1 /*
2 * Copyright (C) 2008, 2009 Apple 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #ifndef SegmentedFontData_h
27 #define SegmentedFontData_h
28
29 #include "platform/PlatformExport.h"
30 #include "platform/fonts/FontData.h"
31 #include "wtf/Vector.h"
32
33 namespace WebCore {
34
35 class SimpleFontData;
36
37 struct FontDataRange {
FontDataRangeFontDataRange38 FontDataRange(UChar32 from, UChar32 to, PassRefPtr<SimpleFontData> fontData)
39 : m_from(from)
40 , m_to(to)
41 , m_fontData(fontData)
42 {
43 }
44
fromFontDataRange45 UChar32 from() const { return m_from; }
toFontDataRange46 UChar32 to() const { return m_to; }
isEntireRangeFontDataRange47 bool isEntireRange() const { return !m_from && m_to >= 0x10ffff; }
fontDataFontDataRange48 PassRefPtr<SimpleFontData> fontData() const { return m_fontData; }
49
50 private:
51 UChar32 m_from;
52 UChar32 m_to;
53 RefPtr<SimpleFontData> m_fontData;
54 };
55
56 class PLATFORM_EXPORT SegmentedFontData : public FontData {
57 public:
create()58 static PassRefPtr<SegmentedFontData> create() { return adoptRef(new SegmentedFontData); }
59
60 virtual ~SegmentedFontData();
61
appendRange(const FontDataRange & range)62 void appendRange(const FontDataRange& range) { m_ranges.append(range); }
numRanges()63 unsigned numRanges() const { return m_ranges.size(); }
rangeAt(unsigned i)64 const FontDataRange& rangeAt(unsigned i) const { return m_ranges[i]; }
65
66 #ifndef NDEBUG
67 virtual String description() const;
68 #endif
69
70 private:
SegmentedFontData()71 SegmentedFontData() { }
72
73 virtual const SimpleFontData* fontDataForCharacter(UChar32) const OVERRIDE;
74 virtual bool containsCharacters(const UChar*, int length) const OVERRIDE;
75
76 virtual bool isCustomFont() const OVERRIDE;
77 virtual bool isLoading() const OVERRIDE;
78 virtual bool isLoadingFallback() const OVERRIDE;
79 virtual bool isSegmented() const OVERRIDE;
80
81 bool containsCharacter(UChar32) const;
82
83 Vector<FontDataRange, 1> m_ranges;
84 };
85
toSegmentedFontData(FontData * fontData)86 inline SegmentedFontData* toSegmentedFontData(FontData* fontData)
87 {
88 ASSERT_WITH_SECURITY_IMPLICATION(!fontData || fontData->isSegmented());
89 return static_cast<SegmentedFontData*>(fontData);
90 }
91
92 } // namespace WebCore
93
94 #endif // SegmentedFontData_h
95