void setGlyphXPositions(bool isRTL)
{
double position = 0;
// logClustersIndex indexes logClusters for the first (or last when
// RTL) codepoint of the current glyph. Each time we advance a glyph,
// we skip over all the codepoints that contributed to the current
// glyph.
unsigned logClustersIndex = isRTL ? m_item.num_glyphs - 1 : 0;
for (int iter = 0; iter < m_item.num_glyphs; ++iter) {
// Glyphs are stored in logical order, but for layout purposes we
// always go left to right.
int i = isRTL ? m_item.num_glyphs - iter - 1 : iter;
m_glyphs16[i] = m_item.glyphs[i];
double offsetX = truncateFixedPointToInteger(m_item.offsets[i].x);
m_xPositions[i] = m_offsetX + position + offsetX;
double advance = truncateFixedPointToInteger(m_item.advances[i]);
// The first half of the conjuction works around the case where
// output glyphs aren't associated with any codepoints by the
// clusters log.
if (logClustersIndex < m_item.item.length
&& isWordBreak(m_item.item.pos + logClustersIndex, isRTL)) {
advance += m_wordSpacingAdjustment;
if (m_padding > 0) {
unsigned toPad = roundf(m_padPerWordBreak + m_padError);
m_padError += m_padPerWordBreak - toPad;
if (m_padding < toPad)
toPad = m_padding;
m_padding -= toPad;
advance += toPad;
}
}
// We would like to add m_letterSpacing after each cluster, but I
// don't know where the cluster information is. This is typically
// fine for Roman languages, but breaks more complex languages
// terribly.
// advance += m_letterSpacing;
if (isRTL) {
while (logClustersIndex > 0 && logClusters()[logClustersIndex] == i)
logClustersIndex--;
} else {
while (logClustersIndex < m_item.item.length && logClusters()[logClustersIndex] == i)
logClustersIndex++;
}
position += advance;
}
m_pixelWidth = position;
m_offsetX += m_pixelWidth;
}
void QTextEngine::shape( int item ) const
{
assert( item < items.size() );
QScriptItem &si = items[item];
if ( si.num_glyphs )
return;
QFont::Script script = (QFont::Script)si.analysis.script;
si.glyph_data_offset = used;
if ( !si.fontEngine )
si.fontEngine = fnt->engineForScript( script );
si.fontEngine->ref();
si.ascent = si.fontEngine->ascent();
si.descent = si.fontEngine->descent();
si.num_glyphs = 0;
if ( si.fontEngine && si.fontEngine != (QFontEngine*)-1 ) {
QShaperItem shaper_item;
shaper_item.script = si.analysis.script;
shaper_item.string = &string;
shaper_item.from = si.position;
shaper_item.length = length(item);
shaper_item.font = si.fontEngine;
shaper_item.num_glyphs = QMAX(int(num_glyphs - used), shaper_item.length);
shaper_item.flags = si.analysis.bidiLevel % 2 ? RightToLeft : 0;
while (1) {
// qDebug(" . num_glyphs=%d, used=%d, item.num_glyphs=%d", num_glyphs, used, shaper_item.num_glyphs);
ensureSpace(shaper_item.num_glyphs);
shaper_item.num_glyphs = num_glyphs - used;
// qDebug(" .. num_glyphs=%d, used=%d, item.num_glyphs=%d", num_glyphs, used, shaper_item.num_glyphs);
shaper_item.glyphs = glyphs(&si);
shaper_item.advances = advances(&si);
shaper_item.offsets = offsets(&si);
shaper_item.attributes = glyphAttributes(&si);
shaper_item.log_clusters = logClusters(&si);
if (scriptEngines[shaper_item.script].shape(&shaper_item))
break;
}
si.num_glyphs = shaper_item.num_glyphs;
}
((QTextEngine *)this)->used += si.num_glyphs;
si.width = 0;
advance_t *advances = this->advances( &si );
advance_t *end = advances + si.num_glyphs;
while ( advances < end )
si.width += *(advances++);
return;
}
void ComplexTextController::setGlyphXPositions(bool isRTL)
{
const double rtlFlip = isRTL ? -1 : 1;
double position = 0;
// logClustersIndex indexes logClusters for the first codepoint of the current glyph.
// Each time we advance a glyph, we skip over all the codepoints that contributed to the current glyph.
int logClustersIndex = 0;
// Iterate through the glyphs in logical order, flipping for RTL where necessary.
// Glyphs are positioned starting from m_offsetX; in RTL mode they go leftwards from there.
for (size_t i = 0; i < m_item.num_glyphs; ++i) {
while (static_cast<unsigned>(logClustersIndex) < m_item.item.length && logClusters()[logClustersIndex] < i)
logClustersIndex++;
// If the current glyph is just after a space, add in the word spacing.
position += determineWordBreakSpacing(logClustersIndex);
m_glyphs16[i] = m_item.glyphs[i];
double offsetX = truncateFixedPointToInteger(m_item.offsets[i].x);
double advance = truncateFixedPointToInteger(m_item.advances[i]);
if (isRTL)
offsetX -= advance;
m_xPositions[i] = m_offsetX + (position * rtlFlip) + offsetX;
if (m_currentFontData->isZeroWidthSpaceGlyph(m_glyphs16[i]))
continue;
// At the end of each cluster, add in the letter spacing.
if (i + 1 == m_item.num_glyphs || m_item.attributes[i + 1].clusterStart)
position += m_letterSpacing;
position += advance;
}
m_pixelWidth = std::max(position, 0.0);
m_offsetX += m_pixelWidth * rtlFlip;
}
void QTextEngine::shapeTextMac(int item) const
{
QScriptItem &si = layoutData->items[item];
si.glyph_data_offset = layoutData->used;
QFontEngine *font = fontEngine(si, &si.ascent, &si.descent, &si.leading);
if (font->type() != QFontEngine::Multi) {
shapeTextWithHarfbuzz(item);
return;
}
#ifndef QT_MAC_USE_COCOA
QFontEngineMacMulti *fe = static_cast<QFontEngineMacMulti *>(font);
#else
QCoreTextFontEngineMulti *fe = static_cast<QCoreTextFontEngineMulti *>(font);
#endif
QTextEngine::ShaperFlags flags;
if (si.analysis.bidiLevel % 2)
flags |= RightToLeft;
if (option.useDesignMetrics())
flags |= DesignMetrics;
attributes(); // pre-initialize char attributes
const int len = length(item);
int num_glyphs = length(item);
const QChar *str = layoutData->string.unicode() + si.position;
ushort upperCased[256];
if (si.analysis.flags == QScriptAnalysis::SmallCaps || si.analysis.flags == QScriptAnalysis::Uppercase
|| si.analysis.flags == QScriptAnalysis::Lowercase) {
ushort *uc = upperCased;
if (len > 256)
uc = new ushort[len];
for (int i = 0; i < len; ++i) {
if(si.analysis.flags == QScriptAnalysis::Lowercase)
uc[i] = str[i].toLower().unicode();
else
uc[i] = str[i].toUpper().unicode();
}
str = reinterpret_cast<const QChar *>(uc);
}
ensureSpace(num_glyphs);
num_glyphs = layoutData->glyphLayout.numGlyphs - layoutData->used;
QGlyphLayout g = availableGlyphs(&si);
g.numGlyphs = num_glyphs;
unsigned short *log_clusters = logClusters(&si);
bool stringToCMapFailed = false;
if (!fe->stringToCMap(str, len, &g, &num_glyphs, flags, log_clusters, attributes())) {
ensureSpace(num_glyphs);
stringToCMapFailed = fe->stringToCMap(str, len, &g, &num_glyphs, flags, log_clusters,
attributes());
}
if (!stringToCMapFailed) {
heuristicSetGlyphAttributes(str, len, &g, log_clusters, num_glyphs);
si.num_glyphs = num_glyphs;
layoutData->used += si.num_glyphs;
QGlyphLayout g = shapedGlyphs(&si);
if (si.analysis.script == QUnicodeTables::Arabic) {
QVarLengthArray<QArabicProperties> props(len + 2);
QArabicProperties *properties = props.data();
int f = si.position;
int l = len;
if (f > 0) {
--f;
++l;
++properties;
}
if (f + l < layoutData->string.length()) {
++l;
}
qt_getArabicProperties((const unsigned short *)(layoutData->string.unicode()+f), l, props.data());
unsigned short *log_clusters = logClusters(&si);
for (int i = 0; i < len; ++i) {
int gpos = log_clusters[i];
g.attributes[gpos].justification = properties[i].justification;
}
}
}
const ushort *uc = reinterpret_cast<const ushort *>(str);
if ((si.analysis.flags == QScriptAnalysis::SmallCaps || si.analysis.flags == QScriptAnalysis::Uppercase
|| si.analysis.flags == QScriptAnalysis::Lowercase)
&& uc != upperCased)
delete [] uc;
}