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1 /* | |
2 * Copyright (C) 2006, 2007, 2008, 2013 Apple Inc. All rights reserved. | |
3 * Copyright (C) Research In Motion Limited 2011. All rights reserved. | |
4 * | |
5 * Redistribution and use in source and binary forms, with or without | |
6 * modification, are permitted provided that the following conditions | |
7 * are met: | |
8 * | |
9 * 1. Redistributions of source code must retain the above copyright | |
10 * notice, this list of conditions and the following disclaimer. | |
11 * 2. Redistributions in binary form must reproduce the above copyright | |
12 * notice, this list of conditions and the following disclaimer in the | |
13 * documentation and/or other materials provided with the distribution. | |
14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
15 * its contributors may be used to endorse or promote products derived | |
16 * from this software without specific prior written permission. | |
17 * | |
18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 */ | |
29 | |
30 #ifndef GlyphPage_h | |
31 #define GlyphPage_h | |
32 | |
33 #include "platform/fonts/Glyph.h" | |
34 #include <string.h> | |
35 #include "wtf/PassRefPtr.h" | |
36 #include "wtf/RefCounted.h" | |
37 #include "wtf/RefPtr.h" | |
38 #include "wtf/unicode/Unicode.h" | |
39 | |
40 namespace WebCore { | |
41 | |
42 class SimpleFontData; | |
43 class GlyphPageTreeNode; | |
44 | |
45 // Holds the glyph index and the corresponding SimpleFontData information for a
given | |
46 // character. | |
47 struct GlyphData { | |
48 GlyphData(Glyph g = 0, const SimpleFontData* f = 0) | |
49 : glyph(g) | |
50 , fontData(f) | |
51 { | |
52 } | |
53 Glyph glyph; | |
54 const SimpleFontData* fontData; | |
55 }; | |
56 | |
57 #if COMPILER(MSVC) | |
58 #pragma warning(push) | |
59 #pragma warning(disable: 4200) // Disable "zero-sized array in struct/union" war
ning | |
60 #endif | |
61 | |
62 // A GlyphPage contains a fixed-size set of GlyphData mappings for a contiguous | |
63 // range of characters in the Unicode code space. GlyphPages are indexed | |
64 // starting from 0 and incrementing for each 256 glyphs. | |
65 // | |
66 // One page may actually include glyphs from other fonts if the characters are | |
67 // missing in the primary font. It is owned by exactly one GlyphPageTreeNode, | |
68 // although multiple nodes may reference it as their "page" if they are supposed | |
69 // to be overriding the parent's node, but provide no additional information. | |
70 class GlyphPage : public RefCounted<GlyphPage> { | |
71 public: | |
72 static PassRefPtr<GlyphPage> createForMixedFontData(GlyphPageTreeNode* owner
) | |
73 { | |
74 void* slot = fastMalloc(sizeof(GlyphPage) + sizeof(SimpleFontData*) * Gl
yphPage::size); | |
75 return adoptRef(new (slot) GlyphPage(owner)); | |
76 } | |
77 | |
78 static PassRefPtr<GlyphPage> createForSingleFontData(GlyphPageTreeNode* owne
r, const SimpleFontData* fontData) | |
79 { | |
80 ASSERT(fontData); | |
81 return adoptRef(new GlyphPage(owner, fontData)); | |
82 } | |
83 | |
84 PassRefPtr<GlyphPage> createCopiedSystemFallbackPage(GlyphPageTreeNode* owne
r) const | |
85 { | |
86 RefPtr<GlyphPage> page = GlyphPage::createForMixedFontData(owner); | |
87 memcpy(page->m_glyphs, m_glyphs, sizeof(m_glyphs)); | |
88 if (hasPerGlyphFontData()) | |
89 memcpy(page->m_perGlyphFontData, m_perGlyphFontData, sizeof(SimpleFo
ntData*) * GlyphPage::size); | |
90 else { | |
91 for (size_t i = 0; i < GlyphPage::size; ++i) { | |
92 page->m_perGlyphFontData[i] = m_glyphs[i] ? m_fontDataForAllGlyp
hs : 0; | |
93 } | |
94 } | |
95 return page.release(); | |
96 } | |
97 | |
98 ~GlyphPage() { } | |
99 | |
100 static const size_t size = 256; // Covers Latin-1 in a single page. | |
101 static unsigned indexForCharacter(UChar32 c) { return c % GlyphPage::size; } | |
102 | |
103 ALWAYS_INLINE GlyphData glyphDataForCharacter(UChar32 c) const | |
104 { | |
105 return glyphDataForIndex(indexForCharacter(c)); | |
106 } | |
107 | |
108 ALWAYS_INLINE GlyphData glyphDataForIndex(unsigned index) const | |
109 { | |
110 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
111 Glyph glyph = m_glyphs[index]; | |
112 if (hasPerGlyphFontData()) | |
113 return GlyphData(glyph, m_perGlyphFontData[index]); | |
114 return GlyphData(glyph, glyph ? m_fontDataForAllGlyphs : 0); | |
115 } | |
116 | |
117 ALWAYS_INLINE Glyph glyphForCharacter(UChar32 c) const | |
118 { | |
119 return glyphAt(indexForCharacter(c)); | |
120 } | |
121 | |
122 ALWAYS_INLINE Glyph glyphAt(unsigned index) const | |
123 { | |
124 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
125 return m_glyphs[index]; | |
126 } | |
127 | |
128 ALWAYS_INLINE const SimpleFontData* fontDataForCharacter(UChar32 c) const | |
129 { | |
130 unsigned index = indexForCharacter(c); | |
131 if (hasPerGlyphFontData()) | |
132 return m_perGlyphFontData[index]; | |
133 return m_glyphs[index] ? m_fontDataForAllGlyphs : 0; | |
134 } | |
135 | |
136 void setGlyphDataForCharacter(UChar32 c, Glyph g, const SimpleFontData* f) | |
137 { | |
138 setGlyphDataForIndex(indexForCharacter(c), g, f); | |
139 } | |
140 | |
141 void setGlyphDataForIndex(unsigned index, Glyph glyph, const SimpleFontData*
fontData) | |
142 { | |
143 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
144 m_glyphs[index] = glyph; | |
145 | |
146 // GlyphPage getters will always return a null SimpleFontData* for glyph
#0 if there's no per-glyph font array. | |
147 if (hasPerGlyphFontData()) { | |
148 m_perGlyphFontData[index] = glyph ? fontData : 0; | |
149 return; | |
150 } | |
151 | |
152 // A single-font GlyphPage already assigned m_fontDataForAllGlyphs in th
e constructor. | |
153 ASSERT(!glyph || fontData == m_fontDataForAllGlyphs); | |
154 } | |
155 | |
156 void setGlyphDataForIndex(unsigned index, const GlyphData& glyphData) | |
157 { | |
158 setGlyphDataForIndex(index, glyphData.glyph, glyphData.fontData); | |
159 } | |
160 | |
161 void removeFontDataFromSystemFallbackPage(const SimpleFontData* fontData) | |
162 { | |
163 // This method should only be called on the system fallback page, which
is never single-font. | |
164 ASSERT(hasPerGlyphFontData()); | |
165 for (size_t i = 0; i < size; ++i) { | |
166 if (m_perGlyphFontData[i] == fontData) { | |
167 m_glyphs[i] = 0; | |
168 m_perGlyphFontData[i] = 0; | |
169 } | |
170 } | |
171 } | |
172 | |
173 GlyphPageTreeNode* owner() const { return m_owner; } | |
174 | |
175 // Implemented by the platform. | |
176 bool fill(unsigned offset, unsigned length, UChar* characterBuffer, unsigned
bufferLength, const SimpleFontData*); | |
177 | |
178 private: | |
179 explicit GlyphPage(GlyphPageTreeNode* owner, const SimpleFontData* fontDataF
orAllGlyphs = 0) | |
180 : m_fontDataForAllGlyphs(fontDataForAllGlyphs) | |
181 , m_owner(owner) | |
182 { | |
183 memset(m_glyphs, 0, sizeof(m_glyphs)); | |
184 if (hasPerGlyphFontData()) | |
185 memset(m_perGlyphFontData, 0, sizeof(SimpleFontData*) * GlyphPage::s
ize); | |
186 } | |
187 | |
188 bool hasPerGlyphFontData() const { return !m_fontDataForAllGlyphs; } | |
189 | |
190 const SimpleFontData* m_fontDataForAllGlyphs; | |
191 GlyphPageTreeNode* m_owner; | |
192 Glyph m_glyphs[size]; | |
193 | |
194 // NOTE: This array has (GlyphPage::size) elements if m_fontDataForAllGlyphs
is null. | |
195 const SimpleFontData* m_perGlyphFontData[0]; | |
196 }; | |
197 | |
198 #if COMPILER(MSVC) | |
199 #pragma warning(pop) | |
200 #endif | |
201 | |
202 } // namespace WebCore | |
203 | |
204 #endif // GlyphPage_h | |
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