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