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      1 /*
      2  * Copyright (c) 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "platform/fonts/FontCache.h"
     33 
     34 
     35 #include "platform/fonts/SimpleFontData.h"
     36 #include "platform/fonts/FontDescription.h"
     37 
     38 #include "SkTypeface_android.h"
     39 
     40 namespace WebCore {
     41 
     42 static AtomicString getFamilyNameForCharacter(UChar32 c, UScriptCode script)
     43 {
     44     // This is a hack to use the preferred font for CJK scripts.
     45     // FIXME: Use new Skia API once Android system supports per-family and per-script fallback fonts.
     46     const char* locale;
     47     switch (script) {
     48     case USCRIPT_SIMPLIFIED_HAN:
     49         locale = "zh-CN";
     50         break;
     51     case USCRIPT_TRADITIONAL_HAN:
     52         locale = "zh-TW";
     53         break;
     54     case USCRIPT_KATAKANA_OR_HIRAGANA:
     55         locale = "ja";
     56         break;
     57     case USCRIPT_HANGUL:
     58         locale = "ko";
     59         break;
     60     default:
     61         locale = 0;
     62         break;
     63     }
     64 
     65     SkString skiaFamilyName;
     66     if (!SkGetFallbackFamilyNameForChar(c, locale, &skiaFamilyName) || skiaFamilyName.isEmpty())
     67         return emptyAtom;
     68 
     69     return skiaFamilyName.c_str();
     70 }
     71 
     72 PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*)
     73 {
     74     AtomicString familyName = getFamilyNameForCharacter(c, fontDescription.script());
     75     if (familyName.isEmpty())
     76         return getLastResortFallbackFont(fontDescription, DoNotRetain);
     77     return fontDataFromFontPlatformData(getFontPlatformData(fontDescription, familyName), DoNotRetain);
     78 }
     79 
     80 // static
     81 AtomicString FontCache::getGenericFamilyNameForScript(const AtomicString& familyName, UScriptCode script)
     82 {
     83     // This is a hack to use the preferred font for CJK scripts.
     84     // FIXME: Use new Skia API once Android system supports per-family and per-script fallback fonts.
     85     UChar32 examplerChar;
     86     switch (script) {
     87     case USCRIPT_SIMPLIFIED_HAN:
     88     case USCRIPT_TRADITIONAL_HAN:
     89     case USCRIPT_KATAKANA_OR_HIRAGANA:
     90         examplerChar = 0x4E00; // A common character in Japanese and Chinese.
     91         break;
     92     case USCRIPT_HANGUL:
     93         examplerChar = 0xAC00;
     94         break;
     95     default:
     96         // For other scripts, use the default generic family mapping logic.
     97         return familyName;
     98     }
     99 
    100     return getFamilyNameForCharacter(examplerChar, script);
    101 }
    102 
    103 } // namespace WebCore
    104