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_ || isDeletedText(par_, 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                                 // dalet / resh
 214                                 dx = (c == 'ø' || c == 'ã')
 215                                         ? width2 - width
 216                                         : (width2 - width) / 2;
 217                         }
 218                         break;
 219                 }
 220         }
 221
 222         // Draw nikud
 223         // FIXME UNICODE
 224         pain_.text(int(x_) + dx, yo_, str, font);
 225 }
 226
 227
 228 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 229 {
 230         pos_type pos = text_.bidi.vis2log(vpos);
 231         docstring str;
 232
 233         // first char
 234         char_type c = par_.getChar(pos);
 235         c = par_.transformChar(c, pos);
 236         str += c;
 237         ++vpos;
 238
 239         int const width = theFontMetrics(font).width(c);
 240         int dx = 0;
 241
 242         for (pos_type i = pos - 1; i >= 0; --i) {
 243                 c = par_.getChar(i);
 244                 if (!Encodings::isComposeChar_arabic(c)) {
 245                         if (isPrintableNonspace(c)) {
 246                                 int const width2 =
 247                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 248                                 dx = (width2 - width) / 2;
 249                         }
 250                         break;
 251                 }
 252         }
 253         // Draw nikud
 254         pain_.text(int(x_) + dx, yo_, str, 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                 // FIXME: change tracking (MG)
 286                 if (Change(prev_change) != par_.lookupChange(pos))
 287                         break;
 288
 289                 char_type c = par_.getChar(pos);
 290
 291                 if (!isPrintableNonspace(c))
 292                         break;
 293
 294                 if (arabic && Encodings::isComposeChar_arabic(c))
 295                         break;
 296
 297                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 298                         break;
 299
 300                 if (arabic)
 301                         c = par_.transformChar(c, pos);
 302
 303 #if 0
 304                 str += c;
 305 #else
 306                 str.push_back(c);
 307 #endif
 308         }
 309
 310         if (prev_change == Change::DELETED)
 311                 font.setColor(LColor::strikeout);
 312         else if (prev_change == Change::INSERTED)
 313                 font.setColor(LColor::newtext);
 314
 315         // Draw text and set the new x position
 316         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 317 #if 0
 318         int width = pain_.text(int(x_), yo_, str, font);
 319 #else
 320         int width = pain_.text(int(x_), yo_, &str[0], str.size(), font);
 321 #endif
 322         x_ += width;
 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(5, yo_ - row_.ascent(), 3, 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         int w = 0;
 461         int a = 0;
 462         int d = 0;
 463
 464         docstring const label = _("Appendix");
 465         theFontMetrics(pb_font).rectText(label, 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, label, 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                 FontMetrics const & fm = theFontMetrics(font);
 521
 522                 // FIXME UNICODE
 523                 docstring const str = lyx::from_utf8(par_.getLabelstring());
 524                 if (!str.empty()) {
 525                         double x = x_;
 526
 527                         // this is special code for the chapter layout. This is
 528                         // printed in an extra row and has a pagebreak at
 529                         // the top.
 530                         if (layout->counter == "chapter") {
 531                                 double spacing_val = 1.0;
 532                                 if (!parparams.spacing().isDefault()) {
 533                                         spacing_val = parparams.spacing().getValue();
 534                                 } else {
 535                                         spacing_val = buffer.params().spacing().getValue();
 536                                 }
 537
 538                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 539
 540                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 541                                         + int(layout->parsep) * defaultRowHeight();
 542
 543                                 if (is_rtl) {
 544                                         x = width_ - leftMargin() -
 545                                                 fm.width(str);
 546                                 }
 547
 548                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 549                         } else {
 550                                 // FIXME UNICODE
 551                                 docstring lab = lyx::from_utf8(layout->labelsep);
 552                                 if (is_rtl) {
 553                                         x = width_ - leftMargin()
 554                                                 + fm.width(lab);
 555                                 } else {
 556                                         x = x_ - fm.width(lab)
 557                                                 - fm.width(str);
 558                                 }
 559
 560                                 pain_.text(int(x), yo_, str, font);
 561                         }
 562                 }
 563
 564         // the labels at the top of an environment.
 565         // More or less for bibliography
 566         } else if (is_seq &&
 567                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 568                 layout->labeltype == LABEL_BIBLIO ||
 569                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 570                 LyXFont font = getLabelFont();
 571                 if (!par_.getLabelstring().empty()) {
 572                         docstring const str = lyx::from_utf8(par_.getLabelstring());
 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(str) / 2;
 594                         } else if (is_rtl) {
 595                                 x = width_ - leftMargin() -     fm.width(str);
 596                         }
 597                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, 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                 // FIXME UNICODE
 632                 docstring const & str = lyx::from_utf8(par_.layout()->endlabelstring());
 633                 double const x = is_rtl ?
 634                         x_ - fm.width(str)
 635                         : - text_.rightMargin(par_) - row_.width();
 636                 pain_.text(int(x), yo_, str, 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                         // FIXME UNICODE
 715                         int const lwidth = theFontMetrics(getLabelFont())
 716                                 .width(lyx::from_utf8(layout->labelsep));
 717
 718                         x_ += label_hfill_ + lwidth - width_pos;
 719                 }
 720
 721                 if (par_.isHfill(pos)) {
 722                         x_ += 1;
 723
 724                         int const y0 = yo_;
 725                         int const y1 = y0 - defaultRowHeight() / 2;
 726
 727                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 728
 729                         if (hfillExpansion(par_, row_, pos)) {
 730                                 int const y2 = (y0 + y1) / 2;
 731
 732                                 if (pos >= body_pos) {
 733                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 734                                                   LColor::added_space,
 735                                                   Painter::line_onoffdash);
 736                                         x_ += hfill_;
 737                                 } else {
 738                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 739                                                   LColor::added_space,
 740                                                   Painter::line_onoffdash);
 741                                         x_ += label_hfill_;
 742                                 }
 743                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 744                         }
 745                         x_ += 2;
 746                         ++vpos;
 747                 } else if (par_.isSeparator(pos)) {
 748                         x_ += width_pos;
 749                         if (pos >= body_pos)
 750                                 x_ += separator_;
 751                         ++vpos;
 752                 } else {
 753                         paintFromPos(vpos);
 754                 }
 755         }
 756
 757         // if we reach the end of a struck out range, paint it
 758         if (running_strikeout) {
 759                 // calculate 1/3 height of the buffer's default font
 760                 FontMetrics const & fm
 761                         = theFontMetrics(bv_.buffer()->params().getFont());
 762                 int const middle = yo_ - fm.maxAscent() / 3;
 763                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 764                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 765                 running_strikeout = false;
 766         }
 767 }
 768
 769
 770 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 771         int x, int y)
 772 {
 773         boost::crc_32_type crc;
 774         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 775                 const unsigned char b[] = { par.getChar(i) };
 776                 crc.process_bytes(b, 1);
 777         }
 778         const unsigned char b[] = { x, y, row.width() };
 779         crc.process_bytes(b, 3);
 780         return crc.checksum();
 781 }
 782
 783
 784 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 785         RowList::const_iterator rit, LyXText const & text)
 786 {
 787         // Is there a cursor on this row (or inside inset on row)
 788         LCursor & cur = pi.base.bv->cursor();
 789         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 790                 CursorSlice const & sl = cur[d];
 791                 if (sl.text() == &text
 792                     && sl.pit() == pit
 793                     && sl.pos() >= rit->pos()
 794                     && sl.pos() <= rit->endpos())
 795                         return true;
 796         }
 797         return false;
 798 }
 799
 800
 801 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 802         RowList::const_iterator rit, LyXText const & text)
 803 {
 804         // Is there a cursor inside an inset on this row, and is this inset
 805         // the only "character" on this row
 806         LCursor & cur = pi.base.bv->cursor();
 807         if (rit->pos() + 1 != rit->endpos())
 808                 return false;
 809         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 810                 CursorSlice const & sl = cur[d];
 811                 if (sl.text() == &text
 812                     && sl.pit() == pit
 813                     && sl.pos() == rit->pos())
 814                         return d < cur.depth() - 1;
 815         }
 816         return false;
 817 }
 818
 819
 820 void paintPar
 821         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 822          bool repaintAll)
 823 {
 824 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 825         static NullPainter nop;
 826         static PainterInfo nullpi(pi.base.bv, nop);
 827         int const ww = pi.base.bv->workHeight();
 828
 829         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 830
 831         Paragraph const & par = text.paragraphs()[pit];
 832         if (par.rows().empty())
 833                 return;
 834
 835         RowList::const_iterator const rb = par.rows().begin();
 836         RowList::const_iterator const re = par.rows().end();
 837
 838         y -= rb->ascent();
 839         lyx::size_type rowno(0);
 840         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 841                 y += rit->ascent();
 842                 // Allow setting of refreshInside for nested insets in
 843                 // this row only
 844                 bool tmp = refreshInside;
 845
 846                 // Row signature; has row changed since last paint?
 847                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 848                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 849
 850                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 851                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 852                         text);
 853
 854                 // If this is the only object on the row, we can make it wide
 855                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 856                         InsetBase const * const in = par.getInset(i);
 857                         if (in) {
 858                                 InsetText const * const t = in->asTextInset();
 859                                 if (t)
 860                                         t->Wide() = in_inset_alone_on_row;
 861                         }
 862                 }
 863
 864                 // If selection is on, the current row signature differs
 865                 // from cache, or cursor is inside an inset _on this row_,
 866                 // then paint the row
 867                 if (repaintAll || row_has_changed || cursor_on_row) {
 868                         // Add to row signature cache
 869                         par.rowSignature()[rowno] = row_sig;
 870
 871                         bool const inside = (y + rit->descent() >= 0
 872                                        && y - rit->ascent() < ww);
 873                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 874                         // Clear background of this row
 875                         // (if paragraph background was not cleared)
 876                         if (!repaintAll &&
 877                             (!in_inset_alone_on_row || row_has_changed)) {
 878                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 879                                     text.maxwidth_, rit->height(),
 880                                     text.backgroundColor());
 881                                 // If outer row has changed, force nested
 882                                 // insets to repaint completely
 883                                 if (row_has_changed)
 884                                         refreshInside = true;
 885                         }
 886
 887                         // Instrumentation for testing row cache (see also
 888                         // 12 lines lower):
 889                         if (text.isMainText())
 890                                 lyxerr[Debug::PAINTING] << "#";
 891                         else
 892                                 lyxerr[Debug::PAINTING] << "[" <<
 893                                     repaintAll << row_has_changed <<
 894                                     cursor_on_row << "]";
 895                         rp.paintAppendix();
 896                         rp.paintDepthBar();
 897                         rp.paintChangeBar();
 898                         if (rit == rb)
 899                                 rp.paintFirst();
 900                         if (rit + 1 == re)
 901                                 rp.paintLast();
 902                         rp.paintText();
 903                 }
 904                 y += rit->descent();
 905                 // Restore, see above
 906                 refreshInside = tmp;
 907         }
 908         lyxerr[Debug::PAINTING] << "." << endl;
 909 }
 910
 911 } // namespace anon
 912
 913
 914 void paintText(BufferView & bv, ViewMetricsInfo const & vi,
 915                Painter & pain)
 916 {
 917         LyXText & text = bv.buffer()->text();
 918         bool const select = bv.cursor().selection();
 919
 920         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 921         // Should the whole screen, including insets, be refreshed?
 922         bool repaintAll = select || !vi.singlepar;
 923
 924         if (repaintAll) {
 925                 // Clear background (if not delegated to rows)
 926                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 927                         text.backgroundColor());
 928         }
 929         if (select) {
 930                 text.drawSelection(pi, 0, 0);
 931         }
 932
 933         int yy = vi.y1;
 934         // draw contents
 935         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 936                 refreshInside = repaintAll;
 937                 Paragraph const & par = text.getPar(pit);
 938                 yy += par.ascent();
 939                 paintPar(pi, text, pit, 0, yy, repaintAll);
 940                 yy += par.descent();
 941         }
 942
 943         // Cache one paragraph above and one below
 944         // Note MV: this cannot be suppressed even for singlepar.
 945         // Try viewing the User Guide Mobius figure
 946
 947         if (vi.p1 > 0) {
 948                 text.redoParagraph(vi.p1 - 1);
 949                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 950                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 951         }
 952
 953         if (vi.p2 < lyx::pit_type(text.paragraphs().size()) - 1) {
 954                 text.redoParagraph(vi.p2 + 1);
 955                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 956                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 957         }
 958
 959         // and grey out above (should not happen later)
 960 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 961         if (vi.y1 > 0 && !vi.singlepar)
 962                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 963
 964         // and possibly grey out below
 965 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 966         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 967                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 968 }
 969
 970
 971 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 972 {
 973 //      lyxerr << "  paintTextInset: y: " << y << endl;
 974
 975         y -= text.getPar(0).ascent();
 976         // This flag can not be set from within same inset:
 977         bool repaintAll = refreshInside;
 978         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 979                 y += text.getPar(pit).ascent();
 980                 paintPar(pi, text, pit, x, y, repaintAll);
 981                 y += text.getPar(pit).descent();
 982         }
 983 }