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| 1 /* | |
| 2 * Copyright (C) 2006 Apple Computer, 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 #include "config.h" | |
| 30 #include "core/platform/graphics/FontFallbackList.h" | |
| 31 | |
| 32 #include "FontFamilyNames.h" | |
| 33 #include "core/platform/graphics/FontCache.h" | |
| 34 #include "core/platform/graphics/SegmentedFontData.h" | |
| 35 #include "platform/fonts/FontDescription.h" | |
| 36 #include "platform/fonts/FontFamily.h" | |
| 37 | |
| 38 namespace WebCore { | |
| 39 | |
| 40 FontFallbackList::FontFallbackList() | |
| 41 : m_pageZero(0) | |
| 42 , m_cachedPrimarySimpleFontData(0) | |
| 43 , m_fontSelector(0) | |
| 44 , m_fontSelectorVersion(0) | |
| 45 , m_familyIndex(0) | |
| 46 , m_generation(fontCache()->generation()) | |
| 47 , m_pitch(UnknownPitch) | |
| 48 , m_loadingCustomFonts(false) | |
| 49 { | |
| 50 } | |
| 51 | |
| 52 void FontFallbackList::invalidate(PassRefPtr<FontSelector> fontSelector) | |
| 53 { | |
| 54 releaseFontData(); | |
| 55 m_fontList.clear(); | |
| 56 m_pageZero = 0; | |
| 57 m_pages.clear(); | |
| 58 m_cachedPrimarySimpleFontData = 0; | |
| 59 m_familyIndex = 0; | |
| 60 m_pitch = UnknownPitch; | |
| 61 m_loadingCustomFonts = false; | |
| 62 m_fontSelector = fontSelector; | |
| 63 m_fontSelectorVersion = m_fontSelector ? m_fontSelector->version() : 0; | |
| 64 m_generation = fontCache()->generation(); | |
| 65 m_widthCache.clear(); | |
| 66 } | |
| 67 | |
| 68 void FontFallbackList::releaseFontData() | |
| 69 { | |
| 70 unsigned numFonts = m_fontList.size(); | |
| 71 for (unsigned i = 0; i < numFonts; ++i) { | |
| 72 if (!m_fontList[i]->isCustomFont()) { | |
| 73 ASSERT(!m_fontList[i]->isSegmented()); | |
| 74 fontCache()->releaseFontData(static_cast<const SimpleFontData*>(m_fo
ntList[i].get())); | |
| 75 } | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 void FontFallbackList::determinePitch(const FontDescription& fontDescription) co
nst | |
| 80 { | |
| 81 const FontData* fontData = primaryFontData(fontDescription); | |
| 82 if (!fontData->isSegmented()) | |
| 83 m_pitch = static_cast<const SimpleFontData*>(fontData)->pitch(); | |
| 84 else { | |
| 85 const SegmentedFontData* segmentedFontData = static_cast<const Segmented
FontData*>(fontData); | |
| 86 unsigned numRanges = segmentedFontData->numRanges(); | |
| 87 if (numRanges == 1 && segmentedFontData->rangeAt(0).isEntireRange()) | |
| 88 m_pitch = segmentedFontData->rangeAt(0).fontData()->pitch(); | |
| 89 else | |
| 90 m_pitch = VariablePitch; | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 bool FontFallbackList::loadingCustomFonts() const | |
| 95 { | |
| 96 if (m_loadingCustomFonts) | |
| 97 return true; | |
| 98 | |
| 99 unsigned numFonts = m_fontList.size(); | |
| 100 for (unsigned i = 0; i < numFonts; ++i) { | |
| 101 if (m_fontList[i]->isCustomFont() && m_fontList[i]->isLoading()) { | |
| 102 m_loadingCustomFonts = true; | |
| 103 return true; | |
| 104 } | |
| 105 } | |
| 106 return false; | |
| 107 } | |
| 108 | |
| 109 const FontData* FontFallbackList::primaryFontData(const FontDescription& fontDes
cription) const | |
| 110 { | |
| 111 for (unsigned fontIndex = 0; ; ++fontIndex) { | |
| 112 const FontData* fontData = fontDataAt(fontDescription, fontIndex); | |
| 113 if (!fontData) { | |
| 114 // All fonts are custom fonts and are loading. Return the first Font
Data. | |
| 115 // FIXME: Correct fallback to the default font. | |
| 116 return fontDataAt(fontDescription, 0); | |
| 117 } | |
| 118 | |
| 119 // When a custom font is loading, we should use the correct fallback fon
t to layout the text. | |
| 120 // Here skip the temporary font for the loading custom font which may no
t act as the correct fallback font. | |
| 121 if (!fontData->isLoadingFallback()) | |
| 122 return fontData; | |
| 123 | |
| 124 // Begin to load the first custom font if needed. | |
| 125 if (!fontIndex) { | |
| 126 const SimpleFontData* simpleFontData = fontData->fontDataForCharacte
r(' '); | |
| 127 if (simpleFontData && simpleFontData->customFontData()) | |
| 128 simpleFontData->customFontData()->beginLoadIfNeeded(); | |
| 129 } | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 PassRefPtr<FontData> FontFallbackList::getFontData(const FontDescription& fontDe
scription, int& familyIndex) const | |
| 134 { | |
| 135 RefPtr<FontData> result; | |
| 136 | |
| 137 int startIndex = familyIndex; | |
| 138 const FontFamily* startFamily = &fontDescription.family(); | |
| 139 for (int i = 0; startFamily && i < startIndex; i++) | |
| 140 startFamily = startFamily->next(); | |
| 141 const FontFamily* currFamily = startFamily; | |
| 142 while (currFamily && !result) { | |
| 143 familyIndex++; | |
| 144 if (currFamily->family().length()) { | |
| 145 if (m_fontSelector) | |
| 146 result = m_fontSelector->getFontData(fontDescription, currFamily
->family()); | |
| 147 | |
| 148 if (!result) | |
| 149 result = fontCache()->getFontData(fontDescription, currFamily->f
amily()); | |
| 150 } | |
| 151 currFamily = currFamily->next(); | |
| 152 } | |
| 153 | |
| 154 if (!currFamily) | |
| 155 familyIndex = cAllFamiliesScanned; | |
| 156 | |
| 157 if (result || startIndex) | |
| 158 return result.release(); | |
| 159 | |
| 160 // If it's the primary font that we couldn't find, we try the following. In
all other cases, we will | |
| 161 // just use per-character system fallback. | |
| 162 | |
| 163 if (m_fontSelector) { | |
| 164 // Try the user's preferred standard font. | |
| 165 if (RefPtr<FontData> data = m_fontSelector->getFontData(fontDescription,
FontFamilyNames::webkit_standard)) | |
| 166 return data.release(); | |
| 167 } | |
| 168 | |
| 169 // Still no result. Hand back our last resort fallback font. | |
| 170 return fontCache()->getLastResortFallbackFont(fontDescription); | |
| 171 } | |
| 172 | |
| 173 | |
| 174 const FontData* FontFallbackList::fontDataAt(const FontDescription& fontDescript
ion, unsigned realizedFontIndex) const | |
| 175 { | |
| 176 if (realizedFontIndex < m_fontList.size()) | |
| 177 return m_fontList[realizedFontIndex].get(); // This fallback font is alr
eady in our list. | |
| 178 | |
| 179 // Make sure we're not passing in some crazy value here. | |
| 180 ASSERT(realizedFontIndex == m_fontList.size()); | |
| 181 | |
| 182 if (m_familyIndex == cAllFamiliesScanned) | |
| 183 return 0; | |
| 184 | |
| 185 // Ask the font cache for the font data. | |
| 186 // We are obtaining this font for the first time. We keep track of the fami
lies we've looked at before | |
| 187 // in |m_familyIndex|, so that we never scan the same spot in the list twice
. getFontData will adjust our | |
| 188 // |m_familyIndex| as it scans for the right font to make. | |
| 189 ASSERT(fontCache()->generation() == m_generation); | |
| 190 RefPtr<FontData> result = getFontData(fontDescription, m_familyIndex); | |
| 191 if (result) { | |
| 192 m_fontList.append(result); | |
| 193 if (result->isLoading()) | |
| 194 m_loadingCustomFonts = true; | |
| 195 } | |
| 196 return result.get(); | |
| 197 } | |
| 198 | |
| 199 void FontFallbackList::setPlatformFont(const FontPlatformData& platformData) | |
| 200 { | |
| 201 m_familyIndex = cAllFamiliesScanned; | |
| 202 ASSERT(fontCache()->generation() == m_generation); | |
| 203 RefPtr<FontData> fontData = fontCache()->fontDataFromFontPlatformData(&platf
ormData); | |
| 204 m_fontList.append(fontData); | |
| 205 } | |
| 206 | |
| 207 } | |
| OLD | NEW |
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Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk