src/rowpainter.C

   1 /**
   2  * \file rowpainter.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author various
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "rowpainter.h"
  15
  16 #include "buffer.h"
  17 #include "coordcache.h"
  18 #include "cursor.h"
  19 #include "debug.h"
  20 #include "bufferparams.h"
  21 #include "BufferView.h"
  22 #include "encoding.h"
  23 #include "gettext.h"
  24 #include "language.h"
  25 #include "LColor.h"
  26 #include "lyxrc.h"
  27 #include "lyxrow.h"
  28 #include "lyxrow_funcs.h"
  29 #include "metricsinfo.h"
  30 #include "paragraph.h"
  31 #include "paragraph_funcs.h"
  32 #include "ParagraphParameters.h"
  33 #include "vspace.h"
  34
  35 #include "frontends/FontMetrics.h"
  36 #include "frontends/nullpainter.h"
  37 #include "frontends/Painter.h"
  38
  39 #include "insets/insettext.h"
  40
  41 #include "support/textutils.h"
  42
  43 #include <boost/crc.hpp>
  44
  45 using lyx::docstring;
  46 using lyx::frontend::Painter;
  47 using lyx::frontend::NullPainter;
  48 using lyx::frontend::FontMetrics;
  49
  50 using lyx::char_type;
  51 using lyx::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 = theFontMetrics(font).width(c);
 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 = theFontMetrics(font).width(c);
 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         int width = pain_.text(int(x_), yo_, str, font);
 318 #else
 319         int width = pain_.text(int(x_), yo_, &str[0], str.size(), font);
 320 #endif
 321         x_ += width;
 322 }
 323
 324
 325 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 326 {
 327         if (!lyxrc.mark_foreign_language)
 328                 return;
 329         if (font.language() == latex_language)
 330                 return;
 331         if (font.language() == bv_.buffer()->params().language)
 332                 return;
 333
 334         int const y = yo_ + 1 + desc;
 335         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 336 }
 337
 338
 339 void RowPainter::paintFromPos(pos_type & vpos)
 340 {
 341         pos_type const pos = text_.bidi.vis2log(vpos);
 342         LyXFont orig_font = text_.getFont(par_, pos);
 343
 344         double const orig_x = x_;
 345
 346         if (par_.isInset(pos)) {
 347                 paintInset(pos, orig_font);
 348                 ++vpos;
 349                 paintForeignMark(orig_x, orig_font,
 350                         par_.getInset(pos)->descent());
 351                 return;
 352         }
 353
 354         // usual characters, no insets
 355         char_type const c = par_.getChar(pos);
 356
 357         // special case languages
 358         std::string const & lang = orig_font.language()->lang();
 359         bool const hebrew = lang == "hebrew";
 360         bool const arabic = lang == "arabic" &&
 361                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 362                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 363
 364         // draw as many chars as we can
 365         if ((!hebrew && !arabic)
 366                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 367                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 368                 paintChars(vpos, orig_font, hebrew, arabic);
 369         } else if (hebrew) {
 370                 paintHebrewComposeChar(vpos, orig_font);
 371         } else if (arabic) {
 372                 paintArabicComposeChar(vpos, orig_font);
 373         }
 374
 375         paintForeignMark(orig_x, orig_font);
 376 }
 377
 378
 379 void RowPainter::paintChangeBar()
 380 {
 381         pos_type const start = row_.pos();
 382         pos_type const end = row_.endpos();
 383
 384         if (start == end || !par_.isChanged(start, end))
 385                 return;
 386
 387         int const height = text_.isLastRow(pit_, row_)
 388                 ? row_.ascent()
 389                 : row_.height();
 390
 391         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 392 }
 393
 394
 395 void RowPainter::paintAppendix()
 396 {
 397         if (!par_.params().appendix())
 398                 return;
 399
 400         int y = yo_ - row_.ascent();
 401
 402         if (par_.params().startOfAppendix())
 403                 y += 2 * defaultRowHeight();
 404
 405         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 406         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 407 }
 408
 409
 410 void RowPainter::paintDepthBar()
 411 {
 412         Paragraph::depth_type const depth = par_.getDepth();
 413
 414         if (depth <= 0)
 415                 return;
 416
 417         Paragraph::depth_type prev_depth = 0;
 418         if (!text_.isFirstRow(pit_, row_)) {
 419                 pit_type pit2 = pit_;
 420                 if (row_.pos() == 0)
 421                         --pit2;
 422                 prev_depth = pars_[pit2].getDepth();
 423         }
 424
 425         Paragraph::depth_type next_depth = 0;
 426         if (!text_.isLastRow(pit_, row_)) {
 427                 pit_type pit2 = pit_;
 428                 if (row_.endpos() >= pars_[pit2].size())
 429                         ++pit2;
 430                 next_depth = pars_[pit2].getDepth();
 431         }
 432
 433         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 434                 int const w = nestMargin() / 5;
 435                 int x = int(xo_) + w * i;
 436                 // only consider the changebar space if we're drawing outermost text
 437                 if (text_.isMainText())
 438                         x += changebarMargin();
 439
 440                 int const starty = yo_ - row_.ascent();
 441                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 442
 443                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 444
 445                 if (i > prev_depth)
 446                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 447                 if (i > next_depth)
 448                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 449         }
 450 }
 451
 452
 453 int RowPainter::paintAppendixStart(int y)
 454 {
 455         LyXFont pb_font;
 456         pb_font.setColor(LColor::appendix);
 457         pb_font.decSize();
 458
 459         string const label = lyx::to_utf8(_("Appendix"));
 460         int w = 0;
 461         int a = 0;
 462         int d = 0;
 463         docstring dlab(label.begin(), label.end());
 464         theFontMetrics(pb_font).rectText(dlab, w, a, d);
 465
 466         int const text_start = int(xo_ + (width_ - w) / 2);
 467         int const text_end = text_start + w;
 468
 469         pain_.rectText(text_start, y + d, dlab, pb_font, LColor::none, LColor::none);
 470
 471         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 472         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 473
 474         return 3 * defaultRowHeight();
 475 }
 476
 477
 478 void RowPainter::paintFirst()
 479 {
 480         ParagraphParameters const & parparams = par_.params();
 481
 482         int y_top = 0;
 483
 484         // start of appendix?
 485         if (parparams.startOfAppendix())
 486                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 487
 488         Buffer const & buffer = *bv_.buffer();
 489
 490         LyXLayout_ptr const & layout = par_.layout();
 491
 492         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 493                 if (pit_ != 0) {
 494                         if (layout->latextype == LATEX_PARAGRAPH
 495                                 && !par_.getDepth()) {
 496                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 497                         } else {
 498                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 499                                 if (playout->latextype == LATEX_PARAGRAPH
 500                                         && !pars_[pit_ - 1].getDepth()) {
 501                                         // is it right to use defskip here, too? (AS)
 502                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 503                                 }
 504                         }
 505                 }
 506         }
 507
 508         bool const is_rtl = text_.isRTL(par_);
 509         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 510         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 511
 512         // should we print a label?
 513         if (layout->labeltype >= LABEL_STATIC
 514             && (layout->labeltype != LABEL_STATIC
 515                       || layout->latextype != LATEX_ENVIRONMENT
 516                       || is_seq)) {
 517
 518                 LyXFont const font = getLabelFont();
 519                 FontMetrics const & fm = theFontMetrics(font);
 520
 521                 string const str = par_.getLabelstring();
 522                 if (!str.empty()) {
 523                         double x = x_;
 524                         docstring dstr(str.begin(), str.end());
 525
 526                         // this is special code for the chapter layout. This is
 527                         // printed in an extra row and has a pagebreak at
 528                         // the top.
 529                         if (layout->counter == "chapter") {
 530                                 double spacing_val = 1.0;
 531                                 if (!parparams.spacing().isDefault()) {
 532                                         spacing_val = parparams.spacing().getValue();
 533                                 } else {
 534                                         spacing_val = buffer.params().spacing().getValue();
 535                                 }
 536
 537                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 538
 539                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 540                                         + int(layout->parsep) * defaultRowHeight();
 541
 542                                 if (is_rtl) {
 543                                         x = width_ - leftMargin() -
 544                                                 fm.width(dstr);
 545                                 }
 546
 547                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 548                         } else {
 549                                 string lab = layout->labelsep;
 550                                 docstring dlab(lab.begin(), lab.end());
 551                                 if (is_rtl) {
 552                                         x = width_ - leftMargin()
 553                                                 + fm.width(dlab);
 554                                 } else {
 555                                         x = x_ - fm.width(dlab)
 556                                                 - fm.width(dstr);
 557                                 }
 558
 559                                 pain_.text(int(x), yo_, dstr, font);
 560                         }
 561                 }
 562
 563         // the labels at the top of an environment.
 564         // More or less for bibliography
 565         } else if (is_seq &&
 566                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 567                 layout->labeltype == LABEL_BIBLIO ||
 568                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 569                 LyXFont font = getLabelFont();
 570                 if (!par_.getLabelstring().empty()) {
 571                         string const str = par_.getLabelstring();
 572                         docstring dstr(str.begin(), str.end());
 573                         double spacing_val = 1.0;
 574                         if (!parparams.spacing().isDefault())
 575                                 spacing_val = parparams.spacing().getValue();
 576                         else
 577                                 spacing_val = buffer.params().spacing().getValue();
 578
 579                         FontMetrics const & fm = theFontMetrics(font);
 580
 581                         int const labeladdon = int(fm.maxHeight()
 582                                 * layout->spacing.getValue() * spacing_val);
 583
 584                         int maxdesc =
 585                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 586                                 + (layout->labelbottomsep * defaultRowHeight()));
 587
 588                         double x = x_;
 589                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 590                                 if (is_rtl)
 591                                         x = leftMargin();
 592                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 593                                 x -= fm.width(dstr) / 2;
 594                         } else if (is_rtl) {
 595                                 x = width_ - leftMargin() -     fm.width(dstr);
 596                         }
 597                         pain_.text(int(x), yo_ - maxdesc - labeladdon, dstr, font);
 598                 }
 599         }
 600 }
 601
 602
 603 void RowPainter::paintLast()
 604 {
 605         bool const is_rtl = text_.isRTL(par_);
 606         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 607
 608         // draw an endlabel
 609         switch (endlabel) {
 610         case END_LABEL_BOX:
 611         case END_LABEL_FILLED_BOX: {
 612                 LyXFont const font = getLabelFont();
 613                 FontMetrics const & fm = theFontMetrics(font);
 614                 int const size = int(0.75 * fm.maxAscent());
 615                 int const y = yo_ - size;
 616                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 617
 618                 if (width_ - int(row_.width()) <= size)
 619                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 620
 621                 if (endlabel == END_LABEL_BOX)
 622                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 623                 else
 624                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 625                 break;
 626         }
 627
 628         case END_LABEL_STATIC: {
 629                 LyXFont font = getLabelFont();
 630                 FontMetrics const & fm = theFontMetrics(font);
 631                 string const & str = par_.layout()->endlabelstring();
 632                 docstring dstr(str.begin(), str.end());
 633                 double const x = is_rtl ?
 634                         x_ - fm.width(dstr)
 635                         : - text_.rightMargin(par_) - row_.width();
 636                 pain_.text(int(x), yo_, dstr, font);
 637                 break;
 638         }
 639
 640         case END_LABEL_NO_LABEL:
 641                 break;
 642         }
 643 }
 644
 645
 646 void RowPainter::paintText()
 647 {
 648         pos_type const end = row_.endpos();
 649         pos_type body_pos = par_.beginOfBody();
 650         if (body_pos > 0 &&
 651                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 652                 body_pos = 0;
 653         }
 654
 655         LyXLayout_ptr const & layout = par_.layout();
 656
 657         bool running_strikeout = false;
 658         bool is_struckout = false;
 659         int last_strikeout_x = 0;
 660
 661         // Use font span to speed things up, see below
 662         FontSpan font_span;
 663         LyXFont font;
 664
 665         for (pos_type vpos = row_.pos(); vpos < end; ) {
 666                 if (x_ > bv_.workWidth())
 667                         break;
 668
 669                 pos_type const pos = text_.bidi.vis2log(vpos);
 670
 671                 if (pos >= par_.size()) {
 672                         ++vpos;
 673                         continue;
 674                 }
 675
 676                 // Use font span to speed things up, see above
 677                 if (vpos < font_span.first || vpos > font_span.last) {
 678                         font_span = par_.fontSpan(vpos);
 679                         font = text_.getFont(par_, vpos);
 680                 }
 681
 682                 const int width_pos =
 683                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 684
 685                 if (x_ + width_pos < 0) {
 686                         x_ += width_pos;
 687                         ++vpos;
 688                         continue;
 689                 }
 690
 691                 is_struckout = isDeletedText(par_, pos);
 692
 693                 if (is_struckout && !running_strikeout) {
 694                         running_strikeout = true;
 695                         last_strikeout_x = int(x_);
 696                 }
 697
 698                 bool const highly_editable_inset = par_.isInset(pos)
 699                         && isHighlyEditableInset(par_.getInset(pos));
 700
 701                 // If we reach the end of a struck out range, paint it.
 702                 // We also don't paint across things like tables
 703                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 704                         // Calculate 1/3 height of the buffer's default font
 705                         FontMetrics const & fm
 706                                 = theFontMetrics(bv_.buffer()->params().getFont());
 707                         int const middle = yo_ - fm.maxAscent() / 3;
 708                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 709                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 710                         running_strikeout = false;
 711                 }
 712
 713                 if (body_pos > 0 && pos == body_pos - 1) {
 714                         string lab = layout->labelsep;
 715                         docstring dlab(lab.begin(), lab.end());
 716                         int const lwidth
 717                                 = theFontMetrics(getLabelFont()).width(dlab);
 718
 719                         x_ += label_hfill_ + lwidth - width_pos;
 720                 }
 721
 722                 if (par_.isHfill(pos)) {
 723                         x_ += 1;
 724
 725                         int const y0 = yo_;
 726                         int const y1 = y0 - defaultRowHeight() / 2;
 727
 728                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 729
 730                         if (hfillExpansion(par_, row_, pos)) {
 731                                 int const y2 = (y0 + y1) / 2;
 732
 733                                 if (pos >= body_pos) {
 734                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 735                                                   LColor::added_space,
 736                                                   Painter::line_onoffdash);
 737                                         x_ += hfill_;
 738                                 } else {
 739                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 740                                                   LColor::added_space,
 741                                                   Painter::line_onoffdash);
 742                                         x_ += label_hfill_;
 743                                 }
 744                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 745                         }
 746                         x_ += 2;
 747                         ++vpos;
 748                 } else if (par_.isSeparator(pos)) {
 749                         x_ += width_pos;
 750                         if (pos >= body_pos)
 751                                 x_ += separator_;
 752                         ++vpos;
 753                 } else {
 754                         paintFromPos(vpos);
 755                 }
 756         }
 757
 758         // if we reach the end of a struck out range, paint it
 759         if (running_strikeout) {
 760                 // calculate 1/3 height of the buffer's default font
 761                 FontMetrics const & fm
 762                         = theFontMetrics(bv_.buffer()->params().getFont());
 763                 int const middle = yo_ - fm.maxAscent() / 3;
 764                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 765                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 766                 running_strikeout = false;
 767         }
 768 }
 769
 770
 771 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 772         int x, int y)
 773 {
 774         boost::crc_32_type crc;
 775         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 776                 const unsigned char b[] = { par.getChar(i) };
 777                 crc.process_bytes(b, 1);
 778         }
 779         const unsigned char b[] = { x, y, row.width() };
 780         crc.process_bytes(b, 3);
 781         return crc.checksum();
 782 }
 783
 784
 785 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 786         RowList::const_iterator rit, LyXText const & text)
 787 {
 788         // Is there a cursor on this row (or inside inset on row)
 789         LCursor & cur = pi.base.bv->cursor();
 790         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 791                 CursorSlice const & sl = cur[d];
 792                 if (sl.text() == &text
 793                     && sl.pit() == pit
 794                     && sl.pos() >= rit->pos()
 795                     && sl.pos() <= rit->endpos())
 796                         return true;
 797         }
 798         return false;
 799 }
 800
 801
 802 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 803         RowList::const_iterator rit, LyXText const & text)
 804 {
 805         // Is there a cursor inside an inset on this row, and is this inset
 806         // the only "character" on this row
 807         LCursor & cur = pi.base.bv->cursor();
 808         if (rit->pos() + 1 != rit->endpos())
 809                 return false;
 810         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 811                 CursorSlice const & sl = cur[d];
 812                 if (sl.text() == &text
 813                     && sl.pit() == pit
 814                     && sl.pos() == rit->pos())
 815                         return d < cur.depth() - 1;
 816         }
 817         return false;
 818 }
 819
 820
 821 void paintPar
 822         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 823          bool repaintAll)
 824 {
 825 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 826         static NullPainter nop;
 827         static PainterInfo nullpi(pi.base.bv, nop);
 828         int const ww = pi.base.bv->workHeight();
 829
 830         theCoords.parPos()[&text][pit] = Point(x, y);
 831
 832         Paragraph const & par = text.paragraphs()[pit];
 833         if (par.rows().empty())
 834                 return;
 835
 836         RowList::const_iterator const rb = par.rows().begin();
 837         RowList::const_iterator const re = par.rows().end();
 838
 839         y -= rb->ascent();
 840         lyx::size_type rowno(0);
 841         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 842                 y += rit->ascent();
 843                 // Allow setting of refreshInside for nested insets in
 844                 // this row only
 845                 bool tmp = refreshInside;
 846
 847                 // Row signature; has row changed since last paint?
 848                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 849                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 850
 851                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 852                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 853                         text);
 854
 855                 // If this is the only object on the row, we can make it wide
 856                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 857                         InsetBase const * const in = par.getInset(i);
 858                         if (in) {
 859                                 InsetText const * const t = in->asTextInset();
 860                                 if (t)
 861                                         t->Wide() = in_inset_alone_on_row;
 862                         }
 863                 }
 864
 865                 // If selection is on, the current row signature differs
 866                 // from cache, or cursor is inside an inset _on this row_,
 867                 // then paint the row
 868                 if (repaintAll || row_has_changed || cursor_on_row) {
 869                         // Add to row signature cache
 870                         par.rowSignature()[rowno] = row_sig;
 871
 872                         bool const inside = (y + rit->descent() >= 0
 873                                        && y - rit->ascent() < ww);
 874                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 875                         // Clear background of this row
 876                         // (if paragraph background was not cleared)
 877                         if (!repaintAll &&
 878                             (!in_inset_alone_on_row || row_has_changed)) {
 879                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 880                                     text.maxwidth_, rit->height(),
 881                                     text.backgroundColor());
 882                                 // If outer row has changed, force nested
 883                                 // insets to repaint completely
 884                                 if (row_has_changed)
 885                                         refreshInside = true;
 886                         }
 887
 888                         // Instrumentation for testing row cache (see also
 889                         // 12 lines lower):
 890                         if (text.isMainText())
 891                                 lyxerr[Debug::PAINTING] << "#";
 892                         else
 893                                 lyxerr[Debug::PAINTING] << "[" <<
 894                                     repaintAll << row_has_changed <<
 895                                     cursor_on_row << "]";
 896                         rp.paintAppendix();
 897                         rp.paintDepthBar();
 898                         rp.paintChangeBar();
 899                         if (rit == rb)
 900                                 rp.paintFirst();
 901                         if (rit + 1 == re)
 902                                 rp.paintLast();
 903                         rp.paintText();
 904                 }
 905                 y += rit->descent();
 906                 // Restore, see above
 907                 refreshInside = tmp;
 908         }
 909         lyxerr[Debug::PAINTING] << "." << endl;
 910 }
 911
 912 } // namespace anon
 913
 914
 915 void paintText(BufferView const & bv, ViewMetricsInfo const & vi,
 916                Painter & pain)
 917 {
 918         LyXText & text = bv.buffer()->text();
 919         bool const select = bv.cursor().selection();
 920
 921         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 922         // Should the whole screen, including insets, be refreshed?
 923         bool repaintAll = select || !vi.singlepar;
 924
 925         if (repaintAll) {
 926                 // Clear background (if not delegated to rows)
 927                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 928                         text.backgroundColor());
 929         }
 930         if (select) {
 931                 text.drawSelection(pi, 0, 0);
 932         }
 933
 934         int yy = vi.y1;
 935         // draw contents
 936         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 937                 refreshInside = repaintAll;
 938                 Paragraph const & par = text.getPar(pit);
 939                 yy += par.ascent();
 940                 paintPar(pi, text, pit, 0, yy, repaintAll);
 941                 yy += par.descent();
 942         }
 943
 944         // Cache one paragraph above and one below
 945         // Note MV: this cannot be suppressed even for singlepar.
 946         // Try viewing the User Guide Mobius figure
 947
 948         if (vi.p1 > 0) {
 949                 text.redoParagraph(vi.p1 - 1);
 950                 theCoords.parPos()[&text][vi.p1 - 1] =
 951                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 952         }
 953
 954         if (vi.p2 < lyx::pit_type(text.paragraphs().size()) - 1) {
 955                 text.redoParagraph(vi.p2 + 1);
 956                 theCoords.parPos()[&text][vi.p2 + 1] =
 957                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 958         }
 959
 960         // and grey out above (should not happen later)
 961 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 962         if (vi.y1 > 0 && !vi.singlepar)
 963                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 964
 965         // and possibly grey out below
 966 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 967         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 968                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 969 }
 970
 971
 972 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 973 {
 974 //      lyxerr << "  paintTextInset: y: " << y << endl;
 975
 976         y -= text.getPar(0).ascent();
 977         // This flag can not be set from within same inset:
 978         bool repaintAll = refreshInside;
 979         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 980                 y += text.getPar(pit).ascent();
 981                 paintPar(pi, text, pit, x, y, repaintAll);
 982                 y += text.getPar(pit).descent();
 983         }
 984 }