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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/PlatformExport.h" | |
| 34 #include "platform/fonts/CustomFontData.h" | |
| 35 #include "platform/fonts/Glyph.h" | |
| 36 #include "wtf/Allocator.h" | |
| 37 #include "wtf/PassRefPtr.h" | |
| 38 #include "wtf/RefCounted.h" | |
| 39 #include "wtf/RefPtr.h" | |
| 40 #include "wtf/allocator/Partitions.h" | |
| 41 #include "wtf/text/Unicode.h" | |
| 42 #include <string.h> | |
| 43 | |
| 44 namespace blink { | |
| 45 | |
| 46 class SimpleFontData; | |
| 47 class GlyphPageTreeNodeBase; | |
| 48 | |
| 49 // Holds the glyph index and the corresponding SimpleFontData information for a | |
| 50 // given character. | |
| 51 struct GlyphData { | |
| 52 DISALLOW_NEW(); | |
| 53 GlyphData(Glyph g = 0, const SimpleFontData* f = 0) : glyph(g), fontData(f) {} | |
| 54 Glyph glyph; | |
| 55 const SimpleFontData* fontData; | |
| 56 }; | |
| 57 | |
| 58 #if COMPILER(MSVC) | |
| 59 #pragma warning(push) | |
| 60 #pragma warning( \ | |
| 61 disable : 4200) // Disable "zero-sized array in struct/union" warning | |
| 62 #endif | |
| 63 | |
| 64 // A GlyphPage contains a fixed-size set of GlyphData mappings for a contiguous | |
| 65 // range of characters in the Unicode code space. GlyphPages are indexed | |
| 66 // starting from 0 and incrementing for each 256 glyphs. | |
| 67 // | |
| 68 // One page may actually include glyphs from other fonts if the characters are | |
| 69 // missing in the primary font. It is owned by exactly one GlyphPageTreeNode, | |
| 70 // although multiple nodes may reference it as their "page" if they are supposed | |
| 71 // to be overriding the parent's node, but provide no additional information. | |
| 72 class PLATFORM_EXPORT GlyphPage : public RefCounted<GlyphPage> { | |
| 73 public: | |
| 74 static PassRefPtr<GlyphPage> createForMixedFontData( | |
| 75 GlyphPageTreeNodeBase* owner) { | |
| 76 void* slot = WTF::Partitions::fastMalloc( | |
| 77 sizeof(GlyphPage) + sizeof(SimpleFontData*) * GlyphPage::size, | |
| 78 WTF_HEAP_PROFILER_TYPE_NAME(GlyphPage)); | |
| 79 return adoptRef(new (slot) GlyphPage(owner)); | |
| 80 } | |
| 81 | |
| 82 static PassRefPtr<GlyphPage> createForSingleFontData( | |
| 83 GlyphPageTreeNodeBase* owner, | |
| 84 const SimpleFontData* fontData) { | |
| 85 ASSERT(fontData); | |
| 86 return adoptRef(new GlyphPage(owner, fontData)); | |
| 87 } | |
| 88 | |
| 89 PassRefPtr<GlyphPage> createCopiedSystemFallbackPage( | |
| 90 GlyphPageTreeNodeBase* owner) const { | |
| 91 RefPtr<GlyphPage> page = GlyphPage::createForMixedFontData(owner); | |
| 92 memcpy(page->m_glyphs, m_glyphs, sizeof(m_glyphs)); | |
| 93 if (hasPerGlyphFontData()) | |
| 94 memcpy(page->m_perGlyphFontData, m_perGlyphFontData, | |
| 95 sizeof(SimpleFontData*) * GlyphPage::size); | |
| 96 else { | |
| 97 for (size_t i = 0; i < GlyphPage::size; ++i) { | |
| 98 page->m_perGlyphFontData[i] = m_glyphs[i] ? m_fontDataForAllGlyphs : 0; | |
| 99 } | |
| 100 } | |
| 101 page->m_customFontToLoad = m_customFontToLoad; | |
| 102 return page.release(); | |
| 103 } | |
| 104 | |
| 105 ~GlyphPage() {} | |
| 106 | |
| 107 static const unsigned char sizeBits = 8; | |
| 108 static const size_t size = | |
| 109 (1 << GlyphPage::sizeBits); // Covers Latin-1 in a single page. | |
| 110 static unsigned indexForCharacter(UChar32 c) { return c & 0xFF; } | |
| 111 | |
| 112 ALWAYS_INLINE GlyphData glyphDataForCharacter(UChar32 c) const { | |
| 113 unsigned index = indexForCharacter(c); | |
| 114 if (const CustomFontData* customData = customFontToLoadAt(index)) | |
| 115 customData->beginLoadIfNeeded(); | |
| 116 return glyphDataForIndex(index); | |
| 117 } | |
| 118 | |
| 119 ALWAYS_INLINE GlyphData glyphDataForIndex(unsigned index) const { | |
| 120 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
| 121 Glyph glyph = m_glyphs[index]; | |
| 122 if (hasPerGlyphFontData()) | |
| 123 return GlyphData(glyph, m_perGlyphFontData[index]); | |
| 124 return GlyphData(glyph, glyph ? m_fontDataForAllGlyphs : 0); | |
| 125 } | |
| 126 | |
| 127 ALWAYS_INLINE Glyph glyphForCharacter(UChar32 c) const { | |
| 128 return glyphAt(indexForCharacter(c)); | |
| 129 } | |
| 130 | |
| 131 ALWAYS_INLINE Glyph glyphAt(unsigned index) const { | |
| 132 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
| 133 return m_glyphs[index]; | |
| 134 } | |
| 135 | |
| 136 void setGlyphDataForCharacter(UChar32 c, Glyph g, const SimpleFontData* f) { | |
| 137 setGlyphDataForIndex(indexForCharacter(c), g, f); | |
| 138 } | |
| 139 | |
| 140 void setGlyphDataForIndex(unsigned index, | |
| 141 Glyph glyph, | |
| 142 const SimpleFontData* fontData) { | |
| 143 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
| 144 m_glyphs[index] = glyph; | |
| 145 setCustomFontToLoad(index, 0); | |
| 146 | |
| 147 if (hasPerGlyphFontData()) { | |
| 148 m_perGlyphFontData[index] = fontData; | |
| 149 } else { | |
| 150 // A single-font GlyphPage already assigned m_fontDataForAllGlyphs in the | |
| 151 // constructor. | |
| 152 ASSERT(!glyph || fontData == m_fontDataForAllGlyphs); | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 void setGlyphDataForIndex(unsigned index, const GlyphData& glyphData) { | |
| 157 setGlyphDataForIndex(index, glyphData.glyph, glyphData.fontData); | |
| 158 } | |
| 159 | |
| 160 const CustomFontData* customFontToLoadAt(unsigned index) const { | |
| 161 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
| 162 return m_customFontToLoad ? m_customFontToLoad->at(index) : 0; | |
| 163 } | |
| 164 | |
| 165 void setCustomFontToLoad(unsigned index, | |
| 166 const CustomFontData* customFontToLoad) { | |
| 167 if (!m_customFontToLoad) { | |
| 168 if (!customFontToLoad) | |
| 169 return; | |
| 170 m_customFontToLoad = CustomDataPage::create(); | |
| 171 } | |
| 172 ASSERT_WITH_SECURITY_IMPLICATION(index < size); | |
| 173 m_customFontToLoad->set(index, customFontToLoad); | |
| 174 } | |
| 175 | |
| 176 void removePerGlyphFontData(const SimpleFontData* fontData) { | |
| 177 // This method should only be called on the mixed page, which is never | |
| 178 // single-font. | |
| 179 ASSERT(hasPerGlyphFontData()); | |
| 180 for (size_t i = 0; i < size; ++i) { | |
| 181 if (m_perGlyphFontData[i] == fontData) { | |
| 182 m_glyphs[i] = 0; | |
| 183 m_perGlyphFontData[i] = 0; | |
| 184 } | |
| 185 } | |
| 186 } | |
| 187 | |
| 188 GlyphPageTreeNodeBase* owner() const { return m_owner; } | |
| 189 | |
| 190 bool hasPerGlyphFontData() const { return !m_fontDataForAllGlyphs; } | |
| 191 | |
| 192 private: | |
| 193 explicit GlyphPage(GlyphPageTreeNodeBase* owner, | |
| 194 const SimpleFontData* fontDataForAllGlyphs = 0) | |
| 195 : m_fontDataForAllGlyphs(fontDataForAllGlyphs), m_owner(owner) { | |
| 196 memset(m_glyphs, 0, sizeof(m_glyphs)); | |
| 197 if (hasPerGlyphFontData()) | |
| 198 memset(m_perGlyphFontData, 0, sizeof(SimpleFontData*) * GlyphPage::size); | |
| 199 } | |
| 200 | |
| 201 class CustomDataPage : public RefCounted<CustomDataPage> { | |
| 202 public: | |
| 203 static RefPtr<CustomDataPage> create() { | |
| 204 return adoptRef(new CustomDataPage()); | |
| 205 } | |
| 206 const CustomFontData* at(size_t index) const { return m_customData[index]; } | |
| 207 void set(size_t index, const CustomFontData* data) { | |
| 208 m_customData[index] = data; | |
| 209 } | |
| 210 | |
| 211 private: | |
| 212 CustomDataPage() { memset(m_customData, 0, sizeof(m_customData)); } | |
| 213 const CustomFontData* m_customData[size]; | |
| 214 }; | |
| 215 | |
| 216 const SimpleFontData* m_fontDataForAllGlyphs; | |
| 217 GlyphPageTreeNodeBase* m_owner; | |
| 218 RefPtr<CustomDataPage> m_customFontToLoad; | |
| 219 Glyph m_glyphs[size]; | |
| 220 | |
| 221 // NOTE: This array has (GlyphPage::size) elements if m_fontDataForAllGlyphs | |
| 222 // is null. | |
| 223 const SimpleFontData* m_perGlyphFontData[0]; | |
| 224 }; | |
| 225 | |
| 226 #if COMPILER(MSVC) | |
| 227 #pragma warning(pop) | |
| 228 #endif | |
| 229 | |
| 230 } // namespace blink | |
| 231 | |
| 232 #endif // GlyphPage_h | |
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Chromium Code Reviews
Issue 1479003002:
Remove Simple Text Path (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master