| /* |
| * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. |
| * Copyright (C) 2012 Intel Corporation |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "FontCascade.h" |
| |
| #if USE(CAIRO) |
| |
| #include "FontCache.h" |
| #include "SurrogatePairAwareTextIterator.h" |
| #include <unicode/normlzr.h> |
| |
| namespace WebCore { |
| |
| bool FontCascade::canReturnFallbackFontsForComplexText() |
| { |
| return false; |
| } |
| |
| bool FontCascade::canExpandAroundIdeographsInComplexText() |
| { |
| return false; |
| } |
| |
| const Font* FontCascade::fontForCombiningCharacterSequence(const UChar* characters, size_t length) const |
| { |
| UErrorCode error = U_ZERO_ERROR; |
| Vector<UChar, 4> normalizedCharacters(length); |
| int32_t normalizedLength = unorm_normalize(characters, length, UNORM_NFC, UNORM_UNICODE_3_2, normalizedCharacters.data(), length, &error); |
| if (U_FAILURE(error)) |
| return nullptr; |
| |
| UChar32 character; |
| unsigned clusterLength = 0; |
| SurrogatePairAwareTextIterator iterator(normalizedCharacters.data(), 0, normalizedLength, normalizedLength); |
| if (!iterator.consume(character, clusterLength)) |
| return nullptr; |
| |
| const Font* baseFont = glyphDataForCharacter(character, false, NormalVariant).font; |
| if (baseFont && (static_cast<int32_t>(clusterLength) == normalizedLength || baseFont->canRenderCombiningCharacterSequence(characters, length))) |
| return baseFont; |
| |
| for (unsigned i = 0; !fallbackRangesAt(i).isNull(); ++i) { |
| const Font* fallbackFont = fallbackRangesAt(i).fontForCharacter(character); |
| if (!fallbackFont || fallbackFont == baseFont) |
| continue; |
| |
| if (fallbackFont->canRenderCombiningCharacterSequence(characters, length)) |
| return fallbackFont; |
| } |
| |
| if (auto systemFallback = FontCache::singleton().systemFallbackForCharacters(m_fontDescription, baseFont, false, characters, length)) { |
| if (systemFallback->canRenderCombiningCharacterSequence(characters, length)) |
| return systemFallback.get(); |
| } |
| |
| return baseFont; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // USE(CAIRO) |