SVGTextMetrics SVGTextMetricsCalculator::computeMetricsForCharacter(unsigned textPosition)
{
if (m_bidiRun) {
if (textPosition >= static_cast<unsigned>(m_bidiRun->stop())) {
m_bidiRun = m_bidiRun->next();
// New BiDi run means new reference position for measurements, so reset |m_totalWidth|.
m_totalWidth = 0;
}
ASSERT(m_bidiRun);
ASSERT(static_cast<int>(textPosition) < m_bidiRun->stop());
m_textDirection = m_bidiRun->direction();
}
unsigned metricsLength = characterStartsSurrogatePair(textPosition) ? 2 : 1;
SVGTextMetrics metrics = SVGTextMetrics::measureCharacterRange(m_text, textPosition, metricsLength, m_textDirection);
ASSERT(metrics.length() == metricsLength);
unsigned startPosition = m_bidiRun ? m_bidiRun->start() : 0;
ASSERT(startPosition <= textPosition);
SVGTextMetrics complexStartToCurrentMetrics = SVGTextMetrics::measureCharacterRange(m_text, startPosition, textPosition - startPosition + metricsLength, m_textDirection);
// Frequent case for Arabic text: when measuring a single character the arabic isolated form is taken
// when laying out the glyph "in context" (with it's surrounding characters) it changes due to shaping.
// So whenever currentWidth != currentMetrics.width(), we are processing a text run whose length is
// not equal to the sum of the individual lengths of the glyphs, when measuring them isolated.
float currentWidth = complexStartToCurrentMetrics.width() - m_totalWidth;
if (currentWidth != metrics.width())
metrics.setWidth(currentWidth);
m_totalWidth = complexStartToCurrentMetrics.width();
return metrics;
}
void GraphicsContext::drawBidiText(const Font& font, const TextRun& run, const FloatPoint& point)
{
if (paintingDisabled())
return;
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
bidiResolver.setPosition(TextRunIterator(&run, 0));
// FIXME: This ownership should be reversed. We should pass BidiRunList
// to BidiResolver in createBidiRunsForLine.
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));
if (!bidiRuns.runCount())
return;
FloatPoint currPoint = point;
BidiCharacterRun* bidiRun = bidiRuns.firstRun();
while (bidiRun) {
TextRun subrun = run;
subrun.setText(run.data(bidiRun->start()), bidiRun->stop() - bidiRun->start());
bool isRTL = bidiRun->level() % 2;
subrun.setDirection(isRTL ? RTL : LTR);
subrun.setDirectionalOverride(bidiRun->dirOverride(false));
font.drawText(this, subrun, currPoint);
bidiRun = bidiRun->next();
// FIXME: Have Font::drawText return the width of what it drew so that we don't have to re-measure here.
if (bidiRun)
currPoint.move(font.width(subrun), 0);
}
bidiRuns.deleteRuns();
}
void GraphicsContext::drawBidiText(const Font& font, const TextRun& run, const FloatPoint& point)
{
if (paintingDisabled())
return;
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
WTF::Unicode::Direction paragraphDirection = run.ltr() ? WTF::Unicode::LeftToRight : WTF::Unicode::RightToLeft;
bidiResolver.setStatus(BidiStatus(paragraphDirection, paragraphDirection, paragraphDirection, new BidiContext(run.ltr() ? 0 : 1, paragraphDirection, run.directionalOverride())));
bidiResolver.setPosition(TextRunIterator(&run, 0));
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));
if (!bidiResolver.runCount())
return;
FloatPoint currPoint = point;
BidiCharacterRun* bidiRun = bidiResolver.firstRun();
while (bidiRun) {
TextRun subrun = run;
subrun.setText(run.data(bidiRun->start()), bidiRun->stop() - bidiRun->start());
subrun.setRTL(bidiRun->level() % 2);
subrun.setDirectionalOverride(bidiRun->dirOverride(false));
font.drawText(this, subrun, currPoint);
bidiRun = bidiRun->next();
// FIXME: Have Font::drawText return the width of what it drew so that we don't have to re-measure here.
if (bidiRun)
currPoint.move(font.floatWidth(subrun), 0.f);
}
bidiResolver.deleteRuns();
}
void GraphicsContext::drawBidiText(const FontCascade& font, const TextRun& run, const FloatPoint& point, FontCascade::CustomFontNotReadyAction customFontNotReadyAction)
{
if (paintingDisabled())
return;
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
// FIXME: This ownership should be reversed. We should pass BidiRunList
// to BidiResolver in createBidiRunsForLine.
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));
if (!bidiRuns.runCount())
return;
FloatPoint currPoint = point;
BidiCharacterRun* bidiRun = bidiRuns.firstRun();
while (bidiRun) {
TextRun subrun = run.subRun(bidiRun->start(), bidiRun->stop() - bidiRun->start());
bool isRTL = bidiRun->level() % 2;
subrun.setDirection(isRTL ? RTL : LTR);
subrun.setDirectionalOverride(bidiRun->dirOverride(false));
float width = font.drawText(*this, subrun, currPoint, 0, -1, customFontNotReadyAction);
currPoint.move(width, 0);
bidiRun = bidiRun->next();
}
bidiRuns.deleteRuns();
}
// ReverseBidi is a trimmed-down version of GraphicsContext::drawBidiText()
void ReverseBidi(UChar* chars, int len) {
using namespace WTF::Unicode;
WTF::Vector<UChar> result;
result.reserveCapacity(len);
TextRun run(chars, len);
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
bidiResolver.setStatus(BidiStatus(LeftToRight, LeftToRight, LeftToRight,
BidiContext::create(0, LeftToRight, false)));
bidiResolver.setPosition(TextRunIterator(&run, 0));
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, len));
if (!bidiRuns.runCount())
return;
BidiCharacterRun* bidiRun = bidiRuns.firstRun();
while (bidiRun) {
int bidiStart = bidiRun->start();
int bidiStop = bidiRun->stop();
int size = result.size();
int bidiCount = bidiStop - bidiStart;
result.append(chars + bidiStart, bidiCount);
if (bidiRun->level() % 2) {
UChar* start = &result[size];
UChar* end = start + bidiCount;
// reverse the order of any RTL substrings
while (start < end) {
UChar temp = *start;
*start++ = *--end;
*end = temp;
}
start = &result[size];
end = start + bidiCount - 1;
// if the RTL substring had a surrogate pair, restore its order
while (start < end) {
UChar trail = *start++;
if (!U16_IS_SURROGATE(trail))
continue;
start[-1] = *start; // lead
*start++ = trail;
}
}
bidiRun = bidiRun->next();
}
bidiRuns.deleteRuns();
memcpy(chars, &result[0], len * sizeof(UChar));
}
SVGTextMetrics SVGTextMetricsCalculator::computeMetricsForCharacter(unsigned textPosition)
{
if (m_bidiRun) {
if (textPosition >= static_cast<unsigned>(m_bidiRun->stop())) {
m_bidiRun = m_bidiRun->next();
// New BiDi run means new reference position for measurements, so reset |m_totalWidth|.
m_totalWidth = 0;
}
ASSERT(m_bidiRun);
ASSERT(static_cast<int>(textPosition) < m_bidiRun->stop());
m_textDirection = m_bidiRun->direction();
}
if (m_isComplexText)
return computeMetricsForCharacterComplex(textPosition);
return computeMetricsForCharacterSimple(textPosition);
}
SVGTextMetrics SVGTextMetricsCalculator::computeMetricsForCharacterComplex(unsigned textPosition)
{
unsigned metricsLength = characterStartsSurrogatePair(textPosition) ? 2 : 1;
SVGTextMetrics metrics = SVGTextMetrics::measureCharacterRange(m_text, textPosition, metricsLength, m_textDirection);
ASSERT(metrics.length() == metricsLength);
unsigned startPosition = m_bidiRun ? m_bidiRun->start() : 0;
ASSERT(startPosition <= textPosition);
SVGTextMetrics complexStartToCurrentMetrics = SVGTextMetrics::measureCharacterRange(m_text, startPosition, textPosition - startPosition + metricsLength, m_textDirection);
// Frequent case for Arabic text: when measuring a single character the arabic isolated form is taken
// when rendering the glyph "in context" (with it's surrounding characters) it changes due to shaping.
// So whenever currentWidth != currentMetrics.width(), we are processing a text run whose length is
// not equal to the sum of the individual lengths of the glyphs, when measuring them isolated.
float currentWidth = complexStartToCurrentMetrics.width() - m_totalWidth;
if (currentWidth != metrics.width())
metrics.setWidth(currentWidth);
m_totalWidth = complexStartToCurrentMetrics.width();
return metrics;
}
float GraphicsContext::drawBidiText(const Font& font, const TextRun& run, const FloatPoint& point, Font::CustomFontNotReadyAction customFontNotReadyAction, BidiStatus* status, int length)
#endif
{
if (paintingDisabled())
#if !PLATFORM(IOS)
return;
#else
return 0;
#endif
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
#if !PLATFORM(IOS)
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
#else
bidiResolver.setStatus(status ? *status : BidiStatus(run.direction(), run.directionalOverride()));
#endif
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
// FIXME: This ownership should be reversed. We should pass BidiRunList
// to BidiResolver in createBidiRunsForLine.
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
#if !PLATFORM(IOS)
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));
#else
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, length < 0 ? run.length() : length));
#endif
if (!bidiRuns.runCount())
#if !PLATFORM(IOS)
return;
#else
return 0;
#endif
FloatPoint currPoint = point;
BidiCharacterRun* bidiRun = bidiRuns.firstRun();
while (bidiRun) {
TextRun subrun = run.subRun(bidiRun->start(), bidiRun->stop() - bidiRun->start());
bool isRTL = bidiRun->level() % 2;
subrun.setDirection(isRTL ? RTL : LTR);
subrun.setDirectionalOverride(bidiRun->dirOverride(false));
#if !PLATFORM(IOS)
font.drawText(this, subrun, currPoint, 0, -1, customFontNotReadyAction);
bidiRun = bidiRun->next();
// FIXME: Have Font::drawText return the width of what it drew so that we don't have to re-measure here.
if (bidiRun)
currPoint.move(font.width(subrun), 0);
#else
float width = font.drawText(this, subrun, currPoint, 0, -1, customFontNotReadyAction);
currPoint.move(width, 0);
bidiRun = bidiRun->next();
#endif
}
#if PLATFORM(IOS)
if (status)
*status = bidiResolver.status();
#endif
bidiRuns.deleteRuns();
#if PLATFORM(IOS)
return currPoint.x() - static_cast<float>(point.x());
#endif
}
void BidiTestRunner::runTest(const std::basic_string<UChar>& input, const std::vector<int>& expectedOrder,
const std::vector<int>& expectedLevels, bidi_test::ParagraphDirection paragraphDirection,
const std::string& line, size_t lineNumber)
{
if (!m_skippedCodePoints.empty()) {
for (size_t i = 0; i < input.size(); i++) {
if (m_skippedCodePoints.count(input[i])) {
m_testsSkipped++;
return;
}
}
}
m_testsRun++;
TextRun textRun(input.data(), input.size());
switch (paragraphDirection) {
case bidi_test::DirectionAutoLTR:
textRun.setDirection(determineParagraphDirectionality(textRun));
break;
case bidi_test::DirectionLTR:
textRun.setDirection(LTR);
break;
case bidi_test::DirectionRTL:
textRun.setDirection(RTL);
break;
}
BidiResolver<TextRunIterator, BidiCharacterRun> resolver;
resolver.setStatus(BidiStatus(textRun.direction(), textRun.directionalOverride()));
resolver.setPositionIgnoringNestedIsolates(TextRunIterator(&textRun, 0));
BidiRunList<BidiCharacterRun>& runs = resolver.runs();
resolver.createBidiRunsForLine(TextRunIterator(&textRun, textRun.length()));
std::ostringstream errorContext;
errorContext << ", line " << lineNumber << " \"" << line << "\"";
errorContext << " context: " << bidi_test::nameFromParagraphDirection(paragraphDirection);
std::vector<int> actualOrder;
std::vector<int> actualLevels;
actualLevels.assign(input.size(), -1);
BidiCharacterRun* run = runs.firstRun();
while (run) {
// Blink's UBA just makes runs, the actual ordering of the display of characters
// is handled later in our pipeline, so we fake it here:
bool reversed = run->reversed(false);
ASSERT(run->stop() >= run->start());
size_t length = run->stop() - run->start();
for (size_t i = 0; i < length; i++) {
int inputIndex = reversed ? run->stop() - i - 1 : run->start() + i;
if (!isNonRenderedCodePoint(input[inputIndex]))
actualOrder.push_back(inputIndex);
// BidiTest.txt gives expected level data in the order of the original input.
actualLevels[inputIndex] = run->level();
}
run = run->next();
}
if (expectedOrder.size() != actualOrder.size()) {
m_ignoredCharFailures++;
EXPECT_EQ(expectedOrder.size(), actualOrder.size()) << errorContext.str();
} else if (expectedOrder != actualOrder) {
m_orderFailures++;
printf("ORDER %s%s\n", diffString(actualOrder, expectedOrder).c_str(), errorContext.str().c_str());
}
if (expectedLevels.size() != actualLevels.size()) {
m_ignoredCharFailures++;
EXPECT_EQ(expectedLevels.size(), actualLevels.size()) << errorContext.str();
} else {
for (size_t i = 0; i < expectedLevels.size(); i++) {
// level == -1 means the level should be ignored.
if (expectedLevels[i] == actualLevels[i] || expectedLevels[i] == -1)
continue;
printf("LEVELS %s%s\n", diffString(actualLevels, expectedLevels).c_str(), errorContext.str().c_str());
m_levelFailures++;
break;
}
}
runs.deleteRuns();
}
