void computeNormalizedSpaces(const TextRun& run, bool mirror, String& normalizedSpacesStringCache)
{
if (normalizedSpacesStringCache.length() == static_cast<unsigned>(run.charactersLength()))
return;
if (run.is8Bit())
normalizedSpacesStringCache = Font::normalizeSpaces(run.characters8(), run.charactersLength());
else
normalizedSpacesStringCache = Font::normalizeSpaces(run.characters16(), run.charactersLength());
if (mirror)
normalizedSpacesStringCache = createStringWithMirroredCharacters(normalizedSpacesStringCache);
}
void LayoutSVGInlineText::updateMetricsList(bool& lastCharacterWasWhiteSpace)
{
m_metrics.clear();
if (!textLength())
return;
TextRun run = constructTextRun(*this, 0, textLength(), styleRef().direction());
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
bool bidiOverride = isOverride(styleRef().unicodeBidi());
BidiStatus status(LTR, bidiOverride);
if (run.is8Bit() || bidiOverride) {
WTF::Unicode::CharDirection direction = WTF::Unicode::LeftToRight;
// If BiDi override is in effect, use the specified direction.
if (bidiOverride && !styleRef().isLeftToRightDirection())
direction = WTF::Unicode::RightToLeft;
bidiRuns.addRun(new BidiCharacterRun(0, run.charactersLength(), status.context.get(), direction));
} else {
status.last = status.lastStrong = WTF::Unicode::OtherNeutral;
bidiResolver.setStatus(status);
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
const bool hardLineBreak = false;
const bool reorderRuns = false;
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()), NoVisualOverride, hardLineBreak, reorderRuns);
}
for (const BidiCharacterRun* bidiRun = bidiRuns.firstRun(); bidiRun; bidiRun = bidiRun->next()) {
TextRun subRun = constructTextRun(*this, bidiRun->start(), bidiRun->stop() - bidiRun->start(),
bidiRun->direction());
addMetricsFromRun(subRun, lastCharacterWasWhiteSpace);
}
bidiResolver.runs().deleteRuns();
}
static float textWidth(const RenderText& text, unsigned from, unsigned length, float xPosition, const RenderStyle& style)
{
if (style.font().isFixedPitch() || (!from && length == text.textLength()))
return text.width(from, length, style.font(), xPosition, nullptr, nullptr);
// FIXME: Add templated UChar/LChar paths.
TextRun run = text.is8Bit() ? TextRun(text.characters8() + from, length) : TextRun(text.characters16() + from, length);
run.setCharactersLength(text.textLength() - from);
ASSERT(run.charactersLength() >= run.length());
run.setXPos(xPosition);
return style.font().width(run);
}
float ShapeResult::fillGlyphBufferForTextEmphasisRun(GlyphBuffer* glyphBuffer,
const RunInfo* run, const TextRun& textRun, const GlyphData* emphasisData,
float initialAdvance, unsigned from, unsigned to, unsigned runOffset)
{
if (!run)
return 0;
unsigned graphemesInCluster = 1;
float clusterAdvance = 0;
FloatPoint glyphCenter = emphasisData->fontData->
boundsForGlyph(emphasisData->glyph).center();
TextDirection direction = textRun.direction();
// A "cluster" in this context means a cluster as it is used by HarfBuzz:
// The minimal group of characters and corresponding glyphs, that cannot be broken
// down further from a text shaping point of view.
// A cluster can contain multiple glyphs and grapheme clusters, with mutually
// overlapping boundaries. Below we count grapheme clusters per HarfBuzz clusters,
// then linearly split the sum of corresponding glyph advances by the number of
// grapheme clusters in order to find positions for emphasis mark drawing.
uint16_t clusterStart = direction == RTL
? run->m_startIndex + run->m_numCharacters + runOffset
: run->glyphToCharacterIndex(0) + runOffset;
float advanceSoFar = initialAdvance;
unsigned numGlyphs = run->m_numGlyphs;
for (unsigned i = 0; i < numGlyphs; ++i) {
const HarfBuzzRunGlyphData& glyphData = run->m_glyphData[i];
uint16_t currentCharacterIndex = run->m_startIndex + glyphData.characterIndex + runOffset;
bool isRunEnd = (i + 1 == numGlyphs);
bool isClusterEnd = isRunEnd || (run->glyphToCharacterIndex(i + 1) + runOffset != currentCharacterIndex);
if ((direction == RTL && currentCharacterIndex >= to) || (direction != RTL && currentCharacterIndex < from)) {
advanceSoFar += glyphData.advance;
direction == RTL ? --clusterStart : ++clusterStart;
continue;
}
clusterAdvance += glyphData.advance;
if (textRun.is8Bit()) {
float glyphAdvanceX = glyphData.advance;
if (Character::canReceiveTextEmphasis(textRun[currentCharacterIndex])) {
addEmphasisMark(glyphBuffer, emphasisData, glyphCenter, advanceSoFar + glyphAdvanceX / 2);
}
advanceSoFar += glyphAdvanceX;
} else if (isClusterEnd) {
uint16_t clusterEnd;
if (direction == RTL)
clusterEnd = currentCharacterIndex;
else
clusterEnd = isRunEnd ? run->m_startIndex + run->m_numCharacters + runOffset : run->glyphToCharacterIndex(i + 1) + runOffset;
graphemesInCluster = countGraphemesInCluster(textRun.characters16(), textRun.charactersLength(), clusterStart, clusterEnd);
if (!graphemesInCluster || !clusterAdvance)
continue;
float glyphAdvanceX = clusterAdvance / graphemesInCluster;
for (unsigned j = 0; j < graphemesInCluster; ++j) {
// Do not put emphasis marks on space, separator, and control characters.
if (Character::canReceiveTextEmphasis(textRun[currentCharacterIndex]))
addEmphasisMark(glyphBuffer, emphasisData, glyphCenter, advanceSoFar + glyphAdvanceX / 2);
advanceSoFar += glyphAdvanceX;
}
clusterStart = clusterEnd;
clusterAdvance = 0;
}
}
return advanceSoFar - initialAdvance;
}