Source/core/rendering/shapes/ShapeInfo.cpp

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
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 * modification, are permitted provided that the following conditions
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#include "config.h"
#include "core/rendering/shapes/ShapeInfo.h"

#include "core/rendering/RenderRegion.h"
#include "core/rendering/shapes/Shape.h"
#include "core/rendering/style/RenderStyle.h"

namespace WebCore {
template<class RenderType, ShapeValue* (RenderStyle::*shapeGetter)() const, void (Shape::*intervalGetter)(LayoutUnit, LayoutUnit, SegmentList&) const>
const Shape* ShapeInfo<RenderType, shapeGetter, intervalGetter>::computedShape() const
{
    if (Shape* shape = m_shape.get())
        return shape;

    ShapeValue* shapeValue = (m_renderer->style()->*shapeGetter)();
    BasicShape* shape = (shapeValue && shapeValue->type() == ShapeValue::Shape) ? shapeValue->shape() : 0;

    ASSERT(shape);

    m_shape = Shape::createShape(shape, LayoutSize(m_shapeLogicalWidth, m_shapeLogicalHeight), m_renderer->style()->writingMode(), m_renderer->style()->shapeMargin(), m_renderer->style()->shapePadding());
    ASSERT(m_shape);
    return m_shape.get();
}

template<class RenderType, ShapeValue* (RenderStyle::*shapeGetter)() const, void (Shape::*intervalGetter)(LayoutUnit, LayoutUnit, SegmentList&) const>
LayoutUnit ShapeInfo<RenderType, shapeGetter, intervalGetter>::logicalTopOffset() const
{
    LayoutUnit logicalTopOffset = m_renderer->style()->boxSizing() == CONTENT_BOX ? m_renderer->borderBefore() + m_renderer->paddingBefore() : LayoutUnit();
    // Content in a flow thread is relative to the beginning of the thread, but the shape calculation should be relative to the current region.
    if (m_renderer->isRenderRegion())
        logicalTopOffset += toRenderRegion(m_renderer)->logicalTopForFlowThreadContent();
    return logicalTopOffset;
}

template<class RenderType, ShapeValue* (RenderStyle::*shapeGetter)() const, void (Shape::*intervalGetter)(LayoutUnit, LayoutUnit, SegmentList&) const>
bool ShapeInfo<RenderType, shapeGetter, intervalGetter>::computeSegmentsForLine(LayoutUnit lineTop, LayoutUnit lineHeight)
{
    ASSERT(lineHeight >= 0);
    m_shapeLineTop = lineTop - logicalTopOffset();
    m_lineHeight = lineHeight;
    m_segments.clear();

    if (lineOverlapsShapeBounds())
        (computedShape()->*intervalGetter)(m_shapeLineTop, std::min(m_lineHeight, shapeLogicalBottom() - lineTop), m_segments);

    LayoutUnit logicalLeftOffset = this->logicalLeftOffset();
    for (size_t i = 0; i < m_segments.size(); i++) {
        m_segments[i].logicalLeft += logicalLeftOffset;
        m_segments[i].logicalRight += logicalLeftOffset;
    }

    return m_segments.size();
}

template class ShapeInfo<RenderBlock, &RenderStyle::resolvedShapeInside, &Shape::getIncludedIntervals>;
template class ShapeInfo<RenderBox, &RenderStyle::shapeOutside, &Shape::getExcludedIntervals>;
}