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

Issue 2386333002: reflow comments in platform/fonts (Closed)
Patch Set: comments Created 4 years, 2 months 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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36 #include "wtf/text/Unicode.h" 36 #include "wtf/text/Unicode.h"
37 #include <memory> 37 #include <memory>
38 #include <string.h> 38 #include <string.h>
39 #include <unicode/uscript.h> 39 #include <unicode/uscript.h>
40 40
41 namespace blink { 41 namespace blink {
42 42
43 class FontData; 43 class FontData;
44 class SimpleFontData; 44 class SimpleFontData;
45 45
46 // The glyph page tree is a data structure that maps (FontData, glyph page numbe r) 46 // The glyph page tree is a data structure that maps (FontData, glyph page
47 // to a GlyphPage. Level 0 (the "root") is special. There is one root 47 // number) to a GlyphPage. Level 0 (the "root") is special. There is one root
48 // GlyphPageTreeNode for each glyph page number. The roots do not have a 48 // GlyphPageTreeNode for each glyph page number. The roots do not have a
49 // GlyphPage associated with them, and their initializePage() function is never 49 // GlyphPage associated with them, and their initializePage() function is never
50 // called to fill the glyphs. 50 // called to fill the glyphs.
51 // 51 //
52 // Each root node maps a FontData pointer to another GlyphPageTreeNode at 52 // Each root node maps a FontData pointer to another GlyphPageTreeNode at
53 // level 1 (the "root child") that stores the actual glyphs for a specific font data. 53 // level 1 (the "root child") that stores the actual glyphs for a specific font
54 // These nodes will only have a GlyphPage if they have glyphs for that range. 54 // data. These nodes will only have a GlyphPage if they have glyphs for that
55 // range.
55 // 56 //
56 // Levels greater than one correspond to subsequent levels of the fallback list 57 // Levels greater than one correspond to subsequent levels of the fallback list
57 // for that font. These levels override their parent's page of glyphs by 58 // for that font. These levels override their parent's page of glyphs by
58 // filling in holes with the new font (thus making a more complete page). 59 // filling in holes with the new font (thus making a more complete page).
59 // 60 //
60 // A SystemFallbackGlyphPageTreeNode is a special leaf node of the glyph tree 61 // A SystemFallbackGlyphPageTreeNode is a special leaf node of the glyph tree
61 // which is for tracking the glyph page for a system fallback font. 62 // which is for tracking the glyph page for a system fallback font.
62 // The glyph page is tracked separately from the regular pages and overrides 63 // The glyph page is tracked separately from the regular pages and overrides
63 // so that the glyph pages do not get polluted with these last-resort glyphs. 64 // so that the glyph pages do not get polluted with these last-resort glyphs.
64 // The system fallback page is not populated at construction like the other page s, 65 // The system fallback page is not populated at construction like the other
65 // but on demand for each glyph, because the system may need to use different 66 // pages, but on demand for each glyph, because the system may need to use
66 // fallback fonts for each. This lazy population is done by the Font. 67 // different fallback fonts for each. This lazy population is done by the Font.
67 68
68 class GlyphPageTreeNode; 69 class GlyphPageTreeNode;
69 class SystemFallbackGlyphPageTreeNode; 70 class SystemFallbackGlyphPageTreeNode;
70 71
71 class PLATFORM_EXPORT GlyphPageTreeNodeBase { 72 class PLATFORM_EXPORT GlyphPageTreeNodeBase {
72 USING_FAST_MALLOC(GlyphPageTreeNodeBase); 73 USING_FAST_MALLOC(GlyphPageTreeNodeBase);
73 WTF_MAKE_NONCOPYABLE(GlyphPageTreeNodeBase); 74 WTF_MAKE_NONCOPYABLE(GlyphPageTreeNodeBase);
74 75
75 public: 76 public:
76 GlyphPageTreeNode* parent() const { return m_parent; } 77 GlyphPageTreeNode* parent() const { return m_parent; }
77 78
78 // Returns the level of this node. See class-level comment. 79 // Returns the level of this node. See class-level comment.
79 unsigned level() const { return m_level; } 80 unsigned level() const { return m_level; }
80 81
81 // The system fallback font has special rules (see above). 82 // The system fallback font has special rules (see above).
82 bool isSystemFallback() const { return m_isSystemFallback; } 83 bool isSystemFallback() const { return m_isSystemFallback; }
83 84
84 // Returns a page of glyphs (or null if there are no glyphs in this page's cha racter range). 85 // Returns a page of glyphs (or null if there are no glyphs in this page's
86 // character range).
85 virtual GlyphPage* page(UScriptCode = USCRIPT_COMMON) = 0; 87 virtual GlyphPage* page(UScriptCode = USCRIPT_COMMON) = 0;
86 88
87 protected: 89 protected:
88 GlyphPageTreeNodeBase(GlyphPageTreeNode* parent, bool isSystemFallback); 90 GlyphPageTreeNodeBase(GlyphPageTreeNode* parent, bool isSystemFallback);
89 virtual ~GlyphPageTreeNodeBase() {} 91 virtual ~GlyphPageTreeNodeBase() {}
90 92
91 GlyphPageTreeNode* m_parent; 93 GlyphPageTreeNode* m_parent;
92 unsigned m_level : 31; 94 unsigned m_level : 31;
93 unsigned m_isSystemFallback : 1; 95 unsigned m_isSystemFallback : 1;
94 unsigned m_customFontCount; 96 unsigned m_customFontCount;
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208 const FontData* fontData, 210 const FontData* fontData,
209 unsigned pageNumber) { 211 unsigned pageNumber) {
210 if (fontData) 212 if (fontData)
211 return getNormalChild(fontData, pageNumber); 213 return getNormalChild(fontData, pageNumber);
212 return getSystemFallbackChild(pageNumber); 214 return getSystemFallbackChild(pageNumber);
213 } 215 }
214 216
215 } // namespace blink 217 } // namespace blink
216 218
217 #endif // GlyphPageTreeNode_h 219 #endif // GlyphPageTreeNode_h
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