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/Painter.h"
  36
  37 #include "insets/insettext.h"
  38
  39 #include "support/textutils.h"
  40
  41 #include <boost/crc.hpp>
  42
  43
  44 namespace lyx {
  45
  46 using frontend::Painter;
  47 using frontend::FontMetrics;
  48
  49 using std::endl;
  50 using std::max;
  51 using std::min;
  52 using std::string;
  53
  54
  55 namespace {
  56
  57 /// Flag: do a full redraw of inside text of inset
  58 /// Working variable indicating a full screen refresh
  59 bool refreshInside;
  60
  61 /**
  62  * A class used for painting an individual row of text.
  63  */
  64 class RowPainter {
  65 public:
  66         /// initialise and run painter
  67         RowPainter(PainterInfo & pi, LyXText const & text,
  68                 pit_type pit, Row const & row, int x, int y);
  69
  70         // paint various parts
  71         void paintAppendix();
  72         void paintDepthBar();
  73         void paintChangeBar();
  74         void paintFirst();
  75         void paintLast();
  76         void paintText();
  77
  78 private:
  79         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  80         void paintHebrewComposeChar(pos_type & vpos, LyXFont const & font);
  81         void paintArabicComposeChar(pos_type & vpos, LyXFont const & font);
  82         void paintChars(pos_type & vpos, LyXFont const & font,
  83                         bool hebrew, bool arabic);
  84         int paintAppendixStart(int y);
  85         void paintFromPos(pos_type & vpos);
  86         void paintInset(pos_type const pos, LyXFont const & font);
  87
  88         /// return left margin
  89         int leftMargin() const;
  90
  91         /// return the label font for this row
  92         LyXFont const getLabelFont() const;
  93
  94         /// bufferview to paint on
  95         BufferView & bv_;
  96
  97         /// Painter to use
  98         Painter & pain_;
  99
 100         /// LyXText for the row
 101         LyXText const & text_;
 102         ParagraphList const & pars_;
 103
 104         /// The row to paint
 105         Row const & row_;
 106
 107         /// Row's paragraph
 108         pit_type const pit_;
 109         Paragraph const & par_;
 110
 111         /// is row erased? (change tracking)
 112         bool erased_;
 113
 114         // Looks ugly - is
 115         double const xo_;
 116         int const yo_;    // current baseline
 117         double x_;
 118         int width_;
 119         double separator_;
 120         double hfill_;
 121         double label_hfill_;
 122 };
 123
 124
 125 RowPainter::RowPainter(PainterInfo & pi,
 126         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 127         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 128           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 129           erased_(pi.erased_),
 130           xo_(x), yo_(y), width_(text_.width())
 131 {
 132         RowMetrics m = text_.computeRowMetrics(*bv_.buffer(), pit, row_);
 133         x_ = m.x + xo_;
 134
 135         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 136         //row_.dump();
 137
 138         separator_ = m.separator;
 139         hfill_ = m.hfill;
 140         label_hfill_ = m.label_hfill;
 141
 142         BOOST_ASSERT(pit >= 0);
 143         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 144 }
 145
 146
 147 LyXFont const RowPainter::getLabelFont() const
 148 {
 149         return text_.getLabelFont(*bv_.buffer(), par_);
 150 }
 151
 152
 153 int RowPainter::leftMargin() const
 154 {
 155         return text_.leftMargin(*bv_.buffer(), pit_, row_.pos());
 156 }
 157
 158
 159 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 160 {
 161         InsetBase const * inset = par_.getInset(pos);
 162         BOOST_ASSERT(inset);
 163         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 164         // FIXME: We should always use font, see documentation of
 165         // noFontChange() in insetbase.h.
 166         pi.base.font = inset->noFontChange() ?
 167                 bv_.buffer()->params().getFont() :
 168                 font;
 169         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 170         pi.erased_ = erased_ || par_.isDeleted(pos);
 171         bv_.coordCache().insets().add(inset, int(x_), yo_);
 172         InsetText const * const in = inset->asTextInset();
 173         // non-wide insets are painted completely. Recursive
 174         bool tmp = refreshInside;
 175         if (!in || !in->Wide()) {
 176                 refreshInside = true;
 177                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 178         }
 179         if (refreshInside)
 180                 inset->drawSelection(pi, int(x_), yo_);
 181         inset->draw(pi, int(x_), yo_);
 182         refreshInside = tmp;
 183         x_ += inset->width();
 184 }
 185
 186
 187 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 188 {
 189         pos_type pos = text_.bidi.vis2log(vpos);
 190
 191         docstring str;
 192
 193         // first char
 194         char_type c = par_.getChar(pos);
 195         str += c;
 196         ++vpos;
 197
 198         int const width = theFontMetrics(font).width(c);
 199         int dx = 0;
 200
 201         for (pos_type i = pos - 1; i >= 0; --i) {
 202                 c = par_.getChar(i);
 203                 if (!Encodings::isComposeChar_hebrew(c)) {
 204                         if (isPrintableNonspace(c)) {
 205                                 int const width2 = text_.singleWidth(par_, i, c,
 206                                         text_.getFont(*bv_.buffer(), par_, i));
 207                                 // FIXME UNICODE
 208                                 // This does not work anymore, and non-ascii
 209                                 // characters in source files are forbidden
 210                                 // anyway.
 211                                 // dalet / resh
 212                                 dx = (c == 'ø' || c == 'ã')
 213                                         ? width2 - width
 214                                         : (width2 - width) / 2;
 215                         }
 216                         break;
 217                 }
 218         }
 219
 220         // Draw nikud
 221         // FIXME UNICODE
 222         pain_.text(int(x_) + dx, yo_, str, font);
 223 }
 224
 225
 226 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 227 {
 228         pos_type pos = text_.bidi.vis2log(vpos);
 229         docstring str;
 230
 231         // first char
 232         char_type c = par_.getChar(pos);
 233         c = par_.transformChar(c, pos);
 234         str += c;
 235         ++vpos;
 236
 237         int const width = theFontMetrics(font).width(c);
 238         int dx = 0;
 239
 240         for (pos_type i = pos - 1; i >= 0; --i) {
 241                 c = par_.getChar(i);
 242                 if (!Encodings::isComposeChar_arabic(c)) {
 243                         if (isPrintableNonspace(c)) {
 244                                 int const width2 = text_.singleWidth(par_, i, c,
 245                                                 text_.getFont(*bv_.buffer(), par_, i));
 246                                 dx = (width2 - width) / 2;
 247                         }
 248                         break;
 249                 }
 250         }
 251         // Draw nikud
 252         pain_.text(int(x_) + dx, yo_, str, font);
 253 }
 254
 255 void RowPainter::paintChars(pos_type & vpos, LyXFont const & font,
 256                             bool hebrew, bool arabic)
 257 {
 258         // This method takes up 70% of time when typing
 259         pos_type pos = text_.bidi.vis2log(vpos);
 260         pos_type const end = row_.endpos();
 261         FontSpan const font_span = par_.fontSpan(pos);
 262         Change::Type const prev_change = par_.lookupChange(pos).type;
 263
 264         // first character
 265         std::vector<char_type> str;
 266         str.reserve(100);
 267         str.push_back(par_.getChar(pos));
 268
 269         if (arabic) {
 270                 char_type c = str[0];
 271                 str[0] = par_.transformChar(c, pos);
 272         }
 273
 274         // collect as much similar chars as we can
 275         for (++vpos ; vpos < end ; ++vpos) {
 276                 pos = text_.bidi.vis2log(vpos);
 277                 if (pos < font_span.first || pos > font_span.last)
 278                         break;
 279
 280                 if (prev_change != par_.lookupChange(pos).type)
 281                         break;
 282
 283                 char_type c = par_.getChar(pos);
 284
 285                 if (!isPrintableNonspace(c))
 286                         break;
 287
 288                 if (arabic && Encodings::isComposeChar_arabic(c))
 289                         break;
 290
 291                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 292                         break;
 293
 294                 if (arabic)
 295                         c = par_.transformChar(c, pos);
 296
 297                 str.push_back(c);
 298         }
 299
 300         if (prev_change != Change::UNCHANGED) {
 301                 LyXFont copy(font);
 302                 if (prev_change == Change::DELETED) {
 303                         copy.setColor(LColor::strikeout);
 304                 } else if (prev_change == Change::INSERTED) {
 305                         copy.setColor(LColor::newtext);
 306                 }
 307                 x_ += pain_.text(int(x_), yo_, &str[0], str.size(), copy);
 308         } else {
 309                 x_ += pain_.text(int(x_), yo_, &str[0], str.size(), font);
 310         }
 311 }
 312
 313
 314 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 315 {
 316         if (!lyxrc.mark_foreign_language)
 317                 return;
 318         if (font.language() == latex_language)
 319                 return;
 320         if (font.language() == bv_.buffer()->params().language)
 321                 return;
 322
 323         int const y = yo_ + 1 + desc;
 324         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 325 }
 326
 327
 328 void RowPainter::paintFromPos(pos_type & vpos)
 329 {
 330         pos_type const pos = text_.bidi.vis2log(vpos);
 331         LyXFont orig_font = text_.getFont(*bv_.buffer(), par_, pos);
 332
 333         double const orig_x = x_;
 334
 335         if (par_.isInset(pos)) {
 336                 paintInset(pos, orig_font);
 337                 ++vpos;
 338                 paintForeignMark(orig_x, orig_font,
 339                         par_.getInset(pos)->descent());
 340                 return;
 341         }
 342
 343         // usual characters, no insets
 344         char_type const c = par_.getChar(pos);
 345
 346         // special case languages
 347         std::string const & lang = orig_font.language()->lang();
 348         bool const hebrew = lang == "hebrew";
 349         bool const arabic = lang == "arabic" &&
 350                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 351                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 352
 353         // draw as many chars as we can
 354         if ((!hebrew && !arabic)
 355                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 356                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 357                 paintChars(vpos, orig_font, hebrew, arabic);
 358         } else if (hebrew) {
 359                 paintHebrewComposeChar(vpos, orig_font);
 360         } else if (arabic) {
 361                 paintArabicComposeChar(vpos, orig_font);
 362         }
 363
 364         paintForeignMark(orig_x, orig_font);
 365 }
 366
 367
 368 void RowPainter::paintChangeBar()
 369 {
 370         pos_type const start = row_.pos();
 371         pos_type const end = row_.endpos();
 372
 373         if (start == end || !par_.isChanged(start, end))
 374                 return;
 375
 376         int const height = text_.isLastRow(pit_, row_)
 377                 ? row_.ascent()
 378                 : row_.height();
 379
 380         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 381 }
 382
 383
 384 void RowPainter::paintAppendix()
 385 {
 386         if (!par_.params().appendix())
 387                 return;
 388
 389         int y = yo_ - row_.ascent();
 390
 391         if (par_.params().startOfAppendix())
 392                 y += 2 * defaultRowHeight();
 393
 394         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 395         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 396 }
 397
 398
 399 void RowPainter::paintDepthBar()
 400 {
 401         depth_type const depth = par_.getDepth();
 402
 403         if (depth <= 0)
 404                 return;
 405
 406         depth_type prev_depth = 0;
 407         if (!text_.isFirstRow(pit_, row_)) {
 408                 pit_type pit2 = pit_;
 409                 if (row_.pos() == 0)
 410                         --pit2;
 411                 prev_depth = pars_[pit2].getDepth();
 412         }
 413
 414         depth_type next_depth = 0;
 415         if (!text_.isLastRow(pit_, row_)) {
 416                 pit_type pit2 = pit_;
 417                 if (row_.endpos() >= pars_[pit2].size())
 418                         ++pit2;
 419                 next_depth = pars_[pit2].getDepth();
 420         }
 421
 422         for (depth_type i = 1; i <= depth; ++i) {
 423                 int const w = nestMargin() / 5;
 424                 int x = int(xo_) + w * i;
 425                 // only consider the changebar space if we're drawing outermost text
 426                 if (text_.isMainText(*bv_.buffer()))
 427                         x += changebarMargin();
 428
 429                 int const starty = yo_ - row_.ascent();
 430                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 431
 432                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 433
 434                 if (i > prev_depth)
 435                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 436                 if (i > next_depth)
 437                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 438         }
 439 }
 440
 441
 442 int RowPainter::paintAppendixStart(int y)
 443 {
 444         LyXFont pb_font;
 445         pb_font.setColor(LColor::appendix);
 446         pb_font.decSize();
 447
 448         int w = 0;
 449         int a = 0;
 450         int d = 0;
 451
 452         docstring const label = _("Appendix");
 453         theFontMetrics(pb_font).rectText(label, w, a, d);
 454
 455         int const text_start = int(xo_ + (width_ - w) / 2);
 456         int const text_end = text_start + w;
 457
 458         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 459
 460         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 461         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 462
 463         return 3 * defaultRowHeight();
 464 }
 465
 466
 467 void RowPainter::paintFirst()
 468 {
 469         ParagraphParameters const & parparams = par_.params();
 470
 471         int y_top = 0;
 472
 473         // start of appendix?
 474         if (parparams.startOfAppendix())
 475                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 476
 477         Buffer const & buffer = *bv_.buffer();
 478
 479         LyXLayout_ptr const & layout = par_.layout();
 480
 481         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 482                 if (pit_ != 0) {
 483                         if (layout->latextype == LATEX_PARAGRAPH
 484                                 && !par_.getDepth()) {
 485                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 486                         } else {
 487                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 488                                 if (playout->latextype == LATEX_PARAGRAPH
 489                                         && !pars_[pit_ - 1].getDepth()) {
 490                                         // is it right to use defskip here, too? (AS)
 491                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 492                                 }
 493                         }
 494                 }
 495         }
 496
 497         bool const is_rtl = text_.isRTL(buffer, par_);
 498         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 499         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 500
 501         // should we print a label?
 502         if (layout->labeltype >= LABEL_STATIC
 503             && (layout->labeltype != LABEL_STATIC
 504                       || layout->latextype != LATEX_ENVIRONMENT
 505                       || is_seq)) {
 506
 507                 LyXFont const font = getLabelFont();
 508                 FontMetrics const & fm = theFontMetrics(font);
 509
 510                 docstring const str = par_.getLabelstring();
 511                 if (!str.empty()) {
 512                         double x = x_;
 513
 514                         // this is special code for the chapter layout. This is
 515                         // printed in an extra row and has a pagebreak at
 516                         // the top.
 517                         if (layout->counter == "chapter") {
 518                                 double spacing_val = 1.0;
 519                                 if (!parparams.spacing().isDefault()) {
 520                                         spacing_val = parparams.spacing().getValue();
 521                                 } else {
 522                                         spacing_val = buffer.params().spacing().getValue();
 523                                 }
 524
 525                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 526
 527                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 528                                         + int(layout->parsep) * defaultRowHeight();
 529
 530                                 if (is_rtl) {
 531                                         x = width_ - leftMargin() -
 532                                                 fm.width(str);
 533                                 }
 534
 535                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 536                         } else {
 537                                 // FIXME UNICODE
 538                                 docstring lab = from_utf8(layout->labelsep);
 539                                 if (is_rtl) {
 540                                         x = width_ - leftMargin()
 541                                                 + fm.width(lab);
 542                                 } else {
 543                                         x = x_ - fm.width(lab)
 544                                                 - fm.width(str);
 545                                 }
 546
 547                                 pain_.text(int(x), yo_, str, font);
 548                         }
 549                 }
 550
 551         // the labels at the top of an environment.
 552         // More or less for bibliography
 553         } else if (is_seq &&
 554                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 555                 layout->labeltype == LABEL_BIBLIO ||
 556                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 557                 LyXFont font = getLabelFont();
 558                 if (!par_.getLabelstring().empty()) {
 559                         docstring const str = par_.getLabelstring();
 560                         double spacing_val = 1.0;
 561                         if (!parparams.spacing().isDefault())
 562                                 spacing_val = parparams.spacing().getValue();
 563                         else
 564                                 spacing_val = buffer.params().spacing().getValue();
 565
 566                         FontMetrics const & fm = theFontMetrics(font);
 567
 568                         int const labeladdon = int(fm.maxHeight()
 569                                 * layout->spacing.getValue() * spacing_val);
 570
 571                         int maxdesc =
 572                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 573                                 + (layout->labelbottomsep * defaultRowHeight()));
 574
 575                         double x = x_;
 576                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 577                                 if (is_rtl)
 578                                         x = leftMargin();
 579                                 x += (width_ - text_.rightMargin(buffer, par_) - leftMargin()) / 2;
 580                                 x -= fm.width(str) / 2;
 581                         } else if (is_rtl) {
 582                                 x = width_ - leftMargin() -     fm.width(str);
 583                         }
 584                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 585                 }
 586         }
 587 }
 588
 589
 590 void RowPainter::paintLast()
 591 {
 592         bool const is_rtl = text_.isRTL(*bv_.buffer(), par_);
 593         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 594
 595         // draw an endlabel
 596         switch (endlabel) {
 597         case END_LABEL_BOX:
 598         case END_LABEL_FILLED_BOX: {
 599                 LyXFont const font = getLabelFont();
 600                 FontMetrics const & fm = theFontMetrics(font);
 601                 int const size = int(0.75 * fm.maxAscent());
 602                 int const y = yo_ - size;
 603                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 604
 605                 if (width_ - int(row_.width()) <= size)
 606                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 607
 608                 if (endlabel == END_LABEL_BOX)
 609                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 610                 else
 611                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 612                 break;
 613         }
 614
 615         case END_LABEL_STATIC: {
 616                 LyXFont font = getLabelFont();
 617                 FontMetrics const & fm = theFontMetrics(font);
 618                 docstring const & str = par_.layout()->endlabelstring();
 619                 double const x = is_rtl ?
 620                         x_ - fm.width(str)
 621                         : - text_.rightMargin(*bv_.buffer(), par_) - row_.width();
 622                 pain_.text(int(x), yo_, str, font);
 623                 break;
 624         }
 625
 626         case END_LABEL_NO_LABEL:
 627                 break;
 628         }
 629 }
 630
 631
 632 void RowPainter::paintText()
 633 {
 634         pos_type const end = row_.endpos();
 635         pos_type body_pos = par_.beginOfBody();
 636         if (body_pos > 0 &&
 637                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 638                 body_pos = 0;
 639         }
 640
 641         LyXLayout_ptr const & layout = par_.layout();
 642
 643         bool running_strikeout = false;
 644         bool is_struckout = false;
 645         int last_strikeout_x = 0;
 646
 647         // Use font span to speed things up, see below
 648         FontSpan font_span;
 649         LyXFont font;
 650         Buffer const & buffer = *bv_.buffer();
 651
 652         for (pos_type vpos = row_.pos(); vpos < end; ) {
 653                 if (x_ > bv_.workWidth())
 654                         break;
 655
 656                 pos_type const pos = text_.bidi.vis2log(vpos);
 657
 658                 if (pos >= par_.size()) {
 659                         ++vpos;
 660                         continue;
 661                 }
 662
 663                 // Use font span to speed things up, see above
 664                 if (vpos < font_span.first || vpos > font_span.last) {
 665                         font_span = par_.fontSpan(vpos);
 666                         font = text_.getFont(buffer, par_, vpos);
 667                 }
 668
 669                 const int width_pos =
 670                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 671
 672                 if (x_ + width_pos < 0) {
 673                         x_ += width_pos;
 674                         ++vpos;
 675                         continue;
 676                 }
 677
 678                 is_struckout = par_.isDeleted(pos);
 679
 680                 if (is_struckout && !running_strikeout) {
 681                         running_strikeout = true;
 682                         last_strikeout_x = int(x_);
 683                 }
 684
 685                 bool const highly_editable_inset = par_.isInset(pos)
 686                         && isHighlyEditableInset(par_.getInset(pos));
 687
 688                 // If we reach the end of a struck out range, paint it.
 689                 // We also don't paint across things like tables
 690                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 691                         // Calculate 1/3 height of the buffer's default font
 692                         FontMetrics const & fm
 693                                 = theFontMetrics(bv_.buffer()->params().getFont());
 694                         int const middle = yo_ - fm.maxAscent() / 3;
 695                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 696                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 697                         running_strikeout = false;
 698                 }
 699
 700                 if (body_pos > 0 && pos == body_pos - 1) {
 701                         // FIXME UNICODE
 702                         int const lwidth = theFontMetrics(getLabelFont())
 703                                 .width(from_utf8(layout->labelsep));
 704
 705                         x_ += label_hfill_ + lwidth - width_pos;
 706                 }
 707
 708                 if (par_.isHfill(pos)) {
 709                         x_ += 1;
 710
 711                         int const y0 = yo_;
 712                         int const y1 = y0 - defaultRowHeight() / 2;
 713
 714                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 715
 716                         if (par_.hfillExpansion(row_, pos)) {
 717                                 int const y2 = (y0 + y1) / 2;
 718
 719                                 if (pos >= body_pos) {
 720                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 721                                                   LColor::added_space,
 722                                                   Painter::line_onoffdash);
 723                                         x_ += hfill_;
 724                                 } else {
 725                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 726                                                   LColor::added_space,
 727                                                   Painter::line_onoffdash);
 728                                         x_ += label_hfill_;
 729                                 }
 730                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 731                         }
 732                         x_ += 2;
 733                         ++vpos;
 734                 } else if (par_.isSeparator(pos)) {
 735                         x_ += width_pos;
 736                         if (pos >= body_pos)
 737                                 x_ += separator_;
 738                         ++vpos;
 739                 } else {
 740                         paintFromPos(vpos);
 741                 }
 742         }
 743
 744         // if we reach the end of a struck out range, paint it
 745         if (running_strikeout) {
 746                 // calculate 1/3 height of the buffer's default font
 747                 FontMetrics const & fm
 748                         = theFontMetrics(bv_.buffer()->params().getFont());
 749                 int const middle = yo_ - fm.maxAscent() / 3;
 750                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 751                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 752                 running_strikeout = false;
 753         }
 754 }
 755
 756
 757 size_type calculateRowSignature(Row const & row, Paragraph const & par,
 758         int x, int y)
 759 {
 760         boost::crc_32_type crc;
 761         for (pos_type i = row.pos(); i < row.endpos(); ++i) {
 762                 char_type const b[] = { par.getChar(i) };
 763                 crc.process_bytes(b, 1);
 764         }
 765         char_type const b[] = { x, y, row.width() };
 766         crc.process_bytes(b, 3);
 767         return crc.checksum();
 768 }
 769
 770
 771 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 772         RowList::const_iterator rit, LyXText const & text)
 773 {
 774         // Is there a cursor on this row (or inside inset on row)
 775         LCursor & cur = pi.base.bv->cursor();
 776         for (size_type d = 0; d < cur.depth(); ++d) {
 777                 CursorSlice const & sl = cur[d];
 778                 if (sl.text() == &text
 779                     && sl.pit() == pit
 780                     && sl.pos() >= rit->pos()
 781                     && sl.pos() <= rit->endpos())
 782                         return true;
 783         }
 784         return false;
 785 }
 786
 787
 788 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 789         RowList::const_iterator rit, LyXText const & text)
 790 {
 791         // Is there a cursor inside an inset on this row, and is this inset
 792         // the only "character" on this row
 793         LCursor & cur = pi.base.bv->cursor();
 794         if (rit->pos() + 1 != rit->endpos())
 795                 return false;
 796         for (size_type d = 0; d < cur.depth(); d++) {
 797                 CursorSlice const & sl = cur[d];
 798                 if (sl.text() == &text
 799                     && sl.pit() == pit
 800                     && sl.pos() == rit->pos())
 801                         return d < cur.depth() - 1;
 802         }
 803         return false;
 804 }
 805
 806
 807 void paintPar
 808         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 809          bool repaintAll)
 810 {
 811 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 812         int const ww = pi.base.bv->workHeight();
 813
 814         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 815
 816         Paragraph const & par = text.paragraphs()[pit];
 817         if (par.rows().empty())
 818                 return;
 819
 820         RowList::const_iterator const rb = par.rows().begin();
 821         RowList::const_iterator const re = par.rows().end();
 822
 823         y -= rb->ascent();
 824         size_type rowno = 0;
 825         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 826                 y += rit->ascent();
 827                 // Allow setting of refreshInside for nested insets in
 828                 // this row only
 829                 bool tmp = refreshInside;
 830
 831                 // Row signature; has row changed since last paint?
 832                 size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 833                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 834
 835                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 836                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 837                         text);
 838
 839                 // If this is the only object on the row, we can make it wide
 840                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 841                         InsetBase const * const in = par.getInset(i);
 842                         if (in) {
 843                                 InsetText const * const t = in->asTextInset();
 844                                 if (t)
 845                                         t->Wide() = in_inset_alone_on_row;
 846                         }
 847                 }
 848
 849                 // If selection is on, the current row signature differs
 850                 // from cache, or cursor is inside an inset _on this row_,
 851                 // then paint the row
 852                 if (repaintAll || row_has_changed || cursor_on_row) {
 853                         // Add to row signature cache
 854                         par.rowSignature()[rowno] = row_sig;
 855
 856                         bool const inside = (y + rit->descent() >= 0
 857                                 && y - rit->ascent() < ww);
 858                         // it is not needed to draw on screen if we are not inside.
 859                         pi.pain.setDrawingEnabled(inside);
 860                         RowPainter rp(pi, text, pit, *rit, x, y);
 861                         // Clear background of this row
 862                         // (if paragraph background was not cleared)
 863                         if (!repaintAll &&
 864                             (!in_inset_alone_on_row || row_has_changed)) {
 865                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 866                                     text.maxwidth_, rit->height(),
 867                                     text.backgroundColor());
 868                                 // If outer row has changed, force nested
 869                                 // insets to repaint completely
 870                                 if (row_has_changed)
 871                                         refreshInside = true;
 872                         }
 873
 874                         // Instrumentation for testing row cache (see also
 875                         // 12 lines lower):
 876                         if (text.isMainText(*pi.base.bv->buffer()))
 877                                 lyxerr[Debug::PAINTING] << "#";
 878                         else
 879                                 lyxerr[Debug::PAINTING] << "[" <<
 880                                     repaintAll << row_has_changed <<
 881                                     cursor_on_row << "]";
 882                         rp.paintAppendix();
 883                         rp.paintDepthBar();
 884                         rp.paintChangeBar();
 885                         if (rit == rb)
 886                                 rp.paintFirst();
 887                         if (rit + 1 == re)
 888                                 rp.paintLast();
 889                         rp.paintText();
 890                 }
 891                 y += rit->descent();
 892                 // Restore, see above
 893                 refreshInside = tmp;
 894         }
 895         // Re-enable screen drawing for future use of the painter.
 896         pi.pain.setDrawingEnabled(true);
 897
 898         lyxerr[Debug::PAINTING] << "." << endl;
 899 }
 900
 901 } // namespace anon
 902
 903
 904 void paintText(BufferView & bv,
 905                Painter & pain)
 906 {
 907         BOOST_ASSERT(bv.buffer());
 908         Buffer const & buffer = *bv.buffer();
 909         LyXText & text = buffer.text();
 910         bool const select = bv.cursor().selection();
 911         ViewMetricsInfo const & vi = bv.viewMetricsInfo();
 912
 913         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 914         // Should the whole screen, including insets, be refreshed?
 915         bool repaintAll = select || !vi.singlepar;
 916
 917         if (repaintAll) {
 918                 // Clear background (if not delegated to rows)
 919                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 920                         text.backgroundColor());
 921         }
 922         if (select) {
 923                 text.drawSelection(pi, 0, 0);
 924         }
 925
 926         int yy = vi.y1;
 927         // draw contents
 928         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 929                 refreshInside = repaintAll;
 930                 Paragraph const & par = text.getPar(pit);
 931                 yy += par.ascent();
 932                 paintPar(pi, text, pit, 0, yy, repaintAll);
 933                 yy += par.descent();
 934         }
 935
 936         // Cache one paragraph above and one below
 937         // Note MV: this cannot be suppressed even for singlepar.
 938         // Try viewing the User Guide Mobius figure
 939
 940         if (vi.p1 > 0) {
 941                 text.redoParagraph(bv, vi.p1 - 1);
 942                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 943                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 944         }
 945
 946         if (vi.p2 < pit_type(text.paragraphs().size()) - 1) {
 947                 text.redoParagraph(bv, vi.p2 + 1);
 948                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 949                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 950         }
 951
 952         // and grey out above (should not happen later)
 953 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 954         if (vi.y1 > 0 && !vi.singlepar)
 955                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 956
 957         // and possibly grey out below
 958 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 959         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 960                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 961 }
 962
 963
 964 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 965 {
 966 //      lyxerr << "  paintTextInset: y: " << y << endl;
 967
 968         y -= text.getPar(0).ascent();
 969         // This flag can not be set from within same inset:
 970         bool repaintAll = refreshInside;
 971         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 972                 y += text.getPar(pit).ascent();
 973                 paintPar(pi, text, pit, x, y, repaintAll);
 974                 y += text.getPar(pit).descent();
 975         }
 976 }
 977
 978
 979 } // namespace lyx