| /* |
| * Copyright (C) 2006, 2010 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef FontFallbackList_h |
| #define FontFallbackList_h |
| |
| #include "platform/fonts/FontSelector.h" |
| #include "platform/fonts/SimpleFontData.h" |
| #include "platform/fonts/WidthCache.h" |
| #include "wtf/Forward.h" |
| #include "wtf/MainThread.h" |
| |
| namespace blink { |
| |
| class GlyphPageTreeNode; |
| class FontDescription; |
| |
| const int cAllFamiliesScanned = -1; |
| |
| class PLATFORM_EXPORT FontFallbackList : public RefCounted<FontFallbackList> { |
| WTF_MAKE_NONCOPYABLE(FontFallbackList); |
| public: |
| typedef HashMap<int, GlyphPageTreeNode*, DefaultHash<int>::Hash> GlyphPages; |
| |
| class GlyphPagesStateSaver { |
| public: |
| GlyphPagesStateSaver(FontFallbackList& fallbackList) |
| : m_fallbackList(fallbackList) |
| , m_pages(fallbackList.m_pages) |
| , m_pageZero(fallbackList.m_pageZero) |
| { |
| } |
| |
| ~GlyphPagesStateSaver() |
| { |
| m_fallbackList.m_pages = m_pages; |
| m_fallbackList.m_pageZero = m_pageZero; |
| } |
| |
| private: |
| FontFallbackList& m_fallbackList; |
| GlyphPages& m_pages; |
| GlyphPageTreeNode* m_pageZero; |
| }; |
| |
| static PassRefPtr<FontFallbackList> create() { return adoptRef(new FontFallbackList()); } |
| |
| ~FontFallbackList() { releaseFontData(); } |
| void invalidate(PassRefPtrWillBeRawPtr<FontSelector>); |
| |
| bool isFixedPitch(const FontDescription& fontDescription) const |
| { |
| if (m_pitch == UnknownPitch) |
| determinePitch(fontDescription); |
| return m_pitch == FixedPitch; |
| } |
| void determinePitch(const FontDescription&) const; |
| |
| bool loadingCustomFonts() const; |
| bool shouldSkipDrawing() const; |
| |
| FontSelector* fontSelector() const { return m_fontSelector.get(); } |
| // FIXME: It should be possible to combine fontSelectorVersion and generation. |
| unsigned fontSelectorVersion() const { return m_fontSelectorVersion; } |
| unsigned generation() const { return m_generation; } |
| |
| WidthCache& widthCache() const { return m_widthCache; } |
| |
| const SimpleFontData* primarySimpleFontData(const FontDescription& fontDescription) |
| { |
| ASSERT(isMainThread()); |
| if (!m_cachedPrimarySimpleFontData) |
| m_cachedPrimarySimpleFontData = determinePrimarySimpleFontData(fontDescription); |
| return m_cachedPrimarySimpleFontData; |
| } |
| const FontData* fontDataAt(const FontDescription&, unsigned index) const; |
| |
| GlyphPageTreeNode* getPageNode(unsigned pageNumber) const |
| { |
| return pageNumber ? m_pages.get(pageNumber) : m_pageZero; |
| } |
| |
| void setPageNode(unsigned pageNumber, GlyphPageTreeNode* node) |
| { |
| if (pageNumber) |
| m_pages.set(pageNumber, node); |
| else |
| m_pageZero = node; |
| } |
| |
| private: |
| FontFallbackList(); |
| |
| PassRefPtr<FontData> getFontData(const FontDescription&, int& familyIndex) const; |
| |
| const SimpleFontData* determinePrimarySimpleFontData(const FontDescription&) const; |
| |
| void releaseFontData(); |
| |
| mutable Vector<RefPtr<FontData>, 1> m_fontList; |
| GlyphPages m_pages; |
| GlyphPageTreeNode* m_pageZero; |
| mutable const SimpleFontData* m_cachedPrimarySimpleFontData; |
| RefPtrWillBePersistent<FontSelector> m_fontSelector; |
| mutable WidthCache m_widthCache; |
| unsigned m_fontSelectorVersion; |
| mutable int m_familyIndex; |
| unsigned short m_generation; |
| mutable unsigned m_pitch : 3; // Pitch |
| mutable bool m_hasLoadingFallback : 1; |
| }; |
| |
| } // namespace blink |
| |
| #endif |