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-rw-r--r--src/gui/text/qtextlayout.cpp122
1 files changed, 82 insertions, 40 deletions
diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp
index af91603..204effa 100644
--- a/src/gui/text/qtextlayout.cpp
+++ b/src/gui/text/qtextlayout.cpp
@@ -1644,28 +1644,67 @@ namespace {
struct LineBreakHelper
{
- LineBreakHelper() : glyphCount(0), maxGlyphs(0), manualWrap(false) {}
+ LineBreakHelper()
+ : glyphCount(0), maxGlyphs(0), currentPosition(0), fontEngine(0), logClusters(0),
+ manualWrap(false)
+ {
+ }
+
QScriptLine tmpData;
QScriptLine spaceData;
+ QGlyphLayout glyphs;
+
int glyphCount;
int maxGlyphs;
+ int currentPosition;
QFixed minw;
QFixed softHyphenWidth;
QFixed rightBearing;
+ QFixed minimumRightBearing;
+
+ QFontEngine *fontEngine;
+ const unsigned short *logClusters;
bool manualWrap;
bool checkFullOtherwiseExtend(QScriptLine &line);
+
+ QFixed calculateNewWidth(const QScriptLine &line) const {
+ return line.textWidth + tmpData.textWidth + spaceData.textWidth + softHyphenWidth
+ - qMin(rightBearing, QFixed());
+ }
+
+ inline glyph_t currentGlyph() const
+ {
+ Q_ASSERT(currentPosition > 0);
+ return glyphs.glyphs[logClusters[currentPosition - 1]];
+ }
+
+ inline void adjustRightBearing()
+ {
+ if (currentPosition <= 0)
+ return;
+
+ glyph_metrics_t gi = fontEngine->boundingBox(currentGlyph());
+ if (gi.isValid())
+ rightBearing = qMin(QFixed(), gi.xoff - gi.x - gi.width);
+ }
+
+ inline void resetRightBearing()
+ {
+ rightBearing = QFixed(1); // Any positive number is defined as invalid since only
+ // negative right bearings are interesting to us.
+ }
};
inline bool LineBreakHelper::checkFullOtherwiseExtend(QScriptLine &line)
{
LB_DEBUG("possible break width %f, spacew=%f", tmpData.textWidth.toReal(), spaceData.textWidth.toReal());
- QFixed newWidth = line.textWidth + tmpData.textWidth + spaceData.textWidth + softHyphenWidth + rightBearing;
+ QFixed newWidth = calculateNewWidth(line);
if (line.length && !manualWrap && (newWidth > line.width || glyphCount > maxGlyphs))
return true;
@@ -1741,13 +1780,12 @@ void QTextLine::layout_helper(int maxGlyphs)
Qt::Alignment alignment = eng->option.alignment();
const HB_CharAttributes *attributes = eng->attributes();
- int pos = line.from;
+ lbh.currentPosition = line.from;
int end = 0;
- QGlyphLayout glyphs;
- const unsigned short *logClusters = eng->layoutData->logClustersPtr;
+ lbh.logClusters = eng->layoutData->logClustersPtr;
while (newItem < eng->layoutData->items.size()) {
- lbh.rightBearing = 0;
+ lbh.resetRightBearing();
lbh.softHyphenWidth = 0;
if (newItem != item) {
item = newItem;
@@ -1755,13 +1793,19 @@ void QTextLine::layout_helper(int maxGlyphs)
if (!current.num_glyphs) {
eng->shape(item);
attributes = eng->attributes();
- logClusters = eng->layoutData->logClustersPtr;
+ lbh.logClusters = eng->layoutData->logClustersPtr;
}
- pos = qMax(line.from, current.position);
+ lbh.currentPosition = qMax(line.from, current.position);
end = current.position + eng->length(item);
- glyphs = eng->shapedGlyphs(&current);
+ lbh.glyphs = eng->shapedGlyphs(&current);
}
const QScriptItem &current = eng->layoutData->items[item];
+ QFontEngine *fontEngine = eng->fontEngine(current);
+ if (lbh.fontEngine != fontEngine) {
+ lbh.fontEngine = fontEngine;
+ lbh.minimumRightBearing = qMin(QFixed(),
+ QFixed::fromReal(fontEngine->minRightBearing()));
+ }
lbh.tmpData.leading = qMax(lbh.tmpData.leading + lbh.tmpData.ascent,
current.leading + current.ascent) - qMax(lbh.tmpData.ascent,
@@ -1791,8 +1835,8 @@ void QTextLine::layout_helper(int maxGlyphs)
if (!line.length && !lbh.tmpData.length)
line.setDefaultHeight(eng);
if (eng->option.flags() & QTextOption::ShowLineAndParagraphSeparators) {
- addNextCluster(pos, end, lbh.tmpData, lbh.glyphCount,
- current, logClusters, glyphs);
+ addNextCluster(lbh.currentPosition, end, lbh.tmpData, lbh.glyphCount,
+ current, lbh.logClusters, lbh.glyphs);
} else {
lbh.tmpData.length++;
}
@@ -1811,10 +1855,10 @@ void QTextLine::layout_helper(int maxGlyphs)
++lbh.glyphCount;
if (lbh.checkFullOtherwiseExtend(line))
goto found;
- } else if (attributes[pos].whiteSpace) {
- while (pos < end && attributes[pos].whiteSpace)
- addNextCluster(pos, end, lbh.spaceData, lbh.glyphCount,
- current, logClusters, glyphs);
+ } else if (attributes[lbh.currentPosition].whiteSpace) {
+ while (lbh.currentPosition < end && attributes[lbh.currentPosition].whiteSpace)
+ addNextCluster(lbh.currentPosition, end, lbh.spaceData, lbh.glyphCount,
+ current, lbh.logClusters, lbh.glyphs);
if (!lbh.manualWrap && lbh.spaceData.textWidth > line.width) {
lbh.spaceData.textWidth = line.width; // ignore spaces that fall out of the line.
@@ -1823,19 +1867,19 @@ void QTextLine::layout_helper(int maxGlyphs)
} else {
bool sb_or_ws = false;
do {
- addNextCluster(pos, end, lbh.tmpData, lbh.glyphCount,
- current, logClusters, glyphs);
+ addNextCluster(lbh.currentPosition, end, lbh.tmpData, lbh.glyphCount,
+ current, lbh.logClusters, lbh.glyphs);
- if (attributes[pos].whiteSpace || attributes[pos-1].lineBreakType != HB_NoBreak) {
+ if (attributes[lbh.currentPosition].whiteSpace || attributes[lbh.currentPosition-1].lineBreakType != HB_NoBreak) {
sb_or_ws = true;
break;
- } else if (breakany && attributes[pos].charStop) {
+ } else if (breakany && attributes[lbh.currentPosition].charStop) {
break;
}
- } while (pos < end);
+ } while (lbh.currentPosition < end);
lbh.minw = qMax(lbh.tmpData.textWidth, lbh.minw);
- if (pos && attributes[pos - 1].lineBreakType == HB_SoftHyphen) {
+ if (lbh.currentPosition && attributes[lbh.currentPosition - 1].lineBreakType == HB_SoftHyphen) {
// if we are splitting up a word because of
// a soft hyphen then we ...
//
@@ -1853,41 +1897,39 @@ void QTextLine::layout_helper(int maxGlyphs)
// and thus become invisible again.
//
if (line.length)
- lbh.softHyphenWidth = glyphs.advances_x[logClusters[pos - 1]];
+ lbh.softHyphenWidth = lbh.glyphs.advances_x[lbh.logClusters[lbh.currentPosition - 1]];
else if (breakany)
- lbh.tmpData.textWidth += glyphs.advances_x[logClusters[pos - 1]];
+ lbh.tmpData.textWidth += lbh.glyphs.advances_x[lbh.logClusters[lbh.currentPosition - 1]];
}
// The actual width of the text needs to take the right bearing into account. The
// right bearing is left-ward, which means that if the rightmost pixel is to the right
// of the advance of the glyph, the bearing will be negative. We flip the sign
// for the code to be more readable. Logic borrowed from qfontmetrics.cpp.
- if (pos) {
- QFontEngine *fontEngine = eng->fontEngine(current);
- glyph_t glyph = glyphs.glyphs[logClusters[pos - 1]];
- glyph_metrics_t gi = fontEngine->boundingBox(glyph);
- if (gi.isValid())
- lbh.rightBearing = qMax(QFixed(), -(gi.xoff - gi.x - gi.width));
- }
+ // We ignore the right bearing if the minimum negative bearing is too little to
+ // expand the text beyond the edge.
+ if (sb_or_ws|breakany) {
+ if (lbh.calculateNewWidth(line) + lbh.minimumRightBearing > line.width)
+ lbh.adjustRightBearing();
+ if (lbh.checkFullOtherwiseExtend(line)) {
+ if (!breakany) {
+ line.textWidth += lbh.softHyphenWidth;
+ }
- if ((sb_or_ws|breakany) && lbh.checkFullOtherwiseExtend(line)) {
- if (!breakany) {
- line.textWidth += lbh.softHyphenWidth;
+ goto found;
}
-
- line.textWidth += lbh.rightBearing;
-
- goto found;
}
}
- if (pos == end)
+ if (lbh.currentPosition == end)
newItem = item + 1;
}
LB_DEBUG("reached end of line");
lbh.checkFullOtherwiseExtend(line);
- line.textWidth += lbh.rightBearing;
-
found:
+ if (lbh.rightBearing > 0) // If right bearing has not yet been adjusted
+ lbh.adjustRightBearing();
+ line.textWidth -= qMin(QFixed(), lbh.rightBearing);
+
if (line.length == 0) {
LB_DEBUG("no break available in line, adding temp: length %d, width %f, space: length %d, width %f",
lbh.tmpData.length, lbh.tmpData.textWidth.toReal(),
generated by cgit v0.12 at 2024-11-15 19:20:49 (GMT)