| /* |
| * 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. |
| */ |
| |
| #include "config.h" |
| #include "platform/fonts/FontDataCache.h" |
| |
| #include "platform/fonts/SimpleFontData.h" |
| |
| using namespace WTF; |
| |
| namespace WebCore { |
| |
| #if !OS(ANDROID) |
| const unsigned cMaxInactiveFontData = 250; |
| const unsigned cTargetInactiveFontData = 200; |
| #else |
| const unsigned cMaxInactiveFontData = 225; |
| const unsigned cTargetInactiveFontData = 200; |
| #endif |
| |
| PassRefPtr<SimpleFontData> FontDataCache::get(const FontPlatformData* platformData, ShouldRetain shouldRetain) |
| { |
| if (!platformData) |
| return 0; |
| |
| Cache::iterator result = m_cache.find(*platformData); |
| if (result == m_cache.end()) { |
| pair<RefPtr<SimpleFontData>, unsigned> newValue(SimpleFontData::create(*platformData), shouldRetain == Retain ? 1 : 0); |
| m_cache.set(*platformData, newValue); |
| if (shouldRetain == DoNotRetain) |
| m_inactiveFontData.add(newValue.first); |
| return newValue.first.release(); |
| } |
| |
| if (!result.get()->value.second) { |
| ASSERT(m_inactiveFontData.contains(result.get()->value.first)); |
| m_inactiveFontData.remove(result.get()->value.first); |
| } |
| |
| if (shouldRetain == Retain) { |
| result.get()->value.second++; |
| } else if (!result.get()->value.second) { |
| // If shouldRetain is DoNotRetain and count is 0, we want to remove the fontData from |
| // m_inactiveFontData (above) and re-add here to update LRU position. |
| m_inactiveFontData.add(result.get()->value.first); |
| } |
| |
| return result.get()->value.first; |
| } |
| |
| bool FontDataCache::contains(const FontPlatformData* fontPlatformData) const |
| { |
| return m_cache.contains(*fontPlatformData); |
| } |
| |
| void FontDataCache::release(const SimpleFontData* fontData) |
| { |
| ASSERT(!fontData->isCustomFont()); |
| |
| Cache::iterator it = m_cache.find(fontData->platformData()); |
| ASSERT(it != m_cache.end()); |
| if (it == m_cache.end()) |
| return; |
| |
| ASSERT(it->value.second); |
| if (!--it->value.second) |
| m_inactiveFontData.add(it->value.first); |
| } |
| |
| void FontDataCache::markAllVerticalData() |
| { |
| #if ENABLE(OPENTYPE_VERTICAL) |
| Cache::iterator end = m_cache.end(); |
| for (Cache::iterator fontData = m_cache.begin(); fontData != end; ++fontData) { |
| OpenTypeVerticalData* verticalData = const_cast<OpenTypeVerticalData*>(fontData->value.first->verticalData()); |
| if (verticalData) |
| verticalData->setInFontCache(true); |
| } |
| #endif |
| } |
| |
| bool FontDataCache::purge(PurgeSeverity PurgeSeverity) |
| { |
| if (PurgeSeverity == ForcePurge) |
| return purgeLeastRecentlyUsed(INT_MAX); |
| |
| if (m_inactiveFontData.size() > cMaxInactiveFontData) |
| return purgeLeastRecentlyUsed(m_inactiveFontData.size() - cTargetInactiveFontData); |
| |
| return false; |
| } |
| |
| bool FontDataCache::purgeLeastRecentlyUsed(int count) |
| { |
| static bool isPurging; // Guard against reentry when e.g. a deleted FontData releases its small caps FontData. |
| if (isPurging) |
| return false; |
| |
| isPurging = true; |
| |
| Vector<RefPtr<SimpleFontData>, 20> fontDataToDelete; |
| ListHashSet<RefPtr<SimpleFontData> >::iterator end = m_inactiveFontData.end(); |
| ListHashSet<RefPtr<SimpleFontData> >::iterator it = m_inactiveFontData.begin(); |
| for (int i = 0; i < count && it != end; ++it, ++i) { |
| RefPtr<SimpleFontData>& fontData = *it.get(); |
| m_cache.remove(fontData->platformData()); |
| // We should not delete SimpleFontData here because deletion can modify m_inactiveFontData. See http://trac.webkit.org/changeset/44011 |
| fontDataToDelete.append(fontData); |
| } |
| |
| if (it == end) { |
| // Removed everything |
| m_inactiveFontData.clear(); |
| } else { |
| for (int i = 0; i < count; ++i) |
| m_inactiveFontData.remove(m_inactiveFontData.begin()); |
| } |
| |
| bool didWork = fontDataToDelete.size(); |
| |
| fontDataToDelete.clear(); |
| |
| isPurging = false; |
| |
| return didWork; |
| } |
| |
| } |