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().getFont() :
 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         InsetText const * const in = inset->asTextInset();
 168         // non-wide insets are painted completely. Recursive
 169         bool tmp = bv_.repaintAll();
 170         if (!in || !in->Wide()) {
 171                 bv_.repaintAll(true);
 172                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 173         }
 174         if (bv_.repaintAll())
 175                 inset->drawSelection(pi, int(x_), yo_);
 176         inset->draw(pi, int(x_), yo_);
 177         bv_.repaintAll(tmp);
 178         x_ += inset->width();
 179 }
 180
 181
 182 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 183 {
 184         pos_type pos = text_.bidi.vis2log(vpos);
 185
 186         string str;
 187
 188         // first char
 189         char c = par_.getChar(pos);
 190         str += c;
 191         ++vpos;
 192
 193         int const width = font_metrics::width(c, font);
 194         int dx = 0;
 195
 196         for (pos_type i = pos - 1; i >= 0; --i) {
 197                 c = par_.getChar(i);
 198                 if (!Encodings::IsComposeChar_hebrew(c)) {
 199                         if (IsPrintableNonspace(c)) {
 200                                 int const width2 =
 201                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 202                                 // dalet / resh
 203                                 dx = (c == 'ø' || c == 'ã')
 204                                         ? width2 - width
 205                                         : (width2 - width) / 2;
 206                         }
 207                         break;
 208                 }
 209         }
 210
 211         // Draw nikud
 212         pain_.text(int(x_) + dx, yo_, str, font);
 213 }
 214
 215
 216 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 217 {
 218         pos_type pos = text_.bidi.vis2log(vpos);
 219         string str;
 220
 221         // first char
 222         char c = par_.getChar(pos);
 223         c = par_.transformChar(c, pos);
 224         str += c;
 225         ++vpos;
 226
 227         int const width = font_metrics::width(c, font);
 228         int dx = 0;
 229
 230         for (pos_type i = pos - 1; i >= 0; --i) {
 231                 c = par_.getChar(i);
 232                 if (!Encodings::IsComposeChar_arabic(c)) {
 233                         if (IsPrintableNonspace(c)) {
 234                                 int const width2 =
 235                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 236                                 dx = (width2 - width) / 2;
 237                         }
 238                         break;
 239                 }
 240         }
 241         // Draw nikud
 242         pain_.text(int(x_) + dx, yo_, str, font);
 243 }
 244
 245
 246 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 247                             bool hebrew, bool arabic)
 248 {
 249         pos_type pos = text_.bidi.vis2log(vpos);
 250         pos_type const end = row_.endpos();
 251         FontSpan const font_span = par_.fontSpan(pos);
 252         Change::Type const prev_change = par_.lookupChange(pos);
 253
 254         // first character
 255         string str;
 256         str += par_.getChar(pos);
 257         if (arabic) {
 258                 unsigned char c = str[0];
 259                 str[0] = par_.transformChar(c, pos);
 260         }
 261
 262         // collect as much similar chars as we can
 263         for (++vpos ; vpos < end ; ++vpos) {
 264                 pos = text_.bidi.vis2log(vpos);
 265                 if (pos < font_span.first || pos > font_span.last)
 266                         break;
 267
 268                 if (prev_change != par_.lookupChange(pos))
 269                         break;
 270
 271                 char c = par_.getChar(pos);
 272
 273                 if (!IsPrintableNonspace(c))
 274                         break;
 275
 276                 if (arabic && Encodings::IsComposeChar_arabic(c))
 277                         break;
 278
 279                 if (hebrew && Encodings::IsComposeChar_hebrew(c))
 280                         break;
 281
 282                 if (arabic)
 283                         c = par_.transformChar(c, pos);
 284
 285                 str += c;
 286         }
 287
 288         if (prev_change == Change::DELETED)
 289                 font.setColor(LColor::strikeout);
 290         else if (prev_change == Change::INSERTED)
 291                 font.setColor(LColor::newtext);
 292
 293         // Draw text and set the new x position
 294         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 295         pain_.text(int(x_), yo_, str, font);
 296         x_ += font_metrics::width(str, font);
 297 }
 298
 299
 300 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 301 {
 302         if (!lyxrc.mark_foreign_language)
 303                 return;
 304         if (font.language() == latex_language)
 305                 return;
 306         if (font.language() == bv_.buffer()->params().language)
 307                 return;
 308
 309         int const y = yo_ + 1 + desc;
 310         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 311 }
 312
 313
 314 void RowPainter::paintFromPos(pos_type & vpos)
 315 {
 316         pos_type const pos = text_.bidi.vis2log(vpos);
 317         LyXFont orig_font = text_.getFont(par_, pos);
 318
 319         double const orig_x = x_;
 320
 321         if (par_.isInset(pos)) {
 322                 paintInset(pos, orig_font);
 323                 ++vpos;
 324                 paintForeignMark(orig_x, orig_font,
 325                         par_.getInset(pos)->descent());
 326                 return;
 327         }
 328
 329         // usual characters, no insets
 330         char const c = par_.getChar(pos);
 331
 332         // special case languages
 333         std::string const & lang = orig_font.language()->lang();
 334         bool const hebrew = lang == "hebrew";
 335         bool const arabic = lang == "arabic" &&
 336                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 337                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 338
 339         // draw as many chars as we can
 340         if ((!hebrew && !arabic)
 341                 || (hebrew && !Encodings::IsComposeChar_hebrew(c))
 342                 || (arabic && !Encodings::IsComposeChar_arabic(c))) {
 343                 paintChars(vpos, orig_font, hebrew, arabic);
 344         } else if (hebrew) {
 345                 paintHebrewComposeChar(vpos, orig_font);
 346         } else if (arabic) {
 347                 paintArabicComposeChar(vpos, orig_font);
 348         }
 349
 350         paintForeignMark(orig_x, orig_font);
 351 }
 352
 353
 354 void RowPainter::paintChangeBar()
 355 {
 356         pos_type const start = row_.pos();
 357         pos_type const end = row_.endpos();
 358
 359         if (start == end || !par_.isChanged(start, end))
 360                 return;
 361
 362         int const height = text_.isLastRow(pit_, row_)
 363                 ? row_.ascent()
 364                 : row_.height();
 365
 366         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 367 }
 368
 369
 370 void RowPainter::paintAppendix()
 371 {
 372         if (!par_.params().appendix())
 373                 return;
 374
 375         int y = yo_ - row_.ascent();
 376
 377         if (par_.params().startOfAppendix())
 378                 y += 2 * defaultRowHeight();
 379
 380         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 381         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 382 }
 383
 384
 385 void RowPainter::paintDepthBar()
 386 {
 387         Paragraph::depth_type const depth = par_.getDepth();
 388
 389         if (depth <= 0)
 390                 return;
 391
 392         Paragraph::depth_type prev_depth = 0;
 393         if (!text_.isFirstRow(pit_, row_)) {
 394                 pit_type pit2 = pit_;
 395                 if (row_.pos() == 0)
 396                         --pit2;
 397                 prev_depth = pars_[pit2].getDepth();
 398         }
 399
 400         Paragraph::depth_type next_depth = 0;
 401         if (!text_.isLastRow(pit_, row_)) {
 402                 pit_type pit2 = pit_;
 403                 if (row_.endpos() >= pars_[pit2].size())
 404                         ++pit2;
 405                 next_depth = pars_[pit2].getDepth();
 406         }
 407
 408         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 409                 int const w = nestMargin() / 5;
 410                 int x = int(xo_) + w * i;
 411                 // only consider the changebar space if we're drawing outermost text
 412                 if (text_.isMainText())
 413                         x += changebarMargin();
 414
 415                 int const starty = yo_ - row_.ascent();
 416                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 417
 418                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 419
 420                 if (i > prev_depth)
 421                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 422                 if (i > next_depth)
 423                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 424         }
 425 }
 426
 427
 428 int RowPainter::paintAppendixStart(int y)
 429 {
 430         LyXFont pb_font;
 431         pb_font.setColor(LColor::appendix);
 432         pb_font.decSize();
 433
 434         string const label = _("Appendix");
 435         int w = 0;
 436         int a = 0;
 437         int d = 0;
 438         font_metrics::rectText(label, pb_font, w, a, d);
 439
 440         int const text_start = int(xo_ + (width_ - w) / 2);
 441         int const text_end = text_start + w;
 442
 443         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 444
 445         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 446         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 447
 448         return 3 * defaultRowHeight();
 449 }
 450
 451
 452 void RowPainter::paintFirst()
 453 {
 454         ParagraphParameters const & parparams = par_.params();
 455
 456         int y_top = 0;
 457
 458         // start of appendix?
 459         if (parparams.startOfAppendix())
 460                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 461
 462         Buffer const & buffer = *bv_.buffer();
 463
 464         LyXLayout_ptr const & layout = par_.layout();
 465
 466         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 467                 if (pit_ != 0) {
 468                         if (layout->latextype == LATEX_PARAGRAPH
 469                                 && !par_.getDepth()) {
 470                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 471                         } else {
 472                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 473                                 if (playout->latextype == LATEX_PARAGRAPH
 474                                         && !pars_[pit_ - 1].getDepth()) {
 475                                         // is it right to use defskip here, too? (AS)
 476                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 477                                 }
 478                         }
 479                 }
 480         }
 481
 482         bool const is_rtl = text_.isRTL(par_);
 483         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 484         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 485
 486         // should we print a label?
 487         if (layout->labeltype >= LABEL_STATIC
 488             && (layout->labeltype != LABEL_STATIC
 489                       || layout->latextype != LATEX_ENVIRONMENT
 490                       || is_seq)) {
 491
 492                 LyXFont const font = getLabelFont();
 493                 string const str = par_.getLabelstring();
 494                 if (!str.empty()) {
 495                         double x = x_;
 496
 497                         // this is special code for the chapter layout. This is
 498                         // printed in an extra row and has a pagebreak at
 499                         // the top.
 500                         if (layout->counter == "chapter") {
 501                                 double spacing_val = 1.0;
 502                                 if (!parparams.spacing().isDefault()) {
 503                                         spacing_val = parparams.spacing().getValue();
 504                                 } else {
 505                                         spacing_val = buffer.params().spacing().getValue();
 506                                 }
 507
 508                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 509
 510                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 511                                         + int(layout->parsep) * defaultRowHeight();
 512
 513                                 if (is_rtl) {
 514                                         x = width_ - leftMargin() -
 515                                                 font_metrics::width(str, font);
 516                                 }
 517
 518                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 519                         } else {
 520                                 if (is_rtl) {
 521                                         x = width_ - leftMargin()
 522                                                 + font_metrics::width(layout->labelsep, font);
 523                                 } else {
 524                                         x = x_ - font_metrics::width(layout->labelsep, font)
 525                                                 - font_metrics::width(str, font);
 526                                 }
 527
 528                                 pain_.text(int(x), yo_, str, font);
 529                         }
 530                 }
 531
 532         // the labels at the top of an environment.
 533         // More or less for bibliography
 534         } else if (is_seq &&
 535                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 536                 layout->labeltype == LABEL_BIBLIO ||
 537                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 538                 LyXFont font = getLabelFont();
 539                 if (!par_.getLabelstring().empty()) {
 540                         string const str = par_.getLabelstring();
 541                         double spacing_val = 1.0;
 542                         if (!parparams.spacing().isDefault())
 543                                 spacing_val = parparams.spacing().getValue();
 544                         else
 545                                 spacing_val = buffer.params().spacing().getValue();
 546
 547                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 548
 549                         int maxdesc =
 550                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 551                                 + (layout->labelbottomsep * defaultRowHeight()));
 552
 553                         double x = x_;
 554                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 555                                 if (is_rtl)
 556                                         x = leftMargin();
 557                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 558                                 x -= font_metrics::width(str, font) / 2;
 559                         } else if (is_rtl) {
 560                                 x = width_ - leftMargin() -
 561                                         font_metrics::width(str, font);
 562                         }
 563                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 564                 }
 565         }
 566 }
 567
 568
 569 void RowPainter::paintLast()
 570 {
 571         bool const is_rtl = text_.isRTL(par_);
 572         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 573
 574         // draw an endlabel
 575         switch (endlabel) {
 576         case END_LABEL_BOX:
 577         case END_LABEL_FILLED_BOX: {
 578                 LyXFont const font = getLabelFont();
 579                 int const size = int(0.75 * font_metrics::maxAscent(font));
 580                 int const y = yo_ - size;
 581                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 582
 583                 if (width_ - int(row_.width()) <= size)
 584                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 585
 586                 if (endlabel == END_LABEL_BOX)
 587                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 588                 else
 589                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 590                 break;
 591         }
 592
 593         case END_LABEL_STATIC: {
 594                 LyXFont font = getLabelFont();
 595                 string const & str = par_.layout()->endlabelstring();
 596                 double const x = is_rtl ?
 597                         x_ - font_metrics::width(str, font)
 598                         : - text_.rightMargin(par_) - row_.width();
 599                 pain_.text(int(x), yo_, str, font);
 600                 break;
 601         }
 602
 603         case END_LABEL_NO_LABEL:
 604                 break;
 605         }
 606 }
 607
 608
 609 void RowPainter::paintText()
 610 {
 611         pos_type const end = row_.endpos();
 612         pos_type body_pos = par_.beginOfBody();
 613         if (body_pos > 0 &&
 614                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 615                 body_pos = 0;
 616         }
 617
 618         LyXLayout_ptr const & layout = par_.layout();
 619
 620         bool running_strikeout = false;
 621         bool is_struckout = false;
 622         int last_strikeout_x = 0;
 623
 624         // Use font span to speed things up, see below
 625         FontSpan font_span;
 626         LyXFont font;
 627
 628         for (pos_type vpos = row_.pos(); vpos < end; ) {
 629                 if (x_ > bv_.workWidth())
 630                         break;
 631
 632                 pos_type const pos = text_.bidi.vis2log(vpos);
 633
 634                 if (pos >= par_.size()) {
 635                         ++vpos;
 636                         continue;
 637                 }
 638
 639                 // Use font span to speed things up, see above
 640                 if (vpos < font_span.first || vpos > font_span.last) {
 641                         font_span = par_.fontSpan(vpos);
 642                         font = text_.getFont(par_, vpos);
 643                 }
 644
 645                 const int width_pos =
 646                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 647
 648                 if (x_ + width_pos < 0) {
 649                         x_ += width_pos;
 650                         ++vpos;
 651                         continue;
 652                 }
 653
 654                 is_struckout = isDeletedText(par_, pos);
 655
 656                 if (is_struckout && !running_strikeout) {
 657                         running_strikeout = true;
 658                         last_strikeout_x = int(x_);
 659                 }
 660
 661                 bool const highly_editable_inset = par_.isInset(pos)
 662                         && isHighlyEditableInset(par_.getInset(pos));
 663
 664                 // If we reach the end of a struck out range, paint it.
 665                 // We also don't paint across things like tables
 666                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 667                         // Calculate 1/3 height of the buffer's default font
 668                         int const middle =
 669                                 yo_ -
 670                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 671                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 672                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 673                         running_strikeout = false;
 674                 }
 675
 676                 if (body_pos > 0 && pos == body_pos - 1) {
 677                         int const lwidth = font_metrics::width(layout->labelsep,
 678                                 getLabelFont());
 679
 680                         x_ += label_hfill_ + lwidth - width_pos;
 681                 }
 682
 683                 if (par_.isHfill(pos)) {
 684                         x_ += 1;
 685
 686                         int const y0 = yo_;
 687                         int const y1 = y0 - defaultRowHeight() / 2;
 688
 689                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 690
 691                         if (hfillExpansion(par_, row_, pos)) {
 692                                 int const y2 = (y0 + y1) / 2;
 693
 694                                 if (pos >= body_pos) {
 695                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 696                                                   LColor::added_space,
 697                                                   Painter::line_onoffdash);
 698                                         x_ += hfill_;
 699                                 } else {
 700                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 701                                                   LColor::added_space,
 702                                                   Painter::line_onoffdash);
 703                                         x_ += label_hfill_;
 704                                 }
 705                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 706                         }
 707                         x_ += 2;
 708                         ++vpos;
 709                 } else if (par_.isSeparator(pos)) {
 710                         x_ += width_pos;
 711                         if (pos >= body_pos)
 712                                 x_ += separator_;
 713                         ++vpos;
 714                 } else {
 715                         paintFromPos(vpos);
 716                 }
 717         }
 718
 719         // if we reach the end of a struck out range, paint it
 720         if (running_strikeout) {
 721                 // calculate 1/3 height of the buffer's default font
 722                 int const middle =
 723                         yo_ -
 724                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 725                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 726                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 727                 running_strikeout = false;
 728         }
 729 }
 730
 731
 732 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 733         int x, int y)
 734 {
 735         boost::crc_32_type crc;
 736         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 737                 const unsigned char b[] = { par.getChar(i) };
 738                 crc.process_bytes(b, 1);
 739         }
 740         const unsigned char b[] = { x, y, row.width() };
 741         crc.process_bytes(b, 3);
 742         return crc.checksum();
 743 }
 744
 745
 746 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 747         RowList::const_iterator rit, LyXText const & text)
 748 {
 749         // Is there a cursor on this row (or inside inset on row)
 750         LCursor & cur = pi.base.bv->cursor();
 751         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 752                 CursorSlice const & sl = cur[d];
 753                 if (sl.text() == &text
 754                     && sl.pit() == pit
 755                     && sl.pos() >= rit->pos()
 756                     && sl.pos() <= rit->endpos())
 757                         return true;
 758         }
 759         return false;
 760 }
 761
 762
 763 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 764         RowList::const_iterator rit, LyXText const & text)
 765 {
 766         // Is there a cursor inside an inset on this row, and is this inset
 767         // the only "character" on this row
 768         LCursor & cur = pi.base.bv->cursor();
 769         if (rit->pos() + 1 != rit->endpos())
 770                 return false;
 771         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 772                 CursorSlice const & sl = cur[d];
 773                 if (sl.text() == &text
 774                     && sl.pit() == pit
 775                     && sl.pos() == rit->pos())
 776                         return d < cur.depth() - 1;
 777         }
 778         return false;
 779 }
 780
 781
 782 void paintPar
 783         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 784          bool repaintAll)
 785 {
 786 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 787         static NullPainter nop;
 788         static PainterInfo nullpi(pi.base.bv, nop);
 789         int const ww = pi.base.bv->workHeight();
 790
 791         Paragraph const & par = text.paragraphs()[pit];
 792
 793         RowList::const_iterator const rb = par.rows().begin();
 794         RowList::const_iterator const re = par.rows().end();
 795         theCoords.parPos()[&text][pit] = Point(x, y);
 796
 797         y -= rb->ascent();
 798         lyx::size_type rowno(0);
 799         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 800                 y += rit->ascent();
 801                 // Allow setting of bv->repaintAll() for nested insets in
 802                 // this row only
 803                 bool tmp = pi.base.bv->repaintAll();
 804
 805                 // Row signature; has row changed since last paint?
 806                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 807                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 808
 809                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 810                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 811                         text);
 812
 813                 // If this is the only object on the row, we can make it wide
 814                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 815                         InsetBase const * const in = par.getInset(i);
 816                         if (in) {
 817                                 InsetText const * const t = in->asTextInset();
 818                                 if (t)
 819                                         t->Wide() = in_inset_alone_on_row &&
 820                                                     t->Tall();
 821                         }
 822                 }
 823
 824                 // If selection is on, the current row signature differs
 825                 // from cache, or cursor is inside an inset _on this row_,
 826                 // then paint the row
 827                 if (repaintAll || row_has_changed || cursor_on_row) {
 828                         // Add to row signature cache
 829                         par.rowSignature()[rowno] = row_sig;
 830
 831                         bool const inside = (y + rit->descent() >= 0
 832                                        && y - rit->ascent() < ww);
 833                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 834                         // Clear background of this row
 835                         // (if paragraph background was not cleared)
 836                         if (!repaintAll &&
 837                             (!in_inset_alone_on_row || row_has_changed)) {
 838                                 pi.pain.fillRectangle(( rowno ? 0 : x - 10 ), y - rit->ascent(),
 839                                     pi.base.bv->workWidth(), rit->height(),
 840                                     text.backgroundColor());
 841                                 // If outer row has changed, force nested
 842                                 // insets to repaint completely
 843                                 if (row_has_changed)
 844                                         pi.base.bv->repaintAll(true);
 845                         }
 846
 847                         // Instrumentation for testing row cache (see also
 848                         // 12 lines lower):
 849                         if (text.isMainText())
 850                                 lyxerr[Debug::PAINTING] << "#";
 851                         else
 852                                 lyxerr[Debug::PAINTING] << "[" <<
 853                                     repaintAll << row_has_changed <<
 854                                     cursor_on_row << "]";
 855                         rp.paintAppendix();
 856                         rp.paintDepthBar();
 857                         rp.paintChangeBar();
 858                         if (rit == rb)
 859                                 rp.paintFirst();
 860                         if (rit + 1 == re)
 861                                 rp.paintLast();
 862                         rp.paintText();
 863                 }
 864                 y += rit->descent();
 865                 // Restore, see above
 866                 pi.base.bv->repaintAll(tmp);
 867         }
 868         lyxerr[Debug::PAINTING] << "." << endl;
 869 }
 870
 871 } // namespace anon
 872
 873
 874 void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 875 {
 876         Painter & pain = bv.painter();
 877         LyXText * const text = bv.text();
 878         bool const select = bv.cursor().selection();
 879
 880         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 881         // Should the whole screen, including insets, be refreshed?
 882         bool repaintAll(select || !vi.singlepar);
 883
 884         if (repaintAll) {
 885                 // Clear background (if not delegated to rows)
 886                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 887                         text->backgroundColor());
 888         }
 889         if (select) {
 890                 text->drawSelection(pi, 0, 0);
 891         }
 892
 893         int yy = vi.y1;
 894         // draw contents
 895         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 896                 bv.repaintAll(repaintAll);
 897                 Paragraph const & par = text->getPar(pit);
 898                 yy += par.ascent();
 899                 paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
 900                 yy += par.descent();
 901         }
 902
 903         // Cache one paragraph above and one below
 904         // Note MV: this cannot be suppressed even for singlepar.
 905         // Try viewing the User Guide Mobius figure
 906
 907         if (vi.p1 > 0) {
 908                 text->redoParagraph(vi.p1 - 1);
 909                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 910                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 911         }
 912
 913         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 914                 text->redoParagraph(vi.p2 + 1);
 915                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 916                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 917         }
 918
 919         // and grey out above (should not happen later)
 920 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 921         if (vi.y1 > 0 && !vi.singlepar)
 922                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 923
 924         // and possibly grey out below
 925 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 926         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 927                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 928 }
 929
 930
 931 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 932 {
 933 //      lyxerr << "  paintTextInset: y: " << y << endl;
 934
 935         y -= text.getPar(0).ascent();
 936         // This flag can not be set from within same inset:
 937         bool repaintAll = pi.base.bv->repaintAll();
 938         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 939                 y += text.getPar(pit).ascent();
 940                 paintPar(pi, text, pit, x, y, repaintAll);
 941                 y += text.getPar(pit).descent();
 942         }
 943 }