third_party/WebKit/Source/platform/geometry/IntRectOutsets.h

   1 /*
   2  * Copyright (C) 2013 Adobe Systems Incorporated. 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  *
   8  * 1. Redistributions of source code must retain the above
   9  *    copyright notice, this list of conditions and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above
  12  *    copyright notice, this list of conditions and the following
  13  *    disclaimer in the documentation and/or other materials
  14  *    provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  21  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  25  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef IntRectOutsets_h
  31 #define IntRectOutsets_h
  32
  33 #include "platform/PlatformExport.h"
  34
  35 namespace blink {
  36
  37 // Specifies integral lengths to be used to expand a rectangle.
  38 // For example, |top()| returns the distance the top edge should be moved
  39 // upward.
  40 //
  41 // Negative lengths can be used to express insets.
  42 class PLATFORM_EXPORT IntRectOutsets {
  43 public:
  44     IntRectOutsets()
  45         : m_top(0)
  46         , m_right(0)
  47         , m_bottom(0)
  48         , m_left(0)
  49     {
  50     }
  51
  52     IntRectOutsets(int top, int right, int bottom, int left)
  53         : m_top(top)
  54         , m_right(right)
  55         , m_bottom(bottom)
  56         , m_left(left)
  57     {
  58     }
  59
  60     int top() const { return m_top; }
  61     int right() const { return m_right; }
  62     int bottom() const { return m_bottom; }
  63     int left() const { return m_left; }
  64
  65     void setTop(int top) { m_top = top; }
  66     void setRight(int right) { m_right = right; }
  67     void setBottom(int bottom) { m_bottom = bottom; }
  68     void setLeft(int left) { m_left = left; }
  69
  70     bool isZero() const { return !left() && !right() && !top() && !bottom(); }
  71
  72 private:
  73     int m_top;
  74     int m_right;
  75     int m_bottom;
  76     int m_left;
  77 };
  78
  79 inline void operator+=(IntRectOutsets& a, const IntRectOutsets& b)
  80 {
  81     a.setTop(a.top() + b.top());
  82     a.setRight(a.right() + b.right());
  83     a.setBottom(a.bottom() + b.bottom());
  84     a.setLeft(a.left() + b.left());
  85 }
  86
  87 } // namespace blink
  88
  89 #endif // IntRectOutsets_h