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1 /* | |
2 * Copyright (C) 2006, 2009 Apple Inc. All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions | |
6 * are met: | |
7 * | |
8 * 1. Redistributions of source code must retain the above copyright | |
9 * notice, this list of conditions and the following disclaimer. | |
10 * 2. Redistributions in binary form must reproduce the above copyright | |
11 * notice, this list of conditions and the following disclaimer in the | |
12 * documentation and/or other materials provided with the distribution. | |
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
14 * its contributors may be used to endorse or promote products derived | |
15 * from this software without specific prior written permission. | |
16 * | |
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 */ | |
28 | |
29 #ifndef GlyphMetricsMap_h | |
30 #define GlyphMetricsMap_h | |
31 | |
32 #include "platform/fonts/Glyph.h" | |
33 #include "platform/geometry/FloatRect.h" | |
34 #include "wtf/Assertions.h" | |
35 #include "wtf/HashMap.h" | |
36 #include "wtf/OwnPtr.h" | |
37 #include "wtf/PassOwnPtr.h" | |
38 #include "wtf/unicode/Unicode.h" | |
39 | |
40 namespace WebCore { | |
41 | |
42 const float cGlyphSizeUnknown = -1; | |
43 | |
44 template<class T> class GlyphMetricsMap { | |
45 WTF_MAKE_NONCOPYABLE(GlyphMetricsMap); | |
46 public: | |
47 GlyphMetricsMap() : m_filledPrimaryPage(false) { } | |
48 T metricsForGlyph(Glyph glyph) | |
49 { | |
50 return locatePage(glyph / GlyphMetricsPage::size)->metricsForGlyph(glyph
); | |
51 } | |
52 | |
53 void setMetricsForGlyph(Glyph glyph, const T& metrics) | |
54 { | |
55 locatePage(glyph / GlyphMetricsPage::size)->setMetricsForGlyph(glyph, me
trics); | |
56 } | |
57 | |
58 private: | |
59 class GlyphMetricsPage { | |
60 public: | |
61 static const size_t size = 256; // Usually covers Latin-1 in a single pa
ge. | |
62 | |
63 T metricsForGlyph(Glyph glyph) const { return m_metrics[glyph % size]; } | |
64 void setMetricsForGlyph(Glyph glyph, const T& metrics) | |
65 { | |
66 setMetricsForIndex(glyph % size, metrics); | |
67 } | |
68 void setMetricsForIndex(unsigned index, const T& metrics) | |
69 { | |
70 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
71 m_metrics[index] = metrics; | |
72 } | |
73 | |
74 private: | |
75 T m_metrics[size]; | |
76 }; | |
77 | |
78 GlyphMetricsPage* locatePage(unsigned pageNumber) | |
79 { | |
80 if (!pageNumber && m_filledPrimaryPage) | |
81 return &m_primaryPage; | |
82 return locatePageSlowCase(pageNumber); | |
83 } | |
84 | |
85 GlyphMetricsPage* locatePageSlowCase(unsigned pageNumber); | |
86 | |
87 static T unknownMetrics(); | |
88 | |
89 bool m_filledPrimaryPage; | |
90 GlyphMetricsPage m_primaryPage; // We optimize for the page that contains gl
yph indices 0-255. | |
91 OwnPtr<HashMap<int, OwnPtr<GlyphMetricsPage> > > m_pages; | |
92 }; | |
93 | |
94 template<> inline float GlyphMetricsMap<float>::unknownMetrics() | |
95 { | |
96 return cGlyphSizeUnknown; | |
97 } | |
98 | |
99 template<> inline FloatRect GlyphMetricsMap<FloatRect>::unknownMetrics() | |
100 { | |
101 return FloatRect(0, 0, cGlyphSizeUnknown, cGlyphSizeUnknown); | |
102 } | |
103 | |
104 template<class T> typename GlyphMetricsMap<T>::GlyphMetricsPage* GlyphMetricsMap
<T>::locatePageSlowCase(unsigned pageNumber) | |
105 { | |
106 GlyphMetricsPage* page; | |
107 if (!pageNumber) { | |
108 ASSERT(!m_filledPrimaryPage); | |
109 page = &m_primaryPage; | |
110 m_filledPrimaryPage = true; | |
111 } else { | |
112 if (m_pages) { | |
113 if ((page = m_pages->get(pageNumber))) | |
114 return page; | |
115 } else | |
116 m_pages = adoptPtr(new HashMap<int, OwnPtr<GlyphMetricsPage> >); | |
117 page = new GlyphMetricsPage; | |
118 m_pages->set(pageNumber, adoptPtr(page)); | |
119 } | |
120 | |
121 // Fill in the whole page with the unknown glyph information. | |
122 for (unsigned i = 0; i < GlyphMetricsPage::size; i++) | |
123 page->setMetricsForIndex(i, unknownMetrics()); | |
124 | |
125 return page; | |
126 } | |
127 | |
128 } // namespace WebCore | |
129 | |
130 #endif | |
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