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 #include "platform/Language.h"
35 #include "platform/fonts/SimpleFontData.h"
36 #include "platform/fonts/FontDescription.h"
37 #include "platform/fonts/FontFaceCreationParams.h"
38 #include "third_party/skia/include/core/SkTypeface.h"
39 #include "third_party/skia/include/ports/SkFontMgr.h"
40
41 namespace blink {
42
getFamilyNameForCharacter(UChar32 c,const FontDescription & fontDescription)43 static AtomicString getFamilyNameForCharacter(UChar32 c, const FontDescription& fontDescription)
44 {
45 RefPtr<SkFontMgr> fm = adoptRef(SkFontMgr::RefDefault());
46 const char* bcp47Locales[2];
47 int localeCount = 0;
48 CString defaultLocale = defaultLanguage().ascii();
49 bcp47Locales[localeCount++] = defaultLocale.data();
50 CString fontLocale;
51 if (!fontDescription.locale().isEmpty()) {
52 fontLocale = fontDescription.locale().ascii();
53 bcp47Locales[localeCount++] = fontLocale.data();
54 }
55 RefPtr<SkTypeface> typeface = adoptRef(fm->matchFamilyStyleCharacter(0, SkFontStyle(), bcp47Locales, localeCount, c));
56 if (!typeface)
57 return emptyAtom;
58
59 SkString skiaFamilyName;
60 typeface->getFamilyName(&skiaFamilyName);
61 return skiaFamilyName.c_str();
62 }
63
fallbackFontForCharacter(const FontDescription & fontDescription,UChar32 c,const SimpleFontData *)64 PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*)
65 {
66 AtomicString familyName = getFamilyNameForCharacter(c, fontDescription);
67 if (familyName.isEmpty())
68 return getLastResortFallbackFont(fontDescription, DoNotRetain);
69 return fontDataFromFontPlatformData(getFontPlatformData(fontDescription, FontFaceCreationParams(familyName)), DoNotRetain);
70 }
71
72 // static
getGenericFamilyNameForScript(const AtomicString & familyName,const FontDescription & fontDescription)73 AtomicString FontCache::getGenericFamilyNameForScript(const AtomicString& familyName, const FontDescription& fontDescription)
74 {
75 // This is a hack to use the preferred font for CJK scripts.
76 // FIXME: Use new Skia API once Android system supports per-family and per-script fallback fonts.
77 UChar32 examplerChar;
78 switch (fontDescription.script()) {
79 case USCRIPT_SIMPLIFIED_HAN:
80 case USCRIPT_TRADITIONAL_HAN:
81 case USCRIPT_KATAKANA_OR_HIRAGANA:
82 examplerChar = 0x4E00; // A common character in Japanese and Chinese.
83 break;
84 case USCRIPT_HANGUL:
85 examplerChar = 0xAC00;
86 break;
87 default:
88 // For other scripts, use the default generic family mapping logic.
89 return familyName;
90 }
91
92 return getFamilyNameForCharacter(examplerChar, fontDescription);
93 }
94
95 } // namespace blink
96