#include "config.h"
#include "FontCascade.h"
#include "CharacterProperties.h"
#include "FloatRect.h"
#include "FontCache.h"
#include "GlyphBuffer.h"
#include "GraphicsContext.h"
#include "LayoutRect.h"
#include "SurrogatePairAwareTextIterator.h"
#include "TextRun.h"
#include "WidthIterator.h"
#include <wtf/MainThread.h>
#include <wtf/MathExtras.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/text/AtomicStringHash.h>
#include <wtf/text/StringBuilder.h>
using namespace WTF;
using namespace Unicode;
namespace WebCore {
static Ref<FontCascadeFonts> retrieveOrAddCachedFonts(const FontCascadeDescription&, RefPtr<FontSelector>&&);
static bool useBackslashAsYenSignForFamily(const AtomicString& family)
{
if (family.isEmpty())
return false;
static HashSet<AtomicString>* set;
if (!set) {
set = new HashSet<AtomicString>;
set->add("MS PGothic");
UChar unicodeNameMSPGothic[] = {0xFF2D, 0xFF33, 0x0020, 0xFF30, 0x30B4, 0x30B7, 0x30C3, 0x30AF};
set->add(AtomicString(unicodeNameMSPGothic, WTF_ARRAY_LENGTH(unicodeNameMSPGothic)));
set->add("MS PMincho");
UChar unicodeNameMSPMincho[] = {0xFF2D, 0xFF33, 0x0020, 0xFF30, 0x660E, 0x671D};
set->add(AtomicString(unicodeNameMSPMincho, WTF_ARRAY_LENGTH(unicodeNameMSPMincho)));
set->add("MS Gothic");
UChar unicodeNameMSGothic[] = {0xFF2D, 0xFF33, 0x0020, 0x30B4, 0x30B7, 0x30C3, 0x30AF};
set->add(AtomicString(unicodeNameMSGothic, WTF_ARRAY_LENGTH(unicodeNameMSGothic)));
set->add("MS Mincho");
UChar unicodeNameMSMincho[] = {0xFF2D, 0xFF33, 0x0020, 0x660E, 0x671D};
set->add(AtomicString(unicodeNameMSMincho, WTF_ARRAY_LENGTH(unicodeNameMSMincho)));
set->add("Meiryo");
UChar unicodeNameMeiryo[] = {0x30E1, 0x30A4, 0x30EA, 0x30AA};
set->add(AtomicString(unicodeNameMeiryo, WTF_ARRAY_LENGTH(unicodeNameMeiryo)));
}
return set->contains(family);
}
FontCascade::CodePath FontCascade::s_codePath = Auto;
FontCascade::FontCascade()
: m_weakPtrFactory(this)
, m_letterSpacing(0)
, m_wordSpacing(0)
, m_useBackslashAsYenSymbol(false)
, m_enableKerning(false)
, m_requiresShaping(false)
{
}
FontCascade::FontCascade(const FontCascadeDescription& fd, float letterSpacing, float wordSpacing)
: m_fontDescription(fd)
, m_weakPtrFactory(this)
, m_letterSpacing(letterSpacing)
, m_wordSpacing(wordSpacing)
, m_useBackslashAsYenSymbol(useBackslashAsYenSignForFamily(fd.firstFamily()))
, m_enableKerning(computeEnableKerning())
, m_requiresShaping(computeRequiresShaping())
{
}
FontCascade::FontCascade(const FontPlatformData& fontData, FontSmoothingMode fontSmoothingMode)
: m_fonts(FontCascadeFonts::createForPlatformFont(fontData))
, m_weakPtrFactory(this)
, m_letterSpacing(0)
, m_wordSpacing(0)
, m_useBackslashAsYenSymbol(false)
, m_enableKerning(computeEnableKerning())
, m_requiresShaping(computeRequiresShaping())
{
m_fontDescription.setFontSmoothing(fontSmoothingMode);
#if PLATFORM(IOS)
m_fontDescription.setSpecifiedSize(CTFontGetSize(fontData.font()));
m_fontDescription.setComputedSize(CTFontGetSize(fontData.font()));
m_fontDescription.setIsItalic(CTFontGetSymbolicTraits(fontData.font()) & kCTFontTraitItalic);
m_fontDescription.setWeight((CTFontGetSymbolicTraits(fontData.font()) & kCTFontTraitBold) ? FontWeightBold : FontWeightNormal);
#endif
}
FontCascade::FontCascade(const FontCascade& other)
: m_fontDescription(other.m_fontDescription)
, m_fonts(other.m_fonts)
, m_weakPtrFactory(this)
, m_letterSpacing(other.m_letterSpacing)
, m_wordSpacing(other.m_wordSpacing)
, m_useBackslashAsYenSymbol(other.m_useBackslashAsYenSymbol)
, m_enableKerning(computeEnableKerning())
, m_requiresShaping(computeRequiresShaping())
{
}
FontCascade& FontCascade::operator=(const FontCascade& other)
{
m_fontDescription = other.m_fontDescription;
m_fonts = other.m_fonts;
m_letterSpacing = other.m_letterSpacing;
m_wordSpacing = other.m_wordSpacing;
m_useBackslashAsYenSymbol = other.m_useBackslashAsYenSymbol;
m_enableKerning = other.m_enableKerning;
m_requiresShaping = other.m_requiresShaping;
return *this;
}
bool FontCascade::operator==(const FontCascade& other) const
{
if (isLoadingCustomFonts() || other.isLoadingCustomFonts())
return false;
if (m_fontDescription != other.m_fontDescription || m_letterSpacing != other.m_letterSpacing || m_wordSpacing != other.m_wordSpacing)
return false;
if (m_fonts == other.m_fonts)
return true;
if (!m_fonts || !other.m_fonts)
return false;
if (m_fonts->fontSelector() != other.m_fonts->fontSelector())
return false;
if (m_fonts->fontSelectorVersion() != other.m_fonts->fontSelectorVersion())
return false;
if (m_fonts->generation() != other.m_fonts->generation())
return false;
return true;
}
struct FontCascadeCacheKey {
FontDescriptionKey fontDescriptionKey; Vector<AtomicString, 3> families;
unsigned fontSelectorId;
unsigned fontSelectorVersion;
};
struct FontCascadeCacheEntry {
WTF_MAKE_FAST_ALLOCATED;
public:
FontCascadeCacheEntry(FontCascadeCacheKey&& key, Ref<FontCascadeFonts>&& fonts)
: key(WTFMove(key))
, fonts(WTFMove(fonts))
{ }
FontCascadeCacheKey key;
Ref<FontCascadeFonts> fonts;
};
typedef HashMap<unsigned, std::unique_ptr<FontCascadeCacheEntry>, AlreadyHashed> FontCascadeCache;
static bool keysMatch(const FontCascadeCacheKey& a, const FontCascadeCacheKey& b)
{
if (a.fontDescriptionKey != b.fontDescriptionKey)
return false;
if (a.fontSelectorId != b.fontSelectorId || a.fontSelectorVersion != b.fontSelectorVersion)
return false;
unsigned size = a.families.size();
if (size != b.families.size())
return false;
for (unsigned i = 0; i < size; ++i) {
if (!equalIgnoringASCIICase(a.families[i], b.families[i]))
return false;
}
return true;
}
static FontCascadeCache& fontCascadeCache()
{
static NeverDestroyed<FontCascadeCache> cache;
return cache.get();
}
void invalidateFontCascadeCache()
{
fontCascadeCache().clear();
}
void clearWidthCaches()
{
for (auto& value : fontCascadeCache().values())
value->fonts.get().widthCache().clear();
}
static FontCascadeCacheKey makeFontCascadeCacheKey(const FontCascadeDescription& description, FontSelector* fontSelector)
{
FontCascadeCacheKey key;
key.fontDescriptionKey = FontDescriptionKey(description);
unsigned familyCount = description.familyCount();
key.families.reserveInitialCapacity(familyCount);
for (unsigned i = 0; i < familyCount; ++i)
key.families.uncheckedAppend(description.familyAt(i));
key.fontSelectorId = fontSelector ? fontSelector->uniqueId() : 0;
key.fontSelectorVersion = fontSelector ? fontSelector->version() : 0;
return key;
}
static unsigned computeFontCascadeCacheHash(const FontCascadeCacheKey& key)
{
IntegerHasher hasher;
hasher.add(key.fontDescriptionKey.computeHash());
hasher.add(key.fontSelectorId);
hasher.add(key.fontSelectorVersion);
for (unsigned i = 0; i < key.families.size(); ++i) {
StringImpl* family = key.families[i].impl();
hasher.add(family ? ASCIICaseInsensitiveHash::hash(family) : 0);
}
return hasher.hash();
}
void pruneUnreferencedEntriesFromFontCascadeCache()
{
fontCascadeCache().removeIf([](auto& entry) {
return entry.value->fonts.get().hasOneRef();
});
}
void pruneSystemFallbackFonts()
{
for (auto& entry : fontCascadeCache().values())
entry->fonts->pruneSystemFallbacks();
}
static Ref<FontCascadeFonts> retrieveOrAddCachedFonts(const FontCascadeDescription& fontDescription, RefPtr<FontSelector>&& fontSelector)
{
auto key = makeFontCascadeCacheKey(fontDescription, fontSelector.get());
unsigned hash = computeFontCascadeCacheHash(key);
auto addResult = fontCascadeCache().add(hash, nullptr);
if (!addResult.isNewEntry && keysMatch(addResult.iterator->value->key, key))
return addResult.iterator->value->fonts.get();
auto& newEntry = addResult.iterator->value;
newEntry = std::make_unique<FontCascadeCacheEntry>(WTFMove(key), FontCascadeFonts::create(WTFMove(fontSelector)));
Ref<FontCascadeFonts> glyphs = newEntry->fonts.get();
static const unsigned unreferencedPruneInterval = 50;
static const int maximumEntries = 400;
static unsigned pruneCounter;
if (!(++pruneCounter % unreferencedPruneInterval))
pruneUnreferencedEntriesFromFontCascadeCache();
if (fontCascadeCache().size() > maximumEntries)
fontCascadeCache().remove(fontCascadeCache().begin());
return glyphs;
}
void FontCascade::update(RefPtr<FontSelector>&& fontSelector) const
{
m_fonts = retrieveOrAddCachedFonts(m_fontDescription, WTFMove(fontSelector));
m_useBackslashAsYenSymbol = useBackslashAsYenSignForFamily(firstFamily());
m_enableKerning = computeEnableKerning();
m_requiresShaping = computeRequiresShaping();
}
float FontCascade::glyphBufferForTextRun(CodePath codePathToUse, const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer) const
{
if (codePathToUse != Complex)
return getGlyphsAndAdvancesForSimpleText(run, from, to, glyphBuffer);
return getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer);
}
float FontCascade::drawText(GraphicsContext& context, const TextRun& run, const FloatPoint& point, int from, int to, CustomFontNotReadyAction customFontNotReadyAction) const
{
if (isLoadingCustomFonts() && customFontNotReadyAction == DoNotPaintIfFontNotReady)
return 0;
to = (to == -1 ? run.length() : to);
CodePath codePathToUse = codePath(run);
if (codePathToUse != Complex && (enableKerning() || requiresShaping()) && (from || static_cast<unsigned>(to) != run.length()))
codePathToUse = Complex;
GlyphBuffer glyphBuffer;
float startX = point.x() + glyphBufferForTextRun(codePathToUse, run, from, to, glyphBuffer);
if (glyphBuffer.isEmpty())
return 0;
FloatPoint startPoint(startX, point.y());
drawGlyphBuffer(context, glyphBuffer, startPoint);
return startPoint.x() - startX;
}
void FontCascade::drawEmphasisMarks(GraphicsContext& context, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to) const
{
if (isLoadingCustomFonts())
return;
if (to < 0)
to = run.length();
CodePath codePathToUse = codePath(run);
if (codePathToUse != Complex && (enableKerning() || requiresShaping()) && (from || static_cast<unsigned>(to) != run.length()))
codePathToUse = Complex;
if (codePathToUse != Complex)
drawEmphasisMarksForSimpleText(context, run, mark, point, from, to);
else
drawEmphasisMarksForComplexText(context, run, mark, point, from, to);
}
float FontCascade::width(const TextRun& run, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
CodePath codePathToUse = codePath(run);
if (codePathToUse != Complex) {
if (!canReturnFallbackFontsForComplexText())
fallbackFonts = nullptr;
if (codePathToUse != SimpleWithGlyphOverflow && (glyphOverflow && !glyphOverflow->computeBounds))
glyphOverflow = nullptr;
}
bool hasWordSpacingOrLetterSpacing = wordSpacing() || letterSpacing();
float* cacheEntry = m_fonts->widthCache().add(run, std::numeric_limits<float>::quiet_NaN(), enableKerning() || requiresShaping(), hasWordSpacingOrLetterSpacing, glyphOverflow);
if (cacheEntry && !std::isnan(*cacheEntry))
return *cacheEntry;
HashSet<const Font*> localFallbackFonts;
if (!fallbackFonts)
fallbackFonts = &localFallbackFonts;
float result;
if (codePathToUse == Complex)
result = floatWidthForComplexText(run, fallbackFonts, glyphOverflow);
else
result = floatWidthForSimpleText(run, fallbackFonts, glyphOverflow);
if (cacheEntry && fallbackFonts->isEmpty())
*cacheEntry = result;
return result;
}
GlyphData FontCascade::glyphDataForCharacter(UChar32 c, bool mirror, FontVariant variant) const
{
if (variant == AutoVariant) {
if (m_fontDescription.variantCaps() == FontVariantCaps::Small) {
UChar32 upperC = u_toupper(c);
if (upperC != c) {
c = upperC;
variant = SmallCapsVariant;
} else
variant = NormalVariant;
} else
variant = NormalVariant;
}
if (mirror)
c = u_charMirror(c);
return m_fonts->glyphDataForCharacter(c, m_fontDescription, variant);
}
#if !PLATFORM(COCOA)
std::unique_ptr<TextLayout, TextLayoutDeleter> FontCascade::createLayout(RenderText&, float, bool) const
{
return nullptr;
}
void TextLayoutDeleter::operator()(TextLayout*) const
{
}
float FontCascade::width(TextLayout&, unsigned, unsigned, HashSet<const Font*>*)
{
ASSERT_NOT_REACHED();
return 0;
}
#endif
static const char* fontFamiliesWithInvalidCharWidth[] = {
"American Typewriter",
"Arial Hebrew",
"Chalkboard",
"Cochin",
"Corsiva Hebrew",
"Courier",
"Euphemia UCAS",
"Geneva",
"Gill Sans",
"Hei",
"Helvetica",
"Hoefler Text",
"InaiMathi",
"Kai",
"Lucida Grande",
"Marker Felt",
"Monaco",
"Mshtakan",
"New Peninim MT",
"Osaka",
"Raanana",
"STHeiti",
"Symbol",
"Times",
"Apple Braille",
"Apple LiGothic",
"Apple LiSung",
"Apple Symbols",
"AppleGothic",
"AppleMyungjo",
"#GungSeo",
"#HeadLineA",
"#PCMyungjo",
"#PilGi",
};
bool FontCascade::hasValidAverageCharWidth() const
{
AtomicString family = firstFamily();
if (family.isEmpty())
return false;
#if PLATFORM(MAC) || PLATFORM(IOS)
if (primaryFontIsSystemFont())
return false;
#endif
static HashSet<AtomicString>* fontFamiliesWithInvalidCharWidthMap = 0;
if (!fontFamiliesWithInvalidCharWidthMap) {
fontFamiliesWithInvalidCharWidthMap = new HashSet<AtomicString>;
for (size_t i = 0; i < WTF_ARRAY_LENGTH(fontFamiliesWithInvalidCharWidth); ++i)
fontFamiliesWithInvalidCharWidthMap->add(AtomicString(fontFamiliesWithInvalidCharWidth[i]));
}
return !fontFamiliesWithInvalidCharWidthMap->contains(family);
}
bool FontCascade::fastAverageCharWidthIfAvailable(float& width) const
{
bool success = hasValidAverageCharWidth();
if (success)
width = roundf(primaryFont().avgCharWidth()); return success;
}
void FontCascade::adjustSelectionRectForText(const TextRun& run, LayoutRect& selectionRect, int from, int to) const
{
to = (to == -1 ? run.length() : to);
CodePath codePathToUse = codePath(run);
if (codePathToUse != Complex && (enableKerning() || requiresShaping()) && (from || static_cast<unsigned>(to) != run.length()))
codePathToUse = Complex;
if (codePathToUse != Complex)
return adjustSelectionRectForSimpleText(run, selectionRect, from, to);
return adjustSelectionRectForComplexText(run, selectionRect, from, to);
}
int FontCascade::offsetForPosition(const TextRun& run, float x, bool includePartialGlyphs) const
{
if (codePath(run) != Complex && (!(enableKerning() || requiresShaping())))
return offsetForPositionForSimpleText(run, x, includePartialGlyphs);
return offsetForPositionForComplexText(run, x, includePartialGlyphs);
}
template <typename CharacterType>
static inline String normalizeSpacesInternal(const CharacterType* characters, unsigned length)
{
StringBuilder normalized;
normalized.reserveCapacity(length);
for (unsigned i = 0; i < length; ++i)
normalized.append(FontCascade::normalizeSpaces(characters[i]));
return normalized.toString();
}
String FontCascade::normalizeSpaces(const LChar* characters, unsigned length)
{
return normalizeSpacesInternal(characters, length);
}
String FontCascade::normalizeSpaces(const UChar* characters, unsigned length)
{
return normalizeSpacesInternal(characters, length);
}
static bool shouldUseFontSmoothing = true;
void FontCascade::setShouldUseSmoothing(bool shouldUseSmoothing)
{
ASSERT(isMainThread());
shouldUseFontSmoothing = shouldUseSmoothing;
}
bool FontCascade::shouldUseSmoothing()
{
return shouldUseFontSmoothing;
}
void FontCascade::setCodePath(CodePath p)
{
s_codePath = p;
}
FontCascade::CodePath FontCascade::codePath()
{
return s_codePath;
}
FontCascade::CodePath FontCascade::codePath(const TextRun& run) const
{
if (s_codePath != Auto)
return s_codePath;
#if PLATFORM(COCOA)
if (m_fontDescription.featureSettings().size() > 0 || !m_fontDescription.variantSettings().isAllNormal())
return Complex;
#else
if (run.length() > 1 && (enableKerning() || requiresShaping()))
return Complex;
#endif
if (!run.characterScanForCodePath())
return Simple;
if (run.is8Bit())
return Simple;
return characterRangeCodePath(run.characters16(), run.length());
}
FontCascade::CodePath FontCascade::characterRangeCodePath(const UChar* characters, unsigned len)
{
CodePath result = Simple;
bool previousCharacterIsEmojiGroupCandidate = false;
for (unsigned i = 0; i < len; i++) {
const UChar c = characters[i];
if (c == zeroWidthJoiner && previousCharacterIsEmojiGroupCandidate)
return Complex;
previousCharacterIsEmojiGroupCandidate = false;
if (c < 0x2E5) continue;
if (c <= 0x2E9)
return Complex;
if (c < 0x300) continue;
if (c <= 0x36F)
return Complex;
if (c < 0x0591 || c == 0x05BE) continue;
if (c <= 0x05CF)
return Complex;
if (c < 0x0600)
continue;
if (c <= 0x109F)
return Complex;
if (c < 0x1100)
continue;
if (c <= 0x11FF)
return Complex;
if (c < 0x135D) continue;
if (c <= 0x135F)
return Complex;
if (c < 0x1700) continue;
if (c <= 0x18AF)
return Complex;
if (c < 0x1900) continue;
if (c <= 0x194F)
return Complex;
if (c < 0x1980) continue;
if (c <= 0x19DF)
return Complex;
if (c < 0x1A00) continue;
if (c <= 0x1CFF)
return Complex;
if (c < 0x1DC0) continue;
if (c <= 0x1DFF)
return Complex;
if (c <= 0x2000) {
result = SimpleWithGlyphOverflow;
continue;
}
if (c < 0x20D0) continue;
if (c <= 0x20FF)
return Complex;
if (c < 0x26F9)
continue;
if (c < 0x26FA)
return Complex;
if (c < 0x2CEF) continue;
if (c <= 0x2CF1)
return Complex;
if (c < 0x302A) continue;
if (c <= 0x302F)
return Complex;
if (c < 0xA67C) continue;
if (c <= 0xA67D)
return Complex;
if (c < 0xA6F0) continue;
if (c <= 0xA6F1)
return Complex;
if (c < 0xA800)
continue;
if (c <= 0xABFF)
return Complex;
if (c < 0xD7B0) continue;
if (c <= 0xD7FF)
return Complex;
if (c <= 0xDBFF) {
if (i == len - 1)
continue;
UChar next = characters[++i];
if (!U16_IS_TRAIL(next))
continue;
UChar32 supplementaryCharacter = U16_GET_SUPPLEMENTARY(c, next);
if (supplementaryCharacter < 0x1F1E6) continue;
if (supplementaryCharacter <= 0x1F1FF)
return Complex;
if (isEmojiGroupCandidate(supplementaryCharacter)) {
previousCharacterIsEmojiGroupCandidate = true;
continue;
}
if (isEmojiFitzpatrickModifier(supplementaryCharacter))
return Complex;
if (supplementaryCharacter < 0xE0100) continue;
if (supplementaryCharacter <= 0xE01EF)
return Complex;
continue;
}
if (c < 0xFE00) continue;
if (c <= 0xFE0F)
return Complex;
if (c < 0xFE20) continue;
if (c <= 0xFE2F)
return Complex;
}
return result;
}
bool FontCascade::isCJKIdeograph(UChar32 c)
{
if (c >= 0x4E00 && c <= 0x9FFF)
return true;
if (c >= 0x3400 && c <= 0x4DBF)
return true;
if (c >= 0x2E80 && c <= 0x2EFF)
return true;
if (c >= 0x2F00 && c <= 0x2FDF)
return true;
if (c >= 0x31C0 && c <= 0x31EF)
return true;
if (c >= 0xF900 && c <= 0xFAFF)
return true;
if (c >= 0x20000 && c <= 0x2A6DF)
return true;
if (c >= 0x2A700 && c <= 0x2B73F)
return true;
if (c >= 0x2B740 && c <= 0x2B81F)
return true;
if (c >= 0x2F800 && c <= 0x2FA1F)
return true;
return false;
}
bool FontCascade::isCJKIdeographOrSymbol(UChar32 c)
{
if ((c == 0x2C7) || (c == 0x2CA) || (c == 0x2CB) || (c == 0x2D9))
return true;
if ((c == 0x2020) || (c == 0x2021) || (c == 0x2030) || (c == 0x203B) || (c == 0x203C)
|| (c == 0x2042) || (c == 0x2047) || (c == 0x2048) || (c == 0x2049) || (c == 0x2051)
|| (c == 0x20DD) || (c == 0x20DE) || (c == 0x2100) || (c == 0x2103) || (c == 0x2105)
|| (c == 0x2109) || (c == 0x210A) || (c == 0x2113) || (c == 0x2116) || (c == 0x2121)
|| (c == 0x212B) || (c == 0x213B) || (c == 0x2150) || (c == 0x2151) || (c == 0x2152))
return true;
if (c >= 0x2156 && c <= 0x215A)
return true;
if (c >= 0x2160 && c <= 0x216B)
return true;
if (c >= 0x2170 && c <= 0x217B)
return true;
if ((c == 0x217F) || (c == 0x2189) || (c == 0x2307) || (c == 0x2312) || (c == 0x23BE) || (c == 0x23BF))
return true;
if (c >= 0x23C0 && c <= 0x23CC)
return true;
if ((c == 0x23CE) || (c == 0x2423))
return true;
if (c >= 0x2460 && c <= 0x2492)
return true;
if (c >= 0x249C && c <= 0x24FF)
return true;
if ((c == 0x25A0) || (c == 0x25A1) || (c == 0x25A2) || (c == 0x25AA) || (c == 0x25AB))
return true;
if ((c == 0x25B1) || (c == 0x25B2) || (c == 0x25B3) || (c == 0x25B6) || (c == 0x25B7) || (c == 0x25BC) || (c == 0x25BD))
return true;
if ((c == 0x25C0) || (c == 0x25C1) || (c == 0x25C6) || (c == 0x25C7) || (c == 0x25C9) || (c == 0x25CB) || (c == 0x25CC))
return true;
if (c >= 0x25CE && c <= 0x25D3)
return true;
if (c >= 0x25E2 && c <= 0x25E6)
return true;
if (c == 0x25EF)
return true;
if (c >= 0x2600 && c <= 0x2603)
return true;
if ((c == 0x2605) || (c == 0x2606) || (c == 0x260E) || (c == 0x2616) || (c == 0x2617) || (c == 0x2640) || (c == 0x2642))
return true;
if (c >= 0x2660 && c <= 0x266F)
return true;
if (c >= 0x2672 && c <= 0x267D)
return true;
if ((c == 0x26A0) || (c == 0x26BD) || (c == 0x26BE) || (c == 0x2713) || (c == 0x271A) || (c == 0x273F) || (c == 0x2740) || (c == 0x2756))
return true;
if (c >= 0x2776 && c <= 0x277F)
return true;
if (c == 0x2B1A)
return true;
if (c >= 0x2FF0 && c <= 0x2FFF)
return true;
if (c >= 0x3000 && c < 0x3030)
return true;
if (c > 0x3030 && c <= 0x303F)
return true;
if (c >= 0x3040 && c <= 0x309F)
return true;
if (c >= 0x30A0 && c <= 0x30FF)
return true;
if (c >= 0x3100 && c <= 0x312F)
return true;
if (c >= 0x3190 && c <= 0x319F)
return true;
if (c >= 0x31A0 && c <= 0x31BF)
return true;
if (c >= 0x3200 && c <= 0x32FF)
return true;
if (c >= 0x3300 && c <= 0x33FF)
return true;
if (c >= 0xF860 && c <= 0xF862)
return true;
if (c >= 0xFE30 && c <= 0xFE4F)
return true;
if ((c == 0xFE10) || (c == 0xFE11) || (c == 0xFE12) || (c == 0xFE19))
return true;
if ((c == 0xFF0D) || (c == 0xFF1B) || (c == 0xFF1C) || (c == 0xFF1E))
return false;
if (c >= 0xFF00 && c <= 0xFFEF)
return true;
if (c == 0x1F100)
return true;
if (c >= 0x1F110 && c <= 0x1F129)
return true;
if (c >= 0x1F130 && c <= 0x1F149)
return true;
if (c >= 0x1F150 && c <= 0x1F169)
return true;
if (c >= 0x1F170 && c <= 0x1F189)
return true;
if (c >= 0x1F200 && c <= 0x1F6C5)
return true;
return isCJKIdeograph(c);
}
std::pair<unsigned, bool> FontCascade::expansionOpportunityCountInternal(const LChar* characters, size_t length, TextDirection direction, ExpansionBehavior expansionBehavior)
{
unsigned count = 0;
bool isAfterExpansion = (expansionBehavior & LeadingExpansionMask) == ForbidLeadingExpansion;
if ((expansionBehavior & LeadingExpansionMask) == ForceLeadingExpansion) {
++count;
isAfterExpansion = true;
}
if (direction == LTR) {
for (size_t i = 0; i < length; ++i) {
if (treatAsSpace(characters[i])) {
count++;
isAfterExpansion = true;
} else
isAfterExpansion = false;
}
} else {
for (size_t i = length; i > 0; --i) {
if (treatAsSpace(characters[i - 1])) {
count++;
isAfterExpansion = true;
} else
isAfterExpansion = false;
}
}
if (!isAfterExpansion && (expansionBehavior & TrailingExpansionMask) == ForceTrailingExpansion) {
++count;
isAfterExpansion = true;
} else if (isAfterExpansion && (expansionBehavior & TrailingExpansionMask) == ForbidTrailingExpansion) {
--count;
isAfterExpansion = false;
}
return std::make_pair(count, isAfterExpansion);
}
std::pair<unsigned, bool> FontCascade::expansionOpportunityCountInternal(const UChar* characters, size_t length, TextDirection direction, ExpansionBehavior expansionBehavior)
{
static bool expandAroundIdeographs = canExpandAroundIdeographsInComplexText();
unsigned count = 0;
bool isAfterExpansion = (expansionBehavior & LeadingExpansionMask) == ForbidLeadingExpansion;
if ((expansionBehavior & LeadingExpansionMask) == ForceLeadingExpansion) {
++count;
isAfterExpansion = true;
}
if (direction == LTR) {
for (size_t i = 0; i < length; ++i) {
UChar32 character = characters[i];
if (treatAsSpace(character)) {
count++;
isAfterExpansion = true;
continue;
}
if (U16_IS_LEAD(character) && i + 1 < length && U16_IS_TRAIL(characters[i + 1])) {
character = U16_GET_SUPPLEMENTARY(character, characters[i + 1]);
i++;
}
if (expandAroundIdeographs && isCJKIdeographOrSymbol(character)) {
if (!isAfterExpansion)
count++;
count++;
isAfterExpansion = true;
continue;
}
isAfterExpansion = false;
}
} else {
for (size_t i = length; i > 0; --i) {
UChar32 character = characters[i - 1];
if (treatAsSpace(character)) {
count++;
isAfterExpansion = true;
continue;
}
if (U16_IS_TRAIL(character) && i > 1 && U16_IS_LEAD(characters[i - 2])) {
character = U16_GET_SUPPLEMENTARY(characters[i - 2], character);
i--;
}
if (expandAroundIdeographs && isCJKIdeographOrSymbol(character)) {
if (!isAfterExpansion)
count++;
count++;
isAfterExpansion = true;
continue;
}
isAfterExpansion = false;
}
}
if (!isAfterExpansion && (expansionBehavior & TrailingExpansionMask) == ForceTrailingExpansion) {
++count;
isAfterExpansion = true;
} else if (isAfterExpansion && (expansionBehavior & TrailingExpansionMask) == ForbidTrailingExpansion) {
--count;
isAfterExpansion = false;
}
return std::make_pair(count, isAfterExpansion);
}
std::pair<unsigned, bool> FontCascade::expansionOpportunityCount(const StringView& stringView, TextDirection direction, ExpansionBehavior expansionBehavior)
{
if (stringView.is8Bit())
return expansionOpportunityCountInternal(stringView.characters8(), stringView.length(), direction, expansionBehavior);
return expansionOpportunityCountInternal(stringView.characters16(), stringView.length(), direction, expansionBehavior);
}
bool FontCascade::leadingExpansionOpportunity(const StringView& stringView, TextDirection direction)
{
if (!stringView.length())
return false;
UChar32 initialCharacter;
if (direction == LTR) {
initialCharacter = stringView[0];
if (U16_IS_LEAD(initialCharacter) && stringView.length() > 1 && U16_IS_TRAIL(stringView[1]))
initialCharacter = U16_GET_SUPPLEMENTARY(initialCharacter, stringView[1]);
} else {
initialCharacter = stringView[stringView.length() - 1];
if (U16_IS_TRAIL(initialCharacter) && stringView.length() > 1 && U16_IS_LEAD(stringView[stringView.length() - 2]))
initialCharacter = U16_GET_SUPPLEMENTARY(stringView[stringView.length() - 2], initialCharacter);
}
return canExpandAroundIdeographsInComplexText() && isCJKIdeographOrSymbol(initialCharacter);
}
bool FontCascade::trailingExpansionOpportunity(const StringView& stringView, TextDirection direction)
{
if (!stringView.length())
return false;
UChar32 finalCharacter;
if (direction == LTR) {
finalCharacter = stringView[stringView.length() - 1];
if (U16_IS_TRAIL(finalCharacter) && stringView.length() > 1 && U16_IS_LEAD(stringView[stringView.length() - 2]))
finalCharacter = U16_GET_SUPPLEMENTARY(stringView[stringView.length() - 2], finalCharacter);
} else {
finalCharacter = stringView[0];
if (U16_IS_LEAD(finalCharacter) && stringView.length() > 1 && U16_IS_TRAIL(stringView[1]))
finalCharacter = U16_GET_SUPPLEMENTARY(finalCharacter, stringView[1]);
}
return treatAsSpace(finalCharacter) || (canExpandAroundIdeographsInComplexText() && isCJKIdeographOrSymbol(finalCharacter));
}
bool FontCascade::canReceiveTextEmphasis(UChar32 c)
{
if (U_GET_GC_MASK(c) & (U_GC_Z_MASK | U_GC_CN_MASK | U_GC_CC_MASK | U_GC_CF_MASK))
return false;
if (c == ethiopicWordspace || c == aegeanWordSeparatorLine || c == aegeanWordSeparatorDot
|| c == ugariticWordDivider || c == tibetanMarkIntersyllabicTsheg || c == tibetanMarkDelimiterTshegBstar)
return false;
return true;
}
bool FontCascade::isLoadingCustomFonts() const
{
return m_fonts && m_fonts->isLoadingCustomFonts();
}
GlyphToPathTranslator::GlyphUnderlineType computeUnderlineType(const TextRun& textRun, const GlyphBuffer& glyphBuffer, int index)
{
UChar32 baseCharacter;
unsigned offsetInString = glyphBuffer.offsetInString(index);
if (offsetInString == GlyphBuffer::noOffset || offsetInString >= textRun.length()) {
ASSERT_WITH_SECURITY_IMPLICATION(offsetInString < textRun.length());
return GlyphToPathTranslator::GlyphUnderlineType::DrawOverGlyph;
}
if (textRun.is8Bit())
baseCharacter = textRun.characters8()[offsetInString];
else
U16_NEXT(textRun.characters16(), offsetInString, textRun.length(), baseCharacter);
UBlockCode blockCode = ublock_getCode(baseCharacter);
switch (blockCode) {
case UBLOCK_CJK_RADICALS_SUPPLEMENT:
case UBLOCK_CJK_SYMBOLS_AND_PUNCTUATION:
case UBLOCK_ENCLOSED_CJK_LETTERS_AND_MONTHS:
case UBLOCK_CJK_COMPATIBILITY:
case UBLOCK_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A:
case UBLOCK_CJK_UNIFIED_IDEOGRAPHS:
case UBLOCK_CJK_COMPATIBILITY_IDEOGRAPHS:
case UBLOCK_CJK_COMPATIBILITY_FORMS:
case UBLOCK_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B:
case UBLOCK_CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT:
case UBLOCK_CJK_STROKES:
case UBLOCK_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C:
case UBLOCK_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D:
case UBLOCK_IDEOGRAPHIC_DESCRIPTION_CHARACTERS:
case UBLOCK_LINEAR_B_IDEOGRAMS:
case UBLOCK_ENCLOSED_IDEOGRAPHIC_SUPPLEMENT:
case UBLOCK_HIRAGANA:
case UBLOCK_KATAKANA:
case UBLOCK_BOPOMOFO:
case UBLOCK_BOPOMOFO_EXTENDED:
case UBLOCK_HANGUL_JAMO:
case UBLOCK_HANGUL_COMPATIBILITY_JAMO:
case UBLOCK_HANGUL_SYLLABLES:
case UBLOCK_HANGUL_JAMO_EXTENDED_A:
case UBLOCK_HANGUL_JAMO_EXTENDED_B:
return GlyphToPathTranslator::GlyphUnderlineType::DrawOverGlyph;
default:
return GlyphToPathTranslator::GlyphUnderlineType::SkipDescenders;
}
}
Optional<GlyphData> FontCascade::getEmphasisMarkGlyphData(const AtomicString& mark) const
{
if (mark.isEmpty())
return Nullopt;
UChar32 character;
if (!mark.is8Bit()) {
SurrogatePairAwareTextIterator iterator(mark.characters16(), 0, mark.length(), mark.length());
unsigned clusterLength;
if (!iterator.consume(character, clusterLength))
return Nullopt;
} else
character = mark[0];
Optional<GlyphData> glyphData(glyphDataForCharacter(character, false, EmphasisMarkVariant));
return glyphData.value().isValid() ? glyphData : Nullopt;
}
int FontCascade::emphasisMarkAscent(const AtomicString& mark) const
{
Optional<GlyphData> markGlyphData = getEmphasisMarkGlyphData(mark);
if (!markGlyphData)
return 0;
const Font* markFontData = markGlyphData.value().font;
ASSERT(markFontData);
if (!markFontData)
return 0;
return markFontData->fontMetrics().ascent();
}
int FontCascade::emphasisMarkDescent(const AtomicString& mark) const
{
Optional<GlyphData> markGlyphData = getEmphasisMarkGlyphData(mark);
if (!markGlyphData)
return 0;
const Font* markFontData = markGlyphData.value().font;
ASSERT(markFontData);
if (!markFontData)
return 0;
return markFontData->fontMetrics().descent();
}
int FontCascade::emphasisMarkHeight(const AtomicString& mark) const
{
Optional<GlyphData> markGlyphData = getEmphasisMarkGlyphData(mark);
if (!markGlyphData)
return 0;
const Font* markFontData = markGlyphData.value().font;
ASSERT(markFontData);
if (!markFontData)
return 0;
return markFontData->fontMetrics().height();
}
float FontCascade::getGlyphsAndAdvancesForSimpleText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
{
float initialAdvance;
WidthIterator it(this, run, 0, false, forTextEmphasis);
GlyphBuffer localGlyphBuffer;
it.advance(from, &localGlyphBuffer);
float beforeWidth = it.m_runWidthSoFar;
it.advance(to, &glyphBuffer);
if (glyphBuffer.isEmpty())
return 0;
float afterWidth = it.m_runWidthSoFar;
if (run.rtl()) {
float finalRoundingWidth = it.m_finalRoundingWidth;
it.advance(run.length(), &localGlyphBuffer);
initialAdvance = finalRoundingWidth + it.m_runWidthSoFar - afterWidth;
} else
initialAdvance = beforeWidth;
if (run.rtl())
glyphBuffer.reverse(0, glyphBuffer.size());
return initialAdvance;
}
void FontCascade::drawEmphasisMarksForSimpleText(GraphicsContext& context, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to) const
{
GlyphBuffer glyphBuffer;
float initialAdvance = getGlyphsAndAdvancesForSimpleText(run, from, to, glyphBuffer, ForTextEmphasis);
if (glyphBuffer.isEmpty())
return;
drawEmphasisMarks(context, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y()));
}
void FontCascade::drawGlyphBuffer(GraphicsContext& context, const GlyphBuffer& glyphBuffer, FloatPoint& point) const
{
const Font* fontData = glyphBuffer.fontAt(0);
FloatSize offset = glyphBuffer.offsetAt(0);
FloatPoint startPoint(point.x(), point.y() - glyphBuffer.initialAdvance().height());
float nextX = startPoint.x() + glyphBuffer.advanceAt(0).width();
float nextY = startPoint.y() + glyphBuffer.advanceAt(0).height();
int lastFrom = 0;
int nextGlyph = 1;
while (nextGlyph < glyphBuffer.size()) {
const Font* nextFontData = glyphBuffer.fontAt(nextGlyph);
FloatSize nextOffset = glyphBuffer.offsetAt(nextGlyph);
if (nextFontData != fontData || nextOffset != offset) {
context.drawGlyphs(*this, *fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
lastFrom = nextGlyph;
fontData = nextFontData;
offset = nextOffset;
startPoint.setX(nextX);
startPoint.setY(nextY);
}
nextX += glyphBuffer.advanceAt(nextGlyph).width();
nextY += glyphBuffer.advanceAt(nextGlyph).height();
nextGlyph++;
}
context.drawGlyphs(*this, *fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
point.setX(nextX);
}
inline static float offsetToMiddleOfGlyph(const Font* fontData, Glyph glyph)
{
if (fontData->platformData().orientation() == Horizontal) {
FloatRect bounds = fontData->boundsForGlyph(glyph);
return bounds.x() + bounds.width() / 2;
}
return fontData->widthForGlyph(glyph) / 2;
}
inline static float offsetToMiddleOfGlyphAtIndex(const GlyphBuffer& glyphBuffer, size_t i)
{
return offsetToMiddleOfGlyph(glyphBuffer.fontAt(i), glyphBuffer.glyphAt(i));
}
void FontCascade::drawEmphasisMarks(GraphicsContext& context, const GlyphBuffer& glyphBuffer, const AtomicString& mark, const FloatPoint& point) const
{
Optional<GlyphData> markGlyphData = getEmphasisMarkGlyphData(mark);
if (!markGlyphData)
return;
const Font* markFontData = markGlyphData.value().font;
ASSERT(markFontData);
if (!markFontData)
return;
Glyph markGlyph = markGlyphData.value().glyph;
Glyph spaceGlyph = markFontData->spaceGlyph();
float middleOfLastGlyph = offsetToMiddleOfGlyphAtIndex(glyphBuffer, 0);
FloatPoint startPoint(point.x() + middleOfLastGlyph - offsetToMiddleOfGlyph(markFontData, markGlyph), point.y());
GlyphBuffer markBuffer;
for (int i = 0; i + 1 < glyphBuffer.size(); ++i) {
float middleOfNextGlyph = offsetToMiddleOfGlyphAtIndex(glyphBuffer, i + 1);
float advance = glyphBuffer.advanceAt(i).width() - middleOfLastGlyph + middleOfNextGlyph;
markBuffer.add(glyphBuffer.glyphAt(i) ? markGlyph : spaceGlyph, markFontData, advance);
middleOfLastGlyph = middleOfNextGlyph;
}
markBuffer.add(glyphBuffer.glyphAt(glyphBuffer.size() - 1) ? markGlyph : spaceGlyph, markFontData, 0);
drawGlyphBuffer(context, markBuffer, startPoint);
}
float FontCascade::floatWidthForSimpleText(const TextRun& run, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
WidthIterator it(this, run, fallbackFonts, glyphOverflow);
GlyphBuffer glyphBuffer;
it.advance(run.length(), (enableKerning() || requiresShaping()) ? &glyphBuffer : nullptr);
if (glyphOverflow) {
glyphOverflow->top = std::max<int>(glyphOverflow->top, ceilf(-it.minGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent()));
glyphOverflow->bottom = std::max<int>(glyphOverflow->bottom, ceilf(it.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().descent()));
glyphOverflow->left = ceilf(it.firstGlyphOverflow());
glyphOverflow->right = ceilf(it.lastGlyphOverflow());
}
return it.m_runWidthSoFar;
}
void FontCascade::adjustSelectionRectForSimpleText(const TextRun& run, LayoutRect& selectionRect, int from, int to) const
{
GlyphBuffer glyphBuffer;
WidthIterator it(this, run);
it.advance(from, &glyphBuffer);
float beforeWidth = it.m_runWidthSoFar;
it.advance(to, &glyphBuffer);
float afterWidth = it.m_runWidthSoFar;
float totalWidth = -1;
if (run.rtl()) {
it.advance(run.length(), &glyphBuffer);
totalWidth = it.m_runWidthSoFar;
selectionRect.move(totalWidth - afterWidth, 0);
} else
selectionRect.move(beforeWidth, 0);
selectionRect.setWidth(LayoutUnit::fromFloatCeil(afterWidth - beforeWidth));
}
int FontCascade::offsetForPositionForSimpleText(const TextRun& run, float x, bool includePartialGlyphs) const
{
float delta = x;
WidthIterator it(this, run);
GlyphBuffer localGlyphBuffer;
unsigned offset;
if (run.rtl()) {
delta -= floatWidthForSimpleText(run);
while (1) {
offset = it.m_currentCharacter;
float w;
if (!it.advanceOneCharacter(w, localGlyphBuffer))
break;
delta += w;
if (includePartialGlyphs) {
if (delta - w / 2 >= 0)
break;
} else {
if (delta >= 0)
break;
}
}
} else {
while (1) {
offset = it.m_currentCharacter;
float w;
if (!it.advanceOneCharacter(w, localGlyphBuffer))
break;
delta -= w;
if (includePartialGlyphs) {
if (delta + w / 2 <= 0)
break;
} else {
if (delta <= 0)
break;
}
}
}
return offset;
}
}