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/LyXView.h"
  38 #include "frontends/WorkArea.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::char_type;
  51 using lyx::pos_type;
  52 using lyx::pit_type;
  53
  54 using std::endl;
  55 using std::max;
  56 using std::min;
  57 using std::string;
  58
  59
  60 namespace {
  61
  62 /// Flag: do a full redraw of inside text of inset
  63 /// Working variable indicating a full screen refresh
  64 bool refreshInside;
  65
  66 /**
  67  * A class used for painting an individual row of text.
  68  */
  69 class RowPainter {
  70 public:
  71         /// initialise and run painter
  72         RowPainter(PainterInfo & pi, LyXText const & text,
  73                 pit_type pit, Row const & row, int x, int y);
  74
  75         // paint various parts
  76         void paintAppendix();
  77         void paintDepthBar();
  78         void paintChangeBar();
  79         void paintFirst();
  80         void paintLast();
  81         void paintText();
  82
  83 private:
  84         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  85         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  86         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  87         void paintChars(lyx::pos_type & vpos, LyXFont font,
  88                         bool hebrew, bool arabic);
  89         int paintAppendixStart(int y);
  90         void paintFromPos(lyx::pos_type & vpos);
  91         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  92
  93         /// return left margin
  94         int leftMargin() const;
  95
  96         /// return the label font for this row
  97         LyXFont const getLabelFont() const;
  98
  99         /// bufferview to paint on
 100         BufferView const & bv_;
 101
 102         /// Painter to use
 103         Painter & pain_;
 104
 105         /// LyXText for the row
 106         LyXText const & text_;
 107         ParagraphList const & pars_;
 108
 109         /// The row to paint
 110         Row const & row_;
 111
 112         /// Row's paragraph
 113         pit_type const pit_;
 114         Paragraph const & par_;
 115
 116         /// is row erased? (change tracking)
 117         bool erased_;
 118
 119         // Looks ugly - is
 120         double const xo_;
 121         int const yo_;    // current baseline
 122         double x_;
 123         int width_;
 124         double separator_;
 125         double hfill_;
 126         double label_hfill_;
 127 };
 128
 129
 130 RowPainter::RowPainter(PainterInfo & pi,
 131         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 132         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 133           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 134           erased_(pi.erased_),
 135           xo_(x), yo_(y), width_(text_.width())
 136 {
 137         RowMetrics m = text_.computeRowMetrics(pit, row_);
 138         x_ = m.x + xo_;
 139
 140         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 141         //row_.dump();
 142
 143         separator_ = m.separator;
 144         hfill_ = m.hfill;
 145         label_hfill_ = m.label_hfill;
 146
 147         BOOST_ASSERT(pit >= 0);
 148         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 149 }
 150
 151
 152 LyXFont const RowPainter::getLabelFont() const
 153 {
 154         return text_.getLabelFont(par_);
 155 }
 156
 157
 158 int RowPainter::leftMargin() const
 159 {
 160         return text_.leftMargin(pit_, row_.pos());
 161 }
 162
 163
 164 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 165 {
 166         InsetBase const * inset = par_.getInset(pos);
 167         BOOST_ASSERT(inset);
 168         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 169         // FIXME: We should always use font, see documentation of
 170         // noFontChange() in insetbase.h.
 171         pi.base.font = inset->noFontChange() ?
 172                 bv_.buffer()->params().getFont() :
 173                 font;
 174         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 175         pi.erased_ = erased_ || isDeletedText(par_, pos);
 176         theCoords.insets().add(inset, int(x_), yo_);
 177         InsetText const * const in = inset->asTextInset();
 178         // non-wide insets are painted completely. Recursive
 179         bool tmp = refreshInside;
 180         if (!in || !in->Wide()) {
 181                 refreshInside = true;
 182                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 183         }
 184         if (refreshInside)
 185                 inset->drawSelection(pi, int(x_), yo_);
 186         inset->draw(pi, int(x_), yo_);
 187         refreshInside = tmp;
 188         x_ += inset->width();
 189 }
 190
 191
 192 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 193 {
 194         pos_type pos = text_.bidi.vis2log(vpos);
 195
 196         string str;
 197
 198         // first char
 199         char_type c = par_.getChar(pos);
 200         str += c;
 201         ++vpos;
 202
 203         int const width = font_metrics::width(c, font);
 204         int dx = 0;
 205
 206         for (pos_type i = pos - 1; i >= 0; --i) {
 207                 c = par_.getChar(i);
 208                 if (!Encodings::isComposeChar_hebrew(c)) {
 209                         if (isPrintableNonspace(c)) {
 210                                 int const width2 =
 211                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 212                                 // dalet / resh
 213                                 dx = (c == 'ø' || c == 'ã')
 214                                         ? width2 - width
 215                                         : (width2 - width) / 2;
 216                         }
 217                         break;
 218                 }
 219         }
 220
 221         // Draw nikud
 222         docstring dstr(str.begin(), str.end());
 223         pain_.text(int(x_) + dx, yo_, dstr, font);
 224 }
 225
 226
 227 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 228 {
 229         pos_type pos = text_.bidi.vis2log(vpos);
 230         string str;
 231
 232         // first char
 233         char_type c = par_.getChar(pos);
 234         c = par_.transformChar(c, pos);
 235         str += c;
 236         ++vpos;
 237
 238         int const width = font_metrics::width(c, font);
 239         int dx = 0;
 240
 241         for (pos_type i = pos - 1; i >= 0; --i) {
 242                 c = par_.getChar(i);
 243                 if (!Encodings::isComposeChar_arabic(c)) {
 244                         if (isPrintableNonspace(c)) {
 245                                 int const width2 =
 246                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 247                                 dx = (width2 - width) / 2;
 248                         }
 249                         break;
 250                 }
 251         }
 252         // Draw nikud
 253         docstring dstr(str.begin(), str.end());
 254         pain_.text(int(x_) + dx, yo_, dstr, font);
 255 }
 256
 257
 258 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 259                             bool hebrew, bool arabic)
 260 {
 261         pos_type pos = text_.bidi.vis2log(vpos);
 262         pos_type const end = row_.endpos();
 263         FontSpan const font_span = par_.fontSpan(pos);
 264         Change::Type const prev_change = par_.lookupChange(pos).type;
 265
 266         // first character
 267 #if 0
 268         string str;
 269         str += par_.getChar(pos);
 270 #else
 271         std::vector<char_type> str;
 272         str.push_back(par_.getChar(pos));
 273 #endif
 274         if (arabic) {
 275                 char_type c = str[0];
 276                 str[0] = par_.transformChar(c, pos);
 277         }
 278
 279         // collect as much similar chars as we can
 280         for (++vpos ; vpos < end ; ++vpos) {
 281                 pos = text_.bidi.vis2log(vpos);
 282                 if (pos < font_span.first || pos > font_span.last)
 283                         break;
 284
 285                 if (prev_change != par_.lookupChange(pos))
 286                         break;
 287
 288                 char_type c = par_.getChar(pos);
 289
 290                 if (!isPrintableNonspace(c))
 291                         break;
 292
 293                 if (arabic && Encodings::isComposeChar_arabic(c))
 294                         break;
 295
 296                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 297                         break;
 298
 299                 if (arabic)
 300                         c = par_.transformChar(c, pos);
 301
 302 #if 0
 303                 str += c;
 304 #else
 305                 str.push_back(c);
 306 #endif
 307         }
 308
 309         if (prev_change == Change::DELETED)
 310                 font.setColor(LColor::strikeout);
 311         else if (prev_change == Change::INSERTED)
 312                 font.setColor(LColor::newtext);
 313
 314         // Draw text and set the new x position
 315         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 316 #if 0
 317         pain_.text(int(x_), yo_, str, font);
 318         x_ += font_metrics::width(str, font);
 319 #else
 320         pain_.text(int(x_), yo_, &str[0], str.size(), font);
 321         x_ += font_metrics::width(&str[0], str.size(), font);
 322 #endif
 323 }
 324
 325
 326 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 327 {
 328         if (!lyxrc.mark_foreign_language)
 329                 return;
 330         if (font.language() == latex_language)
 331                 return;
 332         if (font.language() == bv_.buffer()->params().language)
 333                 return;
 334
 335         int const y = yo_ + 1 + desc;
 336         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 337 }
 338
 339
 340 void RowPainter::paintFromPos(pos_type & vpos)
 341 {
 342         pos_type const pos = text_.bidi.vis2log(vpos);
 343         LyXFont orig_font = text_.getFont(par_, pos);
 344
 345         double const orig_x = x_;
 346
 347         if (par_.isInset(pos)) {
 348                 paintInset(pos, orig_font);
 349                 ++vpos;
 350                 paintForeignMark(orig_x, orig_font,
 351                         par_.getInset(pos)->descent());
 352                 return;
 353         }
 354
 355         // usual characters, no insets
 356         char_type const c = par_.getChar(pos);
 357
 358         // special case languages
 359         std::string const & lang = orig_font.language()->lang();
 360         bool const hebrew = lang == "hebrew";
 361         bool const arabic = lang == "arabic" &&
 362                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 363                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 364
 365         // draw as many chars as we can
 366         if ((!hebrew && !arabic)
 367                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 368                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 369                 paintChars(vpos, orig_font, hebrew, arabic);
 370         } else if (hebrew) {
 371                 paintHebrewComposeChar(vpos, orig_font);
 372         } else if (arabic) {
 373                 paintArabicComposeChar(vpos, orig_font);
 374         }
 375
 376         paintForeignMark(orig_x, orig_font);
 377 }
 378
 379
 380 void RowPainter::paintChangeBar()
 381 {
 382         pos_type const start = row_.pos();
 383         pos_type const end = row_.endpos();
 384
 385         if (start == end || !par_.isChanged(start, end))
 386                 return;
 387
 388         int const height = text_.isLastRow(pit_, row_)
 389                 ? row_.ascent()
 390                 : row_.height();
 391
 392         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 393 }
 394
 395
 396 void RowPainter::paintAppendix()
 397 {
 398         if (!par_.params().appendix())
 399                 return;
 400
 401         int y = yo_ - row_.ascent();
 402
 403         if (par_.params().startOfAppendix())
 404                 y += 2 * defaultRowHeight();
 405
 406         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 407         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 408 }
 409
 410
 411 void RowPainter::paintDepthBar()
 412 {
 413         Paragraph::depth_type const depth = par_.getDepth();
 414
 415         if (depth <= 0)
 416                 return;
 417
 418         Paragraph::depth_type prev_depth = 0;
 419         if (!text_.isFirstRow(pit_, row_)) {
 420                 pit_type pit2 = pit_;
 421                 if (row_.pos() == 0)
 422                         --pit2;
 423                 prev_depth = pars_[pit2].getDepth();
 424         }
 425
 426         Paragraph::depth_type next_depth = 0;
 427         if (!text_.isLastRow(pit_, row_)) {
 428                 pit_type pit2 = pit_;
 429                 if (row_.endpos() >= pars_[pit2].size())
 430                         ++pit2;
 431                 next_depth = pars_[pit2].getDepth();
 432         }
 433
 434         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 435                 int const w = nestMargin() / 5;
 436                 int x = int(xo_) + w * i;
 437                 // only consider the changebar space if we're drawing outermost text
 438                 if (text_.isMainText())
 439                         x += changebarMargin();
 440
 441                 int const starty = yo_ - row_.ascent();
 442                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 443
 444                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 445
 446                 if (i > prev_depth)
 447                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 448                 if (i > next_depth)
 449                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 450         }
 451 }
 452
 453
 454 int RowPainter::paintAppendixStart(int y)
 455 {
 456         LyXFont pb_font;
 457         pb_font.setColor(LColor::appendix);
 458         pb_font.decSize();
 459
 460         string const label = _("Appendix");
 461         int w = 0;
 462         int a = 0;
 463         int d = 0;
 464         docstring dlab(label.begin(), label.end());
 465         font_metrics::rectText(dlab, pb_font, w, a, d);
 466
 467         int const text_start = int(xo_ + (width_ - w) / 2);
 468         int const text_end = text_start + w;
 469
 470         pain_.rectText(text_start, y + d, dlab, pb_font, LColor::none, LColor::none);
 471
 472         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 473         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 474
 475         return 3 * defaultRowHeight();
 476 }
 477
 478
 479 void RowPainter::paintFirst()
 480 {
 481         ParagraphParameters const & parparams = par_.params();
 482
 483         int y_top = 0;
 484
 485         // start of appendix?
 486         if (parparams.startOfAppendix())
 487                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 488
 489         Buffer const & buffer = *bv_.buffer();
 490
 491         LyXLayout_ptr const & layout = par_.layout();
 492
 493         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 494                 if (pit_ != 0) {
 495                         if (layout->latextype == LATEX_PARAGRAPH
 496                                 && !par_.getDepth()) {
 497                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 498                         } else {
 499                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 500                                 if (playout->latextype == LATEX_PARAGRAPH
 501                                         && !pars_[pit_ - 1].getDepth()) {
 502                                         // is it right to use defskip here, too? (AS)
 503                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 504                                 }
 505                         }
 506                 }
 507         }
 508
 509         bool const is_rtl = text_.isRTL(par_);
 510         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 511         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 512
 513         // should we print a label?
 514         if (layout->labeltype >= LABEL_STATIC
 515             && (layout->labeltype != LABEL_STATIC
 516                       || layout->latextype != LATEX_ENVIRONMENT
 517                       || is_seq)) {
 518
 519                 LyXFont const font = getLabelFont();
 520                 string const str = par_.getLabelstring();
 521                 if (!str.empty()) {
 522                         double x = x_;
 523                         docstring dstr(str.begin(), str.end());
 524
 525                         // this is special code for the chapter layout. This is
 526                         // printed in an extra row and has a pagebreak at
 527                         // the top.
 528                         if (layout->counter == "chapter") {
 529                                 double spacing_val = 1.0;
 530                                 if (!parparams.spacing().isDefault()) {
 531                                         spacing_val = parparams.spacing().getValue();
 532                                 } else {
 533                                         spacing_val = buffer.params().spacing().getValue();
 534                                 }
 535
 536                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 537
 538                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 539                                         + int(layout->parsep) * defaultRowHeight();
 540
 541                                 if (is_rtl) {
 542                                         x = width_ - leftMargin() -
 543                                                 font_metrics::width(dstr, font);
 544                                 }
 545
 546                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 547                         } else {
 548                                 string lab = layout->labelsep;
 549                                 docstring dlab(lab.begin(), lab.end());
 550                                 if (is_rtl) {
 551                                         x = width_ - leftMargin()
 552                                                 + font_metrics::width(dlab, font);
 553                                 } else {
 554                                         x = x_ - font_metrics::width(dlab, font)
 555                                                 - font_metrics::width(dstr, font);
 556                                 }
 557
 558                                 pain_.text(int(x), yo_, dstr, font);
 559                         }
 560                 }
 561
 562         // the labels at the top of an environment.
 563         // More or less for bibliography
 564         } else if (is_seq &&
 565                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 566                 layout->labeltype == LABEL_BIBLIO ||
 567                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 568                 LyXFont font = getLabelFont();
 569                 if (!par_.getLabelstring().empty()) {
 570                         string const str = par_.getLabelstring();
 571                         docstring dstr(str.begin(), str.end());
 572                         double spacing_val = 1.0;
 573                         if (!parparams.spacing().isDefault())
 574                                 spacing_val = parparams.spacing().getValue();
 575                         else
 576                                 spacing_val = buffer.params().spacing().getValue();
 577
 578                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 579
 580                         int maxdesc =
 581                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 582                                 + (layout->labelbottomsep * defaultRowHeight()));
 583
 584                         double x = x_;
 585                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 586                                 if (is_rtl)
 587                                         x = leftMargin();
 588                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 589                                 x -= font_metrics::width(dstr, font) / 2;
 590                         } else if (is_rtl) {
 591                                 x = width_ - leftMargin() -
 592                                         font_metrics::width(dstr, font);
 593                         }
 594                         pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 595                 }
 596         }
 597 }
 598
 599
 600 void RowPainter::paintLast()
 601 {
 602         bool const is_rtl = text_.isRTL(par_);
 603         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 604
 605         // draw an endlabel
 606         switch (endlabel) {
 607         case END_LABEL_BOX:
 608         case END_LABEL_FILLED_BOX: {
 609                 LyXFont const font = getLabelFont();
 610                 int const size = int(0.75 * font_metrics::maxAscent(font));
 611                 int const y = yo_ - size;
 612                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 613
 614                 if (width_ - int(row_.width()) <= size)
 615                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 616
 617                 if (endlabel == END_LABEL_BOX)
 618                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 619                 else
 620                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 621                 break;
 622         }
 623
 624         case END_LABEL_STATIC: {
 625                 LyXFont font = getLabelFont();
 626                 string const & str = par_.layout()->endlabelstring();
 627                 docstring dstr(str.begin(), str.end());
 628                 double const x = is_rtl ?
 629                         x_ - font_metrics::width(dstr, font)
 630                         : - text_.rightMargin(par_) - row_.width();
 631                 pain_.text(int(x), yo_, dstr, font);
 632                 break;
 633         }
 634
 635         case END_LABEL_NO_LABEL:
 636                 break;
 637         }
 638 }
 639
 640
 641 void RowPainter::paintText()
 642 {
 643         pos_type const end = row_.endpos();
 644         pos_type body_pos = par_.beginOfBody();
 645         if (body_pos > 0 &&
 646                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 647                 body_pos = 0;
 648         }
 649
 650         LyXLayout_ptr const & layout = par_.layout();
 651
 652         bool running_strikeout = false;
 653         bool is_struckout = false;
 654         int last_strikeout_x = 0;
 655
 656         // Use font span to speed things up, see below
 657         FontSpan font_span;
 658         LyXFont font;
 659
 660         for (pos_type vpos = row_.pos(); vpos < end; ) {
 661                 if (x_ > bv_.workWidth())
 662                         break;
 663
 664                 pos_type const pos = text_.bidi.vis2log(vpos);
 665
 666                 if (pos >= par_.size()) {
 667                         ++vpos;
 668                         continue;
 669                 }
 670
 671                 // Use font span to speed things up, see above
 672                 if (vpos < font_span.first || vpos > font_span.last) {
 673                         font_span = par_.fontSpan(vpos);
 674                         font = text_.getFont(par_, vpos);
 675                 }
 676
 677                 const int width_pos =
 678                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 679
 680                 if (x_ + width_pos < 0) {
 681                         x_ += width_pos;
 682                         ++vpos;
 683                         continue;
 684                 }
 685
 686                 is_struckout = isDeletedText(par_, pos);
 687
 688                 if (is_struckout && !running_strikeout) {
 689                         running_strikeout = true;
 690                         last_strikeout_x = int(x_);
 691                 }
 692
 693                 bool const highly_editable_inset = par_.isInset(pos)
 694                         && isHighlyEditableInset(par_.getInset(pos));
 695
 696                 // If we reach the end of a struck out range, paint it.
 697                 // We also don't paint across things like tables
 698                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 699                         // Calculate 1/3 height of the buffer's default font
 700                         int const middle =
 701                                 yo_ -
 702                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 703                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 704                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 705                         running_strikeout = false;
 706                 }
 707
 708                 if (body_pos > 0 && pos == body_pos - 1) {
 709                         string lab = layout->labelsep;
 710                         docstring dlab(lab.begin(), lab.end());
 711                         int const lwidth = font_metrics::width(dlab,
 712                                 getLabelFont());
 713
 714                         x_ += label_hfill_ + lwidth - width_pos;
 715                 }
 716
 717                 if (par_.isHfill(pos)) {
 718                         x_ += 1;
 719
 720                         int const y0 = yo_;
 721                         int const y1 = y0 - defaultRowHeight() / 2;
 722
 723                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 724
 725                         if (hfillExpansion(par_, row_, pos)) {
 726                                 int const y2 = (y0 + y1) / 2;
 727
 728                                 if (pos >= body_pos) {
 729                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 730                                                   LColor::added_space,
 731                                                   Painter::line_onoffdash);
 732                                         x_ += hfill_;
 733                                 } else {
 734                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 735                                                   LColor::added_space,
 736                                                   Painter::line_onoffdash);
 737                                         x_ += label_hfill_;
 738                                 }
 739                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 740                         }
 741                         x_ += 2;
 742                         ++vpos;
 743                 } else if (par_.isSeparator(pos)) {
 744                         x_ += width_pos;
 745                         if (pos >= body_pos)
 746                                 x_ += separator_;
 747                         ++vpos;
 748                 } else {
 749                         paintFromPos(vpos);
 750                 }
 751         }
 752
 753         // if we reach the end of a struck out range, paint it
 754         if (running_strikeout) {
 755                 // calculate 1/3 height of the buffer's default font
 756                 int const middle =
 757                         yo_ -
 758                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 759                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 760                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 761                 running_strikeout = false;
 762         }
 763 }
 764
 765
 766 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 767         int x, int y)
 768 {
 769         boost::crc_32_type crc;
 770         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 771                 const unsigned char b[] = { par.getChar(i) };
 772                 crc.process_bytes(b, 1);
 773         }
 774         const unsigned char b[] = { x, y, row.width() };
 775         crc.process_bytes(b, 3);
 776         return crc.checksum();
 777 }
 778
 779
 780 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 781         RowList::const_iterator rit, LyXText const & text)
 782 {
 783         // Is there a cursor on this row (or inside inset on row)
 784         LCursor & cur = pi.base.bv->cursor();
 785         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 786                 CursorSlice const & sl = cur[d];
 787                 if (sl.text() == &text
 788                     && sl.pit() == pit
 789                     && sl.pos() >= rit->pos()
 790                     && sl.pos() <= rit->endpos())
 791                         return true;
 792         }
 793         return false;
 794 }
 795
 796
 797 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 798         RowList::const_iterator rit, LyXText const & text)
 799 {
 800         // Is there a cursor inside an inset on this row, and is this inset
 801         // the only "character" on this row
 802         LCursor & cur = pi.base.bv->cursor();
 803         if (rit->pos() + 1 != rit->endpos())
 804                 return false;
 805         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 806                 CursorSlice const & sl = cur[d];
 807                 if (sl.text() == &text
 808                     && sl.pit() == pit
 809                     && sl.pos() == rit->pos())
 810                         return d < cur.depth() - 1;
 811         }
 812         return false;
 813 }
 814
 815
 816 void paintPar
 817         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 818          bool repaintAll)
 819 {
 820 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 821         static NullPainter nop;
 822         static PainterInfo nullpi(pi.base.bv, nop);
 823         int const ww = pi.base.bv->workHeight();
 824
 825         theCoords.parPos()[&text][pit] = Point(x, y);
 826
 827         Paragraph const & par = text.paragraphs()[pit];
 828         if (par.rows().empty())
 829                 return;
 830
 831         RowList::const_iterator const rb = par.rows().begin();
 832         RowList::const_iterator const re = par.rows().end();
 833
 834         y -= rb->ascent();
 835         lyx::size_type rowno(0);
 836         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 837                 y += rit->ascent();
 838                 // Allow setting of refreshInside for nested insets in
 839                 // this row only
 840                 bool tmp = refreshInside;
 841
 842                 // Row signature; has row changed since last paint?
 843                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 844                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 845
 846                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 847                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 848                         text);
 849
 850                 // If this is the only object on the row, we can make it wide
 851                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 852                         InsetBase const * const in = par.getInset(i);
 853                         if (in) {
 854                                 InsetText const * const t = in->asTextInset();
 855                                 if (t)
 856                                         t->Wide() = in_inset_alone_on_row;
 857                         }
 858                 }
 859
 860                 // If selection is on, the current row signature differs
 861                 // from cache, or cursor is inside an inset _on this row_,
 862                 // then paint the row
 863                 if (repaintAll || row_has_changed || cursor_on_row) {
 864                         // Add to row signature cache
 865                         par.rowSignature()[rowno] = row_sig;
 866
 867                         bool const inside = (y + rit->descent() >= 0
 868                                        && y - rit->ascent() < ww);
 869                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 870                         // Clear background of this row
 871                         // (if paragraph background was not cleared)
 872                         if (!repaintAll &&
 873                             (!in_inset_alone_on_row || row_has_changed)) {
 874                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 875                                     text.maxwidth_, rit->height(),
 876                                     text.backgroundColor());
 877                                 // If outer row has changed, force nested
 878                                 // insets to repaint completely
 879                                 if (row_has_changed)
 880                                         refreshInside = true;
 881                         }
 882
 883                         // Instrumentation for testing row cache (see also
 884                         // 12 lines lower):
 885                         if (text.isMainText())
 886                                 lyxerr[Debug::PAINTING] << "#";
 887                         else
 888                                 lyxerr[Debug::PAINTING] << "[" <<
 889                                     repaintAll << row_has_changed <<
 890                                     cursor_on_row << "]";
 891                         rp.paintAppendix();
 892                         rp.paintDepthBar();
 893                         rp.paintChangeBar();
 894                         if (rit == rb)
 895                                 rp.paintFirst();
 896                         if (rit + 1 == re)
 897                                 rp.paintLast();
 898                         rp.paintText();
 899                 }
 900                 y += rit->descent();
 901                 // Restore, see above
 902                 refreshInside = tmp;
 903         }
 904         lyxerr[Debug::PAINTING] << "." << endl;
 905 }
 906
 907 } // namespace anon
 908
 909
 910 void paintText(BufferView const & bv, ViewMetricsInfo const & vi,
 911                Painter & pain)
 912 {
 913         LyXText * const text = bv.text();
 914         bool const select = bv.cursor().selection();
 915
 916         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 917         // Should the whole screen, including insets, be refreshed?
 918         bool repaintAll = select || !vi.singlepar;
 919
 920         if (repaintAll) {
 921                 // Clear background (if not delegated to rows)
 922                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 923                         text->backgroundColor());
 924         }
 925         if (select) {
 926                 text->drawSelection(pi, 0, 0);
 927         }
 928
 929         int yy = vi.y1;
 930         // draw contents
 931         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 932                 refreshInside = repaintAll;
 933                 Paragraph const & par = text->getPar(pit);
 934                 yy += par.ascent();
 935                 paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
 936                 yy += par.descent();
 937         }
 938
 939         // Cache one paragraph above and one below
 940         // Note MV: this cannot be suppressed even for singlepar.
 941         // Try viewing the User Guide Mobius figure
 942
 943         if (vi.p1 > 0) {
 944                 text->redoParagraph(vi.p1 - 1);
 945                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 946                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 947         }
 948
 949         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 950                 text->redoParagraph(vi.p2 + 1);
 951                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 952                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 953         }
 954
 955         // and grey out above (should not happen later)
 956 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 957         if (vi.y1 > 0 && !vi.singlepar)
 958                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 959
 960         // and possibly grey out below
 961 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 962         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 963                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 964 }
 965
 966
 967 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 968 {
 969 //      lyxerr << "  paintTextInset: y: " << y << endl;
 970
 971         y -= text.getPar(0).ascent();
 972         // This flag can not be set from within same inset:
 973         bool repaintAll = refreshInside;
 974         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 975                 y += text.getPar(pit).ascent();
 976                 paintPar(pi, text, pit, x, y, repaintAll);
 977                 y += text.getPar(pit).descent();
 978         }
 979 }