src/rowpainter.C

   1 /**
   2  * \file rowpainter.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author various
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "rowpainter.h"
  15
  16 #include "buffer.h"
  17 #include "coordcache.h"
  18 #include "cursor.h"
  19 #include "debug.h"
  20 #include "bufferparams.h"
  21 #include "BufferView.h"
  22 #include "encoding.h"
  23 #include "gettext.h"
  24 #include "language.h"
  25 #include "LColor.h"
  26 #include "lyxrc.h"
  27 #include "lyxrow.h"
  28 #include "lyxrow_funcs.h"
  29 #include "metricsinfo.h"
  30 #include "paragraph.h"
  31 #include "paragraph_funcs.h"
  32 #include "ParagraphParameters.h"
  33 #include "vspace.h"
  34
  35 #include "frontends/font_metrics.h"
  36 #include "frontends/nullpainter.h"
  37 #include "frontends/Painter.h"
  38
  39 #include "insets/insettext.h"
  40
  41 #include "support/textutils.h"
  42
  43 #include <boost/crc.hpp>
  44
  45 using lyx::frontend::Painter;
  46 using lyx::frontend::NullPainter;
  47 using lyx::char_type;
  48 using lyx::pos_type;
  49 using lyx::pit_type;
  50
  51 using std::endl;
  52 using std::max;
  53 using std::min;
  54 using std::string;
  55
  56
  57 namespace {
  58
  59 /**
  60  * A class used for painting an individual row of text.
  61  */
  62 class RowPainter {
  63 public:
  64         /// initialise and run painter
  65         RowPainter(PainterInfo & pi, LyXText const & text,
  66                 pit_type pit, Row const & row, int x, int y);
  67
  68         // paint various parts
  69         void paintAppendix();
  70         void paintDepthBar();
  71         void paintChangeBar();
  72         void paintFirst();
  73         void paintLast();
  74         void paintText();
  75
  76 private:
  77         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  78         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  79         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  80         void paintChars(lyx::pos_type & vpos, LyXFont font,
  81                         bool hebrew, bool arabic);
  82         int paintAppendixStart(int y);
  83         void paintFromPos(lyx::pos_type & vpos);
  84         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  85
  86         /// return left margin
  87         int leftMargin() const;
  88
  89         /// return the label font for this row
  90         LyXFont const getLabelFont() const;
  91
  92         /// bufferview to paint on
  93         BufferView const & bv_;
  94
  95         /// Painter to use
  96         Painter & pain_;
  97
  98         /// LyXText for the row
  99         LyXText const & text_;
 100         ParagraphList const & pars_;
 101
 102         /// The row to paint
 103         Row const & row_;
 104
 105         /// Row's paragraph
 106         pit_type const pit_;
 107         Paragraph const & par_;
 108
 109         /// is row erased? (change tracking)
 110         bool erased_;
 111
 112         // Looks ugly - is
 113         double const xo_;
 114         int const yo_;    // current baseline
 115         double x_;
 116         int width_;
 117         double separator_;
 118         double hfill_;
 119         double label_hfill_;
 120 };
 121
 122
 123 RowPainter::RowPainter(PainterInfo & pi,
 124         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 125         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 126           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 127           erased_(pi.erased_),
 128           xo_(x), yo_(y), width_(text_.width())
 129 {
 130         RowMetrics m = text_.computeRowMetrics(pit, row_);
 131         x_ = m.x + xo_;
 132
 133         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 134         //row_.dump();
 135
 136         separator_ = m.separator;
 137         hfill_ = m.hfill;
 138         label_hfill_ = m.label_hfill;
 139
 140         BOOST_ASSERT(pit >= 0);
 141         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 142 }
 143
 144
 145 LyXFont const RowPainter::getLabelFont() const
 146 {
 147         return text_.getLabelFont(par_);
 148 }
 149
 150
 151 int RowPainter::leftMargin() const
 152 {
 153         return text_.leftMargin(pit_, row_.pos());
 154 }
 155
 156
 157 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 158 {
 159         InsetBase const * inset = par_.getInset(pos);
 160         BOOST_ASSERT(inset);
 161         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 162         // FIXME: We should always use font, see documentation of
 163         // noFontChange() in insetbase.h.
 164         pi.base.font = inset->noFontChange() ?
 165                 bv_.buffer()->params().getFont() :
 166                 font;
 167         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 168         pi.erased_ = erased_ || isDeletedText(par_, pos);
 169         theCoords.insets().add(inset, int(x_), yo_);
 170         InsetText const * const in = inset->asTextInset();
 171         // non-wide insets are painted completely. Recursive
 172         bool tmp = bv_.repaintAll();
 173         if (!in || !in->Wide()) {
 174                 bv_.repaintAll(true);
 175                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 176         }
 177         if (bv_.repaintAll())
 178                 inset->drawSelection(pi, int(x_), yo_);
 179         inset->draw(pi, int(x_), yo_);
 180         bv_.repaintAll(tmp);
 181         x_ += inset->width();
 182 }
 183
 184
 185 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 186 {
 187         pos_type pos = text_.bidi.vis2log(vpos);
 188
 189         string str;
 190
 191         // first char
 192         char_type c = par_.getChar(pos);
 193         str += c;
 194         ++vpos;
 195
 196         int const width = font_metrics::width(c, font);
 197         int dx = 0;
 198
 199         for (pos_type i = pos - 1; i >= 0; --i) {
 200                 c = par_.getChar(i);
 201                 if (!Encodings::isComposeChar_hebrew(c)) {
 202                         if (isPrintableNonspace(c)) {
 203                                 int const width2 =
 204                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 205                                 // dalet / resh
 206                                 dx = (c == 'ø' || c == 'ã')
 207                                         ? width2 - width
 208                                         : (width2 - width) / 2;
 209                         }
 210                         break;
 211                 }
 212         }
 213
 214         // Draw nikud
 215         pain_.text(int(x_) + dx, yo_, str, font);
 216 }
 217
 218
 219 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 220 {
 221         pos_type pos = text_.bidi.vis2log(vpos);
 222         string str;
 223
 224         // first char
 225         char_type c = par_.getChar(pos);
 226         c = par_.transformChar(c, pos);
 227         str += c;
 228         ++vpos;
 229
 230         int const width = font_metrics::width(c, font);
 231         int dx = 0;
 232
 233         for (pos_type i = pos - 1; i >= 0; --i) {
 234                 c = par_.getChar(i);
 235                 if (!Encodings::isComposeChar_arabic(c)) {
 236                         if (isPrintableNonspace(c)) {
 237                                 int const width2 =
 238                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 239                                 dx = (width2 - width) / 2;
 240                         }
 241                         break;
 242                 }
 243         }
 244         // Draw nikud
 245         pain_.text(int(x_) + dx, yo_, str, font);
 246 }
 247
 248
 249 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 250                             bool hebrew, bool arabic)
 251 {
 252         pos_type pos = text_.bidi.vis2log(vpos);
 253         pos_type const end = row_.endpos();
 254         FontSpan const font_span = par_.fontSpan(pos);
 255         Change::Type const prev_change = par_.lookupChange(pos).type;
 256
 257         // first character
 258         string str;
 259         str += par_.getChar(pos);
 260         if (arabic) {
 261                 unsigned char c = str[0];
 262                 str[0] = par_.transformChar(c, pos);
 263         }
 264
 265         // collect as much similar chars as we can
 266         for (++vpos ; vpos < end ; ++vpos) {
 267                 pos = text_.bidi.vis2log(vpos);
 268                 if (pos < font_span.first || pos > font_span.last)
 269                         break;
 270
 271                 if (prev_change != par_.lookupChange(pos))
 272                         break;
 273
 274                 char_type c = par_.getChar(pos);
 275
 276                 if (!isPrintableNonspace(c))
 277                         break;
 278
 279                 if (arabic && Encodings::isComposeChar_arabic(c))
 280                         break;
 281
 282                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 283                         break;
 284
 285                 if (arabic)
 286                         c = par_.transformChar(c, pos);
 287
 288                 str += c;
 289         }
 290
 291         if (prev_change == Change::DELETED)
 292                 font.setColor(LColor::strikeout);
 293         else if (prev_change == Change::INSERTED)
 294                 font.setColor(LColor::newtext);
 295
 296         // Draw text and set the new x position
 297         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 298         pain_.text(int(x_), yo_, str, font);
 299         x_ += font_metrics::width(str, font);
 300 }
 301
 302
 303 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 304 {
 305         if (!lyxrc.mark_foreign_language)
 306                 return;
 307         if (font.language() == latex_language)
 308                 return;
 309         if (font.language() == bv_.buffer()->params().language)
 310                 return;
 311
 312         int const y = yo_ + 1 + desc;
 313         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 314 }
 315
 316
 317 void RowPainter::paintFromPos(pos_type & vpos)
 318 {
 319         pos_type const pos = text_.bidi.vis2log(vpos);
 320         LyXFont orig_font = text_.getFont(par_, pos);
 321
 322         double const orig_x = x_;
 323
 324         if (par_.isInset(pos)) {
 325                 paintInset(pos, orig_font);
 326                 ++vpos;
 327                 paintForeignMark(orig_x, orig_font,
 328                         par_.getInset(pos)->descent());
 329                 return;
 330         }
 331
 332         // usual characters, no insets
 333         char_type const c = par_.getChar(pos);
 334
 335         // special case languages
 336         std::string const & lang = orig_font.language()->lang();
 337         bool const hebrew = lang == "hebrew";
 338         bool const arabic = lang == "arabic" &&
 339                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 340                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 341
 342         // draw as many chars as we can
 343         if ((!hebrew && !arabic)
 344                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 345                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 346                 paintChars(vpos, orig_font, hebrew, arabic);
 347         } else if (hebrew) {
 348                 paintHebrewComposeChar(vpos, orig_font);
 349         } else if (arabic) {
 350                 paintArabicComposeChar(vpos, orig_font);
 351         }
 352
 353         paintForeignMark(orig_x, orig_font);
 354 }
 355
 356
 357 void RowPainter::paintChangeBar()
 358 {
 359         pos_type const start = row_.pos();
 360         pos_type const end = row_.endpos();
 361
 362         if (start == end || !par_.isChanged(start, end))
 363                 return;
 364
 365         int const height = text_.isLastRow(pit_, row_)
 366                 ? row_.ascent()
 367                 : row_.height();
 368
 369         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 370 }
 371
 372
 373 void RowPainter::paintAppendix()
 374 {
 375         if (!par_.params().appendix())
 376                 return;
 377
 378         int y = yo_ - row_.ascent();
 379
 380         if (par_.params().startOfAppendix())
 381                 y += 2 * defaultRowHeight();
 382
 383         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 384         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 385 }
 386
 387
 388 void RowPainter::paintDepthBar()
 389 {
 390         Paragraph::depth_type const depth = par_.getDepth();
 391
 392         if (depth <= 0)
 393                 return;
 394
 395         Paragraph::depth_type prev_depth = 0;
 396         if (!text_.isFirstRow(pit_, row_)) {
 397                 pit_type pit2 = pit_;
 398                 if (row_.pos() == 0)
 399                         --pit2;
 400                 prev_depth = pars_[pit2].getDepth();
 401         }
 402
 403         Paragraph::depth_type next_depth = 0;
 404         if (!text_.isLastRow(pit_, row_)) {
 405                 pit_type pit2 = pit_;
 406                 if (row_.endpos() >= pars_[pit2].size())
 407                         ++pit2;
 408                 next_depth = pars_[pit2].getDepth();
 409         }
 410
 411         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 412                 int const w = nestMargin() / 5;
 413                 int x = int(xo_) + w * i;
 414                 // only consider the changebar space if we're drawing outermost text
 415                 if (text_.isMainText())
 416                         x += changebarMargin();
 417
 418                 int const starty = yo_ - row_.ascent();
 419                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 420
 421                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 422
 423                 if (i > prev_depth)
 424                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 425                 if (i > next_depth)
 426                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 427         }
 428 }
 429
 430
 431 int RowPainter::paintAppendixStart(int y)
 432 {
 433         LyXFont pb_font;
 434         pb_font.setColor(LColor::appendix);
 435         pb_font.decSize();
 436
 437         string const label = _("Appendix");
 438         int w = 0;
 439         int a = 0;
 440         int d = 0;
 441         font_metrics::rectText(label, pb_font, w, a, d);
 442
 443         int const text_start = int(xo_ + (width_ - w) / 2);
 444         int const text_end = text_start + w;
 445
 446         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 447
 448         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 449         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 450
 451         return 3 * defaultRowHeight();
 452 }
 453
 454
 455 void RowPainter::paintFirst()
 456 {
 457         ParagraphParameters const & parparams = par_.params();
 458
 459         int y_top = 0;
 460
 461         // start of appendix?
 462         if (parparams.startOfAppendix())
 463                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 464
 465         Buffer const & buffer = *bv_.buffer();
 466
 467         LyXLayout_ptr const & layout = par_.layout();
 468
 469         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 470                 if (pit_ != 0) {
 471                         if (layout->latextype == LATEX_PARAGRAPH
 472                                 && !par_.getDepth()) {
 473                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 474                         } else {
 475                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 476                                 if (playout->latextype == LATEX_PARAGRAPH
 477                                         && !pars_[pit_ - 1].getDepth()) {
 478                                         // is it right to use defskip here, too? (AS)
 479                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 480                                 }
 481                         }
 482                 }
 483         }
 484
 485         bool const is_rtl = text_.isRTL(par_);
 486         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 487         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 488
 489         // should we print a label?
 490         if (layout->labeltype >= LABEL_STATIC
 491             && (layout->labeltype != LABEL_STATIC
 492                       || layout->latextype != LATEX_ENVIRONMENT
 493                       || is_seq)) {
 494
 495                 LyXFont const font = getLabelFont();
 496                 string const str = par_.getLabelstring();
 497                 if (!str.empty()) {
 498                         double x = x_;
 499
 500                         // this is special code for the chapter layout. This is
 501                         // printed in an extra row and has a pagebreak at
 502                         // the top.
 503                         if (layout->counter == "chapter") {
 504                                 double spacing_val = 1.0;
 505                                 if (!parparams.spacing().isDefault()) {
 506                                         spacing_val = parparams.spacing().getValue();
 507                                 } else {
 508                                         spacing_val = buffer.params().spacing().getValue();
 509                                 }
 510
 511                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 512
 513                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 514                                         + int(layout->parsep) * defaultRowHeight();
 515
 516                                 if (is_rtl) {
 517                                         x = width_ - leftMargin() -
 518                                                 font_metrics::width(str, font);
 519                                 }
 520
 521                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 522                         } else {
 523                                 if (is_rtl) {
 524                                         x = width_ - leftMargin()
 525                                                 + font_metrics::width(layout->labelsep, font);
 526                                 } else {
 527                                         x = x_ - font_metrics::width(layout->labelsep, font)
 528                                                 - font_metrics::width(str, font);
 529                                 }
 530
 531                                 pain_.text(int(x), yo_, str, font);
 532                         }
 533                 }
 534
 535         // the labels at the top of an environment.
 536         // More or less for bibliography
 537         } else if (is_seq &&
 538                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 539                 layout->labeltype == LABEL_BIBLIO ||
 540                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 541                 LyXFont font = getLabelFont();
 542                 if (!par_.getLabelstring().empty()) {
 543                         string const str = par_.getLabelstring();
 544                         double spacing_val = 1.0;
 545                         if (!parparams.spacing().isDefault())
 546                                 spacing_val = parparams.spacing().getValue();
 547                         else
 548                                 spacing_val = buffer.params().spacing().getValue();
 549
 550                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 551
 552                         int maxdesc =
 553                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 554                                 + (layout->labelbottomsep * defaultRowHeight()));
 555
 556                         double x = x_;
 557                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 558                                 if (is_rtl)
 559                                         x = leftMargin();
 560                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 561                                 x -= font_metrics::width(str, font) / 2;
 562                         } else if (is_rtl) {
 563                                 x = width_ - leftMargin() -
 564                                         font_metrics::width(str, font);
 565                         }
 566                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 567                 }
 568         }
 569 }
 570
 571
 572 void RowPainter::paintLast()
 573 {
 574         bool const is_rtl = text_.isRTL(par_);
 575         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 576
 577         // draw an endlabel
 578         switch (endlabel) {
 579         case END_LABEL_BOX:
 580         case END_LABEL_FILLED_BOX: {
 581                 LyXFont const font = getLabelFont();
 582                 int const size = int(0.75 * font_metrics::maxAscent(font));
 583                 int const y = yo_ - size;
 584                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 585
 586                 if (width_ - int(row_.width()) <= size)
 587                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 588
 589                 if (endlabel == END_LABEL_BOX)
 590                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 591                 else
 592                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 593                 break;
 594         }
 595
 596         case END_LABEL_STATIC: {
 597                 LyXFont font = getLabelFont();
 598                 string const & str = par_.layout()->endlabelstring();
 599                 double const x = is_rtl ?
 600                         x_ - font_metrics::width(str, font)
 601                         : - text_.rightMargin(par_) - row_.width();
 602                 pain_.text(int(x), yo_, str, font);
 603                 break;
 604         }
 605
 606         case END_LABEL_NO_LABEL:
 607                 break;
 608         }
 609 }
 610
 611
 612 void RowPainter::paintText()
 613 {
 614         pos_type const end = row_.endpos();
 615         pos_type body_pos = par_.beginOfBody();
 616         if (body_pos > 0 &&
 617                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 618                 body_pos = 0;
 619         }
 620
 621         LyXLayout_ptr const & layout = par_.layout();
 622
 623         bool running_strikeout = false;
 624         bool is_struckout = false;
 625         int last_strikeout_x = 0;
 626
 627         // Use font span to speed things up, see below
 628         FontSpan font_span;
 629         LyXFont font;
 630
 631         for (pos_type vpos = row_.pos(); vpos < end; ) {
 632                 if (x_ > bv_.workWidth())
 633                         break;
 634
 635                 pos_type const pos = text_.bidi.vis2log(vpos);
 636
 637                 if (pos >= par_.size()) {
 638                         ++vpos;
 639                         continue;
 640                 }
 641
 642                 // Use font span to speed things up, see above
 643                 if (vpos < font_span.first || vpos > font_span.last) {
 644                         font_span = par_.fontSpan(vpos);
 645                         font = text_.getFont(par_, vpos);
 646                 }
 647
 648                 const int width_pos =
 649                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 650
 651                 if (x_ + width_pos < 0) {
 652                         x_ += width_pos;
 653                         ++vpos;
 654                         continue;
 655                 }
 656
 657                 is_struckout = isDeletedText(par_, pos);
 658
 659                 if (is_struckout && !running_strikeout) {
 660                         running_strikeout = true;
 661                         last_strikeout_x = int(x_);
 662                 }
 663
 664                 bool const highly_editable_inset = par_.isInset(pos)
 665                         && isHighlyEditableInset(par_.getInset(pos));
 666
 667                 // If we reach the end of a struck out range, paint it.
 668                 // We also don't paint across things like tables
 669                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 670                         // Calculate 1/3 height of the buffer's default font
 671                         int const middle =
 672                                 yo_ -
 673                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 674                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 675                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 676                         running_strikeout = false;
 677                 }
 678
 679                 if (body_pos > 0 && pos == body_pos - 1) {
 680                         int const lwidth = font_metrics::width(layout->labelsep,
 681                                 getLabelFont());
 682
 683                         x_ += label_hfill_ + lwidth - width_pos;
 684                 }
 685
 686                 if (par_.isHfill(pos)) {
 687                         x_ += 1;
 688
 689                         int const y0 = yo_;
 690                         int const y1 = y0 - defaultRowHeight() / 2;
 691
 692                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 693
 694                         if (hfillExpansion(par_, row_, pos)) {
 695                                 int const y2 = (y0 + y1) / 2;
 696
 697                                 if (pos >= body_pos) {
 698                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 699                                                   LColor::added_space,
 700                                                   Painter::line_onoffdash);
 701                                         x_ += hfill_;
 702                                 } else {
 703                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 704                                                   LColor::added_space,
 705                                                   Painter::line_onoffdash);
 706                                         x_ += label_hfill_;
 707                                 }
 708                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 709                         }
 710                         x_ += 2;
 711                         ++vpos;
 712                 } else if (par_.isSeparator(pos)) {
 713                         x_ += width_pos;
 714                         if (pos >= body_pos)
 715                                 x_ += separator_;
 716                         ++vpos;
 717                 } else {
 718                         paintFromPos(vpos);
 719                 }
 720         }
 721
 722         // if we reach the end of a struck out range, paint it
 723         if (running_strikeout) {
 724                 // calculate 1/3 height of the buffer's default font
 725                 int const middle =
 726                         yo_ -
 727                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 728                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 729                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 730                 running_strikeout = false;
 731         }
 732 }
 733
 734
 735 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 736         int x, int y)
 737 {
 738         boost::crc_32_type crc;
 739         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 740                 const unsigned char b[] = { par.getChar(i) };
 741                 crc.process_bytes(b, 1);
 742         }
 743         const unsigned char b[] = { x, y, row.width() };
 744         crc.process_bytes(b, 3);
 745         return crc.checksum();
 746 }
 747
 748
 749 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 750         RowList::const_iterator rit, LyXText const & text)
 751 {
 752         // Is there a cursor on this row (or inside inset on row)
 753         LCursor & cur = pi.base.bv->cursor();
 754         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 755                 CursorSlice const & sl = cur[d];
 756                 if (sl.text() == &text
 757                     && sl.pit() == pit
 758                     && sl.pos() >= rit->pos()
 759                     && sl.pos() <= rit->endpos())
 760                         return true;
 761         }
 762         return false;
 763 }
 764
 765
 766 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 767         RowList::const_iterator rit, LyXText const & text)
 768 {
 769         // Is there a cursor inside an inset on this row, and is this inset
 770         // the only "character" on this row
 771         LCursor & cur = pi.base.bv->cursor();
 772         if (rit->pos() + 1 != rit->endpos())
 773                 return false;
 774         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 775                 CursorSlice const & sl = cur[d];
 776                 if (sl.text() == &text
 777                     && sl.pit() == pit
 778                     && sl.pos() == rit->pos())
 779                         return d < cur.depth() - 1;
 780         }
 781         return false;
 782 }
 783
 784
 785 void paintPar
 786         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 787          bool repaintAll)
 788 {
 789 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 790         static NullPainter nop;
 791         static PainterInfo nullpi(pi.base.bv, nop);
 792         int const ww = pi.base.bv->workHeight();
 793
 794         Paragraph const & par = text.paragraphs()[pit];
 795
 796         RowList::const_iterator const rb = par.rows().begin();
 797         RowList::const_iterator const re = par.rows().end();
 798         theCoords.parPos()[&text][pit] = Point(x, y);
 799
 800         y -= rb->ascent();
 801         lyx::size_type rowno(0);
 802         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 803                 y += rit->ascent();
 804                 // Allow setting of bv->repaintAll() for nested insets in
 805                 // this row only
 806                 bool tmp = pi.base.bv->repaintAll();
 807
 808                 // Row signature; has row changed since last paint?
 809                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 810                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 811
 812                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 813                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 814                         text);
 815
 816                 // If this is the only object on the row, we can make it wide
 817                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 818                         InsetBase const * const in = par.getInset(i);
 819                         if (in) {
 820                                 InsetText const * const t = in->asTextInset();
 821                                 if (t)
 822                                         t->Wide() = in_inset_alone_on_row;
 823                         }
 824                 }
 825
 826                 // If selection is on, the current row signature differs
 827                 // from cache, or cursor is inside an inset _on this row_,
 828                 // then paint the row
 829                 if (repaintAll || row_has_changed || cursor_on_row) {
 830                         // Add to row signature cache
 831                         par.rowSignature()[rowno] = row_sig;
 832
 833                         bool const inside = (y + rit->descent() >= 0
 834                                        && y - rit->ascent() < ww);
 835                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 836                         // Clear background of this row
 837                         // (if paragraph background was not cleared)
 838                         if (!repaintAll &&
 839                             (!in_inset_alone_on_row || row_has_changed)) {
 840                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 841                                     text.maxwidth_, rit->height(),
 842                                     text.backgroundColor());
 843                                 // If outer row has changed, force nested
 844                                 // insets to repaint completely
 845                                 if (row_has_changed)
 846                                         pi.base.bv->repaintAll(true);
 847                         }
 848
 849                         // Instrumentation for testing row cache (see also
 850                         // 12 lines lower):
 851                         if (text.isMainText())
 852                                 lyxerr[Debug::PAINTING] << "#";
 853                         else
 854                                 lyxerr[Debug::PAINTING] << "[" <<
 855                                     repaintAll << row_has_changed <<
 856                                     cursor_on_row << "]";
 857                         rp.paintAppendix();
 858                         rp.paintDepthBar();
 859                         rp.paintChangeBar();
 860                         if (rit == rb)
 861                                 rp.paintFirst();
 862                         if (rit + 1 == re)
 863                                 rp.paintLast();
 864                         rp.paintText();
 865                 }
 866                 y += rit->descent();
 867                 // Restore, see above
 868                 pi.base.bv->repaintAll(tmp);
 869         }
 870         lyxerr[Debug::PAINTING] << "." << endl;
 871 }
 872
 873 } // namespace anon
 874
 875
 876 void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 877 {
 878         Painter & pain = bv.painter();
 879         LyXText * const text = bv.text();
 880         bool const select = bv.cursor().selection();
 881
 882         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 883         // Should the whole screen, including insets, be refreshed?
 884         bool repaintAll(select || !vi.singlepar);
 885
 886         if (repaintAll) {
 887                 // Clear background (if not delegated to rows)
 888                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 889                         text->backgroundColor());
 890         }
 891         if (select) {
 892                 text->drawSelection(pi, 0, 0);
 893         }
 894
 895         int yy = vi.y1;
 896         // draw contents
 897         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 898                 bv.repaintAll(repaintAll);
 899                 Paragraph const & par = text->getPar(pit);
 900                 yy += par.ascent();
 901                 paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
 902                 yy += par.descent();
 903         }
 904
 905         // Cache one paragraph above and one below
 906         // Note MV: this cannot be suppressed even for singlepar.
 907         // Try viewing the User Guide Mobius figure
 908
 909         if (vi.p1 > 0) {
 910                 text->redoParagraph(vi.p1 - 1);
 911                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 912                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 913         }
 914
 915         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 916                 text->redoParagraph(vi.p2 + 1);
 917                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 918                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 919         }
 920
 921         // and grey out above (should not happen later)
 922 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 923         if (vi.y1 > 0 && !vi.singlepar)
 924                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 925
 926         // and possibly grey out below
 927 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 928         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 929                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 930 }
 931
 932
 933 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 934 {
 935 //      lyxerr << "  paintTextInset: y: " << y << endl;
 936
 937         y -= text.getPar(0).ascent();
 938         // This flag can not be set from within same inset:
 939         bool repaintAll = pi.base.bv->repaintAll();
 940         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 941                 y += text.getPar(pit).ascent();
 942                 paintPar(pi, text, pit, x, y, repaintAll);
 943                 y += text.getPar(pit).descent();
 944         }
 945 }