| Adam Barth | 06caa3d | 2014-10-23 11:15:41 -0700 | [diff] [blame] | 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 | #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 | |
| 43 | static AtomicString getFamilyNameForCharacter(UChar32 c, UScriptCode script) |
| 44 | { |
| 45 | // This is a hack to use the preferred font for CJK scripts. |
| 46 | // FIXME: Use new Skia API once Android system supports per-family and per-script fallback fonts. |
| 47 | const char* locale; |
| 48 | switch (script) { |
| 49 | case USCRIPT_SIMPLIFIED_HAN: |
| 50 | locale = "zh-CN"; |
| 51 | break; |
| 52 | case USCRIPT_TRADITIONAL_HAN: |
| 53 | locale = "zh-TW"; |
| 54 | break; |
| 55 | case USCRIPT_KATAKANA_OR_HIRAGANA: |
| 56 | locale = "ja"; |
| 57 | break; |
| 58 | case USCRIPT_HANGUL: |
| 59 | locale = "ko"; |
| 60 | break; |
| 61 | default: |
| 62 | locale = 0; |
| 63 | break; |
| 64 | } |
| 65 | |
| 66 | RefPtr<SkFontMgr> fm = adoptRef(SkFontMgr::RefDefault()); |
| 67 | RefPtr<SkTypeface> typeface = adoptRef(fm->matchFamilyStyleCharacter(0, SkFontStyle(), locale, c)); |
| 68 | if (!typeface) |
| 69 | return emptyAtom; |
| 70 | |
| 71 | SkString skiaFamilyName; |
| 72 | typeface->getFamilyName(&skiaFamilyName); |
| 73 | return skiaFamilyName.c_str(); |
| 74 | } |
| 75 | |
| 76 | PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*) |
| 77 | { |
| 78 | AtomicString familyName = getFamilyNameForCharacter(c, fontDescription.script()); |
| 79 | if (familyName.isEmpty()) |
| 80 | return getLastResortFallbackFont(fontDescription, DoNotRetain); |
| 81 | return fontDataFromFontPlatformData(getFontPlatformData(fontDescription, FontFaceCreationParams(familyName)), DoNotRetain); |
| 82 | } |
| 83 | |
| 84 | // static |
| 85 | AtomicString FontCache::getGenericFamilyNameForScript(const AtomicString& familyName, UScriptCode script) |
| 86 | { |
| 87 | // This is a hack to use the preferred font for CJK scripts. |
| 88 | // FIXME: Use new Skia API once Android system supports per-family and per-script fallback fonts. |
| 89 | UChar32 examplerChar; |
| 90 | switch (script) { |
| 91 | case USCRIPT_SIMPLIFIED_HAN: |
| 92 | case USCRIPT_TRADITIONAL_HAN: |
| 93 | case USCRIPT_KATAKANA_OR_HIRAGANA: |
| 94 | examplerChar = 0x4E00; // A common character in Japanese and Chinese. |
| 95 | break; |
| 96 | case USCRIPT_HANGUL: |
| 97 | examplerChar = 0xAC00; |
| 98 | break; |
| 99 | default: |
| 100 | // For other scripts, use the default generic family mapping logic. |
| 101 | return familyName; |
| 102 | } |
| 103 | |
| 104 | return getFamilyNameForCharacter(examplerChar, script); |
| 105 | } |
| 106 | |
| 107 | } // namespace blink |
