Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/FontDataCache.cpp

-/*
- * 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 "core/platform/graphics/FontDataCache.h"
-
-#include "core/platform/graphics/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;
-}
-
-}