author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 24 Sep 2009 12:53:48 +0300 | |
changeset 11 | c8a366e56285 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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* its contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef GlyphPageTreeNode_h |
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#define GlyphPageTreeNode_h |
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#include <wtf/unicode/Unicode.h> |
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#include <wtf/Noncopyable.h> |
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#include <wtf/HashMap.h> |
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namespace WebCore { |
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class FontData; |
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class GlyphPageTreeNode; |
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typedef unsigned short Glyph; |
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|
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// Holds the glyph index and the corresponding FontData information for a given |
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// character. |
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struct GlyphData { |
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Glyph glyph; |
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const FontData* fontData; |
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}; |
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// A GlyphPage contains a fixed-size set of GlyphData mappings for a contiguous |
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// range of characters in the Unicode code space. GlyphPages are indexed |
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// starting from 0 and incrementing for each 256 glyphs. |
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// |
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// One page may actually include glyphs from other fonts if the characters are |
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// missing in the parimary font. It is owned by exactly one GlyphPageTreeNode, |
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// although multiple nodes may reference it as their "page" if they are supposed |
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// to be overriding the parent's node, but provide no additional information. |
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struct GlyphPage { |
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GlyphPage() |
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: m_owner(0) |
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{ |
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} |
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GlyphPage(GlyphPageTreeNode* owner) |
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: m_owner(owner) |
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{ |
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} |
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static const size_t size = 256; // Covers Latin-1 in a single page. |
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GlyphData m_glyphs[size]; |
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GlyphPageTreeNode* m_owner; |
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const GlyphData& glyphDataForCharacter(UChar32 c) const { return m_glyphs[c % size]; } |
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void setGlyphDataForCharacter(UChar32 c, Glyph g, const FontData* f) |
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{ |
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setGlyphDataForIndex(c % size, g, f); |
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} |
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void setGlyphDataForIndex(unsigned index, Glyph g, const FontData* f) |
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{ |
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m_glyphs[index].glyph = g; |
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m_glyphs[index].fontData = f; |
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} |
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GlyphPageTreeNode* owner() const { return m_owner; } |
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// Implemented by the platform. |
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bool fill(UChar* characterBuffer, unsigned bufferLength, const FontData* fontData); |
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}; |
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|
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// The glyph page tree is a data structure that maps (FontData, glyph page number) |
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// to a GlyphPage. Level 0 (the "root") is special. There is one root |
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// GlyphPageTreeNode for each glyph page number. The roots do not have a |
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// GlyphPage associated with them, and their initializePage() function is never |
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// called to fill the glyphs. |
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// |
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// Each root node maps a FontData pointer to another GlyphPageTreeNode at |
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// level 1 (the "root child") that stores the actual glyphs for a specific font data. |
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// These nodes will only have a GlyphPage if they have glyphs for that range. |
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// |
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// Levels greater than one correspond to subsequent levels of the fallback list |
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// for that font. These levels override their parent's page of glyphs by |
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// filling in holes with the new font (thus making a more complete page). |
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// |
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// A NULL FontData pointer corresponds to the system fallback |
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// font. It is tracked separately from the regular pages and overrides so that |
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// the glyph pages do not get polluted with these last-resort glyphs. The |
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// system fallback page is not populated at construction like the other pages, |
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// but on demand for each glyph, because the system may need to use different |
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// fallback fonts for each. This lazy population is done by the Font. |
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class GlyphPageTreeNode { |
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public: |
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GlyphPageTreeNode() |
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: m_parent(0) |
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, m_page(0) |
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, m_level(0) |
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, m_isSystemFallback(false) |
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, m_systemFallbackChild(0) |
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#ifndef NDEBUG |
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, m_pageNumber(0) |
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#endif |
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{ |
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} |
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|
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static GlyphPageTreeNode* getRootChild(const FontData* fontData, unsigned pageNumber) |
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{ |
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return getRoot(pageNumber)->getChild(fontData, pageNumber); |
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} |
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|
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GlyphPageTreeNode* parent() const { return m_parent; } |
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GlyphPageTreeNode* getChild(const FontData*, unsigned pageNumber); |
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|
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// Returns a page of glyphs (or NULL if there are no glyphs in this page's character range). |
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GlyphPage* page() const { return m_page; } |
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|
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// Returns the level of this node. See class-level comment. |
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unsigned level() const { return m_level; } |
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|
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// The system fallback font has special rules (see above). |
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bool isSystemFallback() const { return m_isSystemFallback; } |
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|
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private: |
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static GlyphPageTreeNode* getRoot(unsigned pageNumber); |
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void initializePage(const FontData*, unsigned pageNumber); |
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|
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GlyphPageTreeNode* m_parent; |
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GlyphPage* m_page; |
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unsigned m_level; |
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bool m_isSystemFallback; |
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HashMap<const FontData*, GlyphPageTreeNode*> m_children; |
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GlyphPageTreeNode* m_systemFallbackChild; |
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#ifndef NDEBUG |
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unsigned m_pageNumber; |
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#endif |
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}; |
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} // namespace WebCore |
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#endif // GlyphPageTreeNode_h |