| /* |
| * Copyright (c) 2006, 2007, 2008, 2009, 2010, 2012 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "platform/fonts/win/FontFallbackWin.h" |
| |
| #include "SkFontMgr.h" |
| #include "SkTypeface.h" |
| #include "wtf/HashMap.h" |
| #include "wtf/text/StringHash.h" |
| #include "wtf/text/WTFString.h" |
| #include <limits> |
| #include <unicode/locid.h> |
| #include <unicode/uchar.h> |
| |
| namespace WebCore { |
| |
| namespace { |
| |
| static inline bool isFontPresent(const UChar* fontName, SkFontMgr* fontManager) |
| { |
| String family = fontName; |
| RefPtr<SkTypeface> tf = adoptRef(fontManager->legacyCreateTypeface(family.utf8().data(), SkTypeface::kNormal)); |
| if (!tf) |
| return false; |
| |
| SkTypeface::LocalizedStrings* actualFamilies = tf->createFamilyNameIterator(); |
| bool matchesRequestedFamily = false; |
| SkTypeface::LocalizedString actualFamily; |
| while (actualFamilies->next(&actualFamily)) { |
| if (equalIgnoringCase(family, AtomicString::fromUTF8(actualFamily.fString.c_str()))) { |
| matchesRequestedFamily = true; |
| break; |
| } |
| } |
| actualFamilies->unref(); |
| |
| return matchesRequestedFamily; |
| } |
| |
| // A simple mapping from UScriptCode to family name. This is a sparse array, |
| // which works well since the range of UScriptCode values is small. |
| typedef const UChar* ScriptToFontMap[USCRIPT_CODE_LIMIT]; |
| |
| void initializeScriptMonospaceFontMap(ScriptToFontMap& scriptFontMap, SkFontMgr* fontManager) |
| { |
| struct FontMap { |
| UScriptCode script; |
| const UChar* family; |
| }; |
| |
| static const FontMap fontMap[] = { |
| { USCRIPT_HEBREW, L"courier new" }, |
| { USCRIPT_ARABIC, L"courier new" }, |
| }; |
| |
| for (size_t i = 0; i < WTF_ARRAY_LENGTH(fontMap); ++i) |
| scriptFontMap[fontMap[i].script] = fontMap[i].family; |
| } |
| |
| void initializeScriptFontMap(ScriptToFontMap& scriptFontMap, SkFontMgr* fontManager) |
| { |
| struct FontMap { |
| UScriptCode script; |
| const UChar* family; |
| }; |
| |
| static const FontMap fontMap[] = { |
| {USCRIPT_LATIN, L"times new roman"}, |
| {USCRIPT_GREEK, L"times new roman"}, |
| {USCRIPT_CYRILLIC, L"times new roman"}, |
| // FIXME: Consider trying new Vista fonts before XP fonts for CJK. |
| // Some Vista users do want to use Vista cleartype CJK fonts. If we |
| // did, the results of tests with CJK characters would have to be |
| // regenerated for Vista. |
| {USCRIPT_SIMPLIFIED_HAN, L"simsun"}, |
| {USCRIPT_TRADITIONAL_HAN, L"pmingliu"}, |
| {USCRIPT_HIRAGANA, L"ms pgothic"}, |
| {USCRIPT_KATAKANA, L"ms pgothic"}, |
| {USCRIPT_KATAKANA_OR_HIRAGANA, L"ms pgothic"}, |
| {USCRIPT_HANGUL, L"gulim"}, |
| {USCRIPT_THAI, L"tahoma"}, |
| {USCRIPT_HEBREW, L"david"}, |
| {USCRIPT_ARABIC, L"tahoma"}, |
| {USCRIPT_DEVANAGARI, L"mangal"}, |
| {USCRIPT_BENGALI, L"vrinda"}, |
| {USCRIPT_GURMUKHI, L"raavi"}, |
| {USCRIPT_GUJARATI, L"shruti"}, |
| {USCRIPT_TAMIL, L"latha"}, |
| {USCRIPT_TELUGU, L"gautami"}, |
| {USCRIPT_KANNADA, L"tunga"}, |
| {USCRIPT_GEORGIAN, L"sylfaen"}, |
| {USCRIPT_ARMENIAN, L"sylfaen"}, |
| {USCRIPT_THAANA, L"mv boli"}, |
| {USCRIPT_CANADIAN_ABORIGINAL, L"euphemia"}, |
| {USCRIPT_CHEROKEE, L"plantagenet cherokee"}, |
| {USCRIPT_MONGOLIAN, L"mongolian balti"}, |
| // For USCRIPT_COMMON, we map blocks to scripts when |
| // that makes sense. |
| }; |
| |
| struct ScriptToFontFamilies { |
| UScriptCode script; |
| const UChar** families; |
| }; |
| |
| // Kartika on Vista or earlier lacks the support for Chillu |
| // letters added to Unicode 5.1. |
| // Try AnjaliOldLipi (a very widely used Malaylalam font with the full |
| // Unicode 5.x support) before falling back to Kartika. |
| static const UChar* malayalamFonts[] = {L"AnjaliOldLipi", L"Lohit Malayalam", L"Kartika", L"Rachana", 0}; |
| // Try Khmer OS before Vista fonts because 'Khmer OS' goes along better |
| // with Latin and looks better/larger for the same size. |
| static const UChar* khmerFonts[] = {L"Khmer OS", L"MoolBoran", L"DaunPenh", L"Code2000", 0}; |
| // For the following 6 scripts, two or fonts are listed. The fonts in |
| // the 1st slot are not available on Windows XP. To support these |
| // scripts on XP, listed in the rest of slots are widely used |
| // fonts. |
| static const UChar* ethiopicFonts[] = {L"Nyala", L"Abyssinica SIL", L"Ethiopia Jiret", L"Visual Geez Unicode", L"GF Zemen Unicode", 0}; |
| static const UChar* oriyaFonts[] = {L"Kalinga", L"ori1Uni", L"Lohit Oriya", 0}; |
| static const UChar* laoFonts[] = {L"DokChampa", L"Saysettha OT", L"Phetsarath OT", L"Code2000", 0}; |
| static const UChar* tibetanFonts[] = {L"Microsoft Himalaya", L"Jomolhari", L"Tibetan Machine Uni", 0}; |
| static const UChar* sinhalaFonts[] = {L"Iskoola Pota", L"AksharUnicode", 0}; |
| static const UChar* yiFonts[] = {L"Microsoft Yi Balti", L"Nuosu SIL", L"Code2000", 0}; |
| // http://www.bethmardutho.org/support/meltho/download/index.php |
| static const UChar* syriacFonts[] = {L"Estrangelo Edessa", L"Estrangelo Nisibin", L"Code2000", 0}; |
| // No Myanmar/Burmese font is shipped with Windows, yet. Try a few |
| // widely available/used ones that supports Unicode 5.1 or later. |
| static const UChar* myanmarFonts[] = {L"Padauk", L"Parabaik", L"Myanmar3", L"Code2000", 0}; |
| |
| static const ScriptToFontFamilies scriptToFontFamilies[] = { |
| {USCRIPT_MALAYALAM, malayalamFonts}, |
| {USCRIPT_KHMER, khmerFonts}, |
| {USCRIPT_ETHIOPIC, ethiopicFonts}, |
| {USCRIPT_ORIYA, oriyaFonts}, |
| {USCRIPT_LAO, laoFonts}, |
| {USCRIPT_TIBETAN, tibetanFonts}, |
| {USCRIPT_SINHALA, sinhalaFonts}, |
| {USCRIPT_YI, yiFonts}, |
| {USCRIPT_SYRIAC, syriacFonts}, |
| {USCRIPT_MYANMAR, myanmarFonts}, |
| }; |
| |
| for (size_t i = 0; i < WTF_ARRAY_LENGTH(fontMap); ++i) |
| scriptFontMap[fontMap[i].script] = fontMap[i].family; |
| |
| // FIXME: Instead of scanning the hard-coded list, we have to |
| // use EnumFont* to 'inspect' fonts to pick up fonts covering scripts |
| // when it's possible (e.g. using OS/2 table). If we do that, this |
| // had better be pulled out of here. |
| for (size_t i = 0; i < WTF_ARRAY_LENGTH(scriptToFontFamilies); ++i) { |
| UScriptCode script = scriptToFontFamilies[i].script; |
| scriptFontMap[script] = 0; |
| const UChar** familyPtr = scriptToFontFamilies[i].families; |
| while (*familyPtr) { |
| if (isFontPresent(*familyPtr, fontManager)) { |
| scriptFontMap[script] = *familyPtr; |
| break; |
| } |
| ++familyPtr; |
| } |
| } |
| |
| // Initialize the locale-dependent mapping. |
| // Since Chrome synchronizes the ICU default locale with its UI locale, |
| // this ICU locale tells the current UI locale of Chrome. |
| icu::Locale locale = icu::Locale::getDefault(); |
| const UChar* localeFamily = 0; |
| if (locale == icu::Locale::getJapanese()) { |
| localeFamily = scriptFontMap[USCRIPT_HIRAGANA]; |
| } else if (locale == icu::Locale::getKorean()) { |
| localeFamily = scriptFontMap[USCRIPT_HANGUL]; |
| } else if (locale == icu::Locale::getTraditionalChinese()) { |
| localeFamily = scriptFontMap[USCRIPT_TRADITIONAL_HAN]; |
| } else { |
| // For other locales, use the simplified Chinese font for Han. |
| localeFamily = scriptFontMap[USCRIPT_SIMPLIFIED_HAN]; |
| } |
| if (localeFamily) |
| scriptFontMap[USCRIPT_HAN] = localeFamily; |
| } |
| |
| // There are a lot of characters in USCRIPT_COMMON that can be covered |
| // by fonts for scripts closely related to them. See |
| // http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[:Script=Common:] |
| // FIXME: make this more efficient with a wider coverage |
| UScriptCode getScriptBasedOnUnicodeBlock(int ucs4) |
| { |
| UBlockCode block = ublock_getCode(ucs4); |
| switch (block) { |
| case UBLOCK_CJK_SYMBOLS_AND_PUNCTUATION: |
| return USCRIPT_HAN; |
| case UBLOCK_HIRAGANA: |
| case UBLOCK_KATAKANA: |
| return USCRIPT_HIRAGANA; |
| case UBLOCK_ARABIC: |
| return USCRIPT_ARABIC; |
| case UBLOCK_THAI: |
| return USCRIPT_THAI; |
| case UBLOCK_GREEK: |
| return USCRIPT_GREEK; |
| case UBLOCK_DEVANAGARI: |
| // For Danda and Double Danda (U+0964, U+0965), use a Devanagari |
| // font for now although they're used by other scripts as well. |
| // Without a context, we can't do any better. |
| return USCRIPT_DEVANAGARI; |
| case UBLOCK_ARMENIAN: |
| return USCRIPT_ARMENIAN; |
| case UBLOCK_GEORGIAN: |
| return USCRIPT_GEORGIAN; |
| case UBLOCK_KANNADA: |
| return USCRIPT_KANNADA; |
| default: |
| return USCRIPT_COMMON; |
| } |
| } |
| |
| UScriptCode getScript(int ucs4) |
| { |
| UErrorCode err = U_ZERO_ERROR; |
| UScriptCode script = uscript_getScript(ucs4, &err); |
| // If script is invalid, common or inherited or there's an error, |
| // infer a script based on the unicode block of a character. |
| if (script <= USCRIPT_INHERITED || U_FAILURE(err)) |
| script = getScriptBasedOnUnicodeBlock(ucs4); |
| return script; |
| } |
| |
| } // namespace |
| |
| // FIXME: this is font fallback code version 0.1 |
| // - Cover all the scripts |
| // - Get the default font for each script/generic family from the |
| // preference instead of hardcoding in the source. |
| // (at least, read values from the registry for IE font settings). |
| // - Support generic families (from FontDescription) |
| // - If the default font for a script is not available, |
| // try some more fonts known to support it. Finally, we can |
| // use EnumFontFamilies or similar APIs to come up with a list of |
| // fonts supporting the script and cache the result. |
| // - Consider using UnicodeSet (or UnicodeMap) converted from |
| // GLYPHSET (BMP) or directly read from truetype cmap tables to |
| // keep track of which character is supported by which font |
| // - Update script_font_cache in response to WM_FONTCHANGE |
| |
| const UChar* getFontFamilyForScript(UScriptCode script, |
| FontDescription::GenericFamilyType generic, |
| SkFontMgr* fontManager) |
| { |
| static ScriptToFontMap scriptFontMap; |
| static ScriptToFontMap scriptMonospaceFontMap; |
| static bool initialized = false; |
| if (!initialized) { |
| initializeScriptFontMap(scriptFontMap, fontManager); |
| initializeScriptMonospaceFontMap(scriptMonospaceFontMap, fontManager); |
| initialized = true; |
| } |
| if (script == USCRIPT_INVALID_CODE) |
| return 0; |
| ASSERT(script < USCRIPT_CODE_LIMIT); |
| if (generic == FontDescription::MonospaceFamily && scriptMonospaceFontMap[script]) |
| return scriptMonospaceFontMap[script]; |
| return scriptFontMap[script]; |
| } |
| |
| // FIXME: |
| // - Handle 'Inherited', 'Common' and 'Unknown' |
| // (see http://www.unicode.org/reports/tr24/#Usage_Model ) |
| // For 'Inherited' and 'Common', perhaps we need to |
| // accept another parameter indicating the previous family |
| // and just return it. |
| // - All the characters (or characters up to the point a single |
| // font can cover) need to be taken into account |
| const UChar* getFallbackFamily(UChar32 character, |
| FontDescription::GenericFamilyType generic, |
| UScriptCode* scriptChecked, |
| SkFontMgr* fontManager) |
| { |
| ASSERT(character); |
| UScriptCode script = getScript(character); |
| |
| // For the full-width ASCII characters (U+FF00 - U+FF5E), use the font for |
| // Han (determined in a locale-dependent way above). Full-width ASCII |
| // characters are rather widely used in Japanese and Chinese documents and |
| // they're fully covered by Chinese, Japanese and Korean fonts. |
| if (0xFF00 < character && character < 0xFF5F) |
| script = USCRIPT_HAN; |
| |
| if (script == USCRIPT_COMMON) |
| script = getScriptBasedOnUnicodeBlock(character); |
| |
| const UChar* family = getFontFamilyForScript(script, generic, fontManager); |
| // Another lame work-around to cover non-BMP characters. |
| // If the font family for script is not found or the character is |
| // not in BMP (> U+FFFF), we resort to the hard-coded list of |
| // fallback fonts for now. |
| if (!family || character > 0xFFFF) { |
| int plane = character >> 16; |
| switch (plane) { |
| case 1: |
| family = L"code2001"; |
| break; |
| case 2: |
| // Use a Traditional Chinese ExtB font if in Traditional Chinese locale. |
| // Otherwise, use a Simplified Chinese ExtB font. Windows Japanese |
| // fonts do support a small subset of ExtB (that are included in JIS X 0213), |
| // but its coverage is rather sparse. |
| // Eventually, this should be controlled by lang/xml:lang. |
| if (icu::Locale::getDefault() == icu::Locale::getTraditionalChinese()) |
| family = L"pmingliu-extb"; |
| else |
| family = L"simsun-extb"; |
| break; |
| default: |
| family = L"lucida sans unicode"; |
| } |
| } |
| |
| if (scriptChecked) |
| *scriptChecked = script; |
| return family; |
| } |
| |
| } // namespace WebCore |
