Source/core/rendering/shapes/ShapeInfo.cpp

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. 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 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,
 * 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.
 */

#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;

    const LayoutSize logicalBoxSize(m_shapeLogicalWidth, m_shapeLogicalHeight);
    WritingMode writingMode = m_renderer->style()->writingMode();
    Length margin = m_renderer->style()->shapeMargin();
    Length padding = m_renderer->style()->shapePadding();
    const ShapeValue* shapeValue = (m_renderer->style()->*shapeGetter)();
    ASSERT(shapeValue);

    switch (shapeValue->type()) {
    case ShapeValue::Shape:
        ASSERT(shapeValue->shape());
        m_shape = Shape::createShape(shapeValue->shape(), logicalBoxSize, writingMode, margin, padding);
        break;
    case ShapeValue::Image:
        ASSERT(shapeValue->image());
        m_shape = Shape::createShape(shapeValue->image(), 0, logicalBoxSize, writingMode, margin, padding);
        break;
    default:
        ASSERT_NOT_REACHED();
    }

    ASSERT(m_shape);
    return m_shape.get();
}

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>;
}