| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2003, 2006, 2010, 2011 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "platform/fonts/Font.h" |
| |
| #include "platform/fonts/WidthIterator.h" |
| #include "platform/geometry/FloatRect.h" |
| #include "platform/text/TextRun.h" |
| #include "wtf/MainThread.h" |
| #include "wtf/StdLibExtras.h" |
| #include "wtf/text/StringBuilder.h" |
| |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace WTF { |
| |
| // allow compilation of OwnPtr<TextLayout> in source files that don't have access to the TextLayout class definition |
| void OwnedPtrDeleter<WebCore::TextLayout>::deletePtr(WebCore::TextLayout* ptr) |
| { |
| WebCore::Font::deleteLayout(ptr); |
| } |
| |
| } |
| |
| namespace WebCore { |
| |
| const uint8_t Font::s_roundingHackCharacterTable[256] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*\t*/, 1 /*\n*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1 /*space*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*-*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*?*/, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1 /*no-break space*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| }; |
| |
| static const UChar32 cjkIsolatedSymbolsArray[] = { |
| // 0x2C7 Caron, Mandarin Chinese 3rd Tone |
| 0x2C7, |
| // 0x2CA Modifier Letter Acute Accent, Mandarin Chinese 2nd Tone |
| 0x2CA, |
| // 0x2CB Modifier Letter Grave Access, Mandarin Chinese 4th Tone |
| 0x2CB, |
| // 0x2D9 Dot Above, Mandarin Chinese 5th Tone |
| 0x2D9, |
| 0x2020, 0x2021, 0x2030, 0x203B, 0x203C, 0x2042, 0x2047, 0x2048, 0x2049, 0x2051, |
| 0x20DD, 0x20DE, 0x2100, 0x2103, 0x2105, 0x2109, 0x210A, 0x2113, 0x2116, 0x2121, |
| 0x212B, 0x213B, 0x2150, 0x2151, 0x2152, 0x217F, 0x2189, 0x2307, 0x2312, 0x23CE, |
| 0x2423, 0x25A0, 0x25A1, 0x25A2, 0x25AA, 0x25AB, 0x25B1, 0x25B2, 0x25B3, 0x25B6, |
| 0x25B7, 0x25BC, 0x25BD, 0x25C0, 0x25C1, 0x25C6, 0x25C7, 0x25C9, 0x25CB, 0x25CC, |
| 0x25EF, 0x2605, 0x2606, 0x260E, 0x2616, 0x2617, 0x2640, 0x2642, 0x26A0, 0x26BD, |
| 0x26BE, 0x2713, 0x271A, 0x273F, 0x2740, 0x2756, 0x2B1A, 0xFE10, 0xFE11, 0xFE12, |
| 0xFE19, 0xFF1D, |
| // Emoji. |
| 0x1F100 |
| }; |
| |
| Font::CodePath Font::s_codePath = Auto; |
| |
| TypesettingFeatures Font::s_defaultTypesettingFeatures = 0; |
| |
| // ============================================================================================ |
| // Font Implementation (Cross-Platform Portion) |
| // ============================================================================================ |
| |
| Font::Font() |
| : m_letterSpacing(0) |
| , m_wordSpacing(0) |
| , m_isPlatformFont(false) |
| , m_typesettingFeatures(0) |
| { |
| } |
| |
| Font::Font(const FontDescription& fd, float letterSpacing, float wordSpacing) |
| : m_fontDescription(fd) |
| , m_letterSpacing(letterSpacing) |
| , m_wordSpacing(wordSpacing) |
| , m_isPlatformFont(false) |
| , m_typesettingFeatures(computeTypesettingFeatures()) |
| { |
| } |
| |
| Font::Font(const FontPlatformData& fontData, bool isPrinterFont, FontSmoothingMode fontSmoothingMode) |
| : m_fontFallbackList(FontFallbackList::create()) |
| , m_letterSpacing(0) |
| , m_wordSpacing(0) |
| , m_isPlatformFont(true) |
| , m_typesettingFeatures(computeTypesettingFeatures()) |
| { |
| m_fontDescription.setUsePrinterFont(isPrinterFont); |
| m_fontDescription.setFontSmoothing(fontSmoothingMode); |
| m_fontFallbackList->setPlatformFont(fontData); |
| } |
| |
| Font::Font(const Font& other) |
| : m_fontDescription(other.m_fontDescription) |
| , m_fontFallbackList(other.m_fontFallbackList) |
| , m_letterSpacing(other.m_letterSpacing) |
| , m_wordSpacing(other.m_wordSpacing) |
| , m_isPlatformFont(other.m_isPlatformFont) |
| , m_typesettingFeatures(computeTypesettingFeatures()) |
| { |
| } |
| |
| Font& Font::operator=(const Font& other) |
| { |
| m_fontDescription = other.m_fontDescription; |
| m_fontFallbackList = other.m_fontFallbackList; |
| m_letterSpacing = other.m_letterSpacing; |
| m_wordSpacing = other.m_wordSpacing; |
| m_isPlatformFont = other.m_isPlatformFont; |
| m_typesettingFeatures = other.m_typesettingFeatures; |
| return *this; |
| } |
| |
| bool Font::operator==(const Font& other) const |
| { |
| // Our FontData don't have to be checked, since checking the font description will be fine. |
| // FIXME: This does not work if the font was made with the FontPlatformData constructor. |
| if (loadingCustomFonts() || other.loadingCustomFonts()) |
| return false; |
| |
| FontSelector* first = m_fontFallbackList ? m_fontFallbackList->fontSelector() : 0; |
| FontSelector* second = other.m_fontFallbackList ? other.m_fontFallbackList->fontSelector() : 0; |
| |
| return first == second |
| && m_fontDescription == other.m_fontDescription |
| && m_letterSpacing == other.m_letterSpacing |
| && m_wordSpacing == other.m_wordSpacing |
| && (m_fontFallbackList ? m_fontFallbackList->fontSelectorVersion() : 0) == (other.m_fontFallbackList ? other.m_fontFallbackList->fontSelectorVersion() : 0) |
| && (m_fontFallbackList ? m_fontFallbackList->generation() : 0) == (other.m_fontFallbackList ? other.m_fontFallbackList->generation() : 0); |
| } |
| |
| void Font::update(PassRefPtr<FontSelector> fontSelector) const |
| { |
| // FIXME: It is pretty crazy that we are willing to just poke into a RefPtr, but it ends up |
| // being reasonably safe (because inherited fonts in the render tree pick up the new |
| // style anyway. Other copies are transient, e.g., the state in the GraphicsContext, and |
| // won't stick around long enough to get you in trouble). Still, this is pretty disgusting, |
| // and could eventually be rectified by using RefPtrs for Fonts themselves. |
| if (!m_fontFallbackList) |
| m_fontFallbackList = FontFallbackList::create(); |
| m_fontFallbackList->invalidate(fontSelector); |
| m_typesettingFeatures = computeTypesettingFeatures(); |
| } |
| |
| void Font::drawText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const FloatPoint& point, CustomFontNotReadyAction customFontNotReadyAction) const |
| { |
| // Don't draw anything while we are using custom fonts that are in the process of loading, |
| // except if the 'force' argument is set to true (in which case it will use a fallback |
| // font). |
| if (loadingCustomFonts() && customFontNotReadyAction == DoNotPaintIfFontNotReady) |
| return; |
| |
| CodePath codePathToUse = codePath(runInfo.run); |
| // FIXME: Use the fast code path once it handles partial runs with kerning and ligatures. See http://webkit.org/b/100050 |
| if (codePathToUse != Complex && typesettingFeatures() && (runInfo.from || runInfo.to != runInfo.run.length())) |
| codePathToUse = Complex; |
| |
| if (codePathToUse != Complex) |
| return drawSimpleText(context, runInfo, point); |
| |
| return drawComplexText(context, runInfo, point); |
| } |
| |
| void Font::drawEmphasisMarks(GraphicsContext* context, const TextRunPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point) const |
| { |
| if (loadingCustomFonts()) |
| return; |
| |
| CodePath codePathToUse = codePath(runInfo.run); |
| // FIXME: Use the fast code path once it handles partial runs with kerning and ligatures. See http://webkit.org/b/100050 |
| if (codePathToUse != Complex && typesettingFeatures() && (runInfo.from || runInfo.to != runInfo.run.length())) |
| codePathToUse = Complex; |
| |
| if (codePathToUse != Complex) |
| drawEmphasisMarksForSimpleText(context, runInfo, mark, point); |
| else |
| drawEmphasisMarksForComplexText(context, runInfo, mark, point); |
| } |
| |
| float Font::width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| CodePath codePathToUse = codePath(run); |
| if (codePathToUse != Complex) { |
| // The complex path is more restrictive about returning fallback fonts than the simple path, so we need an explicit test to make their behaviors match. |
| if (!canReturnFallbackFontsForComplexText()) |
| fallbackFonts = 0; |
| // The simple path can optimize the case where glyph overflow is not observable. |
| if (codePathToUse != SimpleWithGlyphOverflow && (glyphOverflow && !glyphOverflow->computeBounds)) |
| glyphOverflow = 0; |
| } |
| |
| bool hasKerningOrLigatures = typesettingFeatures() & (Kerning | Ligatures); |
| bool hasWordSpacingOrLetterSpacing = wordSpacing() || letterSpacing(); |
| float* cacheEntry = m_fontFallbackList->widthCache().add(run, std::numeric_limits<float>::quiet_NaN(), hasKerningOrLigatures, hasWordSpacingOrLetterSpacing, glyphOverflow); |
| if (cacheEntry && !std::isnan(*cacheEntry)) |
| return *cacheEntry; |
| |
| float result; |
| if (codePathToUse == Complex) |
| result = floatWidthForComplexText(run, fallbackFonts, glyphOverflow); |
| else |
| result = floatWidthForSimpleText(run, fallbackFonts, glyphOverflow); |
| |
| if (cacheEntry && (!fallbackFonts || fallbackFonts->isEmpty())) |
| *cacheEntry = result; |
| return result; |
| } |
| |
| float Font::width(const TextRun& run, int& charsConsumed, String& glyphName) const |
| { |
| #if ENABLE(SVG_FONTS) |
| if (TextRun::RenderingContext* renderingContext = run.renderingContext()) |
| return renderingContext->floatWidthUsingSVGFont(*this, run, charsConsumed, glyphName); |
| #endif |
| |
| charsConsumed = run.length(); |
| glyphName = ""; |
| return width(run); |
| } |
| |
| #if !OS(MACOSX) |
| |
| PassOwnPtr<TextLayout> Font::createLayoutForMacComplexText(const TextRun&, unsigned, float, bool) const |
| { |
| ASSERT_NOT_REACHED(); |
| return nullptr; |
| } |
| |
| void Font::deleteLayout(TextLayout*) |
| { |
| } |
| |
| float Font::width(TextLayout&, unsigned, unsigned, HashSet<const SimpleFontData*>*) |
| { |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| #endif |
| |
| FloatRect Font::selectionRectForText(const TextRun& run, const FloatPoint& point, int h, int from, int to) const |
| { |
| to = (to == -1 ? run.length() : to); |
| |
| CodePath codePathToUse = codePath(run); |
| // FIXME: Use the fast code path once it handles partial runs with kerning and ligatures. See http://webkit.org/b/100050 |
| if (codePathToUse != Complex && typesettingFeatures() && (from || to != run.length())) |
| codePathToUse = Complex; |
| |
| if (codePathToUse != Complex) |
| return selectionRectForSimpleText(run, point, h, from, to); |
| |
| return selectionRectForComplexText(run, point, h, from, to); |
| } |
| |
| int Font::offsetForPosition(const TextRun& run, float x, bool includePartialGlyphs) const |
| { |
| // FIXME: Use the fast code path once it handles partial runs with kerning and ligatures. See http://webkit.org/b/100050 |
| if (codePath(run) != Complex && !typesettingFeatures()) |
| 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(Font::normalizeSpaces(characters[i])); |
| |
| return normalized.toString(); |
| } |
| |
| String Font::normalizeSpaces(const LChar* characters, unsigned length) |
| { |
| return normalizeSpacesInternal(characters, length); |
| } |
| |
| String Font::normalizeSpaces(const UChar* characters, unsigned length) |
| { |
| return normalizeSpacesInternal(characters, length); |
| } |
| |
| static bool shouldUseFontSmoothing = true; |
| |
| void Font::setShouldUseSmoothing(bool shouldUseSmoothing) |
| { |
| ASSERT(isMainThread()); |
| shouldUseFontSmoothing = shouldUseSmoothing; |
| } |
| |
| bool Font::shouldUseSmoothing() |
| { |
| return shouldUseFontSmoothing; |
| } |
| |
| void Font::setCodePath(CodePath p) |
| { |
| s_codePath = p; |
| } |
| |
| Font::CodePath Font::codePath() |
| { |
| return s_codePath; |
| } |
| |
| void Font::setDefaultTypesettingFeatures(TypesettingFeatures typesettingFeatures) |
| { |
| s_defaultTypesettingFeatures = typesettingFeatures; |
| } |
| |
| TypesettingFeatures Font::defaultTypesettingFeatures() |
| { |
| return s_defaultTypesettingFeatures; |
| } |
| |
| Font::CodePath Font::codePath(const TextRun& run) const |
| { |
| if (s_codePath != Auto) |
| return s_codePath; |
| |
| #if ENABLE(SVG_FONTS) |
| if (run.renderingContext()) |
| return Simple; |
| #endif |
| |
| if (m_fontDescription.featureSettings() && m_fontDescription.featureSettings()->size() > 0) |
| return Complex; |
| |
| if (run.length() > 1 && !WidthIterator::supportsTypesettingFeatures(*this)) |
| return Complex; |
| |
| if (!run.characterScanForCodePath()) |
| return Simple; |
| |
| if (run.is8Bit()) |
| return Simple; |
| |
| // Start from 0 since drawing and highlighting also measure the characters before run->from. |
| return characterRangeCodePath(run.characters16(), run.length()); |
| } |
| |
| static inline UChar keyExtractorUChar(const UChar* value) |
| { |
| return *value; |
| } |
| |
| static inline UChar32 keyExtractorUChar32(const UChar32* value) |
| { |
| return *value; |
| } |
| |
| Font::CodePath Font::characterRangeCodePath(const UChar* characters, unsigned len) |
| { |
| static const UChar complexCodePathRanges[] = { |
| // U+02E5 through U+02E9 (Modifier Letters : Tone letters) |
| 0x2E5, 0x2E9, |
| // U+0300 through U+036F Combining diacritical marks |
| 0x300, 0x36F, |
| // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, ... |
| 0x0591, 0x05BD, |
| // ... Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha |
| 0x05BF, 0x05CF, |
| // U+0600 through U+109F Arabic, Syriac, Thaana, NKo, Samaritan, Mandaic, |
| // Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, |
| // Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar |
| 0x0600, 0x109F, |
| // U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left |
| // here if you precompose; Modern Korean will be precomposed as a result of step A) |
| 0x1100, 0x11FF, |
| // U+135D through U+135F Ethiopic combining marks |
| 0x135D, 0x135F, |
| // U+1780 through U+18AF Tagalog, Hanunoo, Buhid, Taghanwa,Khmer, Mongolian |
| 0x1700, 0x18AF, |
| // U+1900 through U+194F Limbu (Unicode 4.0) |
| 0x1900, 0x194F, |
| // U+1980 through U+19DF New Tai Lue |
| 0x1980, 0x19DF, |
| // U+1A00 through U+1CFF Buginese, Tai Tham, Balinese, Batak, Lepcha, Vedic |
| 0x1A00, 0x1CFF, |
| // U+1DC0 through U+1DFF Comining diacritical mark supplement |
| 0x1DC0, 0x1DFF, |
| // U+20D0 through U+20FF Combining marks for symbols |
| 0x20D0, 0x20FF, |
| // U+2CEF through U+2CF1 Combining marks for Coptic |
| 0x2CEF, 0x2CF1, |
| // U+302A through U+302F Ideographic and Hangul Tone marks |
| 0x302A, 0x302F, |
| // U+A67C through U+A67D Combining marks for old Cyrillic |
| 0xA67C, 0xA67D, |
| // U+A6F0 through U+A6F1 Combining mark for Bamum |
| 0xA6F0, 0xA6F1, |
| // U+A800 through U+ABFF Nagri, Phags-pa, Saurashtra, Devanagari Extended, |
| // Hangul Jamo Ext. A, Javanese, Myanmar Extended A, Tai Viet, Meetei Mayek |
| 0xA800, 0xABFF, |
| // U+D7B0 through U+D7FF Hangul Jamo Ext. B |
| 0xD7B0, 0xD7FF, |
| // U+FE00 through U+FE0F Unicode variation selectors |
| 0xFE00, 0xFE0F, |
| // U+FE20 through U+FE2F Combining half marks |
| 0xFE20, 0xFE2F |
| }; |
| static size_t complexCodePathRangesCount = WTF_ARRAY_LENGTH(complexCodePathRanges); |
| |
| CodePath result = Simple; |
| for (unsigned i = 0; i < len; i++) { |
| const UChar c = characters[i]; |
| |
| // Shortcut for common case |
| if (c < 0x2E5) |
| continue; |
| |
| // U+1E00 through U+2000 characters with diacritics and stacked diacritics |
| if (c >= 0x1E00 && c <= 0x2000) { |
| result = SimpleWithGlyphOverflow; |
| continue; |
| } |
| |
| // Surrogate pairs |
| if (c > 0xD7FF && 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) // U+1F1E6 through U+1F1FF Regional Indicator Symbols |
| continue; |
| if (supplementaryCharacter <= 0x1F1FF) |
| return Complex; |
| |
| if (supplementaryCharacter < 0xE0100) // U+E0100 through U+E01EF Unicode variation selectors. |
| continue; |
| if (supplementaryCharacter <= 0xE01EF) |
| return Complex; |
| |
| // FIXME: Check for Brahmi (U+11000 block), Kaithi (U+11080 block) and other complex scripts |
| // in plane 1 or higher. |
| |
| continue; |
| } |
| |
| // Search for other Complex cases |
| UChar* boundingCharacter = approximateBinarySearch<UChar, UChar>( |
| (UChar*)complexCodePathRanges, complexCodePathRangesCount, c, keyExtractorUChar); |
| // Exact matches are complex |
| if (*boundingCharacter == c) |
| return Complex; |
| bool isEndOfRange = ((boundingCharacter - complexCodePathRanges) % 2); |
| if (*boundingCharacter < c) { |
| // Determine if we are in a range or out |
| if (!isEndOfRange) |
| return Complex; |
| continue; |
| } |
| ASSERT(*boundingCharacter > c); |
| // Determine if we are in a range or out - opposite condition to above |
| if (isEndOfRange) |
| return Complex; |
| } |
| |
| return result; |
| } |
| |
| bool Font::isCJKIdeograph(UChar32 c) |
| { |
| static const UChar32 cjkIdeographRanges[] = { |
| // CJK Radicals Supplement and Kangxi Radicals. |
| 0x2E80, 0x2FDF, |
| // CJK Strokes. |
| 0x31C0, 0x31EF, |
| // CJK Unified Ideographs Extension A. |
| 0x3400, 0x4DBF, |
| // The basic CJK Unified Ideographs block. |
| 0x4E00, 0x9FFF, |
| // CJK Compatibility Ideographs. |
| 0xF900, 0xFAFF, |
| // CJK Unified Ideographs Extension B. |
| 0x20000, 0x2A6DF, |
| // CJK Unified Ideographs Extension C. |
| // CJK Unified Ideographs Extension D. |
| 0x2A700, 0x2B81F, |
| // CJK Compatibility Ideographs Supplement. |
| 0x2F800, 0x2FA1F |
| }; |
| static size_t cjkIdeographRangesCount = WTF_ARRAY_LENGTH(cjkIdeographRanges); |
| |
| // Early out |
| if (c < cjkIdeographRanges[0] || c > cjkIdeographRanges[cjkIdeographRangesCount - 1]) |
| return false; |
| |
| UChar32* boundingCharacter = approximateBinarySearch<UChar32, UChar32>( |
| (UChar32*)cjkIdeographRanges, cjkIdeographRangesCount, c, keyExtractorUChar32); |
| // Exact matches are CJK |
| if (*boundingCharacter == c) |
| return true; |
| bool isEndOfRange = ((boundingCharacter - cjkIdeographRanges) % 2); |
| if (*boundingCharacter < c) |
| return !isEndOfRange; |
| return isEndOfRange; |
| } |
| |
| bool Font::isCJKIdeographOrSymbol(UChar32 c) |
| { |
| // Likely common case |
| if (c < 0x2C7) |
| return false; |
| |
| // Hash lookup for isolated symbols (those not part of a contiguous range) |
| static HashSet<UChar32>* cjkIsolatedSymbols = 0; |
| if (!cjkIsolatedSymbols) { |
| cjkIsolatedSymbols = new HashSet<UChar32>(); |
| for (size_t i = 0; i < WTF_ARRAY_LENGTH(cjkIsolatedSymbolsArray); ++i) |
| cjkIsolatedSymbols->add(cjkIsolatedSymbolsArray[i]); |
| } |
| if (cjkIsolatedSymbols->contains(c)) |
| return true; |
| |
| if (isCJKIdeograph(c)) |
| return true; |
| |
| static const UChar32 cjkSymbolRanges[] = { |
| 0x2156, 0x215A, |
| 0x2160, 0x216B, |
| 0x2170, 0x217B, |
| 0x23BE, 0x23CC, |
| 0x2460, 0x2492, |
| 0x249C, 0x24FF, |
| 0x25CE, 0x25D3, |
| 0x25E2, 0x25E6, |
| 0x2600, 0x2603, |
| 0x2660, 0x266F, |
| 0x2672, 0x267D, |
| 0x2776, 0x277F, |
| // Ideographic Description Characters, with CJK Symbols and Punctuation, excluding 0x3030. |
| // Then Hiragana 0x3040 .. 0x309F, Katakana 0x30A0 .. 0x30FF, Bopomofo 0x3100 .. 0x312F |
| 0x2FF0, 0x302F, |
| 0x3031, 0x312F, |
| // More Bopomofo and Bopomofo Extended 0x31A0 .. 0x31BF |
| 0x3190, 0x31BF, |
| // Enclosed CJK Letters and Months (0x3200 .. 0x32FF). |
| // CJK Compatibility (0x3300 .. 0x33FF). |
| 0x3200, 0x33FF, |
| 0xF860, 0xF862, |
| // CJK Compatibility Forms. |
| 0xFE30, 0xFE4F, |
| // Halfwidth and Fullwidth Forms |
| // Usually only used in CJK |
| 0xFF00, 0xFF0C, |
| 0xFF0E, 0xFF1A, |
| 0xFF1F, 0xFFEF, |
| // Emoji. |
| 0x1F110, 0x1F129, |
| 0x1F130, 0x1F149, |
| 0x1F150, 0x1F169, |
| 0x1F170, 0x1F189, |
| 0x1F200, 0x1F6FF |
| }; |
| static size_t cjkSymbolRangesCount = WTF_ARRAY_LENGTH(cjkSymbolRanges); |
| |
| UChar32* boundingCharacter = approximateBinarySearch<UChar32, UChar32>( |
| (UChar32*)cjkSymbolRanges, cjkSymbolRangesCount, c, keyExtractorUChar32); |
| // Exact matches are CJK Symbols |
| if (*boundingCharacter == c) |
| return true; |
| bool isEndOfRange = ((boundingCharacter - cjkSymbolRanges) % 2); |
| if (*boundingCharacter < c) |
| return !isEndOfRange; |
| return isEndOfRange; |
| } |
| |
| unsigned Font::expansionOpportunityCount(const LChar* characters, size_t length, TextDirection direction, bool& isAfterExpansion) |
| { |
| unsigned count = 0; |
| 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; |
| } |
| } |
| return count; |
| } |
| |
| unsigned Font::expansionOpportunityCount(const UChar* characters, size_t length, TextDirection direction, bool& isAfterExpansion) |
| { |
| static bool expandAroundIdeographs = canExpandAroundIdeographsInComplexText(); |
| unsigned count = 0; |
| 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; |
| } |
| } |
| return count; |
| } |
| |
| bool Font::canReceiveTextEmphasis(UChar32 c) |
| { |
| CharCategory category = Unicode::category(c); |
| if (category & (Separator_Space | Separator_Line | Separator_Paragraph | Other_NotAssigned | Other_Control | Other_Format)) |
| return false; |
| |
| // Additional word-separator characters listed in CSS Text Level 3 Editor's Draft 3 November 2010. |
| if (c == ethiopicWordspace || c == aegeanWordSeparatorLine || c == aegeanWordSeparatorDot |
| || c == ugariticWordDivider || c == tibetanMarkIntersyllabicTsheg || c == tibetanMarkDelimiterTshegBstar) |
| return false; |
| |
| return true; |
| } |
| |
| void Font::willUseFontData() const |
| { |
| const FontFamily& family = fontDescription().family(); |
| if (m_fontFallbackList && m_fontFallbackList->fontSelector() && !family.familyIsEmpty()) |
| m_fontFallbackList->fontSelector()->willUseFontData(fontDescription(), family.family()); |
| } |
| |
| } |
