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95 lines
4.0 KiB
C++
95 lines
4.0 KiB
C++
/*
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* Copyright (c) 2011 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "flutter/sky/engine/platform/fonts/FontCache.h"
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#include "flutter/sky/engine/platform/Language.h"
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#include "flutter/sky/engine/platform/fonts/FontDescription.h"
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#include "flutter/sky/engine/platform/fonts/FontFaceCreationParams.h"
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#include "flutter/sky/engine/platform/fonts/SimpleFontData.h"
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#include "third_party/skia/include/core/SkTypeface.h"
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#include "third_party/skia/include/ports/SkFontMgr.h"
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namespace blink {
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static AtomicString getFamilyNameForCharacter(UChar32 c, const FontDescription& fontDescription)
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{
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sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
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const char* bcp47Locales[2];
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int localeCount = 0;
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CString defaultLocale = defaultLanguage().ascii();
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bcp47Locales[localeCount++] = defaultLocale.data();
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CString fontLocale;
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if (!fontDescription.locale().isEmpty()) {
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fontLocale = fontDescription.locale().ascii();
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bcp47Locales[localeCount++] = fontLocale.data();
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}
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sk_sp<SkTypeface> typeface(fm->matchFamilyStyleCharacter(0, SkFontStyle(), bcp47Locales, localeCount, c));
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if (!typeface)
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return emptyAtom;
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SkString skiaFamilyName;
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typeface->getFamilyName(&skiaFamilyName);
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return skiaFamilyName.c_str();
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}
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PassRefPtr<SimpleFontData> FontCache::fallbackFontForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*)
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{
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AtomicString familyName = getFamilyNameForCharacter(c, fontDescription);
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if (familyName.isEmpty())
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return getLastResortFallbackFont(fontDescription, DoNotRetain);
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return fontDataFromFontPlatformData(getFontPlatformData(fontDescription, FontFaceCreationParams(familyName)), DoNotRetain);
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}
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// static
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AtomicString FontCache::getGenericFamilyNameForScript(const AtomicString& familyName, const FontDescription& fontDescription)
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{
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// This is a hack to use the preferred font for CJK scripts.
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// FIXME: Use new Skia API once Android system supports per-family and per-script fallback fonts.
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UChar32 examplerChar;
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switch (fontDescription.script()) {
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case USCRIPT_SIMPLIFIED_HAN:
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case USCRIPT_TRADITIONAL_HAN:
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case USCRIPT_KATAKANA_OR_HIRAGANA:
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examplerChar = 0x4E00; // A common character in Japanese and Chinese.
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break;
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case USCRIPT_HANGUL:
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examplerChar = 0xAC00;
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break;
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default:
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// For other scripts, use the default generic family mapping logic.
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return familyName;
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}
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return getFamilyNameForCharacter(examplerChar, fontDescription);
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}
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} // namespace blink
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