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
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * 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; }

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