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      1 /*
      2  * Copyright (C) 2003, 2009, 2012 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 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 ClipRects_h
     27 #define ClipRects_h
     28 
     29 #include "core/rendering/ClipRect.h"
     30 
     31 namespace blink {
     32 
     33 class ClipRects {
     34     WTF_MAKE_FAST_ALLOCATED;
     35 public:
     36     static PassRefPtr<ClipRects> create()
     37     {
     38         return adoptRef(new ClipRects);
     39     }
     40 
     41     static PassRefPtr<ClipRects> create(const ClipRects& other)
     42     {
     43         return adoptRef(new ClipRects(other));
     44     }
     45 
     46     ClipRects()
     47         : m_refCnt(1)
     48         , m_fixed(0)
     49     {
     50     }
     51 
     52     void reset(const LayoutRect& r)
     53     {
     54         m_overflowClipRect = r;
     55         m_fixedClipRect = r;
     56         m_posClipRect = r;
     57         m_fixed = 0;
     58     }
     59 
     60     const ClipRect& overflowClipRect() const { return m_overflowClipRect; }
     61     void setOverflowClipRect(const ClipRect& r) { m_overflowClipRect = r; }
     62 
     63     const ClipRect& fixedClipRect() const { return m_fixedClipRect; }
     64     void setFixedClipRect(const ClipRect&r) { m_fixedClipRect = r; }
     65 
     66     const ClipRect& posClipRect() const { return m_posClipRect; }
     67     void setPosClipRect(const ClipRect& r) { m_posClipRect = r; }
     68 
     69     bool fixed() const { return static_cast<bool>(m_fixed); }
     70     void setFixed(bool fixed) { m_fixed = fixed ? 1 : 0; }
     71 
     72     void ref() { m_refCnt++; }
     73     void deref()
     74     {
     75         if (!--m_refCnt)
     76             delete this;
     77     }
     78 
     79     bool operator==(const ClipRects& other) const
     80     {
     81         return m_overflowClipRect == other.overflowClipRect()
     82             && m_fixedClipRect == other.fixedClipRect()
     83             && m_posClipRect == other.posClipRect()
     84             && fixed() == other.fixed();
     85     }
     86 
     87     ClipRects& operator=(const ClipRects& other)
     88     {
     89         m_overflowClipRect = other.overflowClipRect();
     90         m_fixedClipRect = other.fixedClipRect();
     91         m_posClipRect = other.posClipRect();
     92         m_fixed = other.fixed();
     93         return *this;
     94     }
     95 
     96 private:
     97     ClipRects(const LayoutRect& r)
     98         : m_overflowClipRect(r)
     99         , m_fixedClipRect(r)
    100         , m_posClipRect(r)
    101         , m_refCnt(1)
    102         , m_fixed(0)
    103     {
    104     }
    105 
    106     ClipRects(const ClipRects& other)
    107         : m_overflowClipRect(other.overflowClipRect())
    108         , m_fixedClipRect(other.fixedClipRect())
    109         , m_posClipRect(other.posClipRect())
    110         , m_refCnt(1)
    111         , m_fixed(other.fixed())
    112     {
    113     }
    114 
    115     ClipRect m_overflowClipRect;
    116     ClipRect m_fixedClipRect;
    117     ClipRect m_posClipRect;
    118     unsigned m_refCnt : 31;
    119     unsigned m_fixed : 1;
    120 };
    121 
    122 } // namespace blink
    123 
    124 #endif // ClipRects_h
    125