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      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 {
     38     FontDataRange(UChar32 from, UChar32 to, PassRefPtr<SimpleFontData> fontData)
     39         : m_from(from)
     40         , m_to(to)
     41         , m_fontData(fontData)
     42     {
     43     }
     44 
     45     UChar32 from() const { return m_from; }
     46     UChar32 to() const { return m_to; }
     47     bool isEntireRange() const { return !m_from && m_to >= 0x10ffff; }
     48     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:
     58     static PassRefPtr<SegmentedFontData> create() { return adoptRef(new SegmentedFontData); }
     59 
     60     virtual ~SegmentedFontData();
     61 
     62     void appendRange(const FontDataRange& range) { m_ranges.append(range); }
     63     unsigned numRanges() const { return m_ranges.size(); }
     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:
     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 
     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