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Side by Side Diff: Source/platform/fonts/GlyphPageTreeNode.h

Issue 99103006: Moving GraphicsContext and dependencies from core to platform. (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Final patch - fixes Android Created 7 years ago
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1 /* 1 /*
2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. 2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions 5 * modification, are permitted provided that the following conditions
6 * are met: 6 * are met:
7 * 7 *
8 * 1. Redistributions of source code must retain the above copyright 8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer. 9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright 10 * 2. Redistributions in binary form must reproduce the above copyright
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31 31
32 #include "platform/fonts/GlyphPage.h" 32 #include "platform/fonts/GlyphPage.h"
33 #include <string.h> 33 #include <string.h>
34 #include "wtf/HashMap.h" 34 #include "wtf/HashMap.h"
35 #include "wtf/OwnPtr.h" 35 #include "wtf/OwnPtr.h"
36 #include "wtf/PassRefPtr.h" 36 #include "wtf/PassRefPtr.h"
37 #include "wtf/RefCounted.h" 37 #include "wtf/RefCounted.h"
38 #include "wtf/unicode/Unicode.h" 38 #include "wtf/unicode/Unicode.h"
39 39
40 #ifndef NDEBUG 40 #ifndef NDEBUG
41 void showGlyphPageTrees(); 41 void PLATFORM_EXPORT showGlyphPageTrees();
42 void showGlyphPageTree(unsigned pageNumber); 42 void PLATFORM_EXPORT showGlyphPageTree(unsigned pageNumber);
43 #endif 43 #endif
44 44
45 namespace WebCore { 45 namespace WebCore {
46 46
47 class FontData; 47 class FontData;
48 class SimpleFontData; 48 class SimpleFontData;
49 49
50 // The glyph page tree is a data structure that maps (FontData, glyph page numbe r) 50 // The glyph page tree is a data structure that maps (FontData, glyph page numbe r)
51 // to a GlyphPage. Level 0 (the "root") is special. There is one root 51 // to a GlyphPage. Level 0 (the "root") is special. There is one root
52 // GlyphPageTreeNode for each glyph page number. The roots do not have a 52 // GlyphPageTreeNode for each glyph page number. The roots do not have a
53 // GlyphPage associated with them, and their initializePage() function is never 53 // GlyphPage associated with them, and their initializePage() function is never
54 // called to fill the glyphs. 54 // called to fill the glyphs.
55 // 55 //
56 // Each root node maps a FontData pointer to another GlyphPageTreeNode at 56 // Each root node maps a FontData pointer to another GlyphPageTreeNode at
57 // level 1 (the "root child") that stores the actual glyphs for a specific font data. 57 // level 1 (the "root child") that stores the actual glyphs for a specific font data.
58 // These nodes will only have a GlyphPage if they have glyphs for that range. 58 // These nodes will only have a GlyphPage if they have glyphs for that range.
59 // 59 //
60 // Levels greater than one correspond to subsequent levels of the fallback list 60 // Levels greater than one correspond to subsequent levels of the fallback list
61 // for that font. These levels override their parent's page of glyphs by 61 // for that font. These levels override their parent's page of glyphs by
62 // filling in holes with the new font (thus making a more complete page). 62 // filling in holes with the new font (thus making a more complete page).
63 // 63 //
64 // A NULL FontData pointer corresponds to the system fallback 64 // A NULL FontData pointer corresponds to the system fallback
65 // font. It is tracked separately from the regular pages and overrides so that 65 // font. It is tracked separately from the regular pages and overrides so that
66 // the glyph pages do not get polluted with these last-resort glyphs. The 66 // the glyph pages do not get polluted with these last-resort glyphs. The
67 // system fallback page is not populated at construction like the other pages, 67 // system fallback page is not populated at construction like the other pages,
68 // but on demand for each glyph, because the system may need to use different 68 // but on demand for each glyph, because the system may need to use different
69 // fallback fonts for each. This lazy population is done by the Font. 69 // fallback fonts for each. This lazy population is done by the Font.
70 class GlyphPageTreeNode { 70 class PLATFORM_EXPORT GlyphPageTreeNode {
71 WTF_MAKE_FAST_ALLOCATED; 71 WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(GlyphPageTreeNode);
72 public: 72 public:
73 static GlyphPageTreeNode* getRootChild(const FontData* fontData, unsigned pa geNumber) 73 static GlyphPageTreeNode* getRootChild(const FontData* fontData, unsigned pa geNumber)
74 { 74 {
75 return getRoot(pageNumber)->getChild(fontData, pageNumber); 75 return getRoot(pageNumber)->getChild(fontData, pageNumber);
76 } 76 }
77 77
78 static void pruneTreeCustomFontData(const FontData*); 78 static void pruneTreeCustomFontData(const FontData*);
79 static void pruneTreeFontData(const SimpleFontData*); 79 static void pruneTreeFontData(const SimpleFontData*);
80 80
81 void pruneCustomFontData(const FontData*); 81 void pruneCustomFontData(const FontData*);
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132 unsigned m_pageNumber; 132 unsigned m_pageNumber;
133 133
134 friend void ::showGlyphPageTrees(); 134 friend void ::showGlyphPageTrees();
135 friend void ::showGlyphPageTree(unsigned pageNumber); 135 friend void ::showGlyphPageTree(unsigned pageNumber);
136 #endif 136 #endif
137 }; 137 };
138 138
139 } // namespace WebCore 139 } // namespace WebCore
140 140
141 #endif // GlyphPageTreeNode_h 141 #endif // GlyphPageTreeNode_h
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