static bool
is_zero_width_char (hb_font_t *font,
hb_codepoint_t unicode)
{
hb_codepoint_t glyph;
return hb_font_get_glyph (font, unicode, 0, &glyph) && hb_font_get_glyph_h_advance (font, glyph) == 0;
}
bool FontPlatformData::hasSpaceInLigaturesOrKerning(
TypesettingFeatures features) const
{
const HarfBuzzFace* hbFace = harfBuzzFace();
if (!hbFace)
return false;
hb_face_t* face = hbFace->face();
ASSERT(face);
OwnPtr<hb_font_t> font = adoptPtr(hbFace->createFont());
ASSERT(font);
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.get(), 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 FontFamily::hasGlyph(uint32_t codepoint,
uint32_t variationSelector) const {
assertMinikinLocked();
if (variationSelector != 0 && !mHasVSTable) {
// Early exit if the variation selector is specified but the font doesn't
// have a cmap format 14 subtable.
return false;
}
const FontStyle defaultStyle;
hb_font_t* font = getHbFontLocked(getClosestMatch(defaultStyle).font);
uint32_t unusedGlyph;
bool result =
hb_font_get_glyph(font, codepoint, variationSelector, &unusedGlyph);
hb_font_destroy(font);
return result;
}
