]> git.lyx.org Git - lyx.git/blobdiff - src/rowpainter.C
Partially extracted from r14281 from the younes branch.
[lyx.git] / src / rowpainter.C
index f77fd189153d2266520f5d07a2db745f2b5bd43a..498d1c982f12a8fd6da67bd8aadf7f4460c036d0 100644 (file)
@@ -14,6 +14,7 @@
 #include "rowpainter.h"
 
 #include "buffer.h"
+#include "coordcache.h"
 #include "cursor.h"
 #include "debug.h"
 #include "bufferparams.h"
 #include "vspace.h"
 
 #include "frontends/font_metrics.h"
+#include "frontends/nullpainter.h"
+#include "frontends/LyXView.h"
+#include "frontends/WorkArea.h"
 #include "frontends/Painter.h"
 
 #include "insets/insettext.h"
 
 #include "support/textutils.h"
 
+#include <boost/crc.hpp>
+
+using lyx::frontend::Painter;
+using lyx::frontend::NullPainter;
+using lyx::char_type;
 using lyx::pos_type;
+using lyx::pit_type;
 
 using std::endl;
 using std::max;
+using std::min;
 using std::string;
 
-extern int NEST_MARGIN;
-extern int CHANGEBAR_MARGIN;
 
 namespace {
 
+/// Flag: do a full redraw of inside text of inset
+/// Working variable indicating a full screen refresh
+bool refreshInside;
+
 /**
  * A class used for painting an individual row of text.
  */
 class RowPainter {
 public:
        /// initialise and run painter
-       RowPainter(BufferView const & bv, LyXText const & text,
-               ParagraphList::iterator pit, RowList::iterator rit, int xo, int yo);
-private:
+       RowPainter(PainterInfo & pi, LyXText const & text,
+               pit_type pit, Row const & row, int x, int y);
+
        // paint various parts
-       void paintBackground();
-       void paintSelection();
        void paintAppendix();
        void paintDepthBar();
        void paintChangeBar();
        void paintFirst();
        void paintLast();
-       void paintForeignMark(double orig_x, LyXFont const & orig_font);
-       void paintHebrewComposeChar(lyx::pos_type & vpos);
-       void paintArabicComposeChar(lyx::pos_type & vpos);
-       void paintChars(lyx::pos_type & vpos, bool hebrew, bool arabic);
-       int paintAppendixStart(int y);
        void paintText();
+
+private:
+       void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
+       void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
+       void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
+       void paintChars(lyx::pos_type & vpos, LyXFont font,
+                       bool hebrew, bool arabic);
+       int paintAppendixStart(int y);
        void paintFromPos(lyx::pos_type & vpos);
-       void paintInset(lyx::pos_type const pos);
+       void paintInset(lyx::pos_type const pos, LyXFont const & font);
 
        /// return left margin
        int leftMargin() const;
 
-       /// return the font at the given pos
-       LyXFont const getFont(lyx::pos_type pos) const;
-
        /// return the label font for this row
        LyXFont const getLabelFont() const;
 
-       /// return pixel width for the given pos
-       int singleWidth(lyx::pos_type pos) const;
-       int singleWidth(lyx::pos_type pos, char c) const;
-
        /// bufferview to paint on
        BufferView const & bv_;
 
@@ -96,17 +103,21 @@ private:
 
        /// LyXText for the row
        LyXText const & text_;
+       ParagraphList const & pars_;
 
        /// The row to paint
-       RowList::iterator const rit_;
-       Row & row_;
+       Row const & row_;
 
        /// Row's paragraph
-       mutable ParagraphList::iterator  pit_;
+       pit_type const pit_;
+       Paragraph const & par_;
+
+       /// is row erased? (change tracking)
+       bool erased_;
 
        // Looks ugly - is
-       double xo_;
-       int yo_;
+       double const xo_;
+       int const yo_;    // current baseline
        double x_;
        int width_;
        double separator_;
@@ -115,69 +126,31 @@ private:
 };
 
 
-RowPainter::RowPainter(BufferView const & bv, LyXText const & text,
-     ParagraphList::iterator pit, RowList::iterator rit,
-     int xo, int yo)
-       : bv_(bv), pain_(bv_.painter()), text_(text), rit_(rit), row_(*rit),
-         pit_(pit), xo_(xo), yo_(yo), x_(row_.x()),
-               width_(text_.textWidth()),
-               separator_(row_.fill_separator()),
-               hfill_(row_.fill_hfill()),
-               label_hfill_(row_.fill_label_hfill())
+RowPainter::RowPainter(PainterInfo & pi,
+       LyXText const & text, pit_type pit, Row const & row, int x, int y)
+       : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
+         row_(row), pit_(pit), par_(text.paragraphs()[pit]),
+         erased_(pi.erased_),
+         xo_(x), yo_(y), width_(text_.width())
 {
-       x_ += xo_;
-
-       // background has already been cleared.
-       if (&text_ == bv_.text())
-               paintBackground();
-
-       // paint the selection background
-       if (text_.selection.set() && &text_ == bv_.cursor().innerText())
-               paintSelection();
-
-       // vertical lines for appendix
-       paintAppendix();
-
-       // environment depth brackets
-       paintDepthBar();
-
-       // changebar
-       paintChangeBar();
+       RowMetrics m = text_.computeRowMetrics(pit, row_);
+       x_ = m.x + xo_;
 
-       if (row_.pos() == 0)
-               paintFirst();
+       //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
+       //row_.dump();
 
-       if (row_.endpos() >= pit_->size())
-               paintLast();
+       separator_ = m.separator;
+       hfill_ = m.hfill;
+       label_hfill_ = m.label_hfill;
 
-       // paint text
-       paintText();
-}
-
-
-/// "temporary"
-LyXFont const RowPainter::getFont(pos_type pos) const
-{
-       return text_.getFont(pit_, pos);
-}
-
-
-int RowPainter::singleWidth(lyx::pos_type pos) const
-{
-       return text_.singleWidth(pit_, pos);
-}
-
-
-int RowPainter::singleWidth(lyx::pos_type pos, char c) const
-{
-       LyXFont const & font = text_.getFont(pit_, pos);
-       return text_.singleWidth(pit_, pos, c, font);
+       BOOST_ASSERT(pit >= 0);
+       BOOST_ASSERT(pit < int(text.paragraphs().size()));
 }
 
 
 LyXFont const RowPainter::getLabelFont() const
 {
-       return text_.getLabelFont(pit_);
+       return text_.getLabelFont(par_);
 }
 
 
@@ -187,39 +160,54 @@ int RowPainter::leftMargin() const
 }
 
 
-void RowPainter::paintInset(pos_type const pos)
+void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 {
-       InsetOld * inset = const_cast<InsetOld*>(pit_->getInset(pos));
-
+       InsetBase const * inset = par_.getInset(pos);
        BOOST_ASSERT(inset);
-
-       PainterInfo pi(const_cast<BufferView *>(&bv_));
-       pi.base.font = getFont(pos);
-       inset->draw(pi, int(x_), yo_ + row_.baseline());
+       PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
+       // FIXME: We should always use font, see documentation of
+       // noFontChange() in insetbase.h.
+       pi.base.font = inset->noFontChange() ?
+               bv_.buffer()->params().getFont() :
+               font;
+       pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
+       pi.erased_ = erased_ || isDeletedText(par_, pos);
+       theCoords.insets().add(inset, int(x_), yo_);
+       InsetText const * const in = inset->asTextInset();
+       // non-wide insets are painted completely. Recursive
+       bool tmp = refreshInside;
+       if (!in || !in->Wide()) {
+               refreshInside = true;
+               lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
+       }
+       if (refreshInside)
+               inset->drawSelection(pi, int(x_), yo_);
+       inset->draw(pi, int(x_), yo_);
+       refreshInside = tmp;
        x_ += inset->width();
 }
 
 
-void RowPainter::paintHebrewComposeChar(pos_type & vpos)
+void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 {
        pos_type pos = text_.bidi.vis2log(vpos);
 
        string str;
 
        // first char
-       char c = pit_->getChar(pos);
+       char_type c = par_.getChar(pos);
        str += c;
        ++vpos;
 
-       LyXFont const & font = getFont(pos);
        int const width = font_metrics::width(c, font);
        int dx = 0;
 
        for (pos_type i = pos - 1; i >= 0; --i) {
-               c = pit_->getChar(i);
-               if (!Encodings::IsComposeChar_hebrew(c)) {
-                       if (IsPrintableNonspace(c)) {
-                               int const width2 = singleWidth(i, c);
+               c = par_.getChar(i);
+               if (!Encodings::isComposeChar_hebrew(c)) {
+                       if (isPrintableNonspace(c)) {
+                               int const width2 =
+                                       text_.singleWidth(par_, i, c, text_.getFont(par_, i));
                                // dalet / resh
                                dx = (c == 'ø' || c == 'ã')
                                        ? width2 - width
@@ -230,108 +218,104 @@ void RowPainter::paintHebrewComposeChar(pos_type & vpos)
        }
 
        // Draw nikud
-       pain_.text(int(x_) + dx, yo_ + row_.baseline(), str, font);
+       pain_.text(int(x_) + dx, yo_, str, font);
 }
 
 
-void RowPainter::paintArabicComposeChar(pos_type & vpos)
+void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 {
        pos_type pos = text_.bidi.vis2log(vpos);
        string str;
 
        // first char
-       char c = pit_->getChar(pos);
-       c = pit_->transformChar(c, pos);
-       str +=c;
+       char_type c = par_.getChar(pos);
+       c = par_.transformChar(c, pos);
+       str += c;
        ++vpos;
 
-       LyXFont const & font = getFont(pos);
        int const width = font_metrics::width(c, font);
        int dx = 0;
 
        for (pos_type i = pos - 1; i >= 0; --i) {
-               c = pit_->getChar(i);
-               if (!Encodings::IsComposeChar_arabic(c)) {
-                       if (IsPrintableNonspace(c)) {
-                               int const width2 = singleWidth(i, c);
+               c = par_.getChar(i);
+               if (!Encodings::isComposeChar_arabic(c)) {
+                       if (isPrintableNonspace(c)) {
+                               int const width2 =
+                                       text_.singleWidth(par_, i, c, text_.getFont(par_, i));
                                dx = (width2 - width) / 2;
                        }
                        break;
                }
        }
        // Draw nikud
-       pain_.text(int(x_) + dx, yo_ + row_.baseline(), str, font);
+       pain_.text(int(x_) + dx, yo_, str, font);
 }
 
 
-void RowPainter::paintChars(pos_type & vpos, bool hebrew, bool arabic)
+void RowPainter::paintChars(pos_type & vpos, LyXFont font,
+                           bool hebrew, bool arabic)
 {
        pos_type pos = text_.bidi.vis2log(vpos);
        pos_type const end = row_.endpos();
-       LyXFont orig_font = getFont(pos);
+       FontSpan const font_span = par_.fontSpan(pos);
+       Change::Type const prev_change = par_.lookupChange(pos).type;
 
        // first character
        string str;
-       str += pit_->getChar(pos);
+       str += par_.getChar(pos);
        if (arabic) {
                unsigned char c = str[0];
-               str[0] = pit_->transformChar(c, pos);
+               str[0] = par_.transformChar(c, pos);
        }
 
-       bool prev_struckout = isDeletedText(*pit_, pos);
-       bool prev_newtext = isInsertedText(*pit_, pos);
-
        // collect as much similar chars as we can
-       for (++vpos; vpos < end && (pos = text_.bidi.vis2log(vpos)) >= 0; ++vpos) {
-               char c = pit_->getChar(pos);
-
-               if (!IsPrintableNonspace(c))
+       for (++vpos ; vpos < end ; ++vpos) {
+               pos = text_.bidi.vis2log(vpos);
+               if (pos < font_span.first || pos > font_span.last)
                        break;
 
-               if (prev_struckout != isDeletedText(*pit_, pos))
+               if (prev_change != par_.lookupChange(pos))
                        break;
 
-               if (prev_newtext != isInsertedText(*pit_, pos))
-                       break;
+               char_type c = par_.getChar(pos);
 
-               if (arabic && Encodings::IsComposeChar_arabic(c))
+               if (!isPrintableNonspace(c))
                        break;
 
-               if (hebrew && Encodings::IsComposeChar_hebrew(c))
+               if (arabic && Encodings::isComposeChar_arabic(c))
                        break;
 
-               if (orig_font != getFont(pos))
+               if (hebrew && Encodings::isComposeChar_hebrew(c))
                        break;
 
                if (arabic)
-                       c = pit_->transformChar(c, pos);
+                       c = par_.transformChar(c, pos);
 
                str += c;
        }
 
-       if (prev_struckout)
-               orig_font.setColor(LColor::strikeout);
-       else if (prev_newtext)
-               orig_font.setColor(LColor::newtext);
+       if (prev_change == Change::DELETED)
+               font.setColor(LColor::strikeout);
+       else if (prev_change == Change::INSERTED)
+               font.setColor(LColor::newtext);
 
        // Draw text and set the new x position
-       //lyxerr << "paint row: yo_ " << yo_ << " baseline: " << row_.baseline()
-       //      << "\n";
-       pain_.text(int(x_), yo_ + row_.baseline(), str, orig_font);
-       x_ += font_metrics::width(str, orig_font);
+       //lyxerr << "paint row: yo_ " << yo_ << "\n";
+       pain_.text(int(x_), yo_, str, font);
+       x_ += font_metrics::width(str, font);
 }
 
 
-void RowPainter::paintForeignMark(double orig_x, LyXFont const & orig_font)
+void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 {
        if (!lyxrc.mark_foreign_language)
                return;
-       if (orig_font.language() == latex_language)
+       if (font.language() == latex_language)
                return;
-       if (orig_font.language() == bv_.buffer()->params().language)
+       if (font.language() == bv_.buffer()->params().language)
                return;
 
-       int const y = yo_ + row_.baseline() + 1;
+       int const y = yo_ + 1 + desc;
        pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 }
 
@@ -339,223 +323,113 @@ void RowPainter::paintForeignMark(double orig_x, LyXFont const & orig_font)
 void RowPainter::paintFromPos(pos_type & vpos)
 {
        pos_type const pos = text_.bidi.vis2log(vpos);
-
-       LyXFont const & orig_font = getFont(pos);
+       LyXFont orig_font = text_.getFont(par_, pos);
 
        double const orig_x = x_;
 
-       char const c = pit_->getChar(pos);
-
-       if (c == Paragraph::META_INSET) {
-               paintInset(pos);
+       if (par_.isInset(pos)) {
+               paintInset(pos, orig_font);
                ++vpos;
-               paintForeignMark(orig_x, orig_font);
+               paintForeignMark(orig_x, orig_font,
+                       par_.getInset(pos)->descent());
                return;
        }
 
        // usual characters, no insets
+       char_type const c = par_.getChar(pos);
 
        // special case languages
-       bool const hebrew = (orig_font.language()->lang() == "hebrew");
-       bool const arabic =
-               orig_font.language()->lang() == "arabic" &&
+       std::string const & lang = orig_font.language()->lang();
+       bool const hebrew = lang == "hebrew";
+       bool const arabic = lang == "arabic" &&
                (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
                lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 
        // draw as many chars as we can
        if ((!hebrew && !arabic)
-               || (hebrew && !Encodings::IsComposeChar_hebrew(c))
-               || (arabic && !Encodings::IsComposeChar_arabic(c))) {
-               paintChars(vpos, hebrew, arabic);
+               || (hebrew && !Encodings::isComposeChar_hebrew(c))
+               || (arabic && !Encodings::isComposeChar_arabic(c))) {
+               paintChars(vpos, orig_font, hebrew, arabic);
        } else if (hebrew) {
-               paintHebrewComposeChar(vpos);
+               paintHebrewComposeChar(vpos, orig_font);
        } else if (arabic) {
-               paintArabicComposeChar(vpos);
+               paintArabicComposeChar(vpos, orig_font);
        }
 
        paintForeignMark(orig_x, orig_font);
 }
 
 
-void RowPainter::paintBackground()
-{
-       int const x = int(xo_);
-       int const y = yo_ < 0 ? 0 : yo_;
-       int const h = yo_ < 0 ? row_.height() + yo_ : row_.height();
-       pain_.fillRectangle(x, y, width_, h, text_.backgroundColor());
-}
-
-
-void RowPainter::paintSelection()
-{
-       bool const is_rtl = pit_->isRightToLeftPar(bv_.buffer()->params());
-
-       // the current selection
-       int const startx = text_.cursorX(text_.selStart());
-       int const endx = text_.cursorX(text_.selEnd());
-       int const starty = text_.cursorY(text_.selStart());
-       int const endy = text_.cursorY(text_.selEnd());
-       ParagraphList::iterator startpit = text_.getPar(text_.selStart());
-       ParagraphList::iterator endpit = text_.getPar(text_.selEnd());
-       RowList::iterator startrow = startpit->getRow(text_.selStart().pos());
-       RowList::iterator endrow = endpit->getRow(text_.selEnd().pos());
-       int const h = row_.height();
-
-       int const row_y = pit_->y + row_.y_offset();
-
-       bool const sel_starts_here = startpit == pit_ && startrow == rit_;
-       bool const sel_ends_here   = endpit == pit_ && endrow == rit_;
-       bool const sel_on_one_row  = sel_starts_here && sel_ends_here;
-
-       if (text_.bidi.same_direction()) {
-               int x;
-               int w;
-               if (sel_on_one_row) {
-                       if (startx < endx) {
-                               x = int(xo_) + startx;
-                               w = endx - startx;
-                       } else {
-                               x = int(xo_) + endx;
-                               w = startx - endx;
-                       }
-                       pain_.fillRectangle(x, yo_, w, h, LColor::selection);
-               } else if (sel_starts_here) {
-                       int const x = is_rtl ? int(xo_) : int(xo_ + startx);
-                       int const w = is_rtl ? startx : (width_ - startx);
-                       pain_.fillRectangle(x, yo_, w, h, LColor::selection);
-               } else if (sel_ends_here) {
-                       int const x = is_rtl ? int(xo_ + endx) : int(xo_);
-                       int const w = is_rtl ? (width_ - endx) : endx;
-                       pain_.fillRectangle(x, yo_, w, h, LColor::selection);
-               } else if (row_y > starty && row_y < endy) {
-                       pain_.fillRectangle(int(xo_), yo_, width_, h, LColor::selection);
-               }
-               return;
-       }
-
-       if ((startpit != pit_ && startrow != rit_ && !is_rtl)
-               || (endpit != pit_ && endrow != rit_ && is_rtl))
-               pain_.fillRectangle(int(xo_), yo_,
-                       int(x_), h, LColor::selection);
-
-       pos_type const body_pos = pit_->beginOfBody();
-       pos_type const end = row_.endpos();
-       double tmpx = x_;
-
-       for (pos_type vpos = row_.pos(); vpos < end; ++vpos)  {
-               pos_type pos = text_.bidi.vis2log(vpos);
-               double const old_tmpx = tmpx;
-               if (body_pos > 0 && pos == body_pos - 1) {
-                       LyXLayout_ptr const & layout = pit_->layout();
-                       LyXFont const lfont = getLabelFont();
-
-                       tmpx += label_hfill_ + font_metrics::width(layout->labelsep, lfont);
-
-                       if (pit_->isLineSeparator(body_pos - 1))
-                               tmpx -= singleWidth(body_pos - 1);
-               }
-
-               tmpx += singleWidth(pos);
-
-               if (hfillExpansion(*pit_, row_, pos)) {
-                       if (pos >= body_pos)
-                               tmpx += hfill_;
-                       else
-                               tmpx += label_hfill_;
-               } else {
-                       if (pit_->isSeparator(pos) && pos >= body_pos)
-                               tmpx += separator_;
-               }
-
-               if (((startpit != pit_ && startrow != rit_)
-                               || text_.selStart().pos() <= pos) &&
-                       ((endpit != pit_ && endrow != rit_)
-                               || pos < text_.selEnd().pos())) {
-                       // Here we do not use x_ as xo_ was added to x_.
-                       pain_.fillRectangle(int(old_tmpx), yo_,
-                               int(tmpx - old_tmpx + 1), h, LColor::selection);
-               }
-       }
-
-       if ((startpit != pit_ && startrow != rit_ && is_rtl) ||
-           (endpit != pit_ && endrow != rit_ && !is_rtl)) {
-               pain_.fillRectangle(int(xo_ + tmpx),
-                       yo_, int(width_ - tmpx), h, LColor::selection);
-       }
-}
-
-
 void RowPainter::paintChangeBar()
 {
        pos_type const start = row_.pos();
        pos_type const end = row_.endpos();
 
-       if (start == end || !pit_->isChanged(start, end - 1))
+       if (start == end || !par_.isChanged(start, end))
                return;
 
        int const height = text_.isLastRow(pit_, row_)
-               ? row_.baseline()
-               : row_.height() + boost::next(rit_)->top_of_text();
+               ? row_.ascent()
+               : row_.height();
 
-       pain_.fillRectangle(4, yo_, 5, height, LColor::changebar);
+       pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 }
 
 
 void RowPainter::paintAppendix()
 {
-       if (!pit_->params().appendix())
+       if (!par_.params().appendix())
                return;
 
-       // FIXME: can be just width_ ?
-       int const ww = width_;
+       int y = yo_ - row_.ascent();
 
-       int y = yo_;
-
-       if (pit_->params().startOfAppendix())
+       if (par_.params().startOfAppendix())
                y += 2 * defaultRowHeight();
 
        pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
-       pain_.line(ww - 2, y, ww - 2, yo_ + row_.height(), LColor::appendix);
+       pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 }
 
 
 void RowPainter::paintDepthBar()
 {
-       Paragraph::depth_type const depth = pit_->getDepth();
+       Paragraph::depth_type const depth = par_.getDepth();
 
        if (depth <= 0)
                return;
 
        Paragraph::depth_type prev_depth = 0;
        if (!text_.isFirstRow(pit_, row_)) {
-               ParagraphList::iterator pit2 = pit_;
+               pit_type pit2 = pit_;
                if (row_.pos() == 0)
                        --pit2;
-               prev_depth = pit2->getDepth();
+               prev_depth = pars_[pit2].getDepth();
        }
 
        Paragraph::depth_type next_depth = 0;
        if (!text_.isLastRow(pit_, row_)) {
-               ParagraphList::iterator pit2 = pit_;
-               if (row_.endpos() >= pit2->size())
+               pit_type pit2 = pit_;
+               if (row_.endpos() >= pars_[pit2].size())
                        ++pit2;
-               next_depth = pit2->getDepth();
+               next_depth = pars_[pit2].getDepth();
        }
 
        for (Paragraph::depth_type i = 1; i <= depth; ++i) {
-               int const w = NEST_MARGIN / 5;
-               int x = int(w * i + xo_);
-               // only consider the changebar space if we're drawing outer left
-               if (xo_ == 0)
-                       x += CHANGEBAR_MARGIN;
-               int const h = yo_ + row_.height() - 1 - (i - next_depth - 1) * 3;
+               int const w = nestMargin() / 5;
+               int x = int(xo_) + w * i;
+               // only consider the changebar space if we're drawing outermost text
+               if (text_.isMainText())
+                       x += changebarMargin();
+
+               int const starty = yo_ - row_.ascent();
+               int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 
-               pain_.line(x, yo_, x, h, LColor::depthbar);
+               pain_.line(x, starty, x, starty + h, LColor::depthbar);
 
                if (i > prev_depth)
-                       pain_.fillRectangle(x, yo_, w, 2, LColor::depthbar);
+                       pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
                if (i > next_depth)
-                       pain_.fillRectangle(x, h, w, 2, LColor::depthbar);
+                       pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
        }
 }
 
@@ -586,28 +460,27 @@ int RowPainter::paintAppendixStart(int y)
 
 void RowPainter::paintFirst()
 {
-       ParagraphParameters const & parparams = pit_->params();
+       ParagraphParameters const & parparams = par_.params();
 
        int y_top = 0;
 
        // start of appendix?
        if (parparams.startOfAppendix())
-               y_top += paintAppendixStart(yo_ + y_top + 2 * defaultRowHeight());
+               y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 
        Buffer const & buffer = *bv_.buffer();
 
-       LyXLayout_ptr const & layout = pit_->layout();
+       LyXLayout_ptr const & layout = par_.layout();
 
        if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
-               if (pit_ != text_.paragraphs().begin()) {
+               if (pit_ != 0) {
                        if (layout->latextype == LATEX_PARAGRAPH
-                               && !pit_->getDepth()) {
+                               && !par_.getDepth()) {
                                y_top += buffer.params().getDefSkip().inPixels(bv_);
                        } else {
-                               LyXLayout_ptr const & playout =
-                                       boost::prior(pit_)->layout();
+                               LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
                                if (playout->latextype == LATEX_PARAGRAPH
-                                       && !boost::prior(pit_)->getDepth()) {
+                                       && !pars_[pit_ - 1].getDepth()) {
                                        // is it right to use defskip here, too? (AS)
                                        y_top += buffer.params().getDefSkip().inPixels(bv_);
                                }
@@ -615,11 +488,9 @@ void RowPainter::paintFirst()
                }
        }
 
-       int const ww = bv_.workWidth();
-
-       bool const is_rtl = pit_->isRightToLeftPar(bv_.buffer()->params());
+       bool const is_rtl = text_.isRTL(par_);
        bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
-       //lyxerr << "paintFirst: " << pit_->id() << " is_seq: " << is_seq << std::endl;
+       //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 
        // should we print a label?
        if (layout->labeltype >= LABEL_STATIC
@@ -627,47 +498,43 @@ void RowPainter::paintFirst()
                      || layout->latextype != LATEX_ENVIRONMENT
                      || is_seq)) {
 
-               LyXFont font = getLabelFont();
-               if (!pit_->getLabelstring().empty()) {
+               LyXFont const font = getLabelFont();
+               string const str = par_.getLabelstring();
+               if (!str.empty()) {
                        double x = x_;
-                       string const str = pit_->getLabelstring();
 
                        // this is special code for the chapter layout. This is
                        // printed in an extra row and has a pagebreak at
                        // the top.
                        if (layout->counter == "chapter") {
-                               if (buffer.params().secnumdepth >= 0) {
-                                       float spacing_val = 1.0;
-                                       if (!parparams.spacing().isDefault()) {
-                                               spacing_val = parparams.spacing().getValue();
-                                       } else {
-                                               spacing_val = buffer.params().spacing().getValue();
-                                       }
-
-                                       int const maxdesc =
-                                               int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
-                                               + int(layout->parsep) * defaultRowHeight();
-
-                                       if (is_rtl) {
-                                               x = ww - leftMargin() -
-                                                       font_metrics::width(str, font);
-                                       }
-
-                                       pain_.text(int(x),
-                                               yo_ + row_.baseline() -
-                                               row_.ascent_of_text() - maxdesc,
-                                               str, font);
+                               double spacing_val = 1.0;
+                               if (!parparams.spacing().isDefault()) {
+                                       spacing_val = parparams.spacing().getValue();
+                               } else {
+                                       spacing_val = buffer.params().spacing().getValue();
+                               }
+
+                               int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
+
+                               int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
+                                       + int(layout->parsep) * defaultRowHeight();
+
+                               if (is_rtl) {
+                                       x = width_ - leftMargin() -
+                                               font_metrics::width(str, font);
                                }
+
+                               pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
                        } else {
                                if (is_rtl) {
-                                       x = ww - leftMargin()
+                                       x = width_ - leftMargin()
                                                + font_metrics::width(layout->labelsep, font);
                                } else {
                                        x = x_ - font_metrics::width(layout->labelsep, font)
                                                - font_metrics::width(str, font);
                                }
 
-                               pain_.text(int(x), yo_ + row_.baseline(), str, font);
+                               pain_.text(int(x), yo_, str, font);
                        }
                }
 
@@ -678,14 +545,15 @@ void RowPainter::paintFirst()
                layout->labeltype == LABEL_BIBLIO ||
                layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
                LyXFont font = getLabelFont();
-               if (!pit_->getLabelstring().empty()) {
-                       string const str = pit_->getLabelstring();
-                       float spacing_val = 1.0;
-                       if (!parparams.spacing().isDefault()) {
+               if (!par_.getLabelstring().empty()) {
+                       string const str = par_.getLabelstring();
+                       double spacing_val = 1.0;
+                       if (!parparams.spacing().isDefault())
                                spacing_val = parparams.spacing().getValue();
-                       } else {
+                       else
                                spacing_val = buffer.params().spacing().getValue();
-                       }
+
+                       int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 
                        int maxdesc =
                                int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
@@ -693,16 +561,15 @@ void RowPainter::paintFirst()
 
                        double x = x_;
                        if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
-                               x = ((is_rtl ? leftMargin() : x_)
-                                        + ww - text_.rightMargin(*pit_)) / 2;
+                               if (is_rtl)
+                                       x = leftMargin();
+                               x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
                                x -= font_metrics::width(str, font) / 2;
                        } else if (is_rtl) {
-                               x = ww - leftMargin() -
+                               x = width_ - leftMargin() -
                                        font_metrics::width(str, font);
                        }
-                       pain_.text(int(x),
-                           yo_ + row_.baseline() - row_.ascent_of_text() - maxdesc,
-                                 str, font);
+                       pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
                }
        }
 }
@@ -710,8 +577,7 @@ void RowPainter::paintFirst()
 
 void RowPainter::paintLast()
 {
-       int const ww = bv_.workWidth();
-       bool const is_rtl = pit_->isRightToLeftPar(bv_.buffer()->params());
+       bool const is_rtl = text_.isRTL(par_);
        int const endlabel = getEndLabel(pit_, text_.paragraphs());
 
        // draw an endlabel
@@ -720,11 +586,11 @@ void RowPainter::paintLast()
        case END_LABEL_FILLED_BOX: {
                LyXFont const font = getLabelFont();
                int const size = int(0.75 * font_metrics::maxAscent(font));
-               int const y = yo_ + row_.baseline() - size;
-               int x = is_rtl ? NEST_MARGIN + CHANGEBAR_MARGIN: ww - size;
+               int const y = yo_ - size;
+               int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 
-               if (row_.fill() <= size)
-                       x += (size - row_.fill() + 1) * (is_rtl ? -1 : 1);
+               if (width_ - int(row_.width()) <= size)
+                       x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 
                if (endlabel == END_LABEL_BOX)
                        pain_.rectangle(x, y, size, size, LColor::eolmarker);
@@ -735,11 +601,11 @@ void RowPainter::paintLast()
 
        case END_LABEL_STATIC: {
                LyXFont font = getLabelFont();
-               string const & str = pit_->layout()->endlabelstring();
+               string const & str = par_.layout()->endlabelstring();
                double const x = is_rtl ?
                        x_ - font_metrics::width(str, font)
-                       : ww - text_.rightMargin(*pit_) - row_.fill();
-               pain_.text(int(x), yo_ + row_.baseline(), str, font);
+                       : - text_.rightMargin(par_) - row_.width();
+               pain_.text(int(x), yo_, str, font);
                break;
        }
 
@@ -752,49 +618,65 @@ void RowPainter::paintLast()
 void RowPainter::paintText()
 {
        pos_type const end = row_.endpos();
-       pos_type body_pos = pit_->beginOfBody();
+       pos_type body_pos = par_.beginOfBody();
        if (body_pos > 0 &&
-               (body_pos > end || !pit_->isLineSeparator(body_pos - 1))) {
+               (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
                body_pos = 0;
        }
 
-       LyXLayout_ptr const & layout = pit_->layout();
+       LyXLayout_ptr const & layout = par_.layout();
 
        bool running_strikeout = false;
        bool is_struckout = false;
        int last_strikeout_x = 0;
 
+       // Use font span to speed things up, see below
+       FontSpan font_span;
+       LyXFont font;
+
        for (pos_type vpos = row_.pos(); vpos < end; ) {
                if (x_ > bv_.workWidth())
                        break;
 
-               pos_type pos = text_.bidi.vis2log(vpos);
+               pos_type const pos = text_.bidi.vis2log(vpos);
 
-               if (pos >= pit_->size()) {
+               if (pos >= par_.size()) {
                        ++vpos;
                        continue;
                }
 
-               if (x_ + singleWidth(pos) < 0) {
-                       x_ += singleWidth(pos);
+               // Use font span to speed things up, see above
+               if (vpos < font_span.first || vpos > font_span.last) {
+                       font_span = par_.fontSpan(vpos);
+                       font = text_.getFont(par_, vpos);
+               }
+
+               const int width_pos =
+                       text_.singleWidth(par_, pos, par_.getChar(pos), font);
+
+               if (x_ + width_pos < 0) {
+                       x_ += width_pos;
                        ++vpos;
                        continue;
                }
 
-               is_struckout = isDeletedText(*pit_, pos);
+               is_struckout = isDeletedText(par_, pos);
 
                if (is_struckout && !running_strikeout) {
                        running_strikeout = true;
                        last_strikeout_x = int(x_);
                }
 
-               bool const highly_editable_inset = pit_->isInset(pos)
-                       && isHighlyEditableInset(pit_->getInset(pos));
+               bool const highly_editable_inset = par_.isInset(pos)
+                       && isHighlyEditableInset(par_.getInset(pos));
 
-               // if we reach the end of a struck out range, paint it
-               // we also don't paint across things like tables
+               // If we reach the end of a struck out range, paint it.
+               // We also don't paint across things like tables
                if (running_strikeout && (highly_editable_inset || !is_struckout)) {
-                       int const middle = yo_ + (row_.baseline() + row_.top_of_text()) / 2;
+                       // Calculate 1/3 height of the buffer's default font
+                       int const middle =
+                               yo_ -
+                               font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
                        pain_.line(last_strikeout_x, middle, int(x_), middle,
                                LColor::strikeout, Painter::line_solid, Painter::line_thin);
                        running_strikeout = false;
@@ -804,18 +686,18 @@ void RowPainter::paintText()
                        int const lwidth = font_metrics::width(layout->labelsep,
                                getLabelFont());
 
-                       x_ += label_hfill_ + lwidth - singleWidth(body_pos - 1);
+                       x_ += label_hfill_ + lwidth - width_pos;
                }
 
-               if (pit_->isHfill(pos)) {
+               if (par_.isHfill(pos)) {
                        x_ += 1;
 
-                       int const y0 = yo_ + row_.baseline();
+                       int const y0 = yo_;
                        int const y1 = y0 - defaultRowHeight() / 2;
 
                        pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 
-                       if (hfillExpansion(*pit_, row_, pos)) {
+                       if (hfillExpansion(par_, row_, pos)) {
                                int const y2 = (y0 + y1) / 2;
 
                                if (pos >= body_pos) {
@@ -833,8 +715,8 @@ void RowPainter::paintText()
                        }
                        x_ += 2;
                        ++vpos;
-               } else if (pit_->isSeparator(pos)) {
-                       x_ += singleWidth(pos);
+               } else if (par_.isSeparator(pos)) {
+                       x_ += width_pos;
                        if (pos >= body_pos)
                                x_ += separator_;
                        ++vpos;
@@ -845,7 +727,10 @@ void RowPainter::paintText()
 
        // if we reach the end of a struck out range, paint it
        if (running_strikeout) {
-               int const middle = yo_ + (row_.baseline() + row_.top_of_text()) / 2;
+               // calculate 1/3 height of the buffer's default font
+               int const middle =
+                       yo_ -
+                       font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
                pain_.line(last_strikeout_x, middle, int(x_), middle,
                        LColor::strikeout, Painter::line_solid, Painter::line_thin);
                running_strikeout = false;
@@ -853,42 +738,214 @@ void RowPainter::paintText()
 }
 
 
-int paintPars(BufferView const & bv, LyXText const & text,
-       ParagraphList::iterator pit, int xo, int yo, int y)
+lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
+       int x, int y)
+{
+       boost::crc_32_type crc;
+       for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
+               const unsigned char b[] = { par.getChar(i) };
+               crc.process_bytes(b, 1);
+       }
+       const unsigned char b[] = { x, y, row.width() };
+       crc.process_bytes(b, 3);
+       return crc.checksum();
+}
+
+
+bool CursorOnRow(PainterInfo & pi, pit_type const pit,
+       RowList::const_iterator rit, LyXText const & text)
 {
-       //lyxerr << "  paintRows: pit: " << &*pit << endl;
-       int const y2 = bv.painter().paperHeight();
-       y -= bv.top_y();
+       // Is there a cursor on this row (or inside inset on row)
+       LCursor & cur = pi.base.bv->cursor();
+       for (lyx::size_type d = 0; d < cur.depth(); d++) {
+               CursorSlice const & sl = cur[d];
+               if (sl.text() == &text
+                   && sl.pit() == pit
+                   && sl.pos() >= rit->pos()
+                   && sl.pos() <= rit->endpos())
+                       return true;
+       }
+       return false;
+}
 
-       ParagraphList::iterator end = text.paragraphs().end();
 
-       for ( ; pit != end; ++pit) {
-               RowList::iterator row = pit->rows.begin();
-               RowList::iterator rend = pit->rows.end();
+bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
+       RowList::const_iterator rit, LyXText const & text)
+{
+       // Is there a cursor inside an inset on this row, and is this inset
+       // the only "character" on this row
+       LCursor & cur = pi.base.bv->cursor();
+       if (rit->pos() + 1 != rit->endpos())
+               return false;
+       for (lyx::size_type d = 0; d < cur.depth(); d++) {
+               CursorSlice const & sl = cur[d];
+               if (sl.text() == &text
+                   && sl.pit() == pit
+                   && sl.pos() == rit->pos())
+                       return d < cur.depth() - 1;
+       }
+       return false;
+}
 
-               for ( ; row != rend; ++row) {
-                       RowPainter(bv, text, pit, row, xo, y + yo);
-                       y += row->height();
+
+void paintPar
+       (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
+        bool repaintAll)
+{
+//     lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
+       static NullPainter nop;
+       static PainterInfo nullpi(pi.base.bv, nop);
+       int const ww = pi.base.bv->workHeight();
+
+       Paragraph const & par = text.paragraphs()[pit];
+
+       RowList::const_iterator const rb = par.rows().begin();
+       RowList::const_iterator const re = par.rows().end();
+       theCoords.parPos()[&text][pit] = Point(x, y);
+
+       y -= rb->ascent();
+       lyx::size_type rowno(0);
+       for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
+               y += rit->ascent();
+               // Allow setting of refreshInside for nested insets in
+               // this row only
+               bool tmp = refreshInside;
+
+               // Row signature; has row changed since last paint?
+               lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
+               bool row_has_changed = par.rowSignature()[rowno] != row_sig;
+
+               bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
+               bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
+                       text);
+
+               // If this is the only object on the row, we can make it wide
+               for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
+                       InsetBase const * const in = par.getInset(i);
+                       if (in) {
+                               InsetText const * const t = in->asTextInset();
+                               if (t)
+                                       t->Wide() = in_inset_alone_on_row;
+                       }
                }
-               if (yo + y >= y2)
-                       break;
-       }
 
-       return y;
+               // If selection is on, the current row signature differs
+               // from cache, or cursor is inside an inset _on this row_,
+               // then paint the row
+               if (repaintAll || row_has_changed || cursor_on_row) {
+                       // Add to row signature cache
+                       par.rowSignature()[rowno] = row_sig;
+
+                       bool const inside = (y + rit->descent() >= 0
+                                      && y - rit->ascent() < ww);
+                       RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
+                       // Clear background of this row
+                       // (if paragraph background was not cleared)
+                       if (!repaintAll &&
+                           (!in_inset_alone_on_row || row_has_changed)) {
+                               pi.pain.fillRectangle(x, y - rit->ascent(),
+                                   text.maxwidth_, rit->height(),
+                                   text.backgroundColor());
+                               // If outer row has changed, force nested
+                               // insets to repaint completely
+                               if (row_has_changed)
+                                       refreshInside = true;
+                       }
+
+                       // Instrumentation for testing row cache (see also
+                       // 12 lines lower):
+                       if (text.isMainText())
+                               lyxerr[Debug::PAINTING] << "#";
+                       else
+                               lyxerr[Debug::PAINTING] << "[" <<
+                                   repaintAll << row_has_changed <<
+                                   cursor_on_row << "]";
+                       rp.paintAppendix();
+                       rp.paintDepthBar();
+                       rp.paintChangeBar();
+                       if (rit == rb)
+                               rp.paintFirst();
+                       if (rit + 1 == re)
+                               rp.paintLast();
+                       rp.paintText();
+               }
+               y += rit->descent();
+               // Restore, see above
+               refreshInside = tmp;
+       }
+       lyxerr[Debug::PAINTING] << "." << endl;
 }
 
 } // namespace anon
 
 
-int paintText(BufferView const & bv)
+void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 {
-       ParagraphList::iterator pit;
-       bv.text()->getRowNearY(bv.top_y(), pit);
-       return paintPars(bv, *bv.text(), pit, 0, 0, pit->y);
+       Painter & pain = bv.owner()->workArea()->getPainter();
+       LyXText * const text = bv.text();
+       bool const select = bv.cursor().selection();
+
+       PainterInfo pi(const_cast<BufferView *>(&bv), pain);
+       // Should the whole screen, including insets, be refreshed?
+       bool repaintAll = select || !vi.singlepar;
+
+       if (repaintAll) {
+               // Clear background (if not delegated to rows)
+               pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
+                       text->backgroundColor());
+       }
+       if (select) {
+               text->drawSelection(pi, 0, 0);
+       }
+
+       int yy = vi.y1;
+       // draw contents
+       for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
+               refreshInside = repaintAll;
+               Paragraph const & par = text->getPar(pit);
+               yy += par.ascent();
+               paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
+               yy += par.descent();
+       }
+
+       // Cache one paragraph above and one below
+       // Note MV: this cannot be suppressed even for singlepar.
+       // Try viewing the User Guide Mobius figure
+
+       if (vi.p1 > 0) {
+               text->redoParagraph(vi.p1 - 1);
+               theCoords.parPos()[bv.text()][vi.p1 - 1] =
+                       Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
+       }
+
+       if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
+               text->redoParagraph(vi.p2 + 1);
+               theCoords.parPos()[bv.text()][vi.p2 + 1] =
+                       Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
+       }
+
+       // and grey out above (should not happen later)
+//     lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
+       if (vi.y1 > 0 && !vi.singlepar)
+               pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
+
+       // and possibly grey out below
+//     lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
+       if (vi.y2 < bv.workHeight() && !vi.singlepar)
+               pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 }
 
 
-void paintTextInset(LyXText const & text, PainterInfo & pi, int xo, int yo)
+void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 {
-       paintPars(*pi.base.bv, text, text.paragraphs().begin(), xo, yo, 0);
+//     lyxerr << "  paintTextInset: y: " << y << endl;
+
+       y -= text.getPar(0).ascent();
+       // This flag can not be set from within same inset:
+       bool repaintAll = refreshInside;
+       for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
+               y += text.getPar(pit).ascent();
+               paintPar(pi, text, pit, x, y, repaintAll);
+               y += text.getPar(pit).descent();
+       }
 }