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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 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE
 * 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 {

LayoutRect BoxShape::shapeMarginLogicalBoundingBox() const
{
    FloatRect marginBounds(m_bounds.rect());
    if (shapeMargin() > 0)
        marginBounds.inflate(shapeMargin());
    return static_cast<LayoutRect>(marginBounds);
}

LayoutRect BoxShape::shapePaddingLogicalBoundingBox() const
{
    FloatRect paddingBounds(m_bounds.rect());
    if (shapePadding() > 0)
        paddingBounds.inflate(-shapePadding());
    return static_cast<LayoutRect>(paddingBounds);
}

FloatRoundedRect BoxShape::shapeMarginBounds() const
{
    FloatRoundedRect marginBounds(m_bounds);
    if (shapeMargin() > 0) {
        marginBounds.inflate(shapeMargin());
        marginBounds.expandRadii(shapeMargin());
    }
    return marginBounds;
}

FloatRoundedRect BoxShape::shapePaddingBounds() const
{
    FloatRoundedRect paddingBounds(m_bounds);
    if (shapePadding() > 0) {
        paddingBounds.inflate(-shapePadding());
        paddingBounds.expandRadii(-shapePadding());
    }
    return paddingBounds;
}

void BoxShape::getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList& result) const
{
    const FloatRoundedRect& marginBounds = shapeMarginBounds();
    if (marginBounds.isEmpty() || !lineOverlapsShapeMarginBounds(logicalTop, logicalHeight))
        return;

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

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

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

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

    if (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
{
    const FloatRoundedRect& paddingBounds = shapePaddingBounds();
    if (paddingBounds.isEmpty())
        return;

    const FloatRect& rect = 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