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30 #include "platform/fonts/FontFallbackList.h"
32 #include "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 fontData = FontCache::fontCache()->getLastResortFallbackFont(fontDescription).get();
135 if (fontData->isSegmented() && !toSegmentedFontData(fontData)->containsCharacter(' '))
138 // When a custom font is loading, we should use the correct fallback font to layout the text.
139 // Here skip the temporary font for the loading custom font which may not act as the correct fallback font.
140 if (!fontData->isLoadingFallback())
143 // Begin to load the first custom font if needed.
144 if (shouldLoadCustomFont) {
145 shouldLoadCustomFont = false;
146 const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(' ');
147 if (simpleFontData && simpleFontData->customFontData())
148 simpleFontData->customFontData()->beginLoadIfNeeded();
153 PassRefPtr<FontData> FontFallbackList::getFontData(const FontDescription& fontDescription, int& familyIndex) const
155 RefPtr<FontData> result;
157 int startIndex = familyIndex;
158 const FontFamily* startFamily = &fontDescription.family();
159 for (int i = 0; startFamily && i < startIndex; i++)
160 startFamily = startFamily->next();
161 const FontFamily* currFamily = startFamily;
162 while (currFamily && !result) {
164 if (currFamily->family().length()) {
166 result = m_fontSelector->getFontData(fontDescription, currFamily->family());
169 result = FontCache::fontCache()->getFontData(fontDescription, currFamily->family());
171 currFamily = currFamily->next();
175 familyIndex = cAllFamiliesScanned;
177 if (result || startIndex)
178 return result.release();
180 // If it's the primary font that we couldn't find, we try the following. In all other cases, we will
181 // just use per-character system fallback.
183 if (m_fontSelector) {
184 // Try the user's preferred standard font.
185 if (RefPtr<FontData> data = m_fontSelector->getFontData(fontDescription, FontFamilyNames::webkit_standard))
186 return data.release();
189 // Still no result. Hand back our last resort fallback font.
190 return FontCache::fontCache()->getLastResortFallbackFont(fontDescription);
194 const FontData* FontFallbackList::fontDataAt(const FontDescription& fontDescription, unsigned realizedFontIndex) const
196 if (realizedFontIndex < m_fontList.size())
197 return m_fontList[realizedFontIndex].get(); // This fallback font is already in our list.
199 // Make sure we're not passing in some crazy value here.
200 ASSERT(realizedFontIndex == m_fontList.size());
202 if (m_familyIndex == cAllFamiliesScanned)
205 // Ask the font cache for the font data.
206 // We are obtaining this font for the first time. We keep track of the families we've looked at before
207 // in |m_familyIndex|, so that we never scan the same spot in the list twice. getFontData will adjust our
208 // |m_familyIndex| as it scans for the right font to make.
209 ASSERT(FontCache::fontCache()->generation() == m_generation);
210 RefPtr<FontData> result = getFontData(fontDescription, m_familyIndex);
212 m_fontList.append(result);
213 if (result->isLoadingFallback())
214 m_hasLoadingFallback = true;