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94 lines
3.7 KiB
C++
94 lines
3.7 KiB
C++
/*
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* Copyright (c) 2017 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 "flutter/sky/engine/platform/text/LocaleToScriptMapping.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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// SkFontMgr requires script-based locale names, like "zh-Hant" and "zh-Hans",
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// instead of "zh-CN" and "zh-TW".
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static CString toSkFontMgrLocale(const String& locale) {
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if (!locale.startsWith("zh", TextCaseInsensitive))
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return locale.ascii();
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switch (localeToScriptCodeForFontSelection(locale)) {
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case USCRIPT_SIMPLIFIED_HAN:
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return "zh-Hans";
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case USCRIPT_TRADITIONAL_HAN:
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return "zh-Hant";
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default:
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return locale.ascii();
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}
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}
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static AtomicString getFamilyNameForCharacter(
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UChar32 c,
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const FontDescription& fontDescription) {
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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 = toSkFontMgrLocale(defaultLanguage());
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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 = toSkFontMgrLocale(fontDescription.locale());
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bcp47Locales[localeCount++] = fontLocale.data();
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}
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sk_sp<SkTypeface> typeface(fm->matchFamilyStyleCharacter(
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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(
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const FontDescription& fontDescription,
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UChar32 c,
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const SimpleFontData*) {
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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(
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getFontPlatformData(fontDescription, FontFaceCreationParams(familyName)),
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DoNotRetain);
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}
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} // namespace blink
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