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30 #include "platform/fonts/FontFallbackList.h"
32 #include "platform/FontFamilyNames.h"
33 #include "platform/fonts/FontCache.h"
34 #include "platform/fonts/FontDescription.h"
35 #include "platform/fonts/FontFamily.h"
36 #include "platform/fonts/SegmentedFontData.h"
40 FontFallbackList::FontFallbackList()
42 , m_cachedPrimarySimpleFontData(0)
43 , m_fontSelector(nullptr)
44 , m_fontSelectorVersion(0)
46 , m_generation(FontCache::fontCache()->generation())
47 , m_pitch(UnknownPitch)
48 , m_hasLoadingFallback(false)
52 void FontFallbackList::invalidate(PassRefPtrWillBeRawPtr<FontSelector> fontSelector)
58 m_cachedPrimarySimpleFontData = 0;
60 m_pitch = UnknownPitch;
61 m_hasLoadingFallback = false;
62 m_fontSelector = fontSelector;
63 m_fontSelectorVersion = m_fontSelector ? m_fontSelector->version() : 0;
64 m_generation = FontCache::fontCache()->generation();
68 void FontFallbackList::releaseFontData()
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::fontCache()->releaseFontData(static_cast<const SimpleFontData*>(m_fontList[i].get()));
79 void FontFallbackList::determinePitch(const FontDescription& fontDescription) const
81 const FontData* fontData = primaryFontData(fontDescription);
82 if (!fontData->isSegmented())
83 m_pitch = static_cast<const SimpleFontData*>(fontData)->pitch();
85 const SegmentedFontData* segmentedFontData = static_cast<const SegmentedFontData*>(fontData);
86 unsigned numRanges = segmentedFontData->numRanges();
87 if (numRanges == 1 && segmentedFontData->rangeAt(0).isEntireRange())
88 m_pitch = segmentedFontData->rangeAt(0).fontData()->pitch();
90 m_pitch = VariablePitch;
94 bool FontFallbackList::loadingCustomFonts() const
96 if (!m_hasLoadingFallback)
99 unsigned numFonts = m_fontList.size();
100 for (unsigned i = 0; i < numFonts; ++i) {
101 if (m_fontList[i]->isLoading())
107 bool FontFallbackList::shouldSkipDrawing() const
109 if (!m_hasLoadingFallback)
112 unsigned numFonts = m_fontList.size();
113 for (unsigned i = 0; i < numFonts; ++i) {
114 if (m_fontList[i]->shouldSkipDrawing())
120 const FontData* FontFallbackList::primaryFontData(const FontDescription& fontDescription) const
122 bool shouldLoadCustomFont = true;
124 for (unsigned fontIndex = 0; ; ++fontIndex) {
125 const FontData* fontData = fontDataAt(fontDescription, fontIndex);
127 // All fonts are custom fonts and are loading. Return the first FontData.
128 fontData = fontDataAt(fontDescription, 0);
130 return fontData->fontDataForCharacter(' ');
132 SimpleFontData* lastResortFallback = FontCache::fontCache()->getLastResortFallbackFont(fontDescription).get();
133 ASSERT(lastResortFallback);
134 return lastResortFallback;
137 if (fontData->isSegmented() && !toSegmentedFontData(fontData)->containsCharacter(' '))
140 const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(' ');
141 ASSERT(simpleFontData);
143 // When a custom font is loading, we should use the correct fallback font to layout the text.
144 // Here skip the temporary font for the loading custom font which may not act as the correct fallback font.
145 if (!simpleFontData->isLoadingFallback())
148 // Begin to load the first custom font if needed.
149 if (shouldLoadCustomFont) {
150 shouldLoadCustomFont = false;
151 simpleFontData->customFontData()->beginLoadIfNeeded();
156 PassRefPtr<FontData> FontFallbackList::getFontData(const FontDescription& fontDescription, int& familyIndex) const
158 RefPtr<FontData> result;
160 int startIndex = familyIndex;
161 const FontFamily* startFamily = &fontDescription.family();
162 for (int i = 0; startFamily && i < startIndex; i++)
163 startFamily = startFamily->next();
164 const FontFamily* currFamily = startFamily;
165 while (currFamily && !result) {
167 if (currFamily->family().length()) {
169 result = m_fontSelector->getFontData(fontDescription, currFamily->family());
172 result = FontCache::fontCache()->getFontData(fontDescription, currFamily->family());
174 currFamily = currFamily->next();
178 familyIndex = cAllFamiliesScanned;
180 if (result || startIndex)
181 return result.release();
183 // If it's the primary font that we couldn't find, we try the following. In all other cases, we will
184 // just use per-character system fallback.
186 if (m_fontSelector) {
187 // Try the user's preferred standard font.
188 if (RefPtr<FontData> data = m_fontSelector->getFontData(fontDescription, FontFamilyNames::webkit_standard))
189 return data.release();
192 // Still no result. Hand back our last resort fallback font.
193 return FontCache::fontCache()->getLastResortFallbackFont(fontDescription);
197 const FontData* FontFallbackList::fontDataAt(const FontDescription& fontDescription, unsigned realizedFontIndex) const
199 if (realizedFontIndex < m_fontList.size())
200 return m_fontList[realizedFontIndex].get(); // This fallback font is already in our list.
202 // Make sure we're not passing in some crazy value here.
203 ASSERT(realizedFontIndex == m_fontList.size());
205 if (m_familyIndex == cAllFamiliesScanned)
208 // Ask the font cache for the font data.
209 // We are obtaining this font for the first time. We keep track of the families we've looked at before
210 // in |m_familyIndex|, so that we never scan the same spot in the list twice. getFontData will adjust our
211 // |m_familyIndex| as it scans for the right font to make.
212 ASSERT(FontCache::fontCache()->generation() == m_generation);
213 RefPtr<FontData> result = getFontData(fontDescription, m_familyIndex);
215 m_fontList.append(result);
216 if (result->isLoadingFallback())
217 m_hasLoadingFallback = true;