third_party/WebKit/Source/core/layout/ClipRect.h

   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 ClipRect_h
  27 #define ClipRect_h
  28
  29 #include "platform/geometry/LayoutRect.h"
  30 #include "wtf/FastAllocBase.h"
  31
  32 namespace blink {
  33
  34 class HitTestLocation;
  35
  36 class ClipRect {
  37     WTF_MAKE_FAST_ALLOCATED(ClipRect);
  38 public:
  39     ClipRect()
  40         : m_hasRadius(false)
  41         , m_isClippedByClipCss(false)
  42     { }
  43
  44     ClipRect(const LayoutRect& rect)
  45         : m_rect(rect)
  46         , m_hasRadius(false)
  47         , m_isClippedByClipCss(false)
  48     { }
  49
  50     const LayoutRect& rect() const { return m_rect; }
  51
  52     bool hasRadius() const { return m_hasRadius; }
  53     void setHasRadius(bool hasRadius) { m_hasRadius = hasRadius; }
  54
  55     bool operator==(const ClipRect& other) const { return rect() == other.rect() && hasRadius() == other.hasRadius(); }
  56     bool operator!=(const ClipRect& other) const { return rect() != other.rect() || hasRadius() != other.hasRadius(); }
  57     bool operator!=(const LayoutRect& otherRect) const { return rect() != otherRect; }
  58
  59     void intersect(const LayoutRect& other) { m_rect.intersect(other); }
  60     void intersect(const ClipRect& other)
  61     {
  62         m_rect.intersect(other.rect());
  63         if (other.hasRadius())
  64             m_hasRadius = true;
  65     }
  66     void move(const LayoutSize& size) { m_rect.move(size); }
  67     void move(const IntSize& size) { m_rect.move(size); }
  68     void moveBy(const LayoutPoint& point) { m_rect.moveBy(point); }
  69
  70     bool isEmpty() const { return m_rect.isEmpty(); }
  71     bool intersects(const HitTestLocation&) const;
  72
  73     // These have no semantic use. They are used for use-counting.
  74     bool isClippedByClipCss() const { return m_isClippedByClipCss; }
  75     ClipRect& setIsClippedByClipCss() { m_isClippedByClipCss = true; return *this; }
  76
  77 private:
  78     LayoutRect m_rect;
  79     bool m_hasRadius;
  80     bool m_isClippedByClipCss;
  81 };
  82
  83 inline ClipRect intersection(const ClipRect& a, const ClipRect& b)
  84 {
  85     ClipRect c = a;
  86     c.intersect(b);
  87     return c;
  88 }
  89
  90 } // namespace blink
  91
  92 #endif // ClipRect_h