| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * 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. |
| * 3. Neither the name of Google Inc. nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 THE COPYRIGHT |
| * OWNER 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. |
| */ |
| |
| #ifndef FontCacheKey_h |
| #define FontCacheKey_h |
| |
| #include "wtf/HashMap.h" |
| #include "wtf/HashTableDeletedValueType.h" |
| #include "wtf/text/AtomicStringHash.h" |
| #include "wtf/text/StringHash.h" |
| |
| namespace WebCore { |
| |
| // Multiplying the floating point size by 100 gives two decimal point |
| // precision which should be sufficient. |
| static const unsigned s_fontSizePrecisionMultiplier = 100; |
| |
| struct FontCacheKey { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| FontCacheKey() |
| : m_familyName() |
| , m_fontSize(0) |
| , m_options(0) { } |
| FontCacheKey(AtomicString familyName, float fontSize, unsigned options) |
| : m_familyName(familyName) |
| , m_fontSize(fontSize * s_fontSizePrecisionMultiplier) |
| , m_options(options) { } |
| FontCacheKey(WTF::HashTableDeletedValueType) |
| : m_fontSize(hashTableDeletedSize()) { } |
| |
| unsigned hash() const |
| { |
| unsigned hashCodes[3] = { |
| CaseFoldingHash::hash(m_familyName), |
| m_fontSize, |
| m_options |
| }; |
| return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes); |
| } |
| |
| bool operator==(const FontCacheKey& other) const |
| { |
| return equalIgnoringCase(m_familyName, other.m_familyName) |
| && m_fontSize == other.m_fontSize |
| && m_options == other.m_options; |
| } |
| |
| bool isHashTableDeletedValue() const |
| { |
| return m_fontSize == hashTableDeletedSize(); |
| } |
| |
| static unsigned precisionMultiplier() |
| { |
| return s_fontSizePrecisionMultiplier; |
| } |
| |
| private: |
| static unsigned hashTableDeletedSize() |
| { |
| return 0xFFFFFFFFU; |
| } |
| |
| AtomicString m_familyName; |
| unsigned m_fontSize; |
| unsigned m_options; |
| }; |
| |
| struct FontCacheKeyHash { |
| static unsigned hash(const FontCacheKey& key) |
| { |
| return key.hash(); |
| } |
| |
| static bool equal(const FontCacheKey& a, const FontCacheKey& b) |
| { |
| return a == b; |
| } |
| |
| static const bool safeToCompareToEmptyOrDeleted = true; |
| }; |
| |
| struct FontCacheKeyTraits : WTF::SimpleClassHashTraits<FontCacheKey> { }; |
| |
| } |
| |
| #endif // FontCacheKey_h |