Source/core/rendering/shapes/ShapeOutsideInfo.cpp

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
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 *    disclaimer.
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 *    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 THE COPYRIGHT HOLDER “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 BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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#include "config.h"
#include "core/rendering/shapes/ShapeOutsideInfo.h"

#include "core/rendering/FloatingObjects.h"
#include "core/rendering/RenderBlockFlow.h"
#include "core/rendering/RenderBox.h"

namespace WebCore {
bool ShapeOutsideInfo::isEnabledFor(const RenderBox* box)
{
    ShapeValue* shapeValue = box->style()->shapeOutside();
    if (!box->isFloating() || !shapeValue)
        return false;

    switch (shapeValue->type()) {
    case ShapeValue::Shape:
        return shapeValue->shape();
    case ShapeValue::Image:
        return shapeValue->isImageValid() && checkShapeImageOrigin(box->document(), *(shapeValue->image()->cachedImage()));
    case ShapeValue::Box:
        return true;
    case ShapeValue::Outside:
        return false;
    }

    return false;
}

void ShapeOutsideInfo::updateDeltasForContainingBlockLine(const RenderBlockFlow* containingBlock, const FloatingObject* floatingObject, LayoutUnit lineTop, LayoutUnit lineHeight)
{
    LayoutUnit shapeTop = containingBlock->logicalTopForFloat(floatingObject) + std::max(LayoutUnit(), containingBlock->marginBeforeForChild(m_renderer));
    LayoutUnit floatRelativeLineTop = lineTop - shapeTop;

    if (shapeSizeDirty() || m_lineTop != floatRelativeLineTop || m_lineHeight != lineHeight) {
        m_lineTop = floatRelativeLineTop;
        m_shapeLineTop = floatRelativeLineTop - logicalTopOffset();
        m_lineHeight = lineHeight;

        LayoutUnit floatMarginBoxWidth = containingBlock->logicalWidthForFloat(floatingObject);

        if (lineOverlapsShapeBounds()) {
            SegmentList segments = computeSegmentsForLine(floatRelativeLineTop, lineHeight);
            if (segments.size()) {
                LayoutUnit rawLeftMarginBoxDelta = segments.first().logicalLeft + containingBlock->marginStartForChild(m_renderer);
                m_leftMarginBoxDelta = clampTo<LayoutUnit>(rawLeftMarginBoxDelta, LayoutUnit(), floatMarginBoxWidth);

                LayoutUnit rawRightMarginBoxDelta = segments.last().logicalRight - containingBlock->logicalWidthForChild(m_renderer) - containingBlock->marginEndForChild(m_renderer);
                m_rightMarginBoxDelta = clampTo<LayoutUnit>(rawRightMarginBoxDelta, -floatMarginBoxWidth, LayoutUnit());
                return;
            }
        }

        // Lines that do not overlap the shape should act as if the float
        // wasn't there for layout purposes. So we set the deltas to remove the
        // entire width of the float.
        // FIXME: The latest CSS Shapes spec says that in this case, the
        // content should interact with previously stacked floats on the line
        // as if this outermost float did not exist. Perhaps obviously, this
        // solution cannot do that, and will be revisted when that part of the
        // spec is implemented.
        m_leftMarginBoxDelta = floatMarginBoxWidth;
        m_rightMarginBoxDelta = -floatMarginBoxWidth;
    }
}

ShapeValue* ShapeOutsideInfo::shapeValue() const
{
    return m_renderer->style()->shapeOutside();
}

}