GlyphData FontCascadeFonts::glyphDataForNormalVariant(UChar32 c, const FontDescription& description)
{
const unsigned pageNumber = c / GlyphPage::size;
for (unsigned fallbackIndex = 0; true; ++fallbackIndex) {
auto& fontRanges = realizeFallbackRangesAt(description, fallbackIndex);
if (fontRanges.isNull())
break;
auto* font = fontRanges.fontForCharacter(c);
auto* page = font ? font->glyphPage(pageNumber) : nullptr;
if (!page)
continue;
GlyphData data = page->glyphDataForCharacter(c);
if (data.font) {
if (data.font->platformData().orientation() == Vertical && !data.font->isTextOrientationFallback()) {
if (!FontCascade::isCJKIdeographOrSymbol(c))
return glyphDataForNonCJKCharacterWithGlyphOrientation(c, description.nonCJKGlyphOrientation(), data);
if (!data.font->hasVerticalGlyphs()) {
// Use the broken ideograph font data. The broken ideograph font will use the horizontal width of glyphs
// to make sure you get a square (even for broken glyphs like symbols used for punctuation).
return glyphDataForVariant(c, description, BrokenIdeographVariant, fallbackIndex);
}
#if PLATFORM(COCOA)
if (data.font->platformData().syntheticOblique())
return glyphDataForCJKCharacterWithoutSyntheticItalic(c, data);
#endif
}
return data;
}
}
return glyphDataForSystemFallback(c, description, NormalVariant);
}
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;
}
std::pair<GlyphData, GlyphPage*> FontGlyphs::glyphDataAndPageForCharacter(const FontDescription& description, UChar32 c, bool mirror, FontDataVariant variant) const
{
ASSERT(isMainThread());
if (variant == AutoVariant) {
if (description.smallCaps() && !primarySimpleFontData(description)->isSVGFont()) {
UChar32 upperC = u_toupper(c);
if (upperC != c) {
c = upperC;
variant = SmallCapsVariant;
} else
variant = NormalVariant;
} else
variant = NormalVariant;
}
if (mirror)
c = u_charMirror(c);
unsigned pageNumber = (c / GlyphPage::size);
GlyphPageTreeNode* node = pageNumber ? m_pages.get(pageNumber) : m_pageZero;
if (!node) {
node = GlyphPageTreeNode::getRootChild(realizeFontDataAt(description, 0), pageNumber);
if (pageNumber)
m_pages.set(pageNumber, node);
else
m_pageZero = node;
}
GlyphPage* page = 0;
if (variant == NormalVariant) {
// Fastest loop, for the common case (normal variant).
while (true) {
page = node->page();
if (page) {
GlyphData data = page->glyphDataForCharacter(c);
if (data.fontData && (data.fontData->platformData().orientation() == Horizontal || data.fontData->isTextOrientationFallback()))
return std::make_pair(data, page);
if (data.fontData) {
if (Font::isCJKIdeographOrSymbol(c)) {
if (!data.fontData->hasVerticalGlyphs()) {
// Use the broken ideograph font data. The broken ideograph font will use the horizontal width of glyphs
// to make sure you get a square (even for broken glyphs like symbols used for punctuation).
variant = BrokenIdeographVariant;
break;
}
#if PLATFORM(COCOA)
else if (data.fontData->platformData().syntheticOblique())
return glyphDataAndPageForCJKCharacterWithoutSyntheticItalic(c, data, page, pageNumber);
#endif
} else
return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation(c, description.nonCJKGlyphOrientation(), data, page, pageNumber);
return std::make_pair(data, page);
}
if (node->isSystemFallback())
break;
}
node = node->getChild(realizeFontDataAt(description, node->level()), pageNumber);
if (pageNumber)
m_pages.set(pageNumber, node);
else
m_pageZero = node;
}
}
if (variant != NormalVariant) {
while (true) {
page = node->page();
if (page) {
GlyphData data = page->glyphDataForCharacter(c);
if (data.fontData) {
// The variantFontData function should not normally return 0.
// But if it does, we will just render the capital letter big.
RefPtr<SimpleFontData> variantFontData = data.fontData->variantFontData(description, variant);
if (!variantFontData)
return std::make_pair(data, page);
GlyphPageTreeNode* variantNode = GlyphPageTreeNode::getRootChild(variantFontData.get(), pageNumber);
GlyphPage* variantPage = variantNode->page();
if (variantPage) {
GlyphData data = variantPage->glyphDataForCharacter(c);
if (data.fontData)
return std::make_pair(data, variantPage);
}
// Do not attempt system fallback off the variantFontData. This is the very unlikely case that
// a font has the lowercase character but the small caps font does not have its uppercase version.
return std::make_pair(variantFontData->missingGlyphData(), page);
}
if (node->isSystemFallback())
break;
}
node = node->getChild(realizeFontDataAt(description, node->level()), pageNumber);
if (pageNumber)
m_pages.set(pageNumber, node);
else
m_pageZero = node;
}
}
ASSERT(page);
ASSERT(node->isSystemFallback());
// System fallback is character-dependent. When we get here, we
// know that the character in question isn't in the system fallback
// font's glyph page. Try to lazily create it here.
UChar codeUnits[2];
int codeUnitsLength;
if (c <= 0xFFFF) {
codeUnits[0] = Font::normalizeSpaces(c);
codeUnitsLength = 1;
} else {
codeUnits[0] = U16_LEAD(c);
codeUnits[1] = U16_TRAIL(c);
codeUnitsLength = 2;
}
const SimpleFontData* originalFontData = primaryFontData(description)->fontDataForCharacter(c);
RefPtr<SimpleFontData> characterFontData = fontCache().systemFallbackForCharacters(description, originalFontData, m_isForPlatformFont, codeUnits, codeUnitsLength);
if (characterFontData) {
if (characterFontData->platformData().orientation() == Vertical && !characterFontData->hasVerticalGlyphs() && Font::isCJKIdeographOrSymbol(c))
variant = BrokenIdeographVariant;
if (variant != NormalVariant)
characterFontData = characterFontData->variantFontData(description, variant);
}
if (characterFontData) {
// Got the fallback glyph and font.
GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData.get(), pageNumber)->page();
GlyphData data = fallbackPage && fallbackPage->fontDataForCharacter(c) ? fallbackPage->glyphDataForCharacter(c) : characterFontData->missingGlyphData();
// Cache it so we don't have to do system fallback again next time.
if (variant == NormalVariant) {
#if OS(WINCE)
// missingGlyphData returns a null character, which is not suitable for GDI to display.
// Also, sometimes we cannot map a font for the character on WINCE, but GDI can still
// display the character, probably because the font package is not installed correctly.
// So we just always set the glyph to be same as the character, and let GDI solve it.
page->setGlyphDataForCharacter(c, c, characterFontData.get());
characterFontData->setMaxGlyphPageTreeLevel(std::max(characterFontData->maxGlyphPageTreeLevel(), node->level()));
return std::make_pair(page->glyphDataForCharacter(c), page);
#else
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
data.fontData->setMaxGlyphPageTreeLevel(std::max(data.fontData->maxGlyphPageTreeLevel(), node->level()));
if (!Font::isCJKIdeographOrSymbol(c) && data.fontData->platformData().orientation() != Horizontal && !data.fontData->isTextOrientationFallback())
return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation(c, description.nonCJKGlyphOrientation(), data, fallbackPage, pageNumber);
#endif
}
return std::make_pair(data, page);
}
// Even system fallback can fail; use the missing glyph in that case.
// FIXME: It would be nicer to use the missing glyph from the last resort font instead.
GlyphData data = primarySimpleFontData(description)->missingGlyphData();
if (variant == NormalVariant) {
#if OS(WINCE)
// See comment about WINCE GDI handling near setGlyphDataForCharacter above.
page->setGlyphDataForCharacter(c, c, data.fontData);
data.fontData->setMaxGlyphPageTreeLevel(std::max(data.fontData->maxGlyphPageTreeLevel(), node->level()));
return std::make_pair(page->glyphDataForCharacter(c), page);
#else
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
data.fontData->setMaxGlyphPageTreeLevel(std::max(data.fontData->maxGlyphPageTreeLevel(), node->level()));
#endif
}
return std::make_pair(data, page);
}
