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::pit_type;
  52 using lyx::pos_type;
  53 using lyx::Point;
  54
  55 using std::endl;
  56 using std::max;
  57 using std::min;
  58 using std::string;
  59
  60
  61 namespace {
  62
  63 /// Flag: do a full redraw of inside text of inset
  64 /// Working variable indicating a full screen refresh
  65 bool refreshInside;
  66
  67 /**
  68  * A class used for painting an individual row of text.
  69  */
  70 class RowPainter {
  71 public:
  72         /// initialise and run painter
  73         RowPainter(PainterInfo & pi, LyXText const & text,
  74                 pit_type pit, Row const & row, int x, int y);
  75
  76         // paint various parts
  77         void paintAppendix();
  78         void paintDepthBar();
  79         void paintChangeBar();
  80         void paintFirst();
  81         void paintLast();
  82         void paintText();
  83
  84 private:
  85         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  86         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  87         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  88         void paintChars(lyx::pos_type & vpos, LyXFont font,
  89                         bool hebrew, bool arabic);
  90         int paintAppendixStart(int y);
  91         void paintFromPos(lyx::pos_type & vpos);
  92         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  93
  94         /// return left margin
  95         int leftMargin() const;
  96
  97         /// return the label font for this row
  98         LyXFont const getLabelFont() const;
  99
 100         /// bufferview to paint on
 101         BufferView & bv_;
 102
 103         /// Painter to use
 104         Painter & pain_;
 105
 106         /// LyXText for the row
 107         LyXText const & text_;
 108         ParagraphList const & pars_;
 109
 110         /// The row to paint
 111         Row const & row_;
 112
 113         /// Row's paragraph
 114         pit_type const pit_;
 115         Paragraph const & par_;
 116
 117         /// is row erased? (change tracking)
 118         bool erased_;
 119
 120         // Looks ugly - is
 121         double const xo_;
 122         int const yo_;    // current baseline
 123         double x_;
 124         int width_;
 125         double separator_;
 126         double hfill_;
 127         double label_hfill_;
 128 };
 129
 130
 131 RowPainter::RowPainter(PainterInfo & pi,
 132         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 133         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 134           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 135           erased_(pi.erased_),
 136           xo_(x), yo_(y), width_(text_.width())
 137 {
 138         RowMetrics m = text_.computeRowMetrics(pit, row_);
 139         x_ = m.x + xo_;
 140
 141         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 142         //row_.dump();
 143
 144         separator_ = m.separator;
 145         hfill_ = m.hfill;
 146         label_hfill_ = m.label_hfill;
 147
 148         BOOST_ASSERT(pit >= 0);
 149         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 150 }
 151
 152
 153 LyXFont const RowPainter::getLabelFont() const
 154 {
 155         return text_.getLabelFont(par_);
 156 }
 157
 158
 159 int RowPainter::leftMargin() const
 160 {
 161         return text_.leftMargin(pit_, row_.pos());
 162 }
 163
 164
 165 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 166 {
 167         InsetBase const * inset = par_.getInset(pos);
 168         BOOST_ASSERT(inset);
 169         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 170         // FIXME: We should always use font, see documentation of
 171         // noFontChange() in insetbase.h.
 172         pi.base.font = inset->noFontChange() ?
 173                 bv_.buffer()->params().getFont() :
 174                 font;
 175         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 176         pi.erased_ = erased_ || par_.isDeleted(pos);
 177         bv_.coordCache().insets().add(inset, int(x_), yo_);
 178         InsetText const * const in = inset->asTextInset();
 179         // non-wide insets are painted completely. Recursive
 180         bool tmp = refreshInside;
 181         if (!in || !in->Wide()) {
 182                 refreshInside = true;
 183                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 184         }
 185         if (refreshInside)
 186                 inset->drawSelection(pi, int(x_), yo_);
 187         inset->draw(pi, int(x_), yo_);
 188         refreshInside = tmp;
 189         x_ += inset->width();
 190 }
 191
 192
 193 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 194 {
 195         pos_type pos = text_.bidi.vis2log(vpos);
 196
 197         docstring str;
 198
 199         // first char
 200         char_type c = par_.getChar(pos);
 201         str += c;
 202         ++vpos;
 203
 204         int const width = theFontMetrics(font).width(c);
 205         int dx = 0;
 206
 207         for (pos_type i = pos - 1; i >= 0; --i) {
 208                 c = par_.getChar(i);
 209                 if (!Encodings::isComposeChar_hebrew(c)) {
 210                         if (isPrintableNonspace(c)) {
 211                                 int const width2 =
 212                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 213                                 // FIXME UNICODE
 214                                 // This does not work anymore, and non-ascii
 215                                 // characters in source files are forbidden
 216                                 // anyway.
 217                                 // dalet / resh
 218                                 dx = (c == 'ø' || c == 'ã')
 219                                         ? width2 - width
 220                                         : (width2 - width) / 2;
 221                         }
 222                         break;
 223                 }
 224         }
 225
 226         // Draw nikud
 227         // FIXME UNICODE
 228         pain_.text(int(x_) + dx, yo_, str, font);
 229 }
 230
 231
 232 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 233 {
 234         pos_type pos = text_.bidi.vis2log(vpos);
 235         docstring str;
 236
 237         // first char
 238         char_type c = par_.getChar(pos);
 239         c = par_.transformChar(c, pos);
 240         str += c;
 241         ++vpos;
 242
 243         int const width = theFontMetrics(font).width(c);
 244         int dx = 0;
 245
 246         for (pos_type i = pos - 1; i >= 0; --i) {
 247                 c = par_.getChar(i);
 248                 if (!Encodings::isComposeChar_arabic(c)) {
 249                         if (isPrintableNonspace(c)) {
 250                                 int const width2 =
 251                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 252                                 dx = (width2 - width) / 2;
 253                         }
 254                         break;
 255                 }
 256         }
 257         // Draw nikud
 258         pain_.text(int(x_) + dx, yo_, str, font);
 259 }
 260
 261
 262 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 263                             bool hebrew, bool arabic)
 264 {
 265         pos_type pos = text_.bidi.vis2log(vpos);
 266         pos_type const end = row_.endpos();
 267         FontSpan const font_span = par_.fontSpan(pos);
 268         Change::Type const prev_change = par_.lookupChange(pos).type;
 269
 270         // first character
 271 #if 0
 272         string str;
 273         str += par_.getChar(pos);
 274 #else
 275         std::vector<char_type> str;
 276         str.push_back(par_.getChar(pos));
 277 #endif
 278         if (arabic) {
 279                 char_type c = str[0];
 280                 str[0] = par_.transformChar(c, pos);
 281         }
 282
 283         // collect as much similar chars as we can
 284         for (++vpos ; vpos < end ; ++vpos) {
 285                 pos = text_.bidi.vis2log(vpos);
 286                 if (pos < font_span.first || pos > font_span.last)
 287                         break;
 288
 289                 // FIXME: change tracking (MG)
 290                 if (Change(prev_change) != par_.lookupChange(pos))
 291                         break;
 292
 293                 char_type c = par_.getChar(pos);
 294
 295                 if (!isPrintableNonspace(c))
 296                         break;
 297
 298                 if (arabic && Encodings::isComposeChar_arabic(c))
 299                         break;
 300
 301                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 302                         break;
 303
 304                 if (arabic)
 305                         c = par_.transformChar(c, pos);
 306
 307 #if 0
 308                 str += c;
 309 #else
 310                 str.push_back(c);
 311 #endif
 312         }
 313
 314         if (prev_change == Change::DELETED)
 315                 font.setColor(LColor::strikeout);
 316         else if (prev_change == Change::INSERTED)
 317                 font.setColor(LColor::newtext);
 318
 319         // Draw text and set the new x position
 320         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 321 #if 0
 322         int width = pain_.text(int(x_), yo_, str, font);
 323 #else
 324         int width = pain_.text(int(x_), yo_, &str[0], str.size(), font);
 325 #endif
 326         x_ += width;
 327 }
 328
 329
 330 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 331 {
 332         if (!lyxrc.mark_foreign_language)
 333                 return;
 334         if (font.language() == latex_language)
 335                 return;
 336         if (font.language() == bv_.buffer()->params().language)
 337                 return;
 338
 339         int const y = yo_ + 1 + desc;
 340         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 341 }
 342
 343
 344 void RowPainter::paintFromPos(pos_type & vpos)
 345 {
 346         pos_type const pos = text_.bidi.vis2log(vpos);
 347         LyXFont orig_font = text_.getFont(par_, pos);
 348
 349         double const orig_x = x_;
 350
 351         if (par_.isInset(pos)) {
 352                 paintInset(pos, orig_font);
 353                 ++vpos;
 354                 paintForeignMark(orig_x, orig_font,
 355                         par_.getInset(pos)->descent());
 356                 return;
 357         }
 358
 359         // usual characters, no insets
 360         char_type const c = par_.getChar(pos);
 361
 362         // special case languages
 363         std::string const & lang = orig_font.language()->lang();
 364         bool const hebrew = lang == "hebrew";
 365         bool const arabic = lang == "arabic" &&
 366                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 367                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 368
 369         // draw as many chars as we can
 370         if ((!hebrew && !arabic)
 371                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 372                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 373                 paintChars(vpos, orig_font, hebrew, arabic);
 374         } else if (hebrew) {
 375                 paintHebrewComposeChar(vpos, orig_font);
 376         } else if (arabic) {
 377                 paintArabicComposeChar(vpos, orig_font);
 378         }
 379
 380         paintForeignMark(orig_x, orig_font);
 381 }
 382
 383
 384 void RowPainter::paintChangeBar()
 385 {
 386         pos_type const start = row_.pos();
 387         pos_type const end = row_.endpos();
 388
 389         if (start == end || !par_.isChanged(start, end))
 390                 return;
 391
 392         int const height = text_.isLastRow(pit_, row_)
 393                 ? row_.ascent()
 394                 : row_.height();
 395
 396         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 397 }
 398
 399
 400 void RowPainter::paintAppendix()
 401 {
 402         if (!par_.params().appendix())
 403                 return;
 404
 405         int y = yo_ - row_.ascent();
 406
 407         if (par_.params().startOfAppendix())
 408                 y += 2 * defaultRowHeight();
 409
 410         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 411         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 412 }
 413
 414
 415 void RowPainter::paintDepthBar()
 416 {
 417         Paragraph::depth_type const depth = par_.getDepth();
 418
 419         if (depth <= 0)
 420                 return;
 421
 422         Paragraph::depth_type prev_depth = 0;
 423         if (!text_.isFirstRow(pit_, row_)) {
 424                 pit_type pit2 = pit_;
 425                 if (row_.pos() == 0)
 426                         --pit2;
 427                 prev_depth = pars_[pit2].getDepth();
 428         }
 429
 430         Paragraph::depth_type next_depth = 0;
 431         if (!text_.isLastRow(pit_, row_)) {
 432                 pit_type pit2 = pit_;
 433                 if (row_.endpos() >= pars_[pit2].size())
 434                         ++pit2;
 435                 next_depth = pars_[pit2].getDepth();
 436         }
 437
 438         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 439                 int const w = nestMargin() / 5;
 440                 int x = int(xo_) + w * i;
 441                 // only consider the changebar space if we're drawing outermost text
 442                 if (text_.isMainText())
 443                         x += changebarMargin();
 444
 445                 int const starty = yo_ - row_.ascent();
 446                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 447
 448                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 449
 450                 if (i > prev_depth)
 451                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 452                 if (i > next_depth)
 453                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 454         }
 455 }
 456
 457
 458 int RowPainter::paintAppendixStart(int y)
 459 {
 460         LyXFont pb_font;
 461         pb_font.setColor(LColor::appendix);
 462         pb_font.decSize();
 463
 464         int w = 0;
 465         int a = 0;
 466         int d = 0;
 467
 468         docstring const label = _("Appendix");
 469         theFontMetrics(pb_font).rectText(label, w, a, d);
 470
 471         int const text_start = int(xo_ + (width_ - w) / 2);
 472         int const text_end = text_start + w;
 473
 474         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 475
 476         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 477         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 478
 479         return 3 * defaultRowHeight();
 480 }
 481
 482
 483 void RowPainter::paintFirst()
 484 {
 485         ParagraphParameters const & parparams = par_.params();
 486
 487         int y_top = 0;
 488
 489         // start of appendix?
 490         if (parparams.startOfAppendix())
 491                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 492
 493         Buffer const & buffer = *bv_.buffer();
 494
 495         LyXLayout_ptr const & layout = par_.layout();
 496
 497         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 498                 if (pit_ != 0) {
 499                         if (layout->latextype == LATEX_PARAGRAPH
 500                                 && !par_.getDepth()) {
 501                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 502                         } else {
 503                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 504                                 if (playout->latextype == LATEX_PARAGRAPH
 505                                         && !pars_[pit_ - 1].getDepth()) {
 506                                         // is it right to use defskip here, too? (AS)
 507                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 508                                 }
 509                         }
 510                 }
 511         }
 512
 513         bool const is_rtl = text_.isRTL(par_);
 514         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 515         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 516
 517         // should we print a label?
 518         if (layout->labeltype >= LABEL_STATIC
 519             && (layout->labeltype != LABEL_STATIC
 520                       || layout->latextype != LATEX_ENVIRONMENT
 521                       || is_seq)) {
 522
 523                 LyXFont const font = getLabelFont();
 524                 FontMetrics const & fm = theFontMetrics(font);
 525
 526                 // FIXME UNICODE
 527                 docstring const str = lyx::from_utf8(par_.getLabelstring());
 528                 if (!str.empty()) {
 529                         double x = x_;
 530
 531                         // this is special code for the chapter layout. This is
 532                         // printed in an extra row and has a pagebreak at
 533                         // the top.
 534                         if (layout->counter == "chapter") {
 535                                 double spacing_val = 1.0;
 536                                 if (!parparams.spacing().isDefault()) {
 537                                         spacing_val = parparams.spacing().getValue();
 538                                 } else {
 539                                         spacing_val = buffer.params().spacing().getValue();
 540                                 }
 541
 542                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 543
 544                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 545                                         + int(layout->parsep) * defaultRowHeight();
 546
 547                                 if (is_rtl) {
 548                                         x = width_ - leftMargin() -
 549                                                 fm.width(str);
 550                                 }
 551
 552                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 553                         } else {
 554                                 // FIXME UNICODE
 555                                 docstring lab = lyx::from_utf8(layout->labelsep);
 556                                 if (is_rtl) {
 557                                         x = width_ - leftMargin()
 558                                                 + fm.width(lab);
 559                                 } else {
 560                                         x = x_ - fm.width(lab)
 561                                                 - fm.width(str);
 562                                 }
 563
 564                                 pain_.text(int(x), yo_, str, font);
 565                         }
 566                 }
 567
 568         // the labels at the top of an environment.
 569         // More or less for bibliography
 570         } else if (is_seq &&
 571                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 572                 layout->labeltype == LABEL_BIBLIO ||
 573                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 574                 LyXFont font = getLabelFont();
 575                 if (!par_.getLabelstring().empty()) {
 576                         docstring const str = lyx::from_utf8(par_.getLabelstring());
 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 = theFontMetrics(font);
 584
 585                         int const labeladdon = int(fm.maxHeight()
 586                                 * layout->spacing.getValue() * spacing_val);
 587
 588                         int maxdesc =
 589                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 590                                 + (layout->labelbottomsep * defaultRowHeight()));
 591
 592                         double x = x_;
 593                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 594                                 if (is_rtl)
 595                                         x = leftMargin();
 596                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 597                                 x -= fm.width(str) / 2;
 598                         } else if (is_rtl) {
 599                                 x = width_ - leftMargin() -     fm.width(str);
 600                         }
 601                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 602                 }
 603         }
 604 }
 605
 606
 607 void RowPainter::paintLast()
 608 {
 609         bool const is_rtl = text_.isRTL(par_);
 610         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 611
 612         // draw an endlabel
 613         switch (endlabel) {
 614         case END_LABEL_BOX:
 615         case END_LABEL_FILLED_BOX: {
 616                 LyXFont const font = getLabelFont();
 617                 FontMetrics const & fm = theFontMetrics(font);
 618                 int const size = int(0.75 * fm.maxAscent());
 619                 int const y = yo_ - size;
 620                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 621
 622                 if (width_ - int(row_.width()) <= size)
 623                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 624
 625                 if (endlabel == END_LABEL_BOX)
 626                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 627                 else
 628                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 629                 break;
 630         }
 631
 632         case END_LABEL_STATIC: {
 633                 LyXFont font = getLabelFont();
 634                 FontMetrics const & fm = theFontMetrics(font);
 635                 // FIXME UNICODE
 636                 docstring const & str = lyx::from_utf8(par_.layout()->endlabelstring());
 637                 double const x = is_rtl ?
 638                         x_ - fm.width(str)
 639                         : - text_.rightMargin(par_) - row_.width();
 640                 pain_.text(int(x), yo_, str, font);
 641                 break;
 642         }
 643
 644         case END_LABEL_NO_LABEL:
 645                 break;
 646         }
 647 }
 648
 649
 650 void RowPainter::paintText()
 651 {
 652         pos_type const end = row_.endpos();
 653         pos_type body_pos = par_.beginOfBody();
 654         if (body_pos > 0 &&
 655                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 656                 body_pos = 0;
 657         }
 658
 659         LyXLayout_ptr const & layout = par_.layout();
 660
 661         bool running_strikeout = false;
 662         bool is_struckout = false;
 663         int last_strikeout_x = 0;
 664
 665         // Use font span to speed things up, see below
 666         FontSpan font_span;
 667         LyXFont font;
 668
 669         for (pos_type vpos = row_.pos(); vpos < end; ) {
 670                 if (x_ > bv_.workWidth())
 671                         break;
 672
 673                 pos_type const pos = text_.bidi.vis2log(vpos);
 674
 675                 if (pos >= par_.size()) {
 676                         ++vpos;
 677                         continue;
 678                 }
 679
 680                 // Use font span to speed things up, see above
 681                 if (vpos < font_span.first || vpos > font_span.last) {
 682                         font_span = par_.fontSpan(vpos);
 683                         font = text_.getFont(par_, vpos);
 684                 }
 685
 686                 const int width_pos =
 687                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 688
 689                 if (x_ + width_pos < 0) {
 690                         x_ += width_pos;
 691                         ++vpos;
 692                         continue;
 693                 }
 694
 695                 is_struckout = par_.isDeleted(pos);
 696
 697                 if (is_struckout && !running_strikeout) {
 698                         running_strikeout = true;
 699                         last_strikeout_x = int(x_);
 700                 }
 701
 702                 bool const highly_editable_inset = par_.isInset(pos)
 703                         && isHighlyEditableInset(par_.getInset(pos));
 704
 705                 // If we reach the end of a struck out range, paint it.
 706                 // We also don't paint across things like tables
 707                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 708                         // Calculate 1/3 height of the buffer's default font
 709                         FontMetrics const & fm
 710                                 = theFontMetrics(bv_.buffer()->params().getFont());
 711                         int const middle = yo_ - fm.maxAscent() / 3;
 712                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 713                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 714                         running_strikeout = false;
 715                 }
 716
 717                 if (body_pos > 0 && pos == body_pos - 1) {
 718                         // FIXME UNICODE
 719                         int const lwidth = theFontMetrics(getLabelFont())
 720                                 .width(lyx::from_utf8(layout->labelsep));
 721
 722                         x_ += label_hfill_ + lwidth - width_pos;
 723                 }
 724
 725                 if (par_.isHfill(pos)) {
 726                         x_ += 1;
 727
 728                         int const y0 = yo_;
 729                         int const y1 = y0 - defaultRowHeight() / 2;
 730
 731                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 732
 733                         if (hfillExpansion(par_, row_, pos)) {
 734                                 int const y2 = (y0 + y1) / 2;
 735
 736                                 if (pos >= body_pos) {
 737                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 738                                                   LColor::added_space,
 739                                                   Painter::line_onoffdash);
 740                                         x_ += hfill_;
 741                                 } else {
 742                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 743                                                   LColor::added_space,
 744                                                   Painter::line_onoffdash);
 745                                         x_ += label_hfill_;
 746                                 }
 747                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 748                         }
 749                         x_ += 2;
 750                         ++vpos;
 751                 } else if (par_.isSeparator(pos)) {
 752                         x_ += width_pos;
 753                         if (pos >= body_pos)
 754                                 x_ += separator_;
 755                         ++vpos;
 756                 } else {
 757                         paintFromPos(vpos);
 758                 }
 759         }
 760
 761         // if we reach the end of a struck out range, paint it
 762         if (running_strikeout) {
 763                 // calculate 1/3 height of the buffer's default font
 764                 FontMetrics const & fm
 765                         = theFontMetrics(bv_.buffer()->params().getFont());
 766                 int const middle = yo_ - fm.maxAscent() / 3;
 767                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 768                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 769                 running_strikeout = false;
 770         }
 771 }
 772
 773
 774 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 775         int x, int y)
 776 {
 777         boost::crc_32_type crc;
 778         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 779                 const unsigned char b[] = { par.getChar(i) };
 780                 crc.process_bytes(b, 1);
 781         }
 782         const unsigned char b[] = { x, y, row.width() };
 783         crc.process_bytes(b, 3);
 784         return crc.checksum();
 785 }
 786
 787
 788 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 789         RowList::const_iterator rit, LyXText const & text)
 790 {
 791         // Is there a cursor on this row (or inside inset on row)
 792         LCursor & cur = pi.base.bv->cursor();
 793         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 794                 CursorSlice const & sl = cur[d];
 795                 if (sl.text() == &text
 796                     && sl.pit() == pit
 797                     && sl.pos() >= rit->pos()
 798                     && sl.pos() <= rit->endpos())
 799                         return true;
 800         }
 801         return false;
 802 }
 803
 804
 805 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 806         RowList::const_iterator rit, LyXText const & text)
 807 {
 808         // Is there a cursor inside an inset on this row, and is this inset
 809         // the only "character" on this row
 810         LCursor & cur = pi.base.bv->cursor();
 811         if (rit->pos() + 1 != rit->endpos())
 812                 return false;
 813         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 814                 CursorSlice const & sl = cur[d];
 815                 if (sl.text() == &text
 816                     && sl.pit() == pit
 817                     && sl.pos() == rit->pos())
 818                         return d < cur.depth() - 1;
 819         }
 820         return false;
 821 }
 822
 823
 824 void paintPar
 825         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 826          bool repaintAll)
 827 {
 828 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 829         static NullPainter nop;
 830         static PainterInfo nullpi(pi.base.bv, nop);
 831         int const ww = pi.base.bv->workHeight();
 832
 833         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 834
 835         Paragraph const & par = text.paragraphs()[pit];
 836         if (par.rows().empty())
 837                 return;
 838
 839         RowList::const_iterator const rb = par.rows().begin();
 840         RowList::const_iterator const re = par.rows().end();
 841
 842         y -= rb->ascent();
 843         lyx::size_type rowno(0);
 844         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 845                 y += rit->ascent();
 846                 // Allow setting of refreshInside for nested insets in
 847                 // this row only
 848                 bool tmp = refreshInside;
 849
 850                 // Row signature; has row changed since last paint?
 851                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 852                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 853
 854                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 855                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 856                         text);
 857
 858                 // If this is the only object on the row, we can make it wide
 859                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 860                         InsetBase const * const in = par.getInset(i);
 861                         if (in) {
 862                                 InsetText const * const t = in->asTextInset();
 863                                 if (t)
 864                                         t->Wide() = in_inset_alone_on_row;
 865                         }
 866                 }
 867
 868                 // If selection is on, the current row signature differs
 869                 // from cache, or cursor is inside an inset _on this row_,
 870                 // then paint the row
 871                 if (repaintAll || row_has_changed || cursor_on_row) {
 872                         // Add to row signature cache
 873                         par.rowSignature()[rowno] = row_sig;
 874
 875                         bool const inside = (y + rit->descent() >= 0
 876                                        && y - rit->ascent() < ww);
 877                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 878                         // Clear background of this row
 879                         // (if paragraph background was not cleared)
 880                         if (!repaintAll &&
 881                             (!in_inset_alone_on_row || row_has_changed)) {
 882                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 883                                     text.maxwidth_, rit->height(),
 884                                     text.backgroundColor());
 885                                 // If outer row has changed, force nested
 886                                 // insets to repaint completely
 887                                 if (row_has_changed)
 888                                         refreshInside = true;
 889                         }
 890
 891                         // Instrumentation for testing row cache (see also
 892                         // 12 lines lower):
 893                         if (text.isMainText())
 894                                 lyxerr[Debug::PAINTING] << "#";
 895                         else
 896                                 lyxerr[Debug::PAINTING] << "[" <<
 897                                     repaintAll << row_has_changed <<
 898                                     cursor_on_row << "]";
 899                         rp.paintAppendix();
 900                         rp.paintDepthBar();
 901                         rp.paintChangeBar();
 902                         if (rit == rb)
 903                                 rp.paintFirst();
 904                         if (rit + 1 == re)
 905                                 rp.paintLast();
 906                         rp.paintText();
 907                 }
 908                 y += rit->descent();
 909                 // Restore, see above
 910                 refreshInside = tmp;
 911         }
 912         lyxerr[Debug::PAINTING] << "." << endl;
 913 }
 914
 915 } // namespace anon
 916
 917
 918 void paintText(BufferView & bv, ViewMetricsInfo const & vi,
 919                Painter & pain)
 920 {
 921         LyXText & text = bv.buffer()->text();
 922         bool const select = bv.cursor().selection();
 923
 924         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 925         // Should the whole screen, including insets, be refreshed?
 926         bool repaintAll = select || !vi.singlepar;
 927
 928         if (repaintAll) {
 929                 // Clear background (if not delegated to rows)
 930                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 931                         text.backgroundColor());
 932         }
 933         if (select) {
 934                 text.drawSelection(pi, 0, 0);
 935         }
 936
 937         int yy = vi.y1;
 938         // draw contents
 939         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 940                 refreshInside = repaintAll;
 941                 Paragraph const & par = text.getPar(pit);
 942                 yy += par.ascent();
 943                 paintPar(pi, text, pit, 0, yy, repaintAll);
 944                 yy += par.descent();
 945         }
 946
 947         // Cache one paragraph above and one below
 948         // Note MV: this cannot be suppressed even for singlepar.
 949         // Try viewing the User Guide Mobius figure
 950
 951         if (vi.p1 > 0) {
 952                 text.redoParagraph(vi.p1 - 1);
 953                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 954                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 955         }
 956
 957         if (vi.p2 < lyx::pit_type(text.paragraphs().size()) - 1) {
 958                 text.redoParagraph(vi.p2 + 1);
 959                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 960                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 961         }
 962
 963         // and grey out above (should not happen later)
 964 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 965         if (vi.y1 > 0 && !vi.singlepar)
 966                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 967
 968         // and possibly grey out below
 969 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 970         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 971                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 972 }
 973
 974
 975 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 976 {
 977 //      lyxerr << "  paintTextInset: y: " << y << endl;
 978
 979         y -= text.getPar(0).ascent();
 980         // This flag can not be set from within same inset:
 981         bool repaintAll = refreshInside;
 982         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 983                 y += text.getPar(pit).ascent();
 984                 paintPar(pi, text, pit, x, y, repaintAll);
 985                 y += text.getPar(pit).descent();
 986         }
 987 }