GlyphData FontCascadeFonts::glyphDataForCharacter(UChar32 c, const FontDescription& description, FontVariant variant)
{
ASSERT(isMainThread());
ASSERT(variant != AutoVariant);
if (variant != NormalVariant)
return glyphDataForVariant(c, description, variant, 0);
const unsigned pageNumber = c / GlyphPage::size;
RefPtr<GlyphPage>& cachedPage = pageNumber ? m_cachedPages.add(pageNumber, nullptr).iterator->value : m_cachedPageZero;
if (!cachedPage)
cachedPage = glyphPageFromFontRanges(pageNumber, realizeFallbackRangesAt(description, 0));
GlyphData glyphData = cachedPage ? cachedPage->glyphDataForCharacter(c) : GlyphData();
if (!glyphData.glyph) {
if (!cachedPage)
cachedPage = GlyphPage::createForMixedFonts();
else if (cachedPage->isImmutable())
cachedPage = GlyphPage::createCopyForMixedFonts(*cachedPage);
glyphData = glyphDataForNormalVariant(c, description);
cachedPage->setGlyphDataForCharacter(c, glyphData.glyph, glyphData.font);
}
return glyphData;
}
GlyphData FontCascadeFonts::glyphDataForCharacter(UChar32 c, const FontCascadeDescription& description, FontVariant variant)
{
ASSERT(isMainThread());
ASSERT(variant != AutoVariant);
if (variant != NormalVariant)
return glyphDataForVariant(c, description, variant, 0);
const unsigned pageNumber = c / GlyphPage::size;
auto& cacheEntry = pageNumber ? m_cachedPages.add(pageNumber, GlyphPageCacheEntry()).iterator->value : m_cachedPageZero;
// Initialize cache with a full page of glyph mappings from a single font.
if (cacheEntry.isNull())
cacheEntry.setSingleFontPage(glyphPageFromFontRanges(pageNumber, realizeFallbackRangesAt(description, 0)));
GlyphData glyphData = cacheEntry.glyphDataForCharacter(c);
if (!glyphData.glyph) {
// No glyph, resolve per-character.
glyphData = glyphDataForNormalVariant(c, description);
// Cache the results.
cacheEntry.setGlyphDataForCharacter(c, glyphData);
}
return glyphData;
}
