // dalet / resh
 214                                 dx = (c == 'ø' || c == 'ã')
 215                                         ? width2 - width
 216                                         : (width2 - width) / 2;
 217                         }
 218                         break;
 219                 }
 220         }
 221
 222         // Draw nikud
 223         docstring dstr(str.begin(), str.end());
 224         pain_.text(int(x_) + dx, yo_, dstr, font);
 225 }
 226
 227
 228 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 229 {
 230         pos_type pos = text_.bidi.vis2log(vpos);
 231         string str;
 232
 233         // first char
 234         char_type c = par_.getChar(pos);
 235         c = par_.transformChar(c, pos);
 236         str += c;
 237         ++vpos;
 238
 239         int const width = theFontMetrics(font).width(c);
 240         int dx = 0;
 241
 242         for (pos_type i = pos - 1; i >= 0; --i) {
 243                 c = par_.getChar(i);
 244                 if (!Encodings::isComposeChar_arabic(c)) {
 245                         if (isPrintableNonspace(c)) {
 246                                 int const width2 =
 247                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 248                                 dx = (width2 - width) / 2;
 249                         }
 250                         break;
 251                 }
 252         }
 253         // Draw nikud
 254         docstring dstr(str.begin(), str.end());
 255         pain_.text(int(x_) + dx, yo_, dstr, font);
 256 }
 257
 258
 259 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 260                             bool hebrew, bool arabic)
 261 {
 262         pos_type pos = text_.bidi.vis2log(vpos);
 263         pos_type const end = row_.endpos();
 264         FontSpan const font_span = par_.fontSpan(pos);
 265         Change::Type const prev_change = par_.lookupChange(pos).type;
 266
 267         // first character
 268 #if 0
 269         string str;
 270         str += par_.getChar(pos);
 271 #else
 272         std::vector<char_type> str;
 273         str.push_back(par_.getChar(pos));
 274 #endif
 275         if (arabic) {
 276                 char_type c = str[0];
 277                 str[0] = par_.transformChar(c, pos);
 278         }
 279
 280         // collect as much similar chars as we can
 281         for (++vpos ; vpos < end ; ++vpos) {
 282                 pos = text_.bidi.vis2log(vpos);
 283                 if (pos < font_span.first || pos > font_span.last)
 284                         break;
 285
 286                 // FIXME: change tracking (MG)
 287                 if (Change(prev_change) != par_.lookupChange(pos))
 288                         break;
 289
 290                 char_type c = par_.getChar(pos);
 291
 292                 if (!isPrintableNonspace(c))
 293                         break;
 294
 295                 if (arabic && Encodings::isComposeChar_arabic(c))
 296                         break;
 297
 298                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 299                         break;
 300
 301                 if (arabic)
 302                         c = par_.transformChar(c, pos);
 303
 304 #if 0
 305                 str += c;
 306 #else
 307                 str.push_back(c);
 308 #endif
 309         }
 310
 311         if (prev_change == Change::DELETED)
 312                 font.setColor(LColor::strikeout);
 313         else if (prev_change == Change::INSERTED)
 314                 font.setColor(LColor::newtext);
 315
 316         // Draw text and set the new x position
 317         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 318 #if 0
 319         int width = pain_.text(int(x_), yo_, str, font);
 320 #else
 321         int width = pain_.text(int(x_), yo_, &str[0], str.size(), font);
 322 #endif
 323         x_ += width;
 324 }
 325
 326
 327 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 328 {
 329         if (!lyxrc.mark_foreign_language)
 330                 return;
 331         if (font.language() == latex_language)
 332                 return;
 333         if (font.language() == bv_.buffer()->params().language)
 334                 return;
 335
 336         int const y = yo_ + 1 + desc;
 337         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 338 }
 339
 340
 341 void RowPainter::paintFromPos(pos_type & vpos)
 342 {
 343         pos_type const pos = text_.bidi.vis2log(vpos);
 344         LyXFont orig_font = text_.getFont(par_, pos);
 345
 346         double const orig_x = x_;
 347
 348         if (par_.isInset(pos)) {
 349                 paintInset(pos, orig_font);
 350                 ++vpos;
 351                 paintForeignMark(orig_x, orig_font,
 352                         par_.getInset(pos)->descent());
 353                 return;
 354         }
 355
 356         // usual characters, no insets
 357         char_type const c = par_.getChar(pos);
 358
 359         // special case languages
 360         std::string const & lang = orig_font.language()->lang();
 361         bool const hebrew = lang == "hebrew";
 362         bool const arabic = lang == "arabic" &&
 363                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 364                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 365
 366         // draw as many chars as we can
 367         if ((!hebrew && !arabic)
 368                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 369                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 370                 paintChars(vpos, orig_font, hebrew, arabic);
 371         } else if (hebrew) {
 372                 paintHebrewComposeChar(vpos, orig_font);
 373         } else if (arabic) {
 374                 paintArabicComposeChar(vpos, orig_font);
 375         }
 376
 377         paintForeignMark(orig_x, orig_font);
 378 }
 379
 380
 381 void RowPainter::paintChangeBar()
 382 {
 383         pos_type const start = row_.pos();
 384         pos_type const end = row_.endpos();
 385
 386         if (start == end || !par_.isChanged(start, end))
 387                 return;
 388
 389         int const height = text_.isLastRow(pit_, row_)
 390                 ? row_.ascent()
 391                 : row_.height();
 392
 393         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 394 }
 395
 396
 397 void RowPainter::paintAppendix()
 398 {
 399         if (!par_.params().appendix())
 400                 return;
 401
 402         int y = yo_ - row_.ascent();
 403
 404         if (par_.params().startOfAppendix())
 405                 y += 2 * defaultRowHeight();
 406
 407         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 408         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 409 }
 410
 411
 412 void RowPainter::paintDepthBar()
 413 {
 414         Paragraph::depth_type const depth = par_.getDepth();
 415
 416         if (depth <= 0)
 417                 return;
 418
 419         Paragraph::depth_type prev_depth = 0;
 420         if (!text_.isFirstRow(pit_, row_)) {
 421                 pit_type pit2 = pit_;
 422                 if (row_.pos() == 0)
 423                         --pit2;
 424                 prev_depth = pars_[pit2].getDepth();
 425         }
 426
 427         Paragraph::depth_type next_depth = 0;
 428         if (!text_.isLastRow(pit_, row_)) {
 429                 pit_type pit2 = pit_;
 430                 if (row_.endpos() >= pars_[pit2].size())
 431                         ++pit2;
 432                 next_depth = pars_[pit2].getDepth();
 433         }
 434
 435         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 436                 int const w = nestMargin() / 5;
 437                 int x = int(xo_) + w * i;
 438                 // only consider the changebar space if we're drawing outermost text
 439                 if (text_.isMainText())
 440                         x += changebarMargin();
 441
 442                 int const starty = yo_ - row_.ascent();
 443                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 444
 445                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 446
 447                 if (i > prev_depth)
 448                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 449                 if (i > next_depth)
 450                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 451         }
 452 }
 453
 454
 455 int RowPainter::paintAppendixStart(int y)
 456 {
 457         LyXFont pb_font;
 458         pb_font.setColor(LColor::appendix);
 459         pb_font.decSize();
 460
 461         string const label = lyx::to_utf8(_("Appendix"));
 462         int w = 0;
 463         int a = 0;
 464         int d = 0;
 465         docstring dlab(label.begin(), label.end());
 466         theFontMetrics(pb_font).rectText(dlab, w, a, d);
 467
 468         int const text_start = int(xo_ + (width_ - w) / 2);
 469         int const text_end = text_start + w;
 470
 471         pain_.rectText(text_start, y + d, dlab, pb_font, LColor::none, LColor::none);
 472
 473         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 474         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 475
 476         return 3 * defaultRowHeight();
 477 }
 478
 479
 480 void RowPainter::paintFirst()
 481 {
 482         ParagraphParameters const & parparams = par_.params();
 483
 484         int y_top = 0;
 485
 486         // start of appendix?
 487         if (parparams.startOfAppendix())
 488                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 489
 490         Buffer const & buffer = *bv_.buffer();
 491
 492         LyXLayout_ptr const & layout = par_.layout();
 493
 494         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 495                 if (pit_ != 0) {
 496                         if (layout->latextype == LATEX_PARAGRAPH
 497                                 && !par_.getDepth()) {
 498                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 499                         } else {
 500                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 501                                 if (playout->latextype == LATEX_PARAGRAPH
 502                                         && !pars_[pit_ - 1].getDepth()) {
 503                                         // is it right to use defskip here, too? (AS)
 504                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 505                                 }
 506                         }
 507                 }
 508         }
 509
 510         bool const is_rtl = text_.isRTL(par_);
 511         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 512         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 513
 514         // should we print a label?
 515         if (layout->labeltype >= LABEL_STATIC
 516             && (layout->labeltype != LABEL_STATIC
 517                       || layout->latextype != LATEX_ENVIRONMENT
 518                       || is_seq)) {
 519
 520                 LyXFont const font = getLabelFont();
 521                 FontMetrics const & fm = theFontMetrics(font);
 522
 523                 string const str = par_.getLabelstring();
 524                 if (!str.empty()) {
 525                         double x = x_;
 526                         docstring dstr(str.begin(), str.end());
 527
 528                         // this is special code for the chapter layout. This is
 529                         // printed in an extra row and has a pagebreak at
 530                         // the top.
 531                         if (layout->counter == "chapter") {
 532                                 double spacing_val = 1.0;
 533                                 if (!parparams.spacing().isDefault()) {
 534                                         spacing_val = parparams.spacing().getValue();
 535                                 } else {
 536                                         spacing_val = buffer.params().spacing().getValue();
 537                                 }
 538
 539                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 540
 541                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 542                                         + int(layout->parsep) * defaultRowHeight();
 543
 544                                 if (is_rtl) {
 545                                         x = width_ - leftMargin() -
 546                                                 fm.width(dstr);
 547                                 }
 548
 549                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 550                         } else {
 551                                 string lab = layout->labelsep;
 552                                 docstring dlab(lab.begin(), lab.end());
 553                                 if (is_rtl) {
 554                                         x = width_ - leftMargin()
 555                                                 + fm.width(dlab);
 556                                 } else {
 557                                         x = x_ - fm.width(dlab)
 558                                                 - fm.width(dstr);
 559                                 }
 560
 561                                 pain_.text(int(x), yo_, dstr, font);
 562                         }
 563                 }
 564
 565         // the labels at the top of an environment.
 566         // More or less for bibliography
 567         } else if (is_seq &&
 568                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 569                 layout->labeltype == LABEL_BIBLIO ||
 570                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 571                 LyXFont font = getLabelFont();
 572                 if (!par_.getLabelstring().empty()) {
 573                         string const str = par_.getLabelstring();
 574                         docstring dstr(str.begin(), str.end());
 575                         double spacing_val = 1.0;
 576                         if (!parparams.spacing().isDefault())
 577                                 spacing_val = parparams.spacing().getValue();
 578                         else
 579                                 spacing_val = buffer.params().spacing().getValue();
 580
 581                         FontMetrics const & fm = theFontMetrics(font);
 582
 583                         int const labeladdon = int(fm.maxHeight()
 584                                 * layout->spacing.getValue() * spacing_val);
 585
 586                         int maxdesc =
 587                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 588                                 + (layout->labelbottomsep * defaultRowHeight()));
 589
 590                         double x = x_;
 591                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 592                                 if (is_rtl)
 593                                         x = leftMargin();
 594                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 595                                 x -= fm.width(dstr) / 2;
 596                         } else if (is_rtl) {
 597                                 x = width_ - leftMargin() -     fm.width(dstr);
 598                         }
 599                         pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 600                 }
 601         }
 602 }
 603
 604
 605 void RowPainter::paintLast()
 606 {
 607         bool const is_rtl = text_.isRTL(par_);
 608         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 609
 610         // draw an endlabel
 611         switch (endlabel) {
 612         case END_LABEL_BOX:
 613         case END_LABEL_FILLED_BOX: {
 614                 LyXFont const font = getLabelFont();
 615                 FontMetrics const & fm = theFontMetrics(font);
 616                 int const size = int(0.75 * fm.maxAscent());
 617                 int const y = yo_ - size;
 618                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 619
 620                 if (width_ - int(row_.width()) <= size)
 621                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 622
 623                 if (endlabel == END_LABEL_BOX)
 624                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 625                 else
 626                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 627                 break;
 628         }
 629
 630         case END_LABEL_STATIC: {
 631                 LyXFont font = getLabelFont();
 632                 FontMetrics const & fm = theFontMetrics(font);
 633                 string const & str = par_.layout()->endlabelstring();
 634                 docstring dstr(str.begin(), str.end());
 635                 double const x = is_rtl ?
 636                         x_ - fm.width(dstr)
 637                         : - text_.rightMargin(par_) - row_.width();
 638                 pain_.text(int(x), yo_, dstr, font);
 639                 break;
 640         }
 641
 642         case END_LABEL_NO_LABEL:
 643                 break;
 644         }
 645 }
 646
 647
 648 void RowPainter::paintText()
 649 {
 650         pos_type const end = row_.endpos();
 651         pos_type body_pos = par_.beginOfBody();
 652         if (body_pos > 0 &&
 653                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 654                 body_pos = 0;
 655         }
 656
 657         LyXLayout_ptr const & layout = par_.layout();
 658
 659         bool running_strikeout = false;
 660         bool is_struckout = false;
 661         int last_strikeout_x = 0;
 662
 663         // Use font span to speed things up, see below
 664         FontSpan font_span;
 665         LyXFont font;
 666
 667         for (pos_type vpos = row_.pos(); vpos < end; ) {
 668                 if (x_ > bv_.workWidth())
 669                         break;
 670
 671                 pos_type const pos = text_.bidi.vis2log(vpos);
 672
 673                 if (pos >= par_.size()) {
 674                         ++vpos;
 675                         continue;
 676                 }
 677
 678                 // Use font span to speed things up, see above
 679                 if (vpos < font_span.first || vpos > font_span.last) {
 680                         font_span = par_.fontSpan(vpos);
 681                         font = text_.getFont(par_, vpos);
 682                 }
 683
 684                 const int width_pos =
 685                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 686
 687                 if (x_ + width_pos < 0) {
 688                         x_ += width_pos;
 689                         ++vpos;
 690                         continue;
 691                 }
 692
 693                 is_struckout = isDeletedText(par_, pos);
 694
 695                 if (is_struckout && !running_strikeout) {
 696                         running_strikeout = true;
 697                         last_strikeout_x = int(x_);
 698                 }
 699
 700                 bool const highly_editable_inset = par_.isInset(pos)
 701                         && isHighlyEditableInset(par_.getInset(pos));
 702
 703                 // If we reach the end of a struck out range, paint it.
 704                 // We also don't paint across things like tables
 705                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 706                         // Calculate 1/3 height of the buffer's default font
 707                         FontMetrics const & fm
 708                                 = theFontMetrics(bv_.buffer()->params().getFont());
 709                         int const middle = yo_ - fm.maxAscent() / 3;
 710                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 711                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 712                         running_strikeout = false;
 713                 }
 714
 715                 if (body_pos > 0 && pos == body_pos - 1) {
 716                         string lab = layout->labelsep;
 717                         docstring dlab(lab.begin(), lab.end());
 718                         int const lwidth
 719                                 = theFontMetrics(getLabelFont()).width(dlab);
 720
 721                         x_ += label_hfill_ + lwidth - width_pos;
 722                 }
 723
 724                 if (par_.isHfill(pos)) {
 725                         x_ += 1;
 726
 727                         int const y0 = yo_;
 728                         int const y1 = y0 - defaultRowHeight() / 2;
 729
 730                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 731
 732                         if (hfillExpansion(par_, row_, pos)) {
 733                                 int const y2 = (y0 + y1) / 2;
 734
 735                                 if (pos >= body_pos) {
 736                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 737                                                   LColor::added_space,
 738                                                   Painter::line_onoffdash);
 739                                         x_ += hfill_;
 740                                 } else {
 741                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 742                                                   LColor::added_space,
 743                                                   Painter::line_onoffdash);
 744                                         x_ += label_hfill_;
 745                                 }
 746                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 747                         }
 748                         x_ += 2;
 749                         ++vpos;
 750                 } else if (par_.isSeparator(pos)) {
 751                         x_ += width_pos;
 752                         if (pos >= body_pos)
 753                                 x_ += separator_;
 754                         ++vpos;
 755                 } else {
 756                         paintFromPos(vpos);
 757                 }
 758         }
 759
 760         // if we reach the end of a struck out range, paint it
 761         if (running_strikeout) {
 762                 // calculate 1/3 height of the buffer's default font
 763                 FontMetrics const & fm
 764                         = theFontMetrics(bv_.buffer()->params().getFont());
 765                 int const middle = yo_ - fm.maxAscent() / 3;
 766                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 767                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 768                 running_strikeout = false;
 769         }
 770 }
 771
 772
 773 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 774         int x, int y)
 775 {
 776         boost::crc_32_type crc;
 777         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 778                 const unsigned char b[] = { par.getChar(i) };
 779                 crc.process_bytes(b, 1);
 780         }
 781         const unsigned char b[] = { x, y, row.width() };
 782         crc.process_bytes(b, 3);
 783         return crc.checksum();
 784 }
 785
 786
 787 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 788         RowList::const_iterator rit, LyXText const & text)
 789 {
 790         // Is there a cursor on this row (or inside inset on row)
 791         LCursor & cur = pi.base.bv->cursor();
 792         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 793                 CursorSlice const & sl = cur[d];
 794                 if (sl.text() == &text
 795                     && sl.pit() == pit
 796                     && sl.pos() >= rit->pos()
 797                     && sl.pos() <= rit->endpos())
 798                         return true;
 799         }
 800         return false;
 801 }
 802
 803
 804 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 805         RowList::const_iterator rit, LyXText const & text)
 806 {
 807         // Is there a cursor inside an inset on this row, and is this inset
 808         // the only "character" on this row
 809         LCursor & cur = pi.base.bv->cursor();
 810         if (rit->pos() + 1 != rit->endpos())
 811                 return false;
 812         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 813                 CursorSlice const & sl = cur[d];
 814                 if (sl.text() == &text
 815                     && sl.pit() == pit
 816                     && sl.pos() == rit->pos())
 817                         return d < cur.depth() - 1;
 818         }
 819         return false;
 820 }
 821
 822
 823 void paintPar
 824         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 825          bool repaintAll)
 826 {
 827 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 828         static NullPainter nop;
 829         static PainterInfo nullpi(pi.base.bv, nop);
 830         int const ww = pi.base.bv->workHeight();
 831
 832         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 833
 834         Paragraph const & par = text.paragraphs()[pit];
 835         if (par.rows().empty())
 836                 return;
 837
 838         RowList::const_iterator const rb = par.rows().begin();
 839         RowList::const_iterator const re = par.rows().end();
 840
 841         y -= rb->ascent();
 842         lyx::size_type rowno(0);
 843         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 844                 y += rit->ascent();
 845                 // Allow setting of refreshInside for nested insets in
 846                 // this row only
 847                 bool tmp = refreshInside;
 848
 849                 // Row signature; has row changed since last paint?
 850                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 851                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 852
 853                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 854                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 855                         text);
 856
 857                 // If this is the only object on the row, we can make it wide
 858                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 859                         InsetBase const * const in = par.getInset(i);
 860                         if (in) {
 861                                 InsetText const * const t = in->asTextInset();
 862                                 if (t)
 863                                         t->Wide() = in_inset_alone_on_row;
 864                         }
 865                 }
 866
 867                 // If selection is on, the current row signature differs
 868                 // from cache, or cursor is inside an inset _on this row_,
 869                 // then paint the row
 870                 if (repaintAll || row_has_changed || cursor_on_row) {
 871                         // Add to row signature cache
 872                         par.rowSignature()[rowno] = row_sig;
 873
 874                         bool const inside = (y + rit->descent() >= 0
 875                                        && y - rit->ascent() < ww);
 876                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 877                         // Clear background of this row
 878                         // (if paragraph background was not cleared)
 879                         if (!repaintAll &&
 880                             (!in_inset_alone_on_row || row_has_changed)) {
 881                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 882                                     text.maxwidth_, rit->height(),
 883                                     text.backgroundColor());
 884                                 // If outer row has changed, force nested
 885                                 // insets to repaint completely
 886                                 if (row_has_changed)
 887                                         refreshInside = true;
 888                         }
 889
 890                         // Instrumentation for testing row cache (see also
 891                         // 12 lines lower):
 892                         if (text.isMainText())
 893                                 lyxerr[Debug::PAINTING] << "#";
 894                         else
 895                                 lyxerr[Debug::PAINTING] << "[" <<
 896                                     repaintAll << row_has_changed <<
 897                                     cursor_on_row << "]";
 898                         rp.paintAppendix();
 899                         rp.paintDepthBar();
 900                         rp.paintChangeBar();
 901                         if (rit == rb)
 902                                 rp.paintFirst();
 903                         if (rit + 1 == re)
 904                                 rp.paintLast();
 905                         rp.paintText();
 906                 }
 907                 y += rit->descent();
 908                 // Restore, see above
 909                 refreshInside = tmp;
 910         }
 911         lyxerr[Debug::PAINTING] << "." << endl;
 912 }
 913
 914 } // namespace anon
 915
 916
 917 void paintText(BufferView & bv, ViewMetricsInfo const & vi,
 918                Painter & pain)
 919 {
 920         LyXText & text = bv.buffer()->text();
 921         bool const select = bv.cursor().selection();
 922
 923         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 924         // Should the whole screen, including insets, be refreshed?
 925         bool repaintAll = select || !vi.singlepar;
 926
 927         if (repaintAll) {
 928                 // Clear background (if not delegated to rows)
 929                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 930                         text.backgroundColor());
 931         }
 932         if (select) {
 933                 text.drawSelection(pi, 0, 0);
 934         }
 935
 936         int yy = vi.y1;
 937         // draw contents
 938         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 939                 refreshInside = repaintAll;
 940                 Paragraph const & par = text.getPar(pit);
 941                 yy += par.ascent();
 942                 paintPar(pi, text, pit, 0, yy, repaintAll);
 943                 yy += par.descent();
 944         }
 945
 946         // Cache one paragraph above and one below
 947         // Note MV: this cannot be suppressed even for singlepar.
 948         // Try viewing the User Guide Mobius figure
 949
 950         if (vi.p1 > 0) {
 951                 text.redoParagraph(vi.p1 - 1);
 952                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 953                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 954         }
 955
 956         if (vi.p2 < lyx::pit_type(text.paragraphs().size()) - 1) {
 957                 text.redoParagraph(vi.p2 + 1);
 958                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 959                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 960         }
 961
 962         // and grey out above (should not happen later)
 963 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 964         if (vi.y1 > 0 && !vi.singlepar)
 965                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 966
 967         // and possibly grey out below
 968 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 969         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 970                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 971 }
 972
 973
 974 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 975 {
 976 //      lyxerr << "  paintTextInset: y: " << y << endl;
 977
 978         y -= text.getPar(0).ascent();
 979         // This flag can not be set from within same inset:
 980         bool repaintAll = refreshInside;
 981         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 982                 y += text.getPar(pit).ascent();
 983                 paintPar(pi, text, pit, x, y, repaintAll);
 984                 y += text.getPar(pit).descent();
 985         }
 986 }