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;
}