CSSSegmentedFontFace.cpp [plain text]
#include "config.h"
#include "CSSSegmentedFontFace.h"
#include "CSSFontFace.h"
#include "CSSFontFaceSource.h"
#include "CSSFontSelector.h"
#include "Document.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "RuntimeEnabledFeatures.h"
namespace WebCore {
CSSSegmentedFontFace::CSSSegmentedFontFace()
{
}
CSSSegmentedFontFace::~CSSSegmentedFontFace()
{
for (auto& face : m_fontFaces)
face->removeClient(*this);
}
void CSSSegmentedFontFace::appendFontFace(Ref<CSSFontFace>&& fontFace)
{
m_cache.clear();
fontFace->addClient(*this);
m_fontFaces.append(WTFMove(fontFace));
}
void CSSSegmentedFontFace::fontLoaded(CSSFontFace&)
{
m_cache.clear();
}
class CSSFontAccessor final : public FontAccessor {
public:
static Ref<CSSFontAccessor> create(CSSFontFace& fontFace, const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic)
{
return adoptRef(*new CSSFontAccessor(fontFace, fontDescription, syntheticBold, syntheticItalic));
}
const Font* font() const final
{
if (!m_result)
m_result = m_fontFace->font(m_fontDescription, m_syntheticBold, m_syntheticItalic);
return m_result.value().get();
}
private:
CSSFontAccessor(CSSFontFace& fontFace, const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic)
: m_fontFace(fontFace)
, m_fontDescription(fontDescription)
, m_syntheticBold(syntheticBold)
, m_syntheticItalic(syntheticItalic)
{
}
bool isLoading() const final
{
return m_result && m_result.value() && m_result.value()->isLoading();
}
mutable Optional<RefPtr<Font>> m_result; mutable Ref<CSSFontFace> m_fontFace;
FontDescription m_fontDescription;
bool m_syntheticBold;
bool m_syntheticItalic;
};
static void appendFontWithInvalidUnicodeRangeIfLoading(FontRanges& ranges, Ref<FontAccessor>&& fontAccessor, const Vector<CSSFontFace::UnicodeRange>& unicodeRanges)
{
if (fontAccessor->isLoading()) {
ranges.appendRange({ 0, 0, WTFMove(fontAccessor) });
return;
}
if (unicodeRanges.isEmpty()) {
ranges.appendRange({ 0, 0x7FFFFFFF, WTFMove(fontAccessor) });
return;
}
for (auto& range : unicodeRanges)
ranges.appendRange({ range.from, range.to, fontAccessor.copyRef() });
}
FontRanges CSSSegmentedFontFace::fontRanges(const FontDescription& fontDescription)
{
FontTraitsMask desiredTraitsMask = fontDescription.traitsMask();
auto addResult = m_cache.add(FontDescriptionKey(fontDescription), FontRanges());
auto& result = addResult.iterator->value;
if (addResult.isNewEntry) {
for (auto& face : m_fontFaces) {
if (face->allSourcesFailed())
continue;
FontTraitsMask traitsMask = face->traitsMask();
bool syntheticBold = (fontDescription.fontSynthesis() & FontSynthesisWeight) && !(traitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask)) && (desiredTraitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask));
bool syntheticItalic = (fontDescription.fontSynthesis() & FontSynthesisStyle) && !(traitsMask & FontStyleItalicMask) && (desiredTraitsMask & FontStyleItalicMask);
auto fontAccessor = CSSFontAccessor::create(face, fontDescription, syntheticBold, syntheticItalic);
if (result.isNull() && !fontAccessor->font())
continue;
appendFontWithInvalidUnicodeRangeIfLoading(result, WTFMove(fontAccessor), face->ranges());
}
}
return result;
}
}