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-rw-r--r--src/gui/text/qtextengine.cpp66
-rw-r--r--src/gui/text/qtextengine_p.h2
-rw-r--r--src/gui/text/qtextlayout.cpp16
-rw-r--r--tests/auto/qtextlayout/tst_qtextlayout.cpp25
4 files changed, 102 insertions, 7 deletions
diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp
index ff27bc6..0df543b 100644
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@@ -2825,6 +2825,72 @@ QFixed QTextEngine::offsetInLigature(const QScriptItem *si, int pos, int max, in
return 0;
}
+// 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)
+{
+ 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;
+ int pos = si->position + clusterStart + closestItem;
+ // Jump to the next charStop
+ while (!attrs[pos].charStop && pos < end)
+ pos++;
+ return pos;
+ }
+ return si->position + end;
+}
+
int QTextEngine::previousLogicalPosition(int oldPos) const
{
const HB_CharAttributes *attrs = attributes();
diff --git a/src/gui/text/qtextengine_p.h b/src/gui/text/qtextengine_p.h
index e06ca1c..8e1d796 100644
--- a/src/gui/text/qtextengine_p.h
+++ b/src/gui/text/qtextengine_p.h
@@ -620,6 +620,7 @@ public:
QFixed leadingSpaceWidth(const QScriptLine &line);
QFixed offsetInLigature(const QScriptItem *si, int pos, int max, int glyph_pos);
+ int positionInLigature(const QScriptItem *si, int end, QFixed x, QFixed edge, int glyph_pos);
int previousLogicalPosition(int oldPos) const;
int nextLogicalPosition(int oldPos) const;
int lineNumberForTextPosition(int pos);
@@ -642,6 +643,7 @@ private:
void resolveAdditionalFormats() const;
int endOfLine(int lineNum);
int beginningOfLine(int lineNum);
+ 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 9501c0b..20edb87 100644
--- a/src/gui/text/qtextlayout.cpp
+++ b/src/gui/text/qtextlayout.cpp
@@ -2691,6 +2691,7 @@ 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) {
@@ -2701,6 +2702,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const
if (pos < x)
break;
glyph_pos = gs;
+ edge = pos;
break;
}
pos -= glyphs.effectiveAdvance(gs);
@@ -2713,6 +2715,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const
if (pos > x)
break;
glyph_pos = gs;
+ edge = pos;
}
pos += glyphs.effectiveAdvance(gs);
++gs;
@@ -2726,6 +2729,7 @@ 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);
@@ -2735,6 +2739,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const
while (ge >= gs) {
if (glyphs.attributes[ge].clusterStart && qAbs(x-pos) < dist) {
glyph_pos = ge;
+ edge = pos;
dist = qAbs(x-pos);
}
pos += glyphs.effectiveAdvance(ge);
@@ -2746,6 +2751,7 @@ 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);
@@ -2757,6 +2763,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const
pos += glyphs.effectiveAdvance(gs);
if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) {
glyph_pos = gs;
+ edge = pos;
dist = qAbs(x-pos);
}
++gs;
@@ -2773,16 +2780,11 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const
if (rtl && nchars > 0)
return insertionPoints[lastLine ? nchars : nchars - 1];
}
- return si.position + end;
+ return eng->positionInLigature(&si, end, x, pos, -1);
}
}
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);
}
}
// right of last item
diff --git a/tests/auto/qtextlayout/tst_qtextlayout.cpp b/tests/auto/qtextlayout/tst_qtextlayout.cpp
index b5712fb..e68a65e 100644
--- a/tests/auto/qtextlayout/tst_qtextlayout.cpp
+++ b/tests/auto/qtextlayout/tst_qtextlayout.cpp
@@ -128,6 +128,7 @@ private slots:
void textWidthWithStackedTextEngine();
void textWidthWithLineSeparator();
void cursorInLigatureWithMultipleLines();
+ void xToCursorForLigatures();
private:
QFont testFont;
@@ -1477,5 +1478,29 @@ void tst_QTextLayout::cursorInLigatureWithMultipleLines()
QVERIFY(line.cursorToX(0) != line.cursorToX(1));
}
+void tst_QTextLayout::xToCursorForLigatures()
+{
+#if !defined(Q_WS_MAC)
+ QSKIP("This test can not be run on Mac", SkipAll);
+#endif
+ QTextLayout layout("fi", QFont("Times", 20));
+ layout.beginLayout();
+ QTextLine line = layout.createLine();
+ layout.endLayout();
+
+ QVERIFY(line.xToCursor(0) != line.xToCursor(line.naturalTextWidth() / 2));
+
+ // U+0061 U+0308
+ QTextLayout layout2(QString::fromUtf8("\x61\xCC\x88"), QFont("Times", 20));
+
+ layout2.beginLayout();
+ line = layout2.createLine();
+ layout2.endLayout();
+
+ qreal width = line.naturalTextWidth();
+ QVERIFY(line.xToCursor(0) == line.xToCursor(width / 2) ||
+ line.xToCursor(width) == line.xToCursor(width / 2));
+}
+
QTEST_MAIN(tst_QTextLayout)
#include "tst_qtextlayout.moc"
generated by cgit v0.12 at 2025-03-13 02:46:44 (GMT)