| /* |
| * 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * 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 FontDataCache_h |
| #define FontDataCache_h |
| |
| #include "platform/fonts/FontCache.h" |
| #include "platform/fonts/FontPlatformData.h" |
| #include "wtf/HashMap.h" |
| #include "wtf/ListHashSet.h" |
| |
| namespace blink { |
| |
| class SimpleFontData; |
| |
| struct FontDataCacheKeyHash { |
| static unsigned hash(const FontPlatformData& platformData) |
| { |
| return platformData.hash(); |
| } |
| |
| static bool equal(const FontPlatformData& a, const FontPlatformData& b) |
| { |
| return a == b; |
| } |
| |
| static const bool safeToCompareToEmptyOrDeleted = true; |
| }; |
| |
| struct FontDataCacheKeyTraits : WTF::GenericHashTraits<FontPlatformData> { |
| static const bool emptyValueIsZero = true; |
| static const bool needsDestruction = true; |
| static const FontPlatformData& emptyValue() |
| { |
| DEFINE_STATIC_LOCAL(FontPlatformData, key, (0.f, false, false)); |
| return key; |
| } |
| static void constructDeletedValue(FontPlatformData& slot, bool) |
| { |
| new (NotNull, &slot) FontPlatformData(WTF::HashTableDeletedValue); |
| } |
| static bool isDeletedValue(const FontPlatformData& value) |
| { |
| return value.isHashTableDeletedValue(); |
| } |
| }; |
| |
| class FontDataCache { |
| public: |
| PassRefPtr<SimpleFontData> get(const FontPlatformData*, ShouldRetain = Retain); |
| bool contains(const FontPlatformData*) const; |
| void release(const SimpleFontData*); |
| |
| // This is used by FontVerticalDataCache to mark all items with vertical data |
| // that are currently in cache as "in cache", which is later used to sweep the FontVerticalDataCache. |
| void markAllVerticalData(); |
| |
| // Purges items in FontDataCache according to provided severity. |
| // Returns true if any removal of cache items actually occurred. |
| bool purge(PurgeSeverity); |
| |
| private: |
| bool purgeLeastRecentlyUsed(int count); |
| |
| typedef HashMap<FontPlatformData, pair<RefPtr<SimpleFontData>, unsigned>, FontDataCacheKeyHash, FontDataCacheKeyTraits> Cache; |
| Cache m_cache; |
| ListHashSet<RefPtr<SimpleFontData> > m_inactiveFontData; |
| }; |
| |
| } // namespace blink |
| |
| #endif |