inline bool HarfBuzzShaper::shapeRange(hb_buffer_t* harfBuzzBuffer,
unsigned startIndex,
unsigned numCharacters,
const SimpleFontData* currentFont,
PassRefPtr<UnicodeRangeSet> currentFontRangeSet,
UScriptCode currentRunScript,
hb_language_t language)
{
const FontPlatformData* platformData = &(currentFont->platformData());
HarfBuzzFace* face = platformData->harfBuzzFace();
if (!face) {
DLOG(ERROR) << "Could not create HarfBuzzFace from FontPlatformData.";
return false;
}
hb_buffer_set_language(harfBuzzBuffer, language);
hb_buffer_set_script(harfBuzzBuffer, ICUScriptToHBScript(currentRunScript));
hb_buffer_set_direction(harfBuzzBuffer, TextDirectionToHBDirection(m_textRun.direction(),
m_font->getFontDescription().orientation(), currentFont));
addToHarfBuzzBufferInternal(harfBuzzBuffer,
m_font->getFontDescription(), m_normalizedBuffer.get(), m_normalizedBufferLength,
startIndex, numCharacters);
HarfBuzzScopedPtr<hb_font_t> harfBuzzFont(face->createFont(currentFontRangeSet), hb_font_destroy);
hb_shape(harfBuzzFont.get(), harfBuzzBuffer, m_features.isEmpty() ? 0 : m_features.data(), m_features.size());
return true;
}
bool HarfBuzzShaper::shapeHarfBuzzRuns(bool shouldSetDirection)
{
HarfBuzzScopedPtr<hb_buffer_t> harfBuzzBuffer(hb_buffer_create(), hb_buffer_destroy);
hb_buffer_set_unicode_funcs(harfBuzzBuffer.get(), hb_icu_get_unicode_funcs());
for (unsigned i = 0; i < m_harfBuzzRuns.size(); ++i) {
unsigned runIndex = m_run.rtl() ? m_harfBuzzRuns.size() - i - 1 : i;
HarfBuzzRun* currentRun = m_harfBuzzRuns[runIndex].get();
const SimpleFontData* currentFontData = currentRun->fontData();
if (currentFontData->isSVGFont())
return false;
hb_buffer_set_script(harfBuzzBuffer.get(), currentRun->script());
if (shouldSetDirection)
hb_buffer_set_direction(harfBuzzBuffer.get(), currentRun->rtl() ? HB_DIRECTION_RTL : HB_DIRECTION_LTR);
else
// Leaving direction to HarfBuzz to guess is *really* bad, but will do for now.
hb_buffer_guess_segment_properties(harfBuzzBuffer.get());
// Add a space as pre-context to the buffer. This prevents showing dotted-circle
// for combining marks at the beginning of runs.
static const uint16_t preContext = ' ';
hb_buffer_add_utf16(harfBuzzBuffer.get(), &preContext, 1, 1, 0);
if (m_font->isSmallCaps() && u_islower(m_normalizedBuffer[currentRun->startIndex()])) {
String upperText = String(m_normalizedBuffer.get() + currentRun->startIndex(), currentRun->numCharacters());
upperText.makeUpper();
currentFontData = m_font->glyphDataForCharacter(upperText[0], false, SmallCapsVariant).fontData;
hb_buffer_add_utf16(harfBuzzBuffer.get(), upperText.characters(), currentRun->numCharacters(), 0, currentRun->numCharacters());
} else
hb_buffer_add_utf16(harfBuzzBuffer.get(), m_normalizedBuffer.get() + currentRun->startIndex(), currentRun->numCharacters(), 0, currentRun->numCharacters());
FontPlatformData* platformData = const_cast<FontPlatformData*>(¤tFontData->platformData());
HarfBuzzFace* face = platformData->harfBuzzFace();
if (!face)
return false;
if (m_font->fontDescription().orientation() == Vertical)
face->setScriptForVerticalGlyphSubstitution(harfBuzzBuffer.get());
HarfBuzzScopedPtr<hb_font_t> harfBuzzFont(face->createFont(), hb_font_destroy);
hb_shape(harfBuzzFont.get(), harfBuzzBuffer.get(), m_features.isEmpty() ? 0 : m_features.data(), m_features.size());
currentRun->applyShapeResult(harfBuzzBuffer.get());
setGlyphPositionsForHarfBuzzRun(currentRun, harfBuzzBuffer.get());
hb_buffer_reset(harfBuzzBuffer.get());
}
return true;
}
