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      1 /*
      2  * Copyright (C) 2007 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 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 LayoutState_h
     27 #define LayoutState_h
     28 
     29 #include "IntRect.h"
     30 #include "IntSize.h"
     31 #include <wtf/Noncopyable.h>
     32 
     33 namespace WebCore {
     34 
     35 class RenderArena;
     36 class RenderBox;
     37 class RenderObject;
     38 
     39 class LayoutState : public Noncopyable {
     40 public:
     41     LayoutState()
     42         : m_clipped(false)
     43         , m_next(0)
     44 #ifndef NDEBUG
     45         , m_renderer(0)
     46 #endif
     47     {
     48     }
     49 
     50     LayoutState(LayoutState*, RenderBox*, const IntSize& offset);
     51     LayoutState(RenderObject*);
     52 
     53     void destroy(RenderArena*);
     54 
     55     // Overloaded new operator.
     56     void* operator new(size_t, RenderArena*) throw();
     57 
     58     // Overridden to prevent the normal delete from being called.
     59     void operator delete(void*, size_t);
     60 
     61 private:
     62     // The normal operator new is disallowed.
     63     void* operator new(size_t) throw();
     64 
     65 public:
     66     bool m_clipped;
     67     IntRect m_clipRect;
     68     IntSize m_offset;       // x/y offset from container.
     69     IntSize m_layoutDelta;  // Transient offset from the final position of the object
     70                             // used to ensure that repaints happen in the correct place.
     71                             // This is a total delta accumulated from the root.
     72     LayoutState* m_next;
     73 #ifndef NDEBUG
     74     RenderObject* m_renderer;
     75 #endif
     76 };
     77 
     78 } // namespace WebCore
     79 
     80 #endif // LayoutState_h
     81