diff options
Diffstat (limited to 'src/gui')
| -rw-r--r-- | src/gui/text/qtextengine.cpp | 69 | ||||
| -rw-r--r-- | src/gui/text/qtextengine_p.h | 3 | ||||
| -rw-r--r-- | src/gui/text/qtextlayout.cpp | 16 |
3 files changed, 81 insertions, 7 deletions
diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp index 806779a..9271f34 100644 --- a/src/gui/text/qtextengine.cpp +++ b/src/gui/text/qtextengine.cpp @@ -2697,6 +2697,75 @@ QFixed QTextEngine::leadingSpaceWidth(const QScriptLine &line) return width(line.from + pos, line.length - pos); } +// Scan in logClusters[from..to-1] for glyph_pos +int QTextEngine::getClusterLength(unsigned short *logClusters, + const HB_CharAttributes *attributes, + int from, int to, int glyph_pos, int *start) +{ + int clusterLength = 0; + for (int i = from; i < to; i++) { + if (logClusters[i] == glyph_pos && attributes[i].charStop) { + if (*start < 0) + *start = i; + clusterLength++; + } + else if (clusterLength) + break; + } + return clusterLength; +} + +int QTextEngine::positionInLigature(const QScriptItem *si, int end, + QFixed x, QFixed edge, int glyph_pos, + bool cursorOnCharacter) +{ + unsigned short *logClusters = this->logClusters(si); + int clusterStart = -1; + int clusterLength = 0; + + if (si->analysis.script != QUnicodeTables::Common && + si->analysis.script != QUnicodeTables::Greek) { + if (glyph_pos == -1) + return si->position + end; + else { + int i; + for (i = 0; i < end; i++) + if (logClusters[i] == glyph_pos) + break; + return si->position + i; + } + } + + if (glyph_pos == -1 && end > 0) + glyph_pos = logClusters[end - 1]; + else { + if (x <= edge) + glyph_pos--; + } + + const HB_CharAttributes *attrs = attributes(); + clusterLength = getClusterLength(logClusters, attrs, 0, end, glyph_pos, &clusterStart); + + if (clusterLength) { + const QGlyphLayout &glyphs = shapedGlyphs(si); + QFixed glyphWidth = glyphs.effectiveAdvance(glyph_pos); + // the approximate width of each individual element of the ligature + QFixed perItemWidth = glyphWidth / clusterLength; + QFixed left = x > edge ? edge : edge - glyphWidth; + int n = ((x - left) / perItemWidth).floor().toInt(); + QFixed dist = x - left - n * perItemWidth; + int closestItem = dist > (perItemWidth / 2) ? n + 1 : n; + if (cursorOnCharacter && closestItem > 0) + closestItem--; + int pos = si->position + clusterStart + closestItem; + // Jump to the next charStop + while (!attrs[pos].charStop && pos < end) + pos++; + return pos; + } + return si->position + end; +} + QStackTextEngine::QStackTextEngine(const QString &string, const QFont &f) : QTextEngine(string, f), _layoutData(string, _memory, MemSize) diff --git a/src/gui/text/qtextengine_p.h b/src/gui/text/qtextengine_p.h index 5e33f21..09610ff 100644 --- a/src/gui/text/qtextengine_p.h +++ b/src/gui/text/qtextengine_p.h @@ -594,6 +594,8 @@ public: void shapeLine(const QScriptLine &line); QFixed leadingSpaceWidth(const QScriptLine &line); + int positionInLigature(const QScriptItem *si, int end, QFixed x, QFixed edge, int glyph_pos, bool cursorOnCharacter); + private: void setBoundary(int strPos) const; void addRequiredBoundaries() const; @@ -608,6 +610,7 @@ private: void splitItem(int item, int pos) const; void resolveAdditionalFormats() const; + int getClusterLength(unsigned short *logClusters, const HB_CharAttributes *attributes, int from, int to, int glyph_pos, int *start); }; class QStackTextEngine : public QTextEngine { diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp index de4ca4f..4b3c9e7 100644 --- a/src/gui/text/qtextlayout.cpp +++ b/src/gui/text/qtextlayout.cpp @@ -2622,6 +2622,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const } int glyph_pos = -1; + QFixed edge; // has to be inside run if (cpos == QTextLine::CursorOnCharacter) { if (si.analysis.bidiLevel % 2) { @@ -2632,6 +2633,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const if (pos < x) break; glyph_pos = gs; + edge = pos; break; } pos -= glyphs.effectiveAdvance(gs); @@ -2644,6 +2646,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const if (pos > x) break; glyph_pos = gs; + edge = pos; } pos += glyphs.effectiveAdvance(gs); ++gs; @@ -2656,6 +2659,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const while (gs <= ge) { if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) { glyph_pos = gs; + edge = pos; dist = qAbs(x-pos); } pos -= glyphs.effectiveAdvance(gs); @@ -2665,6 +2669,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const while (gs <= ge) { if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) { glyph_pos = gs; + edge = pos; dist = qAbs(x-pos); } pos += glyphs.effectiveAdvance(gs); @@ -2672,15 +2677,12 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const } } if (qAbs(x-pos) < dist) - return si.position + end; + return eng->positionInLigature(&si, end, x, pos, -1, + cpos == QTextLine::CursorOnCharacter); } Q_ASSERT(glyph_pos != -1); - int j; - for (j = 0; j < eng->length(item); ++j) - if (logClusters[j] == glyph_pos) - break; -// qDebug("at pos %d (in run: %d)", si.position + j, j); - return si.position + j; + return eng->positionInLigature(&si, end, x, edge, glyph_pos, + cpos == QTextLine::CursorOnCharacter); } } // right of last item |