Source/core/rendering/shapes/BoxShape.cpp

/*
 * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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#include "config.h"
#include "core/rendering/shapes/BoxShape.h"

#include "wtf/MathExtras.h"

namespace WebCore {

BoxShape::BoxShape(const FloatRoundedRect& bounds, float shapeMargin, float shapePadding)
    : Shape()
    , m_bounds(bounds)
    , m_marginBounds(bounds)
    , m_paddingBounds(bounds)
{
    if (shapeMargin > 0) {
        m_marginBounds.inflate(shapeMargin);
        m_marginBounds.expandRadii(shapeMargin);
    }
    if (shapePadding > 0) {
        m_paddingBounds.inflate(-shapePadding);
        m_paddingBounds.expandRadii(-shapePadding);
    }
}

void BoxShape::getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList& result) const
{
    if (m_marginBounds.isEmpty())
        return;

    float y1 = logicalTop;
    float y2 = logicalTop + logicalHeight;
    const FloatRect& rect = m_marginBounds.rect();

    if (y2 <= rect.y() || y1 >= rect.maxY())
        return;

    if (!m_marginBounds.isRounded()) {
        result.append(LineSegment(m_marginBounds.rect().x(), m_marginBounds.rect().maxX()));
        return;
    }

    float x1 = rect.maxX();
    float x2 = rect.x();
    float minXIntercept;
    float maxXIntercept;

    if (m_marginBounds.xInterceptsAtY(y1, minXIntercept, maxXIntercept)) {
        x1 = std::min<float>(x1, minXIntercept);
        x2 = std::max<float>(x2, maxXIntercept);
    }

    if (m_marginBounds.xInterceptsAtY(y2, minXIntercept, maxXIntercept)) {
        x1 = std::min<float>(x1, minXIntercept);
        x2 = std::max<float>(x2, maxXIntercept);
    }

    ASSERT(x2 >= x1);
    result.append(LineSegment(x1, x2));
}

void BoxShape::getIncludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList& result) const
{
    if (m_paddingBounds.isEmpty())
        return;

    const FloatRect& rect = m_paddingBounds.rect();
    if (logicalTop < rect.y() || logicalTop + logicalHeight > rect.maxY())
        return;

    // FIXME: this method is only a stub, https://bugs.webkit.org/show_bug.cgi?id=124605.

    result.append(LineSegment(rect.x(), rect.maxX()));
}

bool BoxShape::firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize&, LayoutUnit& result) const
{
    // FIXME: this method is only a stub, https://bugs.webkit.org/show_bug.cgi?id=124606.

    result = minLogicalIntervalTop;
    return true;
}

} // namespace WebCore