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

/*
 * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ClipRect_h
#define ClipRect_h

#include "platform/geometry/LayoutRect.h"
#include "wtf/Allocator.h"

namespace blink {

class HitTestLocation;

class ClipRect {
  USING_FAST_MALLOC(ClipRect);

 public:
  ClipRect() : m_hasRadius(false), m_isClippedByClipCss(false) {}

  ClipRect(const LayoutRect& rect)
      : m_rect(rect), m_hasRadius(false), m_isClippedByClipCss(false) {}

  const LayoutRect& rect() const { return m_rect; }

  bool hasRadius() const { return m_hasRadius; }
  void setHasRadius(bool hasRadius) { m_hasRadius = hasRadius; }

  bool operator==(const ClipRect& other) const {
    return rect() == other.rect() && hasRadius() == other.hasRadius();
  }
  bool operator!=(const ClipRect& other) const {
    return rect() != other.rect() || hasRadius() != other.hasRadius();
  }
  bool operator!=(const LayoutRect& otherRect) const {
    return rect() != otherRect;
  }

  void intersect(const LayoutRect& other) { m_rect.intersect(other); }
  void intersect(const ClipRect& other) {
    m_rect.intersect(other.rect());
    if (other.hasRadius())
      m_hasRadius = true;
  }
  void move(const LayoutSize& size) { m_rect.move(size); }
  void move(const IntSize& size) { m_rect.move(size); }
  void moveBy(const LayoutPoint& point) { m_rect.moveBy(point); }

  bool isEmpty() const { return m_rect.isEmpty(); }
  bool intersects(const HitTestLocation&) const;

  // These have no semantic use. They are used for use-counting.
  bool isClippedByClipCss() const { return m_isClippedByClipCss; }
  ClipRect& setIsClippedByClipCss() {
    m_isClippedByClipCss = true;
    return *this;
  }

  String toString() const { return m_rect.toString(); }

 private:
  LayoutRect m_rect;
  bool m_hasRadius;
  bool m_isClippedByClipCss;
};

inline ClipRect intersection(const ClipRect& a, const ClipRect& b) {
  ClipRect c = a;
  c.intersect(b);
  return c;
}

}  // namespace blink

#endif  // ClipRect_h