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 "metricsinfo.h"
  29 #include "paragraph.h"
  30 #include "paragraph_funcs.h"
  31 #include "ParagraphParameters.h"
  32 #include "vspace.h"
  33
  34 #include "frontends/FontMetrics.h"
  35 #include "frontends/nullpainter.h"
  36 #include "frontends/Painter.h"
  37
  38 #include "insets/insettext.h"
  39
  40 #include "support/textutils.h"
  41
  42 #include <boost/crc.hpp>
  43
  44
  45 namespace lyx {
  46
  47 using frontend::Painter;
  48 using frontend::NullPainter;
  49 using frontend::FontMetrics;
  50
  51 using std::endl;
  52 using std::max;
  53 using std::min;
  54 using std::string;
  55
  56
  57 namespace {
  58
  59 /// Flag: do a full redraw of inside text of inset
  60 /// Working variable indicating a full screen refresh
  61 bool refreshInside;
  62
  63 /**
  64  * A class used for painting an individual row of text.
  65  */
  66 class RowPainter {
  67 public:
  68         /// initialise and run painter
  69         RowPainter(PainterInfo & pi, LyXText const & text,
  70                 pit_type pit, Row const & row, int x, int y);
  71
  72         // paint various parts
  73         void paintAppendix();
  74         void paintDepthBar();
  75         void paintChangeBar();
  76         void paintFirst();
  77         void paintLast();
  78         void paintText();
  79
  80 private:
  81         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  82         void paintHebrewComposeChar(pos_type & vpos, LyXFont const & font);
  83         void paintArabicComposeChar(pos_type & vpos, LyXFont const & font);
  84         void paintChars(pos_type & vpos, LyXFont font,
  85                         bool hebrew, bool arabic);
  86         int paintAppendixStart(int y);
  87         void paintFromPos(pos_type & vpos);
  88         void paintInset(pos_type const pos, LyXFont const & font);
  89
  90         /// return left margin
  91         int leftMargin() const;
  92
  93         /// return the label font for this row
  94         LyXFont const getLabelFont() const;
  95
  96         /// bufferview to paint on
  97         BufferView & bv_;
  98
  99         /// Painter to use
 100         Painter & pain_;
 101
 102         /// LyXText for the row
 103         LyXText const & text_;
 104         ParagraphList const & pars_;
 105
 106         /// The row to paint
 107         Row const & row_;
 108
 109         /// Row's paragraph
 110         pit_type const pit_;
 111         Paragraph const & par_;
 112
 113         /// is row erased? (change tracking)
 114         bool erased_;
 115
 116         // Looks ugly - is
 117         double const xo_;
 118         int const yo_;    // current baseline
 119         double x_;
 120         int width_;
 121         double separator_;
 122         double hfill_;
 123         double label_hfill_;
 124 };
 125
 126
 127 RowPainter::RowPainter(PainterInfo & pi,
 128         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 129         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 130           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 131           erased_(pi.erased_),
 132           xo_(x), yo_(y), width_(text_.width())
 133 {
 134         RowMetrics m = text_.computeRowMetrics(pit, row_);
 135         x_ = m.x + xo_;
 136
 137         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 138         //row_.dump();
 139
 140         separator_ = m.separator;
 141         hfill_ = m.hfill;
 142         label_hfill_ = m.label_hfill;
 143
 144         BOOST_ASSERT(pit >= 0);
 145         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 146 }
 147
 148
 149 LyXFont const RowPainter::getLabelFont() const
 150 {
 151         return text_.getLabelFont(par_);
 152 }
 153
 154
 155 int RowPainter::leftMargin() const
 156 {
 157         return text_.leftMargin(pit_, row_.pos());
 158 }
 159
 160
 161 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 162 {
 163         InsetBase const * inset = par_.getInset(pos);
 164         BOOST_ASSERT(inset);
 165         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 166         // FIXME: We should always use font, see documentation of
 167         // noFontChange() in insetbase.h.
 168         pi.base.font = inset->noFontChange() ?
 169                 bv_.buffer()->params().getFont() :
 170                 font;
 171         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 172         pi.erased_ = erased_ || par_.isDeleted(pos);
 173         bv_.coordCache().insets().add(inset, int(x_), yo_);
 174         InsetText const * const in = inset->asTextInset();
 175         // non-wide insets are painted completely. Recursive
 176         bool tmp = refreshInside;
 177         if (!in || !in->Wide()) {
 178                 refreshInside = true;
 179                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 180         }
 181         if (refreshInside)
 182                 inset->drawSelection(pi, int(x_), yo_);
 183         inset->draw(pi, int(x_), yo_);
 184         refreshInside = tmp;
 185         x_ += inset->width();
 186 }
 187
 188
 189 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 190 {
 191         pos_type pos = text_.bidi.vis2log(vpos);
 192
 193         docstring str;
 194
 195         // first char
 196         char_type c = par_.getChar(pos);
 197         str += c;
 198         ++vpos;
 199
 200         int const width = theFontMetrics(font).width(c);
 201         int dx = 0;
 202
 203         for (pos_type i = pos - 1; i >= 0; --i) {
 204                 c = par_.getChar(i);
 205                 if (!Encodings::isComposeChar_hebrew(c)) {
 206                         if (isPrintableNonspace(c)) {
 207                                 int const width2 =
 208                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 209                                 // FIXME UNICODE
 210                                 // This does not work anymore, and non-ascii
 211                                 // characters in source files are forbidden
 212                                 // anyway.
 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                 if (prev_change != par_.lookupChange(pos).type)
 286                         break;
 287
 288                 char_type c = par_.getChar(pos);
 289
 290                 if (!isPrintableNonspace(c))
 291                         break;
 292
 293                 if (arabic && Encodings::isComposeChar_arabic(c))
 294                         break;
 295
 296                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 297                         break;
 298
 299                 if (arabic)
 300                         c = par_.transformChar(c, pos);
 301
 302 #if 0
 303                 str += c;
 304 #else
 305                 str.push_back(c);
 306 #endif
 307         }
 308
 309         if (prev_change == Change::DELETED)
 310                 font.setColor(LColor::strikeout);
 311         else if (prev_change == Change::INSERTED)
 312                 font.setColor(LColor::newtext);
 313
 314         // Draw text and set the new x position
 315         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 316 #if 0
 317         int width = pain_.text(int(x_), yo_, str, font);
 318 #else
 319         int width = pain_.text(int(x_), yo_, &str[0], str.size(), font);
 320 #endif
 321         x_ += width;
 322 }
 323
 324
 325 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 326 {
 327         if (!lyxrc.mark_foreign_language)
 328                 return;
 329         if (font.language() == latex_language)
 330                 return;
 331         if (font.language() == bv_.buffer()->params().language)
 332                 return;
 333
 334         int const y = yo_ + 1 + desc;
 335         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 336 }
 337
 338
 339 void RowPainter::paintFromPos(pos_type & vpos)
 340 {
 341         pos_type const pos = text_.bidi.vis2log(vpos);
 342         LyXFont orig_font = text_.getFont(par_, pos);
 343
 344         double const orig_x = x_;
 345
 346         if (par_.isInset(pos)) {
 347                 paintInset(pos, orig_font);
 348                 ++vpos;
 349                 paintForeignMark(orig_x, orig_font,
 350                         par_.getInset(pos)->descent());
 351                 return;
 352         }
 353
 354         // usual characters, no insets
 355         char_type const c = par_.getChar(pos);
 356
 357         // special case languages
 358         std::string const & lang = orig_font.language()->lang();
 359         bool const hebrew = lang == "hebrew";
 360         bool const arabic = lang == "arabic" &&
 361                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 362                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 363
 364         // draw as many chars as we can
 365         if ((!hebrew && !arabic)
 366                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 367                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 368                 paintChars(vpos, orig_font, hebrew, arabic);
 369         } else if (hebrew) {
 370                 paintHebrewComposeChar(vpos, orig_font);
 371         } else if (arabic) {
 372                 paintArabicComposeChar(vpos, orig_font);
 373         }
 374
 375         paintForeignMark(orig_x, orig_font);
 376 }
 377
 378
 379 void RowPainter::paintChangeBar()
 380 {
 381         pos_type const start = row_.pos();
 382         pos_type const end = row_.endpos();
 383
 384         if (start == end || !par_.isChanged(start, end))
 385                 return;
 386
 387         int const height = text_.isLastRow(pit_, row_)
 388                 ? row_.ascent()
 389                 : row_.height();
 390
 391         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 392 }
 393
 394
 395 void RowPainter::paintAppendix()
 396 {
 397         if (!par_.params().appendix())
 398                 return;
 399
 400         int y = yo_ - row_.ascent();
 401
 402         if (par_.params().startOfAppendix())
 403                 y += 2 * defaultRowHeight();
 404
 405         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 406         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 407 }
 408
 409
 410 void RowPainter::paintDepthBar()
 411 {
 412         depth_type const depth = par_.getDepth();
 413
 414         if (depth <= 0)
 415                 return;
 416
 417         depth_type prev_depth = 0;
 418         if (!text_.isFirstRow(pit_, row_)) {
 419                 pit_type pit2 = pit_;
 420                 if (row_.pos() == 0)
 421                         --pit2;
 422                 prev_depth = pars_[pit2].getDepth();
 423         }
 424
 425         depth_type next_depth = 0;
 426         if (!text_.isLastRow(pit_, row_)) {
 427                 pit_type pit2 = pit_;
 428                 if (row_.endpos() >= pars_[pit2].size())
 429                         ++pit2;
 430                 next_depth = pars_[pit2].getDepth();
 431         }
 432
 433         for (depth_type i = 1; i <= depth; ++i) {
 434                 int const w = nestMargin() / 5;
 435                 int x = int(xo_) + w * i;
 436                 // only consider the changebar space if we're drawing outermost text
 437                 if (text_.isMainText())
 438                         x += changebarMargin();
 439
 440                 int const starty = yo_ - row_.ascent();
 441                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 442
 443                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 444
 445                 if (i > prev_depth)
 446                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 447                 if (i > next_depth)
 448                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 449         }
 450 }
 451
 452
 453 int RowPainter::paintAppendixStart(int y)
 454 {
 455         LyXFont pb_font;
 456         pb_font.setColor(LColor::appendix);
 457         pb_font.decSize();
 458
 459         int w = 0;
 460         int a = 0;
 461         int d = 0;
 462
 463         docstring const label = _("Appendix");
 464         theFontMetrics(pb_font).rectText(label, w, a, d);
 465
 466         int const text_start = int(xo_ + (width_ - w) / 2);
 467         int const text_end = text_start + w;
 468
 469         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 470
 471         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 472         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 473
 474         return 3 * defaultRowHeight();
 475 }
 476
 477
 478 void RowPainter::paintFirst()
 479 {
 480         ParagraphParameters const & parparams = par_.params();
 481
 482         int y_top = 0;
 483
 484         // start of appendix?
 485         if (parparams.startOfAppendix())
 486                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 487
 488         Buffer const & buffer = *bv_.buffer();
 489
 490         LyXLayout_ptr const & layout = par_.layout();
 491
 492         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 493                 if (pit_ != 0) {
 494                         if (layout->latextype == LATEX_PARAGRAPH
 495                                 && !par_.getDepth()) {
 496                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 497                         } else {
 498                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 499                                 if (playout->latextype == LATEX_PARAGRAPH
 500                                         && !pars_[pit_ - 1].getDepth()) {
 501                                         // is it right to use defskip here, too? (AS)
 502                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 503                                 }
 504                         }
 505                 }
 506         }
 507
 508         bool const is_rtl = text_.isRTL(par_);
 509         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 510         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 511
 512         // should we print a label?
 513         if (layout->labeltype >= LABEL_STATIC
 514             && (layout->labeltype != LABEL_STATIC
 515                       || layout->latextype != LATEX_ENVIRONMENT
 516                       || is_seq)) {
 517
 518                 LyXFont const font = getLabelFont();
 519                 FontMetrics const & fm = theFontMetrics(font);
 520
 521                 docstring const str = par_.getLabelstring();
 522                 if (!str.empty()) {
 523                         double x = x_;
 524
 525                         // this is special code for the chapter layout. This is
 526                         // printed in an extra row and has a pagebreak at
 527                         // the top.
 528                         if (layout->counter == "chapter") {
 529                                 double spacing_val = 1.0;
 530                                 if (!parparams.spacing().isDefault()) {
 531                                         spacing_val = parparams.spacing().getValue();
 532                                 } else {
 533                                         spacing_val = buffer.params().spacing().getValue();
 534                                 }
 535
 536                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 537
 538                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 539                                         + int(layout->parsep) * defaultRowHeight();
 540
 541                                 if (is_rtl) {
 542                                         x = width_ - leftMargin() -
 543                                                 fm.width(str);
 544                                 }
 545
 546                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 547                         } else {
 548                                 // FIXME UNICODE
 549                                 docstring lab = from_utf8(layout->labelsep);
 550                                 if (is_rtl) {
 551                                         x = width_ - leftMargin()
 552                                                 + fm.width(lab);
 553                                 } else {
 554                                         x = x_ - fm.width(lab)
 555                                                 - fm.width(str);
 556                                 }
 557
 558                                 pain_.text(int(x), yo_, str, font);
 559                         }
 560                 }
 561
 562         // the labels at the top of an environment.
 563         // More or less for bibliography
 564         } else if (is_seq &&
 565                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 566                 layout->labeltype == LABEL_BIBLIO ||
 567                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 568                 LyXFont font = getLabelFont();
 569                 if (!par_.getLabelstring().empty()) {
 570                         docstring const str = par_.getLabelstring();
 571                         double spacing_val = 1.0;
 572                         if (!parparams.spacing().isDefault())
 573                                 spacing_val = parparams.spacing().getValue();
 574                         else
 575                                 spacing_val = buffer.params().spacing().getValue();
 576
 577                         FontMetrics const & fm = theFontMetrics(font);
 578
 579                         int const labeladdon = int(fm.maxHeight()
 580                                 * layout->spacing.getValue() * spacing_val);
 581
 582                         int maxdesc =
 583                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 584                                 + (layout->labelbottomsep * defaultRowHeight()));
 585
 586                         double x = x_;
 587                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 588                                 if (is_rtl)
 589                                         x = leftMargin();
 590                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 591                                 x -= fm.width(str) / 2;
 592                         } else if (is_rtl) {
 593                                 x = width_ - leftMargin() -     fm.width(str);
 594                         }
 595                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 596                 }
 597         }
 598 }
 599
 600
 601 void RowPainter::paintLast()
 602 {
 603         bool const is_rtl = text_.isRTL(par_);
 604         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 605
 606         // draw an endlabel
 607         switch (endlabel) {
 608         case END_LABEL_BOX:
 609         case END_LABEL_FILLED_BOX: {
 610                 LyXFont const font = getLabelFont();
 611                 FontMetrics const & fm = theFontMetrics(font);
 612                 int const size = int(0.75 * fm.maxAscent());
 613                 int const y = yo_ - size;
 614                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 615
 616                 if (width_ - int(row_.width()) <= size)
 617                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 618
 619                 if (endlabel == END_LABEL_BOX)
 620                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 621                 else
 622                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 623                 break;
 624         }
 625
 626         case END_LABEL_STATIC: {
 627                 LyXFont font = getLabelFont();
 628                 FontMetrics const & fm = theFontMetrics(font);
 629                 docstring const & str = par_.layout()->endlabelstring();
 630                 double const x = is_rtl ?
 631                         x_ - fm.width(str)
 632                         : - text_.rightMargin(par_) - row_.width();
 633                 pain_.text(int(x), yo_, str, font);
 634                 break;
 635         }
 636
 637         case END_LABEL_NO_LABEL:
 638                 break;
 639         }
 640 }
 641
 642
 643 void RowPainter::paintText()
 644 {
 645         pos_type const end = row_.endpos();
 646         pos_type body_pos = par_.beginOfBody();
 647         if (body_pos > 0 &&
 648                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 649                 body_pos = 0;
 650         }
 651
 652         LyXLayout_ptr const & layout = par_.layout();
 653
 654         bool running_strikeout = false;
 655         bool is_struckout = false;
 656         int last_strikeout_x = 0;
 657
 658         // Use font span to speed things up, see below
 659         FontSpan font_span;
 660         LyXFont font;
 661
 662         for (pos_type vpos = row_.pos(); vpos < end; ) {
 663                 if (x_ > bv_.workWidth())
 664                         break;
 665
 666                 pos_type const pos = text_.bidi.vis2log(vpos);
 667
 668                 if (pos >= par_.size()) {
 669                         ++vpos;
 670                         continue;
 671                 }
 672
 673                 // Use font span to speed things up, see above
 674                 if (vpos < font_span.first || vpos > font_span.last) {
 675                         font_span = par_.fontSpan(vpos);
 676                         font = text_.getFont(par_, vpos);
 677                 }
 678
 679                 const int width_pos =
 680                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 681
 682                 if (x_ + width_pos < 0) {
 683                         x_ += width_pos;
 684                         ++vpos;
 685                         continue;
 686                 }
 687
 688                 is_struckout = par_.isDeleted(pos);
 689
 690                 if (is_struckout && !running_strikeout) {
 691                         running_strikeout = true;
 692                         last_strikeout_x = int(x_);
 693                 }
 694
 695                 bool const highly_editable_inset = par_.isInset(pos)
 696                         && isHighlyEditableInset(par_.getInset(pos));
 697
 698                 // If we reach the end of a struck out range, paint it.
 699                 // We also don't paint across things like tables
 700                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 701                         // Calculate 1/3 height of the buffer's default font
 702                         FontMetrics const & fm
 703                                 = theFontMetrics(bv_.buffer()->params().getFont());
 704                         int const middle = yo_ - fm.maxAscent() / 3;
 705                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 706                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 707                         running_strikeout = false;
 708                 }
 709
 710                 if (body_pos > 0 && pos == body_pos - 1) {
 711                         // FIXME UNICODE
 712                         int const lwidth = theFontMetrics(getLabelFont())
 713                                 .width(from_utf8(layout->labelsep));
 714
 715                         x_ += label_hfill_ + lwidth - width_pos;
 716                 }
 717
 718                 if (par_.isHfill(pos)) {
 719                         x_ += 1;
 720
 721                         int const y0 = yo_;
 722                         int const y1 = y0 - defaultRowHeight() / 2;
 723
 724                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 725
 726                         if (par_.hfillExpansion(row_, pos)) {
 727                                 int const y2 = (y0 + y1) / 2;
 728
 729                                 if (pos >= body_pos) {
 730                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 731                                                   LColor::added_space,
 732                                                   Painter::line_onoffdash);
 733                                         x_ += hfill_;
 734                                 } else {
 735                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 736                                                   LColor::added_space,
 737                                                   Painter::line_onoffdash);
 738                                         x_ += label_hfill_;
 739                                 }
 740                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 741                         }
 742                         x_ += 2;
 743                         ++vpos;
 744                 } else if (par_.isSeparator(pos)) {
 745                         x_ += width_pos;
 746                         if (pos >= body_pos)
 747                                 x_ += separator_;
 748                         ++vpos;
 749                 } else {
 750                         paintFromPos(vpos);
 751                 }
 752         }
 753
 754         // if we reach the end of a struck out range, paint it
 755         if (running_strikeout) {
 756                 // calculate 1/3 height of the buffer's default font
 757                 FontMetrics const & fm
 758                         = theFontMetrics(bv_.buffer()->params().getFont());
 759                 int const middle = yo_ - fm.maxAscent() / 3;
 760                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 761                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 762                 running_strikeout = false;
 763         }
 764 }
 765
 766
 767 size_type calculateRowSignature(Row const & row, Paragraph const & par,
 768         int x, int y)
 769 {
 770         boost::crc_32_type crc;
 771         for (pos_type i = row.pos(); i < row.endpos(); ++i) {
 772                 const unsigned char b[] = { par.getChar(i) };
 773                 crc.process_bytes(b, 1);
 774         }
 775         const unsigned char b[] = { x, y, row.width() };
 776         crc.process_bytes(b, 3);
 777         return crc.checksum();
 778 }
 779
 780
 781 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 782         RowList::const_iterator rit, LyXText const & text)
 783 {
 784         // Is there a cursor on this row (or inside inset on row)
 785         LCursor & cur = pi.base.bv->cursor();
 786         for (size_type d = 0; d < cur.depth(); ++d) {
 787                 CursorSlice const & sl = cur[d];
 788                 if (sl.text() == &text
 789                     && sl.pit() == pit
 790                     && sl.pos() >= rit->pos()
 791                     && sl.pos() <= rit->endpos())
 792                         return true;
 793         }
 794         return false;
 795 }
 796
 797
 798 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 799         RowList::const_iterator rit, LyXText const & text)
 800 {
 801         // Is there a cursor inside an inset on this row, and is this inset
 802         // the only "character" on this row
 803         LCursor & cur = pi.base.bv->cursor();
 804         if (rit->pos() + 1 != rit->endpos())
 805                 return false;
 806         for (size_type d = 0; d < cur.depth(); d++) {
 807                 CursorSlice const & sl = cur[d];
 808                 if (sl.text() == &text
 809                     && sl.pit() == pit
 810                     && sl.pos() == rit->pos())
 811                         return d < cur.depth() - 1;
 812         }
 813         return false;
 814 }
 815
 816
 817 void paintPar
 818         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 819          bool repaintAll)
 820 {
 821 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 822         static NullPainter nop;
 823         static PainterInfo nullpi(pi.base.bv, nop);
 824         int const ww = pi.base.bv->workHeight();
 825
 826         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 827
 828         Paragraph const & par = text.paragraphs()[pit];
 829         if (par.rows().empty())
 830                 return;
 831
 832         RowList::const_iterator const rb = par.rows().begin();
 833         RowList::const_iterator const re = par.rows().end();
 834
 835         y -= rb->ascent();
 836         size_type rowno = 0;
 837         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 838                 y += rit->ascent();
 839                 // Allow setting of refreshInside for nested insets in
 840                 // this row only
 841                 bool tmp = refreshInside;
 842
 843                 // Row signature; has row changed since last paint?
 844                 size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 845                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 846
 847                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 848                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 849                         text);
 850
 851                 // If this is the only object on the row, we can make it wide
 852                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 853                         InsetBase const * const in = par.getInset(i);
 854                         if (in) {
 855                                 InsetText const * const t = in->asTextInset();
 856                                 if (t)
 857                                         t->Wide() = in_inset_alone_on_row;
 858                         }
 859                 }
 860
 861                 // If selection is on, the current row signature differs
 862                 // from cache, or cursor is inside an inset _on this row_,
 863                 // then paint the row
 864                 if (repaintAll || row_has_changed || cursor_on_row) {
 865                         // Add to row signature cache
 866                         par.rowSignature()[rowno] = row_sig;
 867
 868                         bool const inside = (y + rit->descent() >= 0
 869                                        && y - rit->ascent() < ww);
 870                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 871                         // Clear background of this row
 872                         // (if paragraph background was not cleared)
 873                         if (!repaintAll &&
 874                             (!in_inset_alone_on_row || row_has_changed)) {
 875                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 876                                     text.maxwidth_, rit->height(),
 877                                     text.backgroundColor());
 878                                 // If outer row has changed, force nested
 879                                 // insets to repaint completely
 880                                 if (row_has_changed)
 881                                         refreshInside = true;
 882                         }
 883
 884                         // Instrumentation for testing row cache (see also
 885                         // 12 lines lower):
 886                         if (text.isMainText())
 887                                 lyxerr[Debug::PAINTING] << "#";
 888                         else
 889                                 lyxerr[Debug::PAINTING] << "[" <<
 890                                     repaintAll << row_has_changed <<
 891                                     cursor_on_row << "]";
 892                         rp.paintAppendix();
 893                         rp.paintDepthBar();
 894                         rp.paintChangeBar();
 895                         if (rit == rb)
 896                                 rp.paintFirst();
 897                         if (rit + 1 == re)
 898                                 rp.paintLast();
 899                         rp.paintText();
 900                 }
 901                 y += rit->descent();
 902                 // Restore, see above
 903                 refreshInside = tmp;
 904         }
 905         lyxerr[Debug::PAINTING] << "." << endl;
 906 }
 907
 908 } // namespace anon
 909
 910
 911 void paintText(BufferView & bv, ViewMetricsInfo const & vi,
 912                Painter & pain)
 913 {
 914         LyXText & text = bv.buffer()->text();
 915         bool const select = bv.cursor().selection();
 916
 917         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 918         // Should the whole screen, including insets, be refreshed?
 919         bool repaintAll = select || !vi.singlepar;
 920
 921         if (repaintAll) {
 922                 // Clear background (if not delegated to rows)
 923                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 924                         text.backgroundColor());
 925         }
 926         if (select) {
 927                 text.drawSelection(pi, 0, 0);
 928         }
 929
 930         int yy = vi.y1;
 931         // draw contents
 932         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 933                 refreshInside = repaintAll;
 934                 Paragraph const & par = text.getPar(pit);
 935                 yy += par.ascent();
 936                 paintPar(pi, text, pit, 0, yy, repaintAll);
 937                 yy += par.descent();
 938         }
 939
 940         // Cache one paragraph above and one below
 941         // Note MV: this cannot be suppressed even for singlepar.
 942         // Try viewing the User Guide Mobius figure
 943
 944         if (vi.p1 > 0) {
 945                 text.redoParagraph(vi.p1 - 1);
 946                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 947                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 948         }
 949
 950         if (vi.p2 < pit_type(text.paragraphs().size()) - 1) {
 951                 text.redoParagraph(vi.p2 + 1);
 952                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 953                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 954         }
 955
 956         // and grey out above (should not happen later)
 957 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 958         if (vi.y1 > 0 && !vi.singlepar)
 959                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 960
 961         // and possibly grey out below
 962 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 963         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 964                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 965 }
 966
 967
 968 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 969 {
 970 //      lyxerr << "  paintTextInset: y: " << y << endl;
 971
 972         y -= text.getPar(0).ascent();
 973         // This flag can not be set from within same inset:
 974         bool repaintAll = refreshInside;
 975         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 976                 y += text.getPar(pit).ascent();
 977                 paintPar(pi, text, pit, x, y, repaintAll);
 978                 y += text.getPar(pit).descent();
 979         }
 980 }
 981
 982
 983 } // namespace lyx