2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
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)
44 , m_fontSelectorVersion(0)
46 , m_generation(FontCache::fontCache()->generation())
47 , m_pitch(UnknownPitch)
48 , m_loadingCustomFonts(false)
52 void FontFallbackList::invalidate(PassRefPtr<FontSelector> fontSelector)
58 m_cachedPrimarySimpleFontData = 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::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_loadingCustomFonts)
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;
109 const FontData* FontFallbackList::primaryFontData(const FontDescription& fontDescription) const
111 for (unsigned fontIndex = 0; ; ++fontIndex) {
112 const FontData* fontData = fontDataAt(fontDescription, fontIndex);
114 // All fonts are custom fonts and are loading. Return the first FontData.
115 // FIXME: Correct fallback to the default font.
116 return fontDataAt(fontDescription, 0);
119 // When a custom font is loading, we should use the correct fallback font to layout the text.
120 // Here skip the temporary font for the loading custom font which may not act as the correct fallback font.
121 if (!fontData->isLoadingFallback())
124 // Begin to load the first custom font if needed.
126 const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(' ');
127 if (simpleFontData && simpleFontData->customFontData())
128 simpleFontData->customFontData()->beginLoadIfNeeded();
133 PassRefPtr<FontData> FontFallbackList::getFontData(const FontDescription& fontDescription, int& familyIndex) const
135 RefPtr<FontData> result;
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) {
144 if (currFamily->family().length()) {
146 result = m_fontSelector->getFontData(fontDescription, currFamily->family());
149 result = FontCache::fontCache()->getFontData(fontDescription, currFamily->family());
151 currFamily = currFamily->next();
155 familyIndex = cAllFamiliesScanned;
157 if (result || startIndex)
158 return result.release();
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.
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();
169 // Still no result. Hand back our last resort fallback font.
170 return FontCache::fontCache()->getLastResortFallbackFont(fontDescription);
174 const FontData* FontFallbackList::fontDataAt(const FontDescription& fontDescription, unsigned realizedFontIndex) const
176 if (realizedFontIndex < m_fontList.size())
177 return m_fontList[realizedFontIndex].get(); // This fallback font is already in our list.
179 // Make sure we're not passing in some crazy value here.
180 ASSERT(realizedFontIndex == m_fontList.size());
182 if (m_familyIndex == cAllFamiliesScanned)
185 // Ask the font cache for the font data.
186 // We are obtaining this font for the first time. We keep track of the families 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::fontCache()->generation() == m_generation);
190 RefPtr<FontData> result = getFontData(fontDescription, m_familyIndex);
192 m_fontList.append(result);
193 if (result->isLoading())
194 m_loadingCustomFonts = true;