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 "FontFallbackList.h"
31
32 #include "Font.h"
33 #include "FontCache.h"
34 #include "SegmentedFontData.h"
35
36 namespace WebCore {
37
FontFallbackList()38 FontFallbackList::FontFallbackList()
39 : m_pageZero(0)
40 , m_cachedPrimarySimpleFontData(0)
41 , m_fontSelector(0)
42 , m_familyIndex(0)
43 , m_pitch(UnknownPitch)
44 , m_loadingCustomFonts(false)
45 , m_generation(fontCache()->generation())
46 {
47 }
48
invalidate(PassRefPtr<FontSelector> fontSelector)49 void FontFallbackList::invalidate(PassRefPtr<FontSelector> fontSelector)
50 {
51 releaseFontData();
52 m_fontList.clear();
53 m_pageZero = 0;
54 m_pages.clear();
55 m_cachedPrimarySimpleFontData = 0;
56 m_familyIndex = 0;
57 m_pitch = UnknownPitch;
58 m_loadingCustomFonts = false;
59 m_fontSelector = fontSelector;
60 m_generation = fontCache()->generation();
61 }
62
releaseFontData()63 void FontFallbackList::releaseFontData()
64 {
65 unsigned numFonts = m_fontList.size();
66 for (unsigned i = 0; i < numFonts; ++i) {
67 if (!m_fontList[i].second) {
68 ASSERT(!m_fontList[i].first->isSegmented());
69 fontCache()->releaseFontData(static_cast<const SimpleFontData*>(m_fontList[i].first));
70 }
71 }
72 }
73
determinePitch(const Font * font) const74 void FontFallbackList::determinePitch(const Font* font) const
75 {
76 const FontData* fontData = primaryFontData(font);
77 if (!fontData->isSegmented())
78 m_pitch = static_cast<const SimpleFontData*>(fontData)->pitch();
79 else {
80 const SegmentedFontData* segmentedFontData = static_cast<const SegmentedFontData*>(fontData);
81 unsigned numRanges = segmentedFontData->numRanges();
82 if (numRanges == 1)
83 m_pitch = segmentedFontData->rangeAt(0).fontData()->pitch();
84 else
85 m_pitch = VariablePitch;
86 }
87 }
88
fontDataAt(const Font * font,unsigned realizedFontIndex) const89 const FontData* FontFallbackList::fontDataAt(const Font* font, unsigned realizedFontIndex) const
90 {
91 if (realizedFontIndex < m_fontList.size())
92 return m_fontList[realizedFontIndex].first; // This fallback font is already in our list.
93
94 // Make sure we're not passing in some crazy value here.
95 ASSERT(realizedFontIndex == m_fontList.size());
96
97 if (m_familyIndex == cAllFamiliesScanned)
98 return 0;
99
100 // Ask the font cache for the font data.
101 // We are obtaining this font for the first time. We keep track of the families we've looked at before
102 // in |m_familyIndex|, so that we never scan the same spot in the list twice. getFontData will adjust our
103 // |m_familyIndex| as it scans for the right font to make.
104 ASSERT(fontCache()->generation() == m_generation);
105 const FontData* result = fontCache()->getFontData(*font, m_familyIndex, m_fontSelector.get());
106 if (result) {
107 m_fontList.append(pair<const FontData*, bool>(result, result->isCustomFont()));
108 if (result->isLoading())
109 m_loadingCustomFonts = true;
110 }
111 return result;
112 }
113
setPlatformFont(const FontPlatformData & platformData)114 void FontFallbackList::setPlatformFont(const FontPlatformData& platformData)
115 {
116 m_familyIndex = cAllFamiliesScanned;
117 ASSERT(fontCache()->generation() == m_generation);
118 const FontData* fontData = fontCache()->getCachedFontData(&platformData);
119 m_fontList.append(pair<const FontData*, bool>(fontData, fontData->isCustomFont()));
120 }
121
122 }
123