GlyphData Font::glyphDataForCharacter(UChar32 character) const
{
auto* page = glyphPage(character / GlyphPage::size);
if (!page)
return GlyphData();
return page->glyphDataForCharacter(character);
}
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::glyphDataForSystemFallback(UChar32 c, const FontDescription& description, FontVariant variant)
{
// System fallback is character-dependent.
auto& primaryRanges = realizeFallbackRangesAt(description, 0);
auto* originalFont = primaryRanges.fontForCharacter(c);
if (!originalFont)
originalFont = &primaryRanges.fontForFirstRange();
RefPtr<Font> systemFallbackFont = originalFont->systemFallbackFontForCharacter(c, description, m_isForPlatformFont);
if (!systemFallbackFont)
return GlyphData();
if (systemFallbackFont->platformData().orientation() == Vertical && !systemFallbackFont->hasVerticalGlyphs() && FontCascade::isCJKIdeographOrSymbol(c))
variant = BrokenIdeographVariant;
GlyphData fallbackGlyphData;
if (variant == NormalVariant)
fallbackGlyphData = systemFallbackFont->glyphDataForCharacter(c);
else
fallbackGlyphData = systemFallbackFont->variantFont(description, variant)->glyphDataForCharacter(c);
if (variant == NormalVariant && fallbackGlyphData.font) {
if (!FontCascade::isCJKIdeographOrSymbol(c) && fallbackGlyphData.font->platformData().orientation() == Vertical && !fallbackGlyphData.font->isTextOrientationFallback())
fallbackGlyphData = glyphDataForNonCJKCharacterWithGlyphOrientation(c, description.nonCJKGlyphOrientation(), fallbackGlyphData);
}
// Keep the system fallback fonts we use alive.
if (fallbackGlyphData.glyph)
m_systemFallbackFontSet.add(systemFallbackFont.release());
return fallbackGlyphData;
}
GlyphData FontCascadeFonts::glyphDataForVariant(UChar32 c, const FontDescription& description, FontVariant variant, unsigned fallbackIndex)
{
while (true) {
auto& fontRanges = realizeFallbackRangesAt(description, fallbackIndex++);
if (fontRanges.isNull())
break;
auto* font = fontRanges.fontForCharacter(c);
GlyphData data = font ? font->glyphDataForCharacter(c) : GlyphData();
if (data.font) {
// The variantFont function should not normally return 0.
// But if it does, we will just render the capital letter big.
RefPtr<Font> variantFont = data.font->variantFont(description, variant);
if (!variantFont)
return data;
return variantFont->glyphDataForCharacter(c);
}
}
return glyphDataForSystemFallback(c, description, variant);
}
