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101 lines
3.7 KiB
C++
101 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013 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
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* are met:
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*
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* 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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* 3. Neither the name of Google Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* 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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#ifndef SKY_ENGINE_PLATFORM_FONTS_FONTCACHEKEY_H_
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#define SKY_ENGINE_PLATFORM_FONTS_FONTCACHEKEY_H_
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#include "flutter/sky/engine/platform/fonts/FontFaceCreationParams.h"
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#include "flutter/sky/engine/wtf/HashMap.h"
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#include "flutter/sky/engine/wtf/HashTableDeletedValueType.h"
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#include "flutter/sky/engine/wtf/text/AtomicStringHash.h"
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#include "flutter/sky/engine/wtf/text/StringHash.h"
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namespace blink {
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// Multiplying the floating point size by 100 gives two decimal point
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// precision which should be sufficient.
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static const unsigned s_fontSizePrecisionMultiplier = 100;
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struct FontCacheKey {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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FontCacheKey() : m_creationParams(), m_fontSize(0), m_options(0) {}
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FontCacheKey(FontFaceCreationParams creationParams,
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float fontSize,
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unsigned options)
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: m_creationParams(creationParams),
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m_fontSize(fontSize * s_fontSizePrecisionMultiplier),
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m_options(options) {}
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FontCacheKey(WTF::HashTableDeletedValueType)
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: m_fontSize(hashTableDeletedSize()) {}
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unsigned hash() const {
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unsigned hashCodes[3] = {m_creationParams.hash(), m_fontSize, m_options};
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return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
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}
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bool operator==(const FontCacheKey& other) const {
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return m_creationParams == other.m_creationParams &&
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m_fontSize == other.m_fontSize && m_options == other.m_options;
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}
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bool isHashTableDeletedValue() const {
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return m_fontSize == hashTableDeletedSize();
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}
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static unsigned precisionMultiplier() {
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return s_fontSizePrecisionMultiplier;
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}
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private:
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static unsigned hashTableDeletedSize() { return 0xFFFFFFFFU; }
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FontFaceCreationParams m_creationParams;
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unsigned m_fontSize;
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unsigned m_options;
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};
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struct FontCacheKeyHash {
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static unsigned hash(const FontCacheKey& key) { return key.hash(); }
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static bool equal(const FontCacheKey& a, const FontCacheKey& b) {
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return a == b;
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}
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static const bool safeToCompareToEmptyOrDeleted = true;
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};
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struct FontCacheKeyTraits : WTF::SimpleClassHashTraits<FontCacheKey> {};
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_FONTS_FONTCACHEKEY_H_
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