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::char_type;
  46 using lyx::pos_type;
  47 using lyx::pit_type;
  48
  49 using std::endl;
  50 using std::max;
  51 using std::min;
  52 using std::string;
  53
  54
  55 namespace {
  56
  57 /**
  58  * A class used for painting an individual row of text.
  59  */
  60 class RowPainter {
  61 public:
  62         /// initialise and run painter
  63         RowPainter(PainterInfo & pi, LyXText const & text,
  64                 pit_type pit, Row const & row, int x, int y);
  65
  66         // paint various parts
  67         void paintAppendix();
  68         void paintDepthBar();
  69         void paintChangeBar();
  70         void paintFirst();
  71         void paintLast();
  72         void paintText();
  73
  74 private:
  75         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  76         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  77         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  78         void paintChars(lyx::pos_type & vpos, LyXFont font,
  79                         bool hebrew, bool arabic);
  80         int paintAppendixStart(int y);
  81         void paintFromPos(lyx::pos_type & vpos);
  82         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  83
  84         /// return left margin
  85         int leftMargin() const;
  86
  87         /// return the label font for this row
  88         LyXFont const getLabelFont() const;
  89
  90         /// bufferview to paint on
  91         BufferView const & bv_;
  92
  93         /// Painter to use
  94         Painter & pain_;
  95
  96         /// LyXText for the row
  97         LyXText const & text_;
  98         ParagraphList const & pars_;
  99
 100         /// The row to paint
 101         Row const & row_;
 102
 103         /// Row's paragraph
 104         pit_type const pit_;
 105         Paragraph const & par_;
 106
 107         /// is row erased? (change tracking)
 108         bool erased_;
 109
 110         // Looks ugly - is
 111         double const xo_;
 112         int const yo_;    // current baseline
 113         double x_;
 114         int width_;
 115         double separator_;
 116         double hfill_;
 117         double label_hfill_;
 118 };
 119
 120
 121 RowPainter::RowPainter(PainterInfo & pi,
 122         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 123         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 124           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 125           erased_(pi.erased_),
 126           xo_(x), yo_(y), width_(text_.width())
 127 {
 128         RowMetrics m = text_.computeRowMetrics(pit, row_);
 129         x_ = m.x + xo_;
 130
 131         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 132         //row_.dump();
 133
 134         separator_ = m.separator;
 135         hfill_ = m.hfill;
 136         label_hfill_ = m.label_hfill;
 137
 138         BOOST_ASSERT(pit >= 0);
 139         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 140 }
 141
 142
 143 LyXFont const RowPainter::getLabelFont() const
 144 {
 145         return text_.getLabelFont(par_);
 146 }
 147
 148
 149 int RowPainter::leftMargin() const
 150 {
 151         return text_.leftMargin(pit_, row_.pos());
 152 }
 153
 154
 155 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 156 {
 157         InsetBase const * inset = par_.getInset(pos);
 158         BOOST_ASSERT(inset);
 159         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 160         // FIXME: We should always use font, see documentation of
 161         // noFontChange() in insetbase.h.
 162         pi.base.font = inset->noFontChange() ?
 163                 bv_.buffer()->params().getFont() :
 164                 font;
 165         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 166         pi.erased_ = erased_ || isDeletedText(par_, pos);
 167         theCoords.insets().add(inset, int(x_), yo_);
 168         InsetText const * const in = inset->asTextInset();
 169         // non-wide insets are painted completely. Recursive
 170         bool tmp = bv_.repaintAll();
 171         if (!in || !in->Wide()) {
 172                 bv_.repaintAll(true);
 173                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 174         }
 175         if (bv_.repaintAll())
 176                 inset->drawSelection(pi, int(x_), yo_);
 177         inset->draw(pi, int(x_), yo_);
 178         bv_.repaintAll(tmp);
 179         x_ += inset->width();
 180 }
 181
 182
 183 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 184 {
 185         pos_type pos = text_.bidi.vis2log(vpos);
 186
 187         string str;
 188
 189         // first char
 190         char_type c = par_.getChar(pos);
 191         str += c;
 192         ++vpos;
 193
 194         int const width = font_metrics::width(c, font);
 195         int dx = 0;
 196
 197         for (pos_type i = pos - 1; i >= 0; --i) {
 198                 c = par_.getChar(i);
 199                 if (!Encodings::isComposeChar_hebrew(c)) {
 200                         if (isPrintableNonspace(c)) {
 201                                 int const width2 =
 202                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 203                                 // dalet / resh
 204                                 dx = (c == 'ø' || c == 'ã')
 205                                         ? width2 - width
 206                                         : (width2 - width) / 2;
 207                         }
 208                         break;
 209                 }
 210         }
 211
 212         // Draw nikud
 213         pain_.text(int(x_) + dx, yo_, str, font);
 214 }
 215
 216
 217 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 218 {
 219         pos_type pos = text_.bidi.vis2log(vpos);
 220         string str;
 221
 222         // first char
 223         char_type c = par_.getChar(pos);
 224         c = par_.transformChar(c, pos);
 225         str += c;
 226         ++vpos;
 227
 228         int const width = font_metrics::width(c, font);
 229         int dx = 0;
 230
 231         for (pos_type i = pos - 1; i >= 0; --i) {
 232                 c = par_.getChar(i);
 233                 if (!Encodings::isComposeChar_arabic(c)) {
 234                         if (isPrintableNonspace(c)) {
 235                                 int const width2 =
 236                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 237                                 dx = (width2 - width) / 2;
 238                         }
 239                         break;
 240                 }
 241         }
 242         // Draw nikud
 243         pain_.text(int(x_) + dx, yo_, str, font);
 244 }
 245
 246
 247 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 248                             bool hebrew, bool arabic)
 249 {
 250         pos_type pos = text_.bidi.vis2log(vpos);
 251         pos_type const end = row_.endpos();
 252         FontSpan const font_span = par_.fontSpan(pos);
 253         Change::Type const prev_change = par_.lookupChange(pos);
 254
 255         // first character
 256         string str;
 257         str += par_.getChar(pos);
 258         if (arabic) {
 259                 unsigned char c = str[0];
 260                 str[0] = par_.transformChar(c, pos);
 261         }
 262
 263         // collect as much similar chars as we can
 264         for (++vpos ; vpos < end ; ++vpos) {
 265                 pos = text_.bidi.vis2log(vpos);
 266                 if (pos < font_span.first || pos > font_span.last)
 267                         break;
 268
 269                 if (prev_change != par_.lookupChange(pos))
 270                         break;
 271
 272                 char_type c = par_.getChar(pos);
 273
 274                 if (!isPrintableNonspace(c))
 275                         break;
 276
 277                 if (arabic && Encodings::isComposeChar_arabic(c))
 278                         break;
 279
 280                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 281                         break;
 282
 283                 if (arabic)
 284                         c = par_.transformChar(c, pos);
 285
 286                 str += c;
 287         }
 288
 289         if (prev_change == Change::DELETED)
 290                 font.setColor(LColor::strikeout);
 291         else if (prev_change == Change::INSERTED)
 292                 font.setColor(LColor::newtext);
 293
 294         // Draw text and set the new x position
 295         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 296         pain_.text(int(x_), yo_, str, font);
 297         x_ += font_metrics::width(str, font);
 298 }
 299
 300
 301 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 302 {
 303         if (!lyxrc.mark_foreign_language)
 304                 return;
 305         if (font.language() == latex_language)
 306                 return;
 307         if (font.language() == bv_.buffer()->params().language)
 308                 return;
 309
 310         int const y = yo_ + 1 + desc;
 311         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 312 }
 313
 314
 315 void RowPainter::paintFromPos(pos_type & vpos)
 316 {
 317         pos_type const pos = text_.bidi.vis2log(vpos);
 318         LyXFont orig_font = text_.getFont(par_, pos);
 319
 320         double const orig_x = x_;
 321
 322         if (par_.isInset(pos)) {
 323                 paintInset(pos, orig_font);
 324                 ++vpos;
 325                 paintForeignMark(orig_x, orig_font,
 326                         par_.getInset(pos)->descent());
 327                 return;
 328         }
 329
 330         // usual characters, no insets
 331         char_type const c = par_.getChar(pos);
 332
 333         // special case languages
 334         std::string const & lang = orig_font.language()->lang();
 335         bool const hebrew = lang == "hebrew";
 336         bool const arabic = lang == "arabic" &&
 337                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 338                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 339
 340         // draw as many chars as we can
 341         if ((!hebrew && !arabic)
 342                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 343                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 344                 paintChars(vpos, orig_font, hebrew, arabic);
 345         } else if (hebrew) {
 346                 paintHebrewComposeChar(vpos, orig_font);
 347         } else if (arabic) {
 348                 paintArabicComposeChar(vpos, orig_font);
 349         }
 350
 351         paintForeignMark(orig_x, orig_font);
 352 }
 353
 354
 355 void RowPainter::paintChangeBar()
 356 {
 357         pos_type const start = row_.pos();
 358         pos_type const end = row_.endpos();
 359
 360         if (start == end || !par_.isChanged(start, end))
 361                 return;
 362
 363         int const height = text_.isLastRow(pit_, row_)
 364                 ? row_.ascent()
 365                 : row_.height();
 366
 367         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 368 }
 369
 370
 371 void RowPainter::paintAppendix()
 372 {
 373         if (!par_.params().appendix())
 374                 return;
 375
 376         int y = yo_ - row_.ascent();
 377
 378         if (par_.params().startOfAppendix())
 379                 y += 2 * defaultRowHeight();
 380
 381         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 382         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 383 }
 384
 385
 386 void RowPainter::paintDepthBar()
 387 {
 388         Paragraph::depth_type const depth = par_.getDepth();
 389
 390         if (depth <= 0)
 391                 return;
 392
 393         Paragraph::depth_type prev_depth = 0;
 394         if (!text_.isFirstRow(pit_, row_)) {
 395                 pit_type pit2 = pit_;
 396                 if (row_.pos() == 0)
 397                         --pit2;
 398                 prev_depth = pars_[pit2].getDepth();
 399         }
 400
 401         Paragraph::depth_type next_depth = 0;
 402         if (!text_.isLastRow(pit_, row_)) {
 403                 pit_type pit2 = pit_;
 404                 if (row_.endpos() >= pars_[pit2].size())
 405                         ++pit2;
 406                 next_depth = pars_[pit2].getDepth();
 407         }
 408
 409         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 410                 int const w = nestMargin() / 5;
 411                 int x = int(xo_) + w * i;
 412                 // only consider the changebar space if we're drawing outermost text
 413                 if (text_.isMainText())
 414                         x += changebarMargin();
 415
 416                 int const starty = yo_ - row_.ascent();
 417                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 418
 419                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 420
 421                 if (i > prev_depth)
 422                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 423                 if (i > next_depth)
 424                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 425         }
 426 }
 427
 428
 429 int RowPainter::paintAppendixStart(int y)
 430 {
 431         LyXFont pb_font;
 432         pb_font.setColor(LColor::appendix);
 433         pb_font.decSize();
 434
 435         string const label = _("Appendix");
 436         int w = 0;
 437         int a = 0;
 438         int d = 0;
 439         font_metrics::rectText(label, pb_font, w, a, d);
 440
 441         int const text_start = int(xo_ + (width_ - w) / 2);
 442         int const text_end = text_start + w;
 443
 444         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 445
 446         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 447         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 448
 449         return 3 * defaultRowHeight();
 450 }
 451
 452
 453 void RowPainter::paintFirst()
 454 {
 455         ParagraphParameters const & parparams = par_.params();
 456
 457         int y_top = 0;
 458
 459         // start of appendix?
 460         if (parparams.startOfAppendix())
 461                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 462
 463         Buffer const & buffer = *bv_.buffer();
 464
 465         LyXLayout_ptr const & layout = par_.layout();
 466
 467         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 468                 if (pit_ != 0) {
 469                         if (layout->latextype == LATEX_PARAGRAPH
 470                                 && !par_.getDepth()) {
 471                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 472                         } else {
 473                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 474                                 if (playout->latextype == LATEX_PARAGRAPH
 475                                         && !pars_[pit_ - 1].getDepth()) {
 476                                         // is it right to use defskip here, too? (AS)
 477                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 478                                 }
 479                         }
 480                 }
 481         }
 482
 483         bool const is_rtl = text_.isRTL(par_);
 484         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 485         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 486
 487         // should we print a label?
 488         if (layout->labeltype >= LABEL_STATIC
 489             && (layout->labeltype != LABEL_STATIC
 490                       || layout->latextype != LATEX_ENVIRONMENT
 491                       || is_seq)) {
 492
 493                 LyXFont const font = getLabelFont();
 494                 string const str = par_.getLabelstring();
 495                 if (!str.empty()) {
 496                         double x = x_;
 497
 498                         // this is special code for the chapter layout. This is
 499                         // printed in an extra row and has a pagebreak at
 500                         // the top.
 501                         if (layout->counter == "chapter") {
 502                                 double spacing_val = 1.0;
 503                                 if (!parparams.spacing().isDefault()) {
 504                                         spacing_val = parparams.spacing().getValue();
 505                                 } else {
 506                                         spacing_val = buffer.params().spacing().getValue();
 507                                 }
 508
 509                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 510
 511                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 512                                         + int(layout->parsep) * defaultRowHeight();
 513
 514                                 if (is_rtl) {
 515                                         x = width_ - leftMargin() -
 516                                                 font_metrics::width(str, font);
 517                                 }
 518
 519                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 520                         } else {
 521                                 if (is_rtl) {
 522                                         x = width_ - leftMargin()
 523                                                 + font_metrics::width(layout->labelsep, font);
 524                                 } else {
 525                                         x = x_ - font_metrics::width(layout->labelsep, font)
 526                                                 - font_metrics::width(str, font);
 527                                 }
 528
 529                                 pain_.text(int(x), yo_, str, font);
 530                         }
 531                 }
 532
 533         // the labels at the top of an environment.
 534         // More or less for bibliography
 535         } else if (is_seq &&
 536                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 537                 layout->labeltype == LABEL_BIBLIO ||
 538                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 539                 LyXFont font = getLabelFont();
 540                 if (!par_.getLabelstring().empty()) {
 541                         string const str = par_.getLabelstring();
 542                         double spacing_val = 1.0;
 543                         if (!parparams.spacing().isDefault())
 544                                 spacing_val = parparams.spacing().getValue();
 545                         else
 546                                 spacing_val = buffer.params().spacing().getValue();
 547
 548                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 549
 550                         int maxdesc =
 551                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 552                                 + (layout->labelbottomsep * defaultRowHeight()));
 553
 554                         double x = x_;
 555                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 556                                 if (is_rtl)
 557                                         x = leftMargin();
 558                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 559                                 x -= font_metrics::width(str, font) / 2;
 560                         } else if (is_rtl) {
 561                                 x = width_ - leftMargin() -
 562                                         font_metrics::width(str, font);
 563                         }
 564                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 565                 }
 566         }
 567 }
 568
 569
 570 void RowPainter::paintLast()
 571 {
 572         bool const is_rtl = text_.isRTL(par_);
 573         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 574
 575         // draw an endlabel
 576         switch (endlabel) {
 577         case END_LABEL_BOX:
 578         case END_LABEL_FILLED_BOX: {
 579                 LyXFont const font = getLabelFont();
 580                 int const size = int(0.75 * font_metrics::maxAscent(font));
 581                 int const y = yo_ - size;
 582                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 583
 584                 if (width_ - int(row_.width()) <= size)
 585                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 586
 587                 if (endlabel == END_LABEL_BOX)
 588                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 589                 else
 590                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 591                 break;
 592         }
 593
 594         case END_LABEL_STATIC: {
 595                 LyXFont font = getLabelFont();
 596                 string const & str = par_.layout()->endlabelstring();
 597                 double const x = is_rtl ?
 598                         x_ - font_metrics::width(str, font)
 599                         : - text_.rightMargin(par_) - row_.width();
 600                 pain_.text(int(x), yo_, str, font);
 601                 break;
 602         }
 603
 604         case END_LABEL_NO_LABEL:
 605                 break;
 606         }
 607 }
 608
 609
 610 void RowPainter::paintText()
 611 {
 612         pos_type const end = row_.endpos();
 613         pos_type body_pos = par_.beginOfBody();
 614         if (body_pos > 0 &&
 615                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 616                 body_pos = 0;
 617         }
 618
 619         LyXLayout_ptr const & layout = par_.layout();
 620
 621         bool running_strikeout = false;
 622         bool is_struckout = false;
 623         int last_strikeout_x = 0;
 624
 625         // Use font span to speed things up, see below
 626         FontSpan font_span;
 627         LyXFont font;
 628
 629         for (pos_type vpos = row_.pos(); vpos < end; ) {
 630                 if (x_ > bv_.workWidth())
 631                         break;
 632
 633                 pos_type const pos = text_.bidi.vis2log(vpos);
 634
 635                 if (pos >= par_.size()) {
 636                         ++vpos;
 637                         continue;
 638                 }
 639
 640                 // Use font span to speed things up, see above
 641                 if (vpos < font_span.first || vpos > font_span.last) {
 642                         font_span = par_.fontSpan(vpos);
 643                         font = text_.getFont(par_, vpos);
 644                 }
 645
 646                 const int width_pos =
 647                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 648
 649                 if (x_ + width_pos < 0) {
 650                         x_ += width_pos;
 651                         ++vpos;
 652                         continue;
 653                 }
 654
 655                 is_struckout = isDeletedText(par_, pos);
 656
 657                 if (is_struckout && !running_strikeout) {
 658                         running_strikeout = true;
 659                         last_strikeout_x = int(x_);
 660                 }
 661
 662                 bool const highly_editable_inset = par_.isInset(pos)
 663                         && isHighlyEditableInset(par_.getInset(pos));
 664
 665                 // If we reach the end of a struck out range, paint it.
 666                 // We also don't paint across things like tables
 667                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 668                         // Calculate 1/3 height of the buffer's default font
 669                         int const middle =
 670                                 yo_ -
 671                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 672                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 673                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 674                         running_strikeout = false;
 675                 }
 676
 677                 if (body_pos > 0 && pos == body_pos - 1) {
 678                         int const lwidth = font_metrics::width(layout->labelsep,
 679                                 getLabelFont());
 680
 681                         x_ += label_hfill_ + lwidth - width_pos;
 682                 }
 683
 684                 if (par_.isHfill(pos)) {
 685                         x_ += 1;
 686
 687                         int const y0 = yo_;
 688                         int const y1 = y0 - defaultRowHeight() / 2;
 689
 690                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 691
 692                         if (hfillExpansion(par_, row_, pos)) {
 693                                 int const y2 = (y0 + y1) / 2;
 694
 695                                 if (pos >= body_pos) {
 696                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 697                                                   LColor::added_space,
 698                                                   Painter::line_onoffdash);
 699                                         x_ += hfill_;
 700                                 } else {
 701                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 702                                                   LColor::added_space,
 703                                                   Painter::line_onoffdash);
 704                                         x_ += label_hfill_;
 705                                 }
 706                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 707                         }
 708                         x_ += 2;
 709                         ++vpos;
 710                 } else if (par_.isSeparator(pos)) {
 711                         x_ += width_pos;
 712                         if (pos >= body_pos)
 713                                 x_ += separator_;
 714                         ++vpos;
 715                 } else {
 716                         paintFromPos(vpos);
 717                 }
 718         }
 719
 720         // if we reach the end of a struck out range, paint it
 721         if (running_strikeout) {
 722                 // calculate 1/3 height of the buffer's default font
 723                 int const middle =
 724                         yo_ -
 725                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 726                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 727                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 728                 running_strikeout = false;
 729         }
 730 }
 731
 732
 733 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 734         int x, int y)
 735 {
 736         boost::crc_32_type crc;
 737         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 738                 const unsigned char b[] = { par.getChar(i) };
 739                 crc.process_bytes(b, 1);
 740         }
 741         const unsigned char b[] = { x, y, row.width() };
 742         crc.process_bytes(b, 3);
 743         return crc.checksum();
 744 }
 745
 746
 747 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 748         RowList::const_iterator rit, LyXText const & text)
 749 {
 750         // Is there a cursor on this row (or inside inset on row)
 751         LCursor & cur = pi.base.bv->cursor();
 752         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 753                 CursorSlice const & sl = cur[d];
 754                 if (sl.text() == &text
 755                     && sl.pit() == pit
 756                     && sl.pos() >= rit->pos()
 757                     && sl.pos() <= rit->endpos())
 758                         return true;
 759         }
 760         return false;
 761 }
 762
 763
 764 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 765         RowList::const_iterator rit, LyXText const & text)
 766 {
 767         // Is there a cursor inside an inset on this row, and is this inset
 768         // the only "character" on this row
 769         LCursor & cur = pi.base.bv->cursor();
 770         if (rit->pos() + 1 != rit->endpos())
 771                 return false;
 772         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 773                 CursorSlice const & sl = cur[d];
 774                 if (sl.text() == &text
 775                     && sl.pit() == pit
 776                     && sl.pos() == rit->pos())
 777                         return d < cur.depth() - 1;
 778         }
 779         return false;
 780 }
 781
 782
 783 void paintPar
 784         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 785          bool repaintAll)
 786 {
 787 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 788         static NullPainter nop;
 789         static PainterInfo nullpi(pi.base.bv, nop);
 790         int const ww = pi.base.bv->workHeight();
 791
 792         Paragraph const & par = text.paragraphs()[pit];
 793
 794         RowList::const_iterator const rb = par.rows().begin();
 795         RowList::const_iterator const re = par.rows().end();
 796         theCoords.parPos()[&text][pit] = Point(x, y);
 797
 798         y -= rb->ascent();
 799         lyx::size_type rowno(0);
 800         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 801                 y += rit->ascent();
 802                 // Allow setting of bv->repaintAll() for nested insets in
 803                 // this row only
 804                 bool tmp = pi.base.bv->repaintAll();
 805
 806                 // Row signature; has row changed since last paint?
 807                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 808                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 809
 810                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 811                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 812                         text);
 813
 814                 // If this is the only object on the row, we can make it wide
 815                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 816                         InsetBase const * const in = par.getInset(i);
 817                         if (in) {
 818                                 InsetText const * const t = in->asTextInset();
 819                                 if (t)
 820                                         t->Wide() = in_inset_alone_on_row &&
 821                                                     t->Tall();
 822                         }
 823                 }
 824
 825                 // If selection is on, the current row signature differs
 826                 // from cache, or cursor is inside an inset _on this row_,
 827                 // then paint the row
 828                 if (repaintAll || row_has_changed || cursor_on_row) {
 829                         // Add to row signature cache
 830                         par.rowSignature()[rowno] = row_sig;
 831
 832                         bool const inside = (y + rit->descent() >= 0
 833                                        && y - rit->ascent() < ww);
 834                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 835                         // Clear background of this row
 836                         // (if paragraph background was not cleared)
 837                         if (!repaintAll &&
 838                             (!in_inset_alone_on_row || row_has_changed)) {
 839                                 pi.pain.fillRectangle(( rowno ? 0 : x - 10 ), y - rit->ascent(),
 840                                     pi.base.bv->workWidth(), rit->height(),
 841                                     text.backgroundColor());
 842                                 // If outer row has changed, force nested
 843                                 // insets to repaint completely
 844                                 if (row_has_changed)
 845                                         pi.base.bv->repaintAll(true);
 846                         }
 847
 848                         // Instrumentation for testing row cache (see also
 849                         // 12 lines lower):
 850                         if (text.isMainText())
 851                                 lyxerr[Debug::PAINTING] << "#";
 852                         else
 853                                 lyxerr[Debug::PAINTING] << "[" <<
 854                                     repaintAll << row_has_changed <<
 855                                     cursor_on_row << "]";
 856                         rp.paintAppendix();
 857                         rp.paintDepthBar();
 858                         rp.paintChangeBar();
 859                         if (rit == rb)
 860                                 rp.paintFirst();
 861                         if (rit + 1 == re)
 862                                 rp.paintLast();
 863                         rp.paintText();
 864                 }
 865                 y += rit->descent();
 866                 // Restore, see above
 867                 pi.base.bv->repaintAll(tmp);
 868         }
 869         lyxerr[Debug::PAINTING] << "." << endl;
 870 }
 871
 872 } // namespace anon
 873
 874
 875 void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 876 {
 877         Painter & pain = bv.painter();
 878         LyXText * const text = bv.text();
 879         bool const select = bv.cursor().selection();
 880
 881         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 882         // Should the whole screen, including insets, be refreshed?
 883         bool repaintAll(select || !vi.singlepar);
 884
 885         if (repaintAll) {
 886                 // Clear background (if not delegated to rows)
 887                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 888                         text->backgroundColor());
 889         }
 890         if (select) {
 891                 text->drawSelection(pi, 0, 0);
 892         }
 893
 894         int yy = vi.y1;
 895         // draw contents
 896         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 897                 bv.repaintAll(repaintAll);
 898                 Paragraph const & par = text->getPar(pit);
 899                 yy += par.ascent();
 900                 paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
 901                 yy += par.descent();
 902         }
 903
 904         // Cache one paragraph above and one below
 905         // Note MV: this cannot be suppressed even for singlepar.
 906         // Try viewing the User Guide Mobius figure
 907
 908         if (vi.p1 > 0) {
 909                 text->redoParagraph(vi.p1 - 1);
 910                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 911                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 912         }
 913
 914         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 915                 text->redoParagraph(vi.p2 + 1);
 916                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 917                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 918         }
 919
 920         // and grey out above (should not happen later)
 921 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 922         if (vi.y1 > 0 && !vi.singlepar)
 923                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 924
 925         // and possibly grey out below
 926 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 927         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 928                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 929 }
 930
 931
 932 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 933 {
 934 //      lyxerr << "  paintTextInset: y: " << y << endl;
 935
 936         y -= text.getPar(0).ascent();
 937         // This flag can not be set from within same inset:
 938         bool repaintAll = pi.base.bv->repaintAll();
 939         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 940                 y += text.getPar(pit).ascent();
 941                 paintPar(pi, text, pit, x, y, repaintAll);
 942                 y += text.getPar(pit).descent();
 943         }
 944 }