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));
hb_font_t* hbFont = face->getScaledFont(currentFontRangeSet);
hb_shape(hbFont, harfBuzzBuffer, m_features.isEmpty() ? 0 : m_features.data(), m_features.size());
return true;
}
bool FontPlatformData::hasSpaceInLigaturesOrKerning(
TypesettingFeatures features) const {
HarfBuzzFace* hbFace = harfBuzzFace();
if (!hbFace)
return false;
hb_font_t* font = hbFace->getScaledFont();
ASSERT(font);
hb_face_t* face = hb_font_get_face(font);
ASSERT(face);
hb_codepoint_t space;
// If the space glyph isn't present in the font then each space character
// will be rendering using a fallback font, which grantees that it cannot
// affect the shape of the preceding word.
if (!hb_font_get_glyph(font, spaceCharacter, 0, &space))
return false;
if (!hb_ot_layout_has_substitution(face) &&
!hb_ot_layout_has_positioning(face)) {
return false;
}
bool foundSpaceInTable = false;
hb_set_t* glyphs = hb_set_create();
if (features & Kerning)
foundSpaceInTable = tableHasSpace(face, glyphs, HB_OT_TAG_GPOS, space);
if (!foundSpaceInTable && (features & Ligatures))
foundSpaceInTable = tableHasSpace(face, glyphs, HB_OT_TAG_GSUB, space);
hb_set_destroy(glyphs);
return foundSpaceInTable;
}
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;
}
bool HarfBuzzShaper::shapeHarfBuzzRun()
{
FontPlatformData* platformData = const_cast<FontPlatformData*>(&m_currentFontData->platformData());
HarfBuzzFace* face = platformData->harfbuzzFace();
if (!face)
return false;
hb_font_t* harfbuzzFont = face->createFont();
hb_shape(harfbuzzFont, m_harfbuzzBuffer, m_features.size() > 0 ? m_features.data() : 0, m_features.size());
hb_font_destroy(harfbuzzFont);
m_harfbuzzRuns.append(HarfBuzzRun::create(m_numCharactersOfCurrentRun, m_run.direction(), m_harfbuzzBuffer));
return true;
}