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/Application.h"
  36 #include "frontends/FontLoader.h"
  37 #include "frontends/FontMetrics.h"
  38 #include "frontends/nullpainter.h"
  39 #include "frontends/Painter.h"
  40
  41 #include "insets/insettext.h"
  42
  43 #include "support/textutils.h"
  44
  45 #include <boost/crc.hpp>
  46
  47 using lyx::docstring;
  48 using lyx::frontend::Painter;
  49 using lyx::frontend::NullPainter;
  50 using lyx::frontend::FontMetrics;
  51
  52 using lyx::char_type;
  53 using lyx::pos_type;
  54 using lyx::pit_type;
  55
  56 using std::endl;
  57 using std::max;
  58 using std::min;
  59 using std::string;
  60
  61
  62 namespace {
  63
  64 /// Flag: do a full redraw of inside text of inset
  65 /// Working variable indicating a full screen refresh
  66 bool refreshInside;
  67
  68 /**
  69  * A class used for painting an individual row of text.
  70  */
  71 class RowPainter {
  72 public:
  73         /// initialise and run painter
  74         RowPainter(PainterInfo & pi, LyXText const & text,
  75                 pit_type pit, Row const & row, int x, int y);
  76
  77         // paint various parts
  78         void paintAppendix();
  79         void paintDepthBar();
  80         void paintChangeBar();
  81         void paintFirst();
  82         void paintLast();
  83         void paintText();
  84
  85 private:
  86         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  87         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  88         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  89         void paintChars(lyx::pos_type & vpos, LyXFont font,
  90                         bool hebrew, bool arabic);
  91         int paintAppendixStart(int y);
  92         void paintFromPos(lyx::pos_type & vpos);
  93         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  94
  95         /// return left margin
  96         int leftMargin() const;
  97
  98         /// return the label font for this row
  99         LyXFont const getLabelFont() const;
 100
 101         /// bufferview to paint on
 102         BufferView const & bv_;
 103
 104         /// Painter to use
 105         Painter & pain_;
 106
 107         /// LyXText for the row
 108         LyXText const & text_;
 109         ParagraphList const & pars_;
 110
 111         /// The row to paint
 112         Row const & row_;
 113
 114         /// Row's paragraph
 115         pit_type const pit_;
 116         Paragraph const & par_;
 117
 118         /// is row erased? (change tracking)
 119         bool erased_;
 120
 121         // Looks ugly - is
 122         double const xo_;
 123         int const yo_;    // current baseline
 124         double x_;
 125         int width_;
 126         double separator_;
 127         double hfill_;
 128         double label_hfill_;
 129 };
 130
 131
 132 RowPainter::RowPainter(PainterInfo & pi,
 133         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 134         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 135           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 136           erased_(pi.erased_),
 137           xo_(x), yo_(y), width_(text_.width())
 138 {
 139         RowMetrics m = text_.computeRowMetrics(pit, row_);
 140         x_ = m.x + xo_;
 141
 142         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 143         //row_.dump();
 144
 145         separator_ = m.separator;
 146         hfill_ = m.hfill;
 147         label_hfill_ = m.label_hfill;
 148
 149         BOOST_ASSERT(pit >= 0);
 150         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 151 }
 152
 153
 154 LyXFont const RowPainter::getLabelFont() const
 155 {
 156         return text_.getLabelFont(par_);
 157 }
 158
 159
 160 int RowPainter::leftMargin() const
 161 {
 162         return text_.leftMargin(pit_, row_.pos());
 163 }
 164
 165
 166 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 167 {
 168         InsetBase const * inset = par_.getInset(pos);
 169         BOOST_ASSERT(inset);
 170         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 171         // FIXME: We should always use font, see documentation of
 172         // noFontChange() in insetbase.h.
 173         pi.base.font = inset->noFontChange() ?
 174                 bv_.buffer()->params().getFont() :
 175                 font;
 176         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 177         pi.erased_ = erased_ || isDeletedText(par_, pos);
 178         theCoords.insets().add(inset, int(x_), yo_);
 179         InsetText const * const in = inset->asTextInset();
 180         // non-wide insets are painted completely. Recursive
 181         bool tmp = refreshInside;
 182         if (!in || !in->Wide()) {
 183                 refreshInside = true;
 184                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 185         }
 186         if (refreshInside)
 187                 inset->drawSelection(pi, int(x_), yo_);
 188         inset->draw(pi, int(x_), yo_);
 189         refreshInside = tmp;
 190         x_ += inset->width();
 191 }
 192
 193
 194 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 195 {
 196         pos_type pos = text_.bidi.vis2log(vpos);
 197
 198         string str;
 199
 200         // first char
 201         char_type c = par_.getChar(pos);
 202         str += c;
 203         ++vpos;
 204
 205         int const width = theApp->fontLoader().metrics(font).width(c);
 206         int dx = 0;
 207
 208         for (pos_type i = pos - 1; i >= 0; --i) {
 209                 c = par_.getChar(i);
 210                 if (!Encodings::isComposeChar_hebrew(c)) {
 211                         if (isPrintableNonspace(c)) {
 212                                 int const width2 =
 213                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 214                                 // dalet / resh
 215                                 dx = (c == 'ø' || c == 'ã')
 216                                         ? width2 - width
 217                                         : (width2 - width) / 2;
 218                         }
 219                         break;
 220                 }
 221         }
 222
 223         // Draw nikud
 224         docstring dstr(str.begin(), str.end());
 225         pain_.text(int(x_) + dx, yo_, dstr, font);
 226 }
 227
 228
 229 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 230 {
 231         pos_type pos = text_.bidi.vis2log(vpos);
 232         string str;
 233
 234         // first char
 235         char_type c = par_.getChar(pos);
 236         c = par_.transformChar(c, pos);
 237         str += c;
 238         ++vpos;
 239
 240         int const width = theApp->fontLoader().metrics(font).width(c);
 241         int dx = 0;
 242
 243         for (pos_type i = pos - 1; i >= 0; --i) {
 244                 c = par_.getChar(i);
 245                 if (!Encodings::isComposeChar_arabic(c)) {
 246                         if (isPrintableNonspace(c)) {
 247                                 int const width2 =
 248                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 249                                 dx = (width2 - width) / 2;
 250                         }
 251                         break;
 252                 }
 253         }
 254         // Draw nikud
 255         docstring dstr(str.begin(), str.end());
 256         pain_.text(int(x_) + dx, yo_, dstr, font);
 257 }
 258
 259
 260 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 261                             bool hebrew, bool arabic)
 262 {
 263         pos_type pos = text_.bidi.vis2log(vpos);
 264         pos_type const end = row_.endpos();
 265         FontSpan const font_span = par_.fontSpan(pos);
 266         Change::Type const prev_change = par_.lookupChange(pos).type;
 267
 268         // first character
 269 #if 0
 270         string str;
 271         str += par_.getChar(pos);
 272 #else
 273         std::vector<char_type> str;
 274         str.push_back(par_.getChar(pos));
 275 #endif
 276         if (arabic) {
 277                 char_type c = str[0];
 278                 str[0] = par_.transformChar(c, pos);
 279         }
 280
 281         // collect as much similar chars as we can
 282         for (++vpos ; vpos < end ; ++vpos) {
 283                 pos = text_.bidi.vis2log(vpos);
 284                 if (pos < font_span.first || pos > font_span.last)
 285                         break;
 286
 287                 if (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         pain_.text(int(x_), yo_, str, font);
 320         x_ += theApp->fontLoader().metrics(font).width(str);
 321 #else
 322         pain_.text(int(x_), yo_, &str[0], str.size(), font);
 323         x_ += theApp->fontLoader().metrics(font).width(&str[0], str.size());
 324 #endif
 325 }
 326
 327
 328 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 329 {
 330         if (!lyxrc.mark_foreign_language)
 331                 return;
 332         if (font.language() == latex_language)
 333                 return;
 334         if (font.language() == bv_.buffer()->params().language)
 335                 return;
 336
 337         int const y = yo_ + 1 + desc;
 338         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 339 }
 340
 341
 342 void RowPainter::paintFromPos(pos_type & vpos)
 343 {
 344         pos_type const pos = text_.bidi.vis2log(vpos);
 345         LyXFont orig_font = text_.getFont(par_, pos);
 346
 347         double const orig_x = x_;
 348
 349         if (par_.isInset(pos)) {
 350                 paintInset(pos, orig_font);
 351                 ++vpos;
 352                 paintForeignMark(orig_x, orig_font,
 353                         par_.getInset(pos)->descent());
 354                 return;
 355         }
 356
 357         // usual characters, no insets
 358         char_type const c = par_.getChar(pos);
 359
 360         // special case languages
 361         std::string const & lang = orig_font.language()->lang();
 362         bool const hebrew = lang == "hebrew";
 363         bool const arabic = lang == "arabic" &&
 364                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 365                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 366
 367         // draw as many chars as we can
 368         if ((!hebrew && !arabic)
 369                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 370                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 371                 paintChars(vpos, orig_font, hebrew, arabic);
 372         } else if (hebrew) {
 373                 paintHebrewComposeChar(vpos, orig_font);
 374         } else if (arabic) {
 375                 paintArabicComposeChar(vpos, orig_font);
 376         }
 377
 378         paintForeignMark(orig_x, orig_font);
 379 }
 380
 381
 382 void RowPainter::paintChangeBar()
 383 {
 384         pos_type const start = row_.pos();
 385         pos_type const end = row_.endpos();
 386
 387         if (start == end || !par_.isChanged(start, end))
 388                 return;
 389
 390         int const height = text_.isLastRow(pit_, row_)
 391                 ? row_.ascent()
 392                 : row_.height();
 393
 394         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 395 }
 396
 397
 398 void RowPainter::paintAppendix()
 399 {
 400         if (!par_.params().appendix())
 401                 return;
 402
 403         int y = yo_ - row_.ascent();
 404
 405         if (par_.params().startOfAppendix())
 406                 y += 2 * defaultRowHeight();
 407
 408         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 409         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 410 }
 411
 412
 413 void RowPainter::paintDepthBar()
 414 {
 415         Paragraph::depth_type const depth = par_.getDepth();
 416
 417         if (depth <= 0)
 418                 return;
 419
 420         Paragraph::depth_type prev_depth = 0;
 421         if (!text_.isFirstRow(pit_, row_)) {
 422                 pit_type pit2 = pit_;
 423                 if (row_.pos() == 0)
 424                         --pit2;
 425                 prev_depth = pars_[pit2].getDepth();
 426         }
 427
 428         Paragraph::depth_type next_depth = 0;
 429         if (!text_.isLastRow(pit_, row_)) {
 430                 pit_type pit2 = pit_;
 431                 if (row_.endpos() >= pars_[pit2].size())
 432                         ++pit2;
 433                 next_depth = pars_[pit2].getDepth();
 434         }
 435
 436         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 437                 int const w = nestMargin() / 5;
 438                 int x = int(xo_) + w * i;
 439                 // only consider the changebar space if we're drawing outermost text
 440                 if (text_.isMainText())
 441                         x += changebarMargin();
 442
 443                 int const starty = yo_ - row_.ascent();
 444                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 445
 446                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 447
 448                 if (i > prev_depth)
 449                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 450                 if (i > next_depth)
 451                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 452         }
 453 }
 454
 455
 456 int RowPainter::paintAppendixStart(int y)
 457 {
 458         LyXFont pb_font;
 459         pb_font.setColor(LColor::appendix);
 460         pb_font.decSize();
 461
 462         string const label = lyx::to_utf8(_("Appendix"));
 463         int w = 0;
 464         int a = 0;
 465         int d = 0;
 466         docstring dlab(label.begin(), label.end());
 467         theApp->fontLoader().metrics(pb_font).rectText(dlab, w, a, d);
 468
 469         int const text_start = int(xo_ + (width_ - w) / 2);
 470         int const text_end = text_start + w;
 471
 472         pain_.rectText(text_start, y + d, dlab, pb_font, LColor::none, LColor::none);
 473
 474         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 475         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 476
 477         return 3 * defaultRowHeight();
 478 }
 479
 480
 481 void RowPainter::paintFirst()
 482 {
 483         ParagraphParameters const & parparams = par_.params();
 484
 485         int y_top = 0;
 486
 487         // start of appendix?
 488         if (parparams.startOfAppendix())
 489                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 490
 491         Buffer const & buffer = *bv_.buffer();
 492
 493         LyXLayout_ptr const & layout = par_.layout();
 494
 495         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 496                 if (pit_ != 0) {
 497                         if (layout->latextype == LATEX_PARAGRAPH
 498                                 && !par_.getDepth()) {
 499                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 500                         } else {
 501                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 502                                 if (playout->latextype == LATEX_PARAGRAPH
 503                                         && !pars_[pit_ - 1].getDepth()) {
 504                                         // is it right to use defskip here, too? (AS)
 505                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 506                                 }
 507                         }
 508                 }
 509         }
 510
 511         bool const is_rtl = text_.isRTL(par_);
 512         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 513         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 514
 515         // should we print a label?
 516         if (layout->labeltype >= LABEL_STATIC
 517             && (layout->labeltype != LABEL_STATIC
 518                       || layout->latextype != LATEX_ENVIRONMENT
 519                       || is_seq)) {
 520
 521                 LyXFont const font = getLabelFont();
 522                 FontMetrics const & fm =
 523                         theApp->fontLoader().metrics(font);
 524
 525                 string const str = par_.getLabelstring();
 526                 if (!str.empty()) {
 527                         double x = x_;
 528                         docstring dstr(str.begin(), str.end());
 529
 530                         // this is special code for the chapter layout. This is
 531                         // printed in an extra row and has a pagebreak at
 532                         // the top.
 533                         if (layout->counter == "chapter") {
 534                                 double spacing_val = 1.0;
 535                                 if (!parparams.spacing().isDefault()) {
 536                                         spacing_val = parparams.spacing().getValue();
 537                                 } else {
 538                                         spacing_val = buffer.params().spacing().getValue();
 539                                 }
 540
 541                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 542
 543                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 544                                         + int(layout->parsep) * defaultRowHeight();
 545
 546                                 if (is_rtl) {
 547                                         x = width_ - leftMargin() -
 548                                                 fm.width(dstr);
 549                                 }
 550
 551                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 552                         } else {
 553                                 string lab = layout->labelsep;
 554                                 docstring dlab(lab.begin(), lab.end());
 555                                 if (is_rtl) {
 556                                         x = width_ - leftMargin()
 557                                                 + fm.width(dlab);
 558                                 } else {
 559                                         x = x_ - fm.width(dlab)
 560                                                 - fm.width(dstr);
 561                                 }
 562
 563                                 pain_.text(int(x), yo_, dstr, font);
 564                         }
 565                 }
 566
 567         // the labels at the top of an environment.
 568         // More or less for bibliography
 569         } else if (is_seq &&
 570                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 571                 layout->labeltype == LABEL_BIBLIO ||
 572                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 573                 LyXFont font = getLabelFont();
 574                 if (!par_.getLabelstring().empty()) {
 575                         string const str = par_.getLabelstring();
 576                         docstring dstr(str.begin(), str.end());
 577                         double spacing_val = 1.0;
 578                         if (!parparams.spacing().isDefault())
 579                                 spacing_val = parparams.spacing().getValue();
 580                         else
 581                                 spacing_val = buffer.params().spacing().getValue();
 582
 583                         FontMetrics const & fm =
 584                                 theApp->fontLoader().metrics(font);
 585
 586                         int const labeladdon = int(fm.maxHeight()
 587                                 * layout->spacing.getValue() * spacing_val);
 588
 589                         int maxdesc =
 590                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 591                                 + (layout->labelbottomsep * defaultRowHeight()));
 592
 593                         double x = x_;
 594                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 595                                 if (is_rtl)
 596                                         x = leftMargin();
 597                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 598                                 x -= fm.width(dstr) / 2;
 599                         } else if (is_rtl) {
 600                                 x = width_ - leftMargin() -     fm.width(dstr);
 601                         }
 602                         pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 603                 }
 604         }
 605 }
 606
 607
 608 void RowPainter::paintLast()
 609 {
 610         bool const is_rtl = text_.isRTL(par_);
 611         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 612
 613         // draw an endlabel
 614         switch (endlabel) {
 615         case END_LABEL_BOX:
 616         case END_LABEL_FILLED_BOX: {
 617                 LyXFont const font = getLabelFont();
 618                 FontMetrics const & fm = theApp->fontLoader().metrics(font);
 619                 int const size = int(0.75 * fm.maxAscent());
 620                 int const y = yo_ - size;
 621                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 622
 623                 if (width_ - int(row_.width()) <= size)
 624                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 625
 626                 if (endlabel == END_LABEL_BOX)
 627                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 628                 else
 629                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 630                 break;
 631         }
 632
 633         case END_LABEL_STATIC: {
 634                 LyXFont font = getLabelFont();
 635                 FontMetrics const & fm = theApp->fontLoader().metrics(font);
 636                 string const & str = par_.layout()->endlabelstring();
 637                 docstring dstr(str.begin(), str.end());
 638                 double const x = is_rtl ?
 639                         x_ - fm.width(dstr)
 640                         : - text_.rightMargin(par_) - row_.width();
 641                 pain_.text(int(x), yo_, dstr, font);
 642                 break;
 643         }
 644
 645         case END_LABEL_NO_LABEL:
 646                 break;
 647         }
 648 }
 649
 650
 651 void RowPainter::paintText()
 652 {
 653         pos_type const end = row_.endpos();
 654         pos_type body_pos = par_.beginOfBody();
 655         if (body_pos > 0 &&
 656                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 657                 body_pos = 0;
 658         }
 659
 660         LyXLayout_ptr const & layout = par_.layout();
 661
 662         bool running_strikeout = false;
 663         bool is_struckout = false;
 664         int last_strikeout_x = 0;
 665
 666         // Use font span to speed things up, see below
 667         FontSpan font_span;
 668         LyXFont font;
 669
 670         for (pos_type vpos = row_.pos(); vpos < end; ) {
 671                 if (x_ > bv_.workWidth())
 672                         break;
 673
 674                 pos_type const pos = text_.bidi.vis2log(vpos);
 675
 676                 if (pos >= par_.size()) {
 677                         ++vpos;
 678                         continue;
 679                 }
 680
 681                 // Use font span to speed things up, see above
 682                 if (vpos < font_span.first || vpos > font_span.last) {
 683                         font_span = par_.fontSpan(vpos);
 684                         font = text_.getFont(par_, vpos);
 685                 }
 686
 687                 const int width_pos =
 688                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 689
 690                 if (x_ + width_pos < 0) {
 691                         x_ += width_pos;
 692                         ++vpos;
 693                         continue;
 694                 }
 695
 696                 is_struckout = isDeletedText(par_, pos);
 697
 698                 if (is_struckout && !running_strikeout) {
 699                         running_strikeout = true;
 700                         last_strikeout_x = int(x_);
 701                 }
 702
 703                 bool const highly_editable_inset = par_.isInset(pos)
 704                         && isHighlyEditableInset(par_.getInset(pos));
 705
 706                 // If we reach the end of a struck out range, paint it.
 707                 // We also don't paint across things like tables
 708                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 709                         // Calculate 1/3 height of the buffer's default font
 710                         FontMetrics const & fm = theApp->fontLoader().metrics(
 711                                 bv_.buffer()->params().getFont());
 712                         int const middle = yo_ - fm.maxAscent() / 3;
 713                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 714                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 715                         running_strikeout = false;
 716                 }
 717
 718                 if (body_pos > 0 && pos == body_pos - 1) {
 719                         string lab = layout->labelsep;
 720                         docstring dlab(lab.begin(), lab.end());
 721                         int const lwidth =
 722                                 theApp->fontLoader().metrics(getLabelFont()).width(dlab);
 723
 724                         x_ += label_hfill_ + lwidth - width_pos;
 725                 }
 726
 727                 if (par_.isHfill(pos)) {
 728                         x_ += 1;
 729
 730                         int const y0 = yo_;
 731                         int const y1 = y0 - defaultRowHeight() / 2;
 732
 733                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 734
 735                         if (hfillExpansion(par_, row_, pos)) {
 736                                 int const y2 = (y0 + y1) / 2;
 737
 738                                 if (pos >= body_pos) {
 739                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 740                                                   LColor::added_space,
 741                                                   Painter::line_onoffdash);
 742                                         x_ += hfill_;
 743                                 } else {
 744                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 745                                                   LColor::added_space,
 746                                                   Painter::line_onoffdash);
 747                                         x_ += label_hfill_;
 748                                 }
 749                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 750                         }
 751                         x_ += 2;
 752                         ++vpos;
 753                 } else if (par_.isSeparator(pos)) {
 754                         x_ += width_pos;
 755                         if (pos >= body_pos)
 756                                 x_ += separator_;
 757                         ++vpos;
 758                 } else {
 759                         paintFromPos(vpos);
 760                 }
 761         }
 762
 763         // if we reach the end of a struck out range, paint it
 764         if (running_strikeout) {
 765                 // calculate 1/3 height of the buffer's default font
 766                 FontMetrics const & fm = theApp->fontLoader().metrics(
 767                         bv_.buffer()->params().getFont());
 768                 int const middle = yo_ - fm.maxAscent() / 3;
 769                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 770                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 771                 running_strikeout = false;
 772         }
 773 }
 774
 775
 776 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 777         int x, int y)
 778 {
 779         boost::crc_32_type crc;
 780         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 781                 const unsigned char b[] = { par.getChar(i) };
 782                 crc.process_bytes(b, 1);
 783         }
 784         const unsigned char b[] = { x, y, row.width() };
 785         crc.process_bytes(b, 3);
 786         return crc.checksum();
 787 }
 788
 789
 790 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 791         RowList::const_iterator rit, LyXText const & text)
 792 {
 793         // Is there a cursor on this row (or inside inset on row)
 794         LCursor & cur = pi.base.bv->cursor();
 795         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 796                 CursorSlice const & sl = cur[d];
 797                 if (sl.text() == &text
 798                     && sl.pit() == pit
 799                     && sl.pos() >= rit->pos()
 800                     && sl.pos() <= rit->endpos())
 801                         return true;
 802         }
 803         return false;
 804 }
 805
 806
 807 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 808         RowList::const_iterator rit, LyXText const & text)
 809 {
 810         // Is there a cursor inside an inset on this row, and is this inset
 811         // the only "character" on this row
 812         LCursor & cur = pi.base.bv->cursor();
 813         if (rit->pos() + 1 != rit->endpos())
 814                 return false;
 815         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 816                 CursorSlice const & sl = cur[d];
 817                 if (sl.text() == &text
 818                     && sl.pit() == pit
 819                     && sl.pos() == rit->pos())
 820                         return d < cur.depth() - 1;
 821         }
 822         return false;
 823 }
 824
 825
 826 void paintPar
 827         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 828          bool repaintAll)
 829 {
 830 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 831         static NullPainter nop;
 832         static PainterInfo nullpi(pi.base.bv, nop);
 833         int const ww = pi.base.bv->workHeight();
 834
 835         theCoords.parPos()[&text][pit] = Point(x, y);
 836
 837         Paragraph const & par = text.paragraphs()[pit];
 838         if (par.rows().empty())
 839                 return;
 840
 841         RowList::const_iterator const rb = par.rows().begin();
 842         RowList::const_iterator const re = par.rows().end();
 843
 844         y -= rb->ascent();
 845         lyx::size_type rowno(0);
 846         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 847                 y += rit->ascent();
 848                 // Allow setting of refreshInside for nested insets in
 849                 // this row only
 850                 bool tmp = refreshInside;
 851
 852                 // Row signature; has row changed since last paint?
 853                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 854                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 855
 856                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 857                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 858                         text);
 859
 860                 // If this is the only object on the row, we can make it wide
 861                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 862                         InsetBase const * const in = par.getInset(i);
 863                         if (in) {
 864                                 InsetText const * const t = in->asTextInset();
 865                                 if (t)
 866                                         t->Wide() = in_inset_alone_on_row;
 867                         }
 868                 }
 869
 870                 // If selection is on, the current row signature differs
 871                 // from cache, or cursor is inside an inset _on this row_,
 872                 // then paint the row
 873                 if (repaintAll || row_has_changed || cursor_on_row) {
 874                         // Add to row signature cache
 875                         par.rowSignature()[rowno] = row_sig;
 876
 877                         bool const inside = (y + rit->descent() >= 0
 878                                        && y - rit->ascent() < ww);
 879                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 880                         // Clear background of this row
 881                         // (if paragraph background was not cleared)
 882                         if (!repaintAll &&
 883                             (!in_inset_alone_on_row || row_has_changed)) {
 884                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 885                                     text.maxwidth_, rit->height(),
 886                                     text.backgroundColor());
 887                                 // If outer row has changed, force nested
 888                                 // insets to repaint completely
 889                                 if (row_has_changed)
 890                                         refreshInside = true;
 891                         }
 892
 893                         // Instrumentation for testing row cache (see also
 894                         // 12 lines lower):
 895                         if (text.isMainText())
 896                                 lyxerr[Debug::PAINTING] << "#";
 897                         else
 898                                 lyxerr[Debug::PAINTING] << "[" <<
 899                                     repaintAll << row_has_changed <<
 900                                     cursor_on_row << "]";
 901                         rp.paintAppendix();
 902                         rp.paintDepthBar();
 903                         rp.paintChangeBar();
 904                         if (rit == rb)
 905                                 rp.paintFirst();
 906                         if (rit + 1 == re)
 907                                 rp.paintLast();
 908                         rp.paintText();
 909                 }
 910                 y += rit->descent();
 911                 // Restore, see above
 912                 refreshInside = tmp;
 913         }
 914         lyxerr[Debug::PAINTING] << "." << endl;
 915 }
 916
 917 } // namespace anon
 918
 919
 920 void paintText(BufferView const & bv, ViewMetricsInfo const & vi,
 921                Painter & pain)
 922 {
 923         LyXText & text = bv.buffer()->text();
 924         bool const select = bv.cursor().selection();
 925
 926         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 927         // Should the whole screen, including insets, be refreshed?
 928         bool repaintAll = select || !vi.singlepar;
 929
 930         if (repaintAll) {
 931                 // Clear background (if not delegated to rows)
 932                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 933                         text.backgroundColor());
 934         }
 935         if (select) {
 936                 text.drawSelection(pi, 0, 0);
 937         }
 938
 939         int yy = vi.y1;
 940         // draw contents
 941         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 942                 refreshInside = repaintAll;
 943                 Paragraph const & par = text.getPar(pit);
 944                 yy += par.ascent();
 945                 paintPar(pi, text, pit, 0, yy, repaintAll);
 946                 yy += par.descent();
 947         }
 948
 949         // Cache one paragraph above and one below
 950         // Note MV: this cannot be suppressed even for singlepar.
 951         // Try viewing the User Guide Mobius figure
 952
 953         if (vi.p1 > 0) {
 954                 text.redoParagraph(vi.p1 - 1);
 955                 theCoords.parPos()[&text][vi.p1 - 1] =
 956                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 957         }
 958
 959         if (vi.p2 < lyx::pit_type(text.paragraphs().size()) - 1) {
 960                 text.redoParagraph(vi.p2 + 1);
 961                 theCoords.parPos()[&text][vi.p2 + 1] =
 962                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 963         }
 964
 965         // and grey out above (should not happen later)
 966 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 967         if (vi.y1 > 0 && !vi.singlepar)
 968                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 969
 970         // and possibly grey out below
 971 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 972         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 973                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 974 }
 975
 976
 977 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 978 {
 979 //      lyxerr << "  paintTextInset: y: " << y << endl;
 980
 981         y -= text.getPar(0).ascent();
 982         // This flag can not be set from within same inset:
 983         bool repaintAll = refreshInside;
 984         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 985                 y += text.getPar(pit).ascent();
 986                 paintPar(pi, text, pit, x, y, repaintAll);
 987                 y += text.getPar(pit).descent();
 988         }
 989 }