GlyphData SVGTextRunRenderingContext::glyphDataForCharacter(const Font& font, const TextRun& run, WidthIterator& iterator, UChar32 character, bool mirror, int currentCharacter, unsigned& advanceLength)
{
const SimpleFontData* primaryFont = font.primaryFont();
ASSERT(primaryFont);
pair<GlyphData, GlyphPage*> pair = font.glyphDataAndPageForCharacter(character, mirror);
GlyphData glyphData = pair.first;
// Check if we have the missing glyph data, in which case we can just return.
GlyphData missingGlyphData = primaryFont->missingGlyphData();
if (glyphData.glyph == missingGlyphData.glyph && glyphData.fontData == missingGlyphData.fontData) {
ASSERT(glyphData.fontData);
return glyphData;
}
// Characters enclosed by an <altGlyph> element, may not be registered in the GlyphPage.
const SimpleFontData* originalFontData = glyphData.fontData;
if (glyphData.fontData && !glyphData.fontData->isSVGFont()) {
if (TextRun::RenderingContext* renderingContext = run.renderingContext()) {
RenderObject* renderObject = static_cast<SVGTextRunRenderingContext*>(renderingContext)->renderer();
RenderObject* parentRenderObject = renderObject->isText() ? renderObject->parent() : renderObject;
ASSERT(parentRenderObject);
if (Element* parentRenderObjectElement = toElement(parentRenderObject->node())) {
if (parentRenderObjectElement->hasTagName(SVGNames::altGlyphTag))
glyphData.fontData = primaryFont;
}
}
}
const SimpleFontData* fontData = glyphData.fontData;
if (fontData) {
if (!fontData->isSVGFont())
return glyphData;
SVGFontElement* fontElement = 0;
SVGFontFaceElement* fontFaceElement = 0;
const SVGFontData* svgFontData = svgFontAndFontFaceElementForFontData(fontData, fontFaceElement, fontElement);
if (!fontElement || !fontFaceElement)
return glyphData;
// If we got here, we're dealing with a glyph defined in a SVG Font.
// The returned glyph by glyphDataAndPageForCharacter() is a glyph stored in the SVG Font glyph table.
// This doesn't necessarily mean the glyph is suitable for rendering/measuring in this context, its
// arabic-form/orientation/... may not match, we have to apply SVG Glyph selection to discover that.
if (svgFontData->applySVGGlyphSelection(iterator, glyphData, mirror, currentCharacter, advanceLength))
return glyphData;
}
GlyphPage* page = pair.second;
ASSERT(page);
FontFallbackList* fontList = font.fontList();
ASSERT(fontList);
// No suitable glyph found that is compatible with the requirments (same language, arabic-form, orientation etc.)
// Even though our GlyphPage contains an entry for eg. glyph "a", it's not compatible. So we have to temporarily
// remove the glyph data information from the GlyphPage, and retry the lookup, which handles font fallbacks correctly.
GlyphPageTreeNode* originalGlyphPageZero = fontList->glyphPageZero();
const FontFallbackList::GlyphPages& originalGlyphPages = fontList->glyphPages();
page->setGlyphDataForCharacter(character, glyphData.glyph, 0);
// Assure that the font fallback glyph selection worked, aka. the fallbackGlyphData font data is not the same as before.
GlyphData fallbackGlyphData = font.glyphDataForCharacter(character, mirror);
ASSERT(fallbackGlyphData.fontData != fontData);
// Restore original state of the SVG Font glyph table and the current font fallback list,
// to assure the next lookup of the same glyph won't immediately return the fallback glyph.
page->setGlyphDataForCharacter(character, glyphData.glyph, originalFontData);
fontList->setGlyphPageZero(originalGlyphPageZero);
fontList->setGlyphPages(originalGlyphPages);
ASSERT(fallbackGlyphData.fontData);
return fallbackGlyphData;
}
GlyphData SVGTextRunRenderingContext::glyphDataForCharacter(const Font& font, WidthIterator& iterator, UChar32 character, bool mirror, int currentCharacter, unsigned& advanceLength)
{
const SimpleFontData* primaryFont = font.primaryFont();
ASSERT(primaryFont);
std::pair<GlyphData, GlyphPage*> pair = font.glyphDataAndPageForCharacter(character, mirror, AutoVariant);
GlyphData glyphData = pair.first;
// Check if we have the missing glyph data, in which case we can just return.
GlyphData missingGlyphData = primaryFont->missingGlyphData();
if (glyphData.glyph == missingGlyphData.glyph && glyphData.fontData == missingGlyphData.fontData) {
ASSERT(glyphData.fontData);
return glyphData;
}
// Save data fromt he font fallback list because we may modify it later. Do this before the
// potential change to glyphData.fontData below.
FontGlyphs* glyph = font.glyphs();
ASSERT(glyph);
FontGlyphs::GlyphPagesStateSaver glyphPagesSaver(*glyph);
// Characters enclosed by an <altGlyph> element, may not be registered in the GlyphPage.
const SimpleFontData* originalFontData = glyphData.fontData;
if (glyphData.fontData && !glyphData.fontData->isSVGFont()) {
auto& elementRenderer = renderer().isRenderElement() ? toRenderElement(renderer()) : *renderer().parent();
if (Element* parentRendererElement = elementRenderer.element()) {
if (parentRendererElement->hasTagName(SVGNames::altGlyphTag))
glyphData.fontData = primaryFont;
}
}
const SimpleFontData* fontData = glyphData.fontData;
if (fontData) {
if (!fontData->isSVGFont())
return glyphData;
SVGFontElement* fontElement = 0;
SVGFontFaceElement* fontFaceElement = 0;
const SVGFontData* svgFontData = svgFontAndFontFaceElementForFontData(fontData, fontFaceElement, fontElement);
if (!fontElement || !fontFaceElement)
return glyphData;
// If we got here, we're dealing with a glyph defined in a SVG Font.
// The returned glyph by glyphDataAndPageForCharacter() is a glyph stored in the SVG Font glyph table.
// This doesn't necessarily mean the glyph is suitable for rendering/measuring in this context, its
// arabic-form/orientation/... may not match, we have to apply SVG Glyph selection to discover that.
if (svgFontData->applySVGGlyphSelection(iterator, glyphData, mirror, currentCharacter, advanceLength))
return glyphData;
}
GlyphPage* page = pair.second;
ASSERT(page);
// No suitable glyph found that is compatible with the requirments (same language, arabic-form, orientation etc.)
// Even though our GlyphPage contains an entry for eg. glyph "a", it's not compatible. So we have to temporarily
// remove the glyph data information from the GlyphPage, and retry the lookup, which handles font fallbacks correctly.
page->setGlyphDataForCharacter(character, 0, 0);
// Assure that the font fallback glyph selection worked, aka. the fallbackGlyphData font data is not the same as before.
GlyphData fallbackGlyphData = font.glyphDataForCharacter(character, mirror);
ASSERT(fallbackGlyphData.fontData != fontData);
// Restore original state of the SVG Font glyph table and the current font fallback list,
// to assure the next lookup of the same glyph won't immediately return the fallback glyph.
page->setGlyphDataForCharacter(character, glyphData.glyph, originalFontData);
ASSERT(fallbackGlyphData.fontData);
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);
}
GlyphData Font::glyphDataForCharacter(UChar32 c, bool mirror, FontDataVariant variant) const
{
ASSERT(isMainThread());
if (variant == AutoVariant) {
if (m_fontDescription.smallCaps()) {
UChar32 upperC = toUpper(c);
if (upperC != c) {
c = upperC;
variant = SmallCapsVariant;
} else
variant = NormalVariant;
} else
variant = NormalVariant;
}
if (mirror)
c = mirroredChar(c);
unsigned pageNumber = (c / GlyphPage::size);
GlyphPageTreeNode* node = pageNumber ? m_fontList->m_pages.get(pageNumber) : m_fontList->m_pageZero;
if (!node) {
node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
if (pageNumber)
m_fontList->m_pages.set(pageNumber, node);
else
m_fontList->m_pageZero = node;
}
GlyphPage* page;
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 data;
if (data.fontData) {
if (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).
const SimpleFontData* brokenIdeographFontData = data.fontData->brokenIdeographFontData();
GlyphPageTreeNode* brokenIdeographNode = GlyphPageTreeNode::getRootChild(brokenIdeographFontData, pageNumber);
const GlyphPage* brokenIdeographPage = brokenIdeographNode->page();
if (brokenIdeographPage) {
GlyphData brokenIdeographData = brokenIdeographPage->glyphDataForCharacter(c);
if (brokenIdeographData.fontData)
return brokenIdeographData;
}
// Shouldn't be possible to even reach this point.
ASSERT_NOT_REACHED();
}
} else {
if (m_fontDescription.textOrientation() == TextOrientationVerticalRight) {
const SimpleFontData* verticalRightFontData = data.fontData->verticalRightOrientationFontData();
GlyphPageTreeNode* verticalRightNode = GlyphPageTreeNode::getRootChild(verticalRightFontData, pageNumber);
const GlyphPage* verticalRightPage = verticalRightNode->page();
if (verticalRightPage) {
GlyphData verticalRightData = verticalRightPage->glyphDataForCharacter(c);
// If the glyphs are distinct, we will make the assumption that the font has a vertical-right glyph baked
// into it.
if (data.glyph != verticalRightData.glyph)
return data;
// The glyphs are identical, meaning that we should just use the horizontal glyph.
if (verticalRightData.fontData)
return verticalRightData;
}
} else if (m_fontDescription.textOrientation() == TextOrientationUpright) {
const SimpleFontData* uprightFontData = data.fontData->uprightOrientationFontData();
GlyphPageTreeNode* uprightNode = GlyphPageTreeNode::getRootChild(uprightFontData, pageNumber);
const GlyphPage* uprightPage = uprightNode->page();
if (uprightPage) {
GlyphData uprightData = uprightPage->glyphDataForCharacter(c);
// If the glyphs are the same, then we know we can just use the horizontal glyph rotated vertically to be upright.
if (data.glyph == uprightData.glyph)
return data;
// The glyphs are distinct, meaning that the font has a vertical-right glyph baked into it. We can't use that
// glyph, so we fall back to the upright data and use the horizontal glyph.
if (uprightData.fontData)
return uprightData;
}
}
// Shouldn't be possible to even reach this point.
ASSERT_NOT_REACHED();
}
return data;
}
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(node->level()), pageNumber);
if (pageNumber)
m_fontList->m_pages.set(pageNumber, node);
else
m_fontList->m_pageZero = node;
}
} else {
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.
const SimpleFontData* variantFontData = data.fontData->variantFontData(m_fontDescription, variant);
if (!variantFontData)
return data;
GlyphPageTreeNode* variantNode = GlyphPageTreeNode::getRootChild(variantFontData, pageNumber);
const GlyphPage* variantPage = variantNode->page();
if (variantPage) {
GlyphData data = variantPage->glyphDataForCharacter(c);
if (data.fontData)
return data;
}
// 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 variantFontData->missingGlyphData();
}
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(node->level()), pageNumber);
if (pageNumber)
m_fontList->m_pages.set(pageNumber, node);
else
m_fontList->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* characterFontData = fontCache()->getFontDataForCharacters(*this, codeUnits, codeUnitsLength);
if (variant != NormalVariant && characterFontData)
characterFontData = characterFontData->variantFontData(m_fontDescription, variant);
if (characterFontData) {
// Got the fallback glyph and font.
GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData, 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);
return page->glyphDataForCharacter(c);
#else
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
#endif
}
return data;
}
// 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 = primaryFont()->missingGlyphData();
if (variant == NormalVariant) {
#if OS(WINCE)
// See comment about WINCE GDI handling near setGlyphDataForCharacter above.
page->setGlyphDataForCharacter(c, c, data.fontData);
return page->glyphDataForCharacter(c);
#else
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
#endif
}
return data;
}
std::pair<GlyphData, GlyphPage*> Font::glyphDataAndPageForCharacter(UChar32 c, bool mirror, FontDataVariant variant) const
{
ASSERT(isMainThread());
if (variant == AutoVariant) {
if (m_fontDescription.smallCaps() && !primaryFont()->isSVGFont()) {
UChar32 upperC = toUpper(c);
if (upperC != c) {
c = upperC;
variant = SmallCapsVariant;
} else {
variant = NormalVariant;
}
} else {
variant = NormalVariant;
}
}
if (mirror)
c = mirroredChar(c);
unsigned pageNumber = (c / GlyphPage::size);
GlyphPageTreeNode* node = pageNumber ? m_fontFallbackList->m_pages.get(pageNumber) : m_fontFallbackList->m_pageZero;
if (!node) {
node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
if (pageNumber)
m_fontFallbackList->m_pages.set(pageNumber, node);
else
m_fontFallbackList->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 make_pair(data, page);
if (data.fontData) {
if (Character::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;
}
} else {
return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation(c, m_fontDescription.nonCJKGlyphOrientation(), data, page, pageNumber);
}
return make_pair(data, page);
}
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(node->level()), pageNumber);
if (pageNumber)
m_fontFallbackList->m_pages.set(pageNumber, node);
else
m_fontFallbackList->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(m_fontDescription, variant);
if (!variantFontData)
return 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 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 make_pair(variantFontData->missingGlyphData(), page);
}
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(node->level()), pageNumber);
if (pageNumber)
m_fontFallbackList->m_pages.set(pageNumber, node);
else
m_fontFallbackList->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.
// FIXME: Unclear if this should normalizeSpaces above 0xFFFF.
// Doing so changes fast/text/international/plane2-diffs.html
UChar32 characterToRender = c;
if (characterToRender <= 0xFFFF)
characterToRender = Character::normalizeSpaces(characterToRender);
const SimpleFontData* fontDataToSubstitute = fontDataAt(0)->fontDataForCharacter(characterToRender);
RefPtr<SimpleFontData> characterFontData = FontCache::fontCache()->platformFallbackForCharacter(m_fontDescription, characterToRender, fontDataToSubstitute);
if (characterFontData) {
if (characterFontData->platformData().orientation() == Vertical && !characterFontData->hasVerticalGlyphs() && Character::isCJKIdeographOrSymbol(c))
variant = BrokenIdeographVariant;
if (variant != NormalVariant)
characterFontData = characterFontData->variantFontData(m_fontDescription, 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) {
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
data.fontData->setMaxGlyphPageTreeLevel(max(data.fontData->maxGlyphPageTreeLevel(), node->level()));
if (!Character::isCJKIdeographOrSymbol(c) && data.fontData->platformData().orientation() != Horizontal && !data.fontData->isTextOrientationFallback())
return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation(c, m_fontDescription.nonCJKGlyphOrientation(), data, fallbackPage, pageNumber);
}
return 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 = primaryFont()->missingGlyphData();
if (variant == NormalVariant) {
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
data.fontData->setMaxGlyphPageTreeLevel(max(data.fontData->maxGlyphPageTreeLevel(), node->level()));
}
return make_pair(data, page);
}
const GlyphData& Font::glyphDataForCharacter(UChar32 c, bool mirror, bool forceSmallCaps) const
{
bool useSmallCapsFont = forceSmallCaps;
if (m_fontDescription.smallCaps()) {
UChar32 upperC = Unicode::toUpper(c);
if (upperC != c) {
c = upperC;
useSmallCapsFont = true;
}
}
if (mirror)
c = mirroredChar(c);
unsigned pageNumber = (c / GlyphPage::size);
GlyphPageTreeNode* node = pageNumber ? m_pages.get(pageNumber) : m_pageZero;
if (!node) {
node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
if (pageNumber)
m_pages.set(pageNumber, node);
else
m_pageZero = node;
}
GlyphPage* page;
if (!useSmallCapsFont) {
// Fastest loop, for the common case (not small caps).
while (true) {
page = node->page();
if (page) {
const GlyphData& data = page->glyphDataForCharacter(c);
if (data.fontData)
return data;
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(node->level()), pageNumber);
if (pageNumber)
m_pages.set(pageNumber, node);
else
m_pageZero = node;
}
} else {
while (true) {
page = node->page();
if (page) {
const GlyphData& data = page->glyphDataForCharacter(c);
if (data.fontData) {
// The smallCapsFontData function should not normally return 0.
// But if it does, we will just render the capital letter big.
const SimpleFontData* smallCapsFontData = data.fontData->smallCapsFontData(m_fontDescription);
if (!smallCapsFontData)
return data;
GlyphPageTreeNode* smallCapsNode = GlyphPageTreeNode::getRootChild(smallCapsFontData, pageNumber);
const GlyphPage* smallCapsPage = smallCapsNode->page();
if (smallCapsPage) {
const GlyphData& data = smallCapsPage->glyphDataForCharacter(c);
if (data.fontData)
return data;
}
// Do not attempt system fallback off the smallCapsFontData. 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 smallCapsFontData->missingGlyphData();
}
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(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) {
UChar c16 = c;
if (Font::treatAsSpace(c16))
codeUnits[0] = ' ';
else if (Font::treatAsZeroWidthSpace(c16))
codeUnits[0] = zeroWidthSpace;
else
codeUnits[0] = c16;
codeUnitsLength = 1;
} else {
codeUnits[0] = U16_LEAD(c);
codeUnits[1] = U16_TRAIL(c);
codeUnitsLength = 2;
}
const SimpleFontData* characterFontData = FontCache::getFontDataForCharacters(*this, codeUnits, codeUnitsLength);
if (useSmallCapsFont)
characterFontData = characterFontData->smallCapsFontData(m_fontDescription);
if (characterFontData) {
// Got the fallback glyph and font.
GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData, pageNumber)->page();
const GlyphData& data = fallbackPage && fallbackPage->glyphDataForCharacter(c).fontData ? fallbackPage->glyphDataForCharacter(c) : characterFontData->missingGlyphData();
// Cache it so we don't have to do system fallback again next time.
if (!useSmallCapsFont)
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
return data;
}
// 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.
const GlyphData& data = primaryFont()->missingGlyphData();
if (!useSmallCapsFont)
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
return data;
}
// FIXME: It is unfortunate that this function needs to be passed the original cluster.
// It is only required for the platform's FontCache::getFontDataForCharacters(), and it means
// that this function is not correct if it transforms the character to uppercase and calls
// FontCache::getFontDataForCharacters() afterwards.
const GlyphData& Font::glyphDataForCharacter(UChar32 c, const UChar* cluster, unsigned clusterLength, bool mirror, bool attemptFontSubstitution) const
{
bool smallCaps = false;
if (m_fontDescription.smallCaps() && !Unicode::isUpper(c)) {
// Convert lowercase to upper.
UChar32 upperC = Unicode::toUpper(c);
if (upperC != c) {
c = upperC;
smallCaps = true;
}
}
if (mirror)
c = mirroredChar(c);
unsigned pageNumber = (c / GlyphPage::size);
GlyphPageTreeNode* node = pageNumber ? m_pages.get(pageNumber) : m_pageZero;
if (!node) {
node = GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber);
if (pageNumber)
m_pages.set(pageNumber, node);
else
m_pageZero = node;
}
if (!attemptFontSubstitution && node->level() != 1)
node = GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber);
while (true) {
GlyphPage* page = node->page();
if (page) {
const GlyphData& data = page->glyphDataForCharacter(c);
if (data.glyph || !attemptFontSubstitution) {
if (!smallCaps)
return data; // We have a glyph for the character in question in the current page (or we've been told not to fall back).
const FontData* smallCapsFontData = data.fontData->smallCapsFontData(m_fontDescription);
if (!smallCapsFontData)
// This should not happen, but if it does, we will return a big cap.
return data;
GlyphPageTreeNode* smallCapsNode = GlyphPageTreeNode::getRootChild(smallCapsFontData, pageNumber);
GlyphPage* smallCapsPage = smallCapsNode->page();
if (smallCapsPage) {
const GlyphData& data = smallCapsPage->glyphDataForCharacter(c);
if (data.glyph || !attemptFontSubstitution)
return data;
}
// Not attempting system fallback off the smallCapsFontData. This is the very unlikely case that
// a font has the lowercase character but not its uppercase version.
return smallCapsFontData->missingGlyphData();
}
} else if (!attemptFontSubstitution) {
if (smallCaps) {
if (const FontData* smallCapsFontData = primaryFont()->smallCapsFontData(m_fontDescription))
return smallCapsFontData->missingGlyphData();
}
return primaryFont()->missingGlyphData();
}
if (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.
// Convert characters that shouldn't render to zero width spaces when asking what font is
// appropriate.
const FontData* characterFontData;
if (clusterLength == 1 && Font::treatAsZeroWidthSpace(cluster[0]))
#ifdef __OWB__
characterFontData = FontCache::getFontDataForCharacters(*this, &WebCore::zeroWidthSpace, 1);
#else
characterFontData = FontCache::getFontDataForCharacters(*this, &zeroWidthSpace, 1);
#endif //__OWB__
else
characterFontData = FontCache::getFontDataForCharacters(*this, cluster, clusterLength);
if (smallCaps)
characterFontData = characterFontData->smallCapsFontData(m_fontDescription);
if (characterFontData) {
// Got the fallback font, return the glyph page associated with
// it. We also store the FontData for the glyph in the fallback
// page for future use (it's lazily populated by us).
GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData, pageNumber)->page();
const GlyphData& data = fallbackPage ? fallbackPage->glyphDataForCharacter(c) : characterFontData->missingGlyphData();
if (!smallCaps)
page->setGlyphDataForCharacter(c, data.glyph, characterFontData);
return data;
}
// Even system fallback can fail.
// FIXME: Should the last resort font be used?
const GlyphData& data = primaryFont()->missingGlyphData();
if (!smallCaps && page)
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
return data;
}
// Proceed with the fallback list.
const FontData* fontData = fontDataAt(node->level());
node = node->getChild(fontData, pageNumber);
if (pageNumber)
m_pages.set(pageNumber, node);
else
m_pageZero = node;
}
GlyphData Font::glyphDataForCharacter(UChar32 c, bool mirror, bool forceSmallCaps) const
{
ASSERT(isMainThread());
bool useSmallCapsFont = forceSmallCaps;
if (m_fontDescription.smallCaps()) {
UChar32 upperC = toUpper(c);
if (upperC != c) {
c = upperC;
useSmallCapsFont = true;
}
}
if (mirror)
c = mirroredChar(c);
unsigned pageNumber = (c / GlyphPage::size);
GlyphPageTreeNode* node = pageNumber ? m_fontList->m_pages.get(pageNumber) : m_fontList->m_pageZero;
if (!node) {
node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
if (pageNumber)
m_fontList->m_pages.set(pageNumber, node);
else
m_fontList->m_pageZero = node;
}
GlyphPage* page;
if (!useSmallCapsFont) {
// Fastest loop, for the common case (not small caps).
while (true) {
page = node->page();
if (page) {
GlyphData data = page->glyphDataForCharacter(c);
if (data.fontData)
return data;
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(node->level()), pageNumber);
if (pageNumber)
m_fontList->m_pages.set(pageNumber, node);
else
m_fontList->m_pageZero = node;
}
} else {
while (true) {
page = node->page();
if (page) {
GlyphData data = page->glyphDataForCharacter(c);
if (data.fontData) {
// The smallCapsFontData function should not normally return 0.
// But if it does, we will just render the capital letter big.
const SimpleFontData* smallCapsFontData = data.fontData->smallCapsFontData(m_fontDescription);
if (!smallCapsFontData)
return data;
GlyphPageTreeNode* smallCapsNode = GlyphPageTreeNode::getRootChild(smallCapsFontData, pageNumber);
const GlyphPage* smallCapsPage = smallCapsNode->page();
if (smallCapsPage) {
GlyphData data = smallCapsPage->glyphDataForCharacter(c);
if (data.fontData)
return data;
}
// Do not attempt system fallback off the smallCapsFontData. 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 smallCapsFontData->missingGlyphData();
}
if (node->isSystemFallback())
break;
}
// Proceed with the fallback list.
node = node->getChild(fontDataAt(node->level()), pageNumber);
if (pageNumber)
m_fontList->m_pages.set(pageNumber, node);
else
m_fontList->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* characterFontData = fontCache()->getFontDataForCharacters(*this, codeUnits, codeUnitsLength);
if (useSmallCapsFont && characterFontData)
characterFontData = characterFontData->smallCapsFontData(m_fontDescription);
if (characterFontData) {
// Got the fallback glyph and font.
GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData, 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 (!useSmallCapsFont) {
#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);
return page->glyphDataForCharacter(c);
#else
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
#endif
}
return data;
}
// 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 = primaryFont()->missingGlyphData();
if (!useSmallCapsFont) {
#if OS(WINCE)
// See comment about WINCE GDI handling near setGlyphDataForCharacter above.
page->setGlyphDataForCharacter(c, c, data.fontData);
return page->glyphDataForCharacter(c);
#else
page->setGlyphDataForCharacter(c, data.glyph, data.fontData);
#endif
}
return data;
}
